Whoops, forgot to put something back that i took out during testing!

[user/henk/code/inspircd.git] / src / modules / m_spanningtree.cpp

/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
 * See: http://www.inspircd.org/wiki/index.php/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

/* $ModDesc: Povides a spanning tree server link protocol */

#include "configreader.h"
#include "users.h"
#include "channels.h"
#include "modules.h"
#include "commands/cmd_whois.h"
#include "commands/cmd_stats.h"
#include "socket.h"
#include "inspircd.h"
#include "wildcard.h"
#include "xline.h"
#include "transport.h"

/** If you make a change which breaks the protocol, increment this.
 * If you  completely change the protocol, completely change the number.
 *
 * IMPORTANT: If you make changes, document your changes here, without fail:
 * http://www.inspircd.org/wiki/List_of_protocol_changes_between_versions
 *
 * Failure to document your protocol changes will result in a painfully
 * painful death by pain. You have been warned.
 */
const long ProtocolVersion = 1103;

/*
 * The server list in InspIRCd is maintained as two structures
 * which hold the data in different ways. Most of the time, we
 * want to very quicky obtain three pieces of information:
 *
 * (1) The information on a server
 * (2) The information on the server we must send data through
 *     to actually REACH the server we're after
 * (3) Potentially, the child/parent objects of this server
 *
 * The InspIRCd spanning protocol provides easy access to these
 * by storing the data firstly in a recursive structure, where
 * each item references its parent item, and a dynamic list
 * of child items, and another structure which stores the items
 * hashed, linearly. This means that if we want to find a server
 * by name quickly, we can look it up in the hash, avoiding
 * any O(n) lookups. If however, during a split or sync, we want
 * to apply an operation to a server, and any of its child objects
 * we can resort to recursion to walk the tree structure.
 * Any socket can have one of five states at any one time.
 * The LISTENER state indicates a socket which is listening
 * for connections. It cannot receive data itself, only incoming
 * sockets.
 * The CONNECTING state indicates an outbound socket which is
 * waiting to be writeable.
 * The WAIT_AUTH_1 state indicates the socket is outbound and
 * has successfully connected, but has not yet sent and received
 * SERVER strings.
 * The WAIT_AUTH_2 state indicates that the socket is inbound
 * (allocated by a LISTENER) but has not yet sent and received
 * SERVER strings.
 * The CONNECTED state represents a fully authorized, fully
 * connected server.
 */
enum ServerState { LISTENER, CONNECTING, WAIT_AUTH_1, WAIT_AUTH_2, CONNECTED };

/* Foward declarations */
class TreeServer;
class TreeSocket;
class Link;
class ModuleSpanningTree;
class SpanningTreeUtilities;

/* This hash_map holds the hash equivalent of the server
 * tree, used for rapid linear lookups.
 */
typedef nspace::hash_map<std::string, TreeServer*, nspace::hash<string>, irc::StrHashComp> server_hash;

typedef std::map<TreeServer*,TreeServer*> TreeServerList;

/** A group of modules that implement InspSocketHook
 * that we can use to hook our server to server connections.
 */
typedef std::map<irc::string, Module*> hookmodules;

/** The Link class might as well be a struct,
 * but this is C++ and we don't believe in structs (!).
 * It holds the entire information of one <link>
 * tag from the main config file. We maintain a list
 * of them, and populate the list on rehash/load.
 */
class Link : public classbase
{
 public:
        irc::string Name;
        std::string IPAddr;
        int Port;
        std::string SendPass;
        std::string RecvPass;
        unsigned long AutoConnect;
        time_t NextConnectTime;
        bool HiddenFromStats;
        std::string FailOver;
        std::string Hook;
        int Timeout;
};

class HandshakeTimer : public InspTimer
{
 private:
        InspIRCd* Instance;
        TreeSocket* sock;
        Link* lnk;
        SpanningTreeUtilities* Utils;
        int thefd;
 public:
        HandshakeTimer(InspIRCd* Inst, TreeSocket* s, Link* l, SpanningTreeUtilities* u);
        virtual void Tick(time_t TIME);
};


/** Contains helper functions and variables for this module,
 * and keeps them out of the global namespace
 */
class SpanningTreeUtilities
{
 private:
        /** Creator server
         */
        InspIRCd* ServerInstance;
 public:
        /** Creator module
         */
        ModuleSpanningTree* Creator;
        /** Flatten links and /MAP for non-opers
         */
        bool FlatLinks;
        /** Hide U-Lined servers in /MAP and /LINKS
         */
        bool HideULines;
        /** Announce TS changes to channels on merge
         */
        bool AnnounceTSChange;
        /** Synchronize timestamps between servers
         */
        bool EnableTimeSync;
        /** Socket bindings for listening sockets
         */
        std::vector<TreeSocket*> Bindings;
        /** This variable represents the root of the server tree
         */
        TreeServer *TreeRoot;
        /** IPs allowed to link to us
         */
        std::vector<std::string> ValidIPs;
        /** Hash of currently connected servers by name
         */
        server_hash serverlist;
        /** Holds the data from the <link> tags in the conf
         */
        std::vector<Link> LinkBlocks;

        hookmodules hooks;
        std::vector<std::string> hooknames;

        /** Initialise utility class
         */
        SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* Creator);
        /** Destroy class and free listeners etc
         */
        ~SpanningTreeUtilities();
        /** Send a message from this server to one other local or remote
         */
        bool DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target);
        /** Send a message from this server to all but one other, local or remote
         */
        bool DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit);
        /** Send a message from this server to all but one other, local or remote
         */
        bool DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit);
        /** Send a message from this server to all others
         */
        bool DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params);
        /** Send a message from this server to all others
         */
        bool DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params);
        /** Send a message from this server to all others, without doing any processing on the command (e.g. send it as-is with colons and all)
         */
        bool DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params);
        /** Read the spanningtree module's tags from the config file
         */
        void ReadConfiguration(bool rebind);
        /** Add a server to the server list for GetListOfServersForChannel
         */
        void AddThisServer(TreeServer* server, TreeServerList &list);
        /** Compile a list of servers which contain members of channel c
         */
        void GetListOfServersForChannel(chanrec* c, TreeServerList &list, char status, const CUList &exempt_list);
        /** Find a server by name
         */
        TreeServer* FindServer(const std::string &ServerName);
        /** Find a route to a server by name
         */
        TreeServer* BestRouteTo(const std::string &ServerName);
        /** Find a server by glob mask
         */
        TreeServer* FindServerMask(const std::string &ServerName);
        /** Returns true if this is a server name we recognise
         */
        bool IsServer(const std::string &ServerName);
        /** Attempt to connect to the failover link of link x
         */
        void DoFailOver(Link* x);
        /** Find a link tag from a server name
         */
        Link* FindLink(const std::string& name);
};


/** Each server in the tree is represented by one class of
 * type TreeServer. A locally connected TreeServer can
 * have a class of type TreeSocket associated with it, for
 * remote servers, the TreeSocket entry will be NULL.
 * Each server also maintains a pointer to its parent
 * (NULL if this server is ours, at the top of the tree)
 * and a pointer to its "Route" (see the comments in the
 * constructors below), and also a dynamic list of pointers
 * to its children which can be iterated recursively
 * if required. Creating or deleting objects of type
 i* TreeServer automatically maintains the hash_map of
 * TreeServer items, deleting and inserting them as they
 * are created and destroyed.
 */
class TreeServer : public classbase
{
        InspIRCd* ServerInstance;               /* Creator */
        TreeServer* Parent;                     /* Parent entry */
        TreeServer* Route;                      /* Route entry */
        std::vector<TreeServer*> Children;      /* List of child objects */
        irc::string ServerName;                 /* Server's name */
        std::string ServerDesc;                 /* Server's description */
        std::string VersionString;              /* Version string or empty string */
        int UserCount;                          /* Not used in this version */
        int OperCount;                          /* Not used in this version */
        TreeSocket* Socket;                     /* For directly connected servers this points at the socket object */
        time_t NextPing;                        /* After this time, the server should be PINGed*/
        bool LastPingWasGood;                   /* True if the server responded to the last PING with a PONG */
        SpanningTreeUtilities* Utils;           /* Utility class */
        
 public:

        /** We don't use this constructor. Its a dummy, and won't cause any insertion
         * of the TreeServer into the hash_map. See below for the two we DO use.
         */
        TreeServer(SpanningTreeUtilities* Util, InspIRCd* Instance) : ServerInstance(Instance), Utils(Util)
        {
                Parent = NULL;
                ServerName = "";
                ServerDesc = "";
                VersionString = "";
                UserCount = OperCount = 0;
                VersionString = ServerInstance->GetVersionString();
        }

        /** We use this constructor only to create the 'root' item, Utils->TreeRoot, which
         * represents our own server. Therefore, it has no route, no parent, and
         * no socket associated with it. Its version string is our own local version.
         */
        TreeServer(SpanningTreeUtilities* Util, InspIRCd* Instance, std::string Name, std::string Desc) : ServerInstance(Instance), ServerName(Name.c_str()), ServerDesc(Desc), Utils(Util)
        {
                Parent = NULL;
                VersionString = "";
                UserCount = ServerInstance->UserCount();
                OperCount = ServerInstance->OperCount();
                VersionString = ServerInstance->GetVersionString();
                Route = NULL;
                Socket = NULL; /* Fix by brain */
                AddHashEntry();
        }

        /** When we create a new server, we call this constructor to initialize it.
         * This constructor initializes the server's Route and Parent, and sets up
         * its ping counters so that it will be pinged one minute from now.
         */
        TreeServer(SpanningTreeUtilities* Util, InspIRCd* Instance, std::string Name, std::string Desc, TreeServer* Above, TreeSocket* Sock)
                : ServerInstance(Instance), Parent(Above), ServerName(Name.c_str()), ServerDesc(Desc), Socket(Sock), Utils(Util)
        {
                VersionString = "";
                UserCount = OperCount = 0;
                this->SetNextPingTime(time(NULL) + 60);
                this->SetPingFlag();

                /* find the 'route' for this server (e.g. the one directly connected
                 * to the local server, which we can use to reach it)
                 *
                 * In the following example, consider we have just added a TreeServer
                 * class for server G on our network, of which we are server A.
                 * To route traffic to G (marked with a *) we must send the data to
                 * B (marked with a +) so this algorithm initializes the 'Route'
                 * value to point at whichever server traffic must be routed through
                 * to get here. If we were to try this algorithm with server B,
                 * the Route pointer would point at its own object ('this').
                 *
                 *              A
                 *             / \
                 *          + B   C
                 *           / \   \
                 *          D   E   F
                 *         /         \
                 *      * G           H
                 *
                 * We only run this algorithm when a server is created, as
                 * the routes remain constant while ever the server exists, and
                 * do not need to be re-calculated.
                 */

                Route = Above;
                if (Route == Utils->TreeRoot)
                {
                        Route = this;
                }
                else
                {
                        while (this->Route->GetParent() != Utils->TreeRoot)
                        {
                                this->Route = Route->GetParent();
                        }
                }

                /* Because recursive code is slow and takes a lot of resources,
                 * we store two representations of the server tree. The first
                 * is a recursive structure where each server references its
                 * children and its parent, which is used for netbursts and
                 * netsplits to dump the whole dataset to the other server,
                 * and the second is used for very fast lookups when routing
                 * messages and is instead a hash_map, where each item can
                 * be referenced by its server name. The AddHashEntry()
                 * call below automatically inserts each TreeServer class
                 * into the hash_map as it is created. There is a similar
                 * maintainance call in the destructor to tidy up deleted
                 * servers.
                 */

                this->AddHashEntry();
        }

        int QuitUsers(const std::string &reason)
        {
                ServerInstance->Log(DEBUG,"Removing all users from server %s",this->ServerName.c_str());
                const char* reason_s = reason.c_str();
                std::vector<userrec*> time_to_die;
                for (user_hash::iterator n = ServerInstance->clientlist->begin(); n != ServerInstance->clientlist->end(); n++)
                {
                        if (!strcmp(n->second->server, this->ServerName.c_str()))
                        {
                                time_to_die.push_back(n->second);
                        }
                }
                for (std::vector<userrec*>::iterator n = time_to_die.begin(); n != time_to_die.end(); n++)
                {
                        userrec* a = (userrec*)*n;
                        ServerInstance->Log(DEBUG,"Kill %s fd=%d",a->nick,a->GetFd());
                        if (!IS_LOCAL(a))
                                userrec::QuitUser(ServerInstance,a,reason_s);
                }
                return time_to_die.size();
        }

        /** This method is used to add the structure to the
         * hash_map for linear searches. It is only called
         * by the constructors.
         */
        void AddHashEntry()
        {
                server_hash::iterator iter = Utils->serverlist.find(this->ServerName.c_str());
                if (iter == Utils->serverlist.end())
                        Utils->serverlist[this->ServerName.c_str()] = this;
        }

        /** This method removes the reference to this object
         * from the hash_map which is used for linear searches.
         * It is only called by the default destructor.
         */
        void DelHashEntry()
        {
                server_hash::iterator iter = Utils->serverlist.find(this->ServerName.c_str());
                if (iter != Utils->serverlist.end())
                        Utils->serverlist.erase(iter);
        }

        /** These accessors etc should be pretty self-
         * explanitory.
         */
        TreeServer* GetRoute()
        {
                return Route;
        }

        std::string GetName()
        {
                return ServerName.c_str();
        }

        std::string GetDesc()
        {
                return ServerDesc;
        }

        std::string GetVersion()
        {
                return VersionString;
        }

        void SetNextPingTime(time_t t)
        {
                this->NextPing = t;
                LastPingWasGood = false;
        }

        time_t NextPingTime()
        {
                return NextPing;
        }

        bool AnsweredLastPing()
        {
                return LastPingWasGood;
        }

        void SetPingFlag()
        {
                LastPingWasGood = true;
        }

        int GetUserCount()
        {
                return UserCount;
        }

        void AddUserCount()
        {
                UserCount++;
        }

        void DelUserCount()
        {
                UserCount--;
        }

        int GetOperCount()
        {
                return OperCount;
        }

        TreeSocket* GetSocket()
        {
                return Socket;
        }

        TreeServer* GetParent()
        {
                return Parent;
        }

        void SetVersion(const std::string &Version)
        {
                VersionString = Version;
        }

        unsigned int ChildCount()
        {
                return Children.size();
        }

        TreeServer* GetChild(unsigned int n)
        {
                if (n < Children.size())
                {
                        /* Make sure they  cant request
                         * an out-of-range object. After
                         * all we know what these programmer
                         * types are like *grin*.
                         */
                        return Children[n];
                }
                else
                {
                        return NULL;
                }
        }

        void AddChild(TreeServer* Child)
        {
                Children.push_back(Child);
        }

        bool DelChild(TreeServer* Child)
        {
                for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
                {
                        if (*a == Child)
                        {
                                Children.erase(a);
                                return true;
                        }
                }
                return false;
        }

        /** Removes child nodes of this node, and of that node, etc etc.
         * This is used during netsplits to automatically tidy up the
         * server tree. It is slow, we don't use it for much else.
         */
        bool Tidy()
        {
                bool stillchildren = true;
                while (stillchildren)
                {
                        stillchildren = false;
                        for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
                        {
                                TreeServer* s = (TreeServer*)*a;
                                s->Tidy();
                                Children.erase(a);
                                DELETE(s);
                                stillchildren = true;
                                break;
                        }
                }
                return true;
        }

        ~TreeServer()
        {
                /* We'd better tidy up after ourselves, eh? */
                this->DelHashEntry();
        }
};

/** Yay for fast searches!
 * This is hundreds of times faster than recursion
 * or even scanning a linked list, especially when
 * there are more than a few servers to deal with.
 * (read as: lots).
 */
TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
{
        server_hash::iterator iter;
        iter = serverlist.find(ServerName.c_str());
        if (iter != serverlist.end())
        {
                return iter->second;
        }
        else
        {
                return NULL;
        }
}

/** Returns the locally connected server we must route a
 * message through to reach server 'ServerName'. This
 * only applies to one-to-one and not one-to-many routing.
 * See the comments for the constructor of TreeServer
 * for more details.
 */
TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
{
        if (ServerName.c_str() == TreeRoot->GetName())
                return NULL;
        TreeServer* Found = FindServer(ServerName);
        if (Found)
        {
                return Found->GetRoute();
        }
        else
        {
                return NULL;
        }
}

/** Find the first server matching a given glob mask.
 * Theres no find-using-glob method of hash_map [awwww :-(]
 * so instead, we iterate over the list using an iterator
 * and match each one until we get a hit. Yes its slow,
 * deal with it.
 */
TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
{
        for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
        {
                if (match(i->first.c_str(),ServerName.c_str()))
                        return i->second;
        }
        return NULL;
}

/* A convenient wrapper that returns true if a server exists */
bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
{
        return (FindServer(ServerName) != NULL);
}


/** Handle /RCONNECT
 */
class cmd_rconnect : public command_t
{
        Module* Creator;
        SpanningTreeUtilities* Utils;
 public:
        cmd_rconnect (InspIRCd* Instance, Module* Callback, SpanningTreeUtilities* Util) : command_t(Instance, "RCONNECT", 'o', 2), Creator(Callback), Utils(Util)
        {
                this->source = "m_spanningtree.so";
                syntax = "<remote-server-mask> <target-server-mask>";
        }

        CmdResult Handle (const char** parameters, int pcnt, userrec *user)
        {
                if (IS_LOCAL(user))
                {
                        if (!Utils->FindServer(parameters[0]))
                        {
                                user->WriteServ("NOTICE %s :*** RCONNECT: Server \002%s\002 isn't connected to the network!", user->nick, parameters[0]);
                                return CMD_FAILURE;
                        }
                        
                        user->WriteServ("NOTICE %s :*** RCONNECT: Sending remote connect to \002%s\002 to connect server \002%s\002.",user->nick,parameters[0],parameters[1]);
                }
                
                /* Is this aimed at our server? */
                if (ServerInstance->MatchText(ServerInstance->Config->ServerName,parameters[0]))
                {
                        /* Yes, initiate the given connect */
                        ServerInstance->SNO->WriteToSnoMask('l',"Remote CONNECT from %s matching \002%s\002, connecting server \002%s\002",user->nick,parameters[0],parameters[1]);
                        const char* para[1];
                        para[0] = parameters[1];
                        std::string original_command = std::string("CONNECT ") + parameters[1];
                        Creator->OnPreCommand("CONNECT", para, 1, user, true, original_command);
                }
                
                return CMD_SUCCESS;
        }
};
 


/** Every SERVER connection inbound or outbound is represented by
 * an object of type TreeSocket.
 * TreeSockets, being inherited from InspSocket, can be tied into
 * the core socket engine, and we cn therefore receive activity events
 * for them, just like activex objects on speed. (yes really, that
 * is a technical term!) Each of these which relates to a locally
 * connected server is assocated with it, by hooking it onto a
 * TreeSocket class using its constructor. In this way, we can
 * maintain a list of servers, some of which are directly connected,
 * some of which are not.
 */
class TreeSocket : public InspSocket
{
        SpanningTreeUtilities* Utils;
        std::string myhost;
        std::string in_buffer;
        ServerState LinkState;
        std::string InboundServerName;
        std::string InboundDescription;
        int num_lost_users;
        int num_lost_servers;
        time_t NextPing;
        bool LastPingWasGood;
        bool bursting;
        unsigned int keylength;
        std::string ModuleList;
        std::map<std::string,std::string> CapKeys;
        Module* Hook;

 public:

        /** Because most of the I/O gubbins are encapsulated within
         * InspSocket, we just call the superclass constructor for
         * most of the action, and append a few of our own values
         * to it.
         */
        TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, Module* HookMod = NULL)
                : InspSocket(SI, host, port, listening, maxtime), Utils(Util), Hook(HookMod)
        {
                myhost = host;
                this->LinkState = LISTENER;

                Instance->Log(DEBUG, "HOOK = %08x", Hook);

                if (listening && Hook)
                        InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
        }

        TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, std::string ServerName, Module* HookMod = NULL)
                : InspSocket(SI, host, port, listening, maxtime), Utils(Util), Hook(HookMod)
        {
                myhost = ServerName;
                this->LinkState = CONNECTING;

                if (Hook)
                        InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
        }

        /** When a listening socket gives us a new file descriptor,
         * we must associate it with a socket without creating a new
         * connection. This constructor is used for this purpose.
         */
        TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod = NULL)
                : InspSocket(SI, newfd, ip), Utils(Util), Hook(HookMod)
        {
                this->LinkState = WAIT_AUTH_1;

                /* If we have a transport module hooked to the parent, hook the same module to this
                 * socket, and set a timer waiting for handshake before we send CAPAB etc.
                 */
                if (Hook)
                {
                        InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
                        Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(Utils->LinkBlocks[0]), this->Utils));
                }
                else
                {
                        /* Otherwise, theres no lower layer transport in plain TCP/IP,
                         * so just send the capabilities right now.
                         */
                        this->SendCapabilities();
                }
        }

        ServerState GetLinkState()
        {
                return this->LinkState;
        }

        Module* GetHook()
        {
                return this->Hook;
        }

        ~TreeSocket()
        {
                if (Hook)
                        InspSocketUnhookRequest(this, (Module*)Utils->Creator, Hook).Send();
        }
        
        /** When an outbound connection finishes connecting, we receive
         * this event, and must send our SERVER string to the other
         * side. If the other side is happy, as outlined in the server
         * to server docs on the inspircd.org site, the other side
         * will then send back its own server string.
         */
        virtual bool OnConnected()
        {
                if (this->LinkState == CONNECTING)
                {
                        /* we do not need to change state here. */
                        for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
                        {
                                if (x->Name == this->myhost)
                                {
                                        this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] started.");

                                        if (Hook)
                                        {
                                                InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
                                                this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+x->Hook+"\2");
                                        }
                                        else
                                                this->SendCapabilities();

                                        /* found who we're supposed to be connecting to, send the neccessary gubbins. */
                                        if (Hook)
                                                Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(*x), this->Utils));
                                        else
                                                this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+x->SendPass+" 0 :"+this->Instance->Config->ServerDesc);

                                        return true;
                                }
                        }
                }
                /* There is a (remote) chance that between the /CONNECT and the connection
                 * being accepted, some muppet has removed the <link> block and rehashed.
                 * If that happens the connection hangs here until it's closed. Unlikely
                 * and rather harmless.
                 */
                this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2 lost link tag(!)");
                return true;
        }
        
        virtual void OnError(InspSocketError e)
        {
                /* We don't handle this method, because all our
                 * dirty work is done in OnClose() (see below)
                 * which is still called on error conditions too.
                 */
                if (e == I_ERR_CONNECT)
                {
                        this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Connection to \002"+myhost+"\002 refused");
                        Link* MyLink = Utils->FindLink(myhost);
                        if (MyLink)
                                Utils->DoFailOver(MyLink);
                }
        }

        virtual int OnDisconnect()
        {
                /* For the same reason as above, we don't
                 * handle OnDisconnect()
                 */
                return true;
        }

        /** Recursively send the server tree with distances as hops.
         * This is used during network burst to inform the other server
         * (and any of ITS servers too) of what servers we know about.
         * If at any point any of these servers already exist on the other
         * end, our connection may be terminated. The hopcounts given
         * by this function are relative, this doesn't matter so long as
         * they are all >1, as all the remote servers re-calculate them
         * to be relative too, with themselves as hop 0.
         */
        void SendServers(TreeServer* Current, TreeServer* s, int hops)
        {
                char command[1024];
                for (unsigned int q = 0; q < Current->ChildCount(); q++)
                {
                        TreeServer* recursive_server = Current->GetChild(q);
                        if (recursive_server != s)
                        {
                                snprintf(command,1024,":%s SERVER %s * %d :%s",Current->GetName().c_str(),recursive_server->GetName().c_str(),hops,recursive_server->GetDesc().c_str());
                                this->WriteLine(command);
                                this->WriteLine(":"+recursive_server->GetName()+" VERSION :"+recursive_server->GetVersion());
                                /* down to next level */
                                this->SendServers(recursive_server, s, hops+1);
                        }
                }
        }

        std::string MyCapabilities()
        {
                std::vector<std::string> modlist;
                std::string capabilities = "";

                for (int i = 0; i <= this->Instance->GetModuleCount(); i++)
                {
                        if (this->Instance->modules[i]->GetVersion().Flags & VF_COMMON)
                                modlist.push_back(this->Instance->Config->module_names[i]);
                }
                sort(modlist.begin(),modlist.end());
                for (unsigned int i = 0; i < modlist.size(); i++)
                {
                        if (i)
                                capabilities = capabilities + ",";
                        capabilities = capabilities + modlist[i];
                }
                return capabilities;
        }
        
        void SendCapabilities()
        {
                irc::commasepstream modulelist(MyCapabilities());

                this->WriteLine("CAPAB START");

                /* Send module names, split at 509 length */
                std::string item = "*";
                std::string line = "CAPAB MODULES ";
                while ((item = modulelist.GetToken()) != "")
                {
                        if (line.length() + item.length() + 1 > 509)
                        {
                                this->WriteLine(line);
                                line = "CAPAB MODULES ";
                        }

                        if (line != "CAPAB MODULES ")
                                line.append(",");

                        line.append(item);
                }
                if (line != "CAPAB MODULES ")
                        this->WriteLine(line);

                int ip6 = 0;
                int ip6support = 0;
#ifdef IPV6
                ip6 = 1;
#endif
#ifdef SUPPORT_IP6LINKS
                ip6support = 1;
#endif
                this->WriteLine("CAPAB CAPABILITIES :NICKMAX="+ConvToStr(NICKMAX)+" HALFOP="+ConvToStr(this->Instance->Config->AllowHalfop)+" CHANMAX="+ConvToStr(CHANMAX)+" MAXMODES="+ConvToStr(MAXMODES)+" IDENTMAX="+ConvToStr(IDENTMAX)+" MAXQUIT="+ConvToStr(MAXQUIT)+" MAXTOPIC="+ConvToStr(MAXTOPIC)+" MAXKICK="+ConvToStr(MAXKICK)+" MAXGECOS="+ConvToStr(MAXGECOS)+" MAXAWAY="+ConvToStr(MAXAWAY)+" IP6NATIVE="+ConvToStr(ip6)+" IP6SUPPORT="+ConvToStr(ip6support)+" PROTOCOL="+ConvToStr(ProtocolVersion));

                this->WriteLine("CAPAB END");
        }

        /* Check a comma seperated list for an item */
        bool HasItem(const std::string &list, const std::string &item)
        {
                irc::commasepstream seplist(list);

                std::string item2 = "*";
                while ((item2 = seplist.GetToken()) != "")
                {
                        if (item2 == item)
                                return true;
                }

                return false;
        }

        /* Isolate and return the elements that are different between two comma seperated lists */
        std::string ListDifference(const std::string &one, const std::string &two)
        {
                irc::commasepstream list_one(one);
                std::string item = "*";
                std::string result = "";
                while ((item = list_one.GetToken()) != "")
                {
                        if (!HasItem(two, item))
                        {
                                result.append(" ");
                                result.append(item);
                        }
                }
                return result;
        }

        bool Capab(const std::deque<std::string> &params)
        {
                if (params.size() < 1)
                {
                        this->WriteLine("ERROR :Invalid number of parameters for CAPAB - Mismatched version");
                        return false;
                }

                if (params[0] == "START")
                {
                        this->ModuleList = "";
                        this->CapKeys.clear();
                }
                else if (params[0] == "END")
                {
                        std::string reason = "";
                        int ip6support = 0;
#ifdef SUPPORT_IP6LINKS
                        ip6support = 1;
#endif
                        /* Compare ModuleList and check CapKeys...
                         * Maybe this could be tidier? -- Brain
                         */
                        if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
                        {
                                std::string diff = ListDifference(this->ModuleList, this->MyCapabilities());
                                if (!diff.length())
                                {
                                        diff = "your server:" + ListDifference(this->MyCapabilities(), this->ModuleList);
                                }
                                else
                                {
                                        diff = "this server:" + diff;
                                }
                                if (diff.length() == 12)
                                        reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
                                else
                                        reason = "Modules loaded on these servers are not correctly matched, these modules are not loaded on " + diff;
                        }

                        if (((this->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support))))
                                reason = "We don't both support linking to IPV6 servers";

                        if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support))
                                reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers";

                        if (((this->CapKeys.find("NICKMAX") == this->CapKeys.end()) || ((this->CapKeys.find("NICKMAX") != this->CapKeys.end()) && (this->CapKeys.find("NICKMAX")->second != ConvToStr(NICKMAX)))))
                                reason = "Maximum nickname lengths differ or remote nickname length not specified";

                        if (((this->CapKeys.find("PROTOCOL") == this->CapKeys.end()) || ((this->CapKeys.find("PROTOCOL") != this->CapKeys.end()) && (this->CapKeys.find("PROTOCOL")->second != ConvToStr(ProtocolVersion)))))
                        {
                                if (this->CapKeys.find("PROTOCOL") != this->CapKeys.end())
                                {
                                        reason = "Mismatched protocol versions "+this->CapKeys.find("PROTOCOL")->second+" and "+ConvToStr(ProtocolVersion);
                                }
                                else
                                {
                                        reason = "Protocol version not specified";
                                }
                        }

                        if (((this->CapKeys.find("HALFOP") == this->CapKeys.end()) && (Instance->Config->AllowHalfop)) || ((this->CapKeys.find("HALFOP") != this->CapKeys.end()) && (this->CapKeys.find("HALFOP")->second != ConvToStr(Instance->Config->AllowHalfop))))
                                reason = "We don't both have halfop support enabled/disabled identically";

                        if (((this->CapKeys.find("IDENTMAX") == this->CapKeys.end()) || ((this->CapKeys.find("IDENTMAX") != this->CapKeys.end()) && (this->CapKeys.find("IDENTMAX")->second != ConvToStr(IDENTMAX)))))
                                reason = "Maximum ident lengths differ or remote ident length not specified";

                        if (((this->CapKeys.find("CHANMAX") == this->CapKeys.end()) || ((this->CapKeys.find("CHANMAX") != this->CapKeys.end()) && (this->CapKeys.find("CHANMAX")->second != ConvToStr(CHANMAX)))))
                                reason = "Maximum channel lengths differ or remote channel length not specified";

                        if (((this->CapKeys.find("MAXMODES") == this->CapKeys.end()) || ((this->CapKeys.find("MAXMODES") != this->CapKeys.end()) && (this->CapKeys.find("MAXMODES")->second != ConvToStr(MAXMODES)))))
                                reason = "Maximum modes per line differ or remote modes per line not specified";

                        if (((this->CapKeys.find("MAXQUIT") == this->CapKeys.end()) || ((this->CapKeys.find("MAXQUIT") != this->CapKeys.end()) && (this->CapKeys.find("MAXQUIT")->second != ConvToStr(MAXQUIT)))))
                                reason = "Maximum quit lengths differ or remote quit length not specified";

                        if (((this->CapKeys.find("MAXTOPIC") == this->CapKeys.end()) || ((this->CapKeys.find("MAXTOPIC") != this->CapKeys.end()) && (this->CapKeys.find("MAXTOPIC")->second != ConvToStr(MAXTOPIC)))))
                                reason = "Maximum topic lengths differ or remote topic length not specified";

                        if (((this->CapKeys.find("MAXKICK") == this->CapKeys.end()) || ((this->CapKeys.find("MAXKICK") != this->CapKeys.end()) && (this->CapKeys.find("MAXKICK")->second != ConvToStr(MAXKICK)))))
                                reason = "Maximum kick lengths differ or remote kick length not specified";

                        if (((this->CapKeys.find("MAXGECOS") == this->CapKeys.end()) || ((this->CapKeys.find("MAXGECOS") != this->CapKeys.end()) && (this->CapKeys.find("MAXGECOS")->second != ConvToStr(MAXGECOS)))))
                                reason = "Maximum GECOS (fullname) lengths differ or remote GECOS length not specified";

                        if (((this->CapKeys.find("MAXAWAY") == this->CapKeys.end()) || ((this->CapKeys.find("MAXAWAY") != this->CapKeys.end()) && (this->CapKeys.find("MAXAWAY")->second != ConvToStr(MAXAWAY)))))
                                reason = "Maximum awaymessage lengths differ or remote awaymessage length not specified";

                        if (reason.length())
                        {
                                this->WriteLine("ERROR :CAPAB negotiation failed: "+reason);
                                return false;
                        }
                }
                else if ((params[0] == "MODULES") && (params.size() == 2))
                {
                        if (!this->ModuleList.length())
                        {
                                this->ModuleList.append(params[1]);
                        }
                        else
                        {
                                this->ModuleList.append(",");
                                this->ModuleList.append(params[1]);
                        }
                }
                else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
                {
                        irc::tokenstream capabs(params[1]);
                        std::string item = "*";
                        while ((item = capabs.GetToken()) != "")
                        {
                                /* Process each key/value pair */
                                std::string::size_type equals = item.rfind('=');
                                if (equals != std::string::npos)
                                {
                                        std::string var = item.substr(0, equals);
                                        std::string value = item.substr(equals+1, item.length());
                                        this->Instance->Log(DEBUG,"Key='%s' Value='%s'",var.c_str(),value.c_str());
                                        CapKeys[var] = value;
                                }
                        }
                }

                return true;
        }

        /** This function forces this server to quit, removing this server
         * and any users on it (and servers and users below that, etc etc).
         * It's very slow and pretty clunky, but luckily unless your network
         * is having a REAL bad hair day, this function shouldnt be called
         * too many times a month ;-)
         */
        void SquitServer(std::string &from, TreeServer* Current)
        {
                /* recursively squit the servers attached to 'Current'.
                 * We're going backwards so we don't remove users
                 * while we still need them ;)
                 */
                for (unsigned int q = 0; q < Current->ChildCount(); q++)
                {
                        TreeServer* recursive_server = Current->GetChild(q);
                        this->SquitServer(from,recursive_server);
                }
                /* Now we've whacked the kids, whack self */
                num_lost_servers++;
                num_lost_users += Current->QuitUsers(from);
        }

        /** This is a wrapper function for SquitServer above, which
         * does some validation first and passes on the SQUIT to all
         * other remaining servers.
         */
        void Squit(TreeServer* Current, const std::string &reason)
        {
                if ((Current) && (Current != Utils->TreeRoot))
                {
                        Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server");
                        rmode.Send(Instance);

                        std::deque<std::string> params;
                        params.push_back(Current->GetName());
                        params.push_back(":"+reason);
                        Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
                        if (Current->GetParent() == Utils->TreeRoot)
                        {
                                this->Instance->WriteOpers("Server \002"+Current->GetName()+"\002 split: "+reason);
                        }
                        else
                        {
                                this->Instance->WriteOpers("Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
                        }
                        num_lost_servers = 0;
                        num_lost_users = 0;
                        std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
                        SquitServer(from, Current);
                        Current->Tidy();
                        Current->GetParent()->DelChild(Current);
                        DELETE(Current);
                        this->Instance->WriteOpers("Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
                }
                else
                {
                        Instance->Log(DEFAULT,"Squit from unknown server");
                }
        }

        /** FMODE command - server mode with timestamp checks */
        bool ForceMode(const std::string &source, std::deque<std::string> &params)
        {
                /* Chances are this is a 1.0 FMODE without TS */
                if (params.size() < 3)
                {
                        /* No modes were in the command, probably a channel with no modes set on it */
                        return true;
                }
                
                bool smode = false;
                std::string sourceserv;

                /* Are we dealing with an FMODE from a user, or from a server? */
                userrec* who = this->Instance->FindNick(source);
                if (who)
                {
                        /* FMODE from a user, set sourceserv to the users server name */
                        sourceserv = who->server;
                }
                else
                {
                        /* FMODE from a server, create a fake user to receive mode feedback */
                        who = new userrec(this->Instance);
                        who->SetFd(FD_MAGIC_NUMBER);
                        smode = true;           /* Setting this flag tells us we should free the userrec later */
                        sourceserv = source;    /* Set sourceserv to the actual source string */
                }
                const char* modelist[64];
                time_t TS = 0;
                int n = 0;
                memset(&modelist,0,sizeof(modelist));
                for (unsigned int q = 0; (q < params.size()) && (q < 64); q++)
                {
                        if (q == 1)
                        {
                                /* The timestamp is in this position.
                                 * We don't want to pass that up to the
                                 * server->client protocol!
                                 */
                                TS = atoi(params[q].c_str());
                        }
                        else
                        {
                                /* Everything else is fine to append to the modelist */
                                modelist[n++] = params[q].c_str();
                        }
                                
                }
                /* Extract the TS value of the object, either userrec or chanrec */
                userrec* dst = this->Instance->FindNick(params[0]);
                chanrec* chan = NULL;
                time_t ourTS = 0;
                if (dst)
                {
                        ourTS = dst->age;
                }
                else
                {
                        chan = this->Instance->FindChan(params[0]);
                        if (chan)
                        {
                                ourTS = chan->age;
                        }
                        else
                                /* Oops, channel doesnt exist! */
                                return true;
                }

                /* TS is equal: Merge the mode changes, use voooodoooooo on modes
                 * with parameters.
                 */
                if (TS == ourTS)
                {
                        Instance->Log(DEBUG,"Entering TS equality check");
                        ModeHandler* mh = NULL;
                        unsigned long paramptr = 3;
                        std::string to_bounce = "";
                        std::string to_keep = "";
                        std::vector<std::string> params_to_keep;
                        std::string params_to_bounce = "";
                        bool adding = true;
                        char cur_change = 1;
                        char old_change = 0;
                        char old_bounce_change = 0;
                        /* Merge modes, basically do special stuff to mode with params */
                        for (std::string::iterator x = params[2].begin(); x != params[2].end(); x++)
                        {
                                switch (*x)
                                {
                                        case '-':
                                                adding = false;
                                        break;
                                        case '+':
                                                adding = true;
                                        break;
                                        default:
                                                if (adding)
                                                {
                                                        /* We only care about whats being set,
                                                         * not whats being unset
                                                         */
                                                        mh = this->Instance->Modes->FindMode(*x, chan ? MODETYPE_CHANNEL : MODETYPE_USER);

                                                        if ((mh) && (mh->GetNumParams(adding) > 0) && (!mh->IsListMode()))
                                                        {
                                                                /* We only want to do special things to
                                                                 * modes with parameters, we are going to rewrite
                                                                 * those parameters
                                                                 */
                                                                ModePair ret;
                                                                adding ? cur_change = '+' : cur_change = '-';

                                                                ret = mh->ModeSet(smode ? NULL : who, dst, chan, params[paramptr]);

                                                                /* The mode is set here, check which we should keep */
                                                                if (ret.first)
                                                                {
                                                                        bool which_to_keep = mh->CheckTimeStamp(TS, ourTS, params[paramptr], ret.second, chan);

                                                                        if (which_to_keep == true)
                                                                        {
                                                                                /* Keep ours, bounce theirs:
                                                                                 * Send back ours to them and
                                                                                 * drop their mode changs
                                                                                 */
                                                                                adding ? cur_change = '+' : cur_change = '-';
                                                                                if (cur_change != old_bounce_change)
                                                                                        to_bounce += cur_change;
                                                                                to_bounce += *x;
                                                                                old_bounce_change = cur_change;

                                                                                if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
                                                                                        params_to_bounce.append(" ").append(ret.second);
                                                                        }
                                                                        else
                                                                        {
                                                                                /* Keep theirs: Accept their mode change,
                                                                                 * do nothing else
                                                                                 */
                                                                                adding ? cur_change = '+' : cur_change = '-';
                                                                                if (cur_change != old_change)
                                                                                        to_keep += cur_change;
                                                                                to_keep += *x;
                                                                                old_change = cur_change;

                                                                                if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
                                                                                        params_to_keep.push_back(params[paramptr]);
                                                                        }
                                                                }
                                                                else
                                                                {
                                                                        /* Mode isnt set here, we want it */
                                                                        adding ? cur_change = '+' : cur_change = '-';
                                                                        if (cur_change != old_change)
                                                                                to_keep += cur_change;
                                                                        to_keep += *x;
                                                                        old_change = cur_change;

                                                                        if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
                                                                                params_to_keep.push_back(params[paramptr]);
                                                                }

                                                                paramptr++;
                                                        }
                                                        else
                                                        {
                                                                mh = this->Instance->Modes->FindMode(*x, chan ? MODETYPE_CHANNEL : MODETYPE_USER);

                                                                if (mh)
                                                                {
                                                                        adding ? cur_change = '+' : cur_change = '-';
        
                                                                        /* Just keep this, safe to merge with no checks
                                                                         * it has no parameters
                                                                         */
        
                                                                        if (cur_change != old_change)
                                                                                to_keep += cur_change;
                                                                        to_keep += *x;
                                                                        old_change = cur_change;
        
                                                                        if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
                                                                        {
                                                                                Instance->Log(DEBUG,"Mode removal %d %d",adding, mh->GetNumParams(adding));
                                                                                params_to_keep.push_back(params[paramptr++]);
                                                                        }
                                                                }
                                                        }
                                                }
                                                else
                                                {
                                                        mh = this->Instance->Modes->FindMode(*x, chan ? MODETYPE_CHANNEL : MODETYPE_USER);

                                                        if (mh)
                                                        {
                                                                /* Taking a mode away */
                                                                adding ? cur_change = '+' : cur_change = '-';

                                                                if (cur_change != old_change)
                                                                        to_keep += cur_change;
                                                                to_keep += *x;
                                                                old_change = cur_change;

                                                                if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
                                                                        params_to_keep.push_back(params[paramptr++]);
                                                        }
                                                }
                                        break;
                                }
                        }

                        if (to_bounce.length())
                        {
                                std::deque<std::string> newparams;
                                newparams.push_back(params[0]);
                                newparams.push_back(ConvToStr(ourTS));
                                newparams.push_back(to_bounce+params_to_bounce);
                                Instance->Log(DEBUG,"BOUNCE BACK: %s",(to_bounce+params_to_bounce).c_str());
                                Utils->DoOneToOne(this->Instance->Config->ServerName,"FMODE",newparams,sourceserv);
                        }

                        if (to_keep.length())
                        {
                                unsigned int n = 2;
                                unsigned int q = 0;
                                modelist[0] = params[0].c_str();
                                modelist[1] = to_keep.c_str();

                                if (params_to_keep.size() > 0)
                                {
                                        for (q = 0; (q < params_to_keep.size()) && (q < 64); q++)
                                        {
                                                Instance->Log(DEBUG,"KEEP Item %d of %d: %s", q, params_to_keep.size(), params_to_keep[q].c_str());
                                                modelist[n++] = params_to_keep[q].c_str();
                                        }
                                }

                                if (smode)
                                {
                                        Instance->Log(DEBUG,"Send mode");
                                        this->Instance->SendMode(modelist, n, who);
                                }
                                else
                                {
                                        Instance->Log(DEBUG,"Send mode client");
                                        this->Instance->CallCommandHandler("MODE", modelist, n, who);
                                }

                                /* HOT POTATO! PASS IT ON! */
                                Utils->DoOneToAllButSender(source,"FMODE",params,sourceserv);
                        }
                }
                else
                /* U-lined servers always win regardless of their TS */
                if ((TS > ourTS) && (!this->Instance->ULine(source.c_str())))
                {
                        /* Bounce the mode back to its sender.* We use our lower TS, so the other end
                         * SHOULD accept it, if its clock is right.
                         *
                         * NOTE: We should check that we arent bouncing anything thats already set at this end.
                         * If we are, bounce +ourmode to 'reinforce' it. This prevents desyncs.
                         * e.g. They send +l 50, we have +l 10 set. rather than bounce -l 50, we bounce +l 10.
                         *
                         * Thanks to jilles for pointing out this one-hell-of-an-issue before i even finished
                         * writing the code. It took me a while to come up with this solution.
                         *
                         * XXX: BE SURE YOU UNDERSTAND THIS CODE FULLY BEFORE YOU MESS WITH IT.
                         */

                        std::deque<std::string> newparams;      /* New parameter list we send back */
                        newparams.push_back(params[0]);         /* Target, user or channel */
                        newparams.push_back(ConvToStr(ourTS));  /* Timestamp value of the target */
                        newparams.push_back("");                /* This contains the mode string. For now
                                                                 * it's empty, we fill it below.
                                                                 */

                        /* Intelligent mode bouncing. Don't just invert, reinforce any modes which are already
                         * set to avoid a desync here.
                         */
                        std::string modebounce = "";
                        bool adding = true;
                        unsigned int t = 3;
                        ModeHandler* mh = NULL;
                        char cur_change = 1;
                        char old_change = 0;
                        for (std::string::iterator x = params[2].begin(); x != params[2].end(); x++)
                        {
                                /* Iterate over all mode chars in the sent set */
                                switch (*x)
                                {
                                        /* Adding or subtracting modes? */
                                        case '-':
                                                adding = false;
                                        break;
                                        case '+':
                                                adding = true;
                                        break;
                                        default:
                                                /* Find the mode handler for this mode */
                                                mh = this->Instance->Modes->FindMode(*x, chan ? MODETYPE_CHANNEL : MODETYPE_USER);

                                                /* Got a mode handler?
                                                 * This also prevents us bouncing modes we have no handler for.
                                                 */
                                                if (mh)
                                                {
                                                        ModePair ret;
                                                        std::string p = "";

                                                        /* Does the mode require a parameter right now?
                                                         * If it does, fetch it if we can
                                                         */
                                                        if ((mh->GetNumParams(adding) > 0) && (t < params.size()))
                                                                p = params[t++];

                                                        /* Call the ModeSet method to determine if its set with the
                                                         * given parameter here or not.
                                                         */
                                                        ret = mh->ModeSet(smode ? NULL : who, dst, chan, p);

                                                        /* XXX: Really. Dont ask.
                                                         * Determine from if its set combined with what the current
                                                         * 'state' is (adding or not) as to wether we should 'invert'
                                                         * or 'reinforce' the mode change
                                                         */
                                                        (!ret.first ? (adding ? cur_change = '-' : cur_change = '+') : (!adding ? cur_change = '-' : cur_change = '+'));

                                                        /* Quickly determine if we have 'flipped' from + to -,
                                                         * or - to +, to prevent unneccessary +/- chars in the
                                                         * output string that waste bandwidth
                                                         */
                                                        if (cur_change != old_change)
                                                                modebounce += cur_change;
                                                        old_change = cur_change;

                                                        /* Add the mode character to the output string */
                                                        modebounce += mh->GetModeChar();

                                                        /* We got a parameter back from ModeHandler::ModeSet,
                                                         * are we supposed to be sending one out right now?
                                                         */
                                                        if (ret.second.length())
                                                        {
                                                                if (mh->GetNumParams(cur_change == '+') > 0)
                                                                        /* Yes we're supposed to be sending out
                                                                         * the parameter. Make sure it goes
                                                                         */
                                                                        newparams.push_back(ret.second);
                                                        }

                                                }
                                        break;
                                }
                        }
                        
                        /* Update the parameters for FMODE with the new 'bounced' string */
                        newparams[2] = modebounce;
                        /* Only send it back the way it came, no need to send it anywhere else */
                        Utils->DoOneToOne(this->Instance->Config->ServerName,"FMODE",newparams,sourceserv);
                        Instance->Log(DEBUG,"FMODE bounced intelligently, our TS less than theirs and the other server is NOT a uline.");
                }
                else
                {
                        Instance->Log(DEBUG,"Allow modes, TS lower for sender");
                        /* The server was ulined, but something iffy is up with the TS.
                         * Sound the alarm bells!
                         */
                        if ((this->Instance->ULine(sourceserv.c_str())) && (TS > ourTS))
                        {
                                this->Instance->WriteOpers("\2WARNING!\2 U-Lined server '%s' has bad TS for '%s' (accepted change): \2SYNC YOUR CLOCKS\2 to avoid this notice",sourceserv.c_str(),params[0].c_str());
                        }
                        /* Allow the mode, route it to either server or user command handling */
                        if (smode)
                                this->Instance->SendMode(modelist,n,who);
                        else
                                this->Instance->CallCommandHandler("MODE", modelist, n, who);

                        /* HOT POTATO! PASS IT ON! */
                        Utils->DoOneToAllButSender(source,"FMODE",params,sourceserv);
                }
                /* Are we supposed to free the userrec? */
                if (smode)
                        DELETE(who);

                return true;
        }

        /** FTOPIC command */
        bool ForceTopic(const std::string &source, std::deque<std::string> &params)
        {
                if (params.size() != 4)
                        return true;
                time_t ts = atoi(params[1].c_str());
                std::string nsource = source;

                chanrec* c = this->Instance->FindChan(params[0]);
                if (c)
                {
                        if ((ts >= c->topicset) || (!*c->topic))
                        {
                                std::string oldtopic = c->topic;
                                strlcpy(c->topic,params[3].c_str(),MAXTOPIC);
                                strlcpy(c->setby,params[2].c_str(),NICKMAX-1);
                                c->topicset = ts;
                                /* if the topic text is the same as the current topic,
                                 * dont bother to send the TOPIC command out, just silently
                                 * update the set time and set nick.
                                 */
                                if (oldtopic != params[3])
                                {
                                        userrec* user = this->Instance->FindNick(source);
                                        if (!user)
                                        {
                                                c->WriteChannelWithServ(source.c_str(), "TOPIC %s :%s", c->name, c->topic);
                                        }
                                        else
                                        {
                                                c->WriteChannel(user, "TOPIC %s :%s", c->name, c->topic);
                                                nsource = user->server;
                                        }
                                        /* all done, send it on its way */
                                        params[3] = ":" + params[3];
                                        Utils->DoOneToAllButSender(source,"FTOPIC",params,nsource);
                                }
                        }
                        
                }

                return true;
        }

        /** FJOIN, similar to TS6 SJOIN, but not quite. */
        bool ForceJoin(const std::string &source, std::deque<std::string> &params)
        {
                /* 1.1 FJOIN works as follows:
                 *
                 * Each FJOIN is sent along with a timestamp, and the side with the lowest
                 * timestamp 'wins'. From this point on we will refer to this side as the
                 * winner. The side with the higher timestamp loses, from this point on we
                 * will call this side the loser or losing side. This should be familiar to
                 * anyone who's dealt with dreamforge or TS6 before.
                 *
                 * When two sides of a split heal and this occurs, the following things
                 * will happen:
                 *
                 * If the timestamps are exactly equal, both sides merge their privilages
                 * and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
                 * re-created during a split, this is safe to do.
                 *
                 *
                 * If the timestamps are NOT equal, the losing side removes all privilage
                 * modes from all of its users that currently exist in the channel, before
                 * introducing new users into the channel which are listed in the FJOIN
                 * command's parameters. This means, all modes +ohv, and privilages added
                 * by modules, such as +qa. The losing side then LOWERS its timestamp value
                 * of the channel to match that of the winning side, and the modes of the
                 * users of the winning side are merged in with the losing side. The loser
                 * then sends out a set of FMODE commands which 'confirm' that it just
                 * removed all privilage modes from its existing users, which allows for
                 * services packages to still work correctly without needing to know the
                 * timestamping rules which InspIRCd follows. In TS6 servers this is always
                 * a problem, and services packages must contain code which explicitly
                 * behaves as TS6 does, removing ops from the losing side of a split where
                 * neccessary within its internal records, as this state information is
                 * not explicitly echoed out in that protocol.
                 *
                 * The winning side on the other hand will ignore all user modes from the
                 * losing side, so only its own modes get applied. Life is simple for those
                 * who succeed at internets. :-)
                 *
                 * NOTE: Unlike TS6 and dreamforge and other protocols which have SJOIN,
                 * FJOIN does not contain the simple-modes such as +iklmnsp. Why not,
                 * you ask? Well, quite simply because we don't need to. They'll be sent
                 * after the FJOIN by FMODE, and FMODE is timestamped, so in the event
                 * the losing side sends any modes for the channel which shouldnt win,
                 * they wont as their timestamp will be too high :-)
                 */

                if (params.size() < 3)
                        return true;

                char first[MAXBUF];             /* The first parameter of the mode command */
                char modestring[MAXBUF];        /* The mode sequence (2nd parameter) of the mode command */
                char* mode_users[127];          /* The values used by the mode command */
                memset(&mode_users,0,sizeof(mode_users));       /* Initialize mode parameters */
                mode_users[0] = first;          /* Set this up to be our on-stack value */
                mode_users[1] = modestring;     /* Same here as above */
                strcpy(modestring,"+");         /* Initialize the mode sequence to just '+' */
                unsigned int modectr = 2;       /* Pointer to the third mode parameter (e.g. the one after the +-sequence) */
                
                userrec* who = NULL;                    /* User we are currently checking */
                std::string channel = params[0];        /* Channel name, as a string */
                time_t TS = atoi(params[1].c_str());    /* Timestamp given to us for remote side */
                bool created = false;
                
                /* Try and find the channel */
                chanrec* chan = this->Instance->FindChan(channel);

                /* Initialize channel name in the mode parameters */
                strlcpy(mode_users[0],channel.c_str(),MAXBUF);

                /* default TS is a high value, which if we dont have this
                 * channel will let the other side apply their modes.
                 */
                time_t ourTS = Instance->Time(true)+600;

                /* Does this channel exist? if it does, get its REAL timestamp */
                if (chan)
                        ourTS = chan->age;
                else
                        created = true; /* don't perform deops, and set TS to correct time after processing. */

                /* In 1.1, if they have the newer channel, we immediately clear
                 * all status modes from our users. We then accept their modes.
                 * If WE have the newer channel its the other side's job to do this.
                 * Note that this causes the losing server to send out confirming
                 * FMODE lines.
                 */
                if (ourTS > TS)
                {
                        Instance->Log(DEBUG,"************ WE LOST TS COMPARE, DEOPPING EVERYONE ********************* ");
                        std::deque<std::string> param_list;

                        /* Lower the TS here */
                        if (Utils->AnnounceTSChange && chan)
                                chan->WriteChannelWithServ(Instance->Config->ServerName,
                                "NOTICE %s :TS for %s changed from %lu to %lu", chan->name, chan->name, ourTS, TS);
                        ourTS = TS;

                        /* Zap all the privilage modes on our side, if the channel exists here */
                        if (!created)
                        {
                                param_list.push_back(channel);
                                this->RemoveStatus(Instance->Config->ServerName, param_list);
                                chan->age = TS;
                        }
                }

                /* Put the final parameter of the FJOIN into a tokenstream ready to split it */
                irc::tokenstream users(params[2]);
                std::string item = "*";

                /* do this first, so our mode reversals are correctly received by other servers
                 * if there is a TS collision.
                 */
                params[2] = ":" + params[2];
                Utils->DoOneToAllButSender(source,"FJOIN",params,source);

                /* Now, process every 'prefixes,nick' pair */
                while (item != "")
                {
                        /* Find next user */
                        item = users.GetToken();

                        const char* usr = item.c_str();

                        /* Safety check just to make sure someones not sent us an FJOIN full of spaces
                         * (is this even possible?) */
                        if (usr && *usr)
                        {
                                const char* permissions = usr;
                                int ntimes = 0;
                                char* nm = new char[MAXBUF];
                                char* tnm = nm;

                                /* Iterate through all the prefix values, convert them from prefixes
                                 * to mode letters, and append them to the mode sequence
                                 */
                                while ((*permissions) && (*permissions != ',') && (ntimes < MAXBUF))
                                {
                                        ModeHandler* mh = Instance->Modes->FindPrefix(*permissions);
                                        if (mh)
                                        {
                                                /* This is a valid prefix */
                                                ntimes++;
                                                *tnm++ = mh->GetModeChar();
                                        }
                                        else
                                        {
                                                /* Not a valid prefix...
                                                 * danger bill bobbertson! (that's will robinsons older brother ;-) ...)
                                                 */
                                                this->Instance->WriteOpers("ERROR: We received a user with an unknown prefix '%c'. Closed connection to avoid a desync.",*permissions);
                                                this->WriteLine(std::string("ERROR :Invalid prefix '")+(*permissions)+"' in FJOIN");
                                                return false;
                                        }
                                        usr++;
                                        permissions++;
                                }

                                /* Null terminate modes */
                                *tnm = 0;
                                /* Advance past the comma, to the nick */
                                usr++;

                                /* Check the user actually exists */
                                who = this->Instance->FindNick(usr);
                                if (who)
                                {
                                        /* Did they get any modes? How many times? */
                                        strlcat(modestring, nm, MAXBUF);
                                        for (int k = 0; k < ntimes; k++)
                                                mode_users[modectr++] = strdup(usr);

                                        /* Free temporary buffer used for mode sequence */
                                        delete[] nm;

                                        /* Check that the user's 'direction' is correct
                                         * based on the server sending the FJOIN. We must
                                         * check each nickname in turn, because the origin of
                                         * the FJOIN may be different to the origin of the nicks
                                         * in the command itself.
                                         */
                                        TreeServer* route_back_again = Utils->BestRouteTo(who->server);
                                        if ((!route_back_again) || (route_back_again->GetSocket() != this))
                                        {
                                                /* Oh dear oh dear. */
                                                Instance->Log(DEBUG,"Fake direction in FJOIN, user '%s'",who->nick);
                                                continue;
                                        }
                                        /* Finally, we can actually place the user into the channel.
                                         * We're sure its right. Final answer, phone a friend.
                                         */
                                        chanrec::JoinUser(this->Instance, who, channel.c_str(), true, "");

                                        /* Have we already queued up MAXMODES modes with parameters
                                         * (+qaohv) ready to be sent to the server?
                                         */
                                        if (modectr >= (MAXMODES-1))
                                        {
                                                /* Only actually give the users any status if we lost
                                                 * the FJOIN or drew (equal timestamps).
                                                 * It isn't actually possible for ourTS to be > TS here,
                                                 * only possible to actually have ourTS == TS, or
                                                 * ourTS < TS, because if we lost, we already lowered
                                                 * our TS above before we entered this loop. We only
                                                 * check >= as a safety measure, in case someone stuffed
                                                 * up. If someone DID stuff up, it was most likely me.
                                                 * Note: I do not like baseball bats in the face...
                                                 */
                                                if (ourTS >= TS)
                                                {
                                                        Instance->Log(DEBUG,"Our our channel newer than theirs, accepting their modes");
                                                        this->Instance->SendMode((const char**)mode_users,modectr,who);

                                                        /* Something stuffed up, and for some reason, the timestamp is
                                                         * NOT lowered right now and should be. Lower it. Usually this
                                                         * code won't be executed, doubtless someone will remove it some
                                                         * day soon.
                                                         */
                                                        if (ourTS > TS)
                                                        {
                                                                Instance->Log(DEFAULT,"Channel TS for %s changed from %lu to %lu",chan->name,ourTS,TS);
                                                                chan->age = TS;
                                                                ourTS = TS;
                                                        }
                                                }

                                                /* Reset all this back to defaults, and
                                                 * free any ram we have left allocated.
                                                 */
                                                strcpy(mode_users[1],"+");
                                                for (unsigned int f = 2; f < modectr; f++)
                                                        free(mode_users[f]);
                                                modectr = 2;
                                        }
                                }
                                else
                                {
                                        /* Remember to free this */
                                        delete[] nm;
                                        /* If we got here, there's a nick in FJOIN which doesnt exist on this server.
                                         * We don't try to process the nickname here (that WOULD cause a segfault because
                                         * we'd be playing with null pointers) however, we DO pass the nickname on, just
                                         * in case somehow we're desynched, so that other users which might be able to see
                                         * the nickname get their fair chance to process it.
                                         */
                                        Instance->Log(SPARSE,"Warning! Invalid user in FJOIN to channel %s IGNORED", channel.c_str());
                                        continue;
                                }
                        }
                }

                /* there werent enough modes built up to flush it during FJOIN,
                 * or, there are a number left over. flush them out.
                 */
                if ((modectr > 2) && (who) && (chan))
                {
                        if (ourTS >= TS)
                        {
                                /* Our channel is newer than theirs. Evil deeds must be afoot. */
                                this->Instance->SendMode((const char**)mode_users,modectr,who);
                                /* Yet again, we can't actually get a true value here, if everything else
                                 * is working as it should.
                                 */
                                if (ourTS > TS)
                                {
                                        Instance->Log(DEFAULT,"Channel TS for %s changed from %lu to %lu",chan->name,ourTS,TS);
                                        chan->age = TS;
                                        ourTS = TS;
                                }
                        }

                        /* Free anything we have left to free */
                        for (unsigned int f = 2; f < modectr; f++)
                                free(mode_users[f]);
                }

                /* if we newly created the channel, set it's TS properly. */
                if (created)
                {
                        /* find created channel .. */
                        chan = this->Instance->FindChan(channel);
                        if (chan)
                                /* w00t said this shouldnt be needed but it is.
                                 * This isnt strictly true, as chan can be NULL
                                 * if a nick collision has occured and therefore
                                 * the channel was never created.
                                 */
                                chan->age = TS;
                }

                /* All done. That wasnt so bad was it, you can wipe
                 * the sweat from your forehead now. :-)
                 */
                return true;
        }

        /** NICK command */
        bool IntroduceClient(const std::string &source, std::deque<std::string> &params)
        {
                if (params.size() < 8)
                        return true;
                if (params.size() > 8)
                {
                        this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction ("+params[1]+"?)");
                        return true;
                }
                // NICK age nick host dhost ident +modes ip :gecos
                //       0    1   2     3     4      5   6     7
                time_t age = atoi(params[0].c_str());
                
                /* This used to have a pretty craq'y loop doing the same thing,
                 * now we just let the STL do the hard work (more efficiently)
                 */
                std::string::size_type pos_after_plus = params[5].find_first_not_of('+');
                if (pos_after_plus != std::string::npos)
                        params[5] = params[5].substr(pos_after_plus);
                
                const char* tempnick = params[1].c_str();
                Instance->Log(DEBUG,"Introduce client %s!%s@%s",tempnick,params[4].c_str(),params[2].c_str());
                
                user_hash::iterator iter = this->Instance->clientlist->find(tempnick);
                
                if (iter != this->Instance->clientlist->end())
                {
                        // nick collision
                        Instance->Log(DEBUG,"Nick collision on %s!%s@%s: %lu %lu",tempnick,params[4].c_str(),params[2].c_str(),(unsigned long)age,(unsigned long)iter->second->age);
                        this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+tempnick+" :Nickname collision");
                        userrec::QuitUser(this->Instance, iter->second, "Nickname collision");
                        return true;
                }

                userrec* _new = new userrec(this->Instance);
                (*(this->Instance->clientlist))[tempnick] = _new;
                _new->SetFd(FD_MAGIC_NUMBER);
                strlcpy(_new->nick, tempnick,NICKMAX-1);
                strlcpy(_new->host, params[2].c_str(),63);
                strlcpy(_new->dhost, params[3].c_str(),63);
                _new->server = this->Instance->FindServerNamePtr(source.c_str());
                strlcpy(_new->ident, params[4].c_str(),IDENTMAX);
                strlcpy(_new->fullname, params[7].c_str(),MAXGECOS);
                _new->registered = REG_ALL;
                _new->signon = age;
                
                for (std::string::iterator v = params[5].begin(); v != params[5].end(); v++)
                        _new->modes[(*v)-65] = 1;

#ifdef SUPPORT_IP6LINKS
                if (params[6].find_first_of(":") != std::string::npos)
                        _new->SetSockAddr(AF_INET6, params[6].c_str(), 0);
                else
#endif
                        _new->SetSockAddr(AF_INET, params[6].c_str(), 0);

                Instance->AddGlobalClone(_new);

                this->Instance->SNO->WriteToSnoMask('C',"Client connecting at %s: %s!%s@%s [%s]",_new->server,_new->nick,_new->ident,_new->host, _new->GetIPString());

                params[7] = ":" + params[7];
                Utils->DoOneToAllButSender(source,"NICK",params,source);

                // Increment the Source Servers User Count..
                TreeServer* SourceServer = Utils->FindServer(source);
                if (SourceServer)
                {
                        Instance->Log(DEBUG,"Found source server of %s",_new->nick);
                        SourceServer->AddUserCount();
                }

                FOREACH_MOD_I(Instance,I_OnPostConnect,OnPostConnect(_new));

                return true;
        }

        /** Send one or more FJOINs for a channel of users.
         * If the length of a single line is more than 480-NICKMAX
         * in length, it is split over multiple lines.
         */
        void SendFJoins(TreeServer* Current, chanrec* c)
        {
                std::string buffer;

                Instance->Log(DEBUG,"Sending FJOINs to other server for %s",c->name);
                char list[MAXBUF];
                std::string individual_halfops = std::string(":")+this->Instance->Config->ServerName+" FMODE "+c->name+" "+ConvToStr(c->age);
                
                size_t dlen, curlen;
                dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
                int numusers = 0;
                char* ptr = list + dlen;

                CUList *ulist = c->GetUsers();
                std::string modes = "";
                std::string params = "";

                for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
                {
                        // The first parameter gets a : before it
                        size_t ptrlen = snprintf(ptr, MAXBUF, " %s%s,%s", !numusers ? ":" : "", c->GetAllPrefixChars(i->second), i->second->nick);

                        curlen += ptrlen;
                        ptr += ptrlen;

                        numusers++;

                        if (curlen > (480-NICKMAX))
                        {
                                buffer.append(list).append("\r\n");

                                dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
                                ptr = list + dlen;
                                ptrlen = 0;
                                numusers = 0;
                        }
                }

                if (numusers)
                        buffer.append(list).append("\r\n");

                /* Sorry for the hax. Because newly created channels assume +nt,
                 * if this channel doesnt have +nt, explicitly send -n and -t for the missing modes.
                 */
                bool inverted = false;
                if (!c->IsModeSet('n'))
                {
                        modes.append("-n");
                        inverted = true;
                }
                if (!c->IsModeSet('t'))
                {
                        modes.append("-t");
                        inverted = true;
                }
                if (inverted)
                {
                        modes.append("+");
                }

                for (BanList::iterator b = c->bans.begin(); b != c->bans.end(); b++)
                {
                        modes.append("b");
                        params.append(" ").append(b->data);

                        if (params.length() >= MAXMODES)
                        {
                                /* Wrap at MAXMODES */
                                buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params).append("\r\n");
                                modes = "";
                                params = "";
                        }
                }

                buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(c->ChanModes(true));

                /* Only send these if there are any */
                if (!modes.empty())
                        buffer.append("\r\n").append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params);

                this->WriteLine(buffer);
        }

        /** Send G, Q, Z and E lines */
        void SendXLines(TreeServer* Current)
        {
                char data[MAXBUF];
                std::string buffer;
                std::string n = this->Instance->Config->ServerName;
                const char* sn = n.c_str();

                /* Yes, these arent too nice looking, but they get the job done */
                for (std::vector<ZLine*>::iterator i = Instance->XLines->zlines.begin(); i != Instance->XLines->zlines.end(); i++)
                {
                        snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
                        buffer.append(data);
                }
                for (std::vector<QLine*>::iterator i = Instance->XLines->qlines.begin(); i != Instance->XLines->qlines.end(); i++)
                {
                        snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
                        buffer.append(data);
                }
                for (std::vector<GLine*>::iterator i = Instance->XLines->glines.begin(); i != Instance->XLines->glines.end(); i++)
                {
                        snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
                        buffer.append(data);
                }
                for (std::vector<ELine*>::iterator i = Instance->XLines->elines.begin(); i != Instance->XLines->elines.end(); i++)
                {
                        snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
                        buffer.append(data);
                }
                for (std::vector<ZLine*>::iterator i = Instance->XLines->pzlines.begin(); i != Instance->XLines->pzlines.end(); i++)
                {
                        snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
                        buffer.append(data);
                }
                for (std::vector<QLine*>::iterator i = Instance->XLines->pqlines.begin(); i != Instance->XLines->pqlines.end(); i++)
                {
                        snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
                        buffer.append(data);
                }
                for (std::vector<GLine*>::iterator i = Instance->XLines->pglines.begin(); i != Instance->XLines->pglines.end(); i++)
                {
                        snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
                        buffer.append(data);
                }
                for (std::vector<ELine*>::iterator i = Instance->XLines->pelines.begin(); i != Instance->XLines->pelines.end(); i++)
                {
                        snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
                        buffer.append(data);
                }

                if (!buffer.empty())
                        this->WriteLine(buffer);
        }

        /** Send channel modes and topics */
        void SendChannelModes(TreeServer* Current)
        {
                char data[MAXBUF];
                std::deque<std::string> list;
                std::string n = this->Instance->Config->ServerName;
                const char* sn = n.c_str();
                for (chan_hash::iterator c = this->Instance->chanlist->begin(); c != this->Instance->chanlist->end(); c++)
                {
                        SendFJoins(Current, c->second);
                        if (*c->second->topic)
                        {
                                snprintf(data,MAXBUF,":%s FTOPIC %s %lu %s :%s",sn,c->second->name,(unsigned long)c->second->topicset,c->second->setby,c->second->topic);
                                this->WriteLine(data);
                        }
                        FOREACH_MOD_I(this->Instance,I_OnSyncChannel,OnSyncChannel(c->second,(Module*)Utils->Creator,(void*)this));
                        list.clear();
                        c->second->GetExtList(list);
                        for (unsigned int j = 0; j < list.size(); j++)
                        {
                                FOREACH_MOD_I(this->Instance,I_OnSyncChannelMetaData,OnSyncChannelMetaData(c->second,(Module*)Utils->Creator,(void*)this,list[j]));
                        }
                }
        }

        /** send all users and their oper state/modes */
        void SendUsers(TreeServer* Current)
        {
                char data[MAXBUF];
                std::deque<std::string> list;
                std::string dataline;
                for (user_hash::iterator u = this->Instance->clientlist->begin(); u != this->Instance->clientlist->end(); u++)
                {
                        if (u->second->registered == REG_ALL)
                        {
                                snprintf(data,MAXBUF,":%s NICK %lu %s %s %s %s +%s %s :%s",u->second->server,(unsigned long)u->second->age,u->second->nick,u->second->host,u->second->dhost,u->second->ident,u->second->FormatModes(),u->second->GetIPString(),u->second->fullname);
                                this->WriteLine(data);
                                if (*u->second->oper)
                                {
                                        snprintf(data,MAXBUF,":%s OPERTYPE %s", u->second->nick, u->second->oper);
                                        this->WriteLine(data);
                                }
                                if (*u->second->awaymsg)
                                {
                                        snprintf(data,MAXBUF,":%s AWAY :%s", u->second->nick, u->second->awaymsg);
                                        this->WriteLine(data);
                                }
                                FOREACH_MOD_I(this->Instance,I_OnSyncUser,OnSyncUser(u->second,(Module*)Utils->Creator,(void*)this));
                                list.clear();
                                u->second->GetExtList(list);
                                for (unsigned int j = 0; j < list.size(); j++)
                                {
                                        FOREACH_MOD_I(this->Instance,I_OnSyncUserMetaData,OnSyncUserMetaData(u->second,(Module*)Utils->Creator,(void*)this,list[j]));
                                }
                        }
                }
        }

        /** This function is called when we want to send a netburst to a local
         * server. There is a set order we must do this, because for example
         * users require their servers to exist, and channels require their
         * users to exist. You get the idea.
         */
        void DoBurst(TreeServer* s)
        {
                std::string burst = "BURST "+ConvToStr(Instance->Time(true));
                std::string endburst = "ENDBURST";
                // Because by the end of the netburst, it  could be gone!
                std::string name = s->GetName();
                this->Instance->SNO->WriteToSnoMask('l',"Bursting to \2"+name+"\2.");
                this->WriteLine(burst);
                /* send our version string */
                this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" VERSION :"+this->Instance->GetVersionString());
                /* Send server tree */
                this->SendServers(Utils->TreeRoot,s,1);
                /* Send users and their oper status */
                this->SendUsers(s);
                /* Send everything else (channel modes, xlines etc) */
                this->SendChannelModes(s);
                this->SendXLines(s);            
                FOREACH_MOD_I(this->Instance,I_OnSyncOtherMetaData,OnSyncOtherMetaData((Module*)Utils->Creator,(void*)this));
                this->WriteLine(endburst);
                this->Instance->SNO->WriteToSnoMask('l',"Finished bursting to \2"+name+"\2.");
        }

        /** This function is called when we receive data from a remote
         * server. We buffer the data in a std::string (it doesnt stay
         * there for long), reading using InspSocket::Read() which can
         * read up to 16 kilobytes in one operation.
         *
         * IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES
         * THE SOCKET OBJECT FOR US.
         */
        virtual bool OnDataReady()
        {
                char* data = this->Read();
                /* Check that the data read is a valid pointer and it has some content */
                if (data && *data)
                {
                        this->in_buffer.append(data);
                        /* While there is at least one new line in the buffer,
                         * do something useful (we hope!) with it.
                         */
                        while (in_buffer.find("\n") != std::string::npos)
                        {
                                std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1);
                                in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n"));
                                /* Use rfind here not find, as theres more
                                 * chance of the \r being near the end of the
                                 * string, not the start.
                                 */
                                if (ret.find("\r") != std::string::npos)
                                        ret = in_buffer.substr(0,in_buffer.find("\r")-1);
                                /* Process this one, abort if it
                                 * didnt return true.
                                 */
                                if (!this->ProcessLine(ret))
                                {
                                        return false;
                                }
                        }
                        return true;
                }
                /* EAGAIN returns an empty but non-NULL string, so this
                 * evaluates to TRUE for EAGAIN but to FALSE for EOF.
                 */
                return (data && !*data);
        }

        int WriteLine(std::string line)
        {
                Instance->Log(DEBUG,"OUT: %s",line.c_str());
                line.append("\r\n");
                return this->Write(line);
        }

        /* Handle ERROR command */
        bool Error(std::deque<std::string> &params)
        {
                if (params.size() < 1)
                        return false;
                this->Instance->SNO->WriteToSnoMask('l',"ERROR from %s: %s",(InboundServerName != "" ? InboundServerName.c_str() : myhost.c_str()),params[0].c_str());
                /* we will return false to cause the socket to close. */
                return false;
        }

        /** remote MOTD. leet, huh? */
        bool Motd(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() > 0)
                {
                        if (this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
                        {
                                /* It's for our server */
                                string_list results;
                                userrec* source = this->Instance->FindNick(prefix);

                                if (source)
                                {
                                        std::deque<std::string> par;
                                        par.push_back(prefix);
                                        par.push_back("");

                                        if (!Instance->Config->MOTD.size())
                                        {
                                                par[1] = std::string("::")+Instance->Config->ServerName+" 422 "+source->nick+" :Message of the day file is missing.";
                                                Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
                                                return true;
                                        }
   
                                        par[1] = std::string("::")+Instance->Config->ServerName+" 375 "+source->nick+" :"+Instance->Config->ServerName+" message of the day";
                                        Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
   
                                        for (unsigned int i = 0; i < Instance->Config->MOTD.size(); i++)
                                        {
                                                par[1] = std::string("::")+Instance->Config->ServerName+" 372 "+source->nick+" :- "+Instance->Config->MOTD[i];
                                                Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
                                        }
     
                                        par[1] = std::string("::")+Instance->Config->ServerName+" 376 "+source->nick+" End of message of the day.";
                                        Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
                                }
                        }
                        else
                        {
                                /* Pass it on */
                                userrec* source = this->Instance->FindNick(prefix);
                                if (source)
                                        Utils->DoOneToOne(prefix, "MOTD", params, params[0]);
                        }
                }
                return true;
        }

        /** remote ADMIN. leet, huh? */
        bool Admin(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() > 0)
                {
                        if (this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
                        {
                                /* It's for our server */
                                string_list results;
                                userrec* source = this->Instance->FindNick(prefix);

                                if (source)
                                {
                                        std::deque<std::string> par;
                                        par.push_back(prefix);
                                        par.push_back("");

                                        par[1] = std::string("::")+Instance->Config->ServerName+" 256 "+source->nick+" :Administrative info for "+Instance->Config->ServerName;
                                        Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);

                                        par[1] = std::string("::")+Instance->Config->ServerName+" 257 "+source->nick+" :Name     - "+Instance->Config->AdminName;
                                        Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);

                                        par[1] = std::string("::")+Instance->Config->ServerName+" 258 "+source->nick+" :Nickname - "+Instance->Config->AdminNick;
                                        Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);

                                        par[1] = std::string("::")+Instance->Config->ServerName+" 258 "+source->nick+" :E-Mail   - "+Instance->Config->AdminEmail;
                                        Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
                                }
                        }
                        else
                        {
                                /* Pass it on */
                                userrec* source = this->Instance->FindNick(prefix);
                                if (source)
                                        Utils->DoOneToOne(prefix, "ADMIN", params, params[0]);
                        }
                }
                return true;
        }

        bool Stats(const std::string &prefix, std::deque<std::string> &params)
        {
                /* Get the reply to a STATS query if it matches this servername,
                 * and send it back as a load of PUSH queries
                 */
                if (params.size() > 1)
                {
                        if (this->Instance->MatchText(this->Instance->Config->ServerName, params[1]))
                        {
                                /* It's for our server */
                                string_list results;
                                userrec* source = this->Instance->FindNick(prefix);
                                if (source)
                                {
                                        std::deque<std::string> par;
                                        par.push_back(prefix);
                                        par.push_back("");
                                        DoStats(this->Instance, *(params[0].c_str()), source, results);
                                        for (size_t i = 0; i < results.size(); i++)
                                        {
                                                par[1] = "::" + results[i];
                                                Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
                                        }
                                }
                        }
                        else
                        {
                                /* Pass it on */
                                userrec* source = this->Instance->FindNick(prefix);
                                if (source)
                                        Utils->DoOneToOne(prefix, "STATS", params, params[1]);
                        }
                }
                return true;
        }


        /** Because the core won't let users or even SERVERS set +o,
         * we use the OPERTYPE command to do this.
         */
        bool OperType(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() != 1)
                {
                        Instance->Log(DEBUG,"Received invalid oper type from %s",prefix.c_str());
                        return true;
                }
                std::string opertype = params[0];
                userrec* u = this->Instance->FindNick(prefix);
                if (u)
                {
                        u->modes[UM_OPERATOR] = 1;
                        strlcpy(u->oper,opertype.c_str(),NICKMAX-1);
                        Utils->DoOneToAllButSender(u->nick,"OPERTYPE",params,u->server);
                        this->Instance->SNO->WriteToSnoMask('o',"From %s: User %s (%s@%s) is now an IRC operator of type %s",u->server, u->nick,u->ident,u->host,irc::Spacify(opertype.c_str()));

                }
                return true;
        }

        /** Because Andy insists that services-compatible servers must
         * implement SVSNICK and SVSJOIN, that's exactly what we do :p
         */
        bool ForceNick(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 3)
                        return true;

                userrec* u = this->Instance->FindNick(params[0]);

                if (u)
                {
                        Utils->DoOneToAllButSender(prefix,"SVSNICK",params,prefix);
                        if (IS_LOCAL(u))
                        {
                                std::deque<std::string> par;
                                par.push_back(params[1]);
                                /* This is not required as one is sent in OnUserPostNick below
                                 */
                                //Utils->DoOneToMany(u->nick,"NICK",par);
                                if (!u->ForceNickChange(params[1].c_str()))
                                {
                                        userrec::QuitUser(this->Instance, u, "Nickname collision");
                                        return true;
                                }
                                u->age = atoi(params[2].c_str());
                        }
                }
                return true;
        }

        /*
         * Remote SQUIT (RSQUIT). Routing works similar to SVSNICK: Route it to the server that the target is connected to locally,
         * then let that server do the dirty work (squit it!). Example:
         * A -> B -> C -> D: oper on A squits D, A routes to B, B routes to C, C notices D connected locally, kills it. -- w00t
         */
        bool RemoteSquit(const std::string &prefix, std::deque<std::string> &params)
        {
                /* ok.. :w00t RSQUIT jupe.barafranca.com :reason here */
                if (params.size() < 2)
                        return true;

                TreeServer* s = Utils->FindServerMask(params[0]);

                if (s)
                {
                        if (s == Utils->TreeRoot)
                        {
                                this->Instance->SNO->WriteToSnoMask('l',"What the fuck, I recieved a remote SQUIT for myself? :< (from %s", prefix.c_str());
                                return true;
                        }

                        TreeSocket* sock = s->GetSocket();

                        if (sock)
                        {
                                /* it's locally connected, KILL IT! */
                                Instance->Log(DEBUG,"Splitting server %s",s->GetName().c_str());
                                Instance->SNO->WriteToSnoMask('l',"RSQUIT: Server \002%s\002 removed from network by %s: %s", params[0].c_str(), prefix.c_str(), params[1].c_str());
                                sock->Squit(s,"Server quit by " + prefix + ": " + params[1]);
                                Instance->SE->DelFd(sock);
                                sock->Close();
                                delete sock;
                        }
                        else
                        {
                                /* route the rsquit */
                                params[1] = ":" + params[1];
                                Utils->DoOneToOne(prefix, "RSQUIT", params, params[0]);
                        }
                }
                else
                {
                        /* mother fucker! it doesn't exist */
                }

                return true;
        }

        bool ServiceJoin(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 2)
                        return true;

                userrec* u = this->Instance->FindNick(params[0]);

                if (u)
                {
                        chanrec::JoinUser(this->Instance, u, params[1].c_str(), false);
                        Utils->DoOneToAllButSender(prefix,"SVSJOIN",params,prefix);
                }
                return true;
        }

        bool RemoteRehash(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 1)
                        return false;

                std::string servermask = params[0];

                if (this->Instance->MatchText(this->Instance->Config->ServerName,servermask))
                {
                        this->Instance->SNO->WriteToSnoMask('l',"Remote rehash initiated from server \002"+prefix+"\002.");
                        this->Instance->RehashServer();
                        Utils->ReadConfiguration(false);
                        InitializeDisabledCommands(Instance->Config->DisabledCommands, Instance);
                }
                Utils->DoOneToAllButSender(prefix,"REHASH",params,prefix);
                return true;
        }

        bool RemoteKill(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() != 2)
                        return true;

                std::string nick = params[0];
                userrec* u = this->Instance->FindNick(prefix);
                userrec* who = this->Instance->FindNick(nick);

                if (who)
                {
                        /* Prepend kill source, if we don't have one */
                        std::string sourceserv = prefix;
                        if (u)
                        {
                                sourceserv = u->server;
                        }
                        if (*(params[1].c_str()) != '[')
                        {
                                params[1] = "[" + sourceserv + "] Killed (" + params[1] +")";
                        }
                        std::string reason = params[1];
                        params[1] = ":" + params[1];
                        Utils->DoOneToAllButSender(prefix,"KILL",params,sourceserv);
                        who->Write(":%s KILL %s :%s (%s)", sourceserv.c_str(), who->nick, sourceserv.c_str(), reason.c_str());
                        userrec::QuitUser(this->Instance,who,reason);
                }
                return true;
        }

        bool LocalPong(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 1)
                        return true;

                if (params.size() == 1)
                {
                        TreeServer* ServerSource = Utils->FindServer(prefix);
                        if (ServerSource)
                        {
                                ServerSource->SetPingFlag();
                        }
                }
                else
                {
                        std::string forwardto = params[1];
                        if (forwardto == this->Instance->Config->ServerName)
                        {
                                /*
                                 * this is a PONG for us
                                 * if the prefix is a user, check theyre local, and if they are,
                                 * dump the PONG reply back to their fd. If its a server, do nowt.
                                 * Services might want to send these s->s, but we dont need to yet.
                                 */
                                userrec* u = this->Instance->FindNick(prefix);

                                if (u)
                                {
                                        u->WriteServ("PONG %s %s",params[0].c_str(),params[1].c_str());
                                }
                        }
                        else
                        {
                                // not for us, pass it on :)
                                Utils->DoOneToOne(prefix,"PONG",params,forwardto);
                        }
                }

                return true;
        }
        
        bool MetaData(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 3)
                        return true;

                TreeServer* ServerSource = Utils->FindServer(prefix);

                if (ServerSource)
                {
                        if (params[0] == "*")
                        {
                                FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_OTHER,NULL,params[1],params[2]));
                        }
                        else if (*(params[0].c_str()) == '#')
                        {
                                chanrec* c = this->Instance->FindChan(params[0]);
                                if (c)
                                {
                                        FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_CHANNEL,c,params[1],params[2]));
                                }
                        }
                        else if (*(params[0].c_str()) != '#')
                        {
                                userrec* u = this->Instance->FindNick(params[0]);
                                if (u)
                                {
                                        FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_USER,u,params[1],params[2]));
                                }
                        }
                }

                params[2] = ":" + params[2];
                Utils->DoOneToAllButSender(prefix,"METADATA",params,prefix);
                return true;
        }

        bool ServerVersion(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 1)
                        return true;

                TreeServer* ServerSource = Utils->FindServer(prefix);

                if (ServerSource)
                {
                        ServerSource->SetVersion(params[0]);
                }
                params[0] = ":" + params[0];
                Utils->DoOneToAllButSender(prefix,"VERSION",params,prefix);
                return true;
        }

        bool ChangeHost(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 1)
                        return true;

                userrec* u = this->Instance->FindNick(prefix);

                if (u)
                {
                        u->ChangeDisplayedHost(params[0].c_str());
                        Utils->DoOneToAllButSender(prefix,"FHOST",params,u->server);
                }
                return true;
        }

        bool AddLine(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 6)
                        return true;

                bool propogate = false;

                switch (*(params[0].c_str()))
                {
                        case 'Z':
                                propogate = Instance->XLines->add_zline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
                                Instance->XLines->zline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
                        break;
                        case 'Q':
                                propogate = Instance->XLines->add_qline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
                                Instance->XLines->qline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
                        break;
                        case 'E':
                                propogate = Instance->XLines->add_eline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
                                Instance->XLines->eline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
                        break;
                        case 'G':
                                propogate = Instance->XLines->add_gline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
                                Instance->XLines->gline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
                        break;
                        case 'K':
                                propogate = Instance->XLines->add_kline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
                        break;
                        default:
                                /* Just in case... */
                                this->Instance->SNO->WriteToSnoMask('x',"\2WARNING\2: Invalid xline type '"+params[0]+"' sent by server "+prefix+", ignored!");
                                propogate = false;
                        break;
                }

                /* Send it on its way */
                if (propogate)
                {
                        if (atoi(params[4].c_str()))
                        {
                                this->Instance->SNO->WriteToSnoMask('x',"%s Added %cLINE on %s to expire in %lu seconds (%s).",prefix.c_str(),*(params[0].c_str()),params[1].c_str(),atoi(params[4].c_str()),params[5].c_str());
                        }
                        else
                        {
                                this->Instance->SNO->WriteToSnoMask('x',"%s Added permenant %cLINE on %s (%s).",prefix.c_str(),*(params[0].c_str()),params[1].c_str(),params[5].c_str());
                        }
                        params[5] = ":" + params[5];
                        Utils->DoOneToAllButSender(prefix,"ADDLINE",params,prefix);
                }
                if (!this->bursting)
                {
                        Instance->Log(DEBUG,"Applying lines...");
                        Instance->XLines->apply_lines(APPLY_ZLINES|APPLY_GLINES|APPLY_QLINES);
                }
                return true;
        }

        bool ChangeName(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 1)
                        return true;

                userrec* u = this->Instance->FindNick(prefix);

                if (u)
                {
                        u->ChangeName(params[0].c_str());
                        params[0] = ":" + params[0];
                        Utils->DoOneToAllButSender(prefix,"FNAME",params,u->server);
                }
                return true;
        }

        bool Whois(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 1)
                        return true;

                Instance->Log(DEBUG,"In IDLE command");
                userrec* u = this->Instance->FindNick(prefix);

                if (u)
                {
                        Instance->Log(DEBUG,"USER EXISTS: %s",u->nick);
                        // an incoming request
                        if (params.size() == 1)
                        {
                                userrec* x = this->Instance->FindNick(params[0]);
                                if ((x) && (IS_LOCAL(x)))
                                {
                                        userrec* x = this->Instance->FindNick(params[0]);
                                        char signon[MAXBUF];
                                        char idle[MAXBUF];

                                        snprintf(signon,MAXBUF,"%lu",(unsigned long)x->signon);
                                        snprintf(idle,MAXBUF,"%lu",(unsigned long)abs((x->idle_lastmsg)-Instance->Time(true)));
                                        std::deque<std::string> par;
                                        par.push_back(prefix);
                                        par.push_back(signon);
                                        par.push_back(idle);
                                        // ours, we're done, pass it BACK
                                        Utils->DoOneToOne(params[0],"IDLE",par,u->server);
                                }
                                else
                                {
                                        // not ours pass it on
                                        Utils->DoOneToOne(prefix,"IDLE",params,x->server);
                                }
                        }
                        else if (params.size() == 3)
                        {
                                std::string who_did_the_whois = params[0];
                                userrec* who_to_send_to = this->Instance->FindNick(who_did_the_whois);
                                if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
                                {
                                        // an incoming reply to a whois we sent out
                                        std::string nick_whoised = prefix;
                                        unsigned long signon = atoi(params[1].c_str());
                                        unsigned long idle = atoi(params[2].c_str());
                                        if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
                                                do_whois(this->Instance,who_to_send_to,u,signon,idle,nick_whoised.c_str());
                                }
                                else
                                {
                                        // not ours, pass it on
                                        Utils->DoOneToOne(prefix,"IDLE",params,who_to_send_to->server);
                                }
                        }
                }
                return true;
        }

        bool Push(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 2)
                        return true;

                userrec* u = this->Instance->FindNick(params[0]);

                if (!u)
                        return true;

                if (IS_LOCAL(u))
                {
                        u->Write(params[1]);
                }
                else
                {
                        // continue the raw onwards
                        params[1] = ":" + params[1];
                        Utils->DoOneToOne(prefix,"PUSH",params,u->server);
                }
                return true;
        }

        bool HandleSetTime(const std::string &prefix, std::deque<std::string> &params)
        {
                if (!params.size() || !Utils->EnableTimeSync)
                        return true;
                
                bool force = false;
                
                if ((params.size() == 2) && (params[1] == "FORCE"))
                        force = true;
                
                time_t rts = atoi(params[0].c_str());
                time_t us = Instance->Time(true);
                
                if (rts == us)
                {
                        Instance->Log(DEBUG, "Timestamp from %s is equal", prefix.c_str());
                        
                        Utils->DoOneToAllButSender(prefix, "TIMESET", params, prefix);
                }
                else if (force || (rts < us))
                {
                        int old = Instance->SetTimeDelta(rts - us);
                        Instance->Log(DEBUG, "%s TS (diff %d) from %s applied (old delta was %d)", (force) ? "Forced" : "Lower", rts - us, prefix.c_str(), old);
                        
                        Utils->DoOneToAllButSender(prefix, "TIMESET", params, prefix);
                }
                else
                {
                        Instance->Log(DEBUG, "Higher TS (diff %d) from %s overridden", us - rts, prefix.c_str());
                        
                        std::deque<std::string> oparams;
                        oparams.push_back(ConvToStr(us));
                        
                        Utils->DoOneToMany(prefix, "TIMESET", oparams);
                }
                
                return true;
        }

        bool Time(const std::string &prefix, std::deque<std::string> &params)
        {
                // :source.server TIME remote.server sendernick
                // :remote.server TIME source.server sendernick TS
                if (params.size() == 2)
                {
                        // someone querying our time?
                        if (this->Instance->Config->ServerName == params[0])
                        {
                                userrec* u = this->Instance->FindNick(params[1]);
                                if (u)
                                {
                                        params.push_back(ConvToStr(Instance->Time(false)));
                                        params[0] = prefix;
                                        Utils->DoOneToOne(this->Instance->Config->ServerName,"TIME",params,params[0]);
                                }
                        }
                        else
                        {
                                // not us, pass it on
                                userrec* u = this->Instance->FindNick(params[1]);
                                if (u)
                                        Utils->DoOneToOne(prefix,"TIME",params,params[0]);
                        }
                }
                else if (params.size() == 3)
                {
                        // a response to a previous TIME
                        userrec* u = this->Instance->FindNick(params[1]);
                        if ((u) && (IS_LOCAL(u)))
                        {
                        time_t rawtime = atol(params[2].c_str());
                        struct tm * timeinfo;
                        timeinfo = localtime(&rawtime);
                                char tms[26];
                                snprintf(tms,26,"%s",asctime(timeinfo));
                                tms[24] = 0;
                        u->WriteServ("391 %s %s :%s",u->nick,prefix.c_str(),tms);
                        }
                        else
                        {
                                if (u)
                                        Utils->DoOneToOne(prefix,"TIME",params,u->server);
                        }
                }
                return true;
        }
        
        bool LocalPing(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 1)
                        return true;

                if (params.size() == 1)
                {
                        std::string stufftobounce = params[0];
                        this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" PONG "+stufftobounce);
                        return true;
                }
                else
                {
                        std::string forwardto = params[1];
                        if (forwardto == this->Instance->Config->ServerName)
                        {
                                // this is a ping for us, send back PONG to the requesting server
                                params[1] = params[0];
                                params[0] = forwardto;
                                Utils->DoOneToOne(forwardto,"PONG",params,params[1]);
                        }
                        else
                        {
                                // not for us, pass it on :)
                                Utils->DoOneToOne(prefix,"PING",params,forwardto);
                        }
                        return true;
                }
        }

        bool RemoveStatus(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 1)
                        return true;

                chanrec* c = Instance->FindChan(params[0]);

                if (c)
                {
                        irc::modestacker modestack(false);
                        CUList *ulist = c->GetUsers();
                        const char* y[127];
                        std::deque<std::string> stackresult;
                        std::string x;

                        for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
                        {
                                std::string modesequence = Instance->Modes->ModeString(i->second, c);
                                if (modesequence.length())
                                {
                                        Instance->Log(DEBUG,"Mode sequence = '%s'",modesequence.c_str());
                                        irc::spacesepstream sep(modesequence);
                                        std::string modeletters = sep.GetToken();
                                        Instance->Log(DEBUG,"Mode letters = '%s'",modeletters.c_str());
                                        
                                        while (!modeletters.empty())
                                        {
                                                char mletter = *(modeletters.begin());
                                                modestack.Push(mletter,sep.GetToken());
                                                Instance->Log(DEBUG,"Push letter = '%c'",mletter);
                                                modeletters.erase(modeletters.begin());
                                                Instance->Log(DEBUG,"Mode letters = '%s'",modeletters.c_str());
                                        }
                                }
                        }

                        while (modestack.GetStackedLine(stackresult))
                        {
                                Instance->Log(DEBUG,"Stacked line size %d",stackresult.size());
                                stackresult.push_front(ConvToStr(c->age));
                                stackresult.push_front(c->name);
                                // dont echo this out, at best its just going to be bounced back -- Brain
                                //Utils->DoOneToMany(Instance->Config->ServerName, "FMODE", stackresult);
                                stackresult.erase(stackresult.begin() + 1);
                                Instance->Log(DEBUG,"Stacked items:");
                                for (size_t z = 0; z < stackresult.size(); z++)
                                {
                                        y[z] = stackresult[z].c_str();
                                        Instance->Log(DEBUG,"\tstackresult[%d]='%s'",z,stackresult[z].c_str());
                                }
                                userrec* n = new userrec(Instance);
                                n->SetFd(FD_MAGIC_NUMBER);
                                Instance->SendMode(y, stackresult.size(), n);
                                delete n;
                        }
                }
                return true;
        }

        bool RemoteServer(const std::string &prefix, std::deque<std::string> &params)
        {
                if (params.size() < 4)
                        return false;

                std::string servername = params[0];
                std::string password = params[1];
                // hopcount is not used for a remote server, we calculate this ourselves
                std::string description = params[3];
                TreeServer* ParentOfThis = Utils->FindServer(prefix);

                if (!ParentOfThis)
                {
                        this->WriteLine("ERROR :Protocol error - Introduced remote server from unknown server "+prefix);
                        return false;
                }
                TreeServer* CheckDupe = Utils->FindServer(servername);
                if (CheckDupe)
                {
                        this->WriteLine("ERROR :Server "+servername+" already exists!");
                        this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+servername+"\2 denied, already exists");
                        return false;
                }
                TreeServer* Node = new TreeServer(this->Utils,this->Instance,servername,description,ParentOfThis,NULL);
                ParentOfThis->AddChild(Node);
                params[3] = ":" + params[3];
                Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
                this->Instance->SNO->WriteToSnoMask('l',"Server \002"+prefix+"\002 introduced server \002"+servername+"\002 ("+description+")");
                return true;
        }

        bool Outbound_Reply_Server(std::deque<std::string> &params)
        {
                if (params.size() < 4)
                        return false;

                irc::string servername = params[0].c_str();
                std::string sname = params[0];
                std::string password = params[1];
                int hops = atoi(params[2].c_str());

                if (hops)
                {
                        this->WriteLine("ERROR :Server too far away for authentication");
                        this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
                        return false;
                }
                std::string description = params[3];
                for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
                {
                        if ((x->Name == servername) && (x->RecvPass == password))
                        {
                                TreeServer* CheckDupe = Utils->FindServer(sname);
                                if (CheckDupe)
                                {
                                        this->WriteLine("ERROR :Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
                                        this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
                                        return false;
                                }
                                // Begin the sync here. this kickstarts the
                                // other side, waiting in WAIT_AUTH_2 state,
                                // into starting their burst, as it shows
                                // that we're happy.
                                this->LinkState = CONNECTED;
                                // we should add the details of this server now
                                // to the servers tree, as a child of the root
                                // node.
                                TreeServer* Node = new TreeServer(this->Utils,this->Instance,sname,description,Utils->TreeRoot,this);
                                Utils->TreeRoot->AddChild(Node);
                                params[3] = ":" + params[3];
                                Utils->DoOneToAllButSender(Utils->TreeRoot->GetName(),"SERVER",params,sname);
                                this->bursting = true;
                                this->DoBurst(Node);
                                return true;
                        }
                }
                this->WriteLine("ERROR :Invalid credentials");
                this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
                return false;
        }

        bool Inbound_Server(std::deque<std::string> &params)
        {
                if (params.size() < 4)
                        return false;

                irc::string servername = params[0].c_str();
                std::string sname = params[0];
                std::string password = params[1];
                int hops = atoi(params[2].c_str());

                if (hops)
                {
                        this->WriteLine("ERROR :Server too far away for authentication");
                        this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
                        return false;
                }
                std::string description = params[3];
                for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
                {
                        if ((x->Name == servername) && (x->RecvPass == password))
                        {
                                TreeServer* CheckDupe = Utils->FindServer(sname);
                                if (CheckDupe)
                                {
                                        this->WriteLine("ERROR :Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
                                        this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
                                        return false;
                                }
                                this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");

                                if (this->Hook)
                                {
                                        std::string name = InspSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
                                        this->Instance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
                                }

                                this->InboundServerName = sname;
                                this->InboundDescription = description;
                                // this is good. Send our details: Our server name and description and hopcount of 0,
                                // along with the sendpass from this block.
                                this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+x->SendPass+" 0 :"+this->Instance->Config->ServerDesc);
                                // move to the next state, we are now waiting for THEM.
                                this->LinkState = WAIT_AUTH_2;
                                return true;
                        }
                }
                this->WriteLine("ERROR :Invalid credentials");
                this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
                return false;
        }

        void Split(const std::string &line, std::deque<std::string> &n)
        {
                n.clear();
                irc::tokenstream tokens(line);
                std::string param;
                while ((param = tokens.GetToken()) != "")
                        n.push_back(param);
                return;
        }

        bool ProcessLine(std::string &line)
        {
                std::deque<std::string> params;
                irc::string command;
                std::string prefix;
                
                line = line.substr(0, line.find_first_of("\r\n"));
                
                if (line.empty())
                        return true;
                
                Instance->Log(DEBUG,"IN: %s", line.c_str());
                
                this->Split(line.c_str(),params);
                        
                if ((params[0][0] == ':') && (params.size() > 1))
                {
                        prefix = params[0].substr(1);
                        params.pop_front();
                }

                command = params[0].c_str();
                params.pop_front();

                switch (this->LinkState)
                {
                        TreeServer* Node;
                        
                        case WAIT_AUTH_1:
                                // Waiting for SERVER command from remote server. Server initiating
                                // the connection sends the first SERVER command, listening server
                                // replies with theirs if its happy, then if the initiator is happy,
                                // it starts to send its net sync, which starts the merge, otherwise
                                // it sends an ERROR.
                                if (command == "PASS")
                                {
                                        /* Silently ignored */
                                }
                                else if (command == "SERVER")
                                {
                                        return this->Inbound_Server(params);
                                }
                                else if (command == "ERROR")
                                {
                                        return this->Error(params);
                                }
                                else if (command == "USER")
                                {
                                        this->WriteLine("ERROR :Client connections to this port are prohibited.");
                                        return false;
                                }
                                else if (command == "CAPAB")
                                {
                                        return this->Capab(params);
                                }
                                else if ((command == "U") || (command == "S"))
                                {
                                        this->WriteLine("ERROR :Cannot use the old-style mesh linking protocol with m_spanningtree.so!");
                                        return false;
                                }
                                else
                                {
                                        std::string error("ERROR :Invalid command in negotiation phase: ");
                                        error.append(command.c_str());
                                        this->WriteLine(error);
                                        return false;
                                }
                        break;
                        case WAIT_AUTH_2:
                                // Waiting for start of other side's netmerge to say they liked our
                                // password.
                                if (command == "SERVER")
                                {
                                        // cant do this, they sent it to us in the WAIT_AUTH_1 state!
                                        // silently ignore.
                                        return true;
                                }
                                else if ((command == "U") || (command == "S"))
                                {
                                        this->WriteLine("ERROR :Cannot use the old-style mesh linking protocol with m_spanningtree.so!");
                                        return false;
                                }
                                else if (command == "BURST")
                                {
                                        if (params.size() && Utils->EnableTimeSync)
                                        {
                                                /* If a time stamp is provided, apply synchronization */
                                                bool force = false;
                                                time_t them = atoi(params[0].c_str());
                                                time_t us = Instance->Time(true);
                                                int delta = them - us;

                                                if ((params.size() == 2) && (params[1] == "FORCE"))
                                                        force = true;

                                                if ((delta < -600) || (delta > 600))
                                                {
                                                        this->Instance->SNO->WriteToSnoMask('l',"\2ERROR\2: Your clocks are out by %d seconds (this is more than ten minutes). Link aborted, \2PLEASE SYNC YOUR CLOCKS!\2",abs(delta));
                                                        this->WriteLine("ERROR :Your clocks are out by "+ConvToStr(abs(delta))+" seconds (this is more than ten minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
                                                        return false;
                                                }
                                                
                                                if (us == them)
                                                {
                                                        this->Instance->Log(DEBUG, "Timestamps are equal; pat yourself on the back");
                                                }
                                                else if (force || (us > them))
                                                {
                                                        this->Instance->Log(DEBUG, "Remote server has lower TS (%d seconds)", them - us);
                                                        this->Instance->SetTimeDelta(them - us);
                                                        // Send this new timestamp to any other servers
                                                        Utils->DoOneToMany(Utils->TreeRoot->GetName(), "TIMESET", params);
                                                }
                                                else
                                                {
                                                        // Override the timestamp
                                                        this->Instance->Log(DEBUG, "We have a higher timestamp (by %d seconds), not updating delta", us - them);
                                                        this->WriteLine(":" + Utils->TreeRoot->GetName() + " TIMESET " + ConvToStr(us));
                                                }
                                        }
                                        this->LinkState = CONNECTED;
                                        Node = new TreeServer(this->Utils,this->Instance,InboundServerName,InboundDescription,Utils->TreeRoot,this);
                                        Utils->TreeRoot->AddChild(Node);
                                        params.clear();
                                        params.push_back(InboundServerName);
                                        params.push_back("*");
                                        params.push_back("1");
                                        params.push_back(":"+InboundDescription);
                                        Utils->DoOneToAllButSender(Utils->TreeRoot->GetName(),"SERVER",params,InboundServerName);
                                        this->bursting = true;
                                        this->DoBurst(Node);
                                }
                                else if (command == "ERROR")
                                {
                                        return this->Error(params);
                                }
                                else if (command == "CAPAB")
                                {
                                        return this->Capab(params);
                                }
                                
                        break;
                        case LISTENER:
                                this->WriteLine("ERROR :Internal error -- listening socket accepted its own descriptor!!!");
                                return false;
                        break;
                        case CONNECTING:
                                if (command == "SERVER")
                                {
                                        // another server we connected to, which was in WAIT_AUTH_1 state,
                                        // has just sent us their credentials. If we get this far, theyre
                                        // happy with OUR credentials, and they are now in WAIT_AUTH_2 state.
                                        // if we're happy with this, we should send our netburst which
                                        // kickstarts the merge.
                                        return this->Outbound_Reply_Server(params);
                                }
                                else if (command == "ERROR")
                                {
                                        return this->Error(params);
                                }
                        break;
                        case CONNECTED:
                                // This is the 'authenticated' state, when all passwords
                                // have been exchanged and anything past this point is taken
                                // as gospel.
                                
                                if (prefix != "")
                                {
                                        std::string direction = prefix;
                                        userrec* t = this->Instance->FindNick(prefix);
                                        if (t)
                                        {
                                                direction = t->server;
                                        }
                                        TreeServer* route_back_again = Utils->BestRouteTo(direction);
                                        if ((!route_back_again) || (route_back_again->GetSocket() != this))
                                        {
                                                if (route_back_again)
                                                        Instance->Log(DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
                                                return true;
                                        }

                                        /* Fix by brain:
                                         * When there is activity on the socket, reset the ping counter so
                                         * that we're not wasting bandwidth pinging an active server.
                                         */ 
                                        route_back_again->SetNextPingTime(time(NULL) + 60);
                                        route_back_again->SetPingFlag();
                                }
                                
                                if (command == "SVSMODE")
                                {
                                        /* Services expects us to implement
                                         * SVSMODE. In inspircd its the same as
                                         * MODE anyway.
                                         */
                                        command = "MODE";
                                }
                                std::string target = "";
                                /* Yes, know, this is a mess. Its reasonably fast though as we're
                                 * working with std::string here.
                                 */
                                if ((command == "NICK") && (params.size() > 1))
                                {
                                        return this->IntroduceClient(prefix,params);
                                }
                                else if (command == "FJOIN")
                                {
                                        return this->ForceJoin(prefix,params);
                                }
                                else if (command == "STATS")
                                {
                                        return this->Stats(prefix, params);
                                }
                                else if (command == "MOTD")
                                {
                                        return this->Motd(prefix, params);
                                }
                                else if (command == "ADMIN")
                                {
                                        return this->Admin(prefix, params);
                                }
                                else if (command == "SERVER")
                                {
                                        return this->RemoteServer(prefix,params);
                                }
                                else if (command == "ERROR")
                                {
                                        return this->Error(params);
                                }
                                else if (command == "OPERTYPE")
                                {
                                        return this->OperType(prefix,params);
                                }
                                else if (command == "FMODE")
                                {
                                        return this->ForceMode(prefix,params);
                                }
                                else if (command == "KILL")
                                {
                                        return this->RemoteKill(prefix,params);
                                }
                                else if (command == "FTOPIC")
                                {
                                        return this->ForceTopic(prefix,params);
                                }
                                else if (command == "REHASH")
                                {
                                        return this->RemoteRehash(prefix,params);
                                }
                                else if (command == "METADATA")
                                {
                                        return this->MetaData(prefix,params);
                                }
                                else if (command == "REMSTATUS")
                                {
                                        return this->RemoveStatus(prefix,params);
                                }
                                else if (command == "PING")
                                {
                                        /*
                                         * We just got a ping from a server that's bursting.
                                         * This can't be right, so set them to not bursting, and
                                         * apply their lines.
                                         */
                                        if (this->bursting)
                                        {
                                                this->bursting = false;
                                                Instance->XLines->apply_lines(APPLY_ZLINES|APPLY_GLINES|APPLY_QLINES);
                                        }
                                        if (prefix == "")
                                        {
                                                prefix = this->GetName();
                                        }
                                        return this->LocalPing(prefix,params);
                                }
                                else if (command == "PONG")
                                {
                                        /*
                                         * We just got a pong from a server that's bursting.
                                         * This can't be right, so set them to not bursting, and
                                         * apply their lines.
                                         */
                                        if (this->bursting)
                                        {
                                                this->bursting = false;
                                                Instance->XLines->apply_lines(APPLY_ZLINES|APPLY_GLINES|APPLY_QLINES);
                                        }
                                        if (prefix == "")
                                        {
                                                prefix = this->GetName();
                                        }
                                        return this->LocalPong(prefix,params);
                                }
                                else if (command == "VERSION")
                                {
                                        return this->ServerVersion(prefix,params);
                                }
                                else if (command == "FHOST")
                                {
                                        return this->ChangeHost(prefix,params);
                                }
                                else if (command == "FNAME")
                                {
                                        return this->ChangeName(prefix,params);
                                }
                                else if (command == "ADDLINE")
                                {
                                        return this->AddLine(prefix,params);
                                }
                                else if (command == "SVSNICK")
                                {
                                        if (prefix == "")
                                        {
                                                prefix = this->GetName();
                                        }
                                        return this->ForceNick(prefix,params);
                                }
                                else if (command == "RSQUIT")
                                {
                                        return this->RemoteSquit(prefix, params);
                                }
                                else if (command == "IDLE")
                                {
                                        return this->Whois(prefix,params);
                                }
                                else if (command == "PUSH")
                                {
                                        return this->Push(prefix,params);
                                }
                                else if (command == "TIMESET")
                                {
                                        return this->HandleSetTime(prefix, params);
                                }
                                else if (command == "TIME")
                                {
                                        return this->Time(prefix,params);
                                }
                                else if ((command == "KICK") && (Utils->IsServer(prefix)))
                                {
                                        std::string sourceserv = this->myhost;
                                        if (params.size() == 3)
                                        {
                                                userrec* user = this->Instance->FindNick(params[1]);
                                                chanrec* chan = this->Instance->FindChan(params[0]);
                                                if (user && chan)
                                                {
                                                        if (!chan->ServerKickUser(user, params[2].c_str(), false))
                                                                /* Yikes, the channels gone! */
                                                                delete chan;
                                                }
                                        }
                                        if (this->InboundServerName != "")
                                        {
                                                sourceserv = this->InboundServerName;
                                        }
                                        return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
                                }
                                else if (command == "SVSJOIN")
                                {
                                        if (prefix == "")
                                        {
                                                prefix = this->GetName();
                                        }
                                        return this->ServiceJoin(prefix,params);
                                }
                                else if (command == "SQUIT")
                                {
                                        if (params.size() == 2)
                                        {
                                                this->Squit(Utils->FindServer(params[0]),params[1]);
                                        }
                                        return true;
                                }
                                else if (command == "OPERNOTICE")
                                {
                                        std::string sourceserv = this->myhost;

                                        if (this->InboundServerName != "")
                                                sourceserv = this->InboundServerName;

                                        if (params.size() >= 1)
                                                Instance->WriteOpers("*** From " + sourceserv + ": " + params[0]);

                                        return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
                                }
                                else if (command == "MODENOTICE")
                                {
                                        std::string sourceserv = this->myhost;
                                        if (this->InboundServerName != "")
                                                sourceserv = this->InboundServerName;
                                        if (params.size() >= 2)
                                        {
                                                Instance->WriteMode(params[0].c_str(), WM_AND, "*** From %s: %s", sourceserv.c_str(), params[1].c_str());
                                        }

                                        return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
                                }
                                else if (command == "SNONOTICE")
                                {
                                        std::string sourceserv = this->myhost;
                                        if (this->InboundServerName != "")
                                                sourceserv = this->InboundServerName;
                                        if (params.size() >= 2)
                                        {
                                                Instance->SNO->WriteToSnoMask(*(params[0].c_str()), "From " + sourceserv + ": "+ params[1]);
                                        }

                                        return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
                                }
                                else if (command == "ENDBURST")
                                {
                                        this->bursting = false;
                                        Instance->XLines->apply_lines(APPLY_ZLINES|APPLY_GLINES|APPLY_QLINES);
                                        std::string sourceserv = this->myhost;
                                        if (this->InboundServerName != "")
                                        {
                                                sourceserv = this->InboundServerName;
                                        }
                                        this->Instance->SNO->WriteToSnoMask('l',"Received end of netburst from \2%s\2",sourceserv.c_str());

                                        Event rmode((char*)sourceserv.c_str(), (Module*)Utils->Creator, "new_server");
                                        rmode.Send(Instance);

                                        return true;
                                }
                                else
                                {
                                        // not a special inter-server command.
                                        // Emulate the actual user doing the command,
                                        // this saves us having a huge ugly parser.
                                        userrec* who = this->Instance->FindNick(prefix);
                                        std::string sourceserv = this->myhost;
                                        if (this->InboundServerName != "")
                                        {
                                                sourceserv = this->InboundServerName;
                                        }
                                        if ((!who) && (command == "MODE"))
                                        {
                                                if (Utils->IsServer(prefix))
                                                {
                                                        const char* modelist[127];
                                                        for (size_t i = 0; i < params.size(); i++)
                                                                modelist[i] = params[i].c_str();

                                                        userrec* fake = new userrec(Instance);
                                                        fake->SetFd(FD_MAGIC_NUMBER);

                                                        this->Instance->SendMode(modelist, params.size(), fake);
        
                                                        delete fake;

                                                        /* Hot potato! pass it on! */
                                                        return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
                                                }
                                        }
                                        if (who)
                                        {
                                                if ((command == "NICK") && (params.size() > 0))
                                                {
                                                        /* On nick messages, check that the nick doesnt
                                                         * already exist here. If it does, kill their copy,
                                                         * and our copy.
                                                         */
                                                        userrec* x = this->Instance->FindNick(params[0]);
                                                        if ((x) && (x != who))
                                                        {
                                                                std::deque<std::string> p;
                                                                p.push_back(params[0]);
                                                                p.push_back("Nickname collision ("+prefix+" -> "+params[0]+")");
                                                                Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
                                                                p.clear();
                                                                p.push_back(prefix);
                                                                p.push_back("Nickname collision");
                                                                Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
                                                                userrec::QuitUser(this->Instance,x,"Nickname collision ("+prefix+" -> "+params[0]+")");
                                                                userrec* y = this->Instance->FindNick(prefix);
                                                                if (y)
                                                                {
                                                                        userrec::QuitUser(this->Instance,y,"Nickname collision");
                                                                }
                                                                return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
                                                        }
                                                }
                                                // its a user
                                                target = who->server;
                                                const char* strparams[127];
                                                for (unsigned int q = 0; q < params.size(); q++)
                                                {
                                                        strparams[q] = params[q].c_str();
                                                }
                                                switch (this->Instance->CallCommandHandler(command.c_str(), strparams, params.size(), who))
                                                {
                                                        case CMD_INVALID:
                                                                this->WriteLine("ERROR :Unrecognised command '"+std::string(command.c_str())+"' -- possibly loaded mismatched modules");
                                                                return false;
                                                        break;
                                                        case CMD_FAILURE:
                                                                return true;
                                                        break;
                                                        default:
                                                                /* CMD_SUCCESS and CMD_USER_DELETED fall through here */
                                                        break;
                                                }
                                        }
                                        else
                                        {
                                                // its not a user. Its either a server, or somethings screwed up.
                                                if (Utils->IsServer(prefix))
                                                {
                                                        target = this->Instance->Config->ServerName;
                                                }
                                                else
                                                {
                                                        Instance->Log(DEBUG,"Command with unknown origin '%s'",prefix.c_str());
                                                        return true;
                                                }
                                        }
                                        return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);

                                }
                                return true;
                        break;
                }
                return true;
        }

        virtual std::string GetName()
        {
                std::string sourceserv = this->myhost;
                if (this->InboundServerName != "")
                {
                        sourceserv = this->InboundServerName;
                }
                return sourceserv;
        }

        virtual void OnTimeout()
        {
                if (this->LinkState == CONNECTING)
                {
                        this->Instance->SNO->WriteToSnoMask('l',"CONNECT: Connection to \002"+myhost+"\002 timed out.");
                        Link* MyLink = Utils->FindLink(myhost);
                        if (MyLink)
                                Utils->DoFailOver(MyLink);
                }
        }

        virtual void OnClose()
        {
                // Connection closed.
                // If the connection is fully up (state CONNECTED)
                // then propogate a netsplit to all peers.
                std::string quitserver = this->myhost;
                if (this->InboundServerName != "")
                {
                        quitserver = this->InboundServerName;
                }
                TreeServer* s = Utils->FindServer(quitserver);
                if (s)
                {
                        Squit(s,"Remote host closed the connection");
                }

                if (quitserver != "")
                        this->Instance->SNO->WriteToSnoMask('l',"Connection to '\2%s\2' failed.",quitserver.c_str());
        }

        virtual int OnIncomingConnection(int newsock, char* ip)
        {
                /* To prevent anyone from attempting to flood opers/DDoS by connecting to the server port,
                 * or discovering if this port is the server port, we don't allow connections from any
                 * IPs for which we don't have a link block.
                 */
                bool found = false;

                found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
                if (!found)
                {
                        for (vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
                                if (irc::sockets::MatchCIDR(ip, (*i).c_str()))
                                        found = true;

                        if (!found)
                        {
                                this->Instance->SNO->WriteToSnoMask('l',"Server connection from %s denied (no link blocks with that IP address)", ip);
                                close(newsock);
                                return false;
                        }
                }

                TreeSocket* s = new TreeSocket(this->Utils, this->Instance, newsock, ip, this->Hook);

                s = s; /* Whinge whinge whinge, thats all GCC ever does. */
                return true;
        }
};

/** This class is used to resolve server hostnames during /connect and autoconnect.
 * As of 1.1, the resolver system is seperated out from InspSocket, so we must do this
 * resolver step first ourselves if we need it. This is totally nonblocking, and will
 * callback to OnLookupComplete or OnError when completed. Once it has completed we
 * will have an IP address which we can then use to continue our connection.
 */
class ServernameResolver : public Resolver
{       
 private:
        /** A copy of the Link tag info for what we're connecting to.
         * We take a copy, rather than using a pointer, just in case the
         * admin takes the tag away and rehashes while the domain is resolving.
         */
        Link MyLink;
        SpanningTreeUtilities* Utils;
 public: 
        ServernameResolver(Module* me, SpanningTreeUtilities* Util, InspIRCd* Instance, const std::string &hostname, Link x) : Resolver(Instance, hostname, DNS_QUERY_FORWARD, me), MyLink(x), Utils(Util)
        {
                /* Nothing in here, folks */
        }

        void OnLookupComplete(const std::string &result)
        {
                /* Initiate the connection, now that we have an IP to use.
                 * Passing a hostname directly to InspSocket causes it to
                 * just bail and set its FD to -1.
                 */
                TreeServer* CheckDupe = Utils->FindServer(MyLink.Name.c_str());
                if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
                {

                        if ((!MyLink.Hook.empty()) && (Utils->hooks.find(MyLink.Hook.c_str()) ==  Utils->hooks.end()))
                                return;

                        TreeSocket* newsocket = new TreeSocket(this->Utils, ServerInstance, result,MyLink.Port,false,MyLink.Timeout ? MyLink.Timeout : 10,MyLink.Name.c_str(),
                                        MyLink.Hook.empty() ? NULL : Utils->hooks[MyLink.Hook.c_str()]);
                        if (newsocket->GetFd() > -1)
                        {
                                /* We're all OK */
                        }
                        else
                        {
                                /* Something barfed, show the opers */
                                ServerInstance->SNO->WriteToSnoMask('l',"CONNECT: Error connecting \002%s\002: %s.",MyLink.Name.c_str(),strerror(errno));
                                delete newsocket;
                                Utils->DoFailOver(&MyLink);
                        }
                }
        }

        void OnError(ResolverError e, const std::string &errormessage)
        {
                /* Ooops! */
                ServerInstance->SNO->WriteToSnoMask('l',"CONNECT: Error connecting \002%s\002: Unable to resolve hostname - %s",MyLink.Name.c_str(),errormessage.c_str());
                Utils->DoFailOver(&MyLink);
        }
};

/** Handle resolving of server IPs for the cache
 */
class SecurityIPResolver : public Resolver
{
 private:
        Link MyLink;
        SpanningTreeUtilities* Utils;
 public:
        SecurityIPResolver(Module* me, SpanningTreeUtilities* U, InspIRCd* Instance, const std::string &hostname, Link x) : Resolver(Instance, hostname, DNS_QUERY_FORWARD, me), MyLink(x), Utils(U)
        {
        }

        void OnLookupComplete(const std::string &result)
        {
                ServerInstance->Log(DEBUG,"Security IP cache: Adding IP address '%s' for Link '%s'",result.c_str(),MyLink.Name.c_str());
                Utils->ValidIPs.push_back(result);
        }

        void OnError(ResolverError e, const std::string &errormessage)
        {
                ServerInstance->Log(DEBUG,"Could not resolve IP associated with Link '%s': %s",MyLink.Name.c_str(),errormessage.c_str());
        }
};

SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
{
        Bindings.clear();

        this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc);

        modulelist* ml = ServerInstance->FindInterface("InspSocketHook");

        /* Did we find any modules? */
        if (ml)
        {
                /* Yes, enumerate them all to find out the hook name */
                for (modulelist::iterator m = ml->begin(); m != ml->end(); m++)
                {
                        /* Make a request to it for its name, its implementing
                         * InspSocketHook so we know its safe to do this
                         */
                        std::string name = InspSocketNameRequest((Module*)Creator, *m).Send();
                        /* Build a map of them */
                        hooks[name.c_str()] = *m;
                        hooknames.push_back(name);
                        ServerInstance->Log(DEBUG, "Found InspSocketHook interface: '%s' -> '%08x'", name.c_str(), *m);
                }
        }

        this->ReadConfiguration(true);
}

SpanningTreeUtilities::~SpanningTreeUtilities()
{
        for (unsigned int i = 0; i < Bindings.size(); i++)
        {
                ServerInstance->Log(DEBUG,"Freeing binding %d of %d",i, Bindings.size());
                ServerInstance->SE->DelFd(Bindings[i]);
                Bindings[i]->Close();
                DELETE(Bindings[i]);
        }
        ServerInstance->Log(DEBUG,"Freeing connected servers...");
        while (TreeRoot->ChildCount())
        {
                TreeServer* child_server = TreeRoot->GetChild(0);
                ServerInstance->Log(DEBUG,"Freeing connected server %s", child_server->GetName().c_str());
                if (child_server)
                {
                        TreeSocket* sock = child_server->GetSocket();
                        ServerInstance->SE->DelFd(sock);
                        sock->Close();
                        DELETE(sock);
                }
        }
        delete TreeRoot;
}

void SpanningTreeUtilities::AddThisServer(TreeServer* server, TreeServerList &list)
{
        if (list.find(server) == list.end())
                list[server] = server;
}

/** returns a list of DIRECT servernames for a specific channel */
void SpanningTreeUtilities::GetListOfServersForChannel(chanrec* c, TreeServerList &list, char status, const CUList &exempt_list)
{
        CUList *ulist;
        switch (status)
        {
                case '@':
                        ulist = c->GetOppedUsers();
                break;
                case '%':
                        ulist = c->GetHalfoppedUsers();
                break;
                case '+':
                        ulist = c->GetVoicedUsers();
                break;
                default:
                        ulist = c->GetUsers();
                break;
        }
        for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
        {
                if ((i->second->GetFd() < 0) && (exempt_list.find(i->second) == exempt_list.end()))
                {
                        TreeServer* best = this->BestRouteTo(i->second->server);
                        if (best)
                                AddThisServer(best,list);
                }
        }
        return;
}

bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
{
        char pfx = 0;
        TreeServer* omitroute = this->BestRouteTo(omit);
        if ((command == "NOTICE") || (command == "PRIVMSG"))
        {
                if (params.size() >= 2)
                {
                        /* Prefixes */
                        if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
                        {
                                pfx = params[0][0];
                                params[0] = params[0].substr(1, params[0].length()-1);
                        }
                        if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
                        {
                                // special routing for private messages/notices
                                userrec* d = ServerInstance->FindNick(params[0]);
                                if (d)
                                {
                                        std::deque<std::string> par;
                                        par.push_back(params[0]);
                                        par.push_back(":"+params[1]);
                                        this->DoOneToOne(prefix,command.c_str(),par,d->server);
                                        return true;
                                }
                        }
                        else if (*(params[0].c_str()) == '$')
                        {
                                std::deque<std::string> par;
                                par.push_back(params[0]);
                                par.push_back(":"+params[1]);
                                this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
                                return true;
                        }
                        else
                        {
                                chanrec* c = ServerInstance->FindChan(params[0]);
                                userrec* u = ServerInstance->FindNick(prefix);
                                if (c && u)
                                {
                                        CUList elist;
                                        TreeServerList list;
                                        FOREACH_MOD(I_OnBuildExemptList, OnBuildExemptList((command == "PRIVMSG" ? MSG_PRIVMSG : MSG_NOTICE), c, u, pfx, elist));
                                        GetListOfServersForChannel(c,list,pfx,elist);

                                        for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
                                        {
                                                TreeSocket* Sock = i->second->GetSocket();
                                                if ((Sock) && (i->second->GetName() != omit) && (omitroute != i->second))
                                                {
                                                        Sock->WriteLine(data);
                                                }
                                        }
                                        return true;
                                }
                        }
                }
        }
        unsigned int items =this->TreeRoot->ChildCount();
        for (unsigned int x = 0; x < items; x++)
        {
                TreeServer* Route = this->TreeRoot->GetChild(x);
                if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
                {
                        TreeSocket* Sock = Route->GetSocket();
                        if (Sock)
                                Sock->WriteLine(data);
                }
        }
        return true;
}

bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
{
        TreeServer* omitroute = this->BestRouteTo(omit);
        std::string FullLine = ":" + prefix + " " + command;
        unsigned int words = params.size();
        for (unsigned int x = 0; x < words; x++)
        {
                FullLine = FullLine + " " + params[x];
        }
        unsigned int items = this->TreeRoot->ChildCount();
        for (unsigned int x = 0; x < items; x++)
        {
                TreeServer* Route = this->TreeRoot->GetChild(x);
                // Send the line IF:
                // The route has a socket (its a direct connection)
                // The route isnt the one to be omitted
                // The route isnt the path to the one to be omitted
                if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
                {
                        TreeSocket* Sock = Route->GetSocket();
                        if (Sock)
                                Sock->WriteLine(FullLine);
                }
        }
        return true;
}

bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
{
        std::string FullLine = ":" + prefix + " " + command;
        unsigned int words = params.size();
        for (unsigned int x = 0; x < words; x++)
        {
                FullLine = FullLine + " " + params[x];
        }
        unsigned int items = this->TreeRoot->ChildCount();
        for (unsigned int x = 0; x < items; x++)
        {
                TreeServer* Route = this->TreeRoot->GetChild(x);
                if (Route && Route->GetSocket())
                {
                        TreeSocket* Sock = Route->GetSocket();
                        if (Sock)
                                Sock->WriteLine(FullLine);
                }
        }
        return true;
}

bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
{
        std::string spfx = prefix;
        std::string scmd = command;
        return this->DoOneToMany(spfx, scmd, params);
}

bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
{
        std::string spfx = prefix;
        std::string scmd = command;
        return this->DoOneToAllButSender(spfx, scmd, params, omit);
}
        
bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
{
        TreeServer* Route = this->BestRouteTo(target);
        if (Route)
        {
                std::string FullLine = ":" + prefix + " " + command;
                unsigned int words = params.size();
                for (unsigned int x = 0; x < words; x++)
                {
                        FullLine = FullLine + " " + params[x];
                }
                if (Route && Route->GetSocket())
                {
                        TreeSocket* Sock = Route->GetSocket();
                        if (Sock)
                                Sock->WriteLine(FullLine);
                }
                return true;
        }
        else
        {
                return false;
        }
}

void SpanningTreeUtilities::ReadConfiguration(bool rebind)
{
        ConfigReader* Conf = new ConfigReader(ServerInstance);
        if (rebind)
        {
                for (int j =0; j < Conf->Enumerate("bind"); j++)
                {
                        std::string Type = Conf->ReadValue("bind","type",j);
                        std::string IP = Conf->ReadValue("bind","address",j);
                        std::string Port = Conf->ReadValue("bind","port",j);
                        std::string transport = Conf->ReadValue("bind","transport",j);
                        if (Type == "servers")
                        {
                                irc::portparser portrange(Port, false);
                                int portno = -1;
                                while ((portno = portrange.GetToken()))
                                {
                                        ServerInstance->Log(DEBUG,"m_spanningtree: Binding server port %s:%d", IP.c_str(), portno);
                                        if (IP == "*")
                                                IP = "";

                                        if ((!transport.empty()) && (hooks.find(transport.c_str()) ==  hooks.end()))
                                        {
                                                ServerInstance->Log(DEFAULT,"m_spanningtree: WARNING: Can't find transport type '%s' for port %s:%s - maybe you forgot to load it BEFORE m_spanningtree in your config file? - Skipping this port binding",
                                                                transport.c_str(), IP.c_str(), Port.c_str());
                                                break;
                                        }

                                        TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(), portno, true, 10, transport.empty() ? NULL : hooks[transport.c_str()]);
                                        if (listener->GetState() == I_LISTENING)
                                        {
                                                ServerInstance->Log(DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), portno);
                                                Bindings.push_back(listener);
                                        }
                                        else
                                        {
                                                ServerInstance->Log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port %s:%d",IP.c_str(), portno);
                                                listener->Close();
                                                DELETE(listener);
                                        }
                                        ServerInstance->Log(DEBUG,"Done with this binding");
                                }
                        }
                }
        }
        FlatLinks = Conf->ReadFlag("options","flatlinks",0);
        HideULines = Conf->ReadFlag("options","hideulines",0);
        AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
        EnableTimeSync = !(Conf->ReadFlag("options","notimesync",0));
        LinkBlocks.clear();
        ValidIPs.clear();
        for (int j =0; j < Conf->Enumerate("link"); j++)
        {
                Link L;
                std::string Allow = Conf->ReadValue("link","allowmask",j);
                L.Name = (Conf->ReadValue("link","name",j)).c_str();
                L.IPAddr = Conf->ReadValue("link","ipaddr",j);
                L.FailOver = Conf->ReadValue("link","failover",j).c_str();
                L.Port = Conf->ReadInteger("link","port",j,true);
                L.SendPass = Conf->ReadValue("link","sendpass",j);
                L.RecvPass = Conf->ReadValue("link","recvpass",j);
                L.AutoConnect = Conf->ReadInteger("link","autoconnect",j,true);
                L.HiddenFromStats = Conf->ReadFlag("link","hidden",j);
                L.Timeout = Conf->ReadInteger("link","timeout",j,true);
                L.Hook = Conf->ReadValue("link", "transport", j);

                if ((!L.Hook.empty()) && (hooks.find(L.Hook.c_str()) ==  hooks.end()))
                {
                        ServerInstance->Log(DEFAULT,"m_spanningtree: WARNING: Can't find transport type '%s' for link '%s' - maybe you forgot to load it BEFORE m_spanningtree in your config file? Skipping <link> tag completely.",
                                        L.Hook.c_str(), L.Name.c_str());
                        continue;

                }

                L.NextConnectTime = time(NULL) + L.AutoConnect;
                /* Bugfix by brain, do not allow people to enter bad configurations */
                if (L.Name != ServerInstance->Config->ServerName)
                {
                        if ((L.IPAddr != "") && (L.RecvPass != "") && (L.SendPass != "") && (L.Name != "") && (L.Port))
                        {
                                ValidIPs.push_back(L.IPAddr);

                                if (Allow.length())
                                        ValidIPs.push_back(Allow);

                                /* Needs resolving */
                                insp_inaddr binip;
                                if (insp_aton(L.IPAddr.c_str(), &binip) < 1)
                                {
                                        try
                                        {
                                                SecurityIPResolver* sr = new SecurityIPResolver((Module*)this->Creator, this, ServerInstance, L.IPAddr, L);
                                                ServerInstance->AddResolver(sr);
                                        }
                                        catch (ModuleException& e)
                                        {
                                                ServerInstance->Log(DEBUG,"Error in resolver: %s",e.GetReason());
                                        }
                                }

                                LinkBlocks.push_back(L);
                                ServerInstance->Log(DEBUG,"m_spanningtree: Read server %s with host %s:%d",L.Name.c_str(),L.IPAddr.c_str(),L.Port);
                        }
                        else
                        {
                                if (L.IPAddr == "")
                                {
                                        ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', IP address not defined!",L.Name.c_str());
                                }
                                else if (L.RecvPass == "")
                                {
                                        ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', recvpass not defined!",L.Name.c_str());
                                }
                                else if (L.SendPass == "")
                                {
                                        ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', sendpass not defined!",L.Name.c_str());
                                }
                                else if (L.Name == "")
                                {
                                        ServerInstance->Log(DEFAULT,"Invalid configuration, link tag without a name!");
                                }
                                else if (!L.Port)
                                {
                                        ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', no port specified!",L.Name.c_str());
                                }
                        }
                }
                else
                {
                        ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', link tag has the same server name as the local server!",L.Name.c_str());
                }
        }
        DELETE(Conf);
}

/** To create a timer which recurs every second, we inherit from InspTimer.
 * InspTimer is only one-shot however, so at the end of each Tick() we simply
 * insert another of ourselves into the pending queue :)
 */
class TimeSyncTimer : public InspTimer
{
 private:
        InspIRCd *Instance;
        ModuleSpanningTree *Module;
 public:
        TimeSyncTimer(InspIRCd *Instance, ModuleSpanningTree *Mod);
        virtual void Tick(time_t TIME);
};

HandshakeTimer::HandshakeTimer(InspIRCd* Inst, TreeSocket* s, Link* l, SpanningTreeUtilities* u) : InspTimer(1, time(NULL)), Instance(Inst), sock(s), lnk(l), Utils(u)
{
        thefd = sock->GetFd();
}

void HandshakeTimer::Tick(time_t TIME)
{
        if (Instance->SE->GetRef(thefd) == sock)
        {
                if (sock->GetHook() && InspSocketHSCompleteRequest(sock, (Module*)Utils->Creator, sock->GetHook()).Send())
                {
                        Instance->Log(DEBUG,"Handshake timer activated, sending SERVER and/or CAPAB");
                        InspSocketAttachCertRequest(sock, (Module*)Utils->Creator, sock->GetHook()).Send();
                        sock->SendCapabilities();
                        if (sock->GetLinkState() == CONNECTING)
                        {
                                sock->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+lnk->SendPass+" 0 :"+this->Instance->Config->ServerDesc);
                        }
                }
                else
                {
                        Instance->Timers->AddTimer(new HandshakeTimer(Instance, sock, lnk, Utils));
                }
        }
}

class ModuleSpanningTree : public Module
{
        int line;
        int NumServers;
        unsigned int max_local;
        unsigned int max_global;
        cmd_rconnect* command_rconnect;
        SpanningTreeUtilities* Utils;

 public:
        TimeSyncTimer *SyncTimer;

        ModuleSpanningTree(InspIRCd* Me)
                : Module::Module(Me), max_local(0), max_global(0)
        {
                ServerInstance->UseInterface("InspSocketHook");

                Utils = new SpanningTreeUtilities(Me, this);

                command_rconnect = new cmd_rconnect(ServerInstance, this, Utils);
                ServerInstance->AddCommand(command_rconnect);

                if (Utils->EnableTimeSync)
                {
                        SyncTimer = new TimeSyncTimer(ServerInstance, this);
                        ServerInstance->Timers->AddTimer(SyncTimer);
                }
                else
                        SyncTimer = NULL;
        }

        void ShowLinks(TreeServer* Current, userrec* user, int hops)
        {
                std::string Parent = Utils->TreeRoot->GetName();
                if (Current->GetParent())
                {
                        Parent = Current->GetParent()->GetName();
                }
                for (unsigned int q = 0; q < Current->ChildCount(); q++)
                {
                        if ((Utils->HideULines) && (ServerInstance->ULine(Current->GetChild(q)->GetName().c_str())))
                        {
                                if (*user->oper)
                                {
                                         ShowLinks(Current->GetChild(q),user,hops+1);
                                }
                        }
                        else
                        {
                                ShowLinks(Current->GetChild(q),user,hops+1);
                        }
                }
                /* Don't display the line if its a uline, hide ulines is on, and the user isnt an oper */
                if ((Utils->HideULines) && (ServerInstance->ULine(Current->GetName().c_str())) && (!*user->oper))
                        return;
                user->WriteServ("364 %s %s %s :%d %s",user->nick,Current->GetName().c_str(),(Utils->FlatLinks && (!*user->oper)) ? ServerInstance->Config->ServerName : Parent.c_str(),(Utils->FlatLinks && (!*user->oper)) ? 0 : hops,Current->GetDesc().c_str());
        }

        int CountLocalServs()
        {
                return Utils->TreeRoot->ChildCount();
        }

        int CountServs()
        {
                return Utils->serverlist.size();
        }

        void HandleLinks(const char** parameters, int pcnt, userrec* user)
        {
                ShowLinks(Utils->TreeRoot,user,0);
                user->WriteServ("365 %s * :End of /LINKS list.",user->nick);
                return;
        }

        void HandleLusers(const char** parameters, int pcnt, userrec* user)
        {
                unsigned int n_users = ServerInstance->UserCount();

                /* Only update these when someone wants to see them, more efficient */
                if ((unsigned int)ServerInstance->LocalUserCount() > max_local)
                        max_local = ServerInstance->LocalUserCount();
                if (n_users > max_global)
                        max_global = n_users;

                unsigned int ulined_count = 0;
                unsigned int ulined_local_count = 0;

                /* If ulined are hidden and we're not an oper, count the number of ulined servers hidden,
                 * locally and globally (locally means directly connected to us)
                 */
                if ((Utils->HideULines) && (!*user->oper))
                {
                        for (server_hash::iterator q = Utils->serverlist.begin(); q != Utils->serverlist.end(); q++)
                        {
                                if (ServerInstance->ULine(q->second->GetName().c_str()))
                                {
                                        ulined_count++;
                                        if (q->second->GetParent() == Utils->TreeRoot)
                                                ulined_local_count++;
                                }
                        }
                }

                user->WriteServ("251 %s :There are %d users and %d invisible on %d servers",user->nick,n_users-ServerInstance->InvisibleUserCount(),ServerInstance->InvisibleUserCount(),ulined_count ? this->CountServs() - ulined_count : this->CountServs());
                if (ServerInstance->OperCount())
                        user->WriteServ("252 %s %d :operator(s) online",user->nick,ServerInstance->OperCount());
                if (ServerInstance->UnregisteredUserCount())
                        user->WriteServ("253 %s %d :unknown connections",user->nick,ServerInstance->UnregisteredUserCount());
                if (ServerInstance->ChannelCount())
                        user->WriteServ("254 %s %d :channels formed",user->nick,ServerInstance->ChannelCount());
                user->WriteServ("254 %s :I have %d clients and %d servers",user->nick,ServerInstance->LocalUserCount(),ulined_local_count ? this->CountLocalServs() - ulined_local_count : this->CountLocalServs());
                user->WriteServ("265 %s :Current Local Users: %d  Max: %d",user->nick,ServerInstance->LocalUserCount(),max_local);
                user->WriteServ("266 %s :Current Global Users: %d  Max: %d",user->nick,n_users,max_global);
                return;
        }

        // WARNING: NOT THREAD SAFE - DONT GET ANY SMART IDEAS.

        void ShowMap(TreeServer* Current, userrec* user, int depth, char matrix[128][80], float &totusers, float &totservers)
        {
                if (line < 128)
                {
                        for (int t = 0; t < depth; t++)
                        {
                                matrix[line][t] = ' ';
                        }

                        // For Aligning, we need to work out exactly how deep this thing is, and produce
                        // a 'Spacer' String to compensate.
                        char spacer[40];

                        memset(spacer,' ',40);
                        if ((40 - Current->GetName().length() - depth) > 1) {
                                spacer[40 - Current->GetName().length() - depth] = '\0';
                        }
                        else
                        {
                                spacer[5] = '\0';
                        }

                        float percent;
                        char text[80];
                        if (ServerInstance->clientlist->size() == 0) {
                                // If there are no users, WHO THE HELL DID THE /MAP?!?!?!
                                percent = 0;
                        }
                        else
                        {
                                percent = ((float)Current->GetUserCount() / (float)ServerInstance->clientlist->size()) * 100;
                        }
                        snprintf(text, 80, "%s %s%5d [%5.2f%%]", Current->GetName().c_str(), spacer, Current->GetUserCount(), percent);
                        totusers += Current->GetUserCount();
                        totservers++;
                        strlcpy(&matrix[line][depth],text,80);
                        line++;
                        for (unsigned int q = 0; q < Current->ChildCount(); q++)
                        {
                                if ((Utils->HideULines) && (ServerInstance->ULine(Current->GetChild(q)->GetName().c_str())))
                                {
                                        if (*user->oper)
                                        {
                                                ShowMap(Current->GetChild(q),user,(Utils->FlatLinks && (!*user->oper)) ? depth : depth+2,matrix,totusers,totservers);
                                        }
                                }
                                else
                                {
                                        ShowMap(Current->GetChild(q),user,(Utils->FlatLinks && (!*user->oper)) ? depth : depth+2,matrix,totusers,totservers);
                                }
                        }
                }
        }

        int HandleMotd(const char** parameters, int pcnt, userrec* user)
        {
                if (pcnt > 0)
                {
                        /* Remote MOTD, the server is within the 1st parameter */
                        std::deque<std::string> params;
                        params.push_back(parameters[0]);

                        /* Send it out remotely, generate no reply yet */
                        TreeServer* s = Utils->FindServerMask(parameters[0]);
                        if (s)
                        {
                                Utils->DoOneToOne(user->nick, "MOTD", params, s->GetName());
                        }
                        else
                        {
                                user->WriteServ( "402 %s %s :No such server", user->nick, parameters[0]);
                        }
                        return 1;
                }
                return 0;
        }

        int HandleAdmin(const char** parameters, int pcnt, userrec* user)
        {
                if (pcnt > 0)
                {
                        /* Remote ADMIN, the server is within the 1st parameter */
                        std::deque<std::string> params;
                        params.push_back(parameters[0]);

                        /* Send it out remotely, generate no reply yet */
                        TreeServer* s = Utils->FindServerMask(parameters[0]);
                        if (s)
                        {
                                Utils->DoOneToOne(user->nick, "ADMIN", params, s->GetName());
                        }
                        else
                        {
                                user->WriteServ( "402 %s %s :No such server", user->nick, parameters[0]);
                        }
                        return 1;
                }
                return 0;
        }

        int HandleStats(const char** parameters, int pcnt, userrec* user)
        {
                if (pcnt > 1)
                {
                        /* Remote STATS, the server is within the 2nd parameter */
                        std::deque<std::string> params;
                        params.push_back(parameters[0]);
                        params.push_back(parameters[1]);
                        /* Send it out remotely, generate no reply yet */
                        TreeServer* s = Utils->FindServerMask(parameters[1]);
                        if (s)
                        {
                                params[1] = s->GetName();
                                Utils->DoOneToOne(user->nick, "STATS", params, s->GetName());
                        }
                        else
                        {
                                user->WriteServ( "402 %s %s :No such server", user->nick, parameters[0]);
                        }
                        return 1;
                }
                return 0;
        }

        // Ok, prepare to be confused.
        // After much mulling over how to approach this, it struck me that
        // the 'usual' way of doing a /MAP isnt the best way. Instead of
        // keeping track of a ton of ascii characters, and line by line
        // under recursion working out where to place them using multiplications
        // and divisons, we instead render the map onto a backplane of characters
        // (a character matrix), then draw the branches as a series of "L" shapes
        // from the nodes. This is not only friendlier on CPU it uses less stack.

        void HandleMap(const char** parameters, int pcnt, userrec* user)
        {
                // This array represents a virtual screen which we will
                // "scratch" draw to, as the console device of an irc
                // client does not provide for a proper terminal.
                float totusers = 0;
                float totservers = 0;
                char matrix[128][80];
                for (unsigned int t = 0; t < 128; t++)
                {
                        matrix[t][0] = '\0';
                }
                line = 0;
                // The only recursive bit is called here.
                ShowMap(Utils->TreeRoot,user,0,matrix,totusers,totservers);
                // Process each line one by one. The algorithm has a limit of
                // 128 servers (which is far more than a spanning tree should have
                // anyway, so we're ok). This limit can be raised simply by making
                // the character matrix deeper, 128 rows taking 10k of memory.
                for (int l = 1; l < line; l++)
                {
                        // scan across the line looking for the start of the
                        // servername (the recursive part of the algorithm has placed
                        // the servers at indented positions depending on what they
                        // are related to)
                        int first_nonspace = 0;
                        while (matrix[l][first_nonspace] == ' ')
                        {
                                first_nonspace++;
                        }
                        first_nonspace--;
                        // Draw the `- (corner) section: this may be overwritten by
                        // another L shape passing along the same vertical pane, becoming
                        // a |- (branch) section instead.
                        matrix[l][first_nonspace] = '-';
                        matrix[l][first_nonspace-1] = '`';
                        int l2 = l - 1;
                        // Draw upwards until we hit the parent server, causing possibly
                        // other corners (`-) to become branches (|-)
                        while ((matrix[l2][first_nonspace-1] == ' ') || (matrix[l2][first_nonspace-1] == '`'))
                        {
                                matrix[l2][first_nonspace-1] = '|';
                                l2--;
                        }
                }
                // dump the whole lot to the user. This is the easy bit, honest.
                for (int t = 0; t < line; t++)
                {
                        user->WriteServ("006 %s :%s",user->nick,&matrix[t][0]);
                }
                float avg_users = totusers / totservers;
                user->WriteServ("270 %s :%.0f server%s and %.0f user%s, average %.2f users per server",user->nick,totservers,(totservers > 1 ? "s" : ""),totusers,(totusers > 1 ? "s" : ""),avg_users);
        user->WriteServ("007 %s :End of /MAP",user->nick);
                return;
        }

        int HandleSquit(const char** parameters, int pcnt, userrec* user)
        {
                TreeServer* s = Utils->FindServerMask(parameters[0]);
                if (s)
                {
                        if (s == Utils->TreeRoot)
                        {
                                user->WriteServ("NOTICE %s :*** SQUIT: Foolish mortal, you cannot make a server SQUIT itself! (%s matches local server name)",user->nick,parameters[0]);
                                return 1;
                        }
                        TreeSocket* sock = s->GetSocket();
                        if (sock)
                        {
                                ServerInstance->Log(DEBUG,"Splitting server %s",s->GetName().c_str());
                                ServerInstance->SNO->WriteToSnoMask('l',"SQUIT: Server \002%s\002 removed from network by %s",parameters[0],user->nick);
                                sock->Squit(s,std::string("Server quit by ") + user->GetFullRealHost());
                                ServerInstance->SE->DelFd(sock);
                                sock->Close();
                                delete sock;
                        }
                        else
                        {
                                /* route it */
                                std::deque<std::string> params;
                                params.push_back(parameters[0]);
                                params.push_back(std::string(":Server quit by ") + user->GetFullRealHost());
                                Utils->DoOneToOne(user->nick, "RSQUIT", params, parameters[0]);
                        }
                }
                else
                {
                         user->WriteServ("NOTICE %s :*** SQUIT: The server \002%s\002 does not exist on the network.",user->nick,parameters[0]);
                }
                return 1;
        }

        int HandleTime(const char** parameters, int pcnt, userrec* user)
        {
                if ((IS_LOCAL(user)) && (pcnt))
                {
                        TreeServer* found = Utils->FindServerMask(parameters[0]);
                        if (found)
                        {
                                // we dont' override for local server
                                if (found == Utils->TreeRoot)
                                        return 0;
                                
                                std::deque<std::string> params;
                                params.push_back(found->GetName());
                                params.push_back(user->nick);
                                Utils->DoOneToOne(ServerInstance->Config->ServerName,"TIME",params,found->GetName());
                        }
                        else
                        {
                                user->WriteServ("402 %s %s :No such server",user->nick,parameters[0]);
                        }
                }
                return 1;
        }

        int HandleRemoteWhois(const char** parameters, int pcnt, userrec* user)
        {
                if ((IS_LOCAL(user)) && (pcnt > 1))
                {
                        userrec* remote = ServerInstance->FindNick(parameters[1]);
                        if ((remote) && (remote->GetFd() < 0))
                        {
                                std::deque<std::string> params;
                                params.push_back(parameters[1]);
                                Utils->DoOneToOne(user->nick,"IDLE",params,remote->server);
                                return 1;
                        }
                        else if (!remote)
                        {
                                user->WriteServ("401 %s %s :No such nick/channel",user->nick, parameters[1]);
                                user->WriteServ("318 %s %s :End of /WHOIS list.",user->nick, parameters[1]);
                                return 1;
                        }
                }
                return 0;
        }

        void DoPingChecks(time_t curtime)
        {
                for (unsigned int j = 0; j < Utils->TreeRoot->ChildCount(); j++)
                {
                        TreeServer* serv = Utils->TreeRoot->GetChild(j);
                        TreeSocket* sock = serv->GetSocket();
                        if (sock)
                        {
                                if (curtime >= serv->NextPingTime())
                                {
                                        if (serv->AnsweredLastPing())
                                        {
                                                sock->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" PING "+serv->GetName());
                                                serv->SetNextPingTime(curtime + 60);
                                        }
                                        else
                                        {
                                                // they didnt answer, boot them
                                                ServerInstance->SNO->WriteToSnoMask('l',"Server \002%s\002 pinged out",serv->GetName().c_str());
                                                sock->Squit(serv,"Ping timeout");
                                                ServerInstance->SE->DelFd(sock);
                                                sock->Close();
                                                delete sock;
                                                return;
                                        }
                                }
                        }
                }
        }

        void ConnectServer(Link* x)
        {
                insp_inaddr binip;

                /* Do we already have an IP? If so, no need to resolve it. */
                if (insp_aton(x->IPAddr.c_str(), &binip) > 0)
                {
                        /* Gave a hook, but it wasnt one we know */
                        if ((!x->Hook.empty()) && (Utils->hooks.find(x->Hook.c_str()) == Utils->hooks.end()))
                                return;

                        TreeSocket* newsocket = new TreeSocket(Utils, ServerInstance, x->IPAddr,x->Port,false,x->Timeout ? x->Timeout : 10,x->Name.c_str(), x->Hook.empty() ? NULL : Utils->hooks[x->Hook.c_str()]);
                        if (newsocket->GetFd() > -1)
                        {
                                /* Handled automatically on success */
                        }
                        else
                        {
                                ServerInstance->SNO->WriteToSnoMask('l',"CONNECT: Error connecting \002%s\002: %s.",x->Name.c_str(),strerror(errno));
                                delete newsocket;
                                Utils->DoFailOver(x);
                        }
                }
                else
                {
                        try
                        {
                                ServernameResolver* snr = new ServernameResolver((Module*)this, Utils, ServerInstance,x->IPAddr, *x);
                                ServerInstance->AddResolver(snr);
                        }
                        catch (ModuleException& e)
                        {
                                ServerInstance->Log(DEBUG,"Error in resolver: %s",e.GetReason());
                                Utils->DoFailOver(x);
                        }
                }
        }

        void AutoConnectServers(time_t curtime)
        {
                for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
                {
                        if ((x->AutoConnect) && (curtime >= x->NextConnectTime))
                        {
                                ServerInstance->Log(DEBUG,"Auto-Connecting %s",x->Name.c_str());
                                x->NextConnectTime = curtime + x->AutoConnect;
                                TreeServer* CheckDupe = Utils->FindServer(x->Name.c_str());
                                if (x->FailOver.length())
                                {
                                        TreeServer* CheckFailOver = Utils->FindServer(x->FailOver.c_str());
                                        if (CheckFailOver)
                                        {
                                                /* The failover for this server is currently a member of the network.
                                                 * The failover probably succeeded, where the main link did not.
                                                 * Don't try the main link until the failover is gone again.
                                                 */
                                                continue;
                                        }
                                }
                                if (!CheckDupe)
                                {
                                        // an autoconnected server is not connected. Check if its time to connect it
                                        ServerInstance->SNO->WriteToSnoMask('l',"AUTOCONNECT: Auto-connecting server \002%s\002 (%lu seconds until next attempt)",x->Name.c_str(),x->AutoConnect);
                                        this->ConnectServer(&(*x));
                                }
                        }
                }
        }

        int HandleVersion(const char** parameters, int pcnt, userrec* user)
        {
                // we've already checked if pcnt > 0, so this is safe
                TreeServer* found = Utils->FindServerMask(parameters[0]);
                if (found)
                {
                        std::string Version = found->GetVersion();
                        user->WriteServ("351 %s :%s",user->nick,Version.c_str());
                        if (found == Utils->TreeRoot)
                        {
                                ServerInstance->Config->Send005(user);
                        }
                }
                else
                {
                        user->WriteServ("402 %s %s :No such server",user->nick,parameters[0]);
                }
                return 1;
        }
        
        int HandleConnect(const char** parameters, int pcnt, userrec* user)
        {
                for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
                {
                        if (ServerInstance->MatchText(x->Name.c_str(),parameters[0]))
                        {
                                TreeServer* CheckDupe = Utils->FindServer(x->Name.c_str());
                                if (!CheckDupe)
                                {
                                        user->WriteServ("NOTICE %s :*** CONNECT: Connecting to server: \002%s\002 (%s:%d)",user->nick,x->Name.c_str(),(x->HiddenFromStats ? "<hidden>" : x->IPAddr.c_str()),x->Port);
                                        ConnectServer(&(*x));
                                        return 1;
                                }
                                else
                                {
                                        user->WriteServ("NOTICE %s :*** CONNECT: Server \002%s\002 already exists on the network and is connected via \002%s\002",user->nick,x->Name.c_str(),CheckDupe->GetParent()->GetName().c_str());
                                        return 1;
                                }
                        }
                }
                user->WriteServ("NOTICE %s :*** CONNECT: No server matching \002%s\002 could be found in the config file.",user->nick,parameters[0]);
                return 1;
        }

        void BroadcastTimeSync()
        {
                std::deque<std::string> params;
                params.push_back(ConvToStr(ServerInstance->Time(true)));
                Utils->DoOneToMany(Utils->TreeRoot->GetName(), "TIMESET", params);
        }

        virtual int OnStats(char statschar, userrec* user, string_list &results)
        {
                if ((statschar == 'c') || (statschar == 'n'))
                {
                        for (unsigned int i = 0; i < Utils->LinkBlocks.size(); i++)
                        {
                                results.push_back(std::string(ServerInstance->Config->ServerName)+" 213 "+user->nick+" "+statschar+" *@"+(Utils->LinkBlocks[i].HiddenFromStats ? "<hidden>" : Utils->LinkBlocks[i].IPAddr)+" * "+Utils->LinkBlocks[i].Name.c_str()+" "+ConvToStr(Utils->LinkBlocks[i].Port)+" "+(Utils->LinkBlocks[i].Hook.empty() ? "plaintext" : Utils->LinkBlocks[i].Hook)+" "+(Utils->LinkBlocks[i].AutoConnect ? 'a' : '-')+'s');
                                if (statschar == 'c')
                                        results.push_back(std::string(ServerInstance->Config->ServerName)+" 244 "+user->nick+" H * * "+Utils->LinkBlocks[i].Name.c_str());
                        }
                        results.push_back(std::string(ServerInstance->Config->ServerName)+" 219 "+user->nick+" "+statschar+" :End of /STATS report");
                        ServerInstance->SNO->WriteToSnoMask('t',"Notice: %s '%c' requested by %s (%s@%s)",(!strcmp(user->server,ServerInstance->Config->ServerName) ? "Stats" : "Remote stats"),statschar,user->nick,user->ident,user->host);
                        return 1;
                }
                return 0;
        }

        virtual int OnPreCommand(const std::string &command, const char** parameters, int pcnt, userrec *user, bool validated, const std::string &original_line)
        {
                /* If the command doesnt appear to be valid, we dont want to mess with it. */
                if (!validated)
                        return 0;

                if (command == "CONNECT")
                {
                        return this->HandleConnect(parameters,pcnt,user);
                }
                else if (command == "STATS")
                {
                        return this->HandleStats(parameters,pcnt,user);
                }
                else if (command == "MOTD")
                {
                        return this->HandleMotd(parameters,pcnt,user);
                }
                else if (command == "ADMIN")
                {
                        return this->HandleAdmin(parameters,pcnt,user);
                }
                else if (command == "SQUIT")
                {
                        return this->HandleSquit(parameters,pcnt,user);
                }
                else if (command == "MAP")
                {
                        this->HandleMap(parameters,pcnt,user);
                        return 1;
                }
                else if ((command == "TIME") && (pcnt > 0))
                {
                        return this->HandleTime(parameters,pcnt,user);
                }
                else if (command == "LUSERS")
                {
                        this->HandleLusers(parameters,pcnt,user);
                        return 1;
                }
                else if (command == "LINKS")
                {
                        this->HandleLinks(parameters,pcnt,user);
                        return 1;
                }
                else if (command == "WHOIS")
                {
                        if (pcnt > 1)
                        {
                                // remote whois
                                return this->HandleRemoteWhois(parameters,pcnt,user);
                        }
                }
                else if ((command == "VERSION") && (pcnt > 0))
                {
                        this->HandleVersion(parameters,pcnt,user);
                        return 1;
                }

                return 0;
        }

        virtual void OnPostCommand(const std::string &command, const char** parameters, int pcnt, userrec *user, CmdResult result, const std::string &original_line)
        {
                if ((result == CMD_SUCCESS) && (ServerInstance->IsValidModuleCommand(command, pcnt, user)))
                {
                        // this bit of code cleverly routes all module commands
                        // to all remote severs *automatically* so that modules
                        // can just handle commands locally, without having
                        // to have any special provision in place for remote
                        // commands and linking protocols.
                        std::deque<std::string> params;
                        params.clear();
                        for (int j = 0; j < pcnt; j++)
                        {
                                if (strchr(parameters[j],' '))
                                {
                                        params.push_back(":" + std::string(parameters[j]));
                                }
                                else
                                {
                                        params.push_back(std::string(parameters[j]));
                                }
                        }
                        ServerInstance->Log(DEBUG,"Globally route '%s'",command.c_str());
                        Utils->DoOneToMany(user->nick,command,params);
                }
        }

        virtual void OnGetServerDescription(const std::string &servername,std::string &description)
        {
                TreeServer* s = Utils->FindServer(servername);
                if (s)
                {
                        description = s->GetDesc();
                }
        }

        virtual void OnUserInvite(userrec* source,userrec* dest,chanrec* channel)
        {
                if (IS_LOCAL(source))
                {
                        std::deque<std::string> params;
                        params.push_back(dest->nick);
                        params.push_back(channel->name);
                        Utils->DoOneToMany(source->nick,"INVITE",params);
                }
        }

        virtual void OnPostLocalTopicChange(userrec* user, chanrec* chan, const std::string &topic)
        {
                std::deque<std::string> params;
                params.push_back(chan->name);
                params.push_back(":"+topic);
                Utils->DoOneToMany(user->nick,"TOPIC",params);
        }

        virtual void OnWallops(userrec* user, const std::string &text)
        {
                if (IS_LOCAL(user))
                {
                        std::deque<std::string> params;
                        params.push_back(":"+text);
                        Utils->DoOneToMany(user->nick,"WALLOPS",params);
                }
        }

        virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status, const CUList &exempt_list)
        {
                if (target_type == TYPE_USER)
                {
                        userrec* d = (userrec*)dest;
                        if ((d->GetFd() < 0) && (IS_LOCAL(user)))
                        {
                                std::deque<std::string> params;
                                params.clear();
                                params.push_back(d->nick);
                                params.push_back(":"+text);
                                Utils->DoOneToOne(user->nick,"NOTICE",params,d->server);
                        }
                }
                else if (target_type == TYPE_CHANNEL)
                {
                        if (IS_LOCAL(user))
                        {
                                chanrec *c = (chanrec*)dest;
                                if (c)
                                {
                                        std::string cname = c->name;
                                        if (status)
                                                cname = status + cname;
                                        TreeServerList list;
                                        Utils->GetListOfServersForChannel(c,list,status,exempt_list);

                                        for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
                                        {
                                                TreeSocket* Sock = i->second->GetSocket();
                                                if (Sock)
                                                        Sock->WriteLine(":"+std::string(user->nick)+" NOTICE "+cname+" :"+text);
                                        }
                                }
                        }
                }
                else if (target_type == TYPE_SERVER)
                {
                        if (IS_LOCAL(user))
                        {
                                char* target = (char*)dest;
                                std::deque<std::string> par;
                                par.push_back(target);
                                par.push_back(":"+text);
                                Utils->DoOneToMany(user->nick,"NOTICE",par);
                        }
                }
        }

        virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status, const CUList &exempt_list)
        {
                if (target_type == TYPE_USER)
                {
                        // route private messages which are targetted at clients only to the server
                        // which needs to receive them
                        userrec* d = (userrec*)dest;
                        if ((d->GetFd() < 0) && (IS_LOCAL(user)))
                        {
                                std::deque<std::string> params;
                                params.clear();
                                params.push_back(d->nick);
                                params.push_back(":"+text);
                                Utils->DoOneToOne(user->nick,"PRIVMSG",params,d->server);
                        }
                }
                else if (target_type == TYPE_CHANNEL)
                {
                        if (IS_LOCAL(user))
                        {
                                chanrec *c = (chanrec*)dest;
                                if (c)
                                {
                                        std::string cname = c->name;
                                        if (status)
                                                cname = status + cname;
                                        TreeServerList list;
                                        Utils->GetListOfServersForChannel(c,list,status,exempt_list);

                                        for (TreeServerList::iterator i = list.begin(); i != list.end(); i++)
                                        {
                                                TreeSocket* Sock = i->second->GetSocket();
                                                if (Sock)
                                                        Sock->WriteLine(":"+std::string(user->nick)+" PRIVMSG "+cname+" :"+text);
                                        }
                                }
                        }
                }
                else if (target_type == TYPE_SERVER)
                {
                        if (IS_LOCAL(user))
                        {
                                char* target = (char*)dest;
                                std::deque<std::string> par;
                                par.push_back(target);
                                par.push_back(":"+text);
                                Utils->DoOneToMany(user->nick,"PRIVMSG",par);
                        }
                }
        }

        virtual void OnBackgroundTimer(time_t curtime)
        {
                AutoConnectServers(curtime);
                DoPingChecks(curtime);
        }

        virtual void OnUserJoin(userrec* user, chanrec* channel)
        {
                // Only do this for local users
                if (IS_LOCAL(user))
                {
                        if (channel->GetUserCounter() == 1)
                        {
                                std::deque<std::string> params;
                                // set up their permissions and the channel TS with FJOIN.
                                // All users are FJOINed now, because a module may specify
                                // new joining permissions for the user.
                                params.push_back(channel->name);
                                params.push_back(ConvToStr(channel->age));
                                params.push_back(std::string(channel->GetAllPrefixChars(user))+","+std::string(user->nick));
                                Utils->DoOneToMany(ServerInstance->Config->ServerName,"FJOIN",params);
                                /* First user in, sync the modes for the channel */
                                params.pop_back();
                                /* This is safe, all inspircd servers default to +nt */
                                params.push_back("+nt");
                                Utils->DoOneToMany(ServerInstance->Config->ServerName,"FMODE",params);
                        }
                        else
                        {
                                std::deque<std::string> params;
                                params.push_back(channel->name);
                                params.push_back(ConvToStr(channel->age));
                                Utils->DoOneToMany(user->nick,"JOIN",params);
                        }
                }
        }

        virtual void OnChangeHost(userrec* user, const std::string &newhost)
        {
                // only occurs for local clients
                if (user->registered != REG_ALL)
                        return;
                std::deque<std::string> params;
                params.push_back(newhost);
                Utils->DoOneToMany(user->nick,"FHOST",params);
        }

        virtual void OnChangeName(userrec* user, const std::string &gecos)
        {
                // only occurs for local clients
                if (user->registered != REG_ALL)
                        return;
                std::deque<std::string> params;
                params.push_back(gecos);
                Utils->DoOneToMany(user->nick,"FNAME",params);
        }

        virtual void OnUserPart(userrec* user, chanrec* channel, const std::string &partmessage)
        {
                if (IS_LOCAL(user))
                {
                        std::deque<std::string> params;
                        params.push_back(channel->name);
                        if (partmessage != "")
                                params.push_back(":"+partmessage);
                        Utils->DoOneToMany(user->nick,"PART",params);
                }
        }

        virtual void OnUserConnect(userrec* user)
        {
                char agestr[MAXBUF];
                if (IS_LOCAL(user))
                {
                        std::deque<std::string> params;
                        snprintf(agestr,MAXBUF,"%lu",(unsigned long)user->age);
                        params.push_back(agestr);
                        params.push_back(user->nick);
                        params.push_back(user->host);
                        params.push_back(user->dhost);
                        params.push_back(user->ident);
                        params.push_back("+"+std::string(user->FormatModes()));
                        params.push_back(user->GetIPString());
                        params.push_back(":"+std::string(user->fullname));
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"NICK",params);

                        // User is Local, change needs to be reflected!
                        TreeServer* SourceServer = Utils->FindServer(user->server);
                        if (SourceServer)
                        {
                                SourceServer->AddUserCount();
                        }

                }
        }

        virtual void OnUserQuit(userrec* user, const std::string &reason)
        {
                if ((IS_LOCAL(user)) && (user->registered == REG_ALL))
                {
                        std::deque<std::string> params;
                        params.push_back(":"+reason);
                        Utils->DoOneToMany(user->nick,"QUIT",params);
                }
                // Regardless, We need to modify the user Counts..
                TreeServer* SourceServer = Utils->FindServer(user->server);
                if (SourceServer)
                {
                        SourceServer->DelUserCount();
                }

        }

        virtual void OnUserPostNick(userrec* user, const std::string &oldnick)
        {
                if (IS_LOCAL(user))
                {
                        std::deque<std::string> params;
                        params.push_back(user->nick);
                        Utils->DoOneToMany(oldnick,"NICK",params);
                }
        }

        virtual void OnUserKick(userrec* source, userrec* user, chanrec* chan, const std::string &reason)
        {
                if ((source) && (IS_LOCAL(source)))
                {
                        std::deque<std::string> params;
                        params.push_back(chan->name);
                        params.push_back(user->nick);
                        params.push_back(":"+reason);
                        Utils->DoOneToMany(source->nick,"KICK",params);
                }
                else if (!source)
                {
                        std::deque<std::string> params;
                        params.push_back(chan->name);
                        params.push_back(user->nick);
                        params.push_back(":"+reason);
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"KICK",params);
                }
        }

        virtual void OnRemoteKill(userrec* source, userrec* dest, const std::string &reason)
        {
                std::deque<std::string> params;
                params.push_back(dest->nick);
                params.push_back(":"+reason);
                Utils->DoOneToMany(source->nick,"KILL",params);
        }

        virtual void OnRehash(const std::string &parameter)
        {
                if (parameter != "")
                {
                        std::deque<std::string> params;
                        params.push_back(parameter);
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"REHASH",params);
                        // check for self
                        if (ServerInstance->MatchText(ServerInstance->Config->ServerName,parameter))
                        {
                                ServerInstance->WriteOpers("*** Remote rehash initiated from server \002%s\002",ServerInstance->Config->ServerName);
                                ServerInstance->RehashServer();
                        }
                }
                Utils->ReadConfiguration(false);
        }

        // note: the protocol does not allow direct umode +o except
        // via NICK with 8 params. sending OPERTYPE infers +o modechange
        // locally.
        virtual void OnOper(userrec* user, const std::string &opertype)
        {
                if (IS_LOCAL(user))
                {
                        std::deque<std::string> params;
                        params.push_back(opertype);
                        Utils->DoOneToMany(user->nick,"OPERTYPE",params);
                }
        }

        void OnLine(userrec* source, const std::string &host, bool adding, char linetype, long duration, const std::string &reason)
        {
                if (!source)
                {
                        /* Server-set lines */
                        char data[MAXBUF];
                        snprintf(data,MAXBUF,"%c %s %s %lu %lu :%s", linetype, host.c_str(), ServerInstance->Config->ServerName, (unsigned long)ServerInstance->Time(false),
                                        (unsigned long)duration, reason.c_str());
                        std::deque<std::string> params;
                        params.push_back(data);
                        Utils->DoOneToMany(ServerInstance->Config->ServerName, "ADDLINE", params);
                }
                else
                {
                        if (IS_LOCAL(source))
                        {
                                char type[8];
                                snprintf(type,8,"%cLINE",linetype);
                                std::string stype = type;
                                if (adding)
                                {
                                        char sduration[MAXBUF];
                                        snprintf(sduration,MAXBUF,"%ld",duration);
                                        std::deque<std::string> params;
                                        params.push_back(host);
                                        params.push_back(sduration);
                                        params.push_back(":"+reason);
                                        Utils->DoOneToMany(source->nick,stype,params);
                                }
                                else
                                {
                                        std::deque<std::string> params;
                                        params.push_back(host);
                                        Utils->DoOneToMany(source->nick,stype,params);
                                }
                        }
                }
        }

        virtual void OnAddGLine(long duration, userrec* source, const std::string &reason, const std::string &hostmask)
        {
                OnLine(source,hostmask,true,'G',duration,reason);
        }
        
        virtual void OnAddZLine(long duration, userrec* source, const std::string &reason, const std::string &ipmask)
        {
                OnLine(source,ipmask,true,'Z',duration,reason);
        }

        virtual void OnAddQLine(long duration, userrec* source, const std::string &reason, const std::string &nickmask)
        {
                OnLine(source,nickmask,true,'Q',duration,reason);
        }

        virtual void OnAddELine(long duration, userrec* source, const std::string &reason, const std::string &hostmask)
        {
                OnLine(source,hostmask,true,'E',duration,reason);
        }

        virtual void OnDelGLine(userrec* source, const std::string &hostmask)
        {
                OnLine(source,hostmask,false,'G',0,"");
        }

        virtual void OnDelZLine(userrec* source, const std::string &ipmask)
        {
                OnLine(source,ipmask,false,'Z',0,"");
        }

        virtual void OnDelQLine(userrec* source, const std::string &nickmask)
        {
                OnLine(source,nickmask,false,'Q',0,"");
        }

        virtual void OnDelELine(userrec* source, const std::string &hostmask)
        {
                OnLine(source,hostmask,false,'E',0,"");
        }

        virtual void OnMode(userrec* user, void* dest, int target_type, const std::string &text)
        {
                if ((IS_LOCAL(user)) && (user->registered == REG_ALL))
                {
                        if (target_type == TYPE_USER)
                        {
                                userrec* u = (userrec*)dest;
                                std::deque<std::string> params;
                                params.push_back(u->nick);
                                params.push_back(text);
                                Utils->DoOneToMany(user->nick,"MODE",params);
                        }
                        else
                        {
                                chanrec* c = (chanrec*)dest;
                                std::deque<std::string> params;
                                params.push_back(c->name);
                                params.push_back(text);
                                Utils->DoOneToMany(user->nick,"MODE",params);
                        }
                }
        }

        virtual void OnSetAway(userrec* user)
        {
                if (IS_LOCAL(user))
                {
                        std::deque<std::string> params;
                        params.push_back(":"+std::string(user->awaymsg));
                        Utils->DoOneToMany(user->nick,"AWAY",params);
                }
        }

        virtual void OnCancelAway(userrec* user)
        {
                if (IS_LOCAL(user))
                {
                        std::deque<std::string> params;
                        params.clear();
                        Utils->DoOneToMany(user->nick,"AWAY",params);
                }
        }

        virtual void ProtoSendMode(void* opaque, int target_type, void* target, const std::string &modeline)
        {
                TreeSocket* s = (TreeSocket*)opaque;
                if (target)
                {
                        if (target_type == TYPE_USER)
                        {
                                userrec* u = (userrec*)target;
                                s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" FMODE "+u->nick+" "+ConvToStr(u->age)+" "+modeline);
                        }
                        else
                        {
                                chanrec* c = (chanrec*)target;
                                s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" FMODE "+c->name+" "+ConvToStr(c->age)+" "+modeline);
                        }
                }
        }

        virtual void ProtoSendMetaData(void* opaque, int target_type, void* target, const std::string &extname, const std::string &extdata)
        {
                TreeSocket* s = (TreeSocket*)opaque;
                if (target)
                {
                        if (target_type == TYPE_USER)
                        {
                                userrec* u = (userrec*)target;
                                s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" METADATA "+u->nick+" "+extname+" :"+extdata);
                        }
                        else if (target_type == TYPE_CHANNEL)
                        {
                                chanrec* c = (chanrec*)target;
                                s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" METADATA "+c->name+" "+extname+" :"+extdata);
                        }
                }
                if (target_type == TYPE_OTHER)
                {
                        s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" METADATA * "+extname+" :"+extdata);
                }
        }

        virtual void OnEvent(Event* event)
        {
                std::deque<std::string>* params = (std::deque<std::string>*)event->GetData();

                if (event->GetEventID() == "send_metadata")
                {
                        if (params->size() < 3)
                                return;
                        (*params)[2] = ":" + (*params)[2];
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"METADATA",*params);
                }
                else if (event->GetEventID() == "send_topic")
                {
                        if (params->size() < 2)
                                return;
                        (*params)[1] = ":" + (*params)[1];
                        params->insert(params->begin() + 1,ServerInstance->Config->ServerName);
                        params->insert(params->begin() + 1,ConvToStr(ServerInstance->Time(true)));
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"FTOPIC",*params);
                }
                else if (event->GetEventID() == "send_mode")
                {
                        if (params->size() < 2)
                                return;
                        // Insert the TS value of the object, either userrec or chanrec
                        time_t ourTS = 0;
                        userrec* a = ServerInstance->FindNick((*params)[0]);
                        if (a)
                        {
                                ourTS = a->age;
                        }
                        else
                        {
                                chanrec* a = ServerInstance->FindChan((*params)[0]);
                                if (a)
                                {
                                        ourTS = a->age;
                                }
                        }
                        params->insert(params->begin() + 1,ConvToStr(ourTS));
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"FMODE",*params);
                }
                else if (event->GetEventID() == "send_mode_explicit")
                {
                        if (params->size() < 2)
                                return;
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"MODE",*params);
                }
                else if (event->GetEventID() == "send_opers")
                {
                        if (params->size() < 1)
                                return;
                        (*params)[0] = ":" + (*params)[0];
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"OPERNOTICE",*params);
                }
                else if (event->GetEventID() == "send_modeset")
                {
                        if (params->size() < 2)
                                return;
                        (*params)[1] = ":" + (*params)[1];
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"MODENOTICE",*params);
                }
                else if (event->GetEventID() == "send_snoset")
                {
                        if (params->size() < 2)
                                return;
                        (*params)[1] = ":" + (*params)[1];
                        Utils->DoOneToMany(ServerInstance->Config->ServerName,"SNONOTICE",*params);
                }
                else if (event->GetEventID() == "send_push")
                {
                        if (params->size() < 2)
                                return;
                        
                        userrec *a = ServerInstance->FindNick((*params)[0]);
                        
                        if (!a)
                                return;
                        
                        (*params)[1] = ":" + (*params)[1];
                        Utils->DoOneToOne(ServerInstance->Config->ServerName, "PUSH", *params, a->server);
                }
        }

        virtual ~ModuleSpanningTree()
        {
                ServerInstance->Log(DEBUG,"Performing unload of spanningtree!");
                /* This will also free the listeners */
                delete Utils;
                if (SyncTimer)
                        ServerInstance->Timers->DelTimer(SyncTimer);

                ServerInstance->DoneWithInterface("InspSocketHook");
        }

        virtual Version GetVersion()
        {
                return Version(1,1,0,2,VF_VENDOR,API_VERSION);
        }

        void Implements(char* List)
        {
                List[I_OnPreCommand] = List[I_OnGetServerDescription] = List[I_OnUserInvite] = List[I_OnPostLocalTopicChange] = 1;
                List[I_OnWallops] = List[I_OnUserNotice] = List[I_OnUserMessage] = List[I_OnBackgroundTimer] = 1;
                List[I_OnUserJoin] = List[I_OnChangeHost] = List[I_OnChangeName] = List[I_OnUserPart] = List[I_OnUserConnect] = 1;
                List[I_OnUserQuit] = List[I_OnUserPostNick] = List[I_OnUserKick] = List[I_OnRemoteKill] = List[I_OnRehash] = 1;
                List[I_OnOper] = List[I_OnAddGLine] = List[I_OnAddZLine] = List[I_OnAddQLine] = List[I_OnAddELine] = 1;
                List[I_OnDelGLine] = List[I_OnDelZLine] = List[I_OnDelQLine] = List[I_OnDelELine] = List[I_ProtoSendMode] = List[I_OnMode] = 1;
                List[I_OnStats] = List[I_ProtoSendMetaData] = List[I_OnEvent] = List[I_OnSetAway] = List[I_OnCancelAway] = List[I_OnPostCommand] = 1;
        }

        /* It is IMPORTANT that m_spanningtree is the last module in the chain
         * so that any activity it sees is FINAL, e.g. we arent going to send out
         * a NICK message before m_cloaking has finished putting the +x on the user,
         * etc etc.
         * Therefore, we return PRIORITY_LAST to make sure we end up at the END of
         * the module call queue.
         */
        Priority Prioritize()
        {
                return PRIORITY_LAST;
        }
};

TimeSyncTimer::TimeSyncTimer(InspIRCd *Inst, ModuleSpanningTree *Mod) : InspTimer(43200, Inst->Time()), Instance(Inst), Module(Mod)
{
}

void TimeSyncTimer::Tick(time_t TIME)
{
        Module->BroadcastTimeSync();
        Module->SyncTimer = new TimeSyncTimer(Instance, Module);
        Instance->Timers->AddTimer(Module->SyncTimer);
}

void SpanningTreeUtilities::DoFailOver(Link* x)
{
        if (x->FailOver.length())
        {
                if (x->FailOver == x->Name)
                {
                        ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Some muppet configured the failover for server \002%s\002 to point at itself. Not following it!", x->Name.c_str());
                        return;
                }
                Link* TryThisOne = this->FindLink(x->FailOver.c_str());
                if (TryThisOne)
                {
                        ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
                        Creator->ConnectServer(TryThisOne);
                }
                else
                {
                        ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
                }
        }
}

Link* SpanningTreeUtilities::FindLink(const std::string& name)
{
        for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
        {
                if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
                {
                        return &(*x);
                }
        }
        return NULL;
}

class ModuleSpanningTreeFactory : public ModuleFactory
{
 public:
        ModuleSpanningTreeFactory()
        {
        }
        
        ~ModuleSpanningTreeFactory()
        {
        }
        
        virtual Module * CreateModule(InspIRCd* Me)
        {
                return new ModuleSpanningTree(Me);
        }
        
};


extern "C" void * init_module( void )
{
        return new ModuleSpanningTreeFactory;
}