src/modules/m_spanningtree/treesocket1.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "socket.h"
  16 #include "xline.h"
  17 #include "../m_hash.h"
  18 #include "socketengine.h"
  19
  20 #include "main.h"
  21 #include "../spanningtree.h"
  22 #include "utils.h"
  23 #include "treeserver.h"
  24 #include "link.h"
  25 #include "treesocket.h"
  26 #include "resolvers.h"
  27
  28 /** Because most of the I/O gubbins are encapsulated within
  29  * BufferedSocket, we just call the superclass constructor for
  30  * most of the action, and append a few of our own values
  31  * to it.
  32  */
  33 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, Link* link, Autoconnect* myac, const std::string& ipaddr)
  34         : Utils(Util)
  35 {
  36         age = ServerInstance->Time();
  37         linkID = assign(link->Name);
  38         capab = new CapabData;
  39         capab->link = link;
  40         capab->ac = myac;
  41         capab->capab_phase = 0;
  42         MyRoot = NULL;
  43         proto_version = 0;
  44         LinkState = CONNECTING;
  45         if (!link->Hook.empty())
  46         {
  47                 ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, link->Hook);
  48                 if (!prov)
  49                 {
  50                         SetError("Could not find hook '" + link->Hook + "' for connection to " + linkID);
  51                         return;
  52                 }
  53                 AddIOHook(prov->creator);
  54         }
  55         DoConnect(ipaddr, link->Port, link->Timeout, link->Bind);
  56         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, link->Timeout);
  57         SendCapabilities(1);
  58 }
  59
  60 /** When a listening socket gives us a new file descriptor,
  61  * we must associate it with a socket without creating a new
  62  * connection. This constructor is used for this purpose.
  63  */
  64 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  65         : BufferedSocket(newfd), Utils(Util)
  66 {
  67         capab = new CapabData;
  68         capab->capab_phase = 0;
  69         MyRoot = NULL;
  70         age = ServerInstance->Time();
  71         LinkState = WAIT_AUTH_1;
  72         proto_version = 0;
  73         linkID = "inbound from " + client->addr();
  74
  75         FOREACH_MOD(I_OnHookIO, OnHookIO(this, via));
  76         if (GetIOHook())
  77                 GetIOHook()->OnStreamSocketAccept(this, client, server);
  78         SendCapabilities(1);
  79
  80         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
  81 }
  82
  83 ServerState TreeSocket::GetLinkState()
  84 {
  85         return this->LinkState;
  86 }
  87
  88 void TreeSocket::CleanNegotiationInfo()
  89 {
  90         // connect is good, reset the autoconnect block (if used)
  91         if (capab->ac)
  92                 capab->ac->position = -1;
  93         delete capab;
  94         capab = NULL;
  95 }
  96
  97 CullResult TreeSocket::cull()
  98 {
  99         Utils->timeoutlist.erase(this);
 100         if (capab && capab->ac)
 101                 Utils->Creator->ConnectServer(capab->ac, false);
 102         return this->BufferedSocket::cull();
 103 }
 104
 105 TreeSocket::~TreeSocket()
 106 {
 107         if (capab)
 108                 delete capab;
 109 }
 110
 111 /** When an outbound connection finishes connecting, we receive
 112  * this event, and must send our SERVER string to the other
 113  * side. If the other side is happy, as outlined in the server
 114  * to server docs on the inspircd.org site, the other side
 115  * will then send back its own server string.
 116  */
 117 void TreeSocket::OnConnected()
 118 {
 119         if (this->LinkState == CONNECTING)
 120         {
 121                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", linkID.c_str(),
 122                         (capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
 123                 this->SendCapabilities(1);
 124         }
 125 }
 126
 127 void TreeSocket::OnError(BufferedSocketError e)
 128 {
 129         ServerInstance->SNO->WriteGlobalSno('l', "Connection to \002%s\002 failed with error: %s",
 130                 linkID.c_str(), getError().c_str());
 131         LinkState = DYING;
 132 }
 133
 134 void TreeSocket::SendError(const std::string &errormessage)
 135 {
 136         WriteLine("ERROR :"+errormessage);
 137         DoWrite();
 138         LinkState = DYING;
 139         SetError(errormessage);
 140 }
 141
 142 /** This function forces this server to quit, removing this server
 143  * and any users on it (and servers and users below that, etc etc).
 144  * It's very slow and pretty clunky, but luckily unless your network
 145  * is having a REAL bad hair day, this function shouldnt be called
 146  * too many times a month ;-)
 147  */
 148 void TreeSocket::SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users)
 149 {
 150         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"SquitServer for %s from %s",
 151                 Current->GetName().c_str(), from.c_str());
 152         /* recursively squit the servers attached to 'Current'.
 153          * We're going backwards so we don't remove users
 154          * while we still need them ;)
 155          */
 156         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 157         {
 158                 TreeServer* recursive_server = Current->GetChild(q);
 159                 this->SquitServer(from,recursive_server, num_lost_servers, num_lost_users);
 160         }
 161         /* Now we've whacked the kids, whack self */
 162         num_lost_servers++;
 163         num_lost_users += Current->QuitUsers(from);
 164 }
 165
 166 /** This is a wrapper function for SquitServer above, which
 167  * does some validation first and passes on the SQUIT to all
 168  * other remaining servers.
 169  */
 170 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 171 {
 172         bool LocalSquit = false;
 173
 174         if ((Current) && (Current != Utils->TreeRoot))
 175         {
 176                 DelServerEvent(Utils->Creator, Current->GetName());
 177
 178                 parameterlist params;
 179                 params.push_back(Current->GetName());
 180                 params.push_back(":"+reason);
 181                 Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
 182                 if (Current->GetParent() == Utils->TreeRoot)
 183                 {
 184                         ServerInstance->SNO->WriteGlobalSno('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 185                         LocalSquit = true;
 186                 }
 187                 else
 188                 {
 189                         ServerInstance->SNO->WriteGlobalSno('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 190                 }
 191                 int num_lost_servers = 0;
 192                 int num_lost_users = 0;
 193                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
 194                 SquitServer(from, Current, num_lost_servers, num_lost_users);
 195                 ServerInstance->SNO->WriteToSnoMask(LocalSquit ? 'l' : 'L', "Netsplit complete, lost \002%d\002 user%s on \002%d\002 server%s.",
 196                         num_lost_users, num_lost_users != 1 ? "s" : "", num_lost_servers, num_lost_servers != 1 ? "s" : "");
 197                 Current->Tidy();
 198                 Current->GetParent()->DelChild(Current);
 199                 Current->cull();
 200                 delete Current;
 201                 if (Current == MyRoot)
 202                 {
 203                         MyRoot = NULL;
 204                         Close();
 205                 }
 206         }
 207         else
 208                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
 209 }
 210
 211 /** This function is called when we receive data from a remote
 212  * server.
 213  */
 214 void TreeSocket::OnDataReady()
 215 {
 216         Utils->Creator->loopCall = true;
 217         std::string line;
 218         while (GetNextLine(line))
 219         {
 220                 std::string::size_type rline = line.find('\r');
 221                 if (rline != std::string::npos)
 222                         line = line.substr(0,rline);
 223                 if (line.find('\0') != std::string::npos)
 224                 {
 225                         SendError("Read null character from socket");
 226                         break;
 227                 }
 228                 ProcessLine(line);
 229                 if (!getError().empty())
 230                         break;
 231         }
 232         if (LinkState != CONNECTED && recvq.length() > 4096)
 233                 SendError("RecvQ overrun (line too long)");
 234         Utils->Creator->loopCall = false;
 235 }