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