src/modules/m_spanningtree/treesocket1.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2007 Craig Edwards <craigedwards@brainbox.cc>
   7  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   8  *
   9  * This file is part of InspIRCd.  InspIRCd is free software: you can
  10  * redistribute it and/or modify it under the terms of the GNU General Public
  11  * License as published by the Free Software Foundation, version 2.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22
  23 #include "inspircd.h"
  24
  25 #include "main.h"
  26 #include "modules/spanningtree.h"
  27 #include "utils.h"
  28 #include "treeserver.h"
  29 #include "link.h"
  30 #include "treesocket.h"
  31
  32 /** Because most of the I/O gubbins are encapsulated within
  33  * BufferedSocket, we just call the superclass constructor for
  34  * most of the action, and append a few of our own values
  35  * to it.
  36  */
  37 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, Link* link, Autoconnect* myac, const std::string& ipaddr)
  38         : Utils(Util)
  39 {
  40         age = ServerInstance->Time();
  41         linkID = assign(link->Name);
  42         capab = new CapabData;
  43         capab->link = link;
  44         capab->ac = myac;
  45         capab->capab_phase = 0;
  46         MyRoot = NULL;
  47         proto_version = 0;
  48         ConnectionFailureShown = false;
  49         LinkState = CONNECTING;
  50         if (!link->Hook.empty())
  51         {
  52                 ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, link->Hook);
  53                 if (!prov)
  54                 {
  55                         SetError("Could not find hook '" + link->Hook + "' for connection to " + linkID);
  56                         return;
  57                 }
  58                 AddIOHook(prov->creator);
  59         }
  60         DoConnect(ipaddr, link->Port, link->Timeout, link->Bind);
  61         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, link->Timeout);
  62         SendCapabilities(1);
  63 }
  64
  65 /** When a listening socket gives us a new file descriptor,
  66  * we must associate it with a socket without creating a new
  67  * connection. This constructor is used for this purpose.
  68  */
  69 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  70         : BufferedSocket(newfd), Utils(Util)
  71 {
  72         capab = new CapabData;
  73         capab->capab_phase = 0;
  74         MyRoot = NULL;
  75         age = ServerInstance->Time();
  76         LinkState = WAIT_AUTH_1;
  77         proto_version = 0;
  78         ConnectionFailureShown = false;
  79         linkID = "inbound from " + client->addr();
  80
  81         FOREACH_MOD(I_OnHookIO, OnHookIO(this, via));
  82         if (GetIOHook())
  83                 GetIOHook()->OnStreamSocketAccept(this, client, server);
  84         SendCapabilities(1);
  85
  86         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
  87 }
  88
  89 ServerState TreeSocket::GetLinkState()
  90 {
  91         return this->LinkState;
  92 }
  93
  94 void TreeSocket::CleanNegotiationInfo()
  95 {
  96         // connect is good, reset the autoconnect block (if used)
  97         if (capab->ac)
  98                 capab->ac->position = -1;
  99         delete capab;
 100         capab = NULL;
 101 }
 102
 103 CullResult TreeSocket::cull()
 104 {
 105         Utils->timeoutlist.erase(this);
 106         if (capab && capab->ac)
 107                 Utils->Creator->ConnectServer(capab->ac, false);
 108         return this->BufferedSocket::cull();
 109 }
 110
 111 TreeSocket::~TreeSocket()
 112 {
 113         if (capab)
 114                 delete capab;
 115 }
 116
 117 /** When an outbound connection finishes connecting, we receive
 118  * this event, and must send our SERVER string to the other
 119  * side. If the other side is happy, as outlined in the server
 120  * to server docs on the inspircd.org site, the other side
 121  * will then send back its own server string.
 122  */
 123 void TreeSocket::OnConnected()
 124 {
 125         if (this->LinkState == CONNECTING)
 126         {
 127                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", linkID.c_str(),
 128                         (capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
 129                 this->SendCapabilities(1);
 130         }
 131 }
 132
 133 void TreeSocket::OnError(BufferedSocketError e)
 134 {
 135         ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\002%s\002' failed with error: %s",
 136                 linkID.c_str(), getError().c_str());
 137         LinkState = DYING;
 138 }
 139
 140 void TreeSocket::SendError(const std::string &errormessage)
 141 {
 142         WriteLine("ERROR :"+errormessage);
 143         DoWrite();
 144         LinkState = DYING;
 145         SetError(errormessage);
 146 }
 147
 148 /** This function forces this server to quit, removing this server
 149  * and any users on it (and servers and users below that, etc etc).
 150  * It's very slow and pretty clunky, but luckily unless your network
 151  * is having a REAL bad hair day, this function shouldnt be called
 152  * too many times a month ;-)
 153  */
 154 void TreeSocket::SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users)
 155 {
 156         std::string servername = Current->GetName();
 157         ServerInstance->Logs->Log("m_spanningtree",LOG_DEBUG,"SquitServer for %s from %s",
 158                 servername.c_str(), from.c_str());
 159         /* recursively squit the servers attached to 'Current'.
 160          * We're going backwards so we don't remove users
 161          * while we still need them ;)
 162          */
 163         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 164         {
 165                 TreeServer* recursive_server = Current->GetChild(q);
 166                 this->SquitServer(from,recursive_server, num_lost_servers, num_lost_users);
 167         }
 168         /* Now we've whacked the kids, whack self */
 169         num_lost_servers++;
 170         num_lost_users += Current->QuitUsers(from);
 171 }
 172
 173 /** This is a wrapper function for SquitServer above, which
 174  * does some validation first and passes on the SQUIT to all
 175  * other remaining servers.
 176  */
 177 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 178 {
 179         bool LocalSquit = false;
 180
 181         if ((Current) && (Current != Utils->TreeRoot))
 182         {
 183                 DelServerEvent(Utils->Creator, Current->GetName());
 184
 185                 if (!Current->GetSocket() || Current->GetSocket()->Introduced())
 186                 {
 187                         parameterlist params;
 188                         params.push_back(Current->GetID());
 189                         params.push_back(":"+reason);
 190                         Utils->DoOneToAllButSender(Current->GetParent()->GetID(),"SQUIT",params,Current->GetName());
 191                 }
 192
 193                 if (Current->GetParent() == Utils->TreeRoot)
 194                 {
 195                         ServerInstance->SNO->WriteGlobalSno('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 196                         LocalSquit = true;
 197                 }
 198                 else
 199                 {
 200                         ServerInstance->SNO->WriteGlobalSno('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 201                 }
 202                 int num_lost_servers = 0;
 203                 int num_lost_users = 0;
 204                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
 205                 SquitServer(from, Current, num_lost_servers, num_lost_users);
 206                 ServerInstance->SNO->WriteToSnoMask(LocalSquit ? 'l' : 'L', "Netsplit complete, lost \002%d\002 user%s on \002%d\002 server%s.",
 207                         num_lost_users, num_lost_users != 1 ? "s" : "", num_lost_servers, num_lost_servers != 1 ? "s" : "");
 208                 Current->Tidy();
 209                 Current->GetParent()->DelChild(Current);
 210                 Current->cull();
 211                 delete Current;
 212                 if (Current == MyRoot)
 213                 {
 214                         MyRoot = NULL;
 215                         Close();
 216                 }
 217         }
 218         else
 219                 ServerInstance->Logs->Log("m_spanningtree",LOG_DEFAULT,"Squit from unknown server");
 220 }
 221
 222 /** This function is called when we receive data from a remote
 223  * server.
 224  */
 225 void TreeSocket::OnDataReady()
 226 {
 227         Utils->Creator->loopCall = true;
 228         std::string line;
 229         while (GetNextLine(line))
 230         {
 231                 std::string::size_type rline = line.find('\r');
 232                 if (rline != std::string::npos)
 233                         line = line.substr(0,rline);
 234                 if (line.find('\0') != std::string::npos)
 235                 {
 236                         SendError("Read null character from socket");
 237                         break;
 238                 }
 239                 ProcessLine(line);
 240                 if (!getError().empty())
 241                         break;
 242         }
 243         if (LinkState != CONNECTED && recvq.length() > 4096)
 244                 SendError("RecvQ overrun (line too long)");
 245         Utils->Creator->loopCall = false;
 246 }
 247
 248 bool TreeSocket::Introduced()
 249 {
 250         return (capab == NULL);
 251 }