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 #include "socket.h"
  25 #include "xline.h"
  26 #include "socketengine.h"
  27
  28 #include "main.h"
  29 #include "../spanningtree.h"
  30 #include "utils.h"
  31 #include "treeserver.h"
  32 #include "link.h"
  33 #include "treesocket.h"
  34 #include "resolvers.h"
  35
  36 /** Because most of the I/O gubbins are encapsulated within
  37  * BufferedSocket, we just call the superclass constructor for
  38  * most of the action, and append a few of our own values
  39  * to it.
  40  */
  41 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, Link* link, Autoconnect* myac, const std::string& ipaddr)
  42         : Utils(Util)
  43 {
  44         age = ServerInstance->Time();
  45         linkID = assign(link->Name);
  46         capab = new CapabData;
  47         capab->link = link;
  48         capab->ac = myac;
  49         capab->capab_phase = 0;
  50         MyRoot = NULL;
  51         proto_version = 0;
  52         ConnectionFailureShown = false;
  53         LinkState = CONNECTING;
  54         if (!link->Hook.empty())
  55         {
  56                 ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, link->Hook);
  57                 if (!prov)
  58                 {
  59                         SetError("Could not find hook '" + link->Hook + "' for connection to " + linkID);
  60                         return;
  61                 }
  62                 AddIOHook(prov->creator);
  63         }
  64         DoConnect(ipaddr, link->Port, link->Timeout, link->Bind);
  65         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, link->Timeout);
  66         SendCapabilities(1);
  67 }
  68
  69 /** When a listening socket gives us a new file descriptor,
  70  * we must associate it with a socket without creating a new
  71  * connection. This constructor is used for this purpose.
  72  */
  73 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  74         : BufferedSocket(newfd), Utils(Util)
  75 {
  76         capab = new CapabData;
  77         capab->capab_phase = 0;
  78         MyRoot = NULL;
  79         age = ServerInstance->Time();
  80         LinkState = WAIT_AUTH_1;
  81         proto_version = 0;
  82         ConnectionFailureShown = false;
  83         linkID = "inbound from " + client->addr();
  84
  85         FOREACH_MOD(I_OnHookIO, OnHookIO(this, via));
  86         if (GetIOHook())
  87                 GetIOHook()->OnStreamSocketAccept(this, client, server);
  88         SendCapabilities(1);
  89
  90         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
  91 }
  92
  93 ServerState TreeSocket::GetLinkState()
  94 {
  95         return this->LinkState;
  96 }
  97
  98 void TreeSocket::CleanNegotiationInfo()
  99 {
 100         // connect is good, reset the autoconnect block (if used)
 101         if (capab->ac)
 102                 capab->ac->position = -1;
 103         delete capab;
 104         capab = NULL;
 105 }
 106
 107 CullResult TreeSocket::cull()
 108 {
 109         Utils->timeoutlist.erase(this);
 110         if (capab && capab->ac)
 111                 Utils->Creator->ConnectServer(capab->ac, false);
 112         return this->BufferedSocket::cull();
 113 }
 114
 115 TreeSocket::~TreeSocket()
 116 {
 117         if (capab)
 118                 delete capab;
 119 }
 120
 121 /** When an outbound connection finishes connecting, we receive
 122  * this event, and must send our SERVER string to the other
 123  * side. If the other side is happy, as outlined in the server
 124  * to server docs on the inspircd.org site, the other side
 125  * will then send back its own server string.
 126  */
 127 void TreeSocket::OnConnected()
 128 {
 129         if (this->LinkState == CONNECTING)
 130         {
 131                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", linkID.c_str(),
 132                         (capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
 133                 this->SendCapabilities(1);
 134         }
 135 }
 136
 137 void TreeSocket::OnError(BufferedSocketError e)
 138 {
 139         ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\002%s\002' failed with error: %s",
 140                 linkID.c_str(), getError().c_str());
 141         LinkState = DYING;
 142 }
 143
 144 void TreeSocket::SendError(const std::string &errormessage)
 145 {
 146         WriteLine("ERROR :"+errormessage);
 147         DoWrite();
 148         LinkState = DYING;
 149         SetError(errormessage);
 150 }
 151
 152 /** This function forces this server to quit, removing this server
 153  * and any users on it (and servers and users below that, etc etc).
 154  * It's very slow and pretty clunky, but luckily unless your network
 155  * is having a REAL bad hair day, this function shouldnt be called
 156  * too many times a month ;-)
 157  */
 158 void TreeSocket::SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users)
 159 {
 160         std::string servername = Current->GetName();
 161         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"SquitServer for %s from %s",
 162                 servername.c_str(), from.c_str());
 163         /* recursively squit the servers attached to 'Current'.
 164          * We're going backwards so we don't remove users
 165          * while we still need them ;)
 166          */
 167         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 168         {
 169                 TreeServer* recursive_server = Current->GetChild(q);
 170                 this->SquitServer(from,recursive_server, num_lost_servers, num_lost_users);
 171         }
 172         /* Now we've whacked the kids, whack self */
 173         num_lost_servers++;
 174         num_lost_users += Current->QuitUsers(from);
 175 }
 176
 177 /** This is a wrapper function for SquitServer above, which
 178  * does some validation first and passes on the SQUIT to all
 179  * other remaining servers.
 180  */
 181 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 182 {
 183         bool LocalSquit = false;
 184
 185         if ((Current) && (Current != Utils->TreeRoot))
 186         {
 187                 DelServerEvent(Utils->Creator, Current->GetName());
 188
 189                 if (!Current->GetSocket() || Current->GetSocket()->Introduced())
 190                 {
 191                         parameterlist params;
 192                         params.push_back(Current->GetName());
 193                         params.push_back(":"+reason);
 194                         Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
 195                 }
 196
 197                 if (Current->GetParent() == Utils->TreeRoot)
 198                 {
 199                         ServerInstance->SNO->WriteGlobalSno('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 200                         LocalSquit = true;
 201                 }
 202                 else
 203                 {
 204                         ServerInstance->SNO->WriteGlobalSno('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 205                 }
 206                 int num_lost_servers = 0;
 207                 int num_lost_users = 0;
 208                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
 209                 SquitServer(from, Current, num_lost_servers, num_lost_users);
 210                 ServerInstance->SNO->WriteToSnoMask(LocalSquit ? 'l' : 'L', "Netsplit complete, lost \002%d\002 user%s on \002%d\002 server%s.",
 211                         num_lost_users, num_lost_users != 1 ? "s" : "", num_lost_servers, num_lost_servers != 1 ? "s" : "");
 212                 Current->Tidy();
 213                 Current->GetParent()->DelChild(Current);
 214                 Current->cull();
 215                 delete Current;
 216                 if (Current == MyRoot)
 217                 {
 218                         MyRoot = NULL;
 219                         Close();
 220                 }
 221         }
 222         else
 223                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
 224 }
 225
 226 /** This function is called when we receive data from a remote
 227  * server.
 228  */
 229 void TreeSocket::OnDataReady()
 230 {
 231         Utils->Creator->loopCall = true;
 232         std::string line;
 233         while (GetNextLine(line))
 234         {
 235                 std::string::size_type rline = line.find('\r');
 236                 if (rline != std::string::npos)
 237                         line = line.substr(0,rline);
 238                 if (line.find('\0') != std::string::npos)
 239                 {
 240                         SendError("Read null character from socket");
 241                         break;
 242                 }
 243                 ProcessLine(line);
 244                 if (!getError().empty())
 245                         break;
 246         }
 247         if (LinkState != CONNECTED && recvq.length() > 4096)
 248                 SendError("RecvQ overrun (line too long)");
 249         Utils->Creator->loopCall = false;
 250 }
 251
 252 bool TreeSocket::Introduced()
 253 {
 254         return (capab == NULL);
 255 }