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