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(Link* link, Autoconnect* myac, const std::string& ipaddr)
  39         : linkID(assign(link->Name)), LinkState(CONNECTING), MyRoot(NULL), proto_version(0), ConnectionFailureShown(false)
  40         , age(ServerInstance->Time())
  41 {
  42         capab = new CapabData;
  43         capab->link = link;
  44         capab->ac = myac;
  45         capab->capab_phase = 0;
  46         if (!link->Hook.empty())
  47         {
  48                 ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, link->Hook);
  49                 if (!prov)
  50                 {
  51                         SetError("Could not find hook '" + link->Hook + "' for connection to " + linkID);
  52                         return;
  53                 }
  54                 AddIOHook(static_cast<IOHook*>(prov));
  55         }
  56         DoConnect(ipaddr, link->Port, link->Timeout, link->Bind);
  57         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, link->Timeout);
  58         SendCapabilities(1);
  59 }
  60
  61 /** When a listening socket gives us a new file descriptor,
  62  * we must associate it with a socket without creating a new
  63  * connection. This constructor is used for this purpose.
  64  */
  65 TreeSocket::TreeSocket(int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  66         : BufferedSocket(newfd)
  67         , linkID("inbound from " + client->addr()), LinkState(WAIT_AUTH_1), MyRoot(NULL), proto_version(0)
  68         , ConnectionFailureShown(false), age(ServerInstance->Time())
  69 {
  70         capab = new CapabData;
  71         capab->capab_phase = 0;
  72
  73         FOREACH_MOD(OnHookIO, (this, via));
  74         if (GetIOHook())
  75                 GetIOHook()->OnStreamSocketAccept(this, client, server);
  76         SendCapabilities(1);
  77
  78         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
  79 }
  80
  81 ServerState TreeSocket::GetLinkState()
  82 {
  83         return this->LinkState;
  84 }
  85
  86 void TreeSocket::CleanNegotiationInfo()
  87 {
  88         // connect is good, reset the autoconnect block (if used)
  89         if (capab->ac)
  90                 capab->ac->position = -1;
  91         delete capab;
  92         capab = NULL;
  93 }
  94
  95 CullResult TreeSocket::cull()
  96 {
  97         Utils->timeoutlist.erase(this);
  98         if (capab && capab->ac)
  99                 Utils->Creator->ConnectServer(capab->ac, false);
 100         return this->BufferedSocket::cull();
 101 }
 102
 103 TreeSocket::~TreeSocket()
 104 {
 105         delete capab;
 106 }
 107
 108 /** When an outbound connection finishes connecting, we receive
 109  * this event, and must send our SERVER string to the other
 110  * side. If the other side is happy, as outlined in the server
 111  * to server docs on the inspircd.org site, the other side
 112  * will then send back its own server string.
 113  */
 114 void TreeSocket::OnConnected()
 115 {
 116         if (this->LinkState == CONNECTING)
 117         {
 118                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", linkID.c_str(),
 119                         (capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
 120                 this->SendCapabilities(1);
 121         }
 122 }
 123
 124 void TreeSocket::OnError(BufferedSocketError e)
 125 {
 126         ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\002%s\002' failed with error: %s",
 127                 linkID.c_str(), getError().c_str());
 128         LinkState = DYING;
 129 }
 130
 131 void TreeSocket::SendError(const std::string &errormessage)
 132 {
 133         WriteLine("ERROR :"+errormessage);
 134         DoWrite();
 135         LinkState = DYING;
 136         SetError(errormessage);
 137 }
 138
 139 /** This function forces this server to quit, removing this server
 140  * and any users on it (and servers and users below that, etc etc).
 141  * It's very slow and pretty clunky, but luckily unless your network
 142  * is having a REAL bad hair day, this function shouldnt be called
 143  * too many times a month ;-)
 144  */
 145 void TreeSocket::SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users)
 146 {
 147         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "SquitServer for %s from %s", Current->GetName().c_str(), from.c_str());
 148         /* recursively squit the servers attached to 'Current'.
 149          * We're going backwards so we don't remove users
 150          * while we still need them ;)
 151          */
 152         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 153         {
 154                 TreeServer* recursive_server = Current->GetChild(q);
 155                 this->SquitServer(from,recursive_server, num_lost_servers, num_lost_users);
 156         }
 157         /* Now we've whacked the kids, whack self */
 158         num_lost_servers++;
 159         num_lost_users += Current->QuitUsers(from);
 160 }
 161
 162 /** This is a wrapper function for SquitServer above, which
 163  * does some validation first and passes on the SQUIT to all
 164  * other remaining servers.
 165  */
 166 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 167 {
 168         bool LocalSquit = false;
 169
 170         if ((Current) && (Current != Utils->TreeRoot))
 171         {
 172                 DelServerEvent(Utils->Creator, Current->GetName());
 173
 174                 if (!Current->GetSocket() || Current->GetSocket()->Introduced())
 175                 {
 176                         parameterlist params;
 177                         params.push_back(Current->GetID());
 178                         params.push_back(":"+reason);
 179                         Utils->DoOneToAllButSender(Current->GetParent()->GetID(),"SQUIT",params,Current->GetName());
 180                 }
 181
 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(MODNAME, LOG_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 }
 236
 237 bool TreeSocket::Introduced()
 238 {
 239         return (capab == NULL);
 240 }