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), 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(SpanningTreeUtilities* Util, int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  66         : BufferedSocket(newfd), Utils(Util), linkID("inbound from " + client->addr()), LinkState(WAIT_AUTH_1), MyRoot(NULL), proto_version(0)
  67         , ConnectionFailureShown(false), age(ServerInstance->Time())
  68 {
  69         capab = new CapabData;
  70         capab->capab_phase = 0;
  71
  72         FOREACH_MOD(OnHookIO, (this, via));
  73         if (GetIOHook())
  74                 GetIOHook()->OnStreamSocketAccept(this, client, server);
  75         SendCapabilities(1);
  76
  77         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
  78 }
  79
  80 ServerState TreeSocket::GetLinkState()
  81 {
  82         return this->LinkState;
  83 }
  84
  85 void TreeSocket::CleanNegotiationInfo()
  86 {
  87         // connect is good, reset the autoconnect block (if used)
  88         if (capab->ac)
  89                 capab->ac->position = -1;
  90         delete capab;
  91         capab = NULL;
  92 }
  93
  94 CullResult TreeSocket::cull()
  95 {
  96         Utils->timeoutlist.erase(this);
  97         if (capab && capab->ac)
  98                 Utils->Creator->ConnectServer(capab->ac, false);
  99         return this->BufferedSocket::cull();
 100 }
 101
 102 TreeSocket::~TreeSocket()
 103 {
 104         delete capab;
 105 }
 106
 107 /** When an outbound connection finishes connecting, we receive
 108  * this event, and must send our SERVER string to the other
 109  * side. If the other side is happy, as outlined in the server
 110  * to server docs on the inspircd.org site, the other side
 111  * will then send back its own server string.
 112  */
 113 void TreeSocket::OnConnected()
 114 {
 115         if (this->LinkState == CONNECTING)
 116         {
 117                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", linkID.c_str(),
 118                         (capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
 119                 this->SendCapabilities(1);
 120         }
 121 }
 122
 123 void TreeSocket::OnError(BufferedSocketError e)
 124 {
 125         ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\002%s\002' failed with error: %s",
 126                 linkID.c_str(), getError().c_str());
 127         LinkState = DYING;
 128 }
 129
 130 void TreeSocket::SendError(const std::string &errormessage)
 131 {
 132         WriteLine("ERROR :"+errormessage);
 133         DoWrite();
 134         LinkState = DYING;
 135         SetError(errormessage);
 136 }
 137
 138 /** This function forces this server to quit, removing this server
 139  * and any users on it (and servers and users below that, etc etc).
 140  * It's very slow and pretty clunky, but luckily unless your network
 141  * is having a REAL bad hair day, this function shouldnt be called
 142  * too many times a month ;-)
 143  */
 144 void TreeSocket::SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users)
 145 {
 146         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "SquitServer for %s from %s", Current->GetName().c_str(), from.c_str());
 147         /* recursively squit the servers attached to 'Current'.
 148          * We're going backwards so we don't remove users
 149          * while we still need them ;)
 150          */
 151         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 152         {
 153                 TreeServer* recursive_server = Current->GetChild(q);
 154                 this->SquitServer(from,recursive_server, num_lost_servers, num_lost_users);
 155         }
 156         /* Now we've whacked the kids, whack self */
 157         num_lost_servers++;
 158         num_lost_users += Current->QuitUsers(from);
 159 }
 160
 161 /** This is a wrapper function for SquitServer above, which
 162  * does some validation first and passes on the SQUIT to all
 163  * other remaining servers.
 164  */
 165 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 166 {
 167         bool LocalSquit = false;
 168
 169         if ((Current) && (Current != Utils->TreeRoot))
 170         {
 171                 DelServerEvent(Utils->Creator, Current->GetName());
 172
 173                 if (!Current->GetSocket() || Current->GetSocket()->Introduced())
 174                 {
 175                         parameterlist params;
 176                         params.push_back(Current->GetID());
 177                         params.push_back(":"+reason);
 178                         Utils->DoOneToAllButSender(Current->GetParent()->GetID(),"SQUIT",params,Current->GetName());
 179                 }
 180
 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(MODNAME, LOG_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 }
 235
 236 bool TreeSocket::Introduced()
 237 {
 238         return (capab == NULL);
 239 }