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 #include "commands.h"
  33
  34 /** Because most of the I/O gubbins are encapsulated within
  35  * BufferedSocket, we just call the superclass constructor for
  36  * most of the action, and append a few of our own values
  37  * to it.
  38  */
  39 TreeSocket::TreeSocket(Link* link, Autoconnect* myac, const std::string& ipaddr)
  40         : linkID(assign(link->Name)), LinkState(CONNECTING), MyRoot(NULL), proto_version(0), ConnectionFailureShown(false)
  41         , age(ServerInstance->Time())
  42 {
  43         capab = new CapabData;
  44         capab->link = link;
  45         capab->ac = myac;
  46         capab->capab_phase = 0;
  47         if (!link->Hook.empty())
  48         {
  49                 ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, link->Hook);
  50                 if (!prov)
  51                 {
  52                         SetError("Could not find hook '" + link->Hook + "' for connection to " + linkID);
  53                         return;
  54                 }
  55                 AddIOHook(static_cast<IOHook*>(prov));
  56         }
  57         DoConnect(ipaddr, link->Port, link->Timeout, link->Bind);
  58         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, link->Timeout);
  59         SendCapabilities(1);
  60 }
  61
  62 /** When a listening socket gives us a new file descriptor,
  63  * we must associate it with a socket without creating a new
  64  * connection. This constructor is used for this purpose.
  65  */
  66 TreeSocket::TreeSocket(int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  67         : BufferedSocket(newfd)
  68         , linkID("inbound from " + client->addr()), LinkState(WAIT_AUTH_1), MyRoot(NULL), proto_version(0)
  69         , ConnectionFailureShown(false), age(ServerInstance->Time())
  70 {
  71         capab = new CapabData;
  72         capab->capab_phase = 0;
  73
  74         FOREACH_MOD(OnHookIO, (this, via));
  75         if (GetIOHook())
  76                 GetIOHook()->OnStreamSocketAccept(this, client, server);
  77         SendCapabilities(1);
  78
  79         Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
  80 }
  81
  82 ServerState TreeSocket::GetLinkState()
  83 {
  84         return this->LinkState;
  85 }
  86
  87 void TreeSocket::CleanNegotiationInfo()
  88 {
  89         // connect is good, reset the autoconnect block (if used)
  90         if (capab->ac)
  91                 capab->ac->position = -1;
  92         delete capab;
  93         capab = NULL;
  94 }
  95
  96 CullResult TreeSocket::cull()
  97 {
  98         Utils->timeoutlist.erase(this);
  99         if (capab && capab->ac)
 100                 Utils->Creator->ConnectServer(capab->ac, false);
 101         return this->BufferedSocket::cull();
 102 }
 103
 104 TreeSocket::~TreeSocket()
 105 {
 106         delete capab;
 107 }
 108
 109 /** When an outbound connection finishes connecting, we receive
 110  * this event, and must send our SERVER string to the other
 111  * side. If the other side is happy, as outlined in the server
 112  * to server docs on the inspircd.org site, the other side
 113  * will then send back its own server string.
 114  */
 115 void TreeSocket::OnConnected()
 116 {
 117         if (this->LinkState == CONNECTING)
 118         {
 119                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", linkID.c_str(),
 120                         (capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
 121                 this->SendCapabilities(1);
 122         }
 123 }
 124
 125 void TreeSocket::OnError(BufferedSocketError e)
 126 {
 127         ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\002%s\002' failed with error: %s",
 128                 linkID.c_str(), getError().c_str());
 129         LinkState = DYING;
 130 }
 131
 132 void TreeSocket::SendError(const std::string &errormessage)
 133 {
 134         WriteLine("ERROR :"+errormessage);
 135         DoWrite();
 136         LinkState = DYING;
 137         SetError(errormessage);
 138 }
 139
 140 /** This function forces this server to quit, removing this server
 141  * and any users on it (and servers and users below that, etc etc).
 142  * It's very slow and pretty clunky, but luckily unless your network
 143  * is having a REAL bad hair day, this function shouldnt be called
 144  * too many times a month ;-)
 145  */
 146 void TreeSocket::SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users)
 147 {
 148         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "SquitServer for %s from %s", Current->GetName().c_str(), from.c_str());
 149         /* recursively squit the servers attached to 'Current'.
 150          * We're going backwards so we don't remove users
 151          * while we still need them ;)
 152          */
 153         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 154         {
 155                 TreeServer* recursive_server = Current->GetChild(q);
 156                 this->SquitServer(from,recursive_server, num_lost_servers, num_lost_users);
 157         }
 158         /* Now we've whacked the kids, whack self */
 159         num_lost_servers++;
 160         num_lost_users += Current->QuitUsers(from);
 161 }
 162
 163 /** This is a wrapper function for SquitServer above, which
 164  * does some validation first and passes on the SQUIT to all
 165  * other remaining servers.
 166  */
 167 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 168 {
 169         bool LocalSquit = false;
 170
 171         if (Current != Utils->TreeRoot)
 172         {
 173                 DelServerEvent(Utils->Creator, Current->GetName());
 174
 175                 if (Current->GetParent() == Utils->TreeRoot)
 176                 {
 177                         ServerInstance->SNO->WriteGlobalSno('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 178                         LocalSquit = true;
 179                         if (Current->GetSocket()->Introduced())
 180                         {
 181                                 parameterlist params;
 182                                 params.push_back(Current->GetID());
 183                                 params.push_back(":"+reason);
 184                                 Utils->DoOneToMany(Utils->TreeRoot->GetID(), "SQUIT", params);
 185                         }
 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 }
 208
 209 CmdResult CommandSQuit::Handle(User* user, std::vector<std::string>& params)
 210 {
 211         TreeServer* quitting = Utils->FindServer(params[0]);
 212         if (!quitting)
 213         {
 214                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Squit from unknown server");
 215                 return CMD_FAILURE;
 216         }
 217
 218         TreeSocket* sock = Utils->FindServer(user->server)->GetRoute()->GetSocket();
 219         sock->Squit(quitting, params[1]);
 220         return CMD_SUCCESS;
 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 }