src/modules/m_spanningtree/treesocket1.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "socket.h"
  16 #include "xline.h"
  17 #include "../m_hash.h"
  18 #include "socketengine.h"
  19
  20 #include "main.h"
  21 #include "../spanningtree.h"
  22 #include "utils.h"
  23 #include "treeserver.h"
  24 #include "link.h"
  25 #include "treesocket.h"
  26 #include "resolvers.h"
  27
  28 /** Because most of the I/O gubbins are encapsulated within
  29  * BufferedSocket, we just call the superclass constructor for
  30  * most of the action, and append a few of our own values
  31  * to it.
  32  */
  33 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, const std::string& shost, int iport, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Autoconnect* myac, const std::string& hook)
  34         : Utils(Util), IP(shost), myautoconnect(myac)
  35 {
  36         age = ServerInstance->Time();
  37         myhost = ServerName;
  38         capab = new CapabData;
  39         capab->capab_phase = 0;
  40         proto_version = 0;
  41         LinkState = CONNECTING;
  42         if (!hook.empty())
  43         {
  44                 ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, hook);
  45                 if (!prov)
  46                 {
  47                         SetError("Could not find hook '" + hook + "' for connection to " + ServerName);
  48                         return;
  49                 }
  50                 AddIOHook(prov->creator);
  51         }
  52         DoConnect(shost, iport, maxtime, bindto);
  53         Utils->timeoutlist[this] = std::pair<std::string, int>(ServerName, maxtime);
  54         SendCapabilities(1);
  55 }
  56
  57 /** When a listening socket gives us a new file descriptor,
  58  * we must associate it with a socket without creating a new
  59  * connection. This constructor is used for this purpose.
  60  */
  61 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  62         : BufferedSocket(newfd), Utils(Util)
  63 {
  64         capab = new CapabData;
  65         IP = client->addr();
  66         age = ServerInstance->Time();
  67         LinkState = WAIT_AUTH_1;
  68         capab->capab_phase = 0;
  69         proto_version = 0;
  70         myhost = "inbound from " + IP;
  71
  72         FOREACH_MOD(I_OnHookIO, 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>(myhost, 30);
  78 }
  79
  80 ServerState TreeSocket::GetLinkState()
  81 {
  82         return this->LinkState;
  83 }
  84
  85 void TreeSocket::CleanNegotiationInfo()
  86 {
  87         delete capab;
  88         capab = NULL;
  89 }
  90
  91 CullResult TreeSocket::cull()
  92 {
  93         Utils->timeoutlist.erase(this);
  94         if (myautoconnect)
  95                 Utils->Creator->ConnectServer(myautoconnect, false);
  96         return this->BufferedSocket::cull();
  97 }
  98
  99 TreeSocket::~TreeSocket()
 100 {
 101         if (capab)
 102                 delete capab;
 103 }
 104
 105 /** When an outbound connection finishes connecting, we receive
 106  * this event, and must send our SERVER string to the other
 107  * side. If the other side is happy, as outlined in the server
 108  * to server docs on the inspircd.org site, the other side
 109  * will then send back its own server string.
 110  */
 111 void TreeSocket::OnConnected()
 112 {
 113         if (this->LinkState == CONNECTING)
 114         {
 115                 /* we do not need to change state here. */
 116                 for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i < Utils->LinkBlocks.end(); ++i)
 117                 {
 118                         Link* x = *i;
 119                         if (x->Name == this->myhost)
 120                         {
 121                                 ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%s] started.", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->IP.c_str()));
 122                                 capab->OutboundPass = x->SendPass;
 123                                 this->SendCapabilities(1);
 124                                 return;
 125                         }
 126                 }
 127         }
 128         /* There is a (remote) chance that between the /CONNECT and the connection
 129          * being accepted, some muppet has removed the <link> block and rehashed.
 130          * If that happens the connection hangs here until it's closed. Unlikely
 131          * and rather harmless.
 132          */
 133         ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2 lost link tag(!)", myhost.c_str());
 134 }
 135
 136 void TreeSocket::OnError(BufferedSocketError e)
 137 {
 138         ServerInstance->SNO->WriteGlobalSno('l', "Connection to \002%s\002 failed with error: %s",
 139                 myhost.c_str(), getError().c_str());
 140         ServerInstance->GlobalCulls.AddItem(this);
 141 }
 142
 143 void TreeSocket::SendError(const std::string &errormessage)
 144 {
 145         WriteLine("ERROR :"+errormessage);
 146         DoWrite();
 147         LinkState = DYING;
 148         SetError(errormessage);
 149 }
 150
 151 /** This function forces this server to quit, removing this server
 152  * and any users on it (and servers and users below that, etc etc).
 153  * It's very slow and pretty clunky, but luckily unless your network
 154  * is having a REAL bad hair day, this function shouldnt be called
 155  * too many times a month ;-)
 156  */
 157 void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
 158 {
 159         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"SquitServer for %s from %s",
 160                 Current->GetName().c_str(), from.c_str());
 161         /* recursively squit the servers attached to 'Current'.
 162          * We're going backwards so we don't remove users
 163          * while we still need them ;)
 164          */
 165         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 166         {
 167                 TreeServer* recursive_server = Current->GetChild(q);
 168                 this->SquitServer(from,recursive_server);
 169         }
 170         /* Now we've whacked the kids, whack self */
 171         num_lost_servers++;
 172         num_lost_users += Current->QuitUsers(from);
 173 }
 174
 175 /** This is a wrapper function for SquitServer above, which
 176  * does some validation first and passes on the SQUIT to all
 177  * other remaining servers.
 178  */
 179 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 180 {
 181         bool LocalSquit = false;
 182
 183         if ((Current) && (Current != Utils->TreeRoot))
 184         {
 185                 DelServerEvent(Utils->Creator, Current->GetName());
 186
 187                 parameterlist params;
 188                 params.push_back(Current->GetName());
 189                 params.push_back(":"+reason);
 190                 Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
 191                 if (Current->GetParent() == Utils->TreeRoot)
 192                 {
 193                         ServerInstance->SNO->WriteGlobalSno('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 194                         LocalSquit = true;
 195                 }
 196                 else
 197                 {
 198                         ServerInstance->SNO->WriteGlobalSno('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 199                 }
 200                 num_lost_servers = 0;
 201                 num_lost_users = 0;
 202                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
 203                 SquitServer(from, Current);
 204                 Current->Tidy();
 205                 Current->GetParent()->DelChild(Current);
 206                 Current->cull();
 207                 delete Current;
 208                 if (LocalSquit)
 209                         ServerInstance->SNO->WriteToSnoMask('l', "Netsplit complete, lost \002%d\002 user%s on \002%d\002 server%s.", num_lost_users, num_lost_users != 1 ? "s" : "", num_lost_servers, num_lost_servers != 1 ? "s" : "");
 210                 else
 211                         ServerInstance->SNO->WriteToSnoMask('L', "Netsplit complete, lost \002%d\002 user%s on \002%d\002 server%s.", num_lost_users, num_lost_users != 1 ? "s" : "", num_lost_servers, num_lost_servers != 1 ? "s" : "");
 212         }
 213         else
 214                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
 215 }
 216
 217 /** This function is called when we receive data from a remote
 218  * server.
 219  */
 220 void TreeSocket::OnDataReady()
 221 {
 222         Utils->Creator->loopCall = true;
 223         std::string line;
 224         while (GetNextLine(line))
 225         {
 226                 std::string::size_type rline = line.find('\r');
 227                 if (rline != std::string::npos)
 228                         line = line.substr(0,rline);
 229                 if (line.find('\0') != std::string::npos)
 230                 {
 231                         SendError("Read null character from socket");
 232                         break;
 233                 }
 234                 ProcessLine(line);
 235                 if (!getError().empty())
 236                         break;
 237         }
 238         if (LinkState != CONNECTED && recvq.length() > 4096)
 239                 SendError("RecvQ overrun (line too long)");
 240         Utils->Creator->loopCall = false;
 241 }