src/modules/m_spanningtree/treesocket1.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 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_phase = 0;
  39         proto_version = 0;
  40         LinkState = CONNECTING;
  41         DoConnect(shost, iport, maxtime, bindto);
  42         Utils->timeoutlist[this] = std::pair<std::string, int>(ServerName, maxtime);
  43         // TODO AddIOHook using the given hook
  44         SendCapabilities(1);
  45 }
  46
  47 /** When a listening socket gives us a new file descriptor,
  48  * we must associate it with a socket without creating a new
  49  * connection. This constructor is used for this purpose.
  50  */
  51 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, int newfd, ListenSocketBase* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  52         : BufferedSocket(newfd), Utils(Util)
  53 {
  54         int dummy;
  55         irc::sockets::satoap(client, IP, dummy);
  56         age = ServerInstance->Time();
  57         LinkState = WAIT_AUTH_1;
  58         capab_phase = 0;
  59         proto_version = 0;
  60
  61         FOREACH_MOD(I_OnHookIO, OnHookIO(this, via));
  62         if (GetIOHook())
  63                 GetIOHook()->OnStreamSocketAccept(this, client, server);
  64         SendCapabilities(1);
  65
  66         /* Fix by Brain - inbound sockets need a timeout, too. 30 secs should be pleanty */
  67         Utils->timeoutlist[this] = std::pair<std::string, int>("<from " + IP + ">", 30);
  68 }
  69
  70 ServerState TreeSocket::GetLinkState()
  71 {
  72         return this->LinkState;
  73 }
  74
  75 void TreeSocket::CleanNegotiationInfo()
  76 {
  77         ModuleList.clear();
  78         OptModuleList.clear();
  79         CapKeys.clear();
  80         ourchallenge.clear();
  81         theirchallenge.clear();
  82         OutboundPass.clear();
  83 }
  84
  85 bool TreeSocket::cull()
  86 {
  87         Utils->timeoutlist.erase(this);
  88         return this->BufferedSocket::cull();
  89 }
  90
  91 TreeSocket::~TreeSocket()
  92 {
  93 }
  94
  95 /** When an outbound connection finishes connecting, we receive
  96  * this event, and must send our SERVER string to the other
  97  * side. If the other side is happy, as outlined in the server
  98  * to server docs on the inspircd.org site, the other side
  99  * will then send back its own server string.
 100  */
 101 void TreeSocket::OnConnected()
 102 {
 103         if (this->LinkState == CONNECTING)
 104         {
 105                 /* we do not need to change state here. */
 106                 for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i < Utils->LinkBlocks.end(); ++i)
 107                 {
 108                         Link* x = *i;
 109                         if (x->Name == this->myhost)
 110                         {
 111                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] started.", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->IP.c_str()));
 112                                 this->OutboundPass = x->SendPass;
 113                                 this->SendCapabilities(1);
 114                                 return;
 115                         }
 116                 }
 117         }
 118         /* There is a (remote) chance that between the /CONNECT and the connection
 119          * being accepted, some muppet has removed the <link> block and rehashed.
 120          * If that happens the connection hangs here until it's closed. Unlikely
 121          * and rather harmless.
 122          */
 123         ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2 lost link tag(!)", myhost.c_str());
 124 }
 125
 126 void TreeSocket::OnError(BufferedSocketError e)
 127 {
 128         switch (e)
 129         {
 130                 case I_ERR_CONNECT:
 131                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Connection to \002%s\002 refused", myhost.c_str());
 132                         Utils->Creator->ConnectServer(myautoconnect);
 133                 break;
 134                 case I_ERR_SOCKET:
 135                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Could not create socket (%s)", strerror(errno));
 136                 break;
 137                 case I_ERR_BIND:
 138                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Error binding socket to address or port (%s)", strerror(errno));
 139                 break;
 140                 case I_ERR_WRITE:
 141                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: I/O error on connection (%s)", errno ? strerror(errno) : "Connection closed unexpectedly");
 142                 break;
 143                 case I_ERR_NOMOREFDS:
 144                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Operating system is out of file descriptors!");
 145                 break;
 146                 default:
 147                         if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
 148                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \002%s\002 failed with OS error: %s", myhost.c_str(), strerror(errno));
 149                 break;
 150         }
 151 }
 152
 153 void TreeSocket::SendError(const std::string &errormessage)
 154 {
 155         /* Display the error locally as well as sending it remotely */
 156         ServerInstance->SNO->WriteToSnoMask('l', "Sent \2ERROR\2 to %s: %s", (this->InboundServerName.empty() ? this->IP.c_str() : this->InboundServerName.c_str()), errormessage.c_str());
 157         WriteLine("ERROR :"+errormessage);
 158         SetError(errormessage);
 159 }
 160
 161 /** This function forces this server to quit, removing this server
 162  * and any users on it (and servers and users below that, etc etc).
 163  * It's very slow and pretty clunky, but luckily unless your network
 164  * is having a REAL bad hair day, this function shouldnt be called
 165  * too many times a month ;-)
 166  */
 167 void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
 168 {
 169         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"SquitServer for %s from %s",
 170                 Current->GetName().c_str(), from.c_str());
 171         /* recursively squit the servers attached to 'Current'.
 172          * We're going backwards so we don't remove users
 173          * while we still need them ;)
 174          */
 175         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 176         {
 177                 TreeServer* recursive_server = Current->GetChild(q);
 178                 this->SquitServer(from,recursive_server);
 179         }
 180         /* Now we've whacked the kids, whack self */
 181         num_lost_servers++;
 182         num_lost_users += Current->QuitUsers(from);
 183 }
 184
 185 /** This is a wrapper function for SquitServer above, which
 186  * does some validation first and passes on the SQUIT to all
 187  * other remaining servers.
 188  */
 189 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 190 {
 191         bool LocalSquit = false;
 192
 193         if ((Current) && (Current != Utils->TreeRoot))
 194         {
 195                 DelServerEvent(Utils->Creator, Current->GetName());
 196
 197                 parameterlist params;
 198                 params.push_back(Current->GetName());
 199                 params.push_back(":"+reason);
 200                 Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
 201                 if (Current->GetParent() == Utils->TreeRoot)
 202                 {
 203                         ServerInstance->SNO->WriteToSnoMask('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 204                         LocalSquit = true;
 205                 }
 206                 else
 207                 {
 208                         ServerInstance->SNO->WriteToSnoMask('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 209                 }
 210                 num_lost_servers = 0;
 211                 num_lost_users = 0;
 212                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
 213                 SquitServer(from, Current);
 214                 Current->Tidy();
 215                 Current->GetParent()->DelChild(Current);
 216                 delete Current;
 217                 if (LocalSquit)
 218                         ServerInstance->SNO->WriteToSnoMask('l', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 219                 else
 220                         ServerInstance->SNO->WriteToSnoMask('L', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 221         }
 222         else
 223                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
 224 }
 225
 226 /** This function is called when we receive data from a remote
 227  * server.
 228  */
 229 void TreeSocket::OnDataReady()
 230 {
 231         Utils->Creator->loopCall = true;
 232         /* While there is at least one new line in the buffer,
 233          * do something useful (we hope!) with it.
 234          */
 235         while (recvq.find("\n") != std::string::npos)
 236         {
 237                 std::string ret = recvq.substr(0,recvq.find("\n")-1);
 238                 recvq = recvq.substr(recvq.find("\n")+1,recvq.length()-recvq.find("\n"));
 239                 /* Use rfind here not find, as theres more
 240                  * chance of the \r being near the end of the
 241                  * string, not the start.
 242                  */
 243                 if (ret.find("\r") != std::string::npos)
 244                         ret = recvq.substr(0,recvq.find("\r")-1);
 245                 ProcessLine(ret);
 246         }
 247         Utils->Creator->loopCall = false;
 248 }