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 "../transport.h"
  18 #include "../m_hash.h"
  19 #include "socketengine.h"
  20
  21 #include "main.h"
  22 #include "utils.h"
  23 #include "treeserver.h"
  24 #include "link.h"
  25 #include "treesocket.h"
  26 #include "resolvers.h"
  27 #include "handshaketimer.h"
  28
  29 /* $ModDep: m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_hash.h m_spanningtree/handshaketimer.h */
  30
  31
  32 /** Because most of the I/O gubbins are encapsulated within
  33  * BufferedSocket, we just call the superclass constructor for
  34  * most of the action, and append a few of our own values
  35  * to it.
  36  */
  37 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, std::string shost, int iport, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Autoconnect* myac, Module* HookMod)
  38         : Utils(Util), IP(shost), myautoconnect(myac)
  39 {
  40         age = ServerInstance->Time();
  41         myhost = ServerName;
  42         capab_phase = 0;
  43         proto_version = 0;
  44         LinkState = CONNECTING;
  45         DoConnect(shost, iport, maxtime, bindto);
  46         Utils->timeoutlist[this] = std::pair<std::string, int>(ServerName, maxtime);
  47         if (HookMod)
  48                 BufferedSocketHookRequest(this, Utils->Creator, HookMod).Send();
  49         hstimer = NULL;
  50 }
  51
  52 /** When a listening socket gives us a new file descriptor,
  53  * we must associate it with a socket without creating a new
  54  * connection. This constructor is used for this purpose.
  55  */
  56 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, int newfd, char* ip, Autoconnect* myac, Module* HookMod)
  57         : BufferedSocket(newfd), Utils(Util), IP(ip), myautoconnect(myac)
  58 {
  59         age = ServerInstance->Time();
  60         LinkState = WAIT_AUTH_1;
  61         capab_phase = 0;
  62         proto_version = 0;
  63         /* If we have a transport module hooked to the parent, hook the same module to this
  64          * socket, and set a timer waiting for handshake before we send CAPAB etc.
  65          */
  66         if (HookMod)
  67                 BufferedSocketHookRequest(this, Utils->Creator, HookMod).Send();
  68
  69         hstimer = new HandshakeTimer(this, Utils->LinkBlocks[0], this->Utils, 1);
  70         ServerInstance->Timers->AddTimer(hstimer);
  71
  72         /* Fix by Brain - inbound sockets need a timeout, too. 30 secs should be pleanty */
  73         Utils->timeoutlist[this] = std::pair<std::string, int>("<unknown>", 30);
  74 }
  75
  76 ServerState TreeSocket::GetLinkState()
  77 {
  78         return this->LinkState;
  79 }
  80
  81 void TreeSocket::CleanNegotiationInfo()
  82 {
  83         ModuleList.clear();
  84         OptModuleList.clear();
  85         CapKeys.clear();
  86         ourchallenge.clear();
  87         theirchallenge.clear();
  88         OutboundPass.clear();
  89 }
  90
  91 TreeSocket::~TreeSocket()
  92 {
  93         if (GetIOHook())
  94                 BufferedSocketUnhookRequest(this, Utils->Creator, GetIOHook()).Send();
  95         if (hstimer)
  96                 ServerInstance->Timers->DelTimer(hstimer);
  97         Utils->timeoutlist.erase(this);
  98 }
  99
 100 /** When an outbound connection finishes connecting, we receive
 101  * this event, and must send our SERVER string to the other
 102  * side. If the other side is happy, as outlined in the server
 103  * to server docs on the inspircd.org site, the other side
 104  * will then send back its own server string.
 105  */
 106 void TreeSocket::OnConnected()
 107 {
 108         if (this->LinkState == CONNECTING)
 109         {
 110                 /* we do not need to change state here. */
 111                 for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i < Utils->LinkBlocks.end(); ++i)
 112                 {
 113                         Link* x = *i;
 114                         if (x->Name == this->myhost)
 115                         {
 116                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] started.", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->IP.c_str()));
 117                                 this->OutboundPass = x->SendPass;
 118                                 if (GetIOHook())
 119                                 {
 120                                         ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] using transport \2%s\2", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->IP.c_str()), x->Hook.c_str());
 121                                         hstimer = new HandshakeTimer(this, &(*x), this->Utils, 1);
 122                                         ServerInstance->Timers->AddTimer(hstimer);
 123                                 }
 124                                 else
 125                                         this->SendCapabilities(1);
 126                                 return;
 127                         }
 128                 }
 129         }
 130         /* There is a (remote) chance that between the /CONNECT and the connection
 131          * being accepted, some muppet has removed the <link> block and rehashed.
 132          * If that happens the connection hangs here until it's closed. Unlikely
 133          * and rather harmless.
 134          */
 135         ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2 lost link tag(!)", myhost.c_str());
 136 }
 137
 138 void TreeSocket::OnError(BufferedSocketError e)
 139 {
 140         switch (e)
 141         {
 142                 case I_ERR_CONNECT:
 143                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Connection to \002%s\002 refused", myhost.c_str());
 144                         Utils->Creator->ConnectServer(myautoconnect);
 145                 break;
 146                 case I_ERR_SOCKET:
 147                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Could not create socket (%s)", strerror(errno));
 148                 break;
 149                 case I_ERR_BIND:
 150                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Error binding socket to address or port (%s)", strerror(errno));
 151                 break;
 152                 case I_ERR_WRITE:
 153                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: I/O error on connection (%s)", errno ? strerror(errno) : "Connection closed unexpectedly");
 154                 break;
 155                 case I_ERR_NOMOREFDS:
 156                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Operating system is out of file descriptors!");
 157                 break;
 158                 default:
 159                         if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
 160                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \002%s\002 failed with OS error: %s", myhost.c_str(), strerror(errno));
 161                 break;
 162         }
 163 }
 164
 165 void TreeSocket::SendError(const std::string &errormessage)
 166 {
 167         /* Display the error locally as well as sending it remotely */
 168         ServerInstance->SNO->WriteToSnoMask('l', "Sent \2ERROR\2 to %s: %s", (this->InboundServerName.empty() ? this->IP.c_str() : this->InboundServerName.c_str()), errormessage.c_str());
 169         WriteLine("ERROR :"+errormessage);
 170 }
 171
 172 /** This function forces this server to quit, removing this server
 173  * and any users on it (and servers and users below that, etc etc).
 174  * It's very slow and pretty clunky, but luckily unless your network
 175  * is having a REAL bad hair day, this function shouldnt be called
 176  * too many times a month ;-)
 177  */
 178 void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
 179 {
 180         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"SquitServer for %s from %s",
 181                 Current->GetName().c_str(), from.c_str());
 182         /* recursively squit the servers attached to 'Current'.
 183          * We're going backwards so we don't remove users
 184          * while we still need them ;)
 185          */
 186         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 187         {
 188                 TreeServer* recursive_server = Current->GetChild(q);
 189                 this->SquitServer(from,recursive_server);
 190         }
 191         /* Now we've whacked the kids, whack self */
 192         num_lost_servers++;
 193         num_lost_users += Current->QuitUsers(from);
 194 }
 195
 196 /** This is a wrapper function for SquitServer above, which
 197  * does some validation first and passes on the SQUIT to all
 198  * other remaining servers.
 199  */
 200 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 201 {
 202         bool LocalSquit = false;
 203
 204         if ((Current) && (Current != Utils->TreeRoot))
 205         {
 206                 Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server");
 207                 rmode.Send();
 208
 209                 parameterlist params;
 210                 params.push_back(Current->GetName());
 211                 params.push_back(":"+reason);
 212                 Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
 213                 if (Current->GetParent() == Utils->TreeRoot)
 214                 {
 215                         ServerInstance->SNO->WriteToSnoMask('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 216                         LocalSquit = true;
 217                 }
 218                 else
 219                 {
 220                         ServerInstance->SNO->WriteToSnoMask('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 221                 }
 222                 num_lost_servers = 0;
 223                 num_lost_users = 0;
 224                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
 225                 SquitServer(from, Current);
 226                 Current->Tidy();
 227                 Current->GetParent()->DelChild(Current);
 228                 delete Current;
 229                 if (LocalSquit)
 230                         ServerInstance->SNO->WriteToSnoMask('l', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 231                 else
 232                         ServerInstance->SNO->WriteToSnoMask('L', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 233         }
 234         else
 235                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
 236 }
 237
 238 /** This function is called when we receive data from a remote
 239  * server.
 240  */
 241 void TreeSocket::OnDataReady()
 242 {
 243         Utils->Creator->loopCall = true;
 244         /* While there is at least one new line in the buffer,
 245          * do something useful (we hope!) with it.
 246          */
 247         while (recvq.find("\n") != std::string::npos)
 248         {
 249                 std::string ret = recvq.substr(0,recvq.find("\n")-1);
 250                 recvq = recvq.substr(recvq.find("\n")+1,recvq.length()-recvq.find("\n"));
 251                 /* Use rfind here not find, as theres more
 252                  * chance of the \r being near the end of the
 253                  * string, not the start.
 254                  */
 255                 if (ret.find("\r") != std::string::npos)
 256                         ret = recvq.substr(0,recvq.find("\r")-1);
 257                 /* Process this one, abort if it
 258                  * didnt return true.
 259                  */
 260                 if (!this->ProcessLine(ret))
 261                 {
 262                         SetError("ProcessLine returned false");
 263                         break;
 264                 }
 265         }
 266         Utils->Creator->loopCall = false;
 267 }