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<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 112                 {
 113                         if (x->Name == this->myhost)
 114                         {
 115                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] started.", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->IP.c_str()));
 116                                 this->OutboundPass = x->SendPass;
 117                                 if (GetIOHook())
 118                                 {
 119                                         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());
 120                                         hstimer = new HandshakeTimer(this, &(*x), this->Utils, 1);
 121                                         ServerInstance->Timers->AddTimer(hstimer);
 122                                 }
 123                                 else
 124                                         this->SendCapabilities(1);
 125                                 return;
 126                         }
 127                 }
 128         }
 129         /* There is a (remote) chance that between the /CONNECT and the connection
 130          * being accepted, some muppet has removed the <link> block and rehashed.
 131          * If that happens the connection hangs here until it's closed. Unlikely
 132          * and rather harmless.
 133          */
 134         ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2 lost link tag(!)", myhost.c_str());
 135 }
 136
 137 void TreeSocket::OnError(BufferedSocketError e)
 138 {
 139         switch (e)
 140         {
 141                 case I_ERR_CONNECT:
 142                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Connection to \002%s\002 refused", myhost.c_str());
 143                         Utils->DoFailOver(myautoconnect);
 144                 break;
 145                 case I_ERR_SOCKET:
 146                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Could not create socket (%s)", strerror(errno));
 147                 break;
 148                 case I_ERR_BIND:
 149                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Error binding socket to address or port (%s)", strerror(errno));
 150                 break;
 151                 case I_ERR_WRITE:
 152                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: I/O error on connection (%s)", errno ? strerror(errno) : "Connection closed unexpectedly");
 153                 break;
 154                 case I_ERR_NOMOREFDS:
 155                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Operating system is out of file descriptors!");
 156                 break;
 157                 default:
 158                         if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
 159                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \002%s\002 failed with OS error: %s", myhost.c_str(), strerror(errno));
 160                 break;
 161         }
 162 }
 163
 164 void TreeSocket::SendError(const std::string &errormessage)
 165 {
 166         /* Display the error locally as well as sending it remotely */
 167         ServerInstance->SNO->WriteToSnoMask('l', "Sent \2ERROR\2 to %s: %s", (this->InboundServerName.empty() ? this->IP.c_str() : this->InboundServerName.c_str()), errormessage.c_str());
 168         WriteLine("ERROR :"+errormessage);
 169 }
 170
 171 /** This function forces this server to quit, removing this server
 172  * and any users on it (and servers and users below that, etc etc).
 173  * It's very slow and pretty clunky, but luckily unless your network
 174  * is having a REAL bad hair day, this function shouldnt be called
 175  * too many times a month ;-)
 176  */
 177 void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
 178 {
 179         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"SquitServer for %s from %s",
 180                 Current->GetName().c_str(), from.c_str());
 181         /* recursively squit the servers attached to 'Current'.
 182          * We're going backwards so we don't remove users
 183          * while we still need them ;)
 184          */
 185         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 186         {
 187                 TreeServer* recursive_server = Current->GetChild(q);
 188                 this->SquitServer(from,recursive_server);
 189         }
 190         /* Now we've whacked the kids, whack self */
 191         num_lost_servers++;
 192         num_lost_users += Current->QuitUsers(from);
 193 }
 194
 195 /** This is a wrapper function for SquitServer above, which
 196  * does some validation first and passes on the SQUIT to all
 197  * other remaining servers.
 198  */
 199 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 200 {
 201         bool LocalSquit = false;
 202
 203         if ((Current) && (Current != Utils->TreeRoot))
 204         {
 205                 Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server");
 206                 rmode.Send();
 207
 208                 parameterlist params;
 209                 params.push_back(Current->GetName());
 210                 params.push_back(":"+reason);
 211                 Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
 212                 if (Current->GetParent() == Utils->TreeRoot)
 213                 {
 214                         ServerInstance->SNO->WriteToSnoMask('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 215                         LocalSquit = true;
 216                 }
 217                 else
 218                 {
 219                         ServerInstance->SNO->WriteToSnoMask('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 220                 }
 221                 num_lost_servers = 0;
 222                 num_lost_users = 0;
 223                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
 224                 SquitServer(from, Current);
 225                 Current->Tidy();
 226                 Current->GetParent()->DelChild(Current);
 227                 delete Current;
 228                 if (LocalSquit)
 229                         ServerInstance->SNO->WriteToSnoMask('l', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 230                 else
 231                         ServerInstance->SNO->WriteToSnoMask('L', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 232         }
 233         else
 234                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
 235 }
 236
 237 /** This function is called when we receive data from a remote
 238  * server.
 239  */
 240 void TreeSocket::OnDataReady()
 241 {
 242         Utils->Creator->loopCall = true;
 243         /* While there is at least one new line in the buffer,
 244          * do something useful (we hope!) with it.
 245          */
 246         while (recvq.find("\n") != std::string::npos)
 247         {
 248                 std::string ret = recvq.substr(0,recvq.find("\n")-1);
 249                 recvq = recvq.substr(recvq.find("\n")+1,recvq.length()-recvq.find("\n"));
 250                 /* Use rfind here not find, as theres more
 251                  * chance of the \r being near the end of the
 252                  * string, not the start.
 253                  */
 254                 if (ret.find("\r") != std::string::npos)
 255                         ret = recvq.substr(0,recvq.find("\r")-1);
 256                 /* Process this one, abort if it
 257                  * didnt return true.
 258                  */
 259                 if (!this->ProcessLine(ret))
 260                 {
 261                         SetError("ProcessLine returned false");
 262                         break;
 263                 }
 264         }
 265         Utils->Creator->loopCall = false;
 266 }