src/modules/m_spanningtree/server.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/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 "commands/cmd_whois.h"
  16 #include "commands/cmd_stats.h"
  17 #include "socket.h"
  18 #include "wildcard.h"
  19 #include "xline.h"
  20 #include "transport.h"
  21 #include "socketengine.h"
  22
  23 #include "m_spanningtree/main.h"
  24 #include "m_spanningtree/utils.h"
  25 #include "m_spanningtree/treeserver.h"
  26 #include "m_spanningtree/link.h"
  27 #include "m_spanningtree/treesocket.h"
  28 #include "m_spanningtree/resolvers.h"
  29 #include "m_spanningtree/handshaketimer.h"
  30
  31 /* $ModDep: m_spanningtree/timesynctimer.h m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h */
  32
  33 /*
  34  * Some server somewhere in the network introducing another server.
  35  *      -- w
  36  */
  37 bool TreeSocket::RemoteServer(const std::string &prefix, std::deque<std::string> &params)
  38 {
  39         if (params.size() < 5)
  40         {
  41                 SendError("Protocol error - Missing SID");
  42                 return false;
  43         }
  44
  45         std::string servername = params[0];
  46         std::string password = params[1];
  47         // hopcount is not used for a remote server, we calculate this ourselves
  48         std::string sid = params[3];
  49         std::string description = params[4];
  50         TreeServer* ParentOfThis = Utils->FindServer(prefix);
  51         if (!ParentOfThis)
  52         {
  53                 this->SendError("Protocol error - Introduced remote server from unknown server "+prefix);
  54                 return false;
  55         }
  56         if (!this->Instance->IsSID(sid))
  57         {
  58                 this->SendError("Invalid format server ID: "+sid+"!");
  59                 return false;
  60         }
  61         TreeServer* CheckDupe = Utils->FindServer(servername);
  62         if (CheckDupe)
  63         {
  64                 this->SendError("Server "+servername+" already exists!");
  65                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+servername+"\2 being introduced from \2" + prefix + "\2 denied, already exists. Closing link with " + prefix);
  66                 return false;
  67         }
  68
  69         Link* lnk = Utils->FindLink(servername);
  70
  71         TreeServer *Node = new TreeServer(this->Utils, this->Instance, servername, description, sid, ParentOfThis,NULL, lnk ? lnk->Hidden : false);
  72
  73         if (Node->DuplicateID())
  74         {
  75                 this->SendError("Server ID "+sid+" already exists on the network!");
  76                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+servername+"\2 being introduced from \2" + prefix + "\2 denied, server ID already exists on the network. Closing link with " + prefix);
  77                 return false;
  78         }
  79
  80         ParentOfThis->AddChild(Node);
  81         params[4] = ":" + params[4];
  82         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
  83         this->Instance->SNO->WriteToSnoMask('l',"Server \002"+prefix+"\002 introduced server \002"+servername+"\002 ("+description+")");
  84         return true;
  85 }
  86
  87
  88 /*
  89  * This is used after the other side of a connection has accepted our credentials.
  90  * They are then introducing themselves to us, BEFORE either of us burst. -- w
  91  */
  92 bool TreeSocket::Outbound_Reply_Server(std::deque<std::string> &params)
  93 {
  94         if (params.size() < 5)
  95         {
  96                 SendError("Protocol error - Missing SID");
  97                 return false;
  98         }
  99
 100         irc::string servername = params[0].c_str();
 101         std::string sname = params[0];
 102         std::string password = params[1];
 103         std::string sid = params[3];
 104         std::string description = params[4];
 105         int hops = atoi(params[2].c_str());
 106
 107         this->InboundServerName = sname;
 108         this->InboundDescription = description;
 109         this->InboundSID = sid;
 110
 111         if (!sentcapab)
 112                 this->SendCapabilities();
 113
 114         if (hops)
 115         {
 116                 this->SendError("Server too far away for authentication");
 117                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 118                 return false;
 119         }
 120
 121         if (!this->Instance->IsSID(sid))
 122         {
 123                 this->SendError("Invalid format server ID: "+sid+"!");
 124                 return false;
 125         }
 126
 127         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 128         {
 129                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password)) || (x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 130                 {
 131                         TreeServer* CheckDupe = Utils->FindServer(sname);
 132                         if (CheckDupe)
 133                         {
 134                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 135                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 136                                 return false;
 137                         }
 138
 139                         /*
 140                          * They're in WAIT_AUTH_2 (having accepted our credentials).
 141                          * Set our state to CONNECTED (since everything's peachy so far) and send our
 142                          * netburst to them, which will trigger their CONNECTED state, and BURST in reply.
 143                          *
 144                          * While we're at it, create a treeserver object so we know about them.
 145                          *   -- w
 146                          */
 147                         this->LinkState = CONNECTED;
 148
 149                         TreeServer *Node = new TreeServer(this->Utils, this->Instance, sname, description, sid, Utils->TreeRoot, this, x->Hidden);
 150
 151                         if (Node->DuplicateID())
 152                         {
 153                                 this->SendError("Server ID "+sid+" already exists on the network!");
 154                                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+assign(servername)+"\2 being introduced denied, server ID already exists on the network. Closing link.");
 155                                 return false;
 156                         }
 157
 158                         Utils->TreeRoot->AddChild(Node);
 159                         params[4] = ":" + params[4];
 160                         Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,sname);
 161                         Node->bursting = true;
 162                         this->DoBurst(Node);
 163                         return true;
 164                 }
 165         }
 166         this->SendError("Invalid credentials");
 167         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 168         return false;
 169 }
 170
 171 /*
 172  * Someone else is attempting to connect to us if this is called. Validate their credentials etc.
 173  *              -- w
 174  */
 175 bool TreeSocket::Inbound_Server(std::deque<std::string> &params)
 176 {
 177         if (params.size() < 5)
 178         {
 179                 SendError("Protocol error - Missing SID");
 180                 return false;
 181         }
 182
 183         irc::string servername = params[0].c_str();
 184         std::string sname = params[0];
 185         std::string password = params[1];
 186         std::string sid = params[3];
 187         std::string description = params[4];
 188         int hops = atoi(params[2].c_str());
 189
 190         this->InboundServerName = sname;
 191         this->InboundDescription = description;
 192         this->InboundSID = sid;
 193
 194         if (!sentcapab)
 195                 this->SendCapabilities();
 196
 197         if (hops)
 198         {
 199                 this->SendError("Server too far away for authentication");
 200                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 201                 return false;
 202         }
 203
 204         if (!this->Instance->IsSID(sid))
 205         {
 206                 this->SendError("Invalid format server ID: "+sid+"!");
 207                 return false;
 208         }
 209
 210         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 211         {
 212                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password) || x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 213                 {
 214                         /* Check for fully initialized instances of the server by id */
 215                         Instance->Logs->Log("m_spanningtree",DEBUG,"Looking for dupe SID %s", sid.c_str());
 216                         TreeServer* CheckDupeSID = Utils->FindServerID(sid);
 217                         if (CheckDupeSID)
 218                         {
 219                                 this->SendError("Server ID "+CheckDupeSID->GetID()+" already exists on server "+CheckDupeSID->GetName()+"!");
 220                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server ID '"+CheckDupeSID->GetID()+
 221                                                 "' already exists on server "+CheckDupeSID->GetName());
 222                                 return false;
 223                         }
 224                         /* Now check for fully initialized instances of the server by name */
 225                         TreeServer* CheckDupe = Utils->FindServer(sname);
 226                         if (CheckDupe)
 227                         {
 228                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 229                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 230                                 return false;
 231                         }
 232                         this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
 233                         if (this->Hook)
 234                         {
 235                                 std::string name = BufferedSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
 236                                 this->Instance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
 237                         }
 238
 239                         // this is good. Send our details: Our server name and description and hopcount of 0,
 240                         // along with the sendpass from this block.
 241                         this->SendCapabilities();
 242                         this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 243                         // move to the next state, we are now waiting for THEM.
 244                         this->LinkState = WAIT_AUTH_2;
 245                         return true;
 246                 }
 247         }
 248         this->SendError("Invalid credentials");
 249         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 250         return false;
 251 }
 252