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 "xline.h"
  19 #include "transport.h"
  20 #include "socketengine.h"
  21
  22 #include "m_spanningtree/main.h"
  23 #include "m_spanningtree/utils.h"
  24 #include "m_spanningtree/link.h"
  25 #include "m_spanningtree/treeserver.h"
  26 #include "m_spanningtree/treesocket.h"
  27
  28 /* $ModDep: m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/treesocket.h m_spanningtree/link.h */
  29
  30 /*
  31  * Some server somewhere in the network introducing another server.
  32  *      -- w
  33  */
  34 bool TreeSocket::RemoteServer(const std::string &prefix, std::deque<std::string> &params)
  35 {
  36         if (params.size() < 5)
  37         {
  38                 SendError("Protocol error - Missing SID");
  39                 return false;
  40         }
  41
  42         std::string servername = params[0];
  43         std::string password = params[1];
  44         // hopcount is not used for a remote server, we calculate this ourselves
  45         std::string sid = params[3];
  46         std::string description = params[4];
  47         TreeServer* ParentOfThis = Utils->FindServer(prefix);
  48
  49         if (!ParentOfThis)
  50         {
  51                 this->SendError("Protocol error - Introduced remote server from unknown server "+ParentOfThis->GetName());
  52                 return false;
  53         }
  54         if (!this->Instance->IsSID(sid))
  55         {
  56                 this->SendError("Invalid format server ID: "+sid+"!");
  57                 return false;
  58         }
  59         TreeServer* CheckDupe = Utils->FindServer(servername);
  60         if (CheckDupe)
  61         {
  62                 this->SendError("Server "+CheckDupe->GetName()+" already exists!");
  63                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+CheckDupe->GetName()+"\2 being introduced from \2" + ParentOfThis->GetName() + "\2 denied, already exists. Closing link with " + ParentOfThis->GetName());
  64                 return false;
  65         }
  66
  67         Link* lnk = Utils->FindLink(servername);
  68
  69         TreeServer *Node = new TreeServer(this->Utils, this->Instance, servername, description, sid, ParentOfThis,NULL, lnk ? lnk->Hidden : false);
  70
  71         if (Node->DuplicateID())
  72         {
  73                 this->SendError("Server ID "+servername+" already exists on the network!");
  74                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+servername+"\2 being introduced from \2" + ParentOfThis->GetName() + "\2 denied, server ID already exists on the network. Closing link with " + ParentOfThis->GetName());
  75                 return false;
  76         }
  77
  78         ParentOfThis->AddChild(Node);
  79         params[4] = ":" + params[4];
  80         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
  81         this->Instance->SNO->WriteToSnoMask('l',"Server \002"+ParentOfThis->GetName()+"\002 introduced server \002"+servername+"\002 ("+description+")");
  82         return true;
  83 }
  84
  85
  86 /*
  87  * This is used after the other side of a connection has accepted our credentials.
  88  * They are then introducing themselves to us, BEFORE either of us burst. -- w
  89  */
  90 bool TreeSocket::Outbound_Reply_Server(std::deque<std::string> &params)
  91 {
  92         if (params.size() < 5)
  93         {
  94                 SendError("Protocol error - Missing SID");
  95                 return false;
  96         }
  97
  98         irc::string servername = params[0].c_str();
  99         std::string sname = params[0];
 100         std::string password = params[1];
 101         std::string sid = params[3];
 102         std::string description = params[4];
 103         int hops = atoi(params[2].c_str());
 104
 105         this->InboundServerName = sname;
 106         this->InboundDescription = description;
 107         this->InboundSID = sid;
 108
 109         if (!sentcapab)
 110                 this->SendCapabilities();
 111
 112         if (hops)
 113         {
 114                 this->SendError("Server too far away for authentication");
 115                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 116                 return false;
 117         }
 118
 119         if (!this->Instance->IsSID(sid))
 120         {
 121                 this->SendError("Invalid format server ID: "+sid+"!");
 122                 return false;
 123         }
 124
 125         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 126         {
 127                 if (x->Name != servername && x->Name != "*") // open link allowance
 128                         continue;
 129
 130                 if (!ComparePass(this->MakePass(x->RecvPass, this->GetOurChallenge()), password) &&
 131                         (x->RecvPass != password && this->GetTheirChallenge().empty()))
 132                 {
 133                         this->Instance->SNO->WriteToSnoMask('l',"Invalid password on link: %s", x->Name.c_str());
 134                         continue;
 135                 }
 136
 137                 TreeServer* CheckDupe = Utils->FindServer(sname);
 138                 if (CheckDupe)
 139                 {
 140                         this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 141                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 142                         return false;
 143                 }
 144
 145                 /*
 146                  * They're in WAIT_AUTH_2 (having accepted our credentials).
 147                  * Set our state to CONNECTED (since everything's peachy so far) and send our
 148                  * netburst to them, which will trigger their CONNECTED state, and BURST in reply.
 149                  *
 150                  * While we're at it, create a treeserver object so we know about them.
 151                  *   -- w
 152                  */
 153                 this->LinkState = CONNECTED;
 154
 155                 TreeServer *Node = new TreeServer(this->Utils, this->Instance, sname, description, sid, Utils->TreeRoot, this, x->Hidden);
 156
 157                 if (Node->DuplicateID())
 158                 {
 159                         this->SendError("Server ID "+sid+" already exists on the network!");
 160                         this->Instance->SNO->WriteToSnoMask('l',"Server \2"+assign(servername)+"\2 being introduced denied, server ID already exists on the network. Closing link.");
 161                         return false;
 162                 }
 163
 164                 Utils->TreeRoot->AddChild(Node);
 165                 params[4] = ":" + params[4];
 166
 167
 168                 /* IMPORTANT: Take password/hmac hash OUT of here before we broadcast the introduction! */
 169                 params[1] = "*";
 170                 Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,sname);
 171
 172                 Node->bursting = true;
 173                 this->DoBurst(Node);
 174                 return true;
 175         }
 176
 177         this->SendError("Invalid credentials (check the other server's linking snomask for more information)");
 178         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 179         return false;
 180 }
 181
 182 /*
 183  * Someone else is attempting to connect to us if this is called. Validate their credentials etc.
 184  *              -- w
 185  */
 186 bool TreeSocket::Inbound_Server(std::deque<std::string> &params)
 187 {
 188         if (params.size() < 5)
 189         {
 190                 SendError("Protocol error - Missing SID");
 191                 return false;
 192         }
 193
 194         irc::string servername = params[0].c_str();
 195         std::string sname = params[0];
 196         std::string password = params[1];
 197         std::string sid = params[3];
 198         std::string description = params[4];
 199         int hops = atoi(params[2].c_str());
 200
 201         this->InboundServerName = sname;
 202         this->InboundDescription = description;
 203         this->InboundSID = sid;
 204
 205         if (!sentcapab)
 206                 this->SendCapabilities();
 207
 208         if (hops)
 209         {
 210                 this->SendError("Server too far away for authentication");
 211                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 212                 return false;
 213         }
 214
 215         if (!this->Instance->IsSID(sid))
 216         {
 217                 this->SendError("Invalid format server ID: "+sid+"!");
 218                 return false;
 219         }
 220
 221         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 222         {
 223                 if (x->Name != servername && x->Name != "*") // open link allowance
 224                         continue;
 225
 226                 if (!ComparePass(this->MakePass(x->RecvPass, this->GetOurChallenge()), password) &&
 227                         (x->RecvPass != password && this->GetTheirChallenge().empty()))
 228                 {
 229                         this->Instance->SNO->WriteToSnoMask('l',"Invalid password on link: %s", x->Name.c_str());
 230                         continue;
 231                 }
 232
 233                 /* Check for fully initialized instances of the server by id */
 234                 Instance->Logs->Log("m_spanningtree",DEBUG,"Looking for dupe SID %s", sid.c_str());
 235                 TreeServer* CheckDupeSID = Utils->FindServerID(sid);
 236
 237                 if (CheckDupeSID)
 238                 {
 239                         this->SendError("Server ID "+CheckDupeSID->GetID()+" already exists on server "+CheckDupeSID->GetName()+"!");
 240                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server ID '"+CheckDupeSID->GetID()+
 241                                         "' already exists on server "+CheckDupeSID->GetName());
 242                         return false;
 243                 }
 244
 245                 /* Now check for fully initialized instances of the server by name */
 246                 TreeServer* CheckDupe = Utils->FindServer(sname);
 247                 if (CheckDupe)
 248                 {
 249                         this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 250                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 251                         return false;
 252                 }
 253
 254                 this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
 255                 if (this->Hook)
 256                 {
 257                         std::string name = BufferedSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
 258                         this->Instance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
 259                 }
 260
 261                 // this is good. Send our details: Our server name and description and hopcount of 0,
 262                 // along with the sendpass from this block.
 263                 this->SendCapabilities();
 264                 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 265                 // move to the next state, we are now waiting for THEM.
 266                 this->LinkState = WAIT_AUTH_2;
 267                 return true;
 268         }
 269
 270         this->SendError("Invalid credentials");
 271         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 272         return false;
 273 }
 274