src/modules/m_spanningtree/server.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 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 - Not enough parameters for SERVER command");
  39                 return false;
  40         }
  41
  42         std::string servername = params[0];
  43         // password is not used for a remote server
  44         // hopcount is not used (ever)
  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->ServerInstance->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 "+servername+" already exists!");
  63                 this->ServerInstance->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         CheckDupe = Utils->FindServer(sid);
  67         if (CheckDupe)
  68         {
  69                 this->SendError("Server ID "+sid+" already exists! You may want to specify the server ID for the server manually with <server:id> so they do not conflict.");
  70                 this->ServerInstance->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());
  71                 return false;
  72         }
  73
  74
  75         Link* lnk = Utils->FindLink(servername);
  76
  77         TreeServer *Node = new TreeServer(this->Utils, this->ServerInstance, servername, description, sid, ParentOfThis,NULL, lnk ? lnk->Hidden : false);
  78
  79         ParentOfThis->AddChild(Node);
  80         params[4] = ":" + params[4];
  81         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
  82         this->ServerInstance->SNO->WriteToSnoMask('L', "Server \002"+ParentOfThis->GetName()+"\002 introduced server \002"+servername+"\002 ("+description+")");
  83         return true;
  84 }
  85
  86
  87 /*
  88  * This is used after the other side of a connection has accepted our credentials.
  89  * They are then introducing themselves to us, BEFORE either of us burst. -- w
  90  */
  91 bool TreeSocket::Outbound_Reply_Server(std::deque<std::string> &params)
  92 {
  93         if (params.size() < 5)
  94         {
  95                 SendError("Protocol error - Not enough parameters for SERVER command");
  96                 return false;
  97         }
  98
  99         irc::string servername = params[0].c_str();
 100         std::string sname = params[0];
 101         std::string password = params[1];
 102         std::string sid = params[3];
 103         std::string description = params[4];
 104         int hops = atoi(params[2].c_str());
 105
 106         this->InboundServerName = sname;
 107         this->InboundDescription = description;
 108         this->InboundSID = sid;
 109
 110         if (!sentcapab)
 111                 this->SendCapabilities();
 112
 113         if (hops)
 114         {
 115                 this->SendError("Server too far away for authentication");
 116                 this->ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 117                 return false;
 118         }
 119
 120         if (!this->ServerInstance->IsSID(sid))
 121         {
 122                 this->SendError("Invalid format server ID: "+sid+"!");
 123                 return false;
 124         }
 125
 126         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 127         {
 128                 if (x->Name != servername && x->Name != "*") // open link allowance
 129                         continue;
 130
 131                 if (!ComparePass(this->MakePass(x->RecvPass, this->GetOurChallenge()), password) &&
 132                         (x->RecvPass != password && this->GetTheirChallenge().empty()))
 133                 {
 134                         this->ServerInstance->SNO->WriteToSnoMask('l',"Invalid password on link: %s", x->Name.c_str());
 135                         continue;
 136                 }
 137
 138                 TreeServer* CheckDupe = Utils->FindServer(sname);
 139                 if (CheckDupe)
 140                 {
 141                         this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 142                         this->ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 143                         return false;
 144                 }
 145                 CheckDupe = Utils->FindServer(sid);
 146                 if (CheckDupe)
 147                 {
 148                         this->SendError("Server ID "+sid+" already exists on the network! You may want to specify the server ID for the server manually with <server:id> so they do not conflict.");
 149                         this->ServerInstance->SNO->WriteToSnoMask('l',"Server \2"+assign(servername)+"\2 being introduced denied, server ID already exists on the network. Closing link.");
 150                         return false;
 151                 }
 152
 153                 /*
 154                  * They're in WAIT_AUTH_2 (having accepted our credentials).
 155                  * Set our state to CONNECTED (since everything's peachy so far) and send our
 156                  * netburst to them, which will trigger their CONNECTED state, and BURST in reply.
 157                  *
 158                  * While we're at it, create a treeserver object so we know about them.
 159                  *   -- w
 160                  */
 161                 this->LinkState = CONNECTED;
 162
 163                 Utils->timeoutlist.erase(this);
 164
 165                 TreeServer *Node = new TreeServer(this->Utils, this->ServerInstance, sname, description, sid, Utils->TreeRoot, this, x->Hidden);
 166
 167                 Utils->TreeRoot->AddChild(Node);
 168                 params[4] = ":" + params[4];
 169
 170
 171                 /* IMPORTANT: Take password/hmac hash OUT of here before we broadcast the introduction! */
 172                 params[1] = "*";
 173                 Utils->DoOneToAllButSender(ServerInstance->Config->GetSID(),"SERVER",params,sname);
 174
 175                 Node->bursting = true;
 176                 this->DoBurst(Node);
 177                 return true;
 178         }
 179
 180         this->SendError("Invalid credentials (check the other server's linking snomask for more information)");
 181         this->ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 182         return false;
 183 }
 184
 185 /*
 186  * Someone else is attempting to connect to us if this is called. Validate their credentials etc.
 187  *              -- w
 188  */
 189 bool TreeSocket::Inbound_Server(std::deque<std::string> &params)
 190 {
 191         if (params.size() < 5)
 192         {
 193                 SendError("Protocol error - Missing SID");
 194                 return false;
 195         }
 196
 197         irc::string servername = params[0].c_str();
 198         std::string sname = params[0];
 199         std::string password = params[1];
 200         std::string sid = params[3];
 201         std::string description = params[4];
 202         int hops = atoi(params[2].c_str());
 203
 204         this->InboundServerName = sname;
 205         this->InboundDescription = description;
 206         this->InboundSID = sid;
 207
 208         if (!sentcapab)
 209                 this->SendCapabilities();
 210
 211         if (hops)
 212         {
 213                 this->SendError("Server too far away for authentication");
 214                 this->ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 215                 return false;
 216         }
 217
 218         if (!this->ServerInstance->IsSID(sid))
 219         {
 220                 this->SendError("Invalid format server ID: "+sid+"!");
 221                 return false;
 222         }
 223
 224         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 225         {
 226                 if (x->Name != servername && x->Name != "*") // open link allowance
 227                         continue;
 228
 229                 if (!ComparePass(this->MakePass(x->RecvPass, this->GetOurChallenge()), password) &&
 230                         (x->RecvPass != password && this->GetTheirChallenge().empty()))
 231                 {
 232                         this->ServerInstance->SNO->WriteToSnoMask('l',"Invalid password on link: %s", x->Name.c_str());
 233                         continue;
 234                 }
 235
 236                 /* Now check for fully initialized ServerInstances of the server by name */
 237                 TreeServer* CheckDupe = Utils->FindServer(sname);
 238                 if (CheckDupe)
 239                 {
 240                         this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 241                         this->ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 242                         return false;
 243                 }
 244
 245                 /* Check for fully initialized instances of the server by id */
 246                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Looking for dupe SID %s", sid.c_str());
 247                 CheckDupe = Utils->FindServerID(sid);
 248
 249                 if (CheckDupe)
 250                 {
 251                         this->SendError("Server ID "+CheckDupe->GetID()+" already exists on server "+CheckDupe->GetName()+"! You may want to specify the server ID for the server manually with <server:id> so they do not conflict.");
 252                         this->ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server ID '"+CheckDupe->GetID()+
 253                                         "' already exists on server "+CheckDupe->GetName());
 254                         return false;
 255                 }
 256
 257
 258                 this->ServerInstance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
 259                 if (this->Hook)
 260                 {
 261                         std::string name = BufferedSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
 262                         this->ServerInstance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
 263                 }
 264
 265                 // this is good. Send our details: Our server name and description and hopcount of 0,
 266                 // along with the sendpass from this block.
 267                 this->SendCapabilities();
 268                 this->WriteLine(std::string("SERVER ")+this->ServerInstance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+ServerInstance->Config->GetSID()+" :"+this->ServerInstance->Config->ServerDesc);
 269                 // move to the next state, we are now waiting for THEM.
 270                 this->LinkState = WAIT_AUTH_2;
 271                 return true;
 272         }
 273
 274         this->SendError("Invalid credentials");
 275         this->ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 276         return false;
 277 }
 278