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/link.h"
  26 #include "m_spanningtree/treeserver.h"
  27 #include "m_spanningtree/treesocket.h"
  28
  29 /* $ModDep: m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/treesocket.h m_spanningtree/link.h */
  30
  31 /*
  32  * Some server somewhere in the network introducing another server.
  33  *      -- w
  34  */
  35 bool TreeSocket::RemoteServer(const std::string &prefix, std::deque<std::string> &params)
  36 {
  37         if (params.size() < 5)
  38         {
  39                 SendError("Protocol error - Missing SID");
  40                 return false;
  41         }
  42
  43         std::string servername = params[0];
  44         std::string password = params[1];
  45         // hopcount is not used for a remote server, we calculate this ourselves
  46         std::string sid = params[3];
  47         std::string description = params[4];
  48         TreeServer* ParentOfThis = Utils->FindServer(prefix);
  49
  50         if (!ParentOfThis)
  51         {
  52                 this->SendError("Protocol error - Introduced remote server from unknown server "+ParentOfThis->GetName());
  53                 return false;
  54         }
  55         if (!this->Instance->IsSID(sid))
  56         {
  57                 this->SendError("Invalid format server ID: "+sid+"!");
  58                 return false;
  59         }
  60         TreeServer* CheckDupe = Utils->FindServer(servername);
  61         if (CheckDupe)
  62         {
  63                 this->SendError("Server "+CheckDupe->GetName()+" already exists!");
  64                 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());
  65                 return false;
  66         }
  67
  68         Link* lnk = Utils->FindLink(servername);
  69
  70         TreeServer *Node = new TreeServer(this->Utils, this->Instance, servername, description, sid, ParentOfThis,NULL, lnk ? lnk->Hidden : false);
  71
  72         if (Node->DuplicateID())
  73         {
  74                 this->SendError("Server ID "+servername+" already exists on the network!");
  75                 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());
  76                 return false;
  77         }
  78
  79         ParentOfThis->AddChild(Node);
  80         params[4] = ":" + params[4];
  81         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
  82         this->Instance->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 - Missing SID");
  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->Instance->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->Instance->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->Instance->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->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 143                         return false;
 144                 }
 145
 146                 /*
 147                  * They're in WAIT_AUTH_2 (having accepted our credentials).
 148                  * Set our state to CONNECTED (since everything's peachy so far) and send our
 149                  * netburst to them, which will trigger their CONNECTED state, and BURST in reply.
 150                  *
 151                  * While we're at it, create a treeserver object so we know about them.
 152                  *   -- w
 153                  */
 154                 this->LinkState = CONNECTED;
 155
 156                 TreeServer *Node = new TreeServer(this->Utils, this->Instance, sname, description, sid, Utils->TreeRoot, this, x->Hidden);
 157
 158                 if (Node->DuplicateID())
 159                 {
 160                         this->SendError("Server ID "+sid+" already exists on the network!");
 161                         this->Instance->SNO->WriteToSnoMask('l',"Server \2"+assign(servername)+"\2 being introduced denied, server ID already exists on the network. Closing link.");
 162                         return false;
 163                 }
 164
 165                 Utils->TreeRoot->AddChild(Node);
 166                 params[4] = ":" + params[4];
 167
 168
 169                 /* IMPORTANT: Take password/hmac hash OUT of here before we broadcast the introduction! */
 170                 params[1] = "*";
 171                 Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,sname);
 172
 173                 Node->bursting = true;
 174                 this->DoBurst(Node);
 175                 return true;
 176         }
 177
 178         this->SendError("Invalid credentials (check the other server's linking snomask for more information)");
 179         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 180         return false;
 181 }
 182
 183 /*
 184  * Someone else is attempting to connect to us if this is called. Validate their credentials etc.
 185  *              -- w
 186  */
 187 bool TreeSocket::Inbound_Server(std::deque<std::string> &params)
 188 {
 189         if (params.size() < 5)
 190         {
 191                 SendError("Protocol error - Missing SID");
 192                 return false;
 193         }
 194
 195         irc::string servername = params[0].c_str();
 196         std::string sname = params[0];
 197         std::string password = params[1];
 198         std::string sid = params[3];
 199         std::string description = params[4];
 200         int hops = atoi(params[2].c_str());
 201
 202         this->InboundServerName = sname;
 203         this->InboundDescription = description;
 204         this->InboundSID = sid;
 205
 206         if (!sentcapab)
 207                 this->SendCapabilities();
 208
 209         if (hops)
 210         {
 211                 this->SendError("Server too far away for authentication");
 212                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 213                 return false;
 214         }
 215
 216         if (!this->Instance->IsSID(sid))
 217         {
 218                 this->SendError("Invalid format server ID: "+sid+"!");
 219                 return false;
 220         }
 221
 222         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 223         {
 224                 if (x->Name != servername && x->Name != "*") // open link allowance
 225                         continue;
 226
 227                 if (!ComparePass(this->MakePass(x->RecvPass, this->GetOurChallenge()), password) &&
 228                         (x->RecvPass != password && this->GetTheirChallenge().empty()))
 229                 {
 230                         this->Instance->SNO->WriteToSnoMask('l',"Invalid password on link: %s", x->Name.c_str());
 231                         continue;
 232                 }
 233
 234                 /* Check for fully initialized instances of the server by id */
 235                 Instance->Logs->Log("m_spanningtree",DEBUG,"Looking for dupe SID %s", sid.c_str());
 236                 TreeServer* CheckDupeSID = Utils->FindServerID(sid);
 237
 238                 if (CheckDupeSID)
 239                 {
 240                         this->SendError("Server ID "+CheckDupeSID->GetID()+" already exists on server "+CheckDupeSID->GetName()+"!");
 241                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server ID '"+CheckDupeSID->GetID()+
 242                                         "' already exists on server "+CheckDupeSID->GetName());
 243                         return false;
 244                 }
 245
 246                 /* Now check for fully initialized instances of the server by name */
 247                 TreeServer* CheckDupe = Utils->FindServer(sname);
 248                 if (CheckDupe)
 249                 {
 250                         this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 251                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 252                         return false;
 253                 }
 254
 255                 this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
 256                 if (this->Hook)
 257                 {
 258                         std::string name = BufferedSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
 259                         this->Instance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
 260                 }
 261
 262                 // this is good. Send our details: Our server name and description and hopcount of 0,
 263                 // along with the sendpass from this block.
 264                 this->SendCapabilities();
 265                 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 266                 // move to the next state, we are now waiting for THEM.
 267                 this->LinkState = WAIT_AUTH_2;
 268                 return true;
 269         }
 270
 271         this->SendError("Invalid credentials");
 272         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 273         return false;
 274 }
 275