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
  52         if (!ParentOfThis)
  53         {
  54                 this->SendError("Protocol error - Introduced remote server from unknown server "+ParentOfThis->GetName());
  55                 return false;
  56         }
  57         if (!this->Instance->IsSID(sid))
  58         {
  59                 this->SendError("Invalid format server ID: "+sid+"!");
  60                 return false;
  61         }
  62         TreeServer* CheckDupe = Utils->FindServer(servername);
  63         if (CheckDupe)
  64         {
  65                 this->SendError("Server "+CheckDupe->GetName()+" already exists!");
  66                 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());
  67                 return false;
  68         }
  69
  70         Link* lnk = Utils->FindLink(servername);
  71
  72         TreeServer *Node = new TreeServer(this->Utils, this->Instance, servername, description, sid, ParentOfThis,NULL, lnk ? lnk->Hidden : false);
  73
  74         if (Node->DuplicateID())
  75         {
  76                 this->SendError("Server ID "+servername+" already exists on the network!");
  77                 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());
  78                 return false;
  79         }
  80
  81         ParentOfThis->AddChild(Node);
  82         params[4] = ":" + params[4];
  83         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
  84         this->Instance->SNO->WriteToSnoMask('l',"Server \002"+ParentOfThis->GetName()+"\002 introduced server \002"+servername+"\002 ("+description+")");
  85         return true;
  86 }
  87
  88
  89 /*
  90  * This is used after the other side of a connection has accepted our credentials.
  91  * They are then introducing themselves to us, BEFORE either of us burst. -- w
  92  */
  93 bool TreeSocket::Outbound_Reply_Server(std::deque<std::string> &params)
  94 {
  95         if (params.size() < 5)
  96         {
  97                 SendError("Protocol error - Missing SID");
  98                 return false;
  99         }
 100
 101         irc::string servername = params[0].c_str();
 102         std::string sname = params[0];
 103         std::string password = params[1];
 104         std::string sid = params[3];
 105         std::string description = params[4];
 106         int hops = atoi(params[2].c_str());
 107
 108         this->InboundServerName = sname;
 109         this->InboundDescription = description;
 110         this->InboundSID = sid;
 111
 112         if (!sentcapab)
 113                 this->SendCapabilities();
 114
 115         if (hops)
 116         {
 117                 this->SendError("Server too far away for authentication");
 118                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 119                 return false;
 120         }
 121
 122         if (!this->Instance->IsSID(sid))
 123         {
 124                 this->SendError("Invalid format server ID: "+sid+"!");
 125                 return false;
 126         }
 127
 128         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 129         {
 130                 if (x->Name != servername && x->Name != "*") // open link allowance
 131                         continue;
 132
 133                 if (!ComparePass(this->MakePass(x->RecvPass, this->GetOurChallenge(), password)) ||
 134                         x->RecvPass != password && !this->GetTheirChallenge().empty())
 135                         continue;
 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                 Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,sname);
 167                 Node->bursting = true;
 168                 this->DoBurst(Node);
 169                 return true;
 170         }
 171
 172         this->SendError("Invalid credentials");
 173         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 174         return false;
 175 }
 176
 177 /*
 178  * Someone else is attempting to connect to us if this is called. Validate their credentials etc.
 179  *              -- w
 180  */
 181 bool TreeSocket::Inbound_Server(std::deque<std::string> &params)
 182 {
 183         if (params.size() < 5)
 184         {
 185                 SendError("Protocol error - Missing SID");
 186                 return false;
 187         }
 188
 189         irc::string servername = params[0].c_str();
 190         std::string sname = params[0];
 191         std::string password = params[1];
 192         std::string sid = params[3];
 193         std::string description = params[4];
 194         int hops = atoi(params[2].c_str());
 195
 196         this->InboundServerName = sname;
 197         this->InboundDescription = description;
 198         this->InboundSID = sid;
 199
 200         if (!sentcapab)
 201                 this->SendCapabilities();
 202
 203         if (hops)
 204         {
 205                 this->SendError("Server too far away for authentication");
 206                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 207                 return false;
 208         }
 209
 210         if (!this->Instance->IsSID(sid))
 211         {
 212                 this->SendError("Invalid format server ID: "+sid+"!");
 213                 return false;
 214         }
 215
 216         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 217         {
 218                 if (x->Name != servername && x->Name != "*") // open link allowance
 219                         continue;
 220
 221                 if (!ComparePass(this->MakePass(x->RecvPass, this->GetOurChallenge(), password)) ||
 222                         x->RecvPass != password && !this->GetTheirChallenge().empty())
 223                         continue;
 224
 225                 /* Check for fully initialized instances of the server by id */
 226                 Instance->Logs->Log("m_spanningtree",DEBUG,"Looking for dupe SID %s", sid.c_str());
 227                 TreeServer* CheckDupeSID = Utils->FindServerID(sid);
 228
 229                 if (CheckDupeSID)
 230                 {
 231                         this->SendError("Server ID "+CheckDupeSID->GetID()+" already exists on server "+CheckDupeSID->GetName()+"!");
 232                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server ID '"+CheckDupeSID->GetID()+
 233                                         "' already exists on server "+CheckDupeSID->GetName());
 234                         return false;
 235                 }
 236
 237                 /* Now check for fully initialized instances of the server by name */
 238                 TreeServer* CheckDupe = Utils->FindServer(sname);
 239                 if (CheckDupe)
 240                 {
 241                         this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 242                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 243                         return false;
 244                 }
 245
 246                 this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
 247                 if (this->Hook)
 248                 {
 249                         std::string name = BufferedSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
 250                         this->Instance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
 251                 }
 252
 253                 // this is good. Send our details: Our server name and description and hopcount of 0,
 254                 // along with the sendpass from this block.
 255                 this->SendCapabilities();
 256                 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 257                 // move to the next state, we are now waiting for THEM.
 258                 this->LinkState = WAIT_AUTH_2;
 259                 return true;
 260         }
 261
 262         this->SendError("Invalid credentials");
 263         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 264         return false;
 265 }
 266