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