src/modules/m_spanningtree/server.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 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 "socketengine.h"
  18
  19 #include "main.h"
  20 #include "utils.h"
  21 #include "link.h"
  22 #include "treeserver.h"
  23 #include "treesocket.h"
  24
  25 /* $ModDep: m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/treesocket.h m_spanningtree/link.h */
  26
  27 /*
  28  * Some server somewhere in the network introducing another server.
  29  *      -- w
  30  */
  31 bool TreeSocket::RemoteServer(const std::string &prefix, parameterlist &params)
  32 {
  33         if (params.size() < 5)
  34         {
  35                 SendError("Protocol error - Not enough parameters for SERVER command");
  36                 return false;
  37         }
  38
  39         std::string servername = params[0];
  40         // password is not used for a remote server
  41         // hopcount is not used (ever)
  42         std::string sid = params[3];
  43         std::string description = params[4];
  44         TreeServer* ParentOfThis = Utils->FindServer(prefix);
  45
  46         if (!ParentOfThis)
  47         {
  48                 this->SendError("Protocol error - Introduced remote server from unknown server "+prefix);
  49                 return false;
  50         }
  51         if (!ServerInstance->IsSID(sid))
  52         {
  53                 this->SendError("Invalid format server ID: "+sid+"!");
  54                 return false;
  55         }
  56         TreeServer* CheckDupe = Utils->FindServer(servername);
  57         if (CheckDupe)
  58         {
  59                 this->SendError("Server "+servername+" already exists!");
  60                 ServerInstance->SNO->WriteToSnoMask('L', "Server \2"+CheckDupe->GetName()+"\2 being introduced from \2" + ParentOfThis->GetName() + "\2 denied, already exists. Closing link with " + ParentOfThis->GetName());
  61                 return false;
  62         }
  63         CheckDupe = Utils->FindServer(sid);
  64         if (CheckDupe)
  65         {
  66                 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.");
  67                 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());
  68                 return false;
  69         }
  70
  71
  72         Link* lnk = Utils->FindLink(servername);
  73
  74         TreeServer *Node = new TreeServer(Utils, servername, description, sid, ParentOfThis,NULL, lnk ? lnk->Hidden : false);
  75
  76         ParentOfThis->AddChild(Node);
  77         params[4] = ":" + params[4];
  78         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
  79         ServerInstance->SNO->WriteToSnoMask('L', "Server \002"+ParentOfThis->GetName()+"\002 introduced server \002"+servername+"\002 ("+description+")");
  80         return true;
  81 }
  82
  83
  84 /*
  85  * This is used after the other side of a connection has accepted our credentials.
  86  * They are then introducing themselves to us, BEFORE either of us burst. -- w
  87  */
  88 bool TreeSocket::Outbound_Reply_Server(parameterlist &params)
  89 {
  90         if (params.size() < 5)
  91         {
  92                 SendError("Protocol error - Not enough parameters for SERVER command");
  93                 return false;
  94         }
  95
  96         irc::string servername = params[0].c_str();
  97         std::string sname = params[0];
  98         std::string password = params[1];
  99         std::string sid = params[3];
 100         std::string description = params[4];
 101         int hops = atoi(params[2].c_str());
 102
 103         this->SendCapabilities(2);
 104
 105         if (hops)
 106         {
 107                 this->SendError("Server too far away for authentication");
 108                 ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 109                 return false;
 110         }
 111
 112         if (!ServerInstance->IsSID(sid))
 113         {
 114                 this->SendError("Invalid format server ID: "+sid+"!");
 115                 return false;
 116         }
 117
 118         for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i < Utils->LinkBlocks.end(); i++)
 119         {
 120                 Link* x = *i;
 121                 if (x->Name != servername && x->Name != "*") // open link allowance
 122                         continue;
 123
 124                 if (!ComparePass(*x, password))
 125                 {
 126                         ServerInstance->SNO->WriteToSnoMask('l',"Invalid password on link: %s", x->Name.c_str());
 127                         continue;
 128                 }
 129
 130                 TreeServer* CheckDupe = Utils->FindServer(sname);
 131                 if (CheckDupe)
 132                 {
 133                         this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 134                         ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 135                         return false;
 136                 }
 137                 CheckDupe = Utils->FindServer(sid);
 138                 if (CheckDupe)
 139                 {
 140                         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.");
 141                         ServerInstance->SNO->WriteToSnoMask('l',"Server \2"+assign(servername)+"\2 being introduced denied, server ID already exists on the network. Closing link.");
 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                 Utils->timeoutlist.erase(this);
 156                 linkID = sname;
 157
 158                 MyRoot = new TreeServer(Utils, sname, description, sid, Utils->TreeRoot, this, x->Hidden);
 159
 160                 Utils->TreeRoot->AddChild(MyRoot);
 161                 params[4] = ":" + params[4];
 162
 163                 /* IMPORTANT: Take password/hmac hash OUT of here before we broadcast the introduction! */
 164                 params[1] = "*";
 165                 Utils->DoOneToAllButSender(ServerInstance->Config->GetSID(),"SERVER",params,sname);
 166
 167                 this->DoBurst(MyRoot);
 168                 return true;
 169         }
 170
 171         this->SendError("Invalid credentials (check the other server's linking snomask for more information)");
 172         ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 173         return false;
 174 }
 175
 176 /*
 177  * Someone else is attempting to connect to us if this is called. Validate their credentials etc.
 178  *              -- w
 179  */
 180 bool TreeSocket::Inbound_Server(parameterlist &params)
 181 {
 182         if (params.size() < 5)
 183         {
 184                 SendError("Protocol error - Missing SID");
 185                 return false;
 186         }
 187
 188         irc::string servername = params[0].c_str();
 189         std::string sname = params[0];
 190         std::string password = params[1];
 191         std::string sid = params[3];
 192         std::string description = params[4];
 193         int hops = atoi(params[2].c_str());
 194
 195         this->SendCapabilities(2);
 196
 197         if (hops)
 198         {
 199                 this->SendError("Server too far away for authentication");
 200                 ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 201                 return false;
 202         }
 203
 204         if (!ServerInstance->IsSID(sid))
 205         {
 206                 this->SendError("Invalid format server ID: "+sid+"!");
 207                 return false;
 208         }
 209
 210         for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i < Utils->LinkBlocks.end(); i++)
 211         {
 212                 Link* x = *i;
 213                 if (x->Name != servername && x->Name != "*") // open link allowance
 214                         continue;
 215
 216                 if (!ComparePass(*x, password))
 217                 {
 218                         ServerInstance->SNO->WriteToSnoMask('l',"Invalid password on link: %s", x->Name.c_str());
 219                         continue;
 220                 }
 221
 222                 /* Now check for fully initialized ServerInstances of the server by name */
 223                 TreeServer* CheckDupe = Utils->FindServer(sname);
 224                 if (CheckDupe)
 225                 {
 226                         std::string pname = CheckDupe->GetParent() ? CheckDupe->GetParent()->GetName() : "<ourself>";
 227                         SendError("Server "+sname+" already exists on server "+pname+"!");
 228                         ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+pname);
 229                         return false;
 230                 }
 231
 232                 /* Check for fully initialized instances of the server by id */
 233                 ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Looking for dupe SID %s", sid.c_str());
 234                 CheckDupe = Utils->FindServerID(sid);
 235
 236                 if (CheckDupe)
 237                 {
 238                         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.");
 239                         ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server ID '"+CheckDupe->GetID()+
 240                                         "' already exists on server "+CheckDupe->GetName());
 241                         return false;
 242                 }
 243
 244                 ServerInstance->SNO->WriteToSnoMask('l',"Verified incoming server connection " + linkID + " ("+description+")");
 245                 linkID = sname;
 246
 247                 // this is good. Send our details: Our server name and description and hopcount of 0,
 248                 // along with the sendpass from this block.
 249                 this->SendCapabilities(2);
 250                 this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 251                 // move to the next state, we are now waiting for THEM.
 252                 MyRoot = new TreeServer(Utils, sname, description, sid, Utils->TreeRoot, this, x->Hidden);
 253                 Utils->TreeRoot->AddChild(MyRoot);
 254
 255                 params[1] = "*";
 256                 params[4] = ":" + params[4];
 257                 Utils->DoOneToAllButSender(ServerInstance->Config->GetSID(),"SERVER",params,sname);
 258
 259                 this->LinkState = WAIT_AUTH_2;
 260                 return true;
 261         }
 262
 263         this->SendError("Invalid credentials");
 264         ServerInstance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 265         return false;
 266 }
 267