src/modules/m_spanningtree/capab.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 "xline.h"
  16
  17 #include "treesocket.h"
  18 #include "treeserver.h"
  19 #include "utils.h"
  20 #include "main.h"
  21
  22 /* $ModDep: m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/treesocket.h */
  23
  24
  25 std::string TreeSocket::MyCapabilities()
  26 {
  27         std::vector<std::string> modlist = this->ServerInstance->Modules->GetAllModuleNames(VF_COMMON);
  28         std::string capabilities;
  29         sort(modlist.begin(),modlist.end());
  30         for (unsigned int i = 0; i < modlist.size(); i++)
  31         {
  32                 if (i)
  33                         capabilities = capabilities + ",";
  34                 capabilities = capabilities + modlist[i];
  35         }
  36         return capabilities;
  37 }
  38
  39 void TreeSocket::SendCapabilities()
  40 {
  41         if (sentcapab)
  42                 return;
  43
  44         sentcapab = true;
  45         irc::commasepstream modulelist(MyCapabilities());
  46         this->WriteLine("CAPAB START");
  47
  48         /* Send module names, split at 509 length */
  49         std::string item;
  50         std::string line = "CAPAB MODULES ";
  51         while (modulelist.GetToken(item))
  52         {
  53                 if (line.length() + item.length() + 1 > 509)
  54                 {
  55                         this->WriteLine(line);
  56                         line = "CAPAB MODULES ";
  57                 }
  58
  59                 if (line != "CAPAB MODULES ")
  60                         line.append(",");
  61
  62                 line.append(item);
  63         }
  64         if (line != "CAPAB MODULES ")
  65                 this->WriteLine(line);
  66
  67         int ip6 = 0;
  68 #ifdef IPV6
  69         ip6 = 1;
  70 #endif
  71         std::string extra;
  72         /* Do we have sha256 available? If so, we send a challenge */
  73         if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
  74         {
  75                 this->SetOurChallenge(RandString(20));
  76                 extra = " CHALLENGE=" + this->GetOurChallenge();
  77         }
  78
  79         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
  80                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
  81                         " HALFOP="+ConvToStr(ServerInstance->Config->AllowHalfop)+
  82                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
  83                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
  84                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
  85                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
  86                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
  87                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
  88                         " MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
  89                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
  90                         " IP6NATIVE="+ConvToStr(ip6)+
  91                         " IP6SUPPORT=1"+
  92                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
  93                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
  94                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
  95                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
  96                         " SVSPART=1");
  97
  98         this->WriteLine("CAPAB END");
  99 }
 100
 101 /* Check a comma seperated list for an item */
 102 bool TreeSocket::HasItem(const std::string &list, const std::string &item)
 103 {
 104         irc::commasepstream seplist(list);
 105         std::string item2;
 106
 107         while (seplist.GetToken(item2))
 108         {
 109                 if (item2 == item)
 110                         return true;
 111         }
 112         return false;
 113 }
 114
 115 /* Isolate and return the elements that are different between two comma seperated lists */
 116 std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
 117 {
 118         irc::commasepstream list_one(one);
 119         std::string item;
 120         std::string result;
 121         while (list_one.GetToken(item))
 122         {
 123                 if (!HasItem(two, item))
 124                 {
 125                         result.append(" ");
 126                         result.append(item);
 127                 }
 128         }
 129         return result;
 130 }
 131
 132 bool TreeSocket::Capab(const std::deque<std::string> &params)
 133 {
 134         if (params.size() < 1)
 135         {
 136                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 137                 return false;
 138         }
 139         if (params[0] == "START")
 140         {
 141                 this->ModuleList.clear();
 142                 this->CapKeys.clear();
 143         }
 144         else if (params[0] == "END")
 145         {
 146                 std::string reason;
 147                 /* Compare ModuleList and check CapKeys */
 148                 if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
 149                 {
 150                         std::string diffIneed = ListDifference(this->ModuleList, this->MyCapabilities());
 151                         std::string diffUneed = ListDifference(this->MyCapabilities(), this->ModuleList);
 152                         if (diffIneed.length() == 0 && diffUneed.length() == 0)
 153                         {
 154                                 reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 155                         }
 156                         else
 157                         {
 158                                 reason = "Modules incorrectly matched on these servers.";
 159                                 if (diffIneed.length())
 160                                         reason += " Not loaded here:" + diffIneed;
 161                                 if (diffUneed.length())
 162                                         reason += " Not loaded there:" + diffUneed;
 163                         }
 164                         this->SendError("CAPAB negotiation failed: "+reason);
 165                         return false;
 166                 }
 167                 if (this->CapKeys.find("PROTOCOL") == this->CapKeys.end())
 168                 {
 169                         reason = "Protocol version not specified";
 170                 }
 171                 else
 172                 {
 173                         int otherProto = atoi(CapKeys.find("PROTOCOL")->second.c_str());
 174                         if (otherProto < MinCompatProtocol)
 175                         {
 176                                 reason = "Server is using protocol version " + ConvToStr(otherProto) +
 177                                         " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 178                                         + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
 179                         }
 180                 }
 181
 182                 if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != this->ServerInstance->Modes->BuildPrefixes())
 183                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 184
 185                 if(this->CapKeys.find("CHANMODES") != this->CapKeys.end() && this->CapKeys.find("CHANMODES")->second != this->ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
 186                         reason = "One or more of the channel modes on the remote server are invalid on this server.";
 187
 188                 if(this->CapKeys.find("USERMODES") != this->CapKeys.end() && this->CapKeys.find("USERMODES")->second != this->ServerInstance->Modes->GiveModeList(MASK_USER))
 189                         reason = "One or more of the user modes on the remote server are invalid on this server.";
 190
 191
 192                 /* Challenge response, store their challenge for our password */
 193                 std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE");
 194                 if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
 195                 {
 196                         /* Challenge-response is on now */
 197                         this->SetTheirChallenge(n->second);
 198                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 199                         {
 200                                 this->SendCapabilities();
 201                                 this->WriteLine(std::string("SERVER ")+this->ServerInstance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 "+
 202                                                 ServerInstance->Config->GetSID()+" :"+this->ServerInstance->Config->ServerDesc);
 203                         }
 204                 }
 205                 else
 206                 {
 207                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 208                         if (this->LinkState == CONNECTING)
 209                         {
 210                                 this->SendCapabilities();
 211                                 this->WriteLine(std::string("SERVER ")+this->ServerInstance->Config->ServerName+" "+OutboundPass+" 0 "+ServerInstance->Config->GetSID()+" :"+this->ServerInstance->Config->ServerDesc);
 212                         }
 213                 }
 214
 215                 if (reason.length())
 216                 {
 217                         this->SendError("CAPAB negotiation failed: "+reason);
 218                         return false;
 219                 }
 220         }
 221         else if ((params[0] == "MODULES") && (params.size() == 2))
 222         {
 223                 if (!this->ModuleList.length())
 224                 {
 225                         this->ModuleList.append(params[1]);
 226                 }
 227                 else
 228                 {
 229                         this->ModuleList.append(",");
 230                         this->ModuleList.append(params[1]);
 231                 }
 232         }
 233
 234         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 235         {
 236                 irc::tokenstream capabs(params[1]);
 237                 std::string item;
 238                 bool more = true;
 239                 while ((more = capabs.GetToken(item)))
 240                 {
 241                         /* Process each key/value pair */
 242                         std::string::size_type equals = item.rfind('=');
 243                         if (equals != std::string::npos)
 244                         {
 245                                 std::string var = item.substr(0, equals);
 246                                 std::string value = item.substr(equals+1, item.length());
 247                                 CapKeys[var] = value;
 248                         }
 249                 }
 250         }
 251         return true;
 252 }
 253