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         int ip6support = 0;
  69 #ifdef IPV6
  70         ip6 = 1;
  71 #endif
  72 #ifdef SUPPORT_IP6LINKS
  73         ip6support = 1;
  74 #endif
  75         std::string extra;
  76         /* Do we have sha256 available? If so, we send a challenge */
  77         if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
  78         {
  79                 this->SetOurChallenge(RandString(20));
  80                 extra = " CHALLENGE=" + this->GetOurChallenge();
  81         }
  82
  83         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
  84                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
  85                         " HALFOP="+ConvToStr(ServerInstance->Config->AllowHalfop)+
  86                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
  87                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
  88                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
  89                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
  90                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
  91                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
  92                         " MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
  93                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
  94                         " IP6NATIVE="+ConvToStr(ip6)+
  95                         " IP6SUPPORT="+ConvToStr(ip6support)+
  96                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
  97                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
  98                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
  99                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
 100                         " SVSPART=1");
 101
 102         this->WriteLine("CAPAB END");
 103 }
 104
 105 /* Check a comma seperated list for an item */
 106 bool TreeSocket::HasItem(const std::string &list, const std::string &item)
 107 {
 108         irc::commasepstream seplist(list);
 109         std::string item2;
 110
 111         while (seplist.GetToken(item2))
 112         {
 113                 if (item2 == item)
 114                         return true;
 115         }
 116         return false;
 117 }
 118
 119 /* Isolate and return the elements that are different between two comma seperated lists */
 120 std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
 121 {
 122         irc::commasepstream list_one(one);
 123         std::string item;
 124         std::string result;
 125         while (list_one.GetToken(item))
 126         {
 127                 if (!HasItem(two, item))
 128                 {
 129                         result.append(" ");
 130                         result.append(item);
 131                 }
 132         }
 133         return result;
 134 }
 135
 136 bool TreeSocket::Capab(const std::deque<std::string> &params)
 137 {
 138         if (params.size() < 1)
 139         {
 140                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 141                 return false;
 142         }
 143         if (params[0] == "START")
 144         {
 145                 this->ModuleList.clear();
 146                 this->CapKeys.clear();
 147         }
 148         else if (params[0] == "END")
 149         {
 150                 std::string reason;
 151                 int ip6support = 0;
 152 #ifdef SUPPORT_IP6LINKS
 153                 ip6support = 1;
 154 #endif
 155                 /* Compare ModuleList and check CapKeys...
 156                  * Maybe this could be tidier? -- Brain
 157                  */
 158                 if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
 159                 {
 160                         std::string diffIneed = ListDifference(this->ModuleList, this->MyCapabilities());
 161                         std::string diffUneed = ListDifference(this->MyCapabilities(), this->ModuleList);
 162                         if (diffIneed.length() == 0 && diffUneed.length() == 0)
 163                         {
 164                                 reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 165                         }
 166                         else
 167                         {
 168                                 reason = "Modules incorrectly matched on these servers.";
 169                                 if (diffIneed.length())
 170                                         reason += " Not loaded here:" + diffIneed;
 171                                 if (diffUneed.length())
 172                                         reason += " Not loaded there:" + diffUneed;
 173                         }
 174                         this->SendError("CAPAB negotiation failed: "+reason);
 175                         return false;
 176                 }
 177                 if (((this->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support))))
 178                         reason = "We don't both support linking to IPV6 servers";
 179                 if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support))
 180                         reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers";
 181                 if (this->CapKeys.find("PROTOCOL") == this->CapKeys.end())
 182                 {
 183                         reason = "Protocol version not specified";
 184                 }
 185                 else
 186                 {
 187                         int otherProto = atoi(CapKeys.find("PROTOCOL")->second.c_str());
 188                         if (otherProto < MinCompatProtocol)
 189                         {
 190                                 reason = "Server is using protocol version " + ConvToStr(otherProto) +
 191                                         " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 192                                         + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
 193                         }
 194                 }
 195
 196                 if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != this->ServerInstance->Modes->BuildPrefixes())
 197                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 198
 199                 if(this->CapKeys.find("CHANMODES") != this->CapKeys.end() && this->CapKeys.find("CHANMODES")->second != this->ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
 200                         reason = "One or more of the channel modes on the remote server are invalid on this server.";
 201
 202                 if(this->CapKeys.find("USERMODES") != this->CapKeys.end() && this->CapKeys.find("USERMODES")->second != this->ServerInstance->Modes->GiveModeList(MASK_USER))
 203                         reason = "One or more of the user modes on the remote server are invalid on this server.";
 204
 205
 206                 /* Challenge response, store their challenge for our password */
 207                 std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE");
 208                 if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
 209                 {
 210                         /* Challenge-response is on now */
 211                         this->SetTheirChallenge(n->second);
 212                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 213                         {
 214                                 this->SendCapabilities();
 215                                 this->WriteLine(std::string("SERVER ")+this->ServerInstance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 "+
 216                                                 ServerInstance->Config->GetSID()+" :"+this->ServerInstance->Config->ServerDesc);
 217                         }
 218                 }
 219                 else
 220                 {
 221                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 222                         if (this->LinkState == CONNECTING)
 223                         {
 224                                 this->SendCapabilities();
 225                                 this->WriteLine(std::string("SERVER ")+this->ServerInstance->Config->ServerName+" "+OutboundPass+" 0 "+ServerInstance->Config->GetSID()+" :"+this->ServerInstance->Config->ServerDesc);
 226                         }
 227                 }
 228
 229                 if (reason.length())
 230                 {
 231                         this->SendError("CAPAB negotiation failed: "+reason);
 232                         return false;
 233                 }
 234         }
 235         else if ((params[0] == "MODULES") && (params.size() == 2))
 236         {
 237                 if (!this->ModuleList.length())
 238                 {
 239                         this->ModuleList.append(params[1]);
 240                 }
 241                 else
 242                 {
 243                         this->ModuleList.append(",");
 244                         this->ModuleList.append(params[1]);
 245                 }
 246         }
 247
 248         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 249         {
 250                 irc::tokenstream capabs(params[1]);
 251                 std::string item;
 252                 bool more = true;
 253                 while ((more = capabs.GetToken(item)))
 254                 {
 255                         /* Process each key/value pair */
 256                         std::string::size_type equals = item.rfind('=');
 257                         if (equals != std::string::npos)
 258                         {
 259                                 std::string var = item.substr(0, equals);
 260                                 std::string value = item.substr(equals+1, item.length());
 261                                 CapKeys[var] = value;
 262                         }
 263                 }
 264         }
 265         return true;
 266 }
 267