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::MyModules(int filter)
  26 {
  27         std::vector<std::string> modlist = this->ServerInstance->Modules->GetAllModuleNames(filter);
  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(MyModules(VF_COMMON));
  46         irc::commasepstream optmodulelist(MyModules(VF_OPTCOMMON));
  47         this->WriteLine("CAPAB START");
  48
  49         /* Send module names, split at 509 length */
  50         std::string item;
  51         std::string line = "CAPAB MODULES ";
  52         while (modulelist.GetToken(item))
  53         {
  54                 if (line.length() + item.length() + 1 > 509)
  55                 {
  56                         this->WriteLine(line);
  57                         line = "CAPAB MODULES ";
  58                 }
  59
  60                 if (line != "CAPAB MODULES ")
  61                         line.append(",");
  62
  63                 line.append(item);
  64         }
  65         if (line != "CAPAB MODULES ")
  66                 this->WriteLine(line);
  67
  68         line = "CAPAB MODSUPPORT ";
  69         while (optmodulelist.GetToken(item))
  70         {
  71                 if (line.length() + item.length() + 1 > 509)
  72                 {
  73                         this->WriteLine(line);
  74                         line = "CAPAB MODSUPPORT ";
  75                 }
  76
  77                 if (line != "CAPAB MODSUPPORT ")
  78                         line.append(",");
  79
  80                 line.append(item);
  81         }
  82         if (line != "CAPAB MODSUPPORT ")
  83                 this->WriteLine(line);
  84
  85
  86         int ip6 = 0;
  87 #ifdef IPV6
  88         ip6 = 1;
  89 #endif
  90         std::string extra;
  91         /* Do we have sha256 available? If so, we send a challenge */
  92         if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
  93         {
  94                 this->SetOurChallenge(RandString(20));
  95                 extra = " CHALLENGE=" + this->GetOurChallenge();
  96         }
  97
  98         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
  99                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
 100                         " HALFOP="+ConvToStr(ServerInstance->Config->AllowHalfop)+
 101                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
 102                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
 103                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
 104                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
 105                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
 106                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
 107                         " MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
 108                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
 109                         " IP6NATIVE="+ConvToStr(ip6)+
 110                         " IP6SUPPORT=1"+
 111                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
 112                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 113                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
 114                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
 115                         " SVSPART=1");
 116
 117         this->WriteLine("CAPAB END");
 118 }
 119
 120 /* Check a comma seperated list for an item */
 121 bool TreeSocket::HasItem(const std::string &list, const std::string &item)
 122 {
 123         irc::commasepstream seplist(list);
 124         std::string item2;
 125
 126         while (seplist.GetToken(item2))
 127         {
 128                 if (item2 == item)
 129                         return true;
 130         }
 131         return false;
 132 }
 133
 134 /* Isolate and return the elements that are different between two comma seperated lists */
 135 std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
 136 {
 137         irc::commasepstream list_one(one);
 138         std::string item;
 139         std::string result;
 140         while (list_one.GetToken(item))
 141         {
 142                 if (!HasItem(two, item))
 143                 {
 144                         result.append(" ");
 145                         result.append(item);
 146                 }
 147         }
 148         return result;
 149 }
 150
 151 bool TreeSocket::Capab(const parameterlist &params)
 152 {
 153         if (params.size() < 1)
 154         {
 155                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 156                 return false;
 157         }
 158         if (params[0] == "START")
 159         {
 160                 ModuleList.clear();
 161                 OptModuleList.clear();
 162                 CapKeys.clear();
 163         }
 164         else if (params[0] == "END")
 165         {
 166                 std::string reason;
 167                 /* Compare ModuleList and check CapKeys */
 168                 if ((this->ModuleList != this->MyModules(VF_COMMON)) && (this->ModuleList.length()))
 169                 {
 170                         std::string diffIneed = ListDifference(this->ModuleList, this->MyModules(VF_COMMON));
 171                         std::string diffUneed = ListDifference(this->MyModules(VF_COMMON), this->ModuleList);
 172                         if (diffIneed.length() == 0 && diffUneed.length() == 0)
 173                         {
 174                                 reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 175                         }
 176                         else
 177                         {
 178                                 reason = "Modules incorrectly matched on these servers.";
 179                                 if (diffIneed.length())
 180                                         reason += " Not loaded here:" + diffIneed;
 181                                 if (diffUneed.length())
 182                                         reason += " Not loaded there:" + diffUneed;
 183                         }
 184                         this->SendError("CAPAB negotiation failed: "+reason);
 185                         return false;
 186                 }
 187                 if (this->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->OptModuleList.length())
 188                 {
 189                         std::string diffIneed = ListDifference(this->OptModuleList, this->MyModules(VF_OPTCOMMON));
 190                         std::string diffUneed = ListDifference(this->MyModules(VF_OPTCOMMON), this->OptModuleList);
 191                         if (diffIneed.length() == 0 && diffUneed.length() == 0)
 192                         {
 193                                 reason = "Optional Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 194                         }
 195                         else
 196                         {
 197                                 ServerInstance->SNO->WriteToSnoMask('l',
 198                                         "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 199                                         diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 200                                         diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 201                         }
 202                 }
 203
 204                 if (this->CapKeys.find("PROTOCOL") == this->CapKeys.end())
 205                 {
 206                         reason = "Protocol version not specified";
 207                 }
 208                 else
 209                 {
 210                         int otherProto = atoi(CapKeys.find("PROTOCOL")->second.c_str());
 211                         if (otherProto < MinCompatProtocol)
 212                         {
 213                                 reason = "Server is using protocol version " + ConvToStr(otherProto) +
 214                                         " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 215                                         + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
 216                         }
 217                 }
 218
 219                 if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != this->ServerInstance->Modes->BuildPrefixes())
 220                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 221
 222                 if(this->CapKeys.find("CHANMODES") != this->CapKeys.end() && this->CapKeys.find("CHANMODES")->second != this->ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
 223                         reason = "One or more of the channel modes on the remote server are invalid on this server.";
 224
 225                 if(this->CapKeys.find("USERMODES") != this->CapKeys.end() && this->CapKeys.find("USERMODES")->second != this->ServerInstance->Modes->GiveModeList(MASK_USER))
 226                         reason = "One or more of the user modes on the remote server are invalid on this server.";
 227
 228
 229                 /* Challenge response, store their challenge for our password */
 230                 std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE");
 231                 if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
 232                 {
 233                         /* Challenge-response is on now */
 234                         this->SetTheirChallenge(n->second);
 235                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 236                         {
 237                                 this->SendCapabilities();
 238                                 this->WriteLine(std::string("SERVER ")+this->ServerInstance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 "+
 239                                                 ServerInstance->Config->GetSID()+" :"+this->ServerInstance->Config->ServerDesc);
 240                         }
 241                 }
 242                 else
 243                 {
 244                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 245                         if (this->LinkState == CONNECTING)
 246                         {
 247                                 this->SendCapabilities();
 248                                 this->WriteLine(std::string("SERVER ")+this->ServerInstance->Config->ServerName+" "+OutboundPass+" 0 "+ServerInstance->Config->GetSID()+" :"+this->ServerInstance->Config->ServerDesc);
 249                         }
 250                 }
 251
 252                 if (reason.length())
 253                 {
 254                         this->SendError("CAPAB negotiation failed: "+reason);
 255                         return false;
 256                 }
 257         }
 258         else if ((params[0] == "MODULES") && (params.size() == 2))
 259         {
 260                 if (!this->ModuleList.length())
 261                 {
 262                         this->ModuleList.append(params[1]);
 263                 }
 264                 else
 265                 {
 266                         this->ModuleList.append(",");
 267                         this->ModuleList.append(params[1]);
 268                 }
 269         }
 270         else if ((params[0] == "MODSUPPORT") && (params.size() == 2))
 271         {
 272                 if (!this->OptModuleList.length())
 273                 {
 274                         this->OptModuleList.append(params[1]);
 275                 }
 276                 else
 277                 {
 278                         this->OptModuleList.append(",");
 279                         this->OptModuleList.append(params[1]);
 280                 }
 281         }
 282         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 283         {
 284                 irc::tokenstream capabs(params[1]);
 285                 std::string item;
 286                 bool more = true;
 287                 while ((more = capabs.GetToken(item)))
 288                 {
 289                         /* Process each key/value pair */
 290                         std::string::size_type equals = item.rfind('=');
 291                         if (equals != std::string::npos)
 292                         {
 293                                 std::string var = item.substr(0, equals);
 294                                 std::string value = item.substr(equals+1, item.length());
 295                                 CapKeys[var] = value;
 296                         }
 297                 }
 298         }
 299         return true;
 300 }
 301