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 std::string TreeSocket::MyModules(int filter)
  25 {
  26         std::vector<std::string> modlist = ServerInstance->Modules->GetAllModuleNames(filter);
  27
  28         if (filter == VF_COMMON && proto_version != ProtocolVersion)
  29                 CompatAddModules(modlist);
  30
  31         std::string capabilities;
  32         sort(modlist.begin(),modlist.end());
  33         for (unsigned int i = 0; i < modlist.size(); i++)
  34         {
  35                 if (i)
  36                         capabilities = capabilities + ",";
  37                 capabilities = capabilities + modlist[i];
  38         }
  39         return capabilities;
  40 }
  41
  42 void TreeSocket::SendCapabilities(int phase)
  43 {
  44         if (capab_phase >= phase)
  45                 return;
  46
  47         if (capab_phase < 1 && phase >= 1)
  48                 WriteLine("CAPAB START " + ConvToStr(ProtocolVersion));
  49
  50         capab_phase = phase;
  51         if (phase < 2)
  52                 return;
  53
  54         irc::commasepstream modulelist(MyModules(VF_COMMON));
  55         irc::commasepstream optmodulelist(MyModules(VF_OPTCOMMON));
  56         /* Send module names, split at 509 length */
  57         std::string item;
  58         std::string line = "CAPAB MODULES ";
  59         while (modulelist.GetToken(item))
  60         {
  61                 if (line.length() + item.length() + 1 > 509)
  62                 {
  63                         this->WriteLine(line);
  64                         line = "CAPAB MODULES ";
  65                 }
  66
  67                 if (line != "CAPAB MODULES ")
  68                         line.append(",");
  69
  70                 line.append(item);
  71         }
  72         if (line != "CAPAB MODULES ")
  73                 this->WriteLine(line);
  74
  75         line = "CAPAB MODSUPPORT ";
  76         while (optmodulelist.GetToken(item))
  77         {
  78                 if (line.length() + item.length() + 1 > 509)
  79                 {
  80                         this->WriteLine(line);
  81                         line = "CAPAB MODSUPPORT ";
  82                 }
  83
  84                 if (line != "CAPAB MODSUPPORT ")
  85                         line.append(",");
  86
  87                 line.append(item);
  88         }
  89         if (line != "CAPAB MODSUPPORT ")
  90                 this->WriteLine(line);
  91
  92
  93         int ip6 = 0;
  94 #ifdef IPV6
  95         ip6 = 1;
  96 #endif
  97         std::string extra;
  98         /* Do we have sha256 available? If so, we send a challenge */
  99         if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
 100         {
 101                 this->SetOurChallenge(RandString(20));
 102                 extra = " CHALLENGE=" + this->GetOurChallenge();
 103         }
 104
 105         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
 106                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
 107                         " HALFOP="+ConvToStr(ServerInstance->Config->AllowHalfop)+
 108                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
 109                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
 110                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
 111                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
 112                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
 113                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
 114                         " MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
 115                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
 116                         " IP6NATIVE="+ConvToStr(ip6)+
 117                         " IP6SUPPORT=1"+
 118                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
 119                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 120                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
 121                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
 122                         " SVSPART=1");
 123
 124         this->WriteLine("CAPAB END");
 125 }
 126
 127 /* Check a comma seperated list for an item */
 128 bool TreeSocket::HasItem(const std::string &list, const std::string &item)
 129 {
 130         irc::commasepstream seplist(list);
 131         std::string item2;
 132
 133         while (seplist.GetToken(item2))
 134         {
 135                 if (item2 == item)
 136                         return true;
 137         }
 138         return false;
 139 }
 140
 141 /* Isolate and return the elements that are different between two comma seperated lists */
 142 std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
 143 {
 144         irc::commasepstream list_one(one);
 145         std::string item;
 146         std::string result;
 147         while (list_one.GetToken(item))
 148         {
 149                 if (!HasItem(two, item))
 150                 {
 151                         result.append(" ");
 152                         result.append(item);
 153                 }
 154         }
 155         return result;
 156 }
 157
 158 bool TreeSocket::Capab(const parameterlist &params)
 159 {
 160         if (params.size() < 1)
 161         {
 162                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 163                 return false;
 164         }
 165         if (params[0] == "START")
 166         {
 167                 ModuleList.clear();
 168                 OptModuleList.clear();
 169                 CapKeys.clear();
 170                 if (params.size() > 1)
 171                         proto_version = atoi(params[1].c_str());
 172                 SendCapabilities(2);
 173         }
 174         else if (params[0] == "END")
 175         {
 176                 std::string reason;
 177                 /* Compare ModuleList and check CapKeys */
 178                 if ((this->ModuleList != this->MyModules(VF_COMMON)) && (this->ModuleList.length()))
 179                 {
 180                         std::string diffIneed = ListDifference(this->ModuleList, this->MyModules(VF_COMMON));
 181                         std::string diffUneed = ListDifference(this->MyModules(VF_COMMON), this->ModuleList);
 182                         if (diffIneed.length() == 0 && diffUneed.length() == 0)
 183                         {
 184                                 reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 185                         }
 186                         else
 187                         {
 188                                 reason = "Modules incorrectly matched on these servers.";
 189                                 if (diffIneed.length())
 190                                         reason += " Not loaded here:" + diffIneed;
 191                                 if (diffUneed.length())
 192                                         reason += " Not loaded there:" + diffUneed;
 193                         }
 194                         this->SendError("CAPAB negotiation failed: "+reason);
 195                         return false;
 196                 }
 197                 if (this->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->OptModuleList.length())
 198                 {
 199                         std::string diffIneed = ListDifference(this->OptModuleList, this->MyModules(VF_OPTCOMMON));
 200                         std::string diffUneed = ListDifference(this->MyModules(VF_OPTCOMMON), this->OptModuleList);
 201                         if (diffIneed.length() == 0 && diffUneed.length() == 0)
 202                         {
 203                                 reason = "Optional Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 204                         }
 205                         else if (Utils->AllowOptCommon)
 206                         {
 207                                 ServerInstance->SNO->WriteToSnoMask('l',
 208                                         "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 209                                         diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 210                                         diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 211                         }
 212                         else
 213                         {
 214                                 reason = "Optional modules incorrectly matched on these servers, and options::allowmismatch not set.";
 215                                 if (diffIneed.length())
 216                                         reason += " Not loaded here:" + diffIneed;
 217                                 if (diffUneed.length())
 218                                         reason += " Not loaded there:" + diffUneed;
 219                                 this->SendError("CAPAB negotiation failed: "+reason);
 220                                 return false;
 221                         }
 222                 }
 223
 224                 if (this->CapKeys.find("PROTOCOL") == this->CapKeys.end())
 225                 {
 226                         reason = "Protocol version not specified";
 227                 }
 228                 else
 229                 {
 230                         proto_version = atoi(CapKeys.find("PROTOCOL")->second.c_str());
 231                         if (proto_version < MinCompatProtocol)
 232                         {
 233                                 reason = "Server is using protocol version " + ConvToStr(proto_version) +
 234                                         " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 235                                         + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
 236                         }
 237                 }
 238
 239                 if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != ServerInstance->Modes->BuildPrefixes())
 240                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 241
 242                 if(this->CapKeys.find("CHANMODES") != this->CapKeys.end() && this->CapKeys.find("CHANMODES")->second != ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
 243                         reason = "One or more of the channel modes on the remote server are invalid on this server.";
 244
 245                 if(this->CapKeys.find("USERMODES") != this->CapKeys.end() && this->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MASK_USER))
 246                         reason = "One or more of the user modes on the remote server are invalid on this server.";
 247
 248
 249                 /* Challenge response, store their challenge for our password */
 250                 std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE");
 251                 if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
 252                 {
 253                         /* Challenge-response is on now */
 254                         this->SetTheirChallenge(n->second);
 255                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 256                         {
 257                                 this->SendCapabilities(2);
 258                                 this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 "+
 259                                                 ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 260                         }
 261                 }
 262                 else
 263                 {
 264                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 265                         if (this->LinkState == CONNECTING)
 266                         {
 267                                 this->SendCapabilities(2);
 268                                 this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+OutboundPass+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 269                         }
 270                 }
 271
 272                 if (reason.length())
 273                 {
 274                         this->SendError("CAPAB negotiation failed: "+reason);
 275                         return false;
 276                 }
 277         }
 278         else if ((params[0] == "MODULES") && (params.size() == 2))
 279         {
 280                 if (!this->ModuleList.length())
 281                 {
 282                         this->ModuleList.append(params[1]);
 283                 }
 284                 else
 285                 {
 286                         this->ModuleList.append(",");
 287                         this->ModuleList.append(params[1]);
 288                 }
 289         }
 290         else if ((params[0] == "MODSUPPORT") && (params.size() == 2))
 291         {
 292                 if (!this->OptModuleList.length())
 293                 {
 294                         this->OptModuleList.append(params[1]);
 295                 }
 296                 else
 297                 {
 298                         this->OptModuleList.append(",");
 299                         this->OptModuleList.append(params[1]);
 300                 }
 301         }
 302         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 303         {
 304                 irc::tokenstream capabs(params[1]);
 305                 std::string item;
 306                 bool more = true;
 307                 while ((more = capabs.GetToken(item)))
 308                 {
 309                         /* Process each key/value pair */
 310                         std::string::size_type equals = item.rfind('=');
 311                         if (equals != std::string::npos)
 312                         {
 313                                 std::string var = item.substr(0, equals);
 314                                 std::string value = item.substr(equals+1, item.length());
 315                                 CapKeys[var] = value;
 316                         }
 317                 }
 318         }
 319         return true;
 320 }
 321