src/modules/m_spanningtree/capab.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
   7  *
   8  * This file is part of InspIRCd.  InspIRCd is free software: you can
   9  * redistribute it and/or modify it under the terms of the GNU General Public
  10  * License as published by the Free Software Foundation, version 2.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  14  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  15  * details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21
  22 #include "inspircd.h"
  23
  24 #include "treeserver.h"
  25 #include "utils.h"
  26 #include "link.h"
  27 #include "main.h"
  28
  29 std::string TreeSocket::MyModules(int filter)
  30 {
  31         std::vector<std::string> modlist = ServerInstance->Modules->GetAllModuleNames(filter);
  32
  33         std::string capabilities;
  34         sort(modlist.begin(),modlist.end());
  35         for (std::vector<std::string>::const_iterator i = modlist.begin(); i != modlist.end(); ++i)
  36         {
  37                 if (i != modlist.begin())
  38                         capabilities.push_back(' ');
  39                 capabilities.append(*i);
  40                 Module* m = ServerInstance->Modules->Find(*i);
  41                 Version v = m->GetVersion();
  42                 if (!v.link_data.empty())
  43                 {
  44                         capabilities.push_back('=');
  45                         capabilities.append(v.link_data);
  46                 }
  47         }
  48         return capabilities;
  49 }
  50
  51 static std::string BuildModeList(ModeType type)
  52 {
  53         std::vector<std::string> modes;
  54         for(char c='A'; c <= 'z'; c++)
  55         {
  56                 ModeHandler* mh = ServerInstance->Modes->FindMode(c, type);
  57                 if (mh)
  58                 {
  59                         std::string mdesc = mh->name;
  60                         mdesc.push_back('=');
  61                         if (mh->GetPrefix())
  62                                 mdesc.push_back(mh->GetPrefix());
  63                         if (mh->GetModeChar())
  64                                 mdesc.push_back(mh->GetModeChar());
  65                         modes.push_back(mdesc);
  66                 }
  67         }
  68         sort(modes.begin(), modes.end());
  69         irc::stringjoiner line(" ", modes, 0, modes.size() - 1);
  70         return line.GetJoined();
  71 }
  72
  73 void TreeSocket::SendCapabilities(int phase)
  74 {
  75         if (capab->capab_phase >= phase)
  76                 return;
  77
  78         if (capab->capab_phase < 1 && phase >= 1)
  79                 WriteLine("CAPAB START " + ConvToStr(ProtocolVersion));
  80
  81         capab->capab_phase = phase;
  82         if (phase < 2)
  83                 return;
  84
  85         const char sep = ' ';
  86         irc::sepstream modulelist(MyModules(VF_COMMON), sep);
  87         irc::sepstream optmodulelist(MyModules(VF_OPTCOMMON), sep);
  88         /* Send module names, split at 509 length */
  89         std::string item;
  90         std::string line = "CAPAB MODULES :";
  91         while (modulelist.GetToken(item))
  92         {
  93                 if (line.length() + item.length() + 1 > 509)
  94                 {
  95                         this->WriteLine(line);
  96                         line = "CAPAB MODULES :";
  97                 }
  98
  99                 if (line != "CAPAB MODULES :")
 100                         line.push_back(sep);
 101
 102                 line.append(item);
 103         }
 104         if (line != "CAPAB MODULES :")
 105                 this->WriteLine(line);
 106
 107         line = "CAPAB MODSUPPORT :";
 108         while (optmodulelist.GetToken(item))
 109         {
 110                 if (line.length() + item.length() + 1 > 509)
 111                 {
 112                         this->WriteLine(line);
 113                         line = "CAPAB MODSUPPORT :";
 114                 }
 115
 116                 if (line != "CAPAB MODSUPPORT :")
 117                         line.push_back(sep);
 118
 119                 line.append(item);
 120         }
 121         if (line != "CAPAB MODSUPPORT :")
 122                 this->WriteLine(line);
 123
 124         WriteLine("CAPAB CHANMODES :" + BuildModeList(MODETYPE_CHANNEL));
 125         WriteLine("CAPAB USERMODES :" + BuildModeList(MODETYPE_USER));
 126
 127         std::string extra;
 128         /* Do we have sha256 available? If so, we send a challenge */
 129         if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
 130         {
 131                 SetOurChallenge(ServerInstance->GenRandomStr(20));
 132                 extra = " CHALLENGE=" + this->GetOurChallenge();
 133         }
 134
 135         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
 136                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
 137                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
 138                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
 139                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
 140                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
 141                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
 142                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
 143                         " MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
 144                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
 145                         " IP6SUPPORT=1"+
 146                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
 147                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 148                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
 149                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
 150                         " SVSPART=1");
 151
 152         this->WriteLine("CAPAB END");
 153 }
 154
 155 /* Isolate and return the elements that are different between two comma seperated lists */
 156 void TreeSocket::ListDifference(const std::string &one, const std::string &two, char sep,
 157                 std::string& mleft, std::string& mright)
 158 {
 159         std::set<std::string> values;
 160         irc::sepstream sepleft(one, sep);
 161         irc::sepstream sepright(two, sep);
 162         std::string item;
 163         while (sepleft.GetToken(item))
 164         {
 165                 values.insert(item);
 166         }
 167         while (sepright.GetToken(item))
 168         {
 169                 if (!values.erase(item))
 170                 {
 171                         mright.push_back(sep);
 172                         mright.append(item);
 173                 }
 174         }
 175         for(std::set<std::string>::iterator i = values.begin(); i != values.end(); ++i)
 176         {
 177                 mleft.push_back(sep);
 178                 mleft.append(*i);
 179         }
 180 }
 181
 182 bool TreeSocket::Capab(const parameterlist &params)
 183 {
 184         if (params.size() < 1)
 185         {
 186                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 187                 return false;
 188         }
 189         if (params[0] == "START")
 190         {
 191                 capab->ModuleList.clear();
 192                 capab->OptModuleList.clear();
 193                 capab->CapKeys.clear();
 194                 if (params.size() > 1)
 195                         proto_version = ConvToInt(params[1]);
 196                 SendCapabilities(2);
 197         }
 198         else if (params[0] == "END")
 199         {
 200                 std::string reason;
 201                 /* Compare ModuleList and check CapKeys */
 202                 if ((this->capab->ModuleList != this->MyModules(VF_COMMON)) && (this->capab->ModuleList.length()))
 203                 {
 204                         std::string diffIneed, diffUneed;
 205                         ListDifference(this->capab->ModuleList, this->MyModules(VF_COMMON), ' ', diffIneed, diffUneed);
 206                         if (diffIneed.length() || diffUneed.length())
 207                         {
 208                                 reason = "Modules incorrectly matched on these servers.";
 209                                 if (diffIneed.length())
 210                                         reason += " Not loaded here:" + diffIneed;
 211                                 if (diffUneed.length())
 212                                         reason += " Not loaded there:" + diffUneed;
 213                                 this->SendError("CAPAB negotiation failed: "+reason);
 214                                 return false;
 215                         }
 216                 }
 217                 if (this->capab->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->capab->OptModuleList.length())
 218                 {
 219                         std::string diffIneed, diffUneed;
 220                         ListDifference(this->capab->OptModuleList, this->MyModules(VF_OPTCOMMON), ' ', diffIneed, diffUneed);
 221                         if (diffIneed.length() || diffUneed.length())
 222                         {
 223                                 if (Utils->AllowOptCommon)
 224                                 {
 225                                         ServerInstance->SNO->WriteToSnoMask('l',
 226                                                 "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 227                                                 diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 228                                                 diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 229                                 }
 230                                 else
 231                                 {
 232                                         reason = "Optional modules incorrectly matched on these servers, and options::allowmismatch not set.";
 233                                         if (diffIneed.length())
 234                                                 reason += " Not loaded here:" + diffIneed;
 235                                         if (diffUneed.length())
 236                                                 reason += " Not loaded there:" + diffUneed;
 237                                         this->SendError("CAPAB negotiation failed: "+reason);
 238                                         return false;
 239                                 }
 240                         }
 241                 }
 242
 243                 if (this->capab->CapKeys.find("PROTOCOL") == this->capab->CapKeys.end())
 244                 {
 245                         reason = "Protocol version not specified";
 246                 }
 247                 else
 248                 {
 249                         proto_version = ConvToInt(capab->CapKeys.find("PROTOCOL")->second);
 250                         if (proto_version < MinCompatProtocol)
 251                         {
 252                                 reason = "Server is using protocol version " + ConvToStr(proto_version) +
 253                                         " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 254                                         + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
 255                         }
 256                 }
 257
 258                 if(this->capab->CapKeys.find("PREFIX") != this->capab->CapKeys.end() && this->capab->CapKeys.find("PREFIX")->second != ServerInstance->Modes->BuildPrefixes())
 259                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 260
 261                 if (!capab->ChanModes.empty())
 262                 {
 263                         if (capab->ChanModes != BuildModeList(MODETYPE_CHANNEL))
 264                         {
 265                                 std::string diffIneed, diffUneed;
 266                                 ListDifference(capab->ChanModes, BuildModeList(MODETYPE_CHANNEL), ' ', diffIneed, diffUneed);
 267                                 if (diffIneed.length() || diffUneed.length())
 268                                 {
 269                                         reason = "Channel modes not matched on these servers.";
 270                                         if (diffIneed.length())
 271                                                 reason += " Not loaded here:" + diffIneed;
 272                                         if (diffUneed.length())
 273                                                 reason += " Not loaded there:" + diffUneed;
 274                                 }
 275                         }
 276                 }
 277                 else if (this->capab->CapKeys.find("CHANMODES") != this->capab->CapKeys.end())
 278                 {
 279                         if (this->capab->CapKeys.find("CHANMODES")->second != ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
 280                                 reason = "One or more of the channel modes on the remote server are invalid on this server.";
 281                 }
 282
 283                 if (!capab->UserModes.empty())
 284                 {
 285                         if (capab->UserModes != BuildModeList(MODETYPE_USER))
 286                         {
 287                                 std::string diffIneed, diffUneed;
 288                                 ListDifference(capab->UserModes, BuildModeList(MODETYPE_USER), ' ', diffIneed, diffUneed);
 289                                 if (diffIneed.length() || diffUneed.length())
 290                                 {
 291                                         reason = "User modes not matched on these servers.";
 292                                         if (diffIneed.length())
 293                                                 reason += " Not loaded here:" + diffIneed;
 294                                         if (diffUneed.length())
 295                                                 reason += " Not loaded there:" + diffUneed;
 296                                 }
 297                         }
 298                 }
 299                 else if (this->capab->CapKeys.find("USERMODES") != this->capab->CapKeys.end())
 300                 {
 301                         if (this->capab->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MASK_USER))
 302                                 reason = "One or more of the user modes on the remote server are invalid on this server.";
 303                 }
 304
 305                 /* Challenge response, store their challenge for our password */
 306                 std::map<std::string,std::string>::iterator n = this->capab->CapKeys.find("CHALLENGE");
 307                 if (Utils->ChallengeResponse && (n != this->capab->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
 308                 {
 309                         /* Challenge-response is on now */
 310                         this->SetTheirChallenge(n->second);
 311                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 312                         {
 313                                 this->SendCapabilities(2);
 314                                 this->WriteLine("SERVER "+ServerInstance->Config->ServerName+" "+this->MakePass(capab->link->SendPass, capab->theirchallenge)+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 315                         }
 316                 }
 317                 else
 318                 {
 319                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 320                         if (this->LinkState == CONNECTING)
 321                         {
 322                                 this->SendCapabilities(2);
 323                                 this->WriteLine("SERVER "+ServerInstance->Config->ServerName+" "+capab->link->SendPass+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 324                         }
 325                 }
 326
 327                 if (reason.length())
 328                 {
 329                         this->SendError("CAPAB negotiation failed: "+reason);
 330                         return false;
 331                 }
 332         }
 333         else if ((params[0] == "MODULES") && (params.size() == 2))
 334         {
 335                 if (!capab->ModuleList.length())
 336                 {
 337                         capab->ModuleList = params[1];
 338                 }
 339                 else
 340                 {
 341                         capab->ModuleList.push_back(' ');
 342                         capab->ModuleList.append(params[1]);
 343                 }
 344         }
 345         else if ((params[0] == "MODSUPPORT") && (params.size() == 2))
 346         {
 347                 if (!capab->OptModuleList.length())
 348                 {
 349                         capab->OptModuleList = params[1];
 350                 }
 351                 else
 352                 {
 353                         capab->OptModuleList.push_back(' ');
 354                         capab->OptModuleList.append(params[1]);
 355                 }
 356         }
 357         else if ((params[0] == "CHANMODES") && (params.size() == 2))
 358         {
 359                 capab->ChanModes = params[1];
 360         }
 361         else if ((params[0] == "USERMODES") && (params.size() == 2))
 362         {
 363                 capab->UserModes = params[1];
 364         }
 365         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 366         {
 367                 irc::tokenstream capabs(params[1]);
 368                 std::string item;
 369                 while (capabs.GetToken(item))
 370                 {
 371                         /* Process each key/value pair */
 372                         std::string::size_type equals = item.find('=');
 373                         if (equals != std::string::npos)
 374                         {
 375                                 std::string var = item.substr(0, equals);
 376                                 std::string value = item.substr(equals+1, item.length());
 377                                 capab->CapKeys[var] = value;
 378                         }
 379                 }
 380         }
 381         return true;
 382 }
 383