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 struct CompatMod
  30 {
  31         const char* name;
  32         ModuleFlags listflag;
  33 };
  34
  35 static CompatMod compatmods[] =
  36 {
  37         { "m_watch.so", VF_OPTCOMMON }
  38 };
  39
  40 std::string TreeSocket::MyModules(int filter)
  41 {
  42         const ModuleManager::ModuleMap& modlist = ServerInstance->Modules->GetModules();
  43
  44         std::string capabilities;
  45         for (ModuleManager::ModuleMap::const_iterator i = modlist.begin(); i != modlist.end(); ++i)
  46         {
  47                 Module* const mod = i->second;
  48                 // 3.0 advertises its settings for the benefit of services
  49                 // 2.0 would bork on this
  50                 if (proto_version < 1205 && i->second->ModuleSourceFile == "m_kicknorejoin.so")
  51                         continue;
  52
  53                 bool do_compat_include = false;
  54                 if (proto_version < 1205)
  55                 {
  56                         for (size_t j = 0; j < sizeof(compatmods)/sizeof(compatmods[0]); j++)
  57                         {
  58                                 if ((compatmods[j].listflag & filter) && (mod->ModuleSourceFile == compatmods[j].name))
  59                                 {
  60                                         do_compat_include = true;
  61                                         break;
  62                                 }
  63                         }
  64                 }
  65
  66                 Version v = i->second->GetVersion();
  67                 if ((!do_compat_include) && (!(v.Flags & filter)))
  68                         continue;
  69
  70                 if (i != modlist.begin())
  71                         capabilities.push_back(' ');
  72                 capabilities.append(i->first);
  73                 if (!v.link_data.empty())
  74                 {
  75                         capabilities.push_back('=');
  76                         capabilities.append(v.link_data);
  77                 }
  78         }
  79         return capabilities;
  80 }
  81
  82 static std::string BuildModeList(ModeType type)
  83 {
  84         std::vector<std::string> modes;
  85         const ModeParser::ModeHandlerMap& mhs = ServerInstance->Modes.GetModes(type);
  86         for (ModeParser::ModeHandlerMap::const_iterator i = mhs.begin(); i != mhs.end(); ++i)
  87         {
  88                 const ModeHandler* const mh = i->second;
  89                 std::string mdesc = mh->name;
  90                 mdesc.push_back('=');
  91                 const PrefixMode* const pm = mh->IsPrefixMode();
  92                 if (pm)
  93                 {
  94                         if (pm->GetPrefix())
  95                                 mdesc.push_back(pm->GetPrefix());
  96                 }
  97                 mdesc.push_back(mh->GetModeChar());
  98                 modes.push_back(mdesc);
  99         }
 100         std::sort(modes.begin(), modes.end());
 101         return stdalgo::string::join(modes);
 102 }
 103
 104 void TreeSocket::SendCapabilities(int phase)
 105 {
 106         if (capab->capab_phase >= phase)
 107                 return;
 108
 109         if (capab->capab_phase < 1 && phase >= 1)
 110                 WriteLine("CAPAB START " + ConvToStr(ProtocolVersion));
 111
 112         capab->capab_phase = phase;
 113         if (phase < 2)
 114                 return;
 115
 116         const char sep = ' ';
 117         irc::sepstream modulelist(MyModules(VF_COMMON), sep);
 118         irc::sepstream optmodulelist(MyModules(VF_OPTCOMMON), sep);
 119         /* Send module names, split at 509 length */
 120         std::string item;
 121         std::string line = "CAPAB MODULES :";
 122         while (modulelist.GetToken(item))
 123         {
 124                 if (line.length() + item.length() + 1 > 509)
 125                 {
 126                         this->WriteLine(line);
 127                         line = "CAPAB MODULES :";
 128                 }
 129
 130                 if (line != "CAPAB MODULES :")
 131                         line.push_back(sep);
 132
 133                 line.append(item);
 134         }
 135         if (line != "CAPAB MODULES :")
 136                 this->WriteLine(line);
 137
 138         line = "CAPAB MODSUPPORT :";
 139         while (optmodulelist.GetToken(item))
 140         {
 141                 if (line.length() + item.length() + 1 > 509)
 142                 {
 143                         this->WriteLine(line);
 144                         line = "CAPAB MODSUPPORT :";
 145                 }
 146
 147                 if (line != "CAPAB MODSUPPORT :")
 148                         line.push_back(sep);
 149
 150                 line.append(item);
 151         }
 152         if (line != "CAPAB MODSUPPORT :")
 153                 this->WriteLine(line);
 154
 155         WriteLine("CAPAB CHANMODES :" + BuildModeList(MODETYPE_CHANNEL));
 156         WriteLine("CAPAB USERMODES :" + BuildModeList(MODETYPE_USER));
 157
 158         std::string extra;
 159         /* Do we have sha256 available? If so, we send a challenge */
 160         if (ServerInstance->Modules->FindService(SERVICE_DATA, "hash/sha256"))
 161         {
 162                 SetOurChallenge(ServerInstance->GenRandomStr(20));
 163                 extra = " CHALLENGE=" + this->GetOurChallenge();
 164         }
 165
 166         // 2.0 needs this key
 167         if (proto_version == 1202)
 168                 extra.append(" PROTOCOL="+ConvToStr(ProtocolVersion));
 169
 170         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
 171                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
 172                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
 173                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
 174                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
 175                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
 176                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
 177                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
 178                         " MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
 179                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
 180                         " MAXHOST="+ConvToStr(ServerInstance->Config->Limits.MaxHost)+
 181                         extra+
 182                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 183                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MODETYPE_CHANNEL)+
 184                         " USERMODES="+ServerInstance->Modes->GiveModeList(MODETYPE_USER)+
 185                         " CASEMAPPING="+ServerInstance->Config->CaseMapping+
 186                         // XXX: Advertise the presence or absence of m_globops in CAPAB CAPABILITIES.
 187                         // Services want to know about it, and since m_globops was not marked as VF_(OPT)COMMON
 188                         // in 2.0, we advertise it here to not break linking to previous versions.
 189                         // Protocol version 1201 (1.2) does not have this issue because we advertise m_globops
 190                         // to 1201 protocol servers irrespectively of its module flags.
 191                         (ServerInstance->Modules->Find("m_globops.so") != NULL ? " GLOBOPS=1" : " GLOBOPS=0")
 192                         );
 193
 194         this->WriteLine("CAPAB END");
 195 }
 196
 197 /* Isolate and return the elements that are different between two comma seperated lists */
 198 void TreeSocket::ListDifference(const std::string &one, const std::string &two, char sep,
 199                 std::string& mleft, std::string& mright)
 200 {
 201         std::set<std::string> values;
 202         irc::sepstream sepleft(one, sep);
 203         irc::sepstream sepright(two, sep);
 204         std::string item;
 205         while (sepleft.GetToken(item))
 206         {
 207                 values.insert(item);
 208         }
 209         while (sepright.GetToken(item))
 210         {
 211                 if (!values.erase(item))
 212                 {
 213                         mright.push_back(sep);
 214                         mright.append(item);
 215                 }
 216         }
 217         for(std::set<std::string>::iterator i = values.begin(); i != values.end(); ++i)
 218         {
 219                 mleft.push_back(sep);
 220                 mleft.append(*i);
 221         }
 222 }
 223
 224 bool TreeSocket::Capab(const CommandBase::Params& params)
 225 {
 226         if (params.size() < 1)
 227         {
 228                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 229                 return false;
 230         }
 231         if (params[0] == "START")
 232         {
 233                 capab->ModuleList.clear();
 234                 capab->OptModuleList.clear();
 235                 capab->CapKeys.clear();
 236                 if (params.size() > 1)
 237                         proto_version = ConvToInt(params[1]);
 238
 239                 if (proto_version < MinCompatProtocol)
 240                 {
 241                         SendError("CAPAB negotiation failed: Server is using protocol version " + (proto_version ? ConvToStr(proto_version) : "1201 or older")
 242                                 + " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 243                                 + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")"));
 244                         return false;
 245                 }
 246
 247                 // Special case, may be removed in the future
 248                 if (proto_version == 1203 || proto_version == 1204)
 249                 {
 250                         SendError("CAPAB negotiation failed: InspIRCd 2.1 beta is not supported");
 251                         return false;
 252                 }
 253
 254                 SendCapabilities(2);
 255         }
 256         else if (params[0] == "END")
 257         {
 258                 std::string reason;
 259                 /* Compare ModuleList and check CapKeys */
 260                 if ((this->capab->ModuleList != this->MyModules(VF_COMMON)) && (this->capab->ModuleList.length()))
 261                 {
 262                         std::string diffIneed, diffUneed;
 263                         ListDifference(this->capab->ModuleList, this->MyModules(VF_COMMON), ' ', diffIneed, diffUneed);
 264                         if (diffIneed.length() || diffUneed.length())
 265                         {
 266                                 reason = "Modules incorrectly matched on these servers.";
 267                                 if (diffIneed.length())
 268                                         reason += " Not loaded here:" + diffIneed;
 269                                 if (diffUneed.length())
 270                                         reason += " Not loaded there:" + diffUneed;
 271                                 this->SendError("CAPAB negotiation failed: "+reason);
 272                                 return false;
 273                         }
 274                 }
 275                 if (this->capab->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->capab->OptModuleList.length())
 276                 {
 277                         std::string diffIneed, diffUneed;
 278                         ListDifference(this->capab->OptModuleList, this->MyModules(VF_OPTCOMMON), ' ', diffIneed, diffUneed);
 279                         if (diffIneed.length() || diffUneed.length())
 280                         {
 281                                 if (Utils->AllowOptCommon)
 282                                 {
 283                                         ServerInstance->SNO->WriteToSnoMask('l',
 284                                                 "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 285                                                 diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 286                                                 diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 287                                 }
 288                                 else
 289                                 {
 290                                         reason = "Optional modules incorrectly matched on these servers, and options::allowmismatch not set.";
 291                                         if (diffIneed.length())
 292                                                 reason += " Not loaded here:" + diffIneed;
 293                                         if (diffUneed.length())
 294                                                 reason += " Not loaded there:" + diffUneed;
 295                                         this->SendError("CAPAB negotiation failed: "+reason);
 296                                         return false;
 297                                 }
 298                         }
 299                 }
 300
 301                 if(this->capab->CapKeys.find("PREFIX") != this->capab->CapKeys.end() && this->capab->CapKeys.find("PREFIX")->second != ServerInstance->Modes->BuildPrefixes())
 302                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 303
 304                 if (!capab->ChanModes.empty())
 305                 {
 306                         if (capab->ChanModes != BuildModeList(MODETYPE_CHANNEL))
 307                         {
 308                                 std::string diffIneed, diffUneed;
 309                                 ListDifference(capab->ChanModes, BuildModeList(MODETYPE_CHANNEL), ' ', diffIneed, diffUneed);
 310                                 if (diffIneed.length() || diffUneed.length())
 311                                 {
 312                                         reason = "Channel modes not matched on these servers.";
 313                                         if (diffIneed.length())
 314                                                 reason += " Not loaded here:" + diffIneed;
 315                                         if (diffUneed.length())
 316                                                 reason += " Not loaded there:" + diffUneed;
 317                                 }
 318                         }
 319                 }
 320                 else if (this->capab->CapKeys.find("CHANMODES") != this->capab->CapKeys.end())
 321                 {
 322                         if (this->capab->CapKeys.find("CHANMODES")->second != ServerInstance->Modes->GiveModeList(MODETYPE_CHANNEL))
 323                                 reason = "One or more of the channel modes on the remote server are invalid on this server.";
 324                 }
 325
 326                 if (!capab->UserModes.empty())
 327                 {
 328                         if (capab->UserModes != BuildModeList(MODETYPE_USER))
 329                         {
 330                                 std::string diffIneed, diffUneed;
 331                                 ListDifference(capab->UserModes, BuildModeList(MODETYPE_USER), ' ', diffIneed, diffUneed);
 332                                 if (diffIneed.length() || diffUneed.length())
 333                                 {
 334                                         reason = "User modes not matched on these servers.";
 335                                         if (diffIneed.length())
 336                                                 reason += " Not loaded here:" + diffIneed;
 337                                         if (diffUneed.length())
 338                                                 reason += " Not loaded there:" + diffUneed;
 339                                 }
 340                         }
 341                 }
 342                 else if (this->capab->CapKeys.find("USERMODES") != this->capab->CapKeys.end())
 343                 {
 344                         if (this->capab->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MODETYPE_USER))
 345                                 reason = "One or more of the user modes on the remote server are invalid on this server.";
 346                 }
 347                 else
 348                 {
 349                         // We default to rfc1459 here because if this key is not sent then
 350                         // the remote server is running the 2.0 protocol which uses rfc1459
 351                         // by default.
 352                         std::string casemapping = "rfc1459";
 353                         std::map<std::string, std::string>::iterator citer = this->capab->CapKeys.find("CASEMAPPING");
 354                         if (citer != this->capab->CapKeys.end())
 355                                 casemapping = citer->second;
 356
 357                         if (casemapping != ServerInstance->Config->CaseMapping)
 358                         {
 359                                 reason = "The casemapping of the remote server differs to that of the local server."
 360                                         " Local casemapping: " + ServerInstance->Config->CaseMapping +
 361                                         " Remote casemapping: " + casemapping;
 362                         }
 363
 364                 }
 365
 366                 /* Challenge response, store their challenge for our password */
 367                 std::map<std::string,std::string>::iterator n = this->capab->CapKeys.find("CHALLENGE");
 368                 if ((n != this->capab->CapKeys.end()) && (ServerInstance->Modules->FindService(SERVICE_DATA, "hash/sha256")))
 369                 {
 370                         /* Challenge-response is on now */
 371                         this->SetTheirChallenge(n->second);
 372                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 373                         {
 374                                 this->SendCapabilities(2);
 375                                 this->WriteLine("SERVER "+ServerInstance->Config->ServerName+" "+this->MakePass(capab->link->SendPass, capab->theirchallenge)+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 376                         }
 377                 }
 378                 else
 379                 {
 380                         // They didn't specify a challenge or we don't have sha256, we use plaintext
 381                         if (this->LinkState == CONNECTING)
 382                         {
 383                                 this->SendCapabilities(2);
 384                                 this->WriteLine("SERVER "+ServerInstance->Config->ServerName+" "+capab->link->SendPass+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 385                         }
 386                 }
 387
 388                 if (reason.length())
 389                 {
 390                         this->SendError("CAPAB negotiation failed: "+reason);
 391                         return false;
 392                 }
 393         }
 394         else if ((params[0] == "MODULES") && (params.size() == 2))
 395         {
 396                 if (!capab->ModuleList.length())
 397                 {
 398                         capab->ModuleList = params[1];
 399                 }
 400                 else
 401                 {
 402                         capab->ModuleList.push_back(' ');
 403                         capab->ModuleList.append(params[1]);
 404                 }
 405         }
 406         else if ((params[0] == "MODSUPPORT") && (params.size() == 2))
 407         {
 408                 if (!capab->OptModuleList.length())
 409                 {
 410                         capab->OptModuleList = params[1];
 411                 }
 412                 else
 413                 {
 414                         capab->OptModuleList.push_back(' ');
 415                         capab->OptModuleList.append(params[1]);
 416                 }
 417         }
 418         else if ((params[0] == "CHANMODES") && (params.size() == 2))
 419         {
 420                 capab->ChanModes = params[1];
 421         }
 422         else if ((params[0] == "USERMODES") && (params.size() == 2))
 423         {
 424                 capab->UserModes = params[1];
 425         }
 426         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 427         {
 428                 irc::tokenstream capabs(params[1]);
 429                 std::string item;
 430                 while (capabs.GetToken(item))
 431                 {
 432                         /* Process each key/value pair */
 433                         std::string::size_type equals = item.find('=');
 434                         if (equals != std::string::npos)
 435                         {
 436                                 std::string var(item, 0, equals);
 437                                 std::string value(item, equals+1);
 438                                 capab->CapKeys[var] = value;
 439                         }
 440                 }
 441         }
 442         return true;
 443 }