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 < PROTO_INSPIRCD_30 && mod->ModuleSourceFile == "m_kicknorejoin.so")
  51                         continue;
  52
  53                 bool do_compat_include = false;
  54                 if (proto_version < PROTO_INSPIRCD_30)
  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 = mod->GetVersion();
  67                 if ((!do_compat_include) && (!(v.Flags & filter)))
  68                         continue;
  69
  70                 capabilities.push_back(' ');
  71                 capabilities.append(i->first);
  72                 if (!v.link_data.empty())
  73                 {
  74                         capabilities.push_back('=');
  75                         capabilities.append(v.link_data);
  76                 }
  77         }
  78
  79         // If we are linked in a 2.0 server and have an ascii casemapping
  80         // advertise it as m_ascii.so from inspircd-extras
  81         if ((filter & VF_COMMON) && ServerInstance->Config->CaseMapping == "ascii" && proto_version == PROTO_INSPIRCD_20)
  82                 capabilities.append(" m_ascii.so");
  83
  84         if (capabilities.empty())
  85                 return capabilities;
  86
  87         return capabilities.substr(1);
  88 }
  89
  90 std::string TreeSocket::BuildModeList(ModeType mtype)
  91 {
  92         std::vector<std::string> modes;
  93         const ModeParser::ModeHandlerMap& mhs = ServerInstance->Modes.GetModes(mtype);
  94         for (ModeParser::ModeHandlerMap::const_iterator i = mhs.begin(); i != mhs.end(); ++i)
  95         {
  96                 const ModeHandler* const mh = i->second;
  97                 const PrefixMode* const pm = mh->IsPrefixMode();
  98                 std::string mdesc;
  99                 if (proto_version >= PROTO_INSPIRCD_30)
 100                 {
 101                         if (pm)
 102                                 mdesc.append("prefix:").append(ConvToStr(pm->GetPrefixRank())).push_back(':');
 103                         else if (mh->IsListMode())
 104                                 mdesc.append("list:");
 105                         else if (mh->NeedsParam(true))
 106                                 mdesc.append(mh->NeedsParam(false) ? "param:" : "param-set:");
 107                         else
 108                                 mdesc.append("simple:");
 109                 }
 110                 mdesc.append(mh->name);
 111                 mdesc.push_back('=');
 112                 if (pm)
 113                 {
 114                         if (pm->GetPrefix())
 115                                 mdesc.push_back(pm->GetPrefix());
 116                 }
 117                 mdesc.push_back(mh->GetModeChar());
 118                 modes.push_back(mdesc);
 119         }
 120         std::sort(modes.begin(), modes.end());
 121         return stdalgo::string::join(modes);
 122 }
 123
 124 void TreeSocket::SendCapabilities(int phase)
 125 {
 126         if (capab->capab_phase >= phase)
 127                 return;
 128
 129         if (capab->capab_phase < 1 && phase >= 1)
 130                 WriteLine("CAPAB START " + ConvToStr(PROTO_NEWEST));
 131
 132         capab->capab_phase = phase;
 133         if (phase < 2)
 134                 return;
 135
 136         const char sep = ' ';
 137         irc::sepstream modulelist(MyModules(VF_COMMON), sep);
 138         irc::sepstream optmodulelist(MyModules(VF_OPTCOMMON), sep);
 139         /* Send module names, split at 509 length */
 140         std::string item;
 141         std::string line = "CAPAB MODULES :";
 142         while (modulelist.GetToken(item))
 143         {
 144                 if (line.length() + item.length() + 1 > 509)
 145                 {
 146                         this->WriteLine(line);
 147                         line = "CAPAB MODULES :";
 148                 }
 149
 150                 if (line != "CAPAB MODULES :")
 151                         line.push_back(sep);
 152
 153                 line.append(item);
 154         }
 155         if (line != "CAPAB MODULES :")
 156                 this->WriteLine(line);
 157
 158         line = "CAPAB MODSUPPORT :";
 159         while (optmodulelist.GetToken(item))
 160         {
 161                 if (line.length() + item.length() + 1 > 509)
 162                 {
 163                         this->WriteLine(line);
 164                         line = "CAPAB MODSUPPORT :";
 165                 }
 166
 167                 if (line != "CAPAB MODSUPPORT :")
 168                         line.push_back(sep);
 169
 170                 line.append(item);
 171         }
 172         if (line != "CAPAB MODSUPPORT :")
 173                 this->WriteLine(line);
 174
 175         WriteLine("CAPAB CHANMODES :" + BuildModeList(MODETYPE_CHANNEL));
 176         WriteLine("CAPAB USERMODES :" + BuildModeList(MODETYPE_USER));
 177
 178         std::string extra;
 179         /* Do we have sha256 available? If so, we send a challenge */
 180         if (ServerInstance->Modules->FindService(SERVICE_DATA, "hash/sha256"))
 181         {
 182                 SetOurChallenge(ServerInstance->GenRandomStr(20));
 183                 extra = " CHALLENGE=" + this->GetOurChallenge();
 184         }
 185
 186         // 2.0 needs these keys.
 187         if (proto_version == PROTO_INSPIRCD_20)
 188         {
 189                 extra.append(" PROTOCOL="+ConvToStr(proto_version))
 190                         .append(" MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxReal))
 191                         .append(" CHANMODES="+ServerInstance->Modes->GiveModeList(MODETYPE_CHANNEL))
 192                         .append(" USERMODES="+ServerInstance->Modes->GiveModeList(MODETYPE_USER))
 193                         .append(" PREFIX="+ ServerInstance->Modes->BuildPrefixes());
 194         }
 195
 196         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
 197                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
 198                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
 199                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
 200                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
 201                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
 202                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
 203                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
 204                         " MAXREAL="+ConvToStr(ServerInstance->Config->Limits.MaxReal)+
 205                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
 206                         " MAXHOST="+ConvToStr(ServerInstance->Config->Limits.MaxHost)+
 207                         extra+
 208                         " CASEMAPPING="+ServerInstance->Config->CaseMapping+
 209                         // XXX: Advertise the presence or absence of m_globops in CAPAB CAPABILITIES.
 210                         // Services want to know about it, and since m_globops was not marked as VF_(OPT)COMMON
 211                         // in 2.0, we advertise it here to not break linking to previous versions.
 212                         // Protocol version 1201 (1.2) does not have this issue because we advertise m_globops
 213                         // to 1201 protocol servers irrespectively of its module flags.
 214                         (ServerInstance->Modules->Find("m_globops.so") != NULL ? " GLOBOPS=1" : " GLOBOPS=0")
 215                         );
 216
 217         this->WriteLine("CAPAB END");
 218 }
 219
 220 /* Isolate and return the elements that are different between two comma seperated lists */
 221 void TreeSocket::ListDifference(const std::string &one, const std::string &two, char sep,
 222                 std::string& mleft, std::string& mright)
 223 {
 224         std::set<std::string> values;
 225         irc::sepstream sepleft(one, sep);
 226         irc::sepstream sepright(two, sep);
 227         std::string item;
 228         while (sepleft.GetToken(item))
 229         {
 230                 values.insert(item);
 231         }
 232         while (sepright.GetToken(item))
 233         {
 234                 if (!values.erase(item))
 235                 {
 236                         mright.push_back(sep);
 237                         mright.append(item);
 238                 }
 239         }
 240         for(std::set<std::string>::iterator i = values.begin(); i != values.end(); ++i)
 241         {
 242                 mleft.push_back(sep);
 243                 mleft.append(*i);
 244         }
 245 }
 246
 247 bool TreeSocket::Capab(const CommandBase::Params& params)
 248 {
 249         if (params.size() < 1)
 250         {
 251                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 252                 return false;
 253         }
 254         if (params[0] == "START")
 255         {
 256                 capab->ModuleList.clear();
 257                 capab->OptModuleList.clear();
 258                 capab->CapKeys.clear();
 259                 if (params.size() > 1)
 260                         proto_version = ConvToNum<unsigned int>(params[1]);
 261
 262                 if (proto_version < PROTO_OLDEST)
 263                 {
 264                         SendError("CAPAB negotiation failed: Server is using protocol version "
 265                                 + (proto_version ? ConvToStr(proto_version) : "1201 or older")
 266                                 + " which is too old to link with this server (protocol versions "
 267                                 + ConvToStr(PROTO_OLDEST) + " to " + ConvToStr(PROTO_NEWEST) + " are supported)");
 268                         return false;
 269                 }
 270
 271                 // We don't support the 2.1 protocol.
 272                 if (proto_version == PROTO_INSPIRCD_21_A0 || proto_version == PROTO_INSPIRCD_21_B2)
 273                 {
 274                         SendError("CAPAB negotiation failed: InspIRCd 2.1 beta is not supported");
 275                         return false;
 276                 }
 277
 278                 SendCapabilities(2);
 279         }
 280         else if (params[0] == "END")
 281         {
 282                 std::string reason;
 283                 /* Compare ModuleList and check CapKeys */
 284                 if ((this->capab->ModuleList != this->MyModules(VF_COMMON)) && (this->capab->ModuleList.length()))
 285                 {
 286                         std::string diffIneed, diffUneed;
 287                         ListDifference(this->capab->ModuleList, this->MyModules(VF_COMMON), ' ', diffIneed, diffUneed);
 288                         if (diffIneed.length() || diffUneed.length())
 289                         {
 290                                 reason = "Modules incorrectly matched on these servers.";
 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                 if (this->capab->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->capab->OptModuleList.length())
 301                 {
 302                         std::string diffIneed, diffUneed;
 303                         ListDifference(this->capab->OptModuleList, this->MyModules(VF_OPTCOMMON), ' ', diffIneed, diffUneed);
 304                         if (diffIneed.length() || diffUneed.length())
 305                         {
 306                                 if (Utils->AllowOptCommon)
 307                                 {
 308                                         ServerInstance->SNO->WriteToSnoMask('l',
 309                                                 "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 310                                                 diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 311                                                 diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 312                                 }
 313                                 else
 314                                 {
 315                                         reason = "Optional modules incorrectly matched on these servers and <options:allowmismatch> is not enabled.";
 316                                         if (diffIneed.length())
 317                                                 reason += " Not loaded here:" + diffIneed;
 318                                         if (diffUneed.length())
 319                                                 reason += " Not loaded there:" + diffUneed;
 320                                         this->SendError("CAPAB negotiation failed: "+reason);
 321                                         return false;
 322                                 }
 323                         }
 324                 }
 325
 326                 if (!capab->ChanModes.empty())
 327                 {
 328                         if (capab->ChanModes != BuildModeList(MODETYPE_CHANNEL))
 329                         {
 330                                 std::string diffIneed, diffUneed;
 331                                 ListDifference(capab->ChanModes, BuildModeList(MODETYPE_CHANNEL), ' ', diffIneed, diffUneed);
 332                                 if (diffIneed.length() || diffUneed.length())
 333                                 {
 334                                         reason = "Channel 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 (proto_version == PROTO_INSPIRCD_20)
 343                 {
 344                         if (this->capab->CapKeys.find("CHANMODES") != this->capab->CapKeys.end())
 345                         {
 346                                 if (this->capab->CapKeys.find("CHANMODES")->second != ServerInstance->Modes->GiveModeList(MODETYPE_CHANNEL))
 347                                         reason = "One or more of the channel modes on the remote server are invalid on this server.";
 348                         }
 349
 350                         else if (this->capab->CapKeys.find("PREFIX") != this->capab->CapKeys.end())
 351                         {
 352                                 if (this->capab->CapKeys.find("PREFIX")->second != ServerInstance->Modes->BuildPrefixes())
 353                                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 354                         }
 355                 }
 356
 357                 if (!reason.empty())
 358                 {
 359                         this->SendError("CAPAB negotiation failed: " + reason);
 360                         return false;
 361                 }
 362
 363                 if (!capab->UserModes.empty())
 364                 {
 365                         if (capab->UserModes != BuildModeList(MODETYPE_USER))
 366                         {
 367                                 std::string diffIneed, diffUneed;
 368                                 ListDifference(capab->UserModes, BuildModeList(MODETYPE_USER), ' ', diffIneed, diffUneed);
 369                                 if (diffIneed.length() || diffUneed.length())
 370                                 {
 371                                         reason = "User modes not matched on these servers.";
 372                                         if (diffIneed.length())
 373                                                 reason += " Not loaded here:" + diffIneed;
 374                                         if (diffUneed.length())
 375                                                 reason += " Not loaded there:" + diffUneed;
 376                                 }
 377                         }
 378                 }
 379                 else if (proto_version == PROTO_INSPIRCD_20 && this->capab->CapKeys.find("USERMODES") != this->capab->CapKeys.end())
 380                 {
 381                         if (this->capab->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MODETYPE_USER))
 382                                 reason = "One or more of the user modes on the remote server are invalid on this server.";
 383                 }
 384
 385                 if (!reason.empty())
 386                 {
 387                         this->SendError("CAPAB negotiation failed: " + reason);
 388                         return false;
 389                 }
 390
 391                 if (this->capab->CapKeys.find("CASEMAPPING") != this->capab->CapKeys.end())
 392                 {
 393                         const std::string casemapping = this->capab->CapKeys.find("CASEMAPPING")->second;
 394                         if (casemapping != ServerInstance->Config->CaseMapping)
 395                         {
 396                                 reason = "The casemapping of the remote server differs to that of the local server."
 397                                         " Local casemapping: " + ServerInstance->Config->CaseMapping +
 398                                         " Remote casemapping: " + casemapping;
 399                                 this->SendError("CAPAB negotiation failed: " + reason);
 400                                 return false;
 401                         }
 402                 }
 403
 404                 /* Challenge response, store their challenge for our password */
 405                 std::map<std::string,std::string>::iterator n = this->capab->CapKeys.find("CHALLENGE");
 406                 if ((n != this->capab->CapKeys.end()) && (ServerInstance->Modules->FindService(SERVICE_DATA, "hash/sha256")))
 407                 {
 408                         /* Challenge-response is on now */
 409                         this->SetTheirChallenge(n->second);
 410                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 411                         {
 412                                 this->SendCapabilities(2);
 413                                 this->WriteLine("SERVER "+ServerInstance->Config->ServerName+" "+this->MakePass(capab->link->SendPass, capab->theirchallenge)+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 414                         }
 415                 }
 416                 else
 417                 {
 418                         // They didn't specify a challenge or we don't have sha256, we use plaintext
 419                         if (this->LinkState == CONNECTING)
 420                         {
 421                                 this->SendCapabilities(2);
 422                                 this->WriteLine("SERVER "+ServerInstance->Config->ServerName+" "+capab->link->SendPass+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 423                         }
 424                 }
 425         }
 426         else if ((params[0] == "MODULES") && (params.size() == 2))
 427         {
 428                 if (!capab->ModuleList.length())
 429                 {
 430                         capab->ModuleList = params[1];
 431                 }
 432                 else
 433                 {
 434                         capab->ModuleList.push_back(' ');
 435                         capab->ModuleList.append(params[1]);
 436                 }
 437         }
 438         else if ((params[0] == "MODSUPPORT") && (params.size() == 2))
 439         {
 440                 if (!capab->OptModuleList.length())
 441                 {
 442                         capab->OptModuleList = params[1];
 443                 }
 444                 else
 445                 {
 446                         capab->OptModuleList.push_back(' ');
 447                         capab->OptModuleList.append(params[1]);
 448                 }
 449         }
 450         else if ((params[0] == "CHANMODES") && (params.size() == 2))
 451         {
 452                 capab->ChanModes = params[1];
 453         }
 454         else if ((params[0] == "USERMODES") && (params.size() == 2))
 455         {
 456                 capab->UserModes = params[1];
 457         }
 458         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 459         {
 460                 irc::spacesepstream capabs(params[1]);
 461                 std::string item;
 462                 while (capabs.GetToken(item))
 463                 {
 464                         /* Process each key/value pair */
 465                         std::string::size_type equals = item.find('=');
 466                         if (equals != std::string::npos)
 467                         {
 468                                 std::string var(item, 0, equals);
 469                                 std::string value(item, equals+1);
 470                                 capab->CapKeys[var] = value;
 471                         }
 472                 }
 473         }
 474         return true;
 475 }