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         const ModuleManager::ModuleMap& modlist = ServerInstance->Modules->GetModules();
  32
  33         std::string capabilities;
  34         for (ModuleManager::ModuleMap::const_iterator i = modlist.begin(); i != modlist.end(); ++i)
  35         {
  36                 Version v = i->second->GetVersion();
  37                 if (!(v.Flags & filter))
  38                         continue;
  39
  40                 if (i != modlist.begin())
  41                         capabilities.push_back(' ');
  42                 capabilities.append(i->first);
  43                 if (!v.link_data.empty())
  44                 {
  45                         capabilities.push_back('=');
  46                         capabilities.append(v.link_data);
  47                 }
  48         }
  49         return capabilities;
  50 }
  51
  52 static std::string BuildModeList(ModeType type)
  53 {
  54         std::vector<std::string> modes;
  55         for(char c='A'; c <= 'z'; c++)
  56         {
  57                 ModeHandler* mh = ServerInstance->Modes->FindMode(c, type);
  58                 if (mh)
  59                 {
  60                         std::string mdesc = mh->name;
  61                         mdesc.push_back('=');
  62                         if (mh->GetPrefix())
  63                                 mdesc.push_back(mh->GetPrefix());
  64                         if (mh->GetModeChar())
  65                                 mdesc.push_back(mh->GetModeChar());
  66                         modes.push_back(mdesc);
  67                 }
  68         }
  69         sort(modes.begin(), modes.end());
  70         irc::stringjoiner line(modes);
  71         return line.GetJoined();
  72 }
  73
  74 void TreeSocket::SendCapabilities(int phase)
  75 {
  76         if (capab->capab_phase >= phase)
  77                 return;
  78
  79         if (capab->capab_phase < 1 && phase >= 1)
  80                 WriteLine("CAPAB START " + ConvToStr(ProtocolVersion));
  81
  82         capab->capab_phase = phase;
  83         if (phase < 2)
  84                 return;
  85
  86         const char sep = ' ';
  87         irc::sepstream modulelist(MyModules(VF_COMMON), sep);
  88         irc::sepstream optmodulelist(MyModules(VF_OPTCOMMON), sep);
  89         /* Send module names, split at 509 length */
  90         std::string item;
  91         std::string line = "CAPAB MODULES :";
  92         while (modulelist.GetToken(item))
  93         {
  94                 if (line.length() + item.length() + 1 > 509)
  95                 {
  96                         this->WriteLine(line);
  97                         line = "CAPAB MODULES :";
  98                 }
  99
 100                 if (line != "CAPAB MODULES :")
 101                         line.push_back(sep);
 102
 103                 line.append(item);
 104         }
 105         if (line != "CAPAB MODULES :")
 106                 this->WriteLine(line);
 107
 108         line = "CAPAB MODSUPPORT :";
 109         while (optmodulelist.GetToken(item))
 110         {
 111                 if (line.length() + item.length() + 1 > 509)
 112                 {
 113                         this->WriteLine(line);
 114                         line = "CAPAB MODSUPPORT :";
 115                 }
 116
 117                 if (line != "CAPAB MODSUPPORT :")
 118                         line.push_back(sep);
 119
 120                 line.append(item);
 121         }
 122         if (line != "CAPAB MODSUPPORT :")
 123                 this->WriteLine(line);
 124
 125         WriteLine("CAPAB CHANMODES :" + BuildModeList(MODETYPE_CHANNEL));
 126         WriteLine("CAPAB USERMODES :" + BuildModeList(MODETYPE_USER));
 127
 128         std::string extra;
 129         /* Do we have sha256 available? If so, we send a challenge */
 130         if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
 131         {
 132                 SetOurChallenge(ServerInstance->GenRandomStr(20));
 133                 extra = " CHALLENGE=" + this->GetOurChallenge();
 134         }
 135
 136         // 2.0 needs this key
 137         if (proto_version == 1202)
 138                 extra.append(" PROTOCOL="+ConvToStr(ProtocolVersion));
 139
 140         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
 141                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
 142                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
 143                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
 144                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
 145                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
 146                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
 147                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
 148                         " MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
 149                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
 150                         extra+
 151                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 152                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
 153                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)
 154                         );
 155
 156         this->WriteLine("CAPAB END");
 157 }
 158
 159 /* Isolate and return the elements that are different between two comma seperated lists */
 160 void TreeSocket::ListDifference(const std::string &one, const std::string &two, char sep,
 161                 std::string& mleft, std::string& mright)
 162 {
 163         std::set<std::string> values;
 164         irc::sepstream sepleft(one, sep);
 165         irc::sepstream sepright(two, sep);
 166         std::string item;
 167         while (sepleft.GetToken(item))
 168         {
 169                 values.insert(item);
 170         }
 171         while (sepright.GetToken(item))
 172         {
 173                 if (!values.erase(item))
 174                 {
 175                         mright.push_back(sep);
 176                         mright.append(item);
 177                 }
 178         }
 179         for(std::set<std::string>::iterator i = values.begin(); i != values.end(); ++i)
 180         {
 181                 mleft.push_back(sep);
 182                 mleft.append(*i);
 183         }
 184 }
 185
 186 bool TreeSocket::Capab(const parameterlist &params)
 187 {
 188         if (params.size() < 1)
 189         {
 190                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 191                 return false;
 192         }
 193         if (params[0] == "START")
 194         {
 195                 capab->ModuleList.clear();
 196                 capab->OptModuleList.clear();
 197                 capab->CapKeys.clear();
 198                 if (params.size() > 1)
 199                         proto_version = ConvToInt(params[1]);
 200
 201                 if (proto_version < MinCompatProtocol)
 202                 {
 203                         SendError("CAPAB negotiation failed: Server is using protocol version " + (proto_version ? ConvToStr(proto_version) : "1201 or older")
 204                                 + " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 205                                 + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")"));
 206                         return false;
 207                 }
 208
 209                 // Special case, may be removed in the future
 210                 if (proto_version == 1203 || proto_version == 1204)
 211                 {
 212                         SendError("CAPAB negotiation failed: InspIRCd 2.1 beta is not supported");
 213                         return false;
 214                 }
 215
 216                 SendCapabilities(2);
 217         }
 218         else if (params[0] == "END")
 219         {
 220                 std::string reason;
 221                 /* Compare ModuleList and check CapKeys */
 222                 if ((this->capab->ModuleList != this->MyModules(VF_COMMON)) && (this->capab->ModuleList.length()))
 223                 {
 224                         std::string diffIneed, diffUneed;
 225                         ListDifference(this->capab->ModuleList, this->MyModules(VF_COMMON), ' ', diffIneed, diffUneed);
 226                         if (diffIneed.length() || diffUneed.length())
 227                         {
 228                                 reason = "Modules incorrectly matched on these servers.";
 229                                 if (diffIneed.length())
 230                                         reason += " Not loaded here:" + diffIneed;
 231                                 if (diffUneed.length())
 232                                         reason += " Not loaded there:" + diffUneed;
 233                                 this->SendError("CAPAB negotiation failed: "+reason);
 234                                 return false;
 235                         }
 236                 }
 237                 if (this->capab->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->capab->OptModuleList.length())
 238                 {
 239                         std::string diffIneed, diffUneed;
 240                         ListDifference(this->capab->OptModuleList, this->MyModules(VF_OPTCOMMON), ' ', diffIneed, diffUneed);
 241                         if (diffIneed.length() || diffUneed.length())
 242                         {
 243                                 if (Utils->AllowOptCommon)
 244                                 {
 245                                         ServerInstance->SNO->WriteToSnoMask('l',
 246                                                 "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 247                                                 diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 248                                                 diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 249                                 }
 250                                 else
 251                                 {
 252                                         reason = "Optional modules incorrectly matched on these servers, and options::allowmismatch not set.";
 253                                         if (diffIneed.length())
 254                                                 reason += " Not loaded here:" + diffIneed;
 255                                         if (diffUneed.length())
 256                                                 reason += " Not loaded there:" + diffUneed;
 257                                         this->SendError("CAPAB negotiation failed: "+reason);
 258                                         return false;
 259                                 }
 260                         }
 261                 }
 262
 263                 if(this->capab->CapKeys.find("PREFIX") != this->capab->CapKeys.end() && this->capab->CapKeys.find("PREFIX")->second != ServerInstance->Modes->BuildPrefixes())
 264                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 265
 266                 if (!capab->ChanModes.empty())
 267                 {
 268                         if (capab->ChanModes != BuildModeList(MODETYPE_CHANNEL))
 269                         {
 270                                 std::string diffIneed, diffUneed;
 271                                 ListDifference(capab->ChanModes, BuildModeList(MODETYPE_CHANNEL), ' ', diffIneed, diffUneed);
 272                                 if (diffIneed.length() || diffUneed.length())
 273                                 {
 274                                         reason = "Channel modes not matched on these servers.";
 275                                         if (diffIneed.length())
 276                                                 reason += " Not loaded here:" + diffIneed;
 277                                         if (diffUneed.length())
 278                                                 reason += " Not loaded there:" + diffUneed;
 279                                 }
 280                         }
 281                 }
 282                 else if (this->capab->CapKeys.find("CHANMODES") != this->capab->CapKeys.end())
 283                 {
 284                         if (this->capab->CapKeys.find("CHANMODES")->second != ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
 285                                 reason = "One or more of the channel modes on the remote server are invalid on this server.";
 286                 }
 287
 288                 if (!capab->UserModes.empty())
 289                 {
 290                         if (capab->UserModes != BuildModeList(MODETYPE_USER))
 291                         {
 292                                 std::string diffIneed, diffUneed;
 293                                 ListDifference(capab->UserModes, BuildModeList(MODETYPE_USER), ' ', diffIneed, diffUneed);
 294                                 if (diffIneed.length() || diffUneed.length())
 295                                 {
 296                                         reason = "User modes not matched on these servers.";
 297                                         if (diffIneed.length())
 298                                                 reason += " Not loaded here:" + diffIneed;
 299                                         if (diffUneed.length())
 300                                                 reason += " Not loaded there:" + diffUneed;
 301                                 }
 302                         }
 303                 }
 304                 else if (this->capab->CapKeys.find("USERMODES") != this->capab->CapKeys.end())
 305                 {
 306                         if (this->capab->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MASK_USER))
 307                                 reason = "One or more of the user modes on the remote server are invalid on this server.";
 308                 }
 309
 310                 /* Challenge response, store their challenge for our password */
 311                 std::map<std::string,std::string>::iterator n = this->capab->CapKeys.find("CHALLENGE");
 312                 if (Utils->ChallengeResponse && (n != this->capab->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
 313                 {
 314                         /* Challenge-response is on now */
 315                         this->SetTheirChallenge(n->second);
 316                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 317                         {
 318                                 this->SendCapabilities(2);
 319                                 this->WriteLine("SERVER "+ServerInstance->Config->ServerName+" "+this->MakePass(capab->link->SendPass, capab->theirchallenge)+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 320                         }
 321                 }
 322                 else
 323                 {
 324                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 325                         if (this->LinkState == CONNECTING)
 326                         {
 327                                 this->SendCapabilities(2);
 328                                 this->WriteLine("SERVER "+ServerInstance->Config->ServerName+" "+capab->link->SendPass+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 329                         }
 330                 }
 331
 332                 if (reason.length())
 333                 {
 334                         this->SendError("CAPAB negotiation failed: "+reason);
 335                         return false;
 336                 }
 337         }
 338         else if ((params[0] == "MODULES") && (params.size() == 2))
 339         {
 340                 if (!capab->ModuleList.length())
 341                 {
 342                         capab->ModuleList = params[1];
 343                 }
 344                 else
 345                 {
 346                         capab->ModuleList.push_back(' ');
 347                         capab->ModuleList.append(params[1]);
 348                 }
 349         }
 350         else if ((params[0] == "MODSUPPORT") && (params.size() == 2))
 351         {
 352                 if (!capab->OptModuleList.length())
 353                 {
 354                         capab->OptModuleList = params[1];
 355                 }
 356                 else
 357                 {
 358                         capab->OptModuleList.push_back(' ');
 359                         capab->OptModuleList.append(params[1]);
 360                 }
 361         }
 362         else if ((params[0] == "CHANMODES") && (params.size() == 2))
 363         {
 364                 capab->ChanModes = params[1];
 365         }
 366         else if ((params[0] == "USERMODES") && (params.size() == 2))
 367         {
 368                 capab->UserModes = params[1];
 369         }
 370         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 371         {
 372                 irc::tokenstream capabs(params[1]);
 373                 std::string item;
 374                 while (capabs.GetToken(item))
 375                 {
 376                         /* Process each key/value pair */
 377                         std::string::size_type equals = item.find('=');
 378                         if (equals != std::string::npos)
 379                         {
 380                                 std::string var = item.substr(0, equals);
 381                                 std::string value = item.substr(equals+1, item.length());
 382                                 capab->CapKeys[var] = value;
 383                         }
 384                 }
 385         }
 386         return true;
 387 }
 388