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 #include "xline.h"
  24
  25 #include "treesocket.h"
  26 #include "treeserver.h"
  27 #include "utils.h"
  28 #include "link.h"
  29 #include "main.h"
  30
  31 std::string TreeSocket::MyModules(int filter)
  32 {
  33         std::vector<std::string> modlist = ServerInstance->Modules->GetAllModuleNames(filter);
  34
  35         if (filter == VF_COMMON && proto_version != ProtocolVersion)
  36                 CompatAddModules(modlist);
  37
  38         std::string capabilities;
  39         sort(modlist.begin(),modlist.end());
  40         for (std::vector<std::string>::const_iterator i = modlist.begin(); i != modlist.end(); ++i)
  41         {
  42                 if (i != modlist.begin())
  43                         capabilities.push_back(' ');
  44                 capabilities.append(*i);
  45                 Module* m = ServerInstance->Modules->Find(*i);
  46                 Version v = m->GetVersion();
  47                 if (!v.link_data.empty())
  48                 {
  49                         capabilities.push_back('=');
  50                         capabilities.append(v.link_data);
  51                 }
  52         }
  53         return capabilities;
  54 }
  55
  56 static std::string BuildModeList(ModeType type)
  57 {
  58         std::vector<std::string> modes;
  59         for(char c='A'; c <= 'z'; c++)
  60         {
  61                 ModeHandler* mh = ServerInstance->Modes->FindMode(c, type);
  62                 if (mh)
  63                 {
  64                         std::string mdesc = mh->name;
  65                         mdesc.push_back('=');
  66                         if (mh->GetPrefix())
  67                                 mdesc.push_back(mh->GetPrefix());
  68                         if (mh->GetModeChar())
  69                                 mdesc.push_back(mh->GetModeChar());
  70                         modes.push_back(mdesc);
  71                 }
  72         }
  73         sort(modes.begin(), modes.end());
  74         irc::stringjoiner line(" ", modes, 0, modes.size() - 1);
  75         return line.GetJoined();
  76 }
  77
  78 void TreeSocket::SendCapabilities(int phase)
  79 {
  80         if (capab->capab_phase >= phase)
  81                 return;
  82
  83         if (capab->capab_phase < 1 && phase >= 1)
  84                 WriteLine("CAPAB START " + ConvToStr(ProtocolVersion));
  85
  86         capab->capab_phase = phase;
  87         if (phase < 2)
  88                 return;
  89
  90         const char sep = ' ';
  91         irc::sepstream modulelist(MyModules(VF_COMMON), sep);
  92         irc::sepstream optmodulelist(MyModules(VF_OPTCOMMON), sep);
  93         /* Send module names, split at 509 length */
  94         std::string item;
  95         std::string line = "CAPAB MODULES :";
  96         while (modulelist.GetToken(item))
  97         {
  98                 if (line.length() + item.length() + 1 > 509)
  99                 {
 100                         this->WriteLine(line);
 101                         line = "CAPAB MODULES :";
 102                 }
 103
 104                 if (line != "CAPAB MODULES :")
 105                         line.push_back(sep);
 106
 107                 line.append(item);
 108         }
 109         if (line != "CAPAB MODULES :")
 110                 this->WriteLine(line);
 111
 112         line = "CAPAB MODSUPPORT :";
 113         while (optmodulelist.GetToken(item))
 114         {
 115                 if (line.length() + item.length() + 1 > 509)
 116                 {
 117                         this->WriteLine(line);
 118                         line = "CAPAB MODSUPPORT :";
 119                 }
 120
 121                 if (line != "CAPAB MODSUPPORT :")
 122                         line.push_back(sep);
 123
 124                 line.append(item);
 125         }
 126         if (line != "CAPAB MODSUPPORT :")
 127                 this->WriteLine(line);
 128
 129         WriteLine("CAPAB CHANMODES :" + BuildModeList(MODETYPE_CHANNEL));
 130         WriteLine("CAPAB USERMODES :" + BuildModeList(MODETYPE_USER));
 131
 132         std::string extra;
 133         /* Do we have sha256 available? If so, we send a challenge */
 134         if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
 135         {
 136                 SetOurChallenge(ServerInstance->GenRandomStr(20));
 137                 extra = " CHALLENGE=" + this->GetOurChallenge();
 138         }
 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                         " IP6SUPPORT=1"+
 151                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
 152                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 153                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
 154                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
 155                         " SVSPART=1");
 156
 157         this->WriteLine("CAPAB END");
 158 }
 159
 160 /* Isolate and return the elements that are different between two comma seperated lists */
 161 void TreeSocket::ListDifference(const std::string &one, const std::string &two, char sep,
 162                 std::string& mleft, std::string& mright)
 163 {
 164         std::set<std::string> values;
 165         irc::sepstream sepleft(one, sep);
 166         irc::sepstream sepright(two, sep);
 167         std::string item;
 168         while (sepleft.GetToken(item))
 169         {
 170                 values.insert(item);
 171         }
 172         while (sepright.GetToken(item))
 173         {
 174                 if (!values.erase(item))
 175                 {
 176                         mright.push_back(sep);
 177                         mright.append(item);
 178                 }
 179         }
 180         for(std::set<std::string>::iterator i = values.begin(); i != values.end(); ++i)
 181         {
 182                 mleft.push_back(sep);
 183                 mleft.append(*i);
 184         }
 185 }
 186
 187 bool TreeSocket::Capab(const parameterlist &params)
 188 {
 189         if (params.size() < 1)
 190         {
 191                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 192                 return false;
 193         }
 194         if (params[0] == "START")
 195         {
 196                 capab->ModuleList.clear();
 197                 capab->OptModuleList.clear();
 198                 capab->CapKeys.clear();
 199                 if (params.size() > 1)
 200                         proto_version = atoi(params[1].c_str());
 201                 SendCapabilities(2);
 202         }
 203         else if (params[0] == "END")
 204         {
 205                 std::string reason;
 206                 /* Compare ModuleList and check CapKeys */
 207                 if ((this->capab->ModuleList != this->MyModules(VF_COMMON)) && (this->capab->ModuleList.length()))
 208                 {
 209                         std::string diffIneed, diffUneed;
 210                         ListDifference(this->capab->ModuleList, this->MyModules(VF_COMMON), ' ', diffIneed, diffUneed);
 211                         if (diffIneed.length() || diffUneed.length())
 212                         {
 213                                 reason = "Modules incorrectly matched on these servers.";
 214                                 if (diffIneed.length())
 215                                         reason += " Not loaded here:" + diffIneed;
 216                                 if (diffUneed.length())
 217                                         reason += " Not loaded there:" + diffUneed;
 218                                 this->SendError("CAPAB negotiation failed: "+reason);
 219                                 return false;
 220                         }
 221                 }
 222                 if (this->capab->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->capab->OptModuleList.length())
 223                 {
 224                         std::string diffIneed, diffUneed;
 225                         ListDifference(this->capab->OptModuleList, this->MyModules(VF_OPTCOMMON), ' ', diffIneed, diffUneed);
 226                         if (diffIneed.length() || diffUneed.length())
 227                         {
 228                                 if (Utils->AllowOptCommon)
 229                                 {
 230                                         ServerInstance->SNO->WriteToSnoMask('l',
 231                                                 "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 232                                                 diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 233                                                 diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 234                                 }
 235                                 else
 236                                 {
 237                                         reason = "Optional modules incorrectly matched on these servers, and options::allowmismatch not set.";
 238                                         if (diffIneed.length())
 239                                                 reason += " Not loaded here:" + diffIneed;
 240                                         if (diffUneed.length())
 241                                                 reason += " Not loaded there:" + diffUneed;
 242                                         this->SendError("CAPAB negotiation failed: "+reason);
 243                                         return false;
 244                                 }
 245                         }
 246                 }
 247
 248                 if (this->capab->CapKeys.find("PROTOCOL") == this->capab->CapKeys.end())
 249                 {
 250                         reason = "Protocol version not specified";
 251                 }
 252                 else
 253                 {
 254                         proto_version = atoi(capab->CapKeys.find("PROTOCOL")->second.c_str());
 255                         if (proto_version < MinCompatProtocol)
 256                         {
 257                                 reason = "Server is using protocol version " + ConvToStr(proto_version) +
 258                                         " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 259                                         + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
 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