src/modules/m_spanningtree/capab.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "xline.h"
  16
  17 #include "treesocket.h"
  18 #include "treeserver.h"
  19 #include "utils.h"
  20 #include "main.h"
  21
  22 std::string TreeSocket::MyModules(int filter)
  23 {
  24         std::vector<std::string> modlist = ServerInstance->Modules->GetAllModuleNames(filter);
  25
  26         if (filter == VF_COMMON && proto_version != ProtocolVersion)
  27                 CompatAddModules(modlist);
  28
  29         std::string capabilities;
  30         sort(modlist.begin(),modlist.end());
  31         for (unsigned int i = 0; i < modlist.size(); i++)
  32         {
  33                 if (i)
  34                         capabilities.push_back(proto_version > 1201 ? ' ' : ',');
  35                 capabilities.append(modlist[i]);
  36                 Module* m = ServerInstance->Modules->Find(modlist[i]);
  37                 if (m && proto_version > 1201)
  38                 {
  39                         Version v = m->GetVersion();
  40                         if (!v.link_data.empty())
  41                         {
  42                                 capabilities.push_back('=');
  43                                 capabilities.append(v.link_data);
  44                         }
  45                 }
  46         }
  47         return capabilities;
  48 }
  49
  50 static std::string BuildModeList(ModeType type)
  51 {
  52         std::vector<std::string> modes;
  53         for(char c='A'; c <= 'z'; c++)
  54         {
  55                 ModeHandler* mh = ServerInstance->Modes->FindMode(c, type)
  56                 if (mh)
  57                 {
  58                         std::string mdesc = mh->name;
  59                         mdesc.push_back('=');
  60                         if (mh->GetPrefix())
  61                                 mdesc.push_back(mh->GetPrefix());
  62                         if (mh->GetModeChar())
  63                                 mdesc.push_back(mh->GetModeChar());
  64                         modes.push_back(mdesc);
  65                 }
  66         }
  67         sort(modes.begin(), modes.end());
  68         irc::stringjoiner line(" ", modes, 0, modes.size() - 1);
  69         return line.GetJoined();
  70 }
  71
  72 void TreeSocket::SendCapabilities(int phase)
  73 {
  74         if (capab->capab_phase >= phase)
  75                 return;
  76
  77         if (capab->capab_phase < 1 && phase >= 1)
  78                 WriteLine("CAPAB START " + ConvToStr(ProtocolVersion));
  79
  80         capab->capab_phase = phase;
  81         if (phase < 2)
  82                 return;
  83
  84         char sep = proto_version > 1201 ? ' ' : ',';
  85         irc::sepstream modulelist(MyModules(VF_COMMON), sep);
  86         irc::sepstream optmodulelist(MyModules(VF_OPTCOMMON), sep);
  87         /* Send module names, split at 509 length */
  88         std::string item;
  89         std::string line = "CAPAB MODULES :";
  90         while (modulelist.GetToken(item))
  91         {
  92                 if (line.length() + item.length() + 1 > 509)
  93                 {
  94                         this->WriteLine(line);
  95                         line = "CAPAB MODULES :";
  96                 }
  97
  98                 if (line != "CAPAB MODULES :")
  99                         line.push_back(sep);
 100
 101                 line.append(item);
 102         }
 103         if (line != "CAPAB MODULES :")
 104                 this->WriteLine(line);
 105
 106         line = "CAPAB MODSUPPORT :";
 107         while (optmodulelist.GetToken(item))
 108         {
 109                 if (line.length() + item.length() + 1 > 509)
 110                 {
 111                         this->WriteLine(line);
 112                         line = "CAPAB MODSUPPORT :";
 113                 }
 114
 115                 if (line != "CAPAB MODSUPPORT :")
 116                         line.push_back(sep);
 117
 118                 line.append(item);
 119         }
 120         if (line != "CAPAB MODSUPPORT :")
 121                 this->WriteLine(line);
 122
 123         WriteLine("CAPAB CHANMODES :" + BuildModeList(MODETYPE_CHANNEL));
 124         WriteLine("CAPAB USERMODES :" + BuildModeList(MODETYPE_USER));
 125
 126         int ip6 = 0;
 127 #ifdef IPV6
 128         ip6 = 1;
 129 #endif
 130         std::string extra;
 131         /* Do we have sha256 available? If so, we send a challenge */
 132         if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
 133         {
 134                 SetOurChallenge(ServerInstance->GenRandomStr(20));
 135                 extra = " CHALLENGE=" + this->GetOurChallenge();
 136         }
 137
 138         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
 139                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
 140                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
 141                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
 142                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
 143                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
 144                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
 145                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
 146                         " MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
 147                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
 148                         " IP6NATIVE="+ConvToStr(ip6)+
 149                         " IP6SUPPORT=1"+
 150                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
 151                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 152                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
 153                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
 154                         " SVSPART=1");
 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 = atoi(params[1].c_str());
 200                 SendCapabilities(2);
 201         }
 202         else if (params[0] == "END")
 203         {
 204                 std::string reason;
 205                 /* Compare ModuleList and check CapKeys */
 206                 if ((this->capab->ModuleList != this->MyModules(VF_COMMON)) && (this->capab->ModuleList.length()))
 207                 {
 208                         std::string diffIneed, diffUneed;
 209                         ListDifference(this->capab->ModuleList, this->MyModules(VF_COMMON), proto_version > 1201 ? ' ' : ',', diffIneed, diffUneed);
 210                         if (diffIneed.length() || diffUneed.length())
 211                         {
 212                                 reason = "Modules incorrectly matched on these servers.";
 213                                 if (diffIneed.length())
 214                                         reason += " Not loaded here:" + diffIneed;
 215                                 if (diffUneed.length())
 216                                         reason += " Not loaded there:" + diffUneed;
 217                                 this->SendError("CAPAB negotiation failed: "+reason);
 218                                 return false;
 219                         }
 220                 }
 221                 if (this->capab->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->capab->OptModuleList.length())
 222                 {
 223                         std::string diffIneed, diffUneed;
 224                         ListDifference(this->capab->OptModuleList, this->MyModules(VF_OPTCOMMON), ' ', diffIneed, diffUneed);
 225                         if (diffIneed.length() || diffUneed.length())
 226                         {
 227                                 if (Utils->AllowOptCommon)
 228                                 {
 229                                         ServerInstance->SNO->WriteToSnoMask('l',
 230                                                 "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 231                                                 diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 232                                                 diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 233                                 }
 234                                 else
 235                                 {
 236                                         reason = "Optional modules incorrectly matched on these servers, and options::allowmismatch not set.";
 237                                         if (diffIneed.length())
 238                                                 reason += " Not loaded here:" + diffIneed;
 239                                         if (diffUneed.length())
 240                                                 reason += " Not loaded there:" + diffUneed;
 241                                         this->SendError("CAPAB negotiation failed: "+reason);
 242                                         return false;
 243                                 }
 244                         }
 245                 }
 246
 247                 if (this->capab->CapKeys.find("PROTOCOL") == this->capab->CapKeys.end())
 248                 {
 249                         reason = "Protocol version not specified";
 250                 }
 251                 else
 252                 {
 253                         proto_version = atoi(capab->CapKeys.find("PROTOCOL")->second.c_str());
 254                         if (proto_version < MinCompatProtocol)
 255                         {
 256                                 reason = "Server is using protocol version " + ConvToStr(proto_version) +
 257                                         " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 258                                         + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
 259                         }
 260                 }
 261
 262                 if(this->capab->CapKeys.find("PREFIX") != this->capab->CapKeys.end() && this->capab->CapKeys.find("PREFIX")->second != ServerInstance->Modes->BuildPrefixes())
 263                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 264
 265                 if (!capab->ChanModes.empty())
 266                 {
 267                         if (capab->ChanModes != BuildModeList(MODETYPE_CHANNEL))
 268                         {
 269                                 std::string diffIneed, diffUneed;
 270                                 ListDifference(capab->ChanModes, BuildModeList(MODETYPE_CHANNEL), ' ', diffIneed, diffUneed);
 271                                 if (diffIneed.length() || diffUneed.length())
 272                                 {
 273                                         reason = "Channel modes not matched on these servers.";
 274                                         if (diffIneed.length())
 275                                                 reason += " Not loaded here:" + diffIneed;
 276                                         if (diffUneed.length())
 277                                                 reason += " Not loaded there:" + diffUneed;
 278                                 }
 279                         }
 280                 }
 281                 else if (this->capab->CapKeys.find("CHANMODES") != this->capab->CapKeys.end())
 282                 {
 283                         if (this->capab->CapKeys.find("CHANMODES")->second != ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
 284                                 reason = "One or more of the channel modes on the remote server are invalid on this server.";
 285                 }
 286
 287                 if (!capab->UserModes.empty())
 288                 {
 289                         if (capab->UserModes != BuildModeList(MODETYPE_USER))
 290                         {
 291                                 std::string diffIneed, diffUneed;
 292                                 ListDifference(capab->UserModes, BuildModeList(MODETYPE_USER), ' ', diffIneed, diffUneed);
 293                                 if (diffIneed.length() || diffUneed.length())
 294                                 {
 295                                         reason = "User modes not matched on these servers.";
 296                                         if (diffIneed.length())
 297                                                 reason += " Not loaded here:" + diffIneed;
 298                                         if (diffUneed.length())
 299                                                 reason += " Not loaded there:" + diffUneed;
 300                                 }
 301                         }
 302                 }
 303                 else if (this->capab->CapKeys.find("USERMODES") != this->capab->CapKeys.end())
 304                 {
 305                         if (this->capab->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MASK_USER))
 306                                 reason = "One or more of the user modes on the remote server are invalid on this server.";
 307                 }
 308
 309                 /* Challenge response, store their challenge for our password */
 310                 std::map<std::string,std::string>::iterator n = this->capab->CapKeys.find("CHALLENGE");
 311                 if (Utils->ChallengeResponse && (n != this->capab->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
 312                 {
 313                         /* Challenge-response is on now */
 314                         this->SetTheirChallenge(n->second);
 315                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 316                         {
 317                                 this->SendCapabilities(2);
 318                                 this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+this->MakePass(capab->OutboundPass, this->GetTheirChallenge())+" 0 "+
 319                                                 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(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+capab->OutboundPass+" 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(proto_version > 1201 ? ' ' : ',');
 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