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 "link.h"
  21 #include "main.h"
  22
  23 std::string TreeSocket::MyModules(int filter)
  24 {
  25         std::vector<std::string> modlist = ServerInstance->Modules->GetAllModuleNames(filter);
  26
  27         if (filter == VF_COMMON && proto_version != ProtocolVersion)
  28                 CompatAddModules(modlist);
  29
  30         std::string capabilities;
  31         sort(modlist.begin(),modlist.end());
  32         for (unsigned int i = 0; i < modlist.size(); i++)
  33         {
  34                 if (i)
  35                         capabilities.push_back(proto_version > 1201 ? ' ' : ',');
  36                 capabilities.append(modlist[i]);
  37                 Module* m = ServerInstance->Modules->Find(modlist[i]);
  38                 if (m && proto_version > 1201)
  39                 {
  40                         Version v = m->GetVersion();
  41                         if (!v.link_data.empty())
  42                         {
  43                                 capabilities.push_back('=');
  44                                 capabilities.append(v.link_data);
  45                         }
  46                 }
  47         }
  48         return capabilities;
  49 }
  50
  51 static std::string BuildModeList(ModeType type)
  52 {
  53         std::vector<std::string> modes;
  54         for(char c='A'; c <= 'z'; c++)
  55         {
  56                 ModeHandler* mh = ServerInstance->Modes->FindMode(c, type);
  57                 if (mh)
  58                 {
  59                         std::string mdesc = mh->name;
  60                         mdesc.push_back('=');
  61                         if (mh->GetPrefix())
  62                                 mdesc.push_back(mh->GetPrefix());
  63                         if (mh->GetModeChar())
  64                                 mdesc.push_back(mh->GetModeChar());
  65                         modes.push_back(mdesc);
  66                 }
  67         }
  68         sort(modes.begin(), modes.end());
  69         irc::stringjoiner line(" ", modes, 0, modes.size() - 1);
  70         return line.GetJoined();
  71 }
  72
  73 void TreeSocket::SendCapabilities(int phase)
  74 {
  75         if (capab->capab_phase >= phase)
  76                 return;
  77
  78         if (capab->capab_phase < 1 && phase >= 1)
  79                 WriteLine("CAPAB START " + ConvToStr(ProtocolVersion));
  80
  81         capab->capab_phase = phase;
  82         if (phase < 2)
  83                 return;
  84
  85         char sep = proto_version > 1201 ? ' ' : ',';
  86         irc::sepstream modulelist(MyModules(VF_COMMON), sep);
  87         irc::sepstream optmodulelist(MyModules(VF_OPTCOMMON), sep);
  88         /* Send module names, split at 509 length */
  89         std::string item;
  90         std::string line = "CAPAB MODULES :";
  91         while (modulelist.GetToken(item))
  92         {
  93                 if (line.length() + item.length() + 1 > 509)
  94                 {
  95                         this->WriteLine(line);
  96                         line = "CAPAB MODULES :";
  97                 }
  98
  99                 if (line != "CAPAB MODULES :")
 100                         line.push_back(sep);
 101
 102                 line.append(item);
 103         }
 104         if (line != "CAPAB MODULES :")
 105                 this->WriteLine(line);
 106
 107         line = "CAPAB MODSUPPORT :";
 108         while (optmodulelist.GetToken(item))
 109         {
 110                 if (line.length() + item.length() + 1 > 509)
 111                 {
 112                         this->WriteLine(line);
 113                         line = "CAPAB MODSUPPORT :";
 114                 }
 115
 116                 if (line != "CAPAB MODSUPPORT :")
 117                         line.push_back(sep);
 118
 119                 line.append(item);
 120         }
 121         if (line != "CAPAB MODSUPPORT :")
 122                 this->WriteLine(line);
 123
 124         WriteLine("CAPAB CHANMODES :" + BuildModeList(MODETYPE_CHANNEL));
 125         WriteLine("CAPAB USERMODES :" + BuildModeList(MODETYPE_USER));
 126
 127         std::string extra;
 128         /* Do we have sha256 available? If so, we send a challenge */
 129         if (Utils->ChallengeResponse && (ServerInstance->Modules->Find("m_sha256.so")))
 130         {
 131                 SetOurChallenge(ServerInstance->GenRandomStr(20));
 132                 extra = " CHALLENGE=" + this->GetOurChallenge();
 133         }
 134         if (proto_version < 1202)
 135                 extra += ServerInstance->Modes->FindMode('h', MODETYPE_CHANNEL) ? " HALFOP=1" : " HALFOP=0";
 136
 137         this->WriteLine("CAPAB CAPABILITIES " /* Preprocessor does this one. */
 138                         ":NICKMAX="+ConvToStr(ServerInstance->Config->Limits.NickMax)+
 139                         " CHANMAX="+ConvToStr(ServerInstance->Config->Limits.ChanMax)+
 140                         " MAXMODES="+ConvToStr(ServerInstance->Config->Limits.MaxModes)+
 141                         " IDENTMAX="+ConvToStr(ServerInstance->Config->Limits.IdentMax)+
 142                         " MAXQUIT="+ConvToStr(ServerInstance->Config->Limits.MaxQuit)+
 143                         " MAXTOPIC="+ConvToStr(ServerInstance->Config->Limits.MaxTopic)+
 144                         " MAXKICK="+ConvToStr(ServerInstance->Config->Limits.MaxKick)+
 145                         " MAXGECOS="+ConvToStr(ServerInstance->Config->Limits.MaxGecos)+
 146                         " MAXAWAY="+ConvToStr(ServerInstance->Config->Limits.MaxAway)+
 147                         " IP6SUPPORT=1"+
 148                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
 149                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 150                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
 151                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
 152                         " SVSPART=1");
 153
 154         this->WriteLine("CAPAB END");
 155 }
 156
 157 /* Isolate and return the elements that are different between two comma seperated lists */
 158 void TreeSocket::ListDifference(const std::string &one, const std::string &two, char sep,
 159                 std::string& mleft, std::string& mright)
 160 {
 161         std::set<std::string> values;
 162         irc::sepstream sepleft(one, sep);
 163         irc::sepstream sepright(two, sep);
 164         std::string item;
 165         while (sepleft.GetToken(item))
 166         {
 167                 values.insert(item);
 168         }
 169         while (sepright.GetToken(item))
 170         {
 171                 if (!values.erase(item))
 172                 {
 173                         mright.push_back(sep);
 174                         mright.append(item);
 175                 }
 176         }
 177         for(std::set<std::string>::iterator i = values.begin(); i != values.end(); ++i)
 178         {
 179                 mleft.push_back(sep);
 180                 mleft.append(*i);
 181         }
 182 }
 183
 184 bool TreeSocket::Capab(const parameterlist &params)
 185 {
 186         if (params.size() < 1)
 187         {
 188                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 189                 return false;
 190         }
 191         if (params[0] == "START")
 192         {
 193                 capab->ModuleList.clear();
 194                 capab->OptModuleList.clear();
 195                 capab->CapKeys.clear();
 196                 if (params.size() > 1)
 197                         proto_version = atoi(params[1].c_str());
 198                 SendCapabilities(2);
 199         }
 200         else if (params[0] == "END")
 201         {
 202                 std::string reason;
 203                 /* Compare ModuleList and check CapKeys */
 204                 if ((this->capab->ModuleList != this->MyModules(VF_COMMON)) && (this->capab->ModuleList.length()))
 205                 {
 206                         std::string diffIneed, diffUneed;
 207                         ListDifference(this->capab->ModuleList, this->MyModules(VF_COMMON), proto_version > 1201 ? ' ' : ',', diffIneed, diffUneed);
 208                         if (diffIneed.length() || diffUneed.length())
 209                         {
 210                                 reason = "Modules incorrectly matched on these servers.";
 211                                 if (diffIneed.length())
 212                                         reason += " Not loaded here:" + diffIneed;
 213                                 if (diffUneed.length())
 214                                         reason += " Not loaded there:" + diffUneed;
 215                                 this->SendError("CAPAB negotiation failed: "+reason);
 216                                 return false;
 217                         }
 218                 }
 219                 if (this->capab->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->capab->OptModuleList.length())
 220                 {
 221                         std::string diffIneed, diffUneed;
 222                         ListDifference(this->capab->OptModuleList, this->MyModules(VF_OPTCOMMON), ' ', diffIneed, diffUneed);
 223                         if (diffIneed.length() || diffUneed.length())
 224                         {
 225                                 if (Utils->AllowOptCommon)
 226                                 {
 227                                         ServerInstance->SNO->WriteToSnoMask('l',
 228                                                 "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 229                                                 diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 230                                                 diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 231                                 }
 232                                 else
 233                                 {
 234                                         reason = "Optional modules incorrectly matched on these servers, and options::allowmismatch not set.";
 235                                         if (diffIneed.length())
 236                                                 reason += " Not loaded here:" + diffIneed;
 237                                         if (diffUneed.length())
 238                                                 reason += " Not loaded there:" + diffUneed;
 239                                         this->SendError("CAPAB negotiation failed: "+reason);
 240                                         return false;
 241                                 }
 242                         }
 243                 }
 244
 245                 if (this->capab->CapKeys.find("PROTOCOL") == this->capab->CapKeys.end())
 246                 {
 247                         reason = "Protocol version not specified";
 248                 }
 249                 else
 250                 {
 251                         proto_version = atoi(capab->CapKeys.find("PROTOCOL")->second.c_str());
 252                         if (proto_version < MinCompatProtocol)
 253                         {
 254                                 reason = "Server is using protocol version " + ConvToStr(proto_version) +
 255                                         " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 256                                         + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
 257                         }
 258                 }
 259
 260                 if(this->capab->CapKeys.find("PREFIX") != this->capab->CapKeys.end() && this->capab->CapKeys.find("PREFIX")->second != ServerInstance->Modes->BuildPrefixes())
 261                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 262
 263                 if (!capab->ChanModes.empty())
 264                 {
 265                         if (capab->ChanModes != BuildModeList(MODETYPE_CHANNEL))
 266                         {
 267                                 std::string diffIneed, diffUneed;
 268                                 ListDifference(capab->ChanModes, BuildModeList(MODETYPE_CHANNEL), ' ', diffIneed, diffUneed);
 269                                 if (diffIneed.length() || diffUneed.length())
 270                                 {
 271                                         reason = "Channel modes not matched on these servers.";
 272                                         if (diffIneed.length())
 273                                                 reason += " Not loaded here:" + diffIneed;
 274                                         if (diffUneed.length())
 275                                                 reason += " Not loaded there:" + diffUneed;
 276                                 }
 277                         }
 278                 }
 279                 else if (this->capab->CapKeys.find("CHANMODES") != this->capab->CapKeys.end())
 280                 {
 281                         if (this->capab->CapKeys.find("CHANMODES")->second != ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
 282                                 reason = "One or more of the channel modes on the remote server are invalid on this server.";
 283                 }
 284
 285                 if (!capab->UserModes.empty())
 286                 {
 287                         if (capab->UserModes != BuildModeList(MODETYPE_USER))
 288                         {
 289                                 std::string diffIneed, diffUneed;
 290                                 ListDifference(capab->UserModes, BuildModeList(MODETYPE_USER), ' ', diffIneed, diffUneed);
 291                                 if (diffIneed.length() || diffUneed.length())
 292                                 {
 293                                         reason = "User modes not matched on these servers.";
 294                                         if (diffIneed.length())
 295                                                 reason += " Not loaded here:" + diffIneed;
 296                                         if (diffUneed.length())
 297                                                 reason += " Not loaded there:" + diffUneed;
 298                                 }
 299                         }
 300                 }
 301                 else if (this->capab->CapKeys.find("USERMODES") != this->capab->CapKeys.end())
 302                 {
 303                         if (this->capab->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MASK_USER))
 304                                 reason = "One or more of the user modes on the remote server are invalid on this server.";
 305                 }
 306
 307                 /* Challenge response, store their challenge for our password */
 308                 std::map<std::string,std::string>::iterator n = this->capab->CapKeys.find("CHALLENGE");
 309                 if (Utils->ChallengeResponse && (n != this->capab->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
 310                 {
 311                         /* Challenge-response is on now */
 312                         this->SetTheirChallenge(n->second);
 313                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 314                         {
 315                                 this->SendCapabilities(2);
 316                                 this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+this->MakePass(capab->link->SendPass, capab->theirchallenge)+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 317                         }
 318                 }
 319                 else
 320                 {
 321                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 322                         if (this->LinkState == CONNECTING)
 323                         {
 324                                 this->SendCapabilities(2);
 325                                 this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+capab->link->SendPass+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 326                         }
 327                 }
 328
 329                 if (reason.length())
 330                 {
 331                         this->SendError("CAPAB negotiation failed: "+reason);
 332                         return false;
 333                 }
 334         }
 335         else if ((params[0] == "MODULES") && (params.size() == 2))
 336         {
 337                 if (!capab->ModuleList.length())
 338                 {
 339                         capab->ModuleList = params[1];
 340                 }
 341                 else
 342                 {
 343                         capab->ModuleList.push_back(proto_version > 1201 ? ' ' : ',');
 344                         capab->ModuleList.append(params[1]);
 345                 }
 346         }
 347         else if ((params[0] == "MODSUPPORT") && (params.size() == 2))
 348         {
 349                 if (!capab->OptModuleList.length())
 350                 {
 351                         capab->OptModuleList = params[1];
 352                 }
 353                 else
 354                 {
 355                         capab->OptModuleList.push_back(' ');
 356                         capab->OptModuleList.append(params[1]);
 357                 }
 358         }
 359         else if ((params[0] == "CHANMODES") && (params.size() == 2))
 360         {
 361                 capab->ChanModes = params[1];
 362         }
 363         else if ((params[0] == "USERMODES") && (params.size() == 2))
 364         {
 365                 capab->UserModes = params[1];
 366         }
 367         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 368         {
 369                 irc::tokenstream capabs(params[1]);
 370                 std::string item;
 371                 while (capabs.GetToken(item))
 372                 {
 373                         /* Process each key/value pair */
 374                         std::string::size_type equals = item.find('=');
 375                         if (equals != std::string::npos)
 376                         {
 377                                 std::string var = item.substr(0, equals);
 378                                 std::string value = item.substr(equals+1, item.length());
 379                                 capab->CapKeys[var] = value;
 380                         }
 381                 }
 382         }
 383         return true;
 384 }
 385