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 /* $ModDep: m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/treesocket.h */
  23
  24 std::string TreeSocket::MyModules(int filter)
  25 {
  26         std::vector<std::string> modlist = ServerInstance->Modules->GetAllModuleNames(filter);
  27
  28         if (filter == VF_COMMON && proto_version != ProtocolVersion)
  29                 CompatAddModules(modlist);
  30
  31         std::string capabilities;
  32         sort(modlist.begin(),modlist.end());
  33         for (unsigned int i = 0; i < modlist.size(); i++)
  34         {
  35                 if (i)
  36                         capabilities.push_back(',');
  37                 capabilities.append(modlist[i]);
  38                 Module* m = ServerInstance->Modules->Find(modlist[i]);
  39                 if (m && proto_version >= 1202)
  40                 {
  41                         Version v = m->GetVersion();
  42                         if (!v.link_data.empty())
  43                         {
  44                                 capabilities.push_back('=');
  45                                 capabilities.append(v.link_data);
  46                         }
  47                 }
  48         }
  49         return capabilities;
  50 }
  51
  52 static std::string BuildModeList(ModeType type)
  53 {
  54         std::string line;
  55         for(char c='A'; c <= 'z'; c++)
  56         {
  57                 ModeHandler* mh = ServerInstance->Modes->FindMode(c, type);
  58                 if (mh)
  59                 {
  60                         if (!line.empty())
  61                                 line.push_back(',');
  62                         line.append(mh->name);
  63                         line.push_back('=');
  64                         line.push_back(c);
  65                 }
  66         }
  67         return line;
  68 }
  69
  70 void TreeSocket::SendCapabilities(int phase)
  71 {
  72         if (capab->capab_phase >= phase)
  73                 return;
  74
  75         if (capab->capab_phase < 1 && phase >= 1)
  76                 WriteLine("CAPAB START " + ConvToStr(ProtocolVersion));
  77
  78         capab->capab_phase = phase;
  79         if (phase < 2)
  80                 return;
  81
  82         irc::commasepstream modulelist(MyModules(VF_COMMON));
  83         irc::commasepstream optmodulelist(MyModules(VF_OPTCOMMON));
  84         /* Send module names, split at 509 length */
  85         std::string item;
  86         std::string line = "CAPAB MODULES ";
  87         while (modulelist.GetToken(item))
  88         {
  89                 if (line.length() + item.length() + 1 > 509)
  90                 {
  91                         this->WriteLine(line);
  92                         line = "CAPAB MODULES ";
  93                 }
  94
  95                 if (line != "CAPAB MODULES ")
  96                         line.append(",");
  97
  98                 line.append(item);
  99         }
 100         if (line != "CAPAB MODULES ")
 101                 this->WriteLine(line);
 102
 103         line = "CAPAB MODSUPPORT ";
 104         while (optmodulelist.GetToken(item))
 105         {
 106                 if (line.length() + item.length() + 1 > 509)
 107                 {
 108                         this->WriteLine(line);
 109                         line = "CAPAB MODSUPPORT ";
 110                 }
 111
 112                 if (line != "CAPAB MODSUPPORT ")
 113                         line.append(",");
 114
 115                 line.append(item);
 116         }
 117         if (line != "CAPAB MODSUPPORT ")
 118                 this->WriteLine(line);
 119
 120         line = "CAPAB CHANMODES " + BuildModeList(MODETYPE_CHANNEL);
 121         if (line != "CAPAB CHANMODES ")
 122                 this->WriteLine(line);
 123
 124         line = "CAPAB USERMODES " + BuildModeList(MODETYPE_USER);
 125         if (line != "CAPAB USERMODES ")
 126                 this->WriteLine(line);
 127
 128         int ip6 = 0;
 129 #ifdef IPV6
 130         ip6 = 1;
 131 #endif
 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                 this->SetOurChallenge(RandString(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                         " IP6NATIVE="+ConvToStr(ip6)+
 151                         " IP6SUPPORT=1"+
 152                         " PROTOCOL="+ConvToStr(ProtocolVersion)+extra+
 153                         " PREFIX="+ServerInstance->Modes->BuildPrefixes()+
 154                         " CHANMODES="+ServerInstance->Modes->GiveModeList(MASK_CHANNEL)+
 155                         " USERMODES="+ServerInstance->Modes->GiveModeList(MASK_USER)+
 156                         " SVSPART=1");
 157
 158         this->WriteLine("CAPAB END");
 159 }
 160
 161 /* Check a comma seperated list for an item */
 162 bool TreeSocket::HasItem(const std::string &list, const std::string &item)
 163 {
 164         irc::commasepstream seplist(list);
 165         std::string item2;
 166
 167         while (seplist.GetToken(item2))
 168         {
 169                 if (item2 == item)
 170                         return true;
 171         }
 172         return false;
 173 }
 174
 175 /* Isolate and return the elements that are different between two comma seperated lists */
 176 std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
 177 {
 178         irc::commasepstream list_one(one);
 179         std::string item;
 180         std::string result;
 181         while (list_one.GetToken(item))
 182         {
 183                 if (!HasItem(two, item))
 184                 {
 185                         result.append(" ");
 186                         result.append(item);
 187                 }
 188         }
 189         return result;
 190 }
 191
 192 bool TreeSocket::Capab(const parameterlist &params)
 193 {
 194         if (params.size() < 1)
 195         {
 196                 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
 197                 return false;
 198         }
 199         if (params[0] == "START")
 200         {
 201                 capab->ModuleList.clear();
 202                 capab->OptModuleList.clear();
 203                 capab->CapKeys.clear();
 204                 if (params.size() > 1)
 205                         proto_version = atoi(params[1].c_str());
 206                 SendCapabilities(2);
 207         }
 208         else if (params[0] == "END")
 209         {
 210                 std::string reason;
 211                 /* Compare ModuleList and check CapKeys */
 212                 if ((this->capab->ModuleList != this->MyModules(VF_COMMON)) && (this->capab->ModuleList.length()))
 213                 {
 214                         std::string diffIneed = ListDifference(this->capab->ModuleList, this->MyModules(VF_COMMON));
 215                         std::string diffUneed = ListDifference(this->MyModules(VF_COMMON), this->capab->ModuleList);
 216                         if (diffIneed.length() == 0 && diffUneed.length() == 0)
 217                         {
 218                                 reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 219                         }
 220                         else
 221                         {
 222                                 reason = "Modules incorrectly matched on these servers.";
 223                                 if (diffIneed.length())
 224                                         reason += " Not loaded here:" + diffIneed;
 225                                 if (diffUneed.length())
 226                                         reason += " Not loaded there:" + diffUneed;
 227                         }
 228                         this->SendError("CAPAB negotiation failed: "+reason);
 229                         return false;
 230                 }
 231                 if (this->capab->OptModuleList != this->MyModules(VF_OPTCOMMON) && this->capab->OptModuleList.length())
 232                 {
 233                         std::string diffIneed = ListDifference(this->capab->OptModuleList, this->MyModules(VF_OPTCOMMON));
 234                         std::string diffUneed = ListDifference(this->MyModules(VF_OPTCOMMON), this->capab->OptModuleList);
 235                         if (diffIneed.length() == 0 && diffUneed.length() == 0)
 236                         {
 237                                 reason = "Optional Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 238                         }
 239                         else if (Utils->AllowOptCommon)
 240                         {
 241                                 ServerInstance->SNO->WriteToSnoMask('l',
 242                                         "Optional module lists do not match, some commands may not work globally.%s%s%s%s",
 243                                         diffIneed.length() ? " Not loaded here:" : "", diffIneed.c_str(),
 244                                         diffUneed.length() ? " Not loaded there:" : "", diffUneed.c_str());
 245                         }
 246                         else
 247                         {
 248                                 reason = "Optional modules incorrectly matched on these servers, and options::allowmismatch not set.";
 249                                 if (diffIneed.length())
 250                                         reason += " Not loaded here:" + diffIneed;
 251                                 if (diffUneed.length())
 252                                         reason += " Not loaded there:" + diffUneed;
 253                                 this->SendError("CAPAB negotiation failed: "+reason);
 254                                 return false;
 255                         }
 256                 }
 257
 258                 if (this->capab->CapKeys.find("PROTOCOL") == this->capab->CapKeys.end())
 259                 {
 260                         reason = "Protocol version not specified";
 261                 }
 262                 else
 263                 {
 264                         proto_version = atoi(capab->CapKeys.find("PROTOCOL")->second.c_str());
 265                         if (proto_version < MinCompatProtocol)
 266                         {
 267                                 reason = "Server is using protocol version " + ConvToStr(proto_version) +
 268                                         " which is too old to link with this server (version " + ConvToStr(ProtocolVersion)
 269                                         + (ProtocolVersion != MinCompatProtocol ? ", links with " + ConvToStr(MinCompatProtocol) + " and above)" : ")");
 270                         }
 271                 }
 272
 273                 if(this->capab->CapKeys.find("PREFIX") != this->capab->CapKeys.end() && this->capab->CapKeys.find("PREFIX")->second != ServerInstance->Modes->BuildPrefixes())
 274                         reason = "One or more of the prefixes on the remote server are invalid on this server.";
 275
 276                 if (!capab->ChanModes.empty())
 277                 {
 278                         if (capab->ChanModes != BuildModeList(MODETYPE_CHANNEL))
 279                         {
 280                                 std::string diffIneed = ListDifference(capab->ChanModes, BuildModeList(MODETYPE_CHANNEL));
 281                                 std::string diffUneed = ListDifference(BuildModeList(MODETYPE_CHANNEL), capab->ChanModes);
 282                                 reason = "Channel modes not matched on these servers.";
 283                                 if (diffIneed.length())
 284                                         reason += " Not loaded here:" + diffIneed;
 285                                 if (diffUneed.length())
 286                                         reason += " Not loaded there:" + diffUneed;
 287                         }
 288                 }
 289                 else if (this->capab->CapKeys.find("CHANMODES") != this->capab->CapKeys.end())
 290                 {
 291                         if (this->capab->CapKeys.find("CHANMODES")->second != ServerInstance->Modes->GiveModeList(MASK_CHANNEL))
 292                                 reason = "One or more of the channel modes on the remote server are invalid on this server.";
 293                 }
 294
 295                 if (!capab->UserModes.empty())
 296                 {
 297                         if (capab->UserModes != BuildModeList(MODETYPE_USER))
 298                         {
 299                                 std::string diffIneed = ListDifference(capab->UserModes, BuildModeList(MODETYPE_USER));
 300                                 std::string diffUneed = ListDifference(BuildModeList(MODETYPE_USER), capab->UserModes);
 301                                 reason = "User modes not matched on these servers.";
 302                                 if (diffIneed.length())
 303                                         reason += " Not loaded here:" + diffIneed;
 304                                 if (diffUneed.length())
 305                                         reason += " Not loaded there:" + diffUneed;
 306                         }
 307                 }
 308                 else if (this->capab->CapKeys.find("USERMODES") != this->capab->CapKeys.end())
 309                 {
 310                         if (this->capab->CapKeys.find("USERMODES")->second != ServerInstance->Modes->GiveModeList(MASK_USER))
 311                                 reason = "One or more of the user modes on the remote server are invalid on this server.";
 312                 }
 313
 314                 /* Challenge response, store their challenge for our password */
 315                 std::map<std::string,std::string>::iterator n = this->capab->CapKeys.find("CHALLENGE");
 316                 if (Utils->ChallengeResponse && (n != this->capab->CapKeys.end()) && (ServerInstance->Modules->Find("m_sha256.so")))
 317                 {
 318                         /* Challenge-response is on now */
 319                         this->SetTheirChallenge(n->second);
 320                         if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
 321                         {
 322                                 this->SendCapabilities(2);
 323                                 this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+this->MakePass(capab->OutboundPass, this->GetTheirChallenge())+" 0 "+
 324                                                 ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 325                         }
 326                 }
 327                 else
 328                 {
 329                         /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
 330                         if (this->LinkState == CONNECTING)
 331                         {
 332                                 this->SendCapabilities(2);
 333                                 this->WriteLine(std::string("SERVER ")+ServerInstance->Config->ServerName+" "+capab->OutboundPass+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);
 334                         }
 335                 }
 336
 337                 if (reason.length())
 338                 {
 339                         this->SendError("CAPAB negotiation failed: "+reason);
 340                         return false;
 341                 }
 342         }
 343         else if ((params[0] == "MODULES") && (params.size() == 2))
 344         {
 345                 if (!this->capab->ModuleList.length())
 346                 {
 347                         this->capab->ModuleList.append(params[1]);
 348                 }
 349                 else
 350                 {
 351                         this->capab->ModuleList.append(",");
 352                         this->capab->ModuleList.append(params[1]);
 353                 }
 354         }
 355         else if ((params[0] == "MODSUPPORT") && (params.size() == 2))
 356         {
 357                 if (!this->capab->OptModuleList.length())
 358                 {
 359                         this->capab->OptModuleList.append(params[1]);
 360                 }
 361                 else
 362                 {
 363                         this->capab->OptModuleList.append(",");
 364                         this->capab->OptModuleList.append(params[1]);
 365                 }
 366         }
 367         else if ((params[0] == "CHANMODES") && (params.size() == 2))
 368         {
 369                 capab->ChanModes = params[1];
 370         }
 371         else if ((params[0] == "USERMODES") && (params.size() == 2))
 372         {
 373                 capab->UserModes = params[1];
 374         }
 375         else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
 376         {
 377                 irc::tokenstream capabs(params[1]);
 378                 std::string item;
 379                 bool more = true;
 380                 while ((more = capabs.GetToken(item)))
 381                 {
 382                         /* Process each key/value pair */
 383                         std::string::size_type equals = item.rfind('=');
 384                         if (equals != std::string::npos)
 385                         {
 386                                 std::string var = item.substr(0, equals);
 387                                 std::string value = item.substr(equals+1, item.length());
 388                                 capab->CapKeys[var] = value;
 389                         }
 390                 }
 391         }
 392         return true;
 393 }
 394