src/modules/m_spanningtree/compat.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *
   6  * This file is part of InspIRCd.  InspIRCd is free software: you can
   7  * redistribute it and/or modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation, version 2.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  13  * details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include "inspircd.h"
  21 #include "main.h"
  22 #include "treesocket.h"
  23 #include "treeserver.h"
  24
  25 static std::string newline("\n");
  26
  27 void TreeSocket::WriteLine(const std::string& original_line)
  28 {
  29         if (LinkState == CONNECTED)
  30         {
  31                 if (original_line.c_str()[0] != ':')
  32                 {
  33                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Sending line without server prefix!");
  34                         WriteLine(":" + ServerInstance->Config->GetSID() + " " + original_line);
  35                         return;
  36                 }
  37                 if (proto_version != ProtocolVersion)
  38                 {
  39                         std::string line = original_line;
  40                         std::string::size_type a = line.find(' ');
  41                         std::string::size_type b = line.find(' ', a + 1);
  42                         std::string command = line.substr(a + 1, b-a-1);
  43                         // now try to find a translation entry
  44                         // TODO a more efficient lookup method will be needed later
  45                         if (proto_version < 1205)
  46                         {
  47                                 if (command == "IJOIN")
  48                                 {
  49                                         // Convert
  50                                         // :<uid> IJOIN <chan> <membid> [<ts> [<flags>]]
  51                                         // to
  52                                         // :<sid> FJOIN <chan> <ts> + [<flags>],<uuid>
  53                                         std::string::size_type c = line.find(' ', b + 1);
  54                                         if (c == std::string::npos)
  55                                                 return;
  56
  57                                         std::string::size_type d = line.find(' ', c + 1);
  58                                         // Erase membership id first
  59                                         line.erase(c, d-c);
  60                                         if (d == std::string::npos)
  61                                         {
  62                                                 // No TS or modes in the command
  63                                                 // :22DAAAAAB IJOIN #chan
  64                                                 const std::string channame = line.substr(b+1, c-b-1);
  65                                                 Channel* chan = ServerInstance->FindChan(channame);
  66                                                 if (!chan)
  67                                                         return;
  68
  69                                                 line.push_back(' ');
  70                                                 line.append(ConvToStr(chan->age));
  71                                                 line.append(" + ,");
  72                                         }
  73                                         else
  74                                         {
  75                                                 d = line.find(' ', c + 1);
  76                                                 if (d == std::string::npos)
  77                                                 {
  78                                                         // TS present, no modes
  79                                                         // :22DAAAAAC IJOIN #chan 12345
  80                                                         line.append(" + ,");
  81                                                 }
  82                                                 else
  83                                                 {
  84                                                         // Both TS and modes are present
  85                                                         // :22DAAAAAC IJOIN #chan 12345 ov
  86                                                         std::string::size_type e = line.find(' ', d + 1);
  87                                                         if (e != std::string::npos)
  88                                                                 line.erase(e);
  89
  90                                                         line.insert(d, " +");
  91                                                         line.push_back(',');
  92                                                 }
  93                                         }
  94
  95                                         // Move the uuid to the end and replace the I with an F
  96                                         line.append(line.substr(1, 9));
  97                                         line.erase(4, 6);
  98                                         line[5] = 'F';
  99                                 }
 100                                 else if (command == "RESYNC")
 101                                         return;
 102                                 else if (command == "METADATA")
 103                                 {
 104                                         // Drop TS for channel METADATA, translate METADATA operquit into an OPERQUIT command
 105                                         // :sid METADATA #target TS extname ...
 106                                         //     A        B       C  D
 107                                         if (b == std::string::npos)
 108                                                 return;
 109
 110                                         std::string::size_type c = line.find(' ', b + 1);
 111                                         if (c == std::string::npos)
 112                                                 return;
 113
 114                                         std::string::size_type d = line.find(' ', c + 1);
 115                                         if (d == std::string::npos)
 116                                                 return;
 117
 118                                         if (line[b + 1] == '#')
 119                                         {
 120                                                 // We're sending channel metadata
 121                                                 line.erase(c, d-c);
 122                                         }
 123                                         else if (!line.compare(c, d-c, " operquit", 9))
 124                                         {
 125                                                 // ":22D METADATA 22DAAAAAX operquit :message" -> ":22DAAAAAX OPERQUIT :message"
 126                                                 line = ":" + line.substr(b+1, c-b) + "OPERQUIT" + line.substr(d);
 127                                         }
 128                                 }
 129                                 else if (command == "FTOPIC")
 130                                 {
 131                                         // Drop channel TS for FTOPIC
 132                                         // :sid FTOPIC #target TS TopicTS setter :newtopic
 133                                         //     A      B       C  D       E      F
 134                                         // :uid FTOPIC #target TS TopicTS :newtopic
 135                                         //     A      B       C  D       E
 136                                         if (b == std::string::npos)
 137                                                 return;
 138
 139                                         std::string::size_type c = line.find(' ', b + 1);
 140                                         if (c == std::string::npos)
 141                                                 return;
 142
 143                                         std::string::size_type d = line.find(' ', c + 1);
 144                                         if (d == std::string::npos)
 145                                                 return;
 146
 147                                         std::string::size_type e = line.find(' ', d + 1);
 148                                         if (line[e+1] == ':')
 149                                         {
 150                                                 line.erase(c, e-c);
 151                                                 line.erase(a+1, 1);
 152                                         }
 153                                         else
 154                                                 line.erase(c, d-c);
 155                                 }
 156                                 else if ((command == "PING") || (command == "PONG"))
 157                                 {
 158                                         // :22D PING 20D
 159                                         if (line.length() < 13)
 160                                                 return;
 161
 162                                         // Insert the source SID (and a space) between the command and the first parameter
 163                                         line.insert(10, line.substr(1, 4));
 164                                 }
 165                                 else if (command == "OPERTYPE")
 166                                 {
 167                                         std::string::size_type colon = line.find(':', b);
 168                                         if (colon != std::string::npos)
 169                                         {
 170                                                 for (std::string::iterator i = line.begin()+colon; i != line.end(); ++i)
 171                                                 {
 172                                                         if (*i == ' ')
 173                                                                 *i = '_';
 174                                                 }
 175                                                 line.erase(colon, 1);
 176                                         }
 177                                 }
 178                                 else if (command == "INVITE")
 179                                 {
 180                                         // :22D INVITE 22DAAAAAN #chan TS ExpirationTime
 181                                         //     A      B         C     D  E
 182                                         if (b == std::string::npos)
 183                                                 return;
 184
 185                                         std::string::size_type c = line.find(' ', b + 1);
 186                                         if (c == std::string::npos)
 187                                                 return;
 188
 189                                         std::string::size_type d = line.find(' ', c + 1);
 190                                         if (d == std::string::npos)
 191                                                 return;
 192
 193                                         std::string::size_type e = line.find(' ', d + 1);
 194                                         // If there is no expiration time then everything will be erased from 'd'
 195                                         line.erase(d, e-d);
 196                                 }
 197                                 else if (command == "FJOIN")
 198                                 {
 199                                         // Strip membership ids
 200                                         // :22D FJOIN #chan 1234 +f 4:3 :o,22DAAAAAB:15 o,22DAAAAAA:15
 201                                         // :22D FJOIN #chan 1234 +f 4:3 o,22DAAAAAB:15
 202                                         // :22D FJOIN #chan 1234 +Pf 4:3 :
 203
 204                                         // If the last parameter is prefixed by a colon then it's a userlist which may have 0 or more users;
 205                                         // if it isn't, then it is a single member
 206                                         std::string::size_type spcolon = line.find(" :");
 207                                         if (spcolon != std::string::npos)
 208                                         {
 209                                                 spcolon++;
 210                                                 // Loop while there is a ':' in the userlist, this is never true if the channel is empty
 211                                                 std::string::size_type pos = std::string::npos;
 212                                                 while ((pos = line.rfind(':', pos-1)) > spcolon)
 213                                                 {
 214                                                         // Find the next space after the ':'
 215                                                         std::string::size_type sp = line.find(' ', pos);
 216                                                         // Erase characters between the ':' and the next space after it, including the ':' but not the space;
 217                                                         // if there is no next space, everything will be erased between pos and the end of the line
 218                                                         line.erase(pos, sp-pos);
 219                                                 }
 220                                         }
 221                                         else
 222                                         {
 223                                                 // Last parameter is a single member
 224                                                 std::string::size_type sp = line.rfind(' ');
 225                                                 std::string::size_type colon = line.find(':', sp);
 226                                                 line.erase(colon);
 227                                         }
 228                                 }
 229                                 else if (command == "KICK")
 230                                 {
 231                                         // Strip membership id if the KICK has one
 232                                         if (b == std::string::npos)
 233                                                 return;
 234
 235                                         std::string::size_type c = line.find(' ', b + 1);
 236                                         if (c == std::string::npos)
 237                                                 return;
 238
 239                                         std::string::size_type d = line.find(' ', c + 1);
 240                                         if ((d < line.size()-1) && (original_line[d+1] != ':'))
 241                                         {
 242                                                 // There is a third parameter which doesn't begin with a colon, erase it
 243                                                 std::string::size_type e = line.find(' ', d + 1);
 244                                                 line.erase(d, e-d);
 245                                         }
 246                                 }
 247                                 else if (command == "SINFO")
 248                                 {
 249                                         // :22D SINFO version :InspIRCd-2.2
 250                                         //     A     B       C
 251                                         std::string::size_type c = line.find(' ', b + 1);
 252                                         if (c == std::string::npos)
 253                                                 return;
 254
 255                                         // Only translating SINFO version, discard everything else
 256                                         if (line.compare(b, 9, " version ", 9))
 257                                                 return;
 258
 259                                         line = line.substr(0, 5) + "VERSION" + line.substr(c);
 260                                 }
 261                                 else if (command == "SERVER")
 262                                 {
 263                                         // :001 SERVER inspircd.test 002 [<anything> ...] :gecos
 264                                         //     A      B             C
 265                                         std::string::size_type c = line.find(' ', b + 1);
 266                                         if (c == std::string::npos)
 267                                                 return;
 268
 269                                         std::string::size_type d = c + 4;
 270                                         std::string::size_type spcolon = line.find(" :", d);
 271                                         if (spcolon == std::string::npos)
 272                                                 return;
 273
 274                                         line.erase(d, spcolon-d);
 275                                         line.insert(c, " * 0");
 276                                 }
 277                         }
 278                         ServerInstance->Logs->Log(MODNAME, LOG_RAWIO, "S[%d] O %s", this->GetFd(), line.c_str());
 279                         this->WriteData(line);
 280                         this->WriteData(newline);
 281                         return;
 282                 }
 283         }
 284
 285         ServerInstance->Logs->Log(MODNAME, LOG_RAWIO, "S[%d] O %s", this->GetFd(), original_line.c_str());
 286         this->WriteData(original_line);
 287         this->WriteData(newline);
 288 }
 289
 290 namespace
 291 {
 292         bool InsertCurrentChannelTS(std::vector<std::string>& params, unsigned int chanindex = 0, unsigned int pos = 1)
 293         {
 294                 Channel* chan = ServerInstance->FindChan(params[chanindex]);
 295                 if (!chan)
 296                         return false;
 297
 298                 // Insert the current TS of the channel after the pos-th parameter
 299                 params.insert(params.begin()+pos, ConvToStr(chan->age));
 300                 return true;
 301         }
 302 }
 303
 304 bool TreeSocket::PreProcessOldProtocolMessage(User*& who, std::string& cmd, std::vector<std::string>& params)
 305 {
 306         if ((cmd == "METADATA") && (params.size() >= 3) && (params[0][0] == '#'))
 307         {
 308                 // :20D METADATA #channel extname :extdata
 309                 return InsertCurrentChannelTS(params);
 310         }
 311         else if ((cmd == "FTOPIC") && (params.size() >= 4))
 312         {
 313                 // :20D FTOPIC #channel 100 Attila :topic text
 314                 return InsertCurrentChannelTS(params);
 315         }
 316         else if ((cmd == "PING") || (cmd == "PONG"))
 317         {
 318                 if (params.size() == 1)
 319                 {
 320                         // If it's a PING with 1 parameter, reply with a PONG now, if it's a PONG with 1 parameter (weird), do nothing
 321                         if (cmd[1] == 'I')
 322                                 this->WriteData(":" + ServerInstance->Config->GetSID() + " PONG " + params[0] + newline);
 323
 324                         // Don't process this message further
 325                         return false;
 326                 }
 327
 328                 // :20D PING 20D 22D
 329                 // :20D PONG 20D 22D
 330                 // Drop the first parameter
 331                 params.erase(params.begin());
 332
 333                 // If the target is a server name, translate it to a SID
 334                 if (!InspIRCd::IsSID(params[0]))
 335                 {
 336                         TreeServer* server = Utils->FindServer(params[0]);
 337                         if (!server)
 338                         {
 339                                 // We've no idea what this is, log and stop processing
 340                                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Received a " + cmd + " with an unknown target: \"" + params[0] + "\", command dropped");
 341                                 return false;
 342                         }
 343
 344                         params[0] = server->GetID();
 345                 }
 346         }
 347         else if ((cmd == "GLINE") || (cmd == "KLINE") || (cmd == "ELINE") || (cmd == "ZLINE") || (cmd == "QLINE"))
 348         {
 349                 // Fix undocumented protocol usage: translate GLINE, ZLINE, etc. into ADDLINE or DELLINE
 350                 if ((params.size() != 1) && (params.size() != 3))
 351                         return false;
 352
 353                 parameterlist p;
 354                 p.push_back(cmd.substr(0, 1));
 355                 p.push_back(params[0]);
 356
 357                 if (params.size() == 3)
 358                 {
 359                         cmd = "ADDLINE";
 360                         p.push_back(who->nick);
 361                         p.push_back(ConvToStr(ServerInstance->Time()));
 362                         p.push_back(ConvToStr(InspIRCd::Duration(params[1])));
 363                         p.push_back(params[2]);
 364                 }
 365                 else
 366                         cmd = "DELLINE";
 367
 368                 params.swap(p);
 369         }
 370         else if (cmd == "SVSMODE")
 371         {
 372                 cmd = "MODE";
 373         }
 374         else if (cmd == "OPERQUIT")
 375         {
 376                 // Translate OPERQUIT into METADATA
 377                 if (params.empty())
 378                         return false;
 379
 380                 cmd = "METADATA";
 381                 params.insert(params.begin(), who->uuid);
 382                 params.insert(params.begin()+1, "operquit");
 383                 who = MyRoot->ServerUser;
 384         }
 385         else if ((cmd == "TOPIC") && (params.size() >= 2))
 386         {
 387                 // :20DAAAAAC TOPIC #chan :new topic
 388                 cmd = "FTOPIC";
 389                 if (!InsertCurrentChannelTS(params))
 390                         return false;
 391
 392                 params.insert(params.begin()+2, ConvToStr(ServerInstance->Time()));
 393         }
 394         else if (cmd == "MODENOTICE")
 395         {
 396                 // MODENOTICE is always supported by 2.0 but it's optional in 2.2.
 397                 params.insert(params.begin(), "*");
 398                 params.insert(params.begin()+1, cmd);
 399                 cmd = "ENCAP";
 400         }
 401         else if (cmd == "RULES")
 402         {
 403                 return false;
 404         }
 405         else if (cmd == "INVITE")
 406         {
 407                 // :20D INVITE 22DAAABBB #chan
 408                 // :20D INVITE 22DAAABBB #chan 123456789
 409                 // Insert channel timestamp after the channel name; the 3rd parameter, if there, is the invite expiration time
 410                 return InsertCurrentChannelTS(params, 1, 2);
 411         }
 412         else if (cmd == "VERSION")
 413         {
 414                 // :20D VERSION :InspIRCd-2.0
 415                 // change to
 416                 // :20D SINFO version :InspIRCd-2.0
 417                 cmd = "SINFO";
 418                 params.insert(params.begin(), "version");
 419         }
 420         else if (cmd == "JOIN")
 421         {
 422                 // 2.0 allows and forwards legacy JOINs but we don't, so translate them to FJOINs before processing
 423                 if ((params.size() != 1) || (IS_SERVER(who)))
 424                         return false; // Huh?
 425
 426                 cmd = "FJOIN";
 427                 Channel* chan = ServerInstance->FindChan(params[0]);
 428                 params.push_back(ConvToStr(chan ? chan->age : ServerInstance->Time()));
 429                 params.push_back("+");
 430                 params.push_back(",");
 431                 params.back().append(who->uuid);
 432                 who = TreeServer::Get(who)->ServerUser;
 433         }
 434         else if ((cmd == "FMODE") && (params.size() >= 2))
 435         {
 436                 // Translate user mode changes with timestamp to MODE
 437                 if (params[0][0] != '#')
 438                 {
 439                         User* user = ServerInstance->FindUUID(params[0]);
 440                         if (!user)
 441                                 return false;
 442
 443                         // Emulate the old nonsensical behavior
 444                         if (user->age < ServerCommand::ExtractTS(params[1]))
 445                                 return false;
 446
 447                         cmd = "MODE";
 448                         params.erase(params.begin()+1);
 449                 }
 450         }
 451         else if ((cmd == "SERVER") && (params.size() > 4))
 452         {
 453                 // This does not affect the initial SERVER line as it is sent before the link state is CONNECTED
 454                 // :20D SERVER <name> * 0 <sid> <desc>
 455                 // change to
 456                 // :20D SERVER <name> <sid> <desc>
 457
 458                 params[1].swap(params[3]);
 459                 params.erase(params.begin()+2, params.begin()+4);
 460         }
 461
 462         return true; // Passthru
 463 }