src/ngircd/irc-channel.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  *
  11  * IRC channel commands
  12  */
  13
  14
  15 #include "portab.h"
  16
  17 static char UNUSED id[] = "$Id: irc-channel.c,v 1.42 2008/02/05 13:31:50 fw Exp $";
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "client.h"
  28 #include "channel.h"
  29 #include "lists.h"
  30 #include "log.h"
  31 #include "match.h"
  32 #include "messages.h"
  33 #include "parse.h"
  34 #include "irc-info.h"
  35 #include "irc-write.h"
  36 #include "resolve.h"
  37 #include "conf.h"
  38
  39 #include "exp.h"
  40 #include "irc-channel.h"
  41
  42
  43 /*
  44  * RFC 2812, (3.2.1 Join message Command):
  45  *  Note that this message
  46  *  accepts a special argument ("0"), which is a special request to leave all
  47  *  channels the user is currently a member of. The server will process this
  48  *  message as if the user had sent a PART command (See Section 3.2.2) for
  49  *  each channel he is a member of.
  50  */
  51 static bool
  52 part_from_all_channels(CLIENT* client, CLIENT *target)
  53 {
  54         CL2CHAN *cl2chan = Channel_FirstChannelOf(target);
  55         CHANNEL *chan;
  56
  57         while (cl2chan) {
  58                 chan = Channel_GetChannel(cl2chan);
  59                 assert( chan != NULL );
  60                 Channel_Part(target, client, Channel_Name(chan), Client_ID(target));
  61
  62                 /* next */
  63                 cl2chan = Channel_FirstChannelOf(target);
  64         }
  65         return CONNECTED;
  66 }
  67
  68
  69 GLOBAL bool
  70 IRC_JOIN( CLIENT *Client, REQUEST *Req )
  71 {
  72         char *channame, *channame_ptr, *key, *key_ptr, *flags, *topic, modes[8];
  73         bool is_new_chan, is_invited, is_banned;
  74         CLIENT *target;
  75         CHANNEL *chan;
  76
  77         assert( Client != NULL );
  78         assert( Req != NULL );
  79
  80         /* Bad number of arguments? */
  81         if (Req->argc < 1 || Req->argc > 2)
  82                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  83                                           Client_ID(Client), Req->command);
  84
  85         /* Who is the sender? */
  86         if( Client_Type( Client ) == CLIENT_SERVER ) target = Client_Search( Req->prefix );
  87         else target = Client;
  88         if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
  89
  90         /* Is argument "0"? */
  91         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
  92                 return part_from_all_channels(Client, target);
  93
  94         /* Are channel keys given? */
  95         if (Req->argc > 1) {
  96                 key = Req->argv[1];
  97                 key_ptr = strchr(key, ',');
  98                 if (key_ptr) *key_ptr = '\0';
  99         }
 100         else
 101                 key = key_ptr = NULL;
 102
 103         channame = Req->argv[0];
 104         channame_ptr = strchr(channame, ',');
 105         if (channame_ptr) *channame_ptr = '\0';
 106
 107         /* Channel-Namen durchgehen */
 108         while (channame)
 109         {
 110                 chan = NULL; flags = NULL;
 111
 112                 /* wird der Channel neu angelegt? */
 113                 if( Channel_Search( channame )) {
 114                         is_new_chan = false;
 115                 } else {
 116                         if (Conf_PredefChannelsOnly) { /* this server does not allow creation of channels */
 117                                 IRC_WriteStrClient( Client, ERR_BANNEDFROMCHAN_MSG, Client_ID( Client ), channame );
 118                                 /* Try next name, if any */
 119                                 channame = strchr(channame, ',');
 120                                 continue;
 121                         }
 122                         is_new_chan = true;
 123                 }
 124
 125                 /* Hat ein Server Channel-User-Modes uebergeben? */
 126                 if( Client_Type( Client ) == CLIENT_SERVER )
 127                 {
 128                         /* Channel-Flags extrahieren */
 129                         flags = strchr( channame, 0x7 );
 130                         if( flags )
 131                         {
 132                                 *flags = '\0';
 133                                 flags++;
 134                         }
 135                 }
 136
 137                 /* Local client? */
 138                 if( Client_Type( Client ) == CLIENT_USER )
 139                 {
 140                         /* Test if the user has reached his maximum channel count */
 141                         if(( Conf_MaxJoins > 0 ) && ( Channel_CountForUser( Client ) >= Conf_MaxJoins ))
 142                                 return IRC_WriteStrClient( Client, ERR_TOOMANYCHANNELS_MSG,
 143                                                         Client_ID( Client ), channame );
 144
 145                         /* Existiert der Channel bereits, oder wird er im Moment neu erzeugt? */
 146                         if( is_new_chan )
 147                         {
 148                                 /* Erster User im Channel: Operator-Flag setzen */
 149                                 flags = "o";
 150                         }
 151                         else
 152                         {
 153                                 /* Existierenden Channel suchen */
 154                                 chan = Channel_Search( channame );
 155                                 assert( chan != NULL );
 156
 157                                 is_banned = Lists_Check(Channel_GetListBans(chan), target );
 158                                 is_invited = Lists_Check(Channel_GetListInvites(chan), target );
 159
 160                                 /* Testen, ob Client gebanned ist */
 161                                 if(( is_banned == true) &&  ( is_invited == false ))
 162                                 {
 163                                         /* Client ist gebanned (und nicht invited): */
 164                                         IRC_WriteStrClient( Client, ERR_BANNEDFROMCHAN_MSG, Client_ID( Client ), channame );
 165
 166                                         /* Try next name, if any */
 167                                         channame = strchr(channame, ',');
 168                                         continue;
 169                                 }
 170
 171                                 /* Ist der Channel "invite-only"? */
 172                                 if(( strchr( Channel_Modes( chan ), 'i' )) && ( is_invited == false ))
 173                                 {
 174                                         /* Channel ist "invite-only" und Client wurde nicht invited: */
 175                                         IRC_WriteStrClient( Client, ERR_INVITEONLYCHAN_MSG, Client_ID( Client ), channame );
 176
 177                                         /* Try next name, if any */
 178                                         channame = strchr(channame, ',');
 179                                         continue;
 180                                 }
 181
 182                                 /* Is the channel protected by a key? */
 183                                 if(( strchr( Channel_Modes( chan ), 'k' )) && ( strcmp( Channel_Key( chan ), key ? key : "" ) != 0 ))
 184                                 {
 185                                         /* Bad channel key! */
 186                                         IRC_WriteStrClient( Client, ERR_BADCHANNELKEY_MSG, Client_ID( Client ), channame );
 187
 188                                         /* Try next name, if any */
 189                                         channame = strchr(channame, ',');
 190                                         continue;
 191                                 }
 192
 193                                 /* Are there already too many members? */
 194                                 if(( strchr( Channel_Modes( chan ), 'l' )) && ( Channel_MaxUsers( chan ) <= Channel_MemberCount( chan )))
 195                                 {
 196                                         /* Bad channel key! */
 197                                         IRC_WriteStrClient( Client, ERR_CHANNELISFULL_MSG, Client_ID( Client ), channame );
 198
 199                                         /* Try next name, if any */
 200                                         channame = strchr(channame, ',');
 201                                         continue;
 202                                 }
 203                         }
 204                 }
 205                 else
 206                 {
 207                         /* Remote server: we don't need to know whether the
 208                          * client is invited or not, but we have to make sure
 209                          * that the "one shot" entries (generated by INVITE
 210                          * commands) in this list become deleted when a user
 211                          * joins a channel this way. */
 212                         chan = Channel_Search( channame );
 213                         if( chan != NULL ) (void)Lists_Check(Channel_GetListInvites(chan), target);
 214                 }
 215
 216                 /* Channel joinen (und ggf. anlegen) */
 217                 if( ! Channel_Join( target, channame ))
 218                 {
 219                         /* naechsten Namen ermitteln */
 220                         channame = strchr(channame, ',');
 221                         continue;
 222                 }
 223                 if( ! chan ) chan = Channel_Search( channame );
 224                 assert( chan != NULL );
 225
 226                 /* Modes setzen (wenn vorhanden) */
 227                 while( flags && *flags )
 228                 {
 229                         Channel_UserModeAdd( chan, target, *flags );
 230                         flags++;
 231                 }
 232
 233                 /* Wenn persistenter Channel und IRC-Operator: zum Channel-OP machen */
 234                 if(( strchr( Channel_Modes( chan ), 'P' )) && ( strchr( Client_Modes( target ), 'o' ))) Channel_UserModeAdd( chan, target, 'o' );
 235
 236                 /* Muessen Modes an andere Server gemeldet werden? */
 237                 strlcpy( &modes[1], Channel_UserModes( chan, target ), sizeof( modes ) - 1 );
 238                 if( modes[1] ) modes[0] = 0x7;
 239                 else modes[0] = '\0';
 240
 241                 /* An andere Server weiterleiten */
 242                 IRC_WriteStrServersPrefix( Client, target, "JOIN :%s%s", channame, modes );
 243
 244                 /* im Channel bekannt machen */
 245                 IRC_WriteStrChannelPrefix( Client, chan, target, false, "JOIN :%s", channame );
 246                 if( modes[1] )
 247                 {
 248                         /* Modes im Channel bekannt machen */
 249                         IRC_WriteStrChannelPrefix( Client, chan, target, false, "MODE %s +%s %s", channame, &modes[1], Client_ID( target ));
 250                 }
 251
 252                 if( Client_Type( Client ) == CLIENT_USER )
 253                 {
 254                         /* an Client bestaetigen */
 255                         IRC_WriteStrClientPrefix( Client, target, "JOIN :%s", channame );
 256
 257                         /* Send topic to client, if any */
 258                         topic = Channel_Topic(chan);
 259                         if (*topic) {
 260                                 IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 261                                         Client_ID(Client), channame, topic);
 262 #ifndef STRICT_RFC
 263                                 IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 264                                         Client_ID(Client), channame,
 265                                         Channel_TopicWho(chan),
 266                                         Channel_TopicTime(chan));
 267 #endif
 268                         }
 269
 270                         /* Mitglieder an Client Melden */
 271                         IRC_Send_NAMES( Client, chan );
 272                         IRC_WriteStrClient( Client, RPL_ENDOFNAMES_MSG, Client_ID( Client ), Channel_Name( chan ));
 273                 }
 274
 275                 /* next channel? */
 276                 channame = channame_ptr;
 277                 if (channame) {
 278                         channame++;
 279                         channame_ptr = strchr(channame, ',');
 280                         if (channame_ptr) *channame_ptr = '\0';
 281
 282                         if (key_ptr) {
 283                                 key = ++key_ptr;
 284                                 key_ptr = strchr(key, ',');
 285                                 if (key_ptr) *key_ptr = '\0';
 286                         }
 287                 }
 288         }
 289         return CONNECTED;
 290 } /* IRC_JOIN */
 291
 292
 293 GLOBAL bool
 294 IRC_PART( CLIENT *Client, REQUEST *Req )
 295 {
 296         CLIENT *target;
 297         char *chan;
 298
 299         assert( Client != NULL );
 300         assert( Req != NULL );
 301
 302         if (Req->argc < 1 || Req->argc > 2)
 303                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 304                                         Client_ID(Client), Req->command);
 305
 306         /* Wer ist der Absender? */
 307         if( Client_Type( Client ) == CLIENT_SERVER ) target = Client_Search( Req->prefix );
 308         else target = Client;
 309         if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 310
 311         /* Channel-Namen durchgehen */
 312         chan = strtok(Req->argv[0], ",");
 313         while (chan) {
 314                 Channel_Part(target, Client, chan, Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 315
 316                 chan = strtok(NULL, ",");
 317         }
 318         return CONNECTED;
 319 } /* IRC_PART */
 320
 321
 322 GLOBAL bool
 323 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 324 {
 325         CHANNEL *chan;
 326         CLIENT *from;
 327         char *topic;
 328         bool r;
 329
 330         assert( Client != NULL );
 331         assert( Req != NULL );
 332
 333         /* Falsche Anzahl Parameter? */
 334         if(( Req->argc < 1 ) || ( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 335
 336         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 337         else from = Client;
 338         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 339
 340         /* Welcher Channel? */
 341         chan = Channel_Search( Req->argv[0] );
 342         if( ! chan ) return IRC_WriteStrClient( from, ERR_NOSUCHCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
 343
 344         /* Ist der User Mitglied in dem Channel? */
 345         if( ! Channel_IsMemberOf( chan, from )) return IRC_WriteStrClient( from, ERR_NOTONCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
 346
 347         if( Req->argc == 1 )
 348         {
 349                 /* Request actual topic */
 350                 topic = Channel_Topic(chan);
 351                 if (*topic) {
 352                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 353                                 Client_ID(Client), Channel_Name(chan), topic);
 354 #ifndef STRICT_RFC
 355                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 356                                 Client_ID(Client), Channel_Name(chan),
 357                                 Channel_TopicWho(chan),
 358                                 Channel_TopicTime(chan));
 359 #endif
 360                         return r;
 361                 }
 362                 else
 363                          return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 364                                         Client_ID(from), Channel_Name(chan));
 365         }
 366
 367         if( strchr( Channel_Modes( chan ), 't' ))
 368         {
 369                 /* Topic Lock. Ist der User ein Channel Operator? */
 370                 if( ! strchr( Channel_UserModes( chan, from ), 'o' )) return IRC_WriteStrClient( from, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( from ), Channel_Name( chan ));
 371         }
 372
 373         /* Set new topic */
 374         Channel_SetTopic(chan, from, Req->argv[1]);
 375         Log(LOG_DEBUG, "User \"%s\" set topic on \"%s\": %s",
 376                 Client_Mask(from), Channel_Name(chan),
 377                 Req->argv[1][0] ? Req->argv[1] : "<none>");
 378
 379         /* im Channel bekannt machen und an Server weiterleiten */
 380         IRC_WriteStrServersPrefix( Client, from, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 381         IRC_WriteStrChannelPrefix( Client, chan, from, false, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 382
 383         if( Client_Type( Client ) == CLIENT_USER ) return IRC_WriteStrClientPrefix( Client, Client, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 384         else return CONNECTED;
 385 } /* IRC_TOPIC */
 386
 387
 388 /**
 389  * Handler for the IRC "LIST" command.
 390  * This implementation handles the local case as well as the forwarding of the
 391  * LIST command to other servers in the IRC network.
 392  */
 393 GLOBAL bool
 394 IRC_LIST( CLIENT *Client, REQUEST *Req )
 395 {
 396         char *pattern;
 397         CHANNEL *chan;
 398         CLIENT *from, *target;
 399
 400         assert( Client != NULL );
 401         assert( Req != NULL );
 402
 403         /* Bad number of prameters? */
 404         if( Req->argc > 2 )
 405                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 406                         Client_ID( Client ), Req->command );
 407
 408         if( Req->argc > 0 )
 409                 pattern = strtok( Req->argv[0], "," );
 410         else
 411                 pattern = "*";
 412
 413         /* Get sender from prefix, if any */
 414         if( Client_Type( Client ) == CLIENT_SERVER )
 415                 from = Client_Search( Req->prefix );
 416         else
 417                 from = Client;
 418
 419         if( ! from )
 420                 return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG,
 421                                 Client_ID( Client ), Req->prefix );
 422
 423         if( Req->argc == 2 )
 424         {
 425                 /* Forward to other server? */
 426                 target = Client_Search( Req->argv[1] );
 427                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
 428                         return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG,
 429                                         Client_ID( Client ), Req->argv[1] );
 430
 431                 if( target != Client_ThisServer( ))
 432                 {
 433                         /* Target is indeed an other server, forward it! */
 434                         return IRC_WriteStrClientPrefix( target, from,
 435                                         "LIST %s :%s", Client_ID( from ),
 436                                         Req->argv[1] );
 437                 }
 438         }
 439
 440         while( pattern )
 441         {
 442                 /* Loop through all the channels */
 443                 chan = Channel_First( );
 444                 while( chan )
 445                 {
 446                         /* Check search pattern */
 447                         if( Match( pattern, Channel_Name( chan )))
 448                         {
 449                                 /* Gotcha! */
 450                                 if( ! strchr( Channel_Modes( chan ), 's' ) ||
 451                                     Channel_IsMemberOf( chan, from ))
 452                                 {
 453                                         if( ! IRC_WriteStrClient( from,
 454                                             RPL_LIST_MSG, Client_ID( from ),
 455                                             Channel_Name( chan ),
 456                                             Channel_MemberCount( chan ),
 457                                             Channel_Topic( chan )))
 458                                                 return DISCONNECTED;
 459                                 }
 460                         }
 461                         chan = Channel_Next( chan );
 462                 }
 463
 464                 /* Get next name ... */
 465                 if( Req->argc > 0 )
 466                         pattern = strtok( NULL, "," );
 467                 else
 468                         pattern = NULL;
 469         }
 470
 471         return IRC_WriteStrClient( from, RPL_LISTEND_MSG, Client_ID( from ));
 472 } /* IRC_LIST */
 473
 474
 475 GLOBAL bool
 476 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 477 {
 478         char modes_add[COMMAND_LEN], l[16], *ptr;
 479         CLIENT *from;
 480         CHANNEL *chan;
 481         int arg_topic;
 482
 483         assert( Client != NULL );
 484         assert( Req != NULL );
 485
 486         /* Bad number of parameters? */
 487         if(( Req->argc < 2 ) || ( Req->argc == 4 ) || ( Req->argc > 5 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 488
 489         /* Compatibility kludge */
 490         if( Req->argc == 5 ) arg_topic = 4;
 491         else if( Req->argc == 3 ) arg_topic = 2;
 492         else arg_topic = -1;
 493
 494         /* Search origin */
 495         from = Client_Search( Req->prefix );
 496         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 497
 498         /* Search or create channel */
 499         chan = Channel_Search( Req->argv[0] );
 500         if( ! chan ) chan = Channel_Create( Req->argv[0] );
 501         if( ! chan ) return CONNECTED;
 502
 503         if( Req->argv[1][0] == '+' )
 504         {
 505                 ptr = Channel_Modes( chan );
 506                 if( ! *ptr )
 507                 {
 508                         /* OK, this channel doesn't have modes jet, set the received ones: */
 509                         Channel_SetModes( chan, &Req->argv[1][1] );
 510
 511                         if( Req->argc == 5 )
 512                         {
 513                                 if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
 514                                 if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
 515                         }
 516                         else
 517                         {
 518                                 /* Delete modes which we never want to inherit */
 519                                 Channel_ModeDel( chan, 'l' );
 520                                 Channel_ModeDel( chan, 'k' );
 521                         }
 522
 523                         strcpy( modes_add, "" );
 524                         ptr = Channel_Modes( chan );
 525                         while( *ptr )
 526                         {
 527                                 if( *ptr == 'l' )
 528                                 {
 529                                         snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
 530                                         strlcat( modes_add, l, sizeof( modes_add ));
 531                                 }
 532                                 if( *ptr == 'k' )
 533                                 {
 534                                         strlcat( modes_add, " ", sizeof( modes_add ));
 535                                         strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
 536                                 }
 537                                 ptr++;
 538                         }
 539
 540                         /* Inform members of this channel */
 541                         IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
 542                 }
 543         }
 544         else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
 545
 546         if( arg_topic > 0 )
 547         {
 548                 /* We got a topic */
 549                 ptr = Channel_Topic( chan );
 550                 if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
 551                 {
 552                         /* OK, there is no topic jet */
 553                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 554                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 555                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 556                 }
 557         }
 558
 559         /* Forward CHANINFO to other serevrs */
 560         if( Req->argc == 5 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2], Req->argv[3], Req->argv[4] );
 561         else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
 562         else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
 563
 564         return CONNECTED;
 565 } /* IRC_CHANINFO */
 566
 567
 568 /* -eof- */