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 1.45 2008/02/24 18:57:38 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;
  55         CHANNEL *chan;
  56
  57         while ((cl2chan = Channel_FirstChannelOf(target))) {
  58                 chan = Channel_GetChannel(cl2chan);
  59                 assert( chan != NULL );
  60                 Channel_Part(target, client, Channel_Name(chan), Client_ID(target));
  61         }
  62         return CONNECTED;
  63 }
  64
  65
  66 static bool
  67 join_allowed(CLIENT *Client, CLIENT *target, CHANNEL *chan,
  68                         const char *channame, const char *key)
  69 {
  70         bool is_invited, is_banned;
  71         const char *channel_modes;
  72
  73         /* Allow IRC operators to overwrite channel limits */
  74         if (strchr(Client_Modes(Client), 'o'))
  75                 return true;
  76
  77         is_banned = Lists_Check(Channel_GetListBans(chan), target);
  78         is_invited = Lists_Check(Channel_GetListInvites(chan), target);
  79
  80         if (is_banned && !is_invited) {
  81                 IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG, Client_ID(Client), channame);
  82                 return false;
  83         }
  84
  85         channel_modes = Channel_Modes(chan);
  86         if ((strchr(channel_modes, 'i')) && !is_invited) {
  87                 /* Channel is "invite-only" (and Client wasn't invited) */
  88                 IRC_WriteStrClient(Client, ERR_INVITEONLYCHAN_MSG, Client_ID(Client), channame);
  89                 return false;
  90         }
  91
  92         /* Is the channel protected by a key? */
  93         if (strchr(channel_modes, 'k') &&
  94                 strcmp(Channel_Key(chan), key ? key : ""))
  95         {
  96                 IRC_WriteStrClient(Client, ERR_BADCHANNELKEY_MSG, Client_ID(Client), channame);
  97                 return false;
  98         }
  99         /* Are there already too many members? */
 100         if ((strchr(channel_modes, 'l')) && (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
 101                 IRC_WriteStrClient(Client, ERR_CHANNELISFULL_MSG, Client_ID(Client), channame);
 102                 return false;
 103         }
 104         return true;
 105 }
 106
 107
 108 static void
 109 join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
 110 {
 111         if (flags) {
 112                 while (*flags) {
 113                         Channel_UserModeAdd(chan, target, *flags);
 114                         flags++;
 115                 }
 116         }
 117
 118         /* If channel persistent and client is ircop: make client chanop */
 119         if (strchr(Channel_Modes(chan), 'P') && strchr(Client_Modes(target), 'o'))
 120                 Channel_UserModeAdd(chan, target, 'o');
 121 }
 122
 123
 124 static void
 125 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 126                                         const char *channame)
 127 {
 128         char modes[8];
 129
 130         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 131
 132         if (modes[1])
 133                 modes[0] = 0x7;
 134         else
 135                 modes[0] = '\0';
 136         /* forward to other servers */
 137         IRC_WriteStrServersPrefix(Client, target, "JOIN :%s%s", channame, modes);
 138
 139         /* tell users in this channel about the new client */
 140         IRC_WriteStrChannelPrefix(Client, chan, target, false, "JOIN :%s", channame);
 141         if (modes[1])
 142                 IRC_WriteStrChannelPrefix(Client, chan, target, false, "MODE %s +%s %s",
 143                                                 channame, &modes[1], Client_ID(target));
 144 }
 145
 146
 147 static bool
 148 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 149                                         const char *channame)
 150 {
 151         const char *topic;
 152
 153         if (Client_Type(Client) != CLIENT_USER)
 154                 return true;
 155         /* acknowledge join */
 156         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 157                 return false;
 158
 159         /* Send topic to client, if any */
 160         topic = Channel_Topic(chan);
 161         assert(topic != NULL);
 162         if (*topic) {
 163                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 164                         Client_ID(Client), channame, topic))
 165                                 return false;
 166 #ifndef STRICT_RFC
 167                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 168                         Client_ID(Client), channame,
 169                         Channel_TopicWho(chan),
 170                         Channel_TopicTime(chan)))
 171                                 return false;
 172 #endif
 173         }
 174         /* send list of channel members to client */
 175         if (!IRC_Send_NAMES(Client, chan))
 176                 return false;
 177         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client), Channel_Name(chan));
 178 }
 179
 180
 181 GLOBAL bool
 182 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 183 {
 184         char *channame, *channame_ptr, *key, *key_ptr, *flags;
 185         CLIENT *target;
 186         CHANNEL *chan;
 187
 188         assert( Client != NULL );
 189         assert( Req != NULL );
 190
 191         /* Bad number of arguments? */
 192         if (Req->argc < 1 || Req->argc > 2)
 193                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 194                                           Client_ID(Client), Req->command);
 195
 196         /* Who is the sender? */
 197         if (Client_Type(Client) == CLIENT_SERVER)
 198                 target = Client_Search(Req->prefix);
 199         else
 200                 target = Client;
 201
 202         if (!target)
 203                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG, Client_ID(Client), Req->prefix);
 204
 205         /* Is argument "0"? */
 206         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 207                 return part_from_all_channels(Client, target);
 208
 209         /* Are channel keys given? */
 210         if (Req->argc > 1) {
 211                 key = Req->argv[1];
 212                 key_ptr = strchr(key, ',');
 213                 if (key_ptr) *key_ptr = '\0';
 214         } else {
 215                 key = key_ptr = NULL;
 216         }
 217         channame = Req->argv[0];
 218         channame_ptr = strchr(channame, ',');
 219         if (channame_ptr) *channame_ptr = '\0';
 220
 221         while (channame) {
 222                 flags = NULL;
 223
 224                 /* Did the server include channel-user-modes? */
 225                 if (Client_Type(Client) == CLIENT_SERVER) {
 226                         flags = strchr(channame, 0x7);
 227                         if (flags) {
 228                                 *flags = '\0';
 229                                 flags++;
 230                         }
 231                 }
 232
 233                 chan = Channel_Search(channame);
 234                 if (!chan && Conf_PredefChannelsOnly) {
 235                          /* channel must be created, but server does not allow this */
 236                         IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG, Client_ID(Client), channame);
 237                         break;
 238                 }
 239
 240                 /* Local client? */
 241                 if (Client_Type(Client) == CLIENT_USER) {
 242                         /* Test if the user has reached his maximum channel count */
 243                         if ((Conf_MaxJoins > 0) && (Channel_CountForUser(Client) >= Conf_MaxJoins))
 244                                 return IRC_WriteStrClient(Client, ERR_TOOMANYCHANNELS_MSG,
 245                                                         Client_ID(Client), channame);
 246                         if (!chan) {
 247                                 /*
 248                                  * New Channel: first user will be channel operator
 249                                  * unless this is a modeless channel.
 250                                  */
 251                                 if (*channame != '+')
 252                                         flags = "o";
 253                         } else
 254                                 if (!join_allowed(Client, target, chan, channame, key))
 255                                         break;
 256                 } else {
 257                         /* Remote server: we don't need to know whether the
 258                          * client is invited or not, but we have to make sure
 259                          * that the "one shot" entries (generated by INVITE
 260                          * commands) in this list become deleted when a user
 261                          * joins a channel this way. */
 262                         if (chan) (void)Lists_Check(Channel_GetListInvites(chan), target);
 263                 }
 264
 265                 /* Join channel (and create channel if it doesn't exist) */
 266                 if (!Channel_Join(target, channame))
 267                         break;
 268
 269                 if (!chan) { /* channel is new; it has been created above */
 270                         chan = Channel_Search(channame);
 271                         assert(chan != NULL);
 272                         if (*channame == '+') { /* modeless channel... */
 273                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 274                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 275                         }
 276                 }
 277                 assert(chan != NULL);
 278
 279                 join_set_channelmodes(chan, target, flags);
 280
 281                 join_forward(Client, target, chan, channame);
 282
 283                 if (!join_send_topic(Client, target, chan, channame))
 284                         break; /* write error */
 285
 286                 /* next channel? */
 287                 channame = channame_ptr;
 288                 if (channame) {
 289                         channame++;
 290                         channame_ptr = strchr(channame, ',');
 291                         if (channame_ptr) *channame_ptr = '\0';
 292
 293                         if (key_ptr) {
 294                                 key = ++key_ptr;
 295                                 key_ptr = strchr(key, ',');
 296                                 if (key_ptr) *key_ptr = '\0';
 297                         }
 298                 }
 299         }
 300         return CONNECTED;
 301 } /* IRC_JOIN */
 302
 303
 304 /**
 305  * Handler for the IRC "PART" command.
 306  */
 307 GLOBAL bool
 308 IRC_PART(CLIENT * Client, REQUEST * Req)
 309 {
 310         CLIENT *target;
 311         char *chan;
 312
 313         assert(Client != NULL);
 314         assert(Req != NULL);
 315
 316         if (Req->argc < 1 || Req->argc > 2)
 317                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 318                                           Client_ID(Client), Req->command);
 319
 320         /* Get the sender */
 321         if (Client_Type(Client) == CLIENT_SERVER)
 322                 target = Client_Search(Req->prefix);
 323         else
 324                 target = Client;
 325         if (!target)
 326                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 327                                           Client_ID(Client), Req->prefix);
 328
 329         /* Loop over all the given channel names */
 330         chan = strtok(Req->argv[0], ",");
 331         while (chan) {
 332                 Channel_Part(target, Client, chan,
 333                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 334                 chan = strtok(NULL, ",");
 335         }
 336         return CONNECTED;
 337 } /* IRC_PART */
 338
 339
 340 GLOBAL bool
 341 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 342 {
 343         CHANNEL *chan;
 344         CLIENT *from;
 345         char *topic;
 346         bool r;
 347
 348         assert( Client != NULL );
 349         assert( Req != NULL );
 350
 351         if ((Req->argc < 1) || (Req->argc > 2))
 352                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG, Client_ID(Client), Req->command);
 353
 354         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 355         else from = Client;
 356         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 357
 358         /* Welcher Channel? */
 359         chan = Channel_Search( Req->argv[0] );
 360         if( ! chan ) return IRC_WriteStrClient( from, ERR_NOSUCHCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
 361
 362         /* Ist der User Mitglied in dem Channel? */
 363         if( ! Channel_IsMemberOf( chan, from )) return IRC_WriteStrClient( from, ERR_NOTONCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
 364
 365         if( Req->argc == 1 )
 366         {
 367                 /* Request actual topic */
 368                 topic = Channel_Topic(chan);
 369                 if (*topic) {
 370                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 371                                 Client_ID(Client), Channel_Name(chan), topic);
 372 #ifndef STRICT_RFC
 373                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 374                                 Client_ID(Client), Channel_Name(chan),
 375                                 Channel_TopicWho(chan),
 376                                 Channel_TopicTime(chan));
 377 #endif
 378                         return r;
 379                 }
 380                 else
 381                          return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 382                                         Client_ID(from), Channel_Name(chan));
 383         }
 384
 385         if( strchr( Channel_Modes( chan ), 't' ))
 386         {
 387                 /* Topic Lock. Ist der User ein Channel Operator? */
 388                 if( ! strchr( Channel_UserModes( chan, from ), 'o' )) return IRC_WriteStrClient( from, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( from ), Channel_Name( chan ));
 389         }
 390
 391         /* Set new topic */
 392         Channel_SetTopic(chan, from, Req->argv[1]);
 393         Log(LOG_DEBUG, "User \"%s\" set topic on \"%s\": %s",
 394                 Client_Mask(from), Channel_Name(chan),
 395                 Req->argv[1][0] ? Req->argv[1] : "<none>");
 396
 397         /* im Channel bekannt machen und an Server weiterleiten */
 398         IRC_WriteStrServersPrefix( Client, from, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 399         IRC_WriteStrChannelPrefix( Client, chan, from, false, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 400
 401         if( Client_Type( Client ) == CLIENT_USER ) return IRC_WriteStrClientPrefix( Client, Client, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 402         else return CONNECTED;
 403 } /* IRC_TOPIC */
 404
 405
 406 /**
 407  * Handler for the IRC "LIST" command.
 408  * This implementation handles the local case as well as the forwarding of the
 409  * LIST command to other servers in the IRC network.
 410  */
 411 GLOBAL bool
 412 IRC_LIST( CLIENT *Client, REQUEST *Req )
 413 {
 414         char *pattern;
 415         CHANNEL *chan;
 416         CLIENT *from, *target;
 417
 418         assert( Client != NULL );
 419         assert( Req != NULL );
 420
 421         /* Bad number of prameters? */
 422         if( Req->argc > 2 )
 423                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 424                         Client_ID( Client ), Req->command );
 425
 426         if( Req->argc > 0 )
 427                 pattern = strtok( Req->argv[0], "," );
 428         else
 429                 pattern = "*";
 430
 431         /* Get sender from prefix, if any */
 432         if( Client_Type( Client ) == CLIENT_SERVER )
 433                 from = Client_Search( Req->prefix );
 434         else
 435                 from = Client;
 436
 437         if( ! from )
 438                 return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG,
 439                                 Client_ID( Client ), Req->prefix );
 440
 441         if( Req->argc == 2 )
 442         {
 443                 /* Forward to other server? */
 444                 target = Client_Search( Req->argv[1] );
 445                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
 446                         return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG,
 447                                         Client_ID( Client ), Req->argv[1] );
 448
 449                 if( target != Client_ThisServer( ))
 450                 {
 451                         /* Target is indeed an other server, forward it! */
 452                         return IRC_WriteStrClientPrefix( target, from,
 453                                         "LIST %s :%s", Client_ID( from ),
 454                                         Req->argv[1] );
 455                 }
 456         }
 457
 458         while( pattern )
 459         {
 460                 /* Loop through all the channels */
 461                 chan = Channel_First( );
 462                 while( chan )
 463                 {
 464                         /* Check search pattern */
 465                         if( Match( pattern, Channel_Name( chan )))
 466                         {
 467                                 /* Gotcha! */
 468                                 if( ! strchr( Channel_Modes( chan ), 's' ) ||
 469                                     Channel_IsMemberOf( chan, from ))
 470                                 {
 471                                         if( ! IRC_WriteStrClient( from,
 472                                             RPL_LIST_MSG, Client_ID( from ),
 473                                             Channel_Name( chan ),
 474                                             Channel_MemberCount( chan ),
 475                                             Channel_Topic( chan )))
 476                                                 return DISCONNECTED;
 477                                 }
 478                         }
 479                         chan = Channel_Next( chan );
 480                 }
 481
 482                 /* Get next name ... */
 483                 if( Req->argc > 0 )
 484                         pattern = strtok( NULL, "," );
 485                 else
 486                         pattern = NULL;
 487         }
 488
 489         return IRC_WriteStrClient( from, RPL_LISTEND_MSG, Client_ID( from ));
 490 } /* IRC_LIST */
 491
 492
 493 GLOBAL bool
 494 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 495 {
 496         char modes_add[COMMAND_LEN], l[16], *ptr;
 497         CLIENT *from;
 498         CHANNEL *chan;
 499         int arg_topic;
 500
 501         assert( Client != NULL );
 502         assert( Req != NULL );
 503
 504         /* Bad number of parameters? */
 505         if(( Req->argc < 2 ) || ( Req->argc == 4 ) || ( Req->argc > 5 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 506
 507         /* Compatibility kludge */
 508         if( Req->argc == 5 ) arg_topic = 4;
 509         else if( Req->argc == 3 ) arg_topic = 2;
 510         else arg_topic = -1;
 511
 512         /* Search origin */
 513         from = Client_Search( Req->prefix );
 514         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 515
 516         /* Search or create channel */
 517         chan = Channel_Search( Req->argv[0] );
 518         if( ! chan ) chan = Channel_Create( Req->argv[0] );
 519         if( ! chan ) return CONNECTED;
 520
 521         if( Req->argv[1][0] == '+' )
 522         {
 523                 ptr = Channel_Modes( chan );
 524                 if( ! *ptr )
 525                 {
 526                         /* OK, this channel doesn't have modes jet, set the received ones: */
 527                         Channel_SetModes( chan, &Req->argv[1][1] );
 528
 529                         if( Req->argc == 5 )
 530                         {
 531                                 if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
 532                                 if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
 533                         }
 534                         else
 535                         {
 536                                 /* Delete modes which we never want to inherit */
 537                                 Channel_ModeDel( chan, 'l' );
 538                                 Channel_ModeDel( chan, 'k' );
 539                         }
 540
 541                         strcpy( modes_add, "" );
 542                         ptr = Channel_Modes( chan );
 543                         while( *ptr )
 544                         {
 545                                 if( *ptr == 'l' )
 546                                 {
 547                                         snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
 548                                         strlcat( modes_add, l, sizeof( modes_add ));
 549                                 }
 550                                 if( *ptr == 'k' )
 551                                 {
 552                                         strlcat( modes_add, " ", sizeof( modes_add ));
 553                                         strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
 554                                 }
 555                                 ptr++;
 556                         }
 557
 558                         /* Inform members of this channel */
 559                         IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
 560                 }
 561         }
 562         else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
 563
 564         if( arg_topic > 0 )
 565         {
 566                 /* We got a topic */
 567                 ptr = Channel_Topic( chan );
 568                 if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
 569                 {
 570                         /* OK, there is no topic jet */
 571                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 572                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 573                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 574                 }
 575         }
 576
 577         /* Forward CHANINFO to other serevrs */
 578         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] );
 579         else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
 580         else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
 581
 582         return CONNECTED;
 583 } /* IRC_CHANINFO */
 584
 585
 586 /* -eof- */