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