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 "conn-func.h"
  30 #include "lists.h"
  31 #include "log.h"
  32 #include "match.h"
  33 #include "messages.h"
  34 #include "parse.h"
  35 #include "irc-info.h"
  36 #include "irc-write.h"
  37 #include "resolve.h"
  38 #include "conf.h"
  39
  40 #include "exp.h"
  41 #include "irc-channel.h"
  42
  43
  44 /*
  45  * RFC 2812, (3.2.1 Join message Command):
  46  *  Note that this message
  47  *  accepts a special argument ("0"), which is a special request to leave all
  48  *  channels the user is currently a member of. The server will process this
  49  *  message as if the user had sent a PART command (See Section 3.2.2) for
  50  *  each channel he is a member of.
  51  */
  52 static bool
  53 part_from_all_channels(CLIENT* client, CLIENT *target)
  54 {
  55         CL2CHAN *cl2chan;
  56         CHANNEL *chan;
  57
  58         while ((cl2chan = Channel_FirstChannelOf(target))) {
  59                 chan = Channel_GetChannel(cl2chan);
  60                 assert( chan != NULL );
  61                 Channel_Part(target, client, Channel_Name(chan), Client_ID(target));
  62         }
  63         return CONNECTED;
  64 }
  65
  66
  67 static bool
  68 join_allowed(CLIENT *Client, CLIENT *target, CHANNEL *chan,
  69                         const char *channame, const char *key)
  70 {
  71         bool is_invited, is_banned;
  72         const char *channel_modes;
  73
  74         /* Allow IRC operators to overwrite channel limits */
  75         if (strchr(Client_Modes(Client), 'o'))
  76                 return true;
  77
  78         is_banned = Lists_Check(Channel_GetListBans(chan), target);
  79         is_invited = Lists_Check(Channel_GetListInvites(chan), target);
  80
  81         if (is_banned && !is_invited) {
  82                 IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG, Client_ID(Client), channame);
  83                 return false;
  84         }
  85
  86         channel_modes = Channel_Modes(chan);
  87         if ((strchr(channel_modes, 'i')) && !is_invited) {
  88                 /* Channel is "invite-only" (and Client wasn't invited) */
  89                 IRC_WriteStrClient(Client, ERR_INVITEONLYCHAN_MSG, Client_ID(Client), channame);
  90                 return false;
  91         }
  92
  93         /* Is the channel protected by a key? */
  94         if (strchr(channel_modes, 'k') &&
  95                 strcmp(Channel_Key(chan), key ? key : ""))
  96         {
  97                 IRC_WriteStrClient(Client, ERR_BADCHANNELKEY_MSG, Client_ID(Client), channame);
  98                 return false;
  99         }
 100         /* Are there already too many members? */
 101         if ((strchr(channel_modes, 'l')) && (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
 102                 IRC_WriteStrClient(Client, ERR_CHANNELISFULL_MSG, Client_ID(Client), channame);
 103                 return false;
 104         }
 105         return true;
 106 }
 107
 108
 109 static void
 110 join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
 111 {
 112         if (flags) {
 113                 while (*flags) {
 114                         Channel_UserModeAdd(chan, target, *flags);
 115                         flags++;
 116                 }
 117         }
 118
 119         /* If channel persistent and client is ircop: make client chanop */
 120         if (strchr(Channel_Modes(chan), 'P') && strchr(Client_Modes(target), 'o'))
 121                 Channel_UserModeAdd(chan, target, 'o');
 122 }
 123
 124
 125 static void
 126 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 127                                         const char *channame)
 128 {
 129         char modes[8];
 130
 131         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 132
 133         if (modes[1])
 134                 modes[0] = 0x7;
 135         else
 136                 modes[0] = '\0';
 137         /* forward to other servers */
 138         IRC_WriteStrServersPrefix(Client, target, "JOIN :%s%s", channame, modes);
 139
 140         /* tell users in this channel about the new client */
 141         IRC_WriteStrChannelPrefix(Client, chan, target, false, "JOIN :%s", channame);
 142         if (modes[1])
 143                 IRC_WriteStrChannelPrefix(Client, chan, target, false, "MODE %s +%s %s",
 144                                                 channame, &modes[1], Client_ID(target));
 145 }
 146
 147
 148 static bool
 149 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 150                                         const char *channame)
 151 {
 152         const char *topic;
 153
 154         if (Client_Type(Client) != CLIENT_USER)
 155                 return true;
 156         /* acknowledge join */
 157         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 158                 return false;
 159
 160         /* Send topic to client, if any */
 161         topic = Channel_Topic(chan);
 162         assert(topic != NULL);
 163         if (*topic) {
 164                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 165                         Client_ID(Client), channame, topic))
 166                                 return false;
 167 #ifndef STRICT_RFC
 168                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 169                         Client_ID(Client), channame,
 170                         Channel_TopicWho(chan),
 171                         Channel_TopicTime(chan)))
 172                                 return false;
 173 #endif
 174         }
 175         /* send list of channel members to client */
 176         if (!IRC_Send_NAMES(Client, chan))
 177                 return false;
 178         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client), Channel_Name(chan));
 179 }
 180
 181
 182 GLOBAL bool
 183 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 184 {
 185         char *channame, *channame_ptr, *key, *key_ptr, *flags;
 186         CLIENT *target;
 187         CHANNEL *chan;
 188
 189         assert( Client != NULL );
 190         assert( Req != NULL );
 191
 192         /* Bad number of arguments? */
 193         if (Req->argc < 1 || Req->argc > 2)
 194                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 195                                           Client_ID(Client), Req->command);
 196
 197         /* Who is the sender? */
 198         if (Client_Type(Client) == CLIENT_SERVER)
 199                 target = Client_Search(Req->prefix);
 200         else
 201                 target = Client;
 202
 203         if (!target)
 204                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG, Client_ID(Client), Req->prefix);
 205
 206         /* Is argument "0"? */
 207         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 208                 return part_from_all_channels(Client, target);
 209
 210         /* Are channel keys given? */
 211         if (Req->argc > 1) {
 212                 key = Req->argv[1];
 213                 key_ptr = strchr(key, ',');
 214                 if (key_ptr) *key_ptr = '\0';
 215         } else {
 216                 key = key_ptr = NULL;
 217         }
 218         channame = Req->argv[0];
 219         channame_ptr = strchr(channame, ',');
 220         if (channame_ptr) *channame_ptr = '\0';
 221
 222         while (channame) {
 223                 flags = NULL;
 224
 225                 /* Did the server include channel-user-modes? */
 226                 if (Client_Type(Client) == CLIENT_SERVER) {
 227                         flags = strchr(channame, 0x7);
 228                         if (flags) {
 229                                 *flags = '\0';
 230                                 flags++;
 231                         }
 232                 }
 233
 234                 chan = Channel_Search(channame);
 235                 if (!chan && Conf_PredefChannelsOnly) {
 236                          /* channel must be created, but server does not allow this */
 237                         IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG, Client_ID(Client), channame);
 238                         break;
 239                 }
 240
 241                 /* Local client? */
 242                 if (Client_Type(Client) == CLIENT_USER) {
 243                         /* Test if the user has reached his maximum channel count */
 244                         if ((Conf_MaxJoins > 0) && (Channel_CountForUser(Client) >= Conf_MaxJoins))
 245                                 return IRC_WriteStrClient(Client, ERR_TOOMANYCHANNELS_MSG,
 246                                                         Client_ID(Client), channame);
 247                         if (!chan) {
 248                                 /*
 249                                  * New Channel: first user will be channel operator
 250                                  * unless this is a modeless channel.
 251                                  */
 252                                 if (*channame != '+')
 253                                         flags = "o";
 254                         } else
 255                                 if (!join_allowed(Client, target, chan, channame, key))
 256                                         break;
 257
 258                         /* Local client: update idle time */
 259                         Conn_UpdateIdle(Client_Conn(Client));
 260                 } else {
 261                         /* Remote server: we don't need to know whether the
 262                          * client is invited or not, but we have to make sure
 263                          * that the "one shot" entries (generated by INVITE
 264                          * commands) in this list become deleted when a user
 265                          * joins a channel this way. */
 266                         if (chan) (void)Lists_Check(Channel_GetListInvites(chan), target);
 267                 }
 268
 269                 /* Join channel (and create channel if it doesn't exist) */
 270                 if (!Channel_Join(target, channame))
 271                         break;
 272
 273                 if (!chan) { /* channel is new; it has been created above */
 274                         chan = Channel_Search(channame);
 275                         assert(chan != NULL);
 276                         if (*channame == '+') { /* modeless channel... */
 277                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 278                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 279                         }
 280                 }
 281                 assert(chan != NULL);
 282
 283                 join_set_channelmodes(chan, target, flags);
 284
 285                 join_forward(Client, target, chan, channame);
 286
 287                 if (!join_send_topic(Client, target, chan, channame))
 288                         break; /* write error */
 289
 290                 /* next channel? */
 291                 channame = channame_ptr;
 292                 if (channame) {
 293                         channame++;
 294                         channame_ptr = strchr(channame, ',');
 295                         if (channame_ptr) *channame_ptr = '\0';
 296
 297                         if (key_ptr) {
 298                                 key = ++key_ptr;
 299                                 key_ptr = strchr(key, ',');
 300                                 if (key_ptr) *key_ptr = '\0';
 301                         }
 302                 }
 303         }
 304         return CONNECTED;
 305 } /* IRC_JOIN */
 306
 307
 308 /**
 309  * Handler for the IRC "PART" command.
 310  */
 311 GLOBAL bool
 312 IRC_PART(CLIENT * Client, REQUEST * Req)
 313 {
 314         CLIENT *target;
 315         char *chan;
 316
 317         assert(Client != NULL);
 318         assert(Req != NULL);
 319
 320         if (Req->argc < 1 || Req->argc > 2)
 321                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 322                                           Client_ID(Client), Req->command);
 323
 324         /* Get the sender */
 325         if (Client_Type(Client) == CLIENT_SERVER)
 326                 target = Client_Search(Req->prefix);
 327         else
 328                 target = Client;
 329         if (!target)
 330                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 331                                           Client_ID(Client), Req->prefix);
 332
 333         /* Loop over all the given channel names */
 334         chan = strtok(Req->argv[0], ",");
 335         while (chan) {
 336                 Channel_Part(target, Client, chan,
 337                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 338                 chan = strtok(NULL, ",");
 339         }
 340
 341         /* Update idle time, if local client */
 342         if (Client_Conn(Client) > NONE)
 343                 Conn_UpdateIdle(Client_Conn(Client));
 344
 345         return CONNECTED;
 346 } /* IRC_PART */
 347
 348
 349 GLOBAL bool
 350 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 351 {
 352         CHANNEL *chan;
 353         CLIENT *from;
 354         char *topic;
 355         bool r;
 356
 357         assert( Client != NULL );
 358         assert( Req != NULL );
 359
 360         if ((Req->argc < 1) || (Req->argc > 2))
 361                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG, Client_ID(Client), Req->command);
 362
 363         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 364         else from = Client;
 365         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 366
 367         /* Welcher Channel? */
 368         chan = Channel_Search( Req->argv[0] );
 369         if( ! chan ) return IRC_WriteStrClient( from, ERR_NOSUCHCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
 370
 371         /* Ist der User Mitglied in dem Channel? */
 372         if( ! Channel_IsMemberOf( chan, from )) return IRC_WriteStrClient( from, ERR_NOTONCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
 373
 374         if( Req->argc == 1 )
 375         {
 376                 /* Request actual topic */
 377                 topic = Channel_Topic(chan);
 378                 if (*topic) {
 379                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 380                                 Client_ID(Client), Channel_Name(chan), topic);
 381 #ifndef STRICT_RFC
 382                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 383                                 Client_ID(Client), Channel_Name(chan),
 384                                 Channel_TopicWho(chan),
 385                                 Channel_TopicTime(chan));
 386 #endif
 387                         return r;
 388                 }
 389                 else
 390                          return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 391                                         Client_ID(from), Channel_Name(chan));
 392         }
 393
 394         if( strchr( Channel_Modes( chan ), 't' ))
 395         {
 396                 /* Topic Lock. Ist der User ein Channel Operator? */
 397                 if( ! strchr( Channel_UserModes( chan, from ), 'o' )) return IRC_WriteStrClient( from, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( from ), Channel_Name( chan ));
 398         }
 399
 400         /* Set new topic */
 401         Channel_SetTopic(chan, from, Req->argv[1]);
 402         Log(LOG_DEBUG, "User \"%s\" set topic on \"%s\": %s",
 403                 Client_Mask(from), Channel_Name(chan),
 404                 Req->argv[1][0] ? Req->argv[1] : "<none>");
 405
 406         /* im Channel bekannt machen und an Server weiterleiten */
 407         IRC_WriteStrServersPrefix( Client, from, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 408         IRC_WriteStrChannelPrefix( Client, chan, from, false, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 409
 410         if( Client_Type( Client ) == CLIENT_USER ) return IRC_WriteStrClientPrefix( Client, Client, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 411         else return CONNECTED;
 412 } /* IRC_TOPIC */
 413
 414
 415 /**
 416  * Handler for the IRC "LIST" command.
 417  * This implementation handles the local case as well as the forwarding of the
 418  * LIST command to other servers in the IRC network.
 419  */
 420 GLOBAL bool
 421 IRC_LIST( CLIENT *Client, REQUEST *Req )
 422 {
 423         char *pattern;
 424         CHANNEL *chan;
 425         CLIENT *from, *target;
 426
 427         assert( Client != NULL );
 428         assert( Req != NULL );
 429
 430         /* Bad number of prameters? */
 431         if( Req->argc > 2 )
 432                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 433                         Client_ID( Client ), Req->command );
 434
 435         if( Req->argc > 0 )
 436                 pattern = strtok( Req->argv[0], "," );
 437         else
 438                 pattern = "*";
 439
 440         /* Get sender from prefix, if any */
 441         if( Client_Type( Client ) == CLIENT_SERVER )
 442                 from = Client_Search( Req->prefix );
 443         else
 444                 from = Client;
 445
 446         if( ! from )
 447                 return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG,
 448                                 Client_ID( Client ), Req->prefix );
 449
 450         if( Req->argc == 2 )
 451         {
 452                 /* Forward to other server? */
 453                 target = Client_Search( Req->argv[1] );
 454                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
 455                         return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG,
 456                                         Client_ID( Client ), Req->argv[1] );
 457
 458                 if( target != Client_ThisServer( ))
 459                 {
 460                         /* Target is indeed an other server, forward it! */
 461                         return IRC_WriteStrClientPrefix( target, from,
 462                                         "LIST %s :%s", Client_ID( from ),
 463                                         Req->argv[1] );
 464                 }
 465         }
 466
 467         while( pattern )
 468         {
 469                 /* Loop through all the channels */
 470                 chan = Channel_First( );
 471                 while( chan )
 472                 {
 473                         /* Check search pattern */
 474                         if( Match( pattern, Channel_Name( chan )))
 475                         {
 476                                 /* Gotcha! */
 477                                 if( ! strchr( Channel_Modes( chan ), 's' ) ||
 478                                     Channel_IsMemberOf( chan, from ))
 479                                 {
 480                                         if( ! IRC_WriteStrClient( from,
 481                                             RPL_LIST_MSG, Client_ID( from ),
 482                                             Channel_Name( chan ),
 483                                             Channel_MemberCount( chan ),
 484                                             Channel_Topic( chan )))
 485                                                 return DISCONNECTED;
 486                                 }
 487                         }
 488                         chan = Channel_Next( chan );
 489                 }
 490
 491                 /* Get next name ... */
 492                 if( Req->argc > 0 )
 493                         pattern = strtok( NULL, "," );
 494                 else
 495                         pattern = NULL;
 496         }
 497
 498         return IRC_WriteStrClient( from, RPL_LISTEND_MSG, Client_ID( from ));
 499 } /* IRC_LIST */
 500
 501
 502 GLOBAL bool
 503 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 504 {
 505         char modes_add[COMMAND_LEN], l[16], *ptr;
 506         CLIENT *from;
 507         CHANNEL *chan;
 508         int arg_topic;
 509
 510         assert( Client != NULL );
 511         assert( Req != NULL );
 512
 513         /* Bad number of parameters? */
 514         if(( Req->argc < 2 ) || ( Req->argc == 4 ) || ( Req->argc > 5 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 515
 516         /* Compatibility kludge */
 517         if( Req->argc == 5 ) arg_topic = 4;
 518         else if( Req->argc == 3 ) arg_topic = 2;
 519         else arg_topic = -1;
 520
 521         /* Search origin */
 522         from = Client_Search( Req->prefix );
 523         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 524
 525         /* Search or create channel */
 526         chan = Channel_Search( Req->argv[0] );
 527         if( ! chan ) chan = Channel_Create( Req->argv[0] );
 528         if( ! chan ) return CONNECTED;
 529
 530         if( Req->argv[1][0] == '+' )
 531         {
 532                 ptr = Channel_Modes( chan );
 533                 if( ! *ptr )
 534                 {
 535                         /* OK, this channel doesn't have modes jet, set the received ones: */
 536                         Channel_SetModes( chan, &Req->argv[1][1] );
 537
 538                         if( Req->argc == 5 )
 539                         {
 540                                 if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
 541                                 if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
 542                         }
 543                         else
 544                         {
 545                                 /* Delete modes which we never want to inherit */
 546                                 Channel_ModeDel( chan, 'l' );
 547                                 Channel_ModeDel( chan, 'k' );
 548                         }
 549
 550                         strcpy( modes_add, "" );
 551                         ptr = Channel_Modes( chan );
 552                         while( *ptr )
 553                         {
 554                                 if( *ptr == 'l' )
 555                                 {
 556                                         snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
 557                                         strlcat( modes_add, l, sizeof( modes_add ));
 558                                 }
 559                                 if( *ptr == 'k' )
 560                                 {
 561                                         strlcat( modes_add, " ", sizeof( modes_add ));
 562                                         strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
 563                                 }
 564                                 ptr++;
 565                         }
 566
 567                         /* Inform members of this channel */
 568                         IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
 569                 }
 570         }
 571         else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
 572
 573         if( arg_topic > 0 )
 574         {
 575                 /* We got a topic */
 576                 ptr = Channel_Topic( chan );
 577                 if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
 578                 {
 579                         /* OK, there is no topic jet */
 580                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 581                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 582                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 583                 }
 584         }
 585
 586         /* Forward CHANINFO to other serevrs */
 587         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] );
 588         else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
 589         else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
 590
 591         return CONNECTED;
 592 } /* IRC_CHANINFO */
 593
 594
 595 /* -eof- */