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                                  */
 247                                 if (*channame != '+')
 248                                         flags = "o";
 249                         } else
 250                                 if (!join_allowed(Client, target, chan, channame, key))
 251                                         break;
 252                 } else {
 253                         /* Remote server: we don't need to know whether the
 254                          * client is invited or not, but we have to make sure
 255                          * that the "one shot" entries (generated by INVITE
 256                          * commands) in this list become deleted when a user
 257                          * joins a channel this way. */
 258                         if (chan) (void)Lists_Check(Channel_GetListInvites(chan), target);
 259                 }
 260
 261                 /* Join channel (and create channel if it doesn't exist) */
 262                 if (!Channel_Join(target, channame))
 263                         break;
 264
 265                 if (!chan) { /* channel is new; it has been created above */
 266                         chan = Channel_Search(channame);
 267                         assert(chan != NULL);
 268                         if (*channame == '+') { /* modeless channel... */
 269                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 270                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 271                         }
 272                 }
 273                 assert(chan != NULL);
 274
 275                 join_set_channelmodes(chan, target, flags);
 276
 277                 join_forward(Client, target, chan, channame);
 278
 279                 if (!join_send_topic(Client, target, chan, channame))
 280                         break; /* write error */
 281
 282                 /* next channel? */
 283                 channame = channame_ptr;
 284                 if (channame) {
 285                         channame++;
 286                         channame_ptr = strchr(channame, ',');
 287                         if (channame_ptr) *channame_ptr = '\0';
 288
 289                         if (key_ptr) {
 290                                 key = ++key_ptr;
 291                                 key_ptr = strchr(key, ',');
 292                                 if (key_ptr) *key_ptr = '\0';
 293                         }
 294                 }
 295         }
 296         return CONNECTED;
 297 } /* IRC_JOIN */
 298
 299
 300 /**
 301  * Handler for the IRC "PART" command.
 302  */
 303 GLOBAL bool
 304 IRC_PART(CLIENT * Client, REQUEST * Req)
 305 {
 306         CLIENT *target;
 307         char *chan;
 308
 309         assert(Client != NULL);
 310         assert(Req != NULL);
 311
 312         if (Req->argc < 1 || Req->argc > 2)
 313                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 314                                           Client_ID(Client), Req->command);
 315
 316         /* Get the sender */
 317         if (Client_Type(Client) == CLIENT_SERVER)
 318                 target = Client_Search(Req->prefix);
 319         else
 320                 target = Client;
 321         if (!target)
 322                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 323                                           Client_ID(Client), Req->prefix);
 324
 325         /* Loop over all the given channel names */
 326         chan = strtok(Req->argv[0], ",");
 327         while (chan) {
 328                 Channel_Part(target, Client, chan,
 329                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 330                 chan = strtok(NULL, ",");
 331         }
 332         return CONNECTED;
 333 } /* IRC_PART */
 334
 335
 336 GLOBAL bool
 337 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 338 {
 339         CHANNEL *chan;
 340         CLIENT *from;
 341         char *topic;
 342         bool r;
 343
 344         assert( Client != NULL );
 345         assert( Req != NULL );
 346
 347         if ((Req->argc < 1) || (Req->argc > 2))
 348                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG, Client_ID(Client), Req->command);
 349
 350         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 351         else from = Client;
 352         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 353
 354         /* Welcher Channel? */
 355         chan = Channel_Search( Req->argv[0] );
 356         if( ! chan ) return IRC_WriteStrClient( from, ERR_NOSUCHCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
 357
 358         /* Ist der User Mitglied in dem Channel? */
 359         if( ! Channel_IsMemberOf( chan, from )) return IRC_WriteStrClient( from, ERR_NOTONCHANNEL_MSG, Client_ID( from ), Req->argv[0] );
 360
 361         if( Req->argc == 1 )
 362         {
 363                 /* Request actual topic */
 364                 topic = Channel_Topic(chan);
 365                 if (*topic) {
 366                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 367                                 Client_ID(Client), Channel_Name(chan), topic);
 368 #ifndef STRICT_RFC
 369                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 370                                 Client_ID(Client), Channel_Name(chan),
 371                                 Channel_TopicWho(chan),
 372                                 Channel_TopicTime(chan));
 373 #endif
 374                         return r;
 375                 }
 376                 else
 377                          return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 378                                         Client_ID(from), Channel_Name(chan));
 379         }
 380
 381         if( strchr( Channel_Modes( chan ), 't' ))
 382         {
 383                 /* Topic Lock. Ist der User ein Channel Operator? */
 384                 if( ! strchr( Channel_UserModes( chan, from ), 'o' )) return IRC_WriteStrClient( from, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( from ), Channel_Name( chan ));
 385         }
 386
 387         /* Set new topic */
 388         Channel_SetTopic(chan, from, Req->argv[1]);
 389         Log(LOG_DEBUG, "User \"%s\" set topic on \"%s\": %s",
 390                 Client_Mask(from), Channel_Name(chan),
 391                 Req->argv[1][0] ? Req->argv[1] : "<none>");
 392
 393         /* im Channel bekannt machen und an Server weiterleiten */
 394         IRC_WriteStrServersPrefix( Client, from, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 395         IRC_WriteStrChannelPrefix( Client, chan, from, false, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 396
 397         if( Client_Type( Client ) == CLIENT_USER ) return IRC_WriteStrClientPrefix( Client, Client, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
 398         else return CONNECTED;
 399 } /* IRC_TOPIC */
 400
 401
 402 /**
 403  * Handler for the IRC "LIST" command.
 404  * This implementation handles the local case as well as the forwarding of the
 405  * LIST command to other servers in the IRC network.
 406  */
 407 GLOBAL bool
 408 IRC_LIST( CLIENT *Client, REQUEST *Req )
 409 {
 410         char *pattern;
 411         CHANNEL *chan;
 412         CLIENT *from, *target;
 413
 414         assert( Client != NULL );
 415         assert( Req != NULL );
 416
 417         /* Bad number of prameters? */
 418         if( Req->argc > 2 )
 419                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 420                         Client_ID( Client ), Req->command );
 421
 422         if( Req->argc > 0 )
 423                 pattern = strtok( Req->argv[0], "," );
 424         else
 425                 pattern = "*";
 426
 427         /* Get sender from prefix, if any */
 428         if( Client_Type( Client ) == CLIENT_SERVER )
 429                 from = Client_Search( Req->prefix );
 430         else
 431                 from = Client;
 432
 433         if( ! from )
 434                 return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG,
 435                                 Client_ID( Client ), Req->prefix );
 436
 437         if( Req->argc == 2 )
 438         {
 439                 /* Forward to other server? */
 440                 target = Client_Search( Req->argv[1] );
 441                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
 442                         return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG,
 443                                         Client_ID( Client ), Req->argv[1] );
 444
 445                 if( target != Client_ThisServer( ))
 446                 {
 447                         /* Target is indeed an other server, forward it! */
 448                         return IRC_WriteStrClientPrefix( target, from,
 449                                         "LIST %s :%s", Client_ID( from ),
 450                                         Req->argv[1] );
 451                 }
 452         }
 453
 454         while( pattern )
 455         {
 456                 /* Loop through all the channels */
 457                 chan = Channel_First( );
 458                 while( chan )
 459                 {
 460                         /* Check search pattern */
 461                         if( Match( pattern, Channel_Name( chan )))
 462                         {
 463                                 /* Gotcha! */
 464                                 if( ! strchr( Channel_Modes( chan ), 's' ) ||
 465                                     Channel_IsMemberOf( chan, from ))
 466                                 {
 467                                         if( ! IRC_WriteStrClient( from,
 468                                             RPL_LIST_MSG, Client_ID( from ),
 469                                             Channel_Name( chan ),
 470                                             Channel_MemberCount( chan ),
 471                                             Channel_Topic( chan )))
 472                                                 return DISCONNECTED;
 473                                 }
 474                         }
 475                         chan = Channel_Next( chan );
 476                 }
 477
 478                 /* Get next name ... */
 479                 if( Req->argc > 0 )
 480                         pattern = strtok( NULL, "," );
 481                 else
 482                         pattern = NULL;
 483         }
 484
 485         return IRC_WriteStrClient( from, RPL_LISTEND_MSG, Client_ID( from ));
 486 } /* IRC_LIST */
 487
 488
 489 GLOBAL bool
 490 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 491 {
 492         char modes_add[COMMAND_LEN], l[16], *ptr;
 493         CLIENT *from;
 494         CHANNEL *chan;
 495         int arg_topic;
 496
 497         assert( Client != NULL );
 498         assert( Req != NULL );
 499
 500         /* Bad number of parameters? */
 501         if(( Req->argc < 2 ) || ( Req->argc == 4 ) || ( Req->argc > 5 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 502
 503         /* Compatibility kludge */
 504         if( Req->argc == 5 ) arg_topic = 4;
 505         else if( Req->argc == 3 ) arg_topic = 2;
 506         else arg_topic = -1;
 507
 508         /* Search origin */
 509         from = Client_Search( Req->prefix );
 510         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 511
 512         /* Search or create channel */
 513         chan = Channel_Search( Req->argv[0] );
 514         if( ! chan ) chan = Channel_Create( Req->argv[0] );
 515         if( ! chan ) return CONNECTED;
 516
 517         if( Req->argv[1][0] == '+' )
 518         {
 519                 ptr = Channel_Modes( chan );
 520                 if( ! *ptr )
 521                 {
 522                         /* OK, this channel doesn't have modes jet, set the received ones: */
 523                         Channel_SetModes( chan, &Req->argv[1][1] );
 524
 525                         if( Req->argc == 5 )
 526                         {
 527                                 if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
 528                                 if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
 529                         }
 530                         else
 531                         {
 532                                 /* Delete modes which we never want to inherit */
 533                                 Channel_ModeDel( chan, 'l' );
 534                                 Channel_ModeDel( chan, 'k' );
 535                         }
 536
 537                         strcpy( modes_add, "" );
 538                         ptr = Channel_Modes( chan );
 539                         while( *ptr )
 540                         {
 541                                 if( *ptr == 'l' )
 542                                 {
 543                                         snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
 544                                         strlcat( modes_add, l, sizeof( modes_add ));
 545                                 }
 546                                 if( *ptr == 'k' )
 547                                 {
 548                                         strlcat( modes_add, " ", sizeof( modes_add ));
 549                                         strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
 550                                 }
 551                                 ptr++;
 552                         }
 553
 554                         /* Inform members of this channel */
 555                         IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
 556                 }
 557         }
 558         else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
 559
 560         if( arg_topic > 0 )
 561         {
 562                 /* We got a topic */
 563                 ptr = Channel_Topic( chan );
 564                 if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
 565                 {
 566                         /* OK, there is no topic jet */
 567                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 568                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 569                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 570                 }
 571         }
 572
 573         /* Forward CHANINFO to other serevrs */
 574         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] );
 575         else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
 576         else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
 577
 578         return CONNECTED;
 579 } /* IRC_CHANINFO */
 580
 581
 582 /* -eof- */