src/ngircd/irc-channel.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2010 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
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC channel commands
  17  */
  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 "channel.h"
  28 #include "conn-func.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 "conf.h"
  37
  38 #include "exp.h"
  39 #include "irc-channel.h"
  40
  41
  42 /**
  43  * Part from all channels.
  44  *
  45  * RFC 2812, (3.2.1 Join message Command):
  46  *  Note that this message accepts a special argument ("0"), which is a
  47  *  special request to leave all channels the user is currently a member of.
  48  *  The server will process this message as if the user had sent a PART
  49  *  command (See Section 3.2.2) for each channel he is a member of.
  50  *
  51  * @param client        Client that initiated the part request
  52  * @param target        Client that should part all joined channels
  53  * @returns             CONNECTED or DISCONNECTED
  54  */
  55 static bool
  56 part_from_all_channels(CLIENT* client, CLIENT *target)
  57 {
  58         CL2CHAN *cl2chan;
  59         CHANNEL *chan;
  60
  61         while ((cl2chan = Channel_FirstChannelOf(target))) {
  62                 chan = Channel_GetChannel(cl2chan);
  63                 assert( chan != NULL );
  64                 Channel_Part(target, client, Channel_Name(chan), Client_ID(target));
  65         }
  66         return CONNECTED;
  67 } /* part_from_all_channels */
  68
  69
  70 /**
  71  * Check weather a local client is allowed to join an already existing
  72  * channel or not.
  73  *
  74  * @param Client        Client that sent the JOIN command
  75  * @param chan          Channel to check
  76  * @param channame      Name of the channel
  77  * @param key           Provided channel key (or NULL)
  78  * @returns             true if client is allowed to join, false otherwise
  79  */
  80 static bool
  81 join_allowed(CLIENT *Client, CHANNEL *chan, const char *channame,
  82              const char *key)
  83 {
  84         bool is_invited, is_banned;
  85         const char *channel_modes;
  86
  87         /* Allow IRC operators to overwrite channel limits */
  88         if (strchr(Client_Modes(Client), 'o'))
  89                 return true;
  90
  91         is_banned = Lists_Check(Channel_GetListBans(chan), Client);
  92         is_invited = Lists_Check(Channel_GetListInvites(chan), Client);
  93
  94         if (is_banned && !is_invited) {
  95                 /* Client is banned from channel (and not on invite list) */
  96                 IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG,
  97                                    Client_ID(Client), channame);
  98                 return false;
  99         }
 100
 101         channel_modes = Channel_Modes(chan);
 102         if (strchr(channel_modes, 'i') && !is_invited) {
 103                 /* Channel is "invite-only" and client is not on invite list */
 104                 IRC_WriteStrClient(Client, ERR_INVITEONLYCHAN_MSG,
 105                                    Client_ID(Client), channame);
 106                 return false;
 107         }
 108
 109         if (!Channel_CheckKey(chan, Client, key ? key : "")) {
 110                 /* Channel is protected by a channel key and the client
 111                  * didn't specify the correct one */
 112                 IRC_WriteStrClient(Client, ERR_BADCHANNELKEY_MSG,
 113                                    Client_ID(Client), channame);
 114                 return false;
 115         }
 116
 117         if (strchr(channel_modes, 'l') &&
 118             (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
 119                 /* There are more clints joined to this channel than allowed */
 120                 IRC_WriteStrClient(Client, ERR_CHANNELISFULL_MSG,
 121                                    Client_ID(Client), channame);
 122                 return false;
 123         }
 124
 125         if (strchr(channel_modes, 'z') && !Conn_UsesSSL(Client_Conn(Client))) {
 126                 /* Only "secure" clients are allowed, but clients doesn't
 127                  * use SSL encryption */
 128                 IRC_WriteStrClient(Client, ERR_SECURECHANNEL_MSG,
 129                                    Client_ID(Client), channame);
 130                 return false;
 131         }
 132
 133         if (strchr(channel_modes, 'O') && !Client_OperByMe(Client)) {
 134                 /* Only IRC operators are allowed! */
 135                 IRC_WriteStrClient(Client, ERR_OPONLYCHANNEL_MSG,
 136                                    Client_ID(Client), channame);
 137                 return false;
 138         }
 139
 140         return true;
 141 } /* join_allowed */
 142
 143
 144 /**
 145  * Set user channel modes.
 146  *
 147  * @param chan          Channel
 148  * @param target        User to set modes for
 149  * @param flags         Channel modes to add
 150  */
 151 static void
 152 join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
 153 {
 154         if (flags) {
 155                 while (*flags) {
 156                         Channel_UserModeAdd(chan, target, *flags);
 157                         flags++;
 158                 }
 159         }
 160
 161         /* If channel persistent and client is ircop: make client chanop */
 162         if (strchr(Channel_Modes(chan), 'P') && strchr(Client_Modes(target), 'o'))
 163                 Channel_UserModeAdd(chan, target, 'o');
 164 } /* join_set_channelmodes */
 165
 166
 167 /**
 168  * Forward JOIN command to a specific server
 169  *
 170  * This function diffentiates between servers using RFC 2813 mode that
 171  * support the JOIN command with appended ASCII 7 character and channel
 172  * modes, and servers using RFC 1459 protocol which require separate JOIN
 173  * and MODE commands.
 174  *
 175  * @param To            Forward JOIN (and MODE) command to this peer server
 176  * @param Prefix        Client used to prefix the genrated commands
 177  * @param Data          Parameters of JOIN command to forward, probably
 178  *                      containing channel modes separated by ASCII 7.
 179  */
 180 static void
 181 cb_join_forward(CLIENT *To, CLIENT *Prefix, void *Data)
 182 {
 183         CONN_ID conn;
 184         char str[COMMAND_LEN], *ptr = NULL;
 185
 186         strlcpy(str, (char *)Data, sizeof(str));
 187         conn = Client_Conn(To);
 188
 189         if (Conn_Options(conn) & CONN_RFC1459) {
 190                 /* RFC 1459 compatibility mode, appended modes are NOT
 191                  * supported, so strip them off! */
 192                 ptr = strchr(str, 0x7);
 193                 if (ptr)
 194                         *ptr++ = '\0';
 195         }
 196
 197         IRC_WriteStrClientPrefix(To, Prefix, "JOIN %s", str);
 198         if (ptr && *ptr)
 199                 IRC_WriteStrClientPrefix(To, Prefix, "MODE %s +%s %s", str, ptr,
 200                                          Client_ID(Prefix));
 201 } /* cb_join_forward */
 202
 203
 204 /**
 205  * Forward JOIN command to all servers
 206  *
 207  * This function calls cb_join_forward(), which differentiates between
 208  * protocol implementations (e.g. RFC 2812, RFC 1459).
 209  *
 210  * @param Client        Client used to prefix the genrated commands
 211  * @param target        Forward JOIN (and MODE) command to this peer server
 212  * @param chan          Channel structure
 213  * @param channame      Channel name
 214  */
 215 static void
 216 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 217                                         const char *channame)
 218 {
 219         char modes[CHANNEL_MODE_LEN], str[COMMAND_LEN];
 220
 221         /* RFC 2813, 4.2.1: channel modes are separated from the channel
 222          * name with ASCII 7, if any, and not spaces: */
 223         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 224         if (modes[1])
 225                 modes[0] = 0x7;
 226         else
 227                 modes[0] = '\0';
 228
 229         /* forward to other servers (if it is not a local channel) */
 230         if (!Channel_IsLocal(chan)) {
 231                 snprintf(str, sizeof(str), "%s%s", channame, modes);
 232                 IRC_WriteStrServersPrefixFlag_CB(Client, target, '\0',
 233                                                  cb_join_forward, str);
 234         }
 235
 236         /* tell users in this channel about the new client */
 237         IRC_WriteStrChannelPrefix(Client, chan, target, false,
 238                                   "JOIN :%s",  channame);
 239
 240         /* syncronize channel modes */
 241         if (modes[1]) {
 242                 IRC_WriteStrChannelPrefix(Client, chan, target, false,
 243                                           "MODE %s +%s %s", channame,
 244                                           &modes[1], Client_ID(target));
 245         }
 246 } /* join_forward */
 247
 248
 249 /**
 250  * Aknowledge user JOIN request and send "channel info" numerics.
 251  *
 252  * @param Client        Client used to prefix the genrated commands
 253  * @param target        Forward commands/numerics to this user
 254  * @param chan          Channel structure
 255  * @param channame      Channel name
 256  */
 257 static bool
 258 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 259                                         const char *channame)
 260 {
 261         const char *topic;
 262
 263         if (Client_Type(Client) != CLIENT_USER)
 264                 return true;
 265         /* acknowledge join */
 266         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 267                 return false;
 268
 269         /* Send topic to client, if any */
 270         topic = Channel_Topic(chan);
 271         assert(topic != NULL);
 272         if (*topic) {
 273                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 274                         Client_ID(Client), channame, topic))
 275                                 return false;
 276 #ifndef STRICT_RFC
 277                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 278                         Client_ID(Client), channame,
 279                         Channel_TopicWho(chan),
 280                         Channel_TopicTime(chan)))
 281                                 return false;
 282 #endif
 283         }
 284         /* send list of channel members to client */
 285         if (!IRC_Send_NAMES(Client, chan))
 286                 return false;
 287         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client),
 288                                   Channel_Name(chan));
 289 } /* join_send_topic */
 290
 291
 292 /**
 293  * Handler for the IRC "JOIN" command.
 294  *
 295  * See RFC 2812, 3.2.1 "Join message"; RFC 2813, 4.2.1 "Join message".
 296  *
 297  * @param Client        The client from which this command has been received
 298  * @param Req           Request structure with prefix and all parameters
 299  * @returns             CONNECTED or DISCONNECTED
 300  */
 301 GLOBAL bool
 302 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 303 {
 304         char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 305         CLIENT *target;
 306         CHANNEL *chan;
 307
 308         assert( Client != NULL );
 309         assert( Req != NULL );
 310
 311         /* Bad number of arguments? */
 312         if (Req->argc < 1 || Req->argc > 2)
 313                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 314                                           Client_ID(Client), Req->command);
 315
 316         /* Who is the sender? */
 317         if (Client_Type(Client) == CLIENT_SERVER)
 318                 target = Client_Search(Req->prefix);
 319         else
 320                 target = Client;
 321
 322         if (!target)
 323                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG, Client_ID(Client), Req->prefix);
 324
 325         /* Is argument "0"? */
 326         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 327                 return part_from_all_channels(Client, target);
 328
 329         /* Are channel keys given? */
 330         if (Req->argc > 1)
 331                 key = strtok_r(Req->argv[1], ",", &lastkey);
 332
 333         channame = Req->argv[0];
 334         channame = strtok_r(channame, ",", &lastchan);
 335
 336         /* Make sure that "channame" is not the empty string ("JOIN :") */
 337         if (! channame)
 338                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 339                                           Client_ID(Client), Req->command);
 340
 341         while (channame) {
 342                 flags = NULL;
 343
 344                 /* Did the server include channel-user-modes? */
 345                 if (Client_Type(Client) == CLIENT_SERVER) {
 346                         flags = strchr(channame, 0x7);
 347                         if (flags) {
 348                                 *flags = '\0';
 349                                 flags++;
 350                         }
 351                 }
 352
 353                 chan = Channel_Search(channame);
 354                 if (!chan && Conf_PredefChannelsOnly) {
 355                          /* channel must be created, but server does not allow this */
 356                         IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG, Client_ID(Client), channame);
 357                         break;
 358                 }
 359
 360                 /* Local client? */
 361                 if (Client_Type(Client) == CLIENT_USER) {
 362                         /* Test if the user has reached the channel limit */
 363                         if ((Conf_MaxJoins > 0) &&
 364                             (Channel_CountForUser(Client) >= Conf_MaxJoins))
 365                                 return IRC_WriteStrClient(Client,
 366                                                 ERR_TOOMANYCHANNELS_MSG,
 367                                                 Client_ID(Client), channame);
 368                         if (chan) {
 369                                 /* Already existing channel: check if the
 370                                  * client is allowed to join */
 371                                 if (!join_allowed(Client, chan, channame, key))
 372                                         break;
 373                         } else {
 374                                 /* New channel: first user will become channel
 375                                  * operator unless this is a modeless channel */
 376                                 if (*channame != '+')
 377                                         flags = "o";
 378                         }
 379
 380                         /* Local client: update idle time */
 381                         Conn_UpdateIdle(Client_Conn(Client));
 382                 } else {
 383                         /* Remote server: we don't need to know whether the
 384                          * client is invited or not, but we have to make sure
 385                          * that the "one shot" entries (generated by INVITE
 386                          * commands) in this list become deleted when a user
 387                          * joins a channel this way. */
 388                         if (chan)
 389                                 (void)Lists_Check(Channel_GetListInvites(chan),
 390                                                   target);
 391                 }
 392
 393                 /* Join channel (and create channel if it doesn't exist) */
 394                 if (!Channel_Join(target, channame))
 395                         break;
 396
 397                 if (!chan) { /* channel is new; it has been created above */
 398                         chan = Channel_Search(channame);
 399                         assert(chan != NULL);
 400                         if (Channel_IsModeless(chan)) {
 401                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 402                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 403                         }
 404                 }
 405                 assert(chan != NULL);
 406
 407                 join_set_channelmodes(chan, target, flags);
 408
 409                 join_forward(Client, target, chan, channame);
 410
 411                 if (!join_send_topic(Client, target, chan, channame))
 412                         break; /* write error */
 413
 414                 /* next channel? */
 415                 channame = strtok_r(NULL, ",", &lastchan);
 416                 if (channame && key)
 417                         key = strtok_r(NULL, ",", &lastkey);
 418         }
 419         return CONNECTED;
 420 } /* IRC_JOIN */
 421
 422
 423 /**
 424  * Handler for the IRC "PART" command.
 425  *
 426  * See RFC 2812, 3.2.2: "Part message".
 427  *
 428  * @param Client        The client from which this command has been received
 429  * @param Req           Request structure with prefix and all parameters
 430  * @returns             CONNECTED or DISCONNECTED
 431  */
 432 GLOBAL bool
 433 IRC_PART(CLIENT * Client, REQUEST * Req)
 434 {
 435         CLIENT *target;
 436         char *chan;
 437
 438         assert(Client != NULL);
 439         assert(Req != NULL);
 440
 441         if (Req->argc < 1 || Req->argc > 2)
 442                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 443                                           Client_ID(Client), Req->command);
 444
 445         /* Get the sender */
 446         if (Client_Type(Client) == CLIENT_SERVER)
 447                 target = Client_Search(Req->prefix);
 448         else
 449                 target = Client;
 450         if (!target)
 451                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 452                                           Client_ID(Client), Req->prefix);
 453
 454         /* Loop over all the given channel names */
 455         chan = strtok(Req->argv[0], ",");
 456
 457         /* Make sure that "chan" is not the empty string ("PART :") */
 458         if (! chan)
 459                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 460                                           Client_ID(Client), Req->command);
 461
 462         while (chan) {
 463                 Channel_Part(target, Client, chan,
 464                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 465                 chan = strtok(NULL, ",");
 466         }
 467
 468         /* Update idle time, if local client */
 469         if (Client_Conn(Client) > NONE)
 470                 Conn_UpdateIdle(Client_Conn(Client));
 471
 472         return CONNECTED;
 473 } /* IRC_PART */
 474
 475
 476 /**
 477  * Handler for the IRC "TOPIC" command.
 478  *
 479  * See RFC 2812, 3.2.4 "Topic message".
 480  *
 481  * @param Client        The client from which this command has been received
 482  * @param Req           Request structure with prefix and all parameters
 483  * @returns             CONNECTED or DISCONNECTED
 484  */
 485 GLOBAL bool
 486 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 487 {
 488         CHANNEL *chan;
 489         CLIENT *from;
 490         char *topic;
 491         bool onchannel, topicok, use_servermode, r;
 492
 493         assert( Client != NULL );
 494         assert( Req != NULL );
 495
 496         if (Req->argc < 1 || Req->argc > 2)
 497                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 498                                           Client_ID(Client), Req->command);
 499
 500         if (Client_Type(Client) == CLIENT_SERVER)
 501                 from = Client_Search(Req->prefix);
 502         else
 503                 from = Client;
 504
 505         if (!from)
 506                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 507                                           Client_ID(Client), Req->prefix);
 508
 509         chan = Channel_Search(Req->argv[0]);
 510         if (!chan)
 511                 return IRC_WriteStrClient(from, ERR_NOSUCHCHANNEL_MSG,
 512                                           Client_ID(from), Req->argv[0]);
 513
 514         Channel_CheckAdminRights(chan, Client, from,
 515                                  &onchannel, &topicok, &use_servermode);
 516
 517         if (!onchannel && !topicok)
 518                 return IRC_WriteStrClient(from, ERR_NOTONCHANNEL_MSG,
 519                                           Client_ID(from), Req->argv[0]);
 520
 521         if (Req->argc == 1) {
 522                 /* Request actual topic */
 523                 topic = Channel_Topic(chan);
 524                 if (*topic) {
 525                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 526                                                Client_ID(Client),
 527                                                Channel_Name(chan), topic);
 528 #ifndef STRICT_RFC
 529                         if (!r)
 530                                 return r;
 531                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 532                                                Client_ID(Client),
 533                                                Channel_Name(chan),
 534                                                Channel_TopicWho(chan),
 535                                                Channel_TopicTime(chan));
 536 #endif
 537                         return r;
 538                 }
 539                 else
 540                         return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 541                                                   Client_ID(from),
 542                                                   Channel_Name(chan));
 543         }
 544
 545         if (strchr(Channel_Modes(chan), 't')) {
 546                 /* Topic Lock. Is the user a channel or IRC operator? */
 547                 if (!topicok)
 548                         return IRC_WriteStrClient(from, ERR_CHANOPRIVSNEEDED_MSG,
 549                                                   Client_ID(from),
 550                                                   Channel_Name(chan));
 551         }
 552
 553         /* Set new topic */
 554         Channel_SetTopic(chan, from, Req->argv[1]);
 555         LogDebug("%s \"%s\" set topic on \"%s\": %s",
 556                  Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
 557                  Req->argv[1][0] ? Req->argv[1] : "<none>");
 558
 559         if (use_servermode)
 560                 from = Client_ThisServer();
 561
 562         /* Update channel and forward new topic to other servers */
 563         if (!Channel_IsLocal(chan))
 564                 IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
 565                                           Req->argv[0], Req->argv[1]);
 566         IRC_WriteStrChannelPrefix(Client, chan, from, false, "TOPIC %s :%s",
 567                                   Req->argv[0], Req->argv[1]);
 568
 569         if (Client_Type(Client) == CLIENT_USER)
 570                 return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
 571                                                 Req->argv[0], Req->argv[1]);
 572         else
 573                 return CONNECTED;
 574 } /* IRC_TOPIC */
 575
 576
 577 /**
 578  * Handler for the IRC "LIST" command.
 579  *
 580  * See RFC 2812, 3.2.6 "List message".
 581  *
 582  * This implementation handles the local case as well as the forwarding of the
 583  * LIST command to other servers in the IRC network.
 584  *
 585  * @param Client        The client from which this command has been received
 586  * @param Req           Request structure with prefix and all parameters
 587  * @returns             CONNECTED or DISCONNECTED
 588  */
 589 GLOBAL bool
 590 IRC_LIST( CLIENT *Client, REQUEST *Req )
 591 {
 592         char *pattern;
 593         CHANNEL *chan;
 594         CLIENT *from, *target;
 595
 596         assert( Client != NULL );
 597         assert( Req != NULL );
 598
 599         /* Bad number of prameters? */
 600         if( Req->argc > 2 )
 601                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
 602                         Client_ID( Client ), Req->command );
 603
 604         if( Req->argc > 0 )
 605                 pattern = strtok( Req->argv[0], "," );
 606         else
 607                 pattern = "*";
 608
 609         /* Get sender from prefix, if any */
 610         if( Client_Type( Client ) == CLIENT_SERVER )
 611                 from = Client_Search( Req->prefix );
 612         else
 613                 from = Client;
 614
 615         if( ! from )
 616                 return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG,
 617                                 Client_ID( Client ), Req->prefix );
 618
 619         if( Req->argc == 2 )
 620         {
 621                 /* Forward to other server? */
 622                 target = Client_Search( Req->argv[1] );
 623                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
 624                         return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG,
 625                                         Client_ID( Client ), Req->argv[1] );
 626
 627                 if( target != Client_ThisServer( ))
 628                 {
 629                         /* Target is indeed an other server, forward it! */
 630                         return IRC_WriteStrClientPrefix( target, from,
 631                                         "LIST %s :%s", Client_ID( from ),
 632                                         Req->argv[1] );
 633                 }
 634         }
 635
 636         while( pattern )
 637         {
 638                 /* Loop through all the channels */
 639                 chan = Channel_First( );
 640                 while( chan )
 641                 {
 642                         /* Check search pattern */
 643                         if( Match( pattern, Channel_Name( chan )))
 644                         {
 645                                 /* Gotcha! */
 646                                 if( ! strchr( Channel_Modes( chan ), 's' ) ||
 647                                     Channel_IsMemberOf( chan, from ))
 648                                 {
 649                                         if( ! IRC_WriteStrClient( from,
 650                                             RPL_LIST_MSG, Client_ID( from ),
 651                                             Channel_Name( chan ),
 652                                             Channel_MemberCount( chan ),
 653                                             Channel_Topic( chan )))
 654                                                 return DISCONNECTED;
 655                                 }
 656                         }
 657                         chan = Channel_Next( chan );
 658                 }
 659
 660                 /* Get next name ... */
 661                 if( Req->argc > 0 )
 662                         pattern = strtok( NULL, "," );
 663                 else
 664                         pattern = NULL;
 665         }
 666
 667         return IRC_WriteStrClient( from, RPL_LISTEND_MSG, Client_ID( from ));
 668 } /* IRC_LIST */
 669
 670
 671 /**
 672  * Handler for the IRC+ command "CHANINFO".
 673  *
 674  * See doc/Protocol.txt, section II.3:
 675  * "Exchange channel-modes, topics, and persistent channels".
 676  *
 677  * @param Client        The client from which this command has been received
 678  * @param Req           Request structure with prefix and all parameters
 679  * @returns             CONNECTED or DISCONNECTED
 680  */
 681 GLOBAL bool
 682 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 683 {
 684         char modes_add[COMMAND_LEN], l[16], *ptr;
 685         CLIENT *from;
 686         CHANNEL *chan;
 687         int arg_topic;
 688
 689         assert( Client != NULL );
 690         assert( Req != NULL );
 691
 692         /* Bad number of parameters? */
 693         if (Req->argc < 2 || Req->argc == 4 || Req->argc > 5)
 694                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 695                                           Client_ID(Client), Req->command);
 696
 697         /* Compatibility kludge */
 698         if( Req->argc == 5 ) arg_topic = 4;
 699         else if( Req->argc == 3 ) arg_topic = 2;
 700         else arg_topic = -1;
 701
 702         /* Search origin */
 703         from = Client_Search( Req->prefix );
 704         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 705
 706         /* Search or create channel */
 707         chan = Channel_Search( Req->argv[0] );
 708         if( ! chan ) chan = Channel_Create( Req->argv[0] );
 709         if( ! chan ) return CONNECTED;
 710
 711         if( Req->argv[1][0] == '+' )
 712         {
 713                 ptr = Channel_Modes( chan );
 714                 if( ! *ptr )
 715                 {
 716                         /* OK, this channel doesn't have modes jet, set the received ones: */
 717                         Channel_SetModes( chan, &Req->argv[1][1] );
 718
 719                         if( Req->argc == 5 )
 720                         {
 721                                 if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
 722                                 if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
 723                         }
 724                         else
 725                         {
 726                                 /* Delete modes which we never want to inherit */
 727                                 Channel_ModeDel( chan, 'l' );
 728                                 Channel_ModeDel( chan, 'k' );
 729                         }
 730
 731                         strcpy( modes_add, "" );
 732                         ptr = Channel_Modes( chan );
 733                         while( *ptr )
 734                         {
 735                                 if( *ptr == 'l' )
 736                                 {
 737                                         snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
 738                                         strlcat( modes_add, l, sizeof( modes_add ));
 739                                 }
 740                                 if( *ptr == 'k' )
 741                                 {
 742                                         strlcat( modes_add, " ", sizeof( modes_add ));
 743                                         strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
 744                                 }
 745                                 ptr++;
 746                         }
 747
 748                         /* Inform members of this channel */
 749                         IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
 750                 }
 751         }
 752         else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
 753
 754         if( arg_topic > 0 )
 755         {
 756                 /* We got a topic */
 757                 ptr = Channel_Topic( chan );
 758                 if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
 759                 {
 760                         /* OK, there is no topic jet */
 761                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 762                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 763                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 764                 }
 765         }
 766
 767         /* Forward CHANINFO to other serevrs */
 768         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] );
 769         else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
 770         else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
 771
 772         return CONNECTED;
 773 } /* IRC_CHANINFO */
 774
 775
 776 /* -eof- */