src/ngircd/irc-channel.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2013 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.h"
  35 #include "irc-info.h"
  36 #include "irc-macros.h"
  37 #include "irc-write.h"
  38 #include "conf.h"
  39
  40 #include "exp.h"
  41 #include "irc-channel.h"
  42
  43 /**
  44  * Part from all channels.
  45  *
  46  * RFC 2812, (3.2.1 Join message Command):
  47  *  Note that this message accepts a special argument ("0"), which is a
  48  *  special request to leave all channels the user is currently a member of.
  49  *  The server will process this message as if the user had sent a PART
  50  *  command (See Section 3.2.2) for each channel he is a member of.
  51  *
  52  * @param client        Client that initiated the part request
  53  * @param target        Client that should part all joined channels
  54  * @returns             CONNECTED or DISCONNECTED
  55  */
  56 static bool
  57 part_from_all_channels(CLIENT* client, CLIENT *target)
  58 {
  59         CL2CHAN *cl2chan;
  60         CHANNEL *chan;
  61
  62         while ((cl2chan = Channel_FirstChannelOf(target))) {
  63                 chan = Channel_GetChannel(cl2chan);
  64                 assert( chan != NULL );
  65                 Channel_Part(target, client, Channel_Name(chan), Client_ID(target));
  66         }
  67         return CONNECTED;
  68 } /* part_from_all_channels */
  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, is_exception;
  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_exception = Lists_Check(Channel_GetListExcepts(chan), Client);
  93         is_invited = Lists_Check(Channel_GetListInvites(chan), Client);
  94
  95         if (is_banned && !is_invited && !is_exception) {
  96                 /* Client is banned from channel (and not on invite list) */
  97                 IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG,
  98                                    Client_ID(Client), channame);
  99                 return false;
 100         }
 101
 102         channel_modes = Channel_Modes(chan);
 103         if (strchr(channel_modes, 'i') && !is_invited) {
 104                 /* Channel is "invite-only" and client is not on invite list */
 105                 IRC_WriteStrClient(Client, ERR_INVITEONLYCHAN_MSG,
 106                                    Client_ID(Client), channame);
 107                 return false;
 108         }
 109
 110         if (!Channel_CheckKey(chan, Client, key ? key : "")) {
 111                 /* Channel is protected by a channel key and the client
 112                  * didn't specify the correct one */
 113                 IRC_WriteStrClient(Client, ERR_BADCHANNELKEY_MSG,
 114                                    Client_ID(Client), channame);
 115                 return false;
 116         }
 117
 118         if (strchr(channel_modes, 'l') &&
 119             (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
 120                 /* There are more clints joined to this channel than allowed */
 121                 IRC_WriteStrClient(Client, ERR_CHANNELISFULL_MSG,
 122                                    Client_ID(Client), channame);
 123                 return false;
 124         }
 125
 126         if (strchr(channel_modes, 'z') && !Conn_UsesSSL(Client_Conn(Client))) {
 127                 /* Only "secure" clients are allowed, but clients doesn't
 128                  * use SSL encryption */
 129                 IRC_WriteStrClient(Client, ERR_SECURECHANNEL_MSG,
 130                                    Client_ID(Client), channame);
 131                 return false;
 132         }
 133
 134         if (strchr(channel_modes, 'O') && !Client_OperByMe(Client)) {
 135                 /* Only IRC operators are allowed! */
 136                 IRC_WriteStrClient(Client, ERR_OPONLYCHANNEL_MSG,
 137                                    Client_ID(Client), channame);
 138                 return false;
 139         }
 140
 141         if (strchr(channel_modes, 'R') && !strchr(Client_Modes(Client), 'R')) {
 142                 /* Only registered users are allowed! */
 143                 IRC_WriteStrClient(Client, ERR_REGONLYCHANNEL_MSG,
 144                                    Client_ID(Client), channame);
 145                 return false;
 146         }
 147
 148         return true;
 149 } /* join_allowed */
 150
 151 /**
 152  * Set user channel modes.
 153  *
 154  * @param chan          Channel
 155  * @param target        User to set modes for
 156  * @param flags         Channel modes to add
 157  */
 158 static void
 159 join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
 160 {
 161         if (flags) {
 162                 while (*flags) {
 163                         Channel_UserModeAdd(chan, target, *flags);
 164                         flags++;
 165                 }
 166         }
 167
 168         /* If the channel is persistent (+P) and client is an IRC op:
 169          * make client chanop, if not disabled in configuration. */
 170         if (strchr(Channel_Modes(chan), 'P') && Conf_OperChanPAutoOp
 171             && strchr(Client_Modes(target), 'o'))
 172                 Channel_UserModeAdd(chan, target, 'o');
 173 } /* join_set_channelmodes */
 174
 175 /**
 176  * Forward JOIN command to a specific server
 177  *
 178  * This function differentiates between servers using RFC 2813 mode that
 179  * support the JOIN command with appended ASCII 7 character and channel
 180  * modes, and servers using RFC 1459 protocol which require separate JOIN
 181  * and MODE commands.
 182  *
 183  * @param To            Forward JOIN (and MODE) command to this peer server
 184  * @param Prefix        Client used to prefix the genrated commands
 185  * @param Data          Parameters of JOIN command to forward, probably
 186  *                      containing channel modes separated by ASCII 7.
 187  */
 188 static void
 189 cb_join_forward(CLIENT *To, CLIENT *Prefix, void *Data)
 190 {
 191         CONN_ID conn;
 192         char str[COMMAND_LEN], *ptr = NULL;
 193
 194         strlcpy(str, (char *)Data, sizeof(str));
 195         conn = Client_Conn(To);
 196
 197         if (Conn_Options(conn) & CONN_RFC1459) {
 198                 /* RFC 1459 compatibility mode, appended modes are NOT
 199                  * supported, so strip them off! */
 200                 ptr = strchr(str, 0x7);
 201                 if (ptr)
 202                         *ptr++ = '\0';
 203         }
 204
 205         IRC_WriteStrClientPrefix(To, Prefix, "JOIN %s", str);
 206         if (ptr && *ptr)
 207                 IRC_WriteStrClientPrefix(To, Prefix, "MODE %s +%s %s", str, ptr,
 208                                          Client_ID(Prefix));
 209 } /* cb_join_forward */
 210
 211 /**
 212  * Forward JOIN command to all servers
 213  *
 214  * This function calls cb_join_forward(), which differentiates between
 215  * protocol implementations (e.g. RFC 2812, RFC 1459).
 216  *
 217  * @param Client        Client used to prefix the genrated commands
 218  * @param target        Forward JOIN (and MODE) command to this peer server
 219  * @param chan          Channel structure
 220  * @param channame      Channel name
 221  */
 222 static void
 223 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 224                                         const char *channame)
 225 {
 226         char modes[CHANNEL_MODE_LEN], str[COMMAND_LEN];
 227
 228         /* RFC 2813, 4.2.1: channel modes are separated from the channel
 229          * name with ASCII 7, if any, and not spaces: */
 230         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 231         if (modes[1])
 232                 modes[0] = 0x7;
 233         else
 234                 modes[0] = '\0';
 235
 236         /* forward to other servers (if it is not a local channel) */
 237         if (!Channel_IsLocal(chan)) {
 238                 snprintf(str, sizeof(str), "%s%s", channame, modes);
 239                 IRC_WriteStrServersPrefixFlag_CB(Client, target, '\0',
 240                                                  cb_join_forward, str);
 241         }
 242
 243         /* tell users in this channel about the new client */
 244         IRC_WriteStrChannelPrefix(Client, chan, target, false,
 245                                   "JOIN :%s",  channame);
 246
 247         /* synchronize channel modes */
 248         if (modes[1]) {
 249                 IRC_WriteStrChannelPrefix(Client, chan, target, false,
 250                                           "MODE %s +%s %s", channame,
 251                                           &modes[1], Client_ID(target));
 252         }
 253 } /* join_forward */
 254
 255 /**
 256  * Acknowledge user JOIN request and send "channel info" numerics.
 257  *
 258  * @param Client        Client used to prefix the genrated commands
 259  * @param target        Forward commands/numerics to this user
 260  * @param chan          Channel structure
 261  * @param channame      Channel name
 262  */
 263 static bool
 264 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 265                                         const char *channame)
 266 {
 267         const char *topic;
 268
 269         if (Client_Type(Client) != CLIENT_USER)
 270                 return true;
 271         /* acknowledge join */
 272         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 273                 return false;
 274
 275         /* Send topic to client, if any */
 276         topic = Channel_Topic(chan);
 277         assert(topic != NULL);
 278         if (*topic) {
 279                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 280                         Client_ID(Client), channame, topic))
 281                                 return false;
 282 #ifndef STRICT_RFC
 283                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 284                         Client_ID(Client), channame,
 285                         Channel_TopicWho(chan),
 286                         Channel_TopicTime(chan)))
 287                                 return false;
 288 #endif
 289         }
 290         /* send list of channel members to client */
 291         if (!IRC_Send_NAMES(Client, chan))
 292                 return false;
 293         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client),
 294                                   Channel_Name(chan));
 295 } /* join_send_topic */
 296
 297 /**
 298  * Handler for the IRC "JOIN" command.
 299  *
 300  * @param Client The client from which this command has been received.
 301  * @param Req Request structure with prefix and all parameters.
 302  * @return CONNECTED or DISCONNECTED.
 303  */
 304 GLOBAL bool
 305 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 306 {
 307         char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 308         CLIENT *target;
 309         CHANNEL *chan;
 310
 311         assert (Client != NULL);
 312         assert (Req != NULL);
 313
 314         _IRC_ARGC_GE_OR_RETURN_(Client, Req, 1)
 315         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 316         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 317
 318         /* Is argument "0"? */
 319         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 320                 return part_from_all_channels(Client, target);
 321
 322         /* Are channel keys given? */
 323         if (Req->argc > 1)
 324                 key = strtok_r(Req->argv[1], ",", &lastkey);
 325
 326         channame = Req->argv[0];
 327         channame = strtok_r(channame, ",", &lastchan);
 328
 329         /* Make sure that "channame" is not the empty string ("JOIN :") */
 330         if (! channame)
 331                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 332                                           Client_ID(Client), Req->command);
 333
 334         while (channame) {
 335                 flags = NULL;
 336
 337                 /* Did the server include channel-user-modes? */
 338                 if (Client_Type(Client) == CLIENT_SERVER) {
 339                         flags = strchr(channame, 0x7);
 340                         if (flags) {
 341                                 *flags = '\0';
 342                                 flags++;
 343                         }
 344                 }
 345
 346                 chan = Channel_Search(channame);
 347                 if (!chan && !strchr(Conf_AllowedChannelTypes, channame[0])) {
 348                          /* channel must be created, but forbidden by config */
 349                         IRC_WriteStrClient(Client, ERR_NOSUCHCHANNEL_MSG,
 350                                            Client_ID(Client), channame);
 351                         goto join_next;
 352                 }
 353
 354                 /* Local client? */
 355                 if (Client_Type(Client) == CLIENT_USER) {
 356                         if (chan) {
 357                                 /* Already existing channel: already member? */
 358                                 if (Channel_IsMemberOf(chan, Client))
 359                                     goto join_next;
 360                         }
 361
 362                         /* Test if the user has reached the channel limit */
 363                         if ((Conf_MaxJoins > 0) &&
 364                             (Channel_CountForUser(Client) >= Conf_MaxJoins)) {
 365                                 if (!IRC_WriteStrClient(Client,
 366                                                 ERR_TOOMANYCHANNELS_MSG,
 367                                                 Client_ID(Client), channame))
 368                                         return DISCONNECTED;
 369                                 goto join_next;
 370                         }
 371
 372                         if (chan) {
 373                                 /* Already existing channel: check if the
 374                                  * client is allowed to join */
 375                                 if (!join_allowed(Client, chan, channame, key))
 376                                         goto join_next;
 377                         } else {
 378                                 /* New channel: first user will become channel
 379                                  * operator unless this is a modeless channel */
 380                                 if (*channame != '+')
 381                                         flags = "o";
 382                         }
 383
 384                         /* Local client: update idle time */
 385                         Conn_UpdateIdle(Client_Conn(Client));
 386                 } else {
 387                         /* Remote server: we don't need to know whether the
 388                          * client is invited or not, but we have to make sure
 389                          * that the "one shot" entries (generated by INVITE
 390                          * commands) in this list become deleted when a user
 391                          * joins a channel this way. */
 392                         if (chan)
 393                                 (void)Lists_Check(Channel_GetListInvites(chan),
 394                                                   target);
 395                 }
 396
 397                 /* Join channel (and create channel if it doesn't exist) */
 398                 if (!Channel_Join(target, channame))
 399                         goto join_next;
 400
 401                 if (!chan) { /* channel is new; it has been created above */
 402                         chan = Channel_Search(channame);
 403                         assert(chan != NULL);
 404                         if (Channel_IsModeless(chan)) {
 405                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 406                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 407                         }
 408                 }
 409                 assert(chan != NULL);
 410
 411                 join_set_channelmodes(chan, target, flags);
 412
 413                 join_forward(Client, target, chan, channame);
 414
 415                 if (!join_send_topic(Client, target, chan, channame))
 416                         break; /* write error */
 417
 418         join_next:
 419                 /* next channel? */
 420                 channame = strtok_r(NULL, ",", &lastchan);
 421                 if (channame && key)
 422                         key = strtok_r(NULL, ",", &lastkey);
 423         }
 424         return CONNECTED;
 425 } /* IRC_JOIN */
 426
 427 /**
 428  * Handler for the IRC "PART" command.
 429  *
 430  * @param Client The client from which this command has been received.
 431  * @param Req Request structure with prefix and all parameters.
 432  * @return CONNECTED or DISCONNECTED.
 433  */
 434 GLOBAL bool
 435 IRC_PART(CLIENT * Client, REQUEST * Req)
 436 {
 437         CLIENT *target;
 438         char *chan;
 439
 440         assert(Client != NULL);
 441         assert(Req != NULL);
 442
 443         _IRC_ARGC_GE_OR_RETURN_(Client, Req, 1)
 444         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 445         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 446
 447         /* Loop over all the given channel names */
 448         chan = strtok(Req->argv[0], ",");
 449
 450         /* Make sure that "chan" is not the empty string ("PART :") */
 451         if (! chan)
 452                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 453                                           Client_ID(Client), Req->command);
 454
 455         while (chan) {
 456                 Channel_Part(target, Client, chan,
 457                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 458                 chan = strtok(NULL, ",");
 459         }
 460
 461         /* Update idle time, if local client */
 462         if (Client_Conn(Client) > NONE)
 463                 Conn_UpdateIdle(Client_Conn(Client));
 464
 465         return CONNECTED;
 466 } /* IRC_PART */
 467
 468 /**
 469  * Handler for the IRC "TOPIC" command.
 470  *
 471  * @param Client The client from which this command has been received.
 472  * @param Req Request structure with prefix and all parameters.
 473  * @return CONNECTED or DISCONNECTED.
 474  */
 475 GLOBAL bool
 476 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 477 {
 478         CHANNEL *chan;
 479         CLIENT *from;
 480         char *topic;
 481         bool r, topic_power;
 482
 483         assert( Client != NULL );
 484         assert( Req != NULL );
 485
 486         IRC_SetPenalty(Client, 1);
 487
 488         _IRC_ARGC_GE_OR_RETURN_(Client, Req, 1)
 489         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 490         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 491
 492         chan = Channel_Search(Req->argv[0]);
 493         if (!chan)
 494                 return IRC_WriteStrClient(from, ERR_NOSUCHCHANNEL_MSG,
 495                                           Client_ID(from), Req->argv[0]);
 496
 497         /* Only remote servers and channel members are allowed to change the
 498          * channel topic, and IRC operators when the Conf_OperCanMode option
 499          * is set in the server configuration. */
 500         if (Client_Type(Client) != CLIENT_SERVER) {
 501                 topic_power = Client_HasMode(from, 'o');
 502                 if (!Channel_IsMemberOf(chan, from)
 503                     && !(Conf_OperCanMode && topic_power))
 504                         return IRC_WriteStrClient(from, ERR_NOTONCHANNEL_MSG,
 505                                                   Client_ID(from), Req->argv[0]);
 506         } else
 507                 topic_power = true;
 508
 509         if (Req->argc == 1) {
 510                 /* Request actual topic */
 511                 topic = Channel_Topic(chan);
 512                 if (*topic) {
 513                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 514                                                Client_ID(Client),
 515                                                Channel_Name(chan), topic);
 516 #ifndef STRICT_RFC
 517                         if (!r)
 518                                 return r;
 519                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 520                                                Client_ID(Client),
 521                                                Channel_Name(chan),
 522                                                Channel_TopicWho(chan),
 523                                                Channel_TopicTime(chan));
 524 #endif
 525                         return r;
 526                 }
 527                 else
 528                         return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 529                                                   Client_ID(from),
 530                                                   Channel_Name(chan));
 531         }
 532
 533         if (strchr(Channel_Modes(chan), 't')) {
 534                 /* Topic Lock. Is the user a channel op or IRC operator? */
 535                 if(!topic_power &&
 536                    !strchr(Channel_UserModes(chan, from), 'h') &&
 537                    !strchr(Channel_UserModes(chan, from), 'o') &&
 538                    !strchr(Channel_UserModes(chan, from), 'a') &&
 539                    !strchr(Channel_UserModes(chan, from), 'q'))
 540                         return IRC_WriteStrClient(from, ERR_CHANOPRIVSNEEDED_MSG,
 541                                                   Client_ID(from),
 542                                                   Channel_Name(chan));
 543         }
 544
 545         /* Set new topic */
 546         Channel_SetTopic(chan, from, Req->argv[1]);
 547         LogDebug("%s \"%s\" set topic on \"%s\": %s",
 548                  Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
 549                  Req->argv[1][0] ? Req->argv[1] : "<none>");
 550
 551         if (Conf_OperServerMode)
 552                 from = Client_ThisServer();
 553
 554         /* Update channel and forward new topic to other servers */
 555         if (!Channel_IsLocal(chan))
 556                 IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
 557                                           Req->argv[0], Req->argv[1]);
 558         IRC_WriteStrChannelPrefix(Client, chan, from, false, "TOPIC %s :%s",
 559                                   Req->argv[0], Req->argv[1]);
 560
 561         if (Client_Type(Client) == CLIENT_USER)
 562                 return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
 563                                                 Req->argv[0], Req->argv[1]);
 564         else
 565                 return CONNECTED;
 566 } /* IRC_TOPIC */
 567
 568 /**
 569  * Handler for the IRC "LIST" command.
 570  *
 571  * @param Client The client from which this command has been received.
 572  * @param Req Request structure with prefix and all parameters.
 573  * @return CONNECTED or DISCONNECTED.
 574  */
 575 GLOBAL bool
 576 IRC_LIST( CLIENT *Client, REQUEST *Req )
 577 {
 578         char *pattern;
 579         CHANNEL *chan;
 580         CLIENT *from, *target;
 581         int count = 0;
 582
 583         assert(Client != NULL);
 584         assert(Req != NULL);
 585
 586         IRC_SetPenalty(Client, 2);
 587
 588         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 2)
 589         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 590
 591         if (Req->argc > 0)
 592                 pattern = strtok(Req->argv[0], ",");
 593         else
 594                 pattern = "*";
 595
 596         if (Req->argc == 2) {
 597                 /* Forward to other server? */
 598                 target = Client_Search(Req->argv[1]);
 599                 if (! target || Client_Type(target) != CLIENT_SERVER)
 600                         return IRC_WriteStrClient(from, ERR_NOSUCHSERVER_MSG,
 601                                                   Client_ID(Client),
 602                                                   Req->argv[1]);
 603
 604                 if (target != Client_ThisServer()) {
 605                         /* Target is indeed an other server, forward it! */
 606                         return IRC_WriteStrClientPrefix(target, from,
 607                                                         "LIST %s :%s",
 608                                                         Req->argv[0],
 609                                                         Req->argv[1]);
 610                 }
 611         }
 612
 613         while (pattern) {
 614                 /* Loop through all the channels */
 615                 if (Req->argc > 0)
 616                         ngt_LowerStr(pattern);
 617                 chan = Channel_First();
 618                 while (chan) {
 619                         /* Check search pattern */
 620                         if (MatchCaseInsensitive(pattern, Channel_Name(chan))) {
 621                                 /* Gotcha! */
 622                                 if (!strchr(Channel_Modes(chan), 's')
 623                                     || Channel_IsMemberOf(chan, from)
 624                                     || (!Conf_MorePrivacy && Client_OperByMe(Client))) {
 625                                         if ((Conf_MaxListSize > 0)
 626                                             && IRC_CheckListTooBig(from, count,
 627                                                                    Conf_MaxListSize,
 628                                                                    "LIST"))
 629                                                 break;
 630                                         if (!IRC_WriteStrClient(from,
 631                                              RPL_LIST_MSG, Client_ID(from),
 632                                              Channel_Name(chan),
 633                                              Channel_MemberCount(chan),
 634                                              Channel_Topic( chan )))
 635                                                 return DISCONNECTED;
 636                                         count++;
 637                                 }
 638                         }
 639                         chan = Channel_Next(chan);
 640                 }
 641
 642                 /* Get next name ... */
 643                 if(Req->argc > 0)
 644                         pattern = strtok(NULL, ",");
 645                 else
 646                         pattern = NULL;
 647         }
 648
 649         return IRC_WriteStrClient(from, RPL_LISTEND_MSG, Client_ID(from));
 650 } /* IRC_LIST */
 651
 652 /**
 653  * Handler for the IRC+ "CHANINFO" command.
 654  *
 655  * @param Client The client from which this command has been received.
 656  * @param Req Request structure with prefix and all parameters.
 657  * @return CONNECTED or DISCONNECTED.
 658  */
 659 GLOBAL bool
 660 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 661 {
 662         char modes_add[COMMAND_LEN], l[16], *ptr;
 663         CLIENT *from;
 664         CHANNEL *chan;
 665         int arg_topic;
 666
 667         assert( Client != NULL );
 668         assert( Req != NULL );
 669
 670         /* Bad number of parameters? */
 671         if (Req->argc < 2 || Req->argc == 4 || Req->argc > 5)
 672                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 673                                           Client_ID(Client), Req->command);
 674
 675         /* Compatibility kludge */
 676         if (Req->argc == 5)
 677                 arg_topic = 4;
 678         else if(Req->argc == 3)
 679                 arg_topic = 2;
 680         else
 681                 arg_topic = -1;
 682
 683         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 684
 685         /* Search or create channel */
 686         chan = Channel_Search( Req->argv[0] );
 687         if (!chan)
 688                 chan = Channel_Create( Req->argv[0] );
 689         if (!chan)
 690                 return CONNECTED;
 691
 692         if (Req->argv[1][0] == '+') {
 693                 ptr = Channel_Modes(chan);
 694                 if (!*ptr) {
 695                         /* OK, this channel doesn't have modes jet,
 696                          * set the received ones: */
 697                         Channel_SetModes(chan, &Req->argv[1][1]);
 698
 699                         if(Req->argc == 5) {
 700                                 if(strchr(Channel_Modes(chan), 'k'))
 701                                         Channel_SetKey(chan, Req->argv[2]);
 702                                 if(strchr(Channel_Modes(chan), 'l'))
 703                                         Channel_SetMaxUsers(chan, atol(Req->argv[3]));
 704                         } else {
 705                                 /* Delete modes which we never want to inherit */
 706                                 Channel_ModeDel(chan, 'l');
 707                                 Channel_ModeDel(chan, 'k');
 708                         }
 709
 710                         strcpy(modes_add, "");
 711                         ptr = Channel_Modes(chan);
 712                         while (*ptr) {
 713                                 if (*ptr == 'l') {
 714                                         snprintf(l, sizeof(l), " %lu",
 715                                                  Channel_MaxUsers(chan));
 716                                         strlcat(modes_add, l,
 717                                                 sizeof(modes_add));
 718                                 }
 719                                 if (*ptr == 'k') {
 720                                         strlcat(modes_add, " ",
 721                                                 sizeof(modes_add));
 722                                         strlcat(modes_add, Channel_Key(chan),
 723                                                 sizeof(modes_add));
 724                                 }
 725                                 ptr++;
 726                         }
 727
 728                         /* Inform members of this channel */
 729                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 730                                                   "MODE %s +%s%s", Req->argv[0],
 731                                                   Channel_Modes(chan), modes_add);
 732                 }
 733         }
 734         else
 735                 Log(LOG_WARNING, "CHANINFO: invalid MODE format ignored!");
 736
 737         if (arg_topic > 0) {
 738                 /* We got a topic */
 739                 ptr = Channel_Topic( chan );
 740                 if (!*ptr && Req->argv[arg_topic][0]) {
 741                         /* OK, there is no topic jet */
 742                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 743                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 744                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 745                 }
 746         }
 747
 748         /* Forward CHANINFO to other servers */
 749         if (Req->argc == 5)
 750                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 751                                               "CHANINFO %s %s %s %s :%s",
 752                                               Req->argv[0], Req->argv[1],
 753                                               Req->argv[2], Req->argv[3],
 754                                               Req->argv[4]);
 755         else if (Req->argc == 3)
 756                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 757                                               "CHANINFO %s %s :%s",
 758                                               Req->argv[0], Req->argv[1],
 759                                               Req->argv[2]);
 760         else
 761                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 762                                               "CHANINFO %s %s",
 763                                               Req->argv[0], Req->argv[1]);
 764
 765         return CONNECTED;
 766 } /* IRC_CHANINFO */
 767
 768 /* -eof- */