src/ngircd/irc-channel.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2013 Alexander Barton (alex@barton.de) and Contributors.
   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
  86         /* Allow IRC operators to overwrite channel limits */
  87         if (Client_HasMode(Client, 'o'))
  88                 return true;
  89
  90         is_banned = Lists_Check(Channel_GetListBans(chan), Client);
  91         is_exception = Lists_Check(Channel_GetListExcepts(chan), Client);
  92         is_invited = Lists_Check(Channel_GetListInvites(chan), Client);
  93
  94         if (is_banned && !is_invited && !is_exception) {
  95                 /* Client is banned from channel (and not on invite list) */
  96                 IRC_WriteErrClient(Client, ERR_BANNEDFROMCHAN_MSG,
  97                                    Client_ID(Client), channame);
  98                 return false;
  99         }
 100
 101         if (Channel_HasMode(chan, 'i') && !is_invited) {
 102                 /* Channel is "invite-only" and client is not on invite list */
 103                 IRC_WriteErrClient(Client, ERR_INVITEONLYCHAN_MSG,
 104                                    Client_ID(Client), channame);
 105                 return false;
 106         }
 107
 108         if (!Channel_CheckKey(chan, Client, key ? key : "")) {
 109                 /* Channel is protected by a channel key and the client
 110                  * didn't specify the correct one */
 111                 IRC_WriteErrClient(Client, ERR_BADCHANNELKEY_MSG,
 112                                    Client_ID(Client), channame);
 113                 return false;
 114         }
 115
 116         if (Channel_HasMode(chan, 'l') &&
 117             (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
 118                 /* There are more clints joined to this channel than allowed */
 119                 IRC_WriteErrClient(Client, ERR_CHANNELISFULL_MSG,
 120                                    Client_ID(Client), channame);
 121                 return false;
 122         }
 123
 124         if (Channel_HasMode(chan, 'z') && !Conn_UsesSSL(Client_Conn(Client))) {
 125                 /* Only "secure" clients are allowed, but clients doesn't
 126                  * use SSL encryption */
 127                 IRC_WriteErrClient(Client, ERR_SECURECHANNEL_MSG,
 128                                    Client_ID(Client), channame);
 129                 return false;
 130         }
 131
 132         if (Channel_HasMode(chan, 'O') && !Client_HasMode(Client, 'o')) {
 133                 /* Only IRC operators are allowed! */
 134                 IRC_WriteErrClient(Client, ERR_OPONLYCHANNEL_MSG,
 135                                    Client_ID(Client), channame);
 136                 return false;
 137         }
 138
 139         if (Channel_HasMode(chan, 'R') && !Client_HasMode(Client, 'R')) {
 140                 /* Only registered users are allowed! */
 141                 IRC_WriteErrClient(Client, ERR_REGONLYCHANNEL_MSG,
 142                                    Client_ID(Client), channame);
 143                 return false;
 144         }
 145
 146         return true;
 147 } /* join_allowed */
 148
 149 /**
 150  * Set user channel modes.
 151  *
 152  * @param chan          Channel
 153  * @param target        User to set modes for
 154  * @param flags         Channel modes to add
 155  */
 156 static void
 157 join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
 158 {
 159         if (flags) {
 160                 while (*flags) {
 161                         Channel_UserModeAdd(chan, target, *flags);
 162                         flags++;
 163                 }
 164         }
 165
 166         /* If the channel is persistent (+P) and client is an IRC op:
 167          * make client chanop, if not disabled in configuration. */
 168         if (Channel_HasMode(chan, 'P') && Conf_OperChanPAutoOp
 169             && Client_HasMode(target, 'o'))
 170                 Channel_UserModeAdd(chan, target, 'o');
 171 } /* join_set_channelmodes */
 172
 173 /**
 174  * Forward JOIN command to a specific server
 175  *
 176  * This function differentiates between servers using RFC 2813 mode that
 177  * support the JOIN command with appended ASCII 7 character and channel
 178  * modes, and servers using RFC 1459 protocol which require separate JOIN
 179  * and MODE commands.
 180  *
 181  * @param To            Forward JOIN (and MODE) command to this peer server
 182  * @param Prefix        Client used to prefix the genrated commands
 183  * @param Data          Parameters of JOIN command to forward, probably
 184  *                      containing channel modes separated by ASCII 7.
 185  */
 186 static void
 187 cb_join_forward(CLIENT *To, CLIENT *Prefix, void *Data)
 188 {
 189         CONN_ID conn;
 190         char str[COMMAND_LEN], *ptr = NULL;
 191
 192         strlcpy(str, (char *)Data, sizeof(str));
 193         conn = Client_Conn(To);
 194
 195         if (Conn_Options(conn) & CONN_RFC1459) {
 196                 /* RFC 1459 compatibility mode, appended modes are NOT
 197                  * supported, so strip them off! */
 198                 ptr = strchr(str, 0x7);
 199                 if (ptr)
 200                         *ptr++ = '\0';
 201         }
 202
 203         IRC_WriteStrClientPrefix(To, Prefix, "JOIN %s", str);
 204         if (ptr && *ptr)
 205                 IRC_WriteStrClientPrefix(To, Prefix, "MODE %s +%s %s", str, ptr,
 206                                          Client_ID(Prefix));
 207 } /* cb_join_forward */
 208
 209 /**
 210  * Forward JOIN command to all servers
 211  *
 212  * This function calls cb_join_forward(), which differentiates between
 213  * protocol implementations (e.g. RFC 2812, RFC 1459).
 214  *
 215  * @param Client        Client used to prefix the genrated commands
 216  * @param target        Forward JOIN (and MODE) command to this peer server
 217  * @param chan          Channel structure
 218  * @param channame      Channel name
 219  */
 220 static void
 221 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 222                                         const char *channame)
 223 {
 224         char modes[CHANNEL_MODE_LEN], str[COMMAND_LEN];
 225
 226         /* RFC 2813, 4.2.1: channel modes are separated from the channel
 227          * name with ASCII 7, if any, and not spaces: */
 228         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 229         if (modes[1])
 230                 modes[0] = 0x7;
 231         else
 232                 modes[0] = '\0';
 233
 234         /* forward to other servers (if it is not a local channel) */
 235         if (!Channel_IsLocal(chan)) {
 236                 snprintf(str, sizeof(str), "%s%s", channame, modes);
 237                 IRC_WriteStrServersPrefixFlag_CB(Client, target, '\0',
 238                                                  cb_join_forward, str);
 239         }
 240
 241         /* tell users in this channel about the new client */
 242         IRC_WriteStrChannelPrefix(Client, chan, target, false,
 243                                   "JOIN :%s",  channame);
 244
 245         /* synchronize channel modes */
 246         if (modes[1]) {
 247                 IRC_WriteStrChannelPrefix(Client, chan, target, false,
 248                                           "MODE %s +%s %s", channame,
 249                                           &modes[1], Client_ID(target));
 250         }
 251 } /* join_forward */
 252
 253 /**
 254  * Acknowledge user JOIN request and send "channel info" numerics.
 255  *
 256  * @param Client        Client used to prefix the genrated commands
 257  * @param target        Forward commands/numerics to this user
 258  * @param chan          Channel structure
 259  * @param channame      Channel name
 260  */
 261 static bool
 262 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 263                                         const char *channame)
 264 {
 265         const char *topic;
 266
 267         if (Client_Type(Client) != CLIENT_USER)
 268                 return true;
 269         /* acknowledge join */
 270         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 271                 return false;
 272
 273         /* Send topic to client, if any */
 274         topic = Channel_Topic(chan);
 275         assert(topic != NULL);
 276         if (*topic) {
 277                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 278                         Client_ID(Client), channame, topic))
 279                                 return false;
 280 #ifndef STRICT_RFC
 281                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 282                         Client_ID(Client), channame,
 283                         Channel_TopicWho(chan),
 284                         Channel_TopicTime(chan)))
 285                                 return false;
 286 #endif
 287         }
 288         /* send list of channel members to client */
 289         if (!IRC_Send_NAMES(Client, chan))
 290                 return false;
 291         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client),
 292                                   Channel_Name(chan));
 293 } /* join_send_topic */
 294
 295 /**
 296  * Handler for the IRC "JOIN" command.
 297  *
 298  * @param Client The client from which this command has been received.
 299  * @param Req Request structure with prefix and all parameters.
 300  * @return CONNECTED or DISCONNECTED.
 301  */
 302 GLOBAL bool
 303 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 304 {
 305         char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 306         CLIENT *target;
 307         CHANNEL *chan;
 308
 309         assert (Client != NULL);
 310         assert (Req != NULL);
 311
 312         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 313
 314         /* Is argument "0"? */
 315         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 316                 return part_from_all_channels(Client, target);
 317
 318         /* Are channel keys given? */
 319         if (Req->argc > 1)
 320                 key = strtok_r(Req->argv[1], ",", &lastkey);
 321
 322         channame = Req->argv[0];
 323         channame = strtok_r(channame, ",", &lastchan);
 324
 325         /* Make sure that "channame" is not the empty string ("JOIN :") */
 326         if (!channame)
 327                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 328                                           Client_ID(Client), Req->command);
 329
 330         while (channame) {
 331                 flags = NULL;
 332
 333                 /* Did the server include channel-user-modes? */
 334                 if (Client_Type(Client) == CLIENT_SERVER) {
 335                         flags = strchr(channame, 0x7);
 336                         if (flags) {
 337                                 *flags = '\0';
 338                                 flags++;
 339                         }
 340                 }
 341
 342                 chan = Channel_Search(channame);
 343
 344                 /* Local client? */
 345                 if (Client_Type(Client) == CLIENT_USER) {
 346                         if (chan) {
 347                                 /* Already existing channel: already member? */
 348                                 if (Channel_IsMemberOf(chan, Client))
 349                                     goto join_next;
 350                         } else {
 351                                 /* Channel must be created */
 352                                 if (!strchr(Conf_AllowedChannelTypes, channame[0])) {
 353                                         /* ... but channel type is not allowed! */
 354                                         IRC_WriteErrClient(Client,
 355                                                 ERR_NOSUCHCHANNEL_MSG,
 356                                                 Client_ID(Client), channame);
 357                                         goto join_next;
 358                                 }
 359                         }
 360
 361                         /* Test if the user has reached the channel limit */
 362                         if ((Conf_MaxJoins > 0) &&
 363                             (Channel_CountForUser(Client) >= Conf_MaxJoins)) {
 364                                 if (!IRC_WriteErrClient(Client,
 365                                                 ERR_TOOMANYCHANNELS_MSG,
 366                                                 Client_ID(Client), channame))
 367                                         return DISCONNECTED;
 368                                 goto join_next;
 369                         }
 370
 371                         if (chan) {
 372                                 /* Already existing channel: check if the
 373                                  * client is allowed to join */
 374                                 if (!join_allowed(Client, chan, channame, key))
 375                                         goto join_next;
 376                         } else {
 377                                 /* New channel: first user will become channel
 378                                  * operator unless this is a modeless channel */
 379                                 if (*channame != '+')
 380                                         flags = "o";
 381                         }
 382
 383                         /* Local client: update idle time */
 384                         Conn_UpdateIdle(Client_Conn(Client));
 385                 } else {
 386                         /* Remote server: we don't need to know whether the
 387                          * client is invited or not, but we have to make sure
 388                          * that the "one shot" entries (generated by INVITE
 389                          * commands) in this list become deleted when a user
 390                          * joins a channel this way. */
 391                         if (chan)
 392                                 (void)Lists_Check(Channel_GetListInvites(chan),
 393                                                   target);
 394                 }
 395
 396                 /* Join channel (and create channel if it doesn't exist) */
 397                 if (!Channel_Join(target, channame))
 398                         goto join_next;
 399
 400                 if (!chan) { /* channel is new; it has been created above */
 401                         chan = Channel_Search(channame);
 402                         assert(chan != NULL);
 403                         if (Channel_IsModeless(chan)) {
 404                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 405                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 406                         }
 407                 }
 408                 assert(chan != NULL);
 409
 410                 join_set_channelmodes(chan, target, flags);
 411
 412                 join_forward(Client, target, chan, channame);
 413
 414                 if (!join_send_topic(Client, target, chan, channame))
 415                         break; /* write error */
 416
 417         join_next:
 418                 /* next channel? */
 419                 channame = strtok_r(NULL, ",", &lastchan);
 420                 if (channame && key)
 421                         key = strtok_r(NULL, ",", &lastkey);
 422         }
 423         return CONNECTED;
 424 } /* IRC_JOIN */
 425
 426 /**
 427  * Handler for the IRC "PART" command.
 428  *
 429  * @param Client The client from which this command has been received.
 430  * @param Req Request structure with prefix and all parameters.
 431  * @return CONNECTED or DISCONNECTED.
 432  */
 433 GLOBAL bool
 434 IRC_PART(CLIENT * Client, REQUEST * Req)
 435 {
 436         CLIENT *target;
 437         char *chan;
 438
 439         assert(Client != NULL);
 440         assert(Req != NULL);
 441
 442         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 443
 444         /* Loop over all the given channel names */
 445         chan = strtok(Req->argv[0], ",");
 446
 447         /* Make sure that "chan" is not the empty string ("PART :") */
 448         if (!chan)
 449                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 450                                           Client_ID(Client), Req->command);
 451
 452         while (chan) {
 453                 Channel_Part(target, Client, chan,
 454                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 455                 chan = strtok(NULL, ",");
 456         }
 457
 458         /* Update idle time, if local client */
 459         if (Client_Conn(Client) > NONE)
 460                 Conn_UpdateIdle(Client_Conn(Client));
 461
 462         return CONNECTED;
 463 } /* IRC_PART */
 464
 465 /**
 466  * Handler for the IRC "TOPIC" command.
 467  *
 468  * @param Client The client from which this command has been received.
 469  * @param Req Request structure with prefix and all parameters.
 470  * @return CONNECTED or DISCONNECTED.
 471  */
 472 GLOBAL bool
 473 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 474 {
 475         CHANNEL *chan;
 476         CLIENT *from;
 477         char *topic;
 478         bool r, topic_power;
 479
 480         assert( Client != NULL );
 481         assert( Req != NULL );
 482
 483         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 484
 485         chan = Channel_Search(Req->argv[0]);
 486         if (!chan)
 487                 return IRC_WriteErrClient(from, ERR_NOSUCHCHANNEL_MSG,
 488                                           Client_ID(from), Req->argv[0]);
 489
 490         /* Only remote servers and channel members are allowed to change the
 491          * channel topic, and IRC operators when the Conf_OperCanMode option
 492          * is set in the server configuration. */
 493         if (Client_Type(Client) != CLIENT_SERVER) {
 494                 topic_power = Client_HasMode(from, 'o');
 495                 if (!Channel_IsMemberOf(chan, from)
 496                     && !(Conf_OperCanMode && topic_power))
 497                         return IRC_WriteErrClient(from, ERR_NOTONCHANNEL_MSG,
 498                                                   Client_ID(from), Req->argv[0]);
 499         } else
 500                 topic_power = true;
 501
 502         if (Req->argc == 1) {
 503                 /* Request actual topic */
 504                 topic = Channel_Topic(chan);
 505                 if (*topic) {
 506                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 507                                                Client_ID(Client),
 508                                                Channel_Name(chan), topic);
 509 #ifndef STRICT_RFC
 510                         if (!r)
 511                                 return r;
 512                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 513                                                Client_ID(Client),
 514                                                Channel_Name(chan),
 515                                                Channel_TopicWho(chan),
 516                                                Channel_TopicTime(chan));
 517 #endif
 518                         return r;
 519                 }
 520                 else
 521                         return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 522                                                   Client_ID(from),
 523                                                   Channel_Name(chan));
 524         }
 525
 526         if (Channel_HasMode(chan, 't')) {
 527                 /* Topic Lock. Is the user a channel op or IRC operator? */
 528                 if(!topic_power &&
 529                    !Channel_UserHasMode(chan, from, 'h') &&
 530                    !Channel_UserHasMode(chan, from, 'o') &&
 531                    !Channel_UserHasMode(chan, from, 'a') &&
 532                    !Channel_UserHasMode(chan, from, 'q'))
 533                         return IRC_WriteErrClient(from, ERR_CHANOPRIVSNEEDED_MSG,
 534                                                   Client_ID(from),
 535                                                   Channel_Name(chan));
 536         }
 537
 538         /* Set new topic */
 539         Channel_SetTopic(chan, from, Req->argv[1]);
 540         LogDebug("%s \"%s\" set topic on \"%s\": %s",
 541                  Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
 542                  Req->argv[1][0] ? Req->argv[1] : "<none>");
 543
 544         if (Conf_OperServerMode)
 545                 from = Client_ThisServer();
 546
 547         /* Update channel and forward new topic to other servers */
 548         if (!Channel_IsLocal(chan))
 549                 IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
 550                                           Req->argv[0], Req->argv[1]);
 551         IRC_WriteStrChannelPrefix(Client, chan, from, false, "TOPIC %s :%s",
 552                                   Req->argv[0], Req->argv[1]);
 553
 554         if (Client_Type(Client) == CLIENT_USER)
 555                 return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
 556                                                 Req->argv[0], Req->argv[1]);
 557         else
 558                 return CONNECTED;
 559 } /* IRC_TOPIC */
 560
 561 /**
 562  * Handler for the IRC "LIST" command.
 563  *
 564  * @param Client The client from which this command has been received.
 565  * @param Req Request structure with prefix and all parameters.
 566  * @return CONNECTED or DISCONNECTED.
 567  */
 568 GLOBAL bool
 569 IRC_LIST( CLIENT *Client, REQUEST *Req )
 570 {
 571         char *pattern;
 572         CHANNEL *chan;
 573         CLIENT *from, *target;
 574         int count = 0;
 575
 576         assert(Client != NULL);
 577         assert(Req != NULL);
 578
 579         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 580
 581         if (Req->argc > 0)
 582                 pattern = strtok(Req->argv[0], ",");
 583         else
 584                 pattern = "*";
 585
 586         if (Req->argc == 2) {
 587                 /* Forward to other server? */
 588                 target = Client_Search(Req->argv[1]);
 589                 if (! target || Client_Type(target) != CLIENT_SERVER)
 590                         return IRC_WriteErrClient(from, ERR_NOSUCHSERVER_MSG,
 591                                                   Client_ID(Client),
 592                                                   Req->argv[1]);
 593
 594                 if (target != Client_ThisServer()) {
 595                         /* Target is indeed an other server, forward it! */
 596                         return IRC_WriteStrClientPrefix(target, from,
 597                                                         "LIST %s :%s",
 598                                                         Req->argv[0],
 599                                                         Req->argv[1]);
 600                 }
 601         }
 602
 603         while (pattern) {
 604                 /* Loop through all the channels */
 605                 if (Req->argc > 0)
 606                         ngt_LowerStr(pattern);
 607                 chan = Channel_First();
 608                 while (chan) {
 609                         /* Check search pattern */
 610                         if (MatchCaseInsensitive(pattern, Channel_Name(chan))) {
 611                                 /* Gotcha! */
 612                                 if (!Channel_HasMode(chan, 's')
 613                                     || Channel_IsMemberOf(chan, from)
 614                                     || (!Conf_MorePrivacy
 615                                         && Client_HasMode(Client, 'o')
 616                                         && Client_Conn(Client) > NONE))
 617                                 {
 618                                         if ((Conf_MaxListSize > 0)
 619                                             && IRC_CheckListTooBig(from, count,
 620                                                                    Conf_MaxListSize,
 621                                                                    "LIST"))
 622                                                 break;
 623                                         if (!IRC_WriteStrClient(from,
 624                                              RPL_LIST_MSG, Client_ID(from),
 625                                              Channel_Name(chan),
 626                                              Channel_MemberCount(chan),
 627                                              Channel_Topic( chan )))
 628                                                 return DISCONNECTED;
 629                                         count++;
 630                                 }
 631                         }
 632                         chan = Channel_Next(chan);
 633                 }
 634
 635                 /* Get next name ... */
 636                 if(Req->argc > 0)
 637                         pattern = strtok(NULL, ",");
 638                 else
 639                         pattern = NULL;
 640         }
 641
 642         return IRC_WriteStrClient(from, RPL_LISTEND_MSG, Client_ID(from));
 643 } /* IRC_LIST */
 644
 645 /**
 646  * Handler for the IRC+ "CHANINFO" command.
 647  *
 648  * @param Client The client from which this command has been received.
 649  * @param Req Request structure with prefix and all parameters.
 650  * @return CONNECTED or DISCONNECTED.
 651  */
 652 GLOBAL bool
 653 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 654 {
 655         char modes_add[COMMAND_LEN], l[16];
 656         CLIENT *from;
 657         CHANNEL *chan;
 658         int arg_topic;
 659
 660         assert( Client != NULL );
 661         assert( Req != NULL );
 662
 663         /* Bad number of parameters? */
 664         if (Req->argc < 2 || Req->argc == 4 || Req->argc > 5)
 665                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 666                                           Client_ID(Client), Req->command);
 667
 668         /* Compatibility kludge */
 669         if (Req->argc == 5)
 670                 arg_topic = 4;
 671         else if(Req->argc == 3)
 672                 arg_topic = 2;
 673         else
 674                 arg_topic = -1;
 675
 676         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 677
 678         /* Search or create channel */
 679         chan = Channel_Search( Req->argv[0] );
 680         if (!chan)
 681                 chan = Channel_Create( Req->argv[0] );
 682         if (!chan)
 683                 return CONNECTED;
 684
 685         if (Req->argv[1][0] == '+') {
 686                 if (!*Channel_Modes(chan)) {
 687                         /* OK, this channel doesn't have modes yet,
 688                          * set the received ones: */
 689                         Channel_SetModes(chan, &Req->argv[1][1]);
 690
 691                         if(Req->argc == 5) {
 692                                 if(Channel_HasMode(chan, 'k'))
 693                                         Channel_SetKey(chan, Req->argv[2]);
 694                                 if(Channel_HasMode(chan, 'l'))
 695                                         Channel_SetMaxUsers(chan, atol(Req->argv[3]));
 696                         } else {
 697                                 /* Delete modes which we never want to inherit */
 698                                 Channel_ModeDel(chan, 'l');
 699                                 Channel_ModeDel(chan, 'k');
 700                         }
 701
 702                         strcpy(modes_add, "");
 703                         if (Channel_HasMode(chan, 'l'))  {
 704                                 snprintf(l, sizeof(l), " %lu",
 705                                          Channel_MaxUsers(chan));
 706                                 strlcat(modes_add, l, sizeof(modes_add));
 707                         }
 708                         if (Channel_HasMode(chan, 'k'))  {
 709                                 strlcat(modes_add, " ", sizeof(modes_add));
 710                                 strlcat(modes_add, Channel_Key(chan),
 711                                         sizeof(modes_add));
 712                         }
 713
 714                         /* Inform members of this channel */
 715                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 716                                                   "MODE %s +%s%s", Req->argv[0],
 717                                                   Channel_Modes(chan), modes_add);
 718                 }
 719         }
 720         else
 721                 Log(LOG_WARNING, "CHANINFO: invalid MODE format ignored!");
 722
 723         if (arg_topic > 0) {
 724                 /* We got a topic */
 725                 if (!*Channel_Topic(chan) && Req->argv[arg_topic][0]) {
 726                         /* OK, there is no topic jet */
 727                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 728                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 729                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 730                 }
 731         }
 732
 733         /* Forward CHANINFO to other servers */
 734         if (Req->argc == 5)
 735                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 736                                               "CHANINFO %s %s %s %s :%s",
 737                                               Req->argv[0], Req->argv[1],
 738                                               Req->argv[2], Req->argv[3],
 739                                               Req->argv[4]);
 740         else if (Req->argc == 3)
 741                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 742                                               "CHANINFO %s %s :%s",
 743                                               Req->argv[0], Req->argv[1],
 744                                               Req->argv[2]);
 745         else
 746                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 747                                               "CHANINFO %s %s",
 748                                               Req->argv[0], Req->argv[1]);
 749
 750         return CONNECTED;
 751 } /* IRC_CHANINFO */
 752
 753 /* -eof- */