src/ngircd/irc-channel.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2014 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 <assert.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "conn.h"
  25 #include "channel.h"
  26 #include "conn-func.h"
  27 #include "lists.h"
  28 #include "log.h"
  29 #include "match.h"
  30 #include "messages.h"
  31 #include "parse.h"
  32 #include "irc.h"
  33 #include "irc-info.h"
  34 #include "irc-macros.h"
  35 #include "irc-write.h"
  36 #include "conf.h"
  37
  38 #include "irc-channel.h"
  39
  40 /**
  41  * Part from all channels.
  42  *
  43  * RFC 2812, (3.2.1 Join message Command):
  44  *  Note that this message accepts a special argument ("0"), which is a
  45  *  special request to leave all channels the user is currently a member of.
  46  *  The server will process this message as if the user had sent a PART
  47  *  command (See Section 3.2.2) for each channel he is a member of.
  48  *
  49  * @param client        Client that initiated the part request
  50  * @param target        Client that should part all joined channels
  51  * @returns             CONNECTED or DISCONNECTED
  52  */
  53 static bool
  54 part_from_all_channels(CLIENT* client, CLIENT *target)
  55 {
  56         CL2CHAN *cl2chan;
  57         CHANNEL *chan;
  58
  59         while ((cl2chan = Channel_FirstChannelOf(target))) {
  60                 chan = Channel_GetChannel(cl2chan);
  61                 assert( chan != NULL );
  62                 Channel_Part(target, client, Channel_Name(chan), Client_ID(target));
  63         }
  64         return CONNECTED;
  65 } /* part_from_all_channels */
  66
  67 /**
  68  * Check weather a local client is allowed to join an already existing
  69  * channel or not.
  70  *
  71  * @param Client        Client that sent the JOIN command
  72  * @param chan          Channel to check
  73  * @param channame      Name of the channel
  74  * @param key           Provided channel key (or NULL)
  75  * @returns             true if client is allowed to join, false otherwise
  76  */
  77 static bool
  78 join_allowed(CLIENT *Client, CHANNEL *chan, const char *channame,
  79              const char *key)
  80 {
  81         bool is_invited, is_banned, is_exception;
  82
  83         /* Allow IRC operators to overwrite channel limits */
  84         if (Client_HasMode(Client, 'o'))
  85                 return true;
  86
  87         is_banned = Lists_Check(Channel_GetListBans(chan), Client);
  88         is_exception = Lists_Check(Channel_GetListExcepts(chan), Client);
  89         is_invited = Lists_Check(Channel_GetListInvites(chan), Client);
  90
  91         if (is_banned && !is_invited && !is_exception) {
  92                 /* Client is banned from channel (and not on invite list) */
  93                 IRC_WriteErrClient(Client, ERR_BANNEDFROMCHAN_MSG,
  94                                    Client_ID(Client), channame);
  95                 return false;
  96         }
  97
  98         if (Channel_HasMode(chan, 'i') && !is_invited) {
  99                 /* Channel is "invite-only" and client is not on invite list */
 100                 IRC_WriteErrClient(Client, ERR_INVITEONLYCHAN_MSG,
 101                                    Client_ID(Client), channame);
 102                 return false;
 103         }
 104
 105         if (!Channel_CheckKey(chan, Client, key ? key : "")) {
 106                 /* Channel is protected by a channel key and the client
 107                  * didn't specify the correct one */
 108                 IRC_WriteErrClient(Client, ERR_BADCHANNELKEY_MSG,
 109                                    Client_ID(Client), channame);
 110                 return false;
 111         }
 112
 113         if (Channel_HasMode(chan, 'l') &&
 114             (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
 115                 /* There are more clints joined to this channel than allowed */
 116                 IRC_WriteErrClient(Client, ERR_CHANNELISFULL_MSG,
 117                                    Client_ID(Client), channame);
 118                 return false;
 119         }
 120
 121         if (Channel_HasMode(chan, 'z') && !Conn_UsesSSL(Client_Conn(Client))) {
 122                 /* Only "secure" clients are allowed, but clients doesn't
 123                  * use SSL encryption */
 124                 IRC_WriteErrClient(Client, ERR_SECURECHANNEL_MSG,
 125                                    Client_ID(Client), channame);
 126                 return false;
 127         }
 128
 129         if (Channel_HasMode(chan, 'O') && !Client_HasMode(Client, 'o')) {
 130                 /* Only IRC operators are allowed! */
 131                 IRC_WriteErrClient(Client, ERR_OPONLYCHANNEL_MSG,
 132                                    Client_ID(Client), channame);
 133                 return false;
 134         }
 135
 136         if (Channel_HasMode(chan, 'R') && !Client_HasMode(Client, 'R')) {
 137                 /* Only registered users are allowed! */
 138                 IRC_WriteErrClient(Client, ERR_REGONLYCHANNEL_MSG,
 139                                    Client_ID(Client), channame);
 140                 return false;
 141         }
 142
 143         return true;
 144 } /* join_allowed */
 145
 146 /**
 147  * Set user channel modes.
 148  *
 149  * @param chan          Channel
 150  * @param target        User to set modes for
 151  * @param flags         Channel modes to add
 152  */
 153 static void
 154 join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
 155 {
 156         if (flags) {
 157                 while (*flags) {
 158                         Channel_UserModeAdd(chan, target, *flags);
 159                         flags++;
 160                 }
 161         }
 162
 163         /* If the channel is persistent (+P) and client is an IRC op:
 164          * make client chanop, if not disabled in configuration. */
 165         if (Channel_HasMode(chan, 'P') && Conf_OperChanPAutoOp
 166             && Client_HasMode(target, 'o'))
 167                 Channel_UserModeAdd(chan, target, 'o');
 168 } /* join_set_channelmodes */
 169
 170 /**
 171  * Forward JOIN command to a specific server
 172  *
 173  * This function differentiates between servers using RFC 2813 mode that
 174  * support the JOIN command with appended ASCII 7 character and channel
 175  * modes, and servers using RFC 1459 protocol which require separate JOIN
 176  * and MODE commands.
 177  *
 178  * @param To            Forward JOIN (and MODE) command to this peer server
 179  * @param Prefix        Client used to prefix the genrated commands
 180  * @param Data          Parameters of JOIN command to forward, probably
 181  *                      containing channel modes separated by ASCII 7.
 182  */
 183 static void
 184 cb_join_forward(CLIENT *To, CLIENT *Prefix, void *Data)
 185 {
 186         CONN_ID conn;
 187         char str[COMMAND_LEN], *ptr = NULL;
 188
 189         strlcpy(str, (char *)Data, sizeof(str));
 190         conn = Client_Conn(To);
 191
 192         if (Conn_Options(conn) & CONN_RFC1459) {
 193                 /* RFC 1459 compatibility mode, appended modes are NOT
 194                  * supported, so strip them off! */
 195                 ptr = strchr(str, 0x7);
 196                 if (ptr)
 197                         *ptr++ = '\0';
 198         }
 199
 200         IRC_WriteStrClientPrefix(To, Prefix, "JOIN %s", str);
 201         if (ptr && *ptr)
 202                 IRC_WriteStrClientPrefix(To, Prefix, "MODE %s +%s %s", str, ptr,
 203                                          Client_ID(Prefix));
 204 } /* cb_join_forward */
 205
 206 /**
 207  * Forward JOIN command to all servers
 208  *
 209  * This function calls cb_join_forward(), which differentiates between
 210  * protocol implementations (e.g. RFC 2812, RFC 1459).
 211  *
 212  * @param Client        Client used to prefix the genrated commands
 213  * @param target        Forward JOIN (and MODE) command to this peer server
 214  * @param chan          Channel structure
 215  * @param channame      Channel name
 216  */
 217 static void
 218 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 219                                         const char *channame)
 220 {
 221         char modes[CHANNEL_MODE_LEN], str[COMMAND_LEN];
 222
 223         /* RFC 2813, 4.2.1: channel modes are separated from the channel
 224          * name with ASCII 7, if any, and not spaces: */
 225         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 226         if (modes[1])
 227                 modes[0] = 0x7;
 228         else
 229                 modes[0] = '\0';
 230
 231         /* forward to other servers (if it is not a local channel) */
 232         if (!Channel_IsLocal(chan)) {
 233                 snprintf(str, sizeof(str), "%s%s", channame, modes);
 234                 IRC_WriteStrServersPrefixFlag_CB(Client, target, '\0',
 235                                                  cb_join_forward, str);
 236         }
 237
 238         /* tell users in this channel about the new client */
 239         IRC_WriteStrChannelPrefix(Client, chan, target, false,
 240                                   "JOIN :%s",  channame);
 241
 242         /* synchronize channel modes */
 243         if (modes[1]) {
 244                 IRC_WriteStrChannelPrefix(Client, chan, target, false,
 245                                           "MODE %s +%s %s", channame,
 246                                           &modes[1], Client_ID(target));
 247         }
 248 } /* join_forward */
 249
 250 /**
 251  * Acknowledge user JOIN request and send "channel info" numerics.
 252  *
 253  * @param Client        Client used to prefix the genrated commands
 254  * @param target        Forward commands/numerics to this user
 255  * @param chan          Channel structure
 256  * @param channame      Channel name
 257  */
 258 static bool
 259 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 260                                         const char *channame)
 261 {
 262         const char *topic;
 263
 264         if (Client_Type(Client) != CLIENT_USER)
 265                 return true;
 266         /* acknowledge join */
 267         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 268                 return false;
 269
 270         /* Send topic to client, if any */
 271         topic = Channel_Topic(chan);
 272         assert(topic != NULL);
 273         if (*topic) {
 274                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 275                         Client_ID(Client), channame, topic))
 276                                 return false;
 277 #ifndef STRICT_RFC
 278                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 279                         Client_ID(Client), channame,
 280                         Channel_TopicWho(chan),
 281                         Channel_TopicTime(chan)))
 282                                 return false;
 283 #endif
 284         }
 285         /* send list of channel members to client */
 286         if (!IRC_Send_NAMES(Client, chan))
 287                 return false;
 288         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client),
 289                                   Channel_Name(chan));
 290 } /* join_send_topic */
 291
 292 /**
 293  * Handler for the IRC "JOIN" command.
 294  *
 295  * @param Client The client from which this command has been received.
 296  * @param Req Request structure with prefix and all parameters.
 297  * @return CONNECTED or DISCONNECTED.
 298  */
 299 GLOBAL bool
 300 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 301 {
 302         char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 303         CLIENT *target;
 304         CHANNEL *chan;
 305
 306         assert (Client != NULL);
 307         assert (Req != NULL);
 308
 309         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 310
 311         /* Is argument "0"? */
 312         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 313                 return part_from_all_channels(Client, target);
 314
 315         /* Are channel keys given? */
 316         if (Req->argc > 1)
 317                 key = strtok_r(Req->argv[1], ",", &lastkey);
 318
 319         channame = Req->argv[0];
 320         channame = strtok_r(channame, ",", &lastchan);
 321
 322         /* Make sure that "channame" is not the empty string ("JOIN :") */
 323         if (!channame)
 324                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 325                                           Client_ID(Client), Req->command);
 326
 327         while (channame) {
 328                 flags = NULL;
 329
 330                 /* Did the server include channel-user-modes? */
 331                 if (Client_Type(Client) == CLIENT_SERVER) {
 332                         flags = strchr(channame, 0x7);
 333                         if (flags) {
 334                                 *flags = '\0';
 335                                 flags++;
 336                         }
 337                 }
 338
 339                 chan = Channel_Search(channame);
 340
 341                 /* Local client? */
 342                 if (Client_Type(Client) == CLIENT_USER) {
 343                         if (chan) {
 344                                 /* Already existing channel: already member? */
 345                                 if (Channel_IsMemberOf(chan, Client))
 346                                     goto join_next;
 347                         } else {
 348                                 /* Channel must be created */
 349                                 if (!strchr(Conf_AllowedChannelTypes, channame[0])) {
 350                                         /* ... but channel type is not allowed! */
 351                                         IRC_WriteErrClient(Client,
 352                                                 ERR_NOSUCHCHANNEL_MSG,
 353                                                 Client_ID(Client), channame);
 354                                         goto join_next;
 355                                 }
 356                         }
 357
 358                         /* Test if the user has reached the channel limit */
 359                         if ((Conf_MaxJoins > 0) &&
 360                             (Channel_CountForUser(Client) >= Conf_MaxJoins)) {
 361                                 if (!IRC_WriteErrClient(Client,
 362                                                 ERR_TOOMANYCHANNELS_MSG,
 363                                                 Client_ID(Client), channame))
 364                                         return DISCONNECTED;
 365                                 goto join_next;
 366                         }
 367
 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                                         goto join_next;
 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                         goto join_next;
 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         join_next:
 415                 /* next channel? */
 416                 channame = strtok_r(NULL, ",", &lastchan);
 417                 if (channame && key)
 418                         key = strtok_r(NULL, ",", &lastkey);
 419         }
 420         return CONNECTED;
 421 } /* IRC_JOIN */
 422
 423 /**
 424  * Handler for the IRC "PART" command.
 425  *
 426  * @param Client The client from which this command has been received.
 427  * @param Req Request structure with prefix and all parameters.
 428  * @return CONNECTED or DISCONNECTED.
 429  */
 430 GLOBAL bool
 431 IRC_PART(CLIENT * Client, REQUEST * Req)
 432 {
 433         CLIENT *target;
 434         char *chan;
 435
 436         assert(Client != NULL);
 437         assert(Req != NULL);
 438
 439         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 440
 441         /* Loop over all the given channel names */
 442         chan = strtok(Req->argv[0], ",");
 443
 444         /* Make sure that "chan" is not the empty string ("PART :") */
 445         if (!chan)
 446                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 447                                           Client_ID(Client), Req->command);
 448
 449         while (chan) {
 450                 Channel_Part(target, Client, chan,
 451                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 452                 chan = strtok(NULL, ",");
 453         }
 454
 455         /* Update idle time, if local client */
 456         if (Client_Conn(Client) > NONE)
 457                 Conn_UpdateIdle(Client_Conn(Client));
 458
 459         return CONNECTED;
 460 } /* IRC_PART */
 461
 462 /**
 463  * Handler for the IRC "TOPIC" command.
 464  *
 465  * @param Client The client from which this command has been received.
 466  * @param Req Request structure with prefix and all parameters.
 467  * @return CONNECTED or DISCONNECTED.
 468  */
 469 GLOBAL bool
 470 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 471 {
 472         CHANNEL *chan;
 473         CLIENT *from;
 474         char *topic;
 475         bool r, topic_power;
 476
 477         assert( Client != NULL );
 478         assert( Req != NULL );
 479
 480         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 481
 482         chan = Channel_Search(Req->argv[0]);
 483         if (!chan)
 484                 return IRC_WriteErrClient(from, ERR_NOSUCHCHANNEL_MSG,
 485                                           Client_ID(from), Req->argv[0]);
 486
 487         /* Only remote servers and channel members are allowed to change the
 488          * channel topic, and IRC operators when the Conf_OperCanMode option
 489          * is set in the server configuration. */
 490         if (Client_Type(Client) != CLIENT_SERVER) {
 491                 topic_power = Client_HasMode(from, 'o');
 492                 if (!Channel_IsMemberOf(chan, from)
 493                     && !(Conf_OperCanMode && topic_power))
 494                         return IRC_WriteErrClient(from, ERR_NOTONCHANNEL_MSG,
 495                                                   Client_ID(from), Req->argv[0]);
 496         } else
 497                 topic_power = true;
 498
 499         if (Req->argc == 1) {
 500                 /* Request actual topic */
 501                 topic = Channel_Topic(chan);
 502                 if (*topic) {
 503                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 504                                                Client_ID(Client),
 505                                                Channel_Name(chan), topic);
 506 #ifndef STRICT_RFC
 507                         if (!r)
 508                                 return r;
 509                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 510                                                Client_ID(Client),
 511                                                Channel_Name(chan),
 512                                                Channel_TopicWho(chan),
 513                                                Channel_TopicTime(chan));
 514 #endif
 515                         return r;
 516                 }
 517                 else
 518                         return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 519                                                   Client_ID(from),
 520                                                   Channel_Name(chan));
 521         }
 522
 523         if (Channel_HasMode(chan, 't')) {
 524                 /* Topic Lock. Is the user a channel op or IRC operator? */
 525                 if(!topic_power &&
 526                    !Channel_UserHasMode(chan, from, 'h') &&
 527                    !Channel_UserHasMode(chan, from, 'o') &&
 528                    !Channel_UserHasMode(chan, from, 'a') &&
 529                    !Channel_UserHasMode(chan, from, 'q'))
 530                         return IRC_WriteErrClient(from, ERR_CHANOPRIVSNEEDED_MSG,
 531                                                   Client_ID(from),
 532                                                   Channel_Name(chan));
 533         }
 534
 535         /* Set new topic */
 536         Channel_SetTopic(chan, from, Req->argv[1]);
 537         LogDebug("%s \"%s\" set topic on \"%s\": %s",
 538                  Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
 539                  Req->argv[1][0] ? Req->argv[1] : "<none>");
 540
 541         if (Conf_OperServerMode)
 542                 from = Client_ThisServer();
 543
 544         /* Update channel and forward new topic to other servers */
 545         if (!Channel_IsLocal(chan))
 546                 IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
 547                                           Req->argv[0], Req->argv[1]);
 548         IRC_WriteStrChannelPrefix(Client, chan, from, false, "TOPIC %s :%s",
 549                                   Req->argv[0], Req->argv[1]);
 550
 551         if (Client_Type(Client) == CLIENT_USER)
 552                 return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
 553                                                 Req->argv[0], Req->argv[1]);
 554         else
 555                 return CONNECTED;
 556 } /* IRC_TOPIC */
 557
 558 /**
 559  * Handler for the IRC "LIST" command.
 560  *
 561  * @param Client The client from which this command has been received.
 562  * @param Req Request structure with prefix and all parameters.
 563  * @return CONNECTED or DISCONNECTED.
 564  */
 565 GLOBAL bool
 566 IRC_LIST( CLIENT *Client, REQUEST *Req )
 567 {
 568         char *pattern;
 569         CHANNEL *chan;
 570         CLIENT *from, *target;
 571         int count = 0;
 572
 573         assert(Client != NULL);
 574         assert(Req != NULL);
 575
 576         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 577
 578         if (Req->argc > 0)
 579                 pattern = strtok(Req->argv[0], ",");
 580         else
 581                 pattern = "*";
 582
 583         if (Req->argc == 2) {
 584                 /* Forward to other server? */
 585                 target = Client_Search(Req->argv[1]);
 586                 if (! target || Client_Type(target) != CLIENT_SERVER)
 587                         return IRC_WriteErrClient(from, ERR_NOSUCHSERVER_MSG,
 588                                                   Client_ID(Client),
 589                                                   Req->argv[1]);
 590
 591                 if (target != Client_ThisServer()) {
 592                         /* Target is indeed an other server, forward it! */
 593                         return IRC_WriteStrClientPrefix(target, from,
 594                                                         "LIST %s :%s",
 595                                                         Req->argv[0],
 596                                                         Req->argv[1]);
 597                 }
 598         }
 599
 600         while (pattern) {
 601                 /* Loop through all the channels */
 602                 if (Req->argc > 0)
 603                         ngt_LowerStr(pattern);
 604                 chan = Channel_First();
 605                 while (chan) {
 606                         /* Check search pattern */
 607                         if (MatchCaseInsensitive(pattern, Channel_Name(chan))) {
 608                                 /* Gotcha! */
 609                                 if (!Channel_HasMode(chan, 's')
 610                                     || Channel_IsMemberOf(chan, from)
 611                                     || (!Conf_MorePrivacy
 612                                         && Client_HasMode(Client, 'o')
 613                                         && Client_Conn(Client) > NONE))
 614                                 {
 615                                         if ((Conf_MaxListSize > 0)
 616                                             && IRC_CheckListTooBig(from, count,
 617                                                                    Conf_MaxListSize,
 618                                                                    "LIST"))
 619                                                 break;
 620                                         if (!IRC_WriteStrClient(from,
 621                                              RPL_LIST_MSG, Client_ID(from),
 622                                              Channel_Name(chan),
 623                                              Channel_MemberCount(chan),
 624                                              Channel_Topic( chan )))
 625                                                 return DISCONNECTED;
 626                                         count++;
 627                                 }
 628                         }
 629                         chan = Channel_Next(chan);
 630                 }
 631
 632                 /* Get next name ... */
 633                 if(Req->argc > 0)
 634                         pattern = strtok(NULL, ",");
 635                 else
 636                         pattern = NULL;
 637         }
 638
 639         return IRC_WriteStrClient(from, RPL_LISTEND_MSG, Client_ID(from));
 640 } /* IRC_LIST */
 641
 642 /**
 643  * Handler for the IRC+ "CHANINFO" command.
 644  *
 645  * @param Client The client from which this command has been received.
 646  * @param Req Request structure with prefix and all parameters.
 647  * @return CONNECTED or DISCONNECTED.
 648  */
 649 GLOBAL bool
 650 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 651 {
 652         char modes_add[COMMAND_LEN], l[16];
 653         CLIENT *from;
 654         CHANNEL *chan;
 655         int arg_topic;
 656
 657         assert( Client != NULL );
 658         assert( Req != NULL );
 659
 660         /* Bad number of parameters? */
 661         if (Req->argc < 2 || Req->argc == 4 || Req->argc > 5)
 662                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 663                                           Client_ID(Client), Req->command);
 664
 665         /* Compatibility kludge */
 666         if (Req->argc == 5)
 667                 arg_topic = 4;
 668         else if(Req->argc == 3)
 669                 arg_topic = 2;
 670         else
 671                 arg_topic = -1;
 672
 673         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 674
 675         /* Search or create channel */
 676         chan = Channel_Search( Req->argv[0] );
 677         if (!chan)
 678                 chan = Channel_Create( Req->argv[0] );
 679         if (!chan)
 680                 return CONNECTED;
 681
 682         if (Req->argv[1][0] == '+') {
 683                 if (!*Channel_Modes(chan)) {
 684                         /* OK, this channel doesn't have modes yet,
 685                          * set the received ones: */
 686                         Channel_SetModes(chan, &Req->argv[1][1]);
 687
 688                         if(Req->argc == 5) {
 689                                 if(Channel_HasMode(chan, 'k'))
 690                                         Channel_SetKey(chan, Req->argv[2]);
 691                                 if(Channel_HasMode(chan, 'l'))
 692                                         Channel_SetMaxUsers(chan, atol(Req->argv[3]));
 693                         } else {
 694                                 /* Delete modes which we never want to inherit */
 695                                 Channel_ModeDel(chan, 'l');
 696                                 Channel_ModeDel(chan, 'k');
 697                         }
 698
 699                         strcpy(modes_add, "");
 700                         if (Channel_HasMode(chan, 'l'))  {
 701                                 snprintf(l, sizeof(l), " %lu",
 702                                          Channel_MaxUsers(chan));
 703                                 strlcat(modes_add, l, sizeof(modes_add));
 704                         }
 705                         if (Channel_HasMode(chan, 'k'))  {
 706                                 strlcat(modes_add, " ", sizeof(modes_add));
 707                                 strlcat(modes_add, Channel_Key(chan),
 708                                         sizeof(modes_add));
 709                         }
 710
 711                         /* Inform members of this channel */
 712                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 713                                                   "MODE %s +%s%s", Req->argv[0],
 714                                                   Channel_Modes(chan), modes_add);
 715                 }
 716         }
 717         else
 718                 Log(LOG_WARNING, "CHANINFO: invalid MODE format ignored!");
 719
 720         if (arg_topic > 0) {
 721                 /* We got a topic */
 722                 if (!*Channel_Topic(chan) && Req->argv[arg_topic][0]) {
 723                         /* OK, there is no topic jet */
 724                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 725                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 726                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 727                 }
 728         }
 729
 730         /* Forward CHANINFO to other servers */
 731         if (Req->argc == 5)
 732                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 733                                               "CHANINFO %s %s %s %s :%s",
 734                                               Req->argv[0], Req->argv[1],
 735                                               Req->argv[2], Req->argv[3],
 736                                               Req->argv[4]);
 737         else if (Req->argc == 3)
 738                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 739                                               "CHANINFO %s %s :%s",
 740                                               Req->argv[0], Req->argv[1],
 741                                               Req->argv[2]);
 742         else
 743                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 744                                               "CHANINFO %s %s",
 745                                               Req->argv[0], Req->argv[1]);
 746
 747         return CONNECTED;
 748 } /* IRC_CHANINFO */
 749
 750 /* -eof- */