src/ngircd/irc-channel.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2018 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 generated 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 generated 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  * Send channel TOPIC and NAMES list to a newly (N)JOIN'ed client.
 252  *
 253  * @param Client        Client used to prefix the generated commands
 254  * @param Chan          Channel structure
 255  */
 256 GLOBAL bool
 257 IRC_Send_Channel_Info(CLIENT *Client, CHANNEL *Chan)
 258 {
 259         const char *topic;
 260
 261         /* Send the topic (if any) to the new client: */
 262         topic = Channel_Topic(Chan);
 263         assert(topic != NULL);
 264         if (*topic) {
 265                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 266                         Client_ID(Client), Channel_Name(Chan), topic))
 267                                 return false;
 268 #ifndef STRICT_RFC
 269                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 270                         Client_ID(Client), Channel_Name(Chan),
 271                         Channel_TopicWho(Chan),
 272                         Channel_TopicTime(Chan)))
 273                                 return false;
 274 #endif
 275         }
 276
 277         /* Send list of channel members to the new client: */
 278         if (!IRC_Send_NAMES(Client, Chan))
 279                 return false;
 280         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG,
 281                                   Client_ID(Client), Channel_Name(Chan));
 282 }
 283
 284 /**
 285  * Handler for the IRC "JOIN" command.
 286  *
 287  * @param Client The client from which this command has been received.
 288  * @param Req Request structure with prefix and all parameters.
 289  * @return CONNECTED or DISCONNECTED.
 290  */
 291 GLOBAL bool
 292 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 293 {
 294         char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 295         CLIENT *target;
 296         CHANNEL *chan;
 297
 298         assert (Client != NULL);
 299         assert (Req != NULL);
 300
 301         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 302
 303         /* Is argument "0"? */
 304         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 305                 return part_from_all_channels(Client, target);
 306
 307         /* Are channel keys given? */
 308         if (Req->argc > 1)
 309                 key = strtok_r(Req->argv[1], ",", &lastkey);
 310
 311         channame = Req->argv[0];
 312         channame = strtok_r(channame, ",", &lastchan);
 313
 314         /* Make sure that "channame" is not the empty string ("JOIN :") */
 315         if (!channame)
 316                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 317                                           Client_ID(Client), Req->command);
 318
 319         while (channame) {
 320                 flags = NULL;
 321
 322                 /* Did the server include channel-user-modes? */
 323                 if (Client_Type(Client) == CLIENT_SERVER) {
 324                         flags = strchr(channame, 0x7);
 325                         if (flags) {
 326                                 *flags = '\0';
 327                                 flags++;
 328                         }
 329                 }
 330
 331                 chan = Channel_Search(channame);
 332
 333                 /* Local client? */
 334                 if (Client_Type(Client) == CLIENT_USER) {
 335                         if (chan) {
 336                                 /* Already existing channel: already member? */
 337                                 if (Channel_IsMemberOf(chan, Client))
 338                                     goto join_next;
 339                         } else {
 340                                 /* Channel must be created */
 341                                 if (!strchr(Conf_AllowedChannelTypes, channame[0])) {
 342                                         /* ... but channel type is not allowed! */
 343                                         IRC_WriteErrClient(Client,
 344                                                 ERR_NOSUCHCHANNEL_MSG,
 345                                                 Client_ID(Client), channame);
 346                                         goto join_next;
 347                                 }
 348                         }
 349
 350                         /* Test if the user has reached the channel limit */
 351                         if ((Conf_MaxJoins > 0) &&
 352                             (Channel_CountForUser(Client) >= Conf_MaxJoins)) {
 353                                 if (!IRC_WriteErrClient(Client,
 354                                                 ERR_TOOMANYCHANNELS_MSG,
 355                                                 Client_ID(Client), channame))
 356                                         return DISCONNECTED;
 357                                 goto join_next;
 358                         }
 359
 360                         if (chan) {
 361                                 /* Already existing channel: check if the
 362                                  * client is allowed to join */
 363                                 if (!join_allowed(Client, chan, channame, key))
 364                                         goto join_next;
 365                         } else {
 366                                 /* New channel: first user will become channel
 367                                  * operator unless this is a modeless channel */
 368                                 if (*channame != '+')
 369                                         flags = "o";
 370                         }
 371
 372                         /* Local client: update idle time */
 373                         Conn_UpdateIdle(Client_Conn(Client));
 374                 } else {
 375                         /* Remote server: we don't need to know whether the
 376                          * client is invited or not, but we have to make sure
 377                          * that the "one shot" entries (generated by INVITE
 378                          * commands) in this list become deleted when a user
 379                          * joins a channel this way. */
 380                         if (chan)
 381                                 (void)Lists_Check(Channel_GetListInvites(chan),
 382                                                   target);
 383                 }
 384
 385                 /* Join channel (and create channel if it doesn't exist) */
 386                 if (!Channel_Join(target, channame))
 387                         goto join_next;
 388
 389                 if (!chan) { /* channel is new; it has been created above */
 390                         chan = Channel_Search(channame);
 391                         assert(chan != NULL);
 392                         if (Channel_IsModeless(chan)) {
 393                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 394                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 395                         }
 396                 }
 397                 assert(chan != NULL);
 398
 399                 join_set_channelmodes(chan, target, flags);
 400
 401                 join_forward(Client, target, chan, channame);
 402
 403                 if (Client_Type(Client) == CLIENT_USER) {
 404                         /* Acknowledge join ... */
 405                         if (!IRC_WriteStrClientPrefix(Client, target,
 406                                                       "JOIN :%s", channame))
 407                                 break; /* write error */
 408                         /* ... and greet new user: */
 409                         if (!IRC_Send_Channel_Info(Client, chan))
 410                                 break; /* write error */
 411                 }
 412
 413         join_next:
 414                 /* next channel? */
 415                 channame = strtok_r(NULL, ",", &lastchan);
 416                 if (channame && key)
 417                         key = strtok_r(NULL, ",", &lastkey);
 418         }
 419         return CONNECTED;
 420 } /* IRC_JOIN */
 421
 422 /**
 423  * Handler for the IRC "PART" command.
 424  *
 425  * @param Client The client from which this command has been received.
 426  * @param Req Request structure with prefix and all parameters.
 427  * @return CONNECTED or DISCONNECTED.
 428  */
 429 GLOBAL bool
 430 IRC_PART(CLIENT * Client, REQUEST * Req)
 431 {
 432         CLIENT *target;
 433         char *chan;
 434
 435         assert(Client != NULL);
 436         assert(Req != NULL);
 437
 438         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 439
 440         /* Loop over all the given channel names */
 441         chan = strtok(Req->argv[0], ",");
 442
 443         /* Make sure that "chan" is not the empty string ("PART :") */
 444         if (!chan)
 445                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 446                                           Client_ID(Client), Req->command);
 447
 448         while (chan) {
 449                 Channel_Part(target, Client, chan,
 450                              Req->argc > 1 ? Req->argv[1] : "");
 451                 chan = strtok(NULL, ",");
 452         }
 453
 454         /* Update idle time, if local client */
 455         if (Client_Conn(Client) > NONE)
 456                 Conn_UpdateIdle(Client_Conn(Client));
 457
 458         return CONNECTED;
 459 } /* IRC_PART */
 460
 461 /**
 462  * Handler for the IRC "TOPIC" command.
 463  *
 464  * @param Client The client from which this command has been received.
 465  * @param Req Request structure with prefix and all parameters.
 466  * @return CONNECTED or DISCONNECTED.
 467  */
 468 GLOBAL bool
 469 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 470 {
 471         CHANNEL *chan;
 472         CLIENT *from;
 473         char *topic;
 474         bool r, topic_power;
 475
 476         assert( Client != NULL );
 477         assert( Req != NULL );
 478
 479         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 480
 481         chan = Channel_Search(Req->argv[0]);
 482         if (!chan)
 483                 return IRC_WriteErrClient(from, ERR_NOSUCHCHANNEL_MSG,
 484                                           Client_ID(from), Req->argv[0]);
 485
 486         /* Only remote servers and channel members are allowed to change the
 487          * channel topic, and IRC operators when the Conf_OperCanMode option
 488          * is set in the server configuration. */
 489         if (Client_Type(Client) != CLIENT_SERVER) {
 490                 topic_power = Client_HasMode(from, 'o');
 491                 if (!Channel_IsMemberOf(chan, from)
 492                     && !(Conf_OperCanMode && topic_power))
 493                         return IRC_WriteErrClient(from, ERR_NOTONCHANNEL_MSG,
 494                                                   Client_ID(from), Req->argv[0]);
 495         } else
 496                 topic_power = true;
 497
 498         if (Req->argc == 1) {
 499                 /* Request current topic */
 500                 topic = Channel_Topic(chan);
 501                 if (*topic) {
 502                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 503                                                Client_ID(Client),
 504                                                Channel_Name(chan), topic);
 505 #ifndef STRICT_RFC
 506                         if (!r)
 507                                 return r;
 508                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 509                                                Client_ID(Client),
 510                                                Channel_Name(chan),
 511                                                Channel_TopicWho(chan),
 512                                                Channel_TopicTime(chan));
 513 #endif
 514                         return r;
 515                 }
 516                 else
 517                         return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 518                                                   Client_ID(from),
 519                                                   Channel_Name(chan));
 520         }
 521
 522         if (Channel_HasMode(chan, 't')) {
 523                 /* Topic Lock. Is the user a channel op or IRC operator? */
 524                 if(!topic_power &&
 525                    !Channel_UserHasMode(chan, from, 'h') &&
 526                    !Channel_UserHasMode(chan, from, 'o') &&
 527                    !Channel_UserHasMode(chan, from, 'a') &&
 528                    !Channel_UserHasMode(chan, from, 'q'))
 529                         return IRC_WriteErrClient(from, ERR_CHANOPRIVSNEEDED_MSG,
 530                                                   Client_ID(from),
 531                                                   Channel_Name(chan));
 532         }
 533
 534         LogDebug("%s \"%s\" set topic on \"%s\": %s",
 535                  Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
 536                  Req->argv[1][0] ? Req->argv[1] : "<none>");
 537
 538         if (Conf_OperServerMode)
 539                 from = Client_ThisServer();
 540
 541         /* Update channel and forward new topic to other servers */
 542         if (!Channel_IsLocal(chan))
 543                 IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
 544                                           Req->argv[0], Req->argv[1]);
 545
 546         /* Infrom local clients, but only when the topic really changed. */
 547         if (strcmp(Req->argv[1], Channel_Topic(chan)) != 0)
 548                 IRC_WriteStrChannelPrefix(Client, chan, from, false,
 549                                             "TOPIC %s :%s", Req->argv[0],
 550                                             Req->argv[1]);
 551
 552         /* Update topic, setter, and timestamp. */
 553         Channel_SetTopic(chan, from, Req->argv[1]);
 554
 555         /* Send confirmation when the local client is a user. */
 556         if (Client_Type(Client) == CLIENT_USER)
 557                 return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
 558                                                 Req->argv[0], Req->argv[1]);
 559         else
 560                 return CONNECTED;
 561 } /* IRC_TOPIC */
 562
 563 /**
 564  * Handler for the IRC "LIST" command.
 565  *
 566  * @param Client The client from which this command has been received.
 567  * @param Req Request structure with prefix and all parameters.
 568  * @return CONNECTED or DISCONNECTED.
 569  */
 570 GLOBAL bool
 571 IRC_LIST( CLIENT *Client, REQUEST *Req )
 572 {
 573         char *pattern;
 574         CHANNEL *chan;
 575         CLIENT *from, *target;
 576         int count = 0;
 577
 578         assert(Client != NULL);
 579         assert(Req != NULL);
 580
 581         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 582
 583         if (Req->argc > 0)
 584                 pattern = strtok(Req->argv[0], ",");
 585         else
 586                 pattern = "*";
 587
 588         if (Req->argc == 2) {
 589                 /* Forward to other server? */
 590                 target = Client_Search(Req->argv[1]);
 591                 if (! target || Client_Type(target) != CLIENT_SERVER)
 592                         return IRC_WriteErrClient(from, ERR_NOSUCHSERVER_MSG,
 593                                                   Client_ID(Client),
 594                                                   Req->argv[1]);
 595
 596                 if (target != Client_ThisServer()) {
 597                         /* Target is indeed an other server, forward it! */
 598                         return IRC_WriteStrClientPrefix(target, from,
 599                                                         "LIST %s :%s",
 600                                                         Req->argv[0],
 601                                                         Req->argv[1]);
 602                 }
 603         }
 604
 605         /* Send list head */
 606         if (!IRC_WriteStrClient(from, RPL_LISTSTART_MSG, Client_ID(from)))
 607                 return DISCONNECTED;
 608
 609         while (pattern) {
 610                 /* Loop through all the channels */
 611                 if (Req->argc > 0)
 612                         ngt_LowerStr(pattern);
 613                 chan = Channel_First();
 614                 while (chan) {
 615                         /* Check search pattern */
 616                         if (MatchCaseInsensitive(pattern, Channel_Name(chan))) {
 617                                 /* Gotcha! */
 618                                 if (!Channel_HasMode(chan, 's')
 619                                     || Channel_IsMemberOf(chan, from)
 620                                     || Client_HasMode(from, 'o'))
 621                                 {
 622                                         if ((Conf_MaxListSize > 0)
 623                                             && IRC_CheckListTooBig(from, count,
 624                                                                    Conf_MaxListSize,
 625                                                                    "LIST"))
 626                                                 break;
 627                                         if (!IRC_WriteStrClient(from,
 628                                              RPL_LIST_MSG, Client_ID(from),
 629                                              Channel_Name(chan),
 630                                              Channel_MemberCount(chan),
 631                                              Channel_Topic( chan )))
 632                                                 return DISCONNECTED;
 633                                         count++;
 634                                 }
 635                         }
 636                         chan = Channel_Next(chan);
 637                 }
 638
 639                 /* Get next name ... */
 640                 if(Req->argc > 0)
 641                         pattern = strtok(NULL, ",");
 642                 else
 643                         pattern = NULL;
 644         }
 645
 646         return IRC_WriteStrClient(from, RPL_LISTEND_MSG, Client_ID(from));
 647 } /* IRC_LIST */
 648
 649 /**
 650  * Handler for the IRC+ "CHANINFO" command.
 651  *
 652  * @param Client The client from which this command has been received.
 653  * @param Req Request structure with prefix and all parameters.
 654  * @return CONNECTED or DISCONNECTED.
 655  */
 656 GLOBAL bool
 657 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 658 {
 659         char modes_add[COMMAND_LEN], l[16];
 660         CLIENT *from;
 661         CHANNEL *chan;
 662         int arg_topic;
 663
 664         assert( Client != NULL );
 665         assert( Req != NULL );
 666
 667         /* Bad number of parameters? */
 668         if (Req->argc < 2 || Req->argc == 4 || Req->argc > 5)
 669                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 670                                           Client_ID(Client), Req->command);
 671
 672         /* Compatibility kludge */
 673         if (Req->argc == 5)
 674                 arg_topic = 4;
 675         else if(Req->argc == 3)
 676                 arg_topic = 2;
 677         else
 678                 arg_topic = -1;
 679
 680         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 681
 682         /* Search or create channel */
 683         chan = Channel_Search( Req->argv[0] );
 684         if (!chan)
 685                 chan = Channel_Create( Req->argv[0] );
 686         if (!chan)
 687                 return CONNECTED;
 688
 689         if (Req->argv[1][0] == '+') {
 690                 if (!*Channel_Modes(chan)) {
 691                         /* OK, this channel doesn't have modes yet,
 692                          * set the received ones: */
 693                         Channel_SetModes(chan, &Req->argv[1][1]);
 694
 695                         if(Req->argc == 5) {
 696                                 if(Channel_HasMode(chan, 'k'))
 697                                         Channel_SetKey(chan, Req->argv[2]);
 698                                 if(Channel_HasMode(chan, 'l'))
 699                                         Channel_SetMaxUsers(chan, atol(Req->argv[3]));
 700                         } else {
 701                                 /* Delete modes which we never want to inherit */
 702                                 Channel_ModeDel(chan, 'l');
 703                                 Channel_ModeDel(chan, 'k');
 704                         }
 705
 706                         strcpy(modes_add, "");
 707                         if (Channel_HasMode(chan, 'l'))  {
 708                                 snprintf(l, sizeof(l), " %lu",
 709                                          Channel_MaxUsers(chan));
 710                                 strlcat(modes_add, l, sizeof(modes_add));
 711                         }
 712                         if (Channel_HasMode(chan, 'k'))  {
 713                                 strlcat(modes_add, " ", sizeof(modes_add));
 714                                 strlcat(modes_add, Channel_Key(chan),
 715                                         sizeof(modes_add));
 716                         }
 717
 718                         /* Inform members of this channel */
 719                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 720                                                   "MODE %s +%s%s", Req->argv[0],
 721                                                   Channel_Modes(chan), modes_add);
 722                 }
 723         }
 724         else
 725                 Log(LOG_WARNING, "CHANINFO: invalid MODE format ignored!");
 726
 727         if (arg_topic > 0) {
 728                 /* We got a topic */
 729                 if (!*Channel_Topic(chan) && Req->argv[arg_topic][0]) {
 730                         /* OK, there is no topic jet */
 731                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 732                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 733                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 734                 }
 735         }
 736
 737         /* Forward CHANINFO to other servers */
 738         if (Req->argc == 5)
 739                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 740                                               "CHANINFO %s %s %s %s :%s",
 741                                               Req->argv[0], Req->argv[1],
 742                                               Req->argv[2], Req->argv[3],
 743                                               Req->argv[4]);
 744         else if (Req->argc == 3)
 745                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 746                                               "CHANINFO %s %s :%s",
 747                                               Req->argv[0], Req->argv[1],
 748                                               Req->argv[2]);
 749         else
 750                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 751                                               "CHANINFO %s %s",
 752                                               Req->argv[0], Req->argv[1]);
 753
 754         return CONNECTED;
 755 } /* IRC_CHANINFO */
 756
 757 /* -eof- */