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 <assert.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "defines.h"
  25 #include "conn.h"
  26 #include "channel.h"
  27 #include "conn-func.h"
  28 #include "lists.h"
  29 #include "log.h"
  30 #include "match.h"
  31 #include "messages.h"
  32 #include "parse.h"
  33 #include "irc.h"
  34 #include "irc-info.h"
  35 #include "irc-macros.h"
  36 #include "irc-write.h"
  37 #include "conf.h"
  38
  39 #include "irc-channel.h"
  40
  41 /**
  42  * Part from all channels.
  43  *
  44  * RFC 2812, (3.2.1 Join message Command):
  45  *  Note that this message accepts a special argument ("0"), which is a
  46  *  special request to leave all channels the user is currently a member of.
  47  *  The server will process this message as if the user had sent a PART
  48  *  command (See Section 3.2.2) for each channel he is a member of.
  49  *
  50  * @param client        Client that initiated the part request
  51  * @param target        Client that should part all joined channels
  52  * @returns             CONNECTED or DISCONNECTED
  53  */
  54 static bool
  55 part_from_all_channels(CLIENT* client, CLIENT *target)
  56 {
  57         CL2CHAN *cl2chan;
  58         CHANNEL *chan;
  59
  60         while ((cl2chan = Channel_FirstChannelOf(target))) {
  61                 chan = Channel_GetChannel(cl2chan);
  62                 assert( chan != NULL );
  63                 Channel_Part(target, client, Channel_Name(chan), Client_ID(target));
  64         }
  65         return CONNECTED;
  66 } /* part_from_all_channels */
  67
  68 /**
  69  * Check weather a local client is allowed to join an already existing
  70  * channel or not.
  71  *
  72  * @param Client        Client that sent the JOIN command
  73  * @param chan          Channel to check
  74  * @param channame      Name of the channel
  75  * @param key           Provided channel key (or NULL)
  76  * @returns             true if client is allowed to join, false otherwise
  77  */
  78 static bool
  79 join_allowed(CLIENT *Client, CHANNEL *chan, const char *channame,
  80              const char *key)
  81 {
  82         bool is_invited, is_banned, is_exception;
  83
  84         /* Allow IRC operators to overwrite channel limits */
  85         if (Client_HasMode(Client, 'o'))
  86                 return true;
  87
  88         is_banned = Lists_Check(Channel_GetListBans(chan), Client);
  89         is_exception = Lists_Check(Channel_GetListExcepts(chan), Client);
  90         is_invited = Lists_Check(Channel_GetListInvites(chan), Client);
  91
  92         if (is_banned && !is_invited && !is_exception) {
  93                 /* Client is banned from channel (and not on invite list) */
  94                 IRC_WriteErrClient(Client, ERR_BANNEDFROMCHAN_MSG,
  95                                    Client_ID(Client), channame);
  96                 return false;
  97         }
  98
  99         if (Channel_HasMode(chan, 'i') && !is_invited) {
 100                 /* Channel is "invite-only" and client is not on invite list */
 101                 IRC_WriteErrClient(Client, ERR_INVITEONLYCHAN_MSG,
 102                                    Client_ID(Client), channame);
 103                 return false;
 104         }
 105
 106         if (!Channel_CheckKey(chan, Client, key ? key : "")) {
 107                 /* Channel is protected by a channel key and the client
 108                  * didn't specify the correct one */
 109                 IRC_WriteErrClient(Client, ERR_BADCHANNELKEY_MSG,
 110                                    Client_ID(Client), channame);
 111                 return false;
 112         }
 113
 114         if (Channel_HasMode(chan, 'l') &&
 115             (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
 116                 /* There are more clints joined to this channel than allowed */
 117                 IRC_WriteErrClient(Client, ERR_CHANNELISFULL_MSG,
 118                                    Client_ID(Client), channame);
 119                 return false;
 120         }
 121
 122         if (Channel_HasMode(chan, 'z') && !Conn_UsesSSL(Client_Conn(Client))) {
 123                 /* Only "secure" clients are allowed, but clients doesn't
 124                  * use SSL encryption */
 125                 IRC_WriteErrClient(Client, ERR_SECURECHANNEL_MSG,
 126                                    Client_ID(Client), channame);
 127                 return false;
 128         }
 129
 130         if (Channel_HasMode(chan, 'O') && !Client_HasMode(Client, 'o')) {
 131                 /* Only IRC operators are allowed! */
 132                 IRC_WriteErrClient(Client, ERR_OPONLYCHANNEL_MSG,
 133                                    Client_ID(Client), channame);
 134                 return false;
 135         }
 136
 137         if (Channel_HasMode(chan, 'R') && !Client_HasMode(Client, 'R')) {
 138                 /* Only registered users are allowed! */
 139                 IRC_WriteErrClient(Client, ERR_REGONLYCHANNEL_MSG,
 140                                    Client_ID(Client), channame);
 141                 return false;
 142         }
 143
 144         return true;
 145 } /* join_allowed */
 146
 147 /**
 148  * Set user channel modes.
 149  *
 150  * @param chan          Channel
 151  * @param target        User to set modes for
 152  * @param flags         Channel modes to add
 153  */
 154 static void
 155 join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
 156 {
 157         if (flags) {
 158                 while (*flags) {
 159                         Channel_UserModeAdd(chan, target, *flags);
 160                         flags++;
 161                 }
 162         }
 163
 164         /* If the channel is persistent (+P) and client is an IRC op:
 165          * make client chanop, if not disabled in configuration. */
 166         if (Channel_HasMode(chan, 'P') && Conf_OperChanPAutoOp
 167             && Client_HasMode(target, 'o'))
 168                 Channel_UserModeAdd(chan, target, 'o');
 169 } /* join_set_channelmodes */
 170
 171 /**
 172  * Forward JOIN command to a specific server
 173  *
 174  * This function differentiates between servers using RFC 2813 mode that
 175  * support the JOIN command with appended ASCII 7 character and channel
 176  * modes, and servers using RFC 1459 protocol which require separate JOIN
 177  * and MODE commands.
 178  *
 179  * @param To            Forward JOIN (and MODE) command to this peer server
 180  * @param Prefix        Client used to prefix the genrated commands
 181  * @param Data          Parameters of JOIN command to forward, probably
 182  *                      containing channel modes separated by ASCII 7.
 183  */
 184 static void
 185 cb_join_forward(CLIENT *To, CLIENT *Prefix, void *Data)
 186 {
 187         CONN_ID conn;
 188         char str[COMMAND_LEN], *ptr = NULL;
 189
 190         strlcpy(str, (char *)Data, sizeof(str));
 191         conn = Client_Conn(To);
 192
 193         if (Conn_Options(conn) & CONN_RFC1459) {
 194                 /* RFC 1459 compatibility mode, appended modes are NOT
 195                  * supported, so strip them off! */
 196                 ptr = strchr(str, 0x7);
 197                 if (ptr)
 198                         *ptr++ = '\0';
 199         }
 200
 201         IRC_WriteStrClientPrefix(To, Prefix, "JOIN %s", str);
 202         if (ptr && *ptr)
 203                 IRC_WriteStrClientPrefix(To, Prefix, "MODE %s +%s %s", str, ptr,
 204                                          Client_ID(Prefix));
 205 } /* cb_join_forward */
 206
 207 /**
 208  * Forward JOIN command to all servers
 209  *
 210  * This function calls cb_join_forward(), which differentiates between
 211  * protocol implementations (e.g. RFC 2812, RFC 1459).
 212  *
 213  * @param Client        Client used to prefix the genrated commands
 214  * @param target        Forward JOIN (and MODE) command to this peer server
 215  * @param chan          Channel structure
 216  * @param channame      Channel name
 217  */
 218 static void
 219 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 220                                         const char *channame)
 221 {
 222         char modes[CHANNEL_MODE_LEN], str[COMMAND_LEN];
 223
 224         /* RFC 2813, 4.2.1: channel modes are separated from the channel
 225          * name with ASCII 7, if any, and not spaces: */
 226         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 227         if (modes[1])
 228                 modes[0] = 0x7;
 229         else
 230                 modes[0] = '\0';
 231
 232         /* forward to other servers (if it is not a local channel) */
 233         if (!Channel_IsLocal(chan)) {
 234                 snprintf(str, sizeof(str), "%s%s", channame, modes);
 235                 IRC_WriteStrServersPrefixFlag_CB(Client, target, '\0',
 236                                                  cb_join_forward, str);
 237         }
 238
 239         /* tell users in this channel about the new client */
 240         IRC_WriteStrChannelPrefix(Client, chan, target, false,
 241                                   "JOIN :%s",  channame);
 242
 243         /* synchronize channel modes */
 244         if (modes[1]) {
 245                 IRC_WriteStrChannelPrefix(Client, chan, target, false,
 246                                           "MODE %s +%s %s", channame,
 247                                           &modes[1], Client_ID(target));
 248         }
 249 } /* join_forward */
 250
 251 /**
 252  * Acknowledge user JOIN request and send "channel info" numerics.
 253  *
 254  * @param Client        Client used to prefix the genrated commands
 255  * @param target        Forward commands/numerics to this user
 256  * @param chan          Channel structure
 257  * @param channame      Channel name
 258  */
 259 static bool
 260 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 261                                         const char *channame)
 262 {
 263         const char *topic;
 264
 265         if (Client_Type(Client) != CLIENT_USER)
 266                 return true;
 267         /* acknowledge join */
 268         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 269                 return false;
 270
 271         /* Send topic to client, if any */
 272         topic = Channel_Topic(chan);
 273         assert(topic != NULL);
 274         if (*topic) {
 275                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 276                         Client_ID(Client), channame, topic))
 277                                 return false;
 278 #ifndef STRICT_RFC
 279                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 280                         Client_ID(Client), channame,
 281                         Channel_TopicWho(chan),
 282                         Channel_TopicTime(chan)))
 283                                 return false;
 284 #endif
 285         }
 286         /* send list of channel members to client */
 287         if (!IRC_Send_NAMES(Client, chan))
 288                 return false;
 289         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client),
 290                                   Channel_Name(chan));
 291 } /* join_send_topic */
 292
 293 /**
 294  * Handler for the IRC "JOIN" command.
 295  *
 296  * @param Client The client from which this command has been received.
 297  * @param Req Request structure with prefix and all parameters.
 298  * @return CONNECTED or DISCONNECTED.
 299  */
 300 GLOBAL bool
 301 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 302 {
 303         char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 304         CLIENT *target;
 305         CHANNEL *chan;
 306
 307         assert (Client != NULL);
 308         assert (Req != NULL);
 309
 310         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 311
 312         /* Is argument "0"? */
 313         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 314                 return part_from_all_channels(Client, target);
 315
 316         /* Are channel keys given? */
 317         if (Req->argc > 1)
 318                 key = strtok_r(Req->argv[1], ",", &lastkey);
 319
 320         channame = Req->argv[0];
 321         channame = strtok_r(channame, ",", &lastchan);
 322
 323         /* Make sure that "channame" is not the empty string ("JOIN :") */
 324         if (!channame)
 325                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 326                                           Client_ID(Client), Req->command);
 327
 328         while (channame) {
 329                 flags = NULL;
 330
 331                 /* Did the server include channel-user-modes? */
 332                 if (Client_Type(Client) == CLIENT_SERVER) {
 333                         flags = strchr(channame, 0x7);
 334                         if (flags) {
 335                                 *flags = '\0';
 336                                 flags++;
 337                         }
 338                 }
 339
 340                 chan = Channel_Search(channame);
 341
 342                 /* Local client? */
 343                 if (Client_Type(Client) == CLIENT_USER) {
 344                         if (chan) {
 345                                 /* Already existing channel: already member? */
 346                                 if (Channel_IsMemberOf(chan, Client))
 347                                     goto join_next;
 348                         } else {
 349                                 /* Channel must be created */
 350                                 if (!strchr(Conf_AllowedChannelTypes, channame[0])) {
 351                                         /* ... but channel type is not allowed! */
 352                                         IRC_WriteErrClient(Client,
 353                                                 ERR_NOSUCHCHANNEL_MSG,
 354                                                 Client_ID(Client), channame);
 355                                         goto join_next;
 356                                 }
 357                         }
 358
 359                         /* Test if the user has reached the channel limit */
 360                         if ((Conf_MaxJoins > 0) &&
 361                             (Channel_CountForUser(Client) >= Conf_MaxJoins)) {
 362                                 if (!IRC_WriteErrClient(Client,
 363                                                 ERR_TOOMANYCHANNELS_MSG,
 364                                                 Client_ID(Client), channame))
 365                                         return DISCONNECTED;
 366                                 goto join_next;
 367                         }
 368
 369                         if (chan) {
 370                                 /* Already existing channel: check if the
 371                                  * client is allowed to join */
 372                                 if (!join_allowed(Client, chan, channame, key))
 373                                         goto join_next;
 374                         } else {
 375                                 /* New channel: first user will become channel
 376                                  * operator unless this is a modeless channel */
 377                                 if (*channame != '+')
 378                                         flags = "o";
 379                         }
 380
 381                         /* Local client: update idle time */
 382                         Conn_UpdateIdle(Client_Conn(Client));
 383                 } else {
 384                         /* Remote server: we don't need to know whether the
 385                          * client is invited or not, but we have to make sure
 386                          * that the "one shot" entries (generated by INVITE
 387                          * commands) in this list become deleted when a user
 388                          * joins a channel this way. */
 389                         if (chan)
 390                                 (void)Lists_Check(Channel_GetListInvites(chan),
 391                                                   target);
 392                 }
 393
 394                 /* Join channel (and create channel if it doesn't exist) */
 395                 if (!Channel_Join(target, channame))
 396                         goto join_next;
 397
 398                 if (!chan) { /* channel is new; it has been created above */
 399                         chan = Channel_Search(channame);
 400                         assert(chan != NULL);
 401                         if (Channel_IsModeless(chan)) {
 402                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 403                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 404                         }
 405                 }
 406                 assert(chan != NULL);
 407
 408                 join_set_channelmodes(chan, target, flags);
 409
 410                 join_forward(Client, target, chan, channame);
 411
 412                 if (!join_send_topic(Client, target, chan, channame))
 413                         break; /* write error */
 414
 415         join_next:
 416                 /* next channel? */
 417                 channame = strtok_r(NULL, ",", &lastchan);
 418                 if (channame && key)
 419                         key = strtok_r(NULL, ",", &lastkey);
 420         }
 421         return CONNECTED;
 422 } /* IRC_JOIN */
 423
 424 /**
 425  * Handler for the IRC "PART" command.
 426  *
 427  * @param Client The client from which this command has been received.
 428  * @param Req Request structure with prefix and all parameters.
 429  * @return CONNECTED or DISCONNECTED.
 430  */
 431 GLOBAL bool
 432 IRC_PART(CLIENT * Client, REQUEST * Req)
 433 {
 434         CLIENT *target;
 435         char *chan;
 436
 437         assert(Client != NULL);
 438         assert(Req != NULL);
 439
 440         _IRC_GET_SENDER_OR_RETURN_(target, Req, Client)
 441
 442         /* Loop over all the given channel names */
 443         chan = strtok(Req->argv[0], ",");
 444
 445         /* Make sure that "chan" is not the empty string ("PART :") */
 446         if (!chan)
 447                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 448                                           Client_ID(Client), Req->command);
 449
 450         while (chan) {
 451                 Channel_Part(target, Client, chan,
 452                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 453                 chan = strtok(NULL, ",");
 454         }
 455
 456         /* Update idle time, if local client */
 457         if (Client_Conn(Client) > NONE)
 458                 Conn_UpdateIdle(Client_Conn(Client));
 459
 460         return CONNECTED;
 461 } /* IRC_PART */
 462
 463 /**
 464  * Handler for the IRC "TOPIC" command.
 465  *
 466  * @param Client The client from which this command has been received.
 467  * @param Req Request structure with prefix and all parameters.
 468  * @return CONNECTED or DISCONNECTED.
 469  */
 470 GLOBAL bool
 471 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 472 {
 473         CHANNEL *chan;
 474         CLIENT *from;
 475         char *topic;
 476         bool r, topic_power;
 477
 478         assert( Client != NULL );
 479         assert( Req != NULL );
 480
 481         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 482
 483         chan = Channel_Search(Req->argv[0]);
 484         if (!chan)
 485                 return IRC_WriteErrClient(from, ERR_NOSUCHCHANNEL_MSG,
 486                                           Client_ID(from), Req->argv[0]);
 487
 488         /* Only remote servers and channel members are allowed to change the
 489          * channel topic, and IRC operators when the Conf_OperCanMode option
 490          * is set in the server configuration. */
 491         if (Client_Type(Client) != CLIENT_SERVER) {
 492                 topic_power = Client_HasMode(from, 'o');
 493                 if (!Channel_IsMemberOf(chan, from)
 494                     && !(Conf_OperCanMode && topic_power))
 495                         return IRC_WriteErrClient(from, ERR_NOTONCHANNEL_MSG,
 496                                                   Client_ID(from), Req->argv[0]);
 497         } else
 498                 topic_power = true;
 499
 500         if (Req->argc == 1) {
 501                 /* Request actual topic */
 502                 topic = Channel_Topic(chan);
 503                 if (*topic) {
 504                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 505                                                Client_ID(Client),
 506                                                Channel_Name(chan), topic);
 507 #ifndef STRICT_RFC
 508                         if (!r)
 509                                 return r;
 510                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 511                                                Client_ID(Client),
 512                                                Channel_Name(chan),
 513                                                Channel_TopicWho(chan),
 514                                                Channel_TopicTime(chan));
 515 #endif
 516                         return r;
 517                 }
 518                 else
 519                         return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 520                                                   Client_ID(from),
 521                                                   Channel_Name(chan));
 522         }
 523
 524         if (Channel_HasMode(chan, 't')) {
 525                 /* Topic Lock. Is the user a channel op or IRC operator? */
 526                 if(!topic_power &&
 527                    !Channel_UserHasMode(chan, from, 'h') &&
 528                    !Channel_UserHasMode(chan, from, 'o') &&
 529                    !Channel_UserHasMode(chan, from, 'a') &&
 530                    !Channel_UserHasMode(chan, from, 'q'))
 531                         return IRC_WriteErrClient(from, ERR_CHANOPRIVSNEEDED_MSG,
 532                                                   Client_ID(from),
 533                                                   Channel_Name(chan));
 534         }
 535
 536         /* Set new topic */
 537         Channel_SetTopic(chan, from, Req->argv[1]);
 538         LogDebug("%s \"%s\" set topic on \"%s\": %s",
 539                  Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
 540                  Req->argv[1][0] ? Req->argv[1] : "<none>");
 541
 542         if (Conf_OperServerMode)
 543                 from = Client_ThisServer();
 544
 545         /* Update channel and forward new topic to other servers */
 546         if (!Channel_IsLocal(chan))
 547                 IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
 548                                           Req->argv[0], Req->argv[1]);
 549         IRC_WriteStrChannelPrefix(Client, chan, from, false, "TOPIC %s :%s",
 550                                   Req->argv[0], Req->argv[1]);
 551
 552         if (Client_Type(Client) == CLIENT_USER)
 553                 return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
 554                                                 Req->argv[0], Req->argv[1]);
 555         else
 556                 return CONNECTED;
 557 } /* IRC_TOPIC */
 558
 559 /**
 560  * Handler for the IRC "LIST" command.
 561  *
 562  * @param Client The client from which this command has been received.
 563  * @param Req Request structure with prefix and all parameters.
 564  * @return CONNECTED or DISCONNECTED.
 565  */
 566 GLOBAL bool
 567 IRC_LIST( CLIENT *Client, REQUEST *Req )
 568 {
 569         char *pattern;
 570         CHANNEL *chan;
 571         CLIENT *from, *target;
 572         int count = 0;
 573
 574         assert(Client != NULL);
 575         assert(Req != NULL);
 576
 577         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 578
 579         if (Req->argc > 0)
 580                 pattern = strtok(Req->argv[0], ",");
 581         else
 582                 pattern = "*";
 583
 584         if (Req->argc == 2) {
 585                 /* Forward to other server? */
 586                 target = Client_Search(Req->argv[1]);
 587                 if (! target || Client_Type(target) != CLIENT_SERVER)
 588                         return IRC_WriteErrClient(from, ERR_NOSUCHSERVER_MSG,
 589                                                   Client_ID(Client),
 590                                                   Req->argv[1]);
 591
 592                 if (target != Client_ThisServer()) {
 593                         /* Target is indeed an other server, forward it! */
 594                         return IRC_WriteStrClientPrefix(target, from,
 595                                                         "LIST %s :%s",
 596                                                         Req->argv[0],
 597                                                         Req->argv[1]);
 598                 }
 599         }
 600
 601         while (pattern) {
 602                 /* Loop through all the channels */
 603                 if (Req->argc > 0)
 604                         ngt_LowerStr(pattern);
 605                 chan = Channel_First();
 606                 while (chan) {
 607                         /* Check search pattern */
 608                         if (MatchCaseInsensitive(pattern, Channel_Name(chan))) {
 609                                 /* Gotcha! */
 610                                 if (!Channel_HasMode(chan, 's')
 611                                     || Channel_IsMemberOf(chan, from)
 612                                     || (!Conf_MorePrivacy
 613                                         && Client_HasMode(Client, 'o')
 614                                         && Client_Conn(Client) > NONE))
 615                                 {
 616                                         if ((Conf_MaxListSize > 0)
 617                                             && IRC_CheckListTooBig(from, count,
 618                                                                    Conf_MaxListSize,
 619                                                                    "LIST"))
 620                                                 break;
 621                                         if (!IRC_WriteStrClient(from,
 622                                              RPL_LIST_MSG, Client_ID(from),
 623                                              Channel_Name(chan),
 624                                              Channel_MemberCount(chan),
 625                                              Channel_Topic( chan )))
 626                                                 return DISCONNECTED;
 627                                         count++;
 628                                 }
 629                         }
 630                         chan = Channel_Next(chan);
 631                 }
 632
 633                 /* Get next name ... */
 634                 if(Req->argc > 0)
 635                         pattern = strtok(NULL, ",");
 636                 else
 637                         pattern = NULL;
 638         }
 639
 640         return IRC_WriteStrClient(from, RPL_LISTEND_MSG, Client_ID(from));
 641 } /* IRC_LIST */
 642
 643 /**
 644  * Handler for the IRC+ "CHANINFO" command.
 645  *
 646  * @param Client The client from which this command has been received.
 647  * @param Req Request structure with prefix and all parameters.
 648  * @return CONNECTED or DISCONNECTED.
 649  */
 650 GLOBAL bool
 651 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 652 {
 653         char modes_add[COMMAND_LEN], l[16];
 654         CLIENT *from;
 655         CHANNEL *chan;
 656         int arg_topic;
 657
 658         assert( Client != NULL );
 659         assert( Req != NULL );
 660
 661         /* Bad number of parameters? */
 662         if (Req->argc < 2 || Req->argc == 4 || Req->argc > 5)
 663                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 664                                           Client_ID(Client), Req->command);
 665
 666         /* Compatibility kludge */
 667         if (Req->argc == 5)
 668                 arg_topic = 4;
 669         else if(Req->argc == 3)
 670                 arg_topic = 2;
 671         else
 672                 arg_topic = -1;
 673
 674         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 675
 676         /* Search or create channel */
 677         chan = Channel_Search( Req->argv[0] );
 678         if (!chan)
 679                 chan = Channel_Create( Req->argv[0] );
 680         if (!chan)
 681                 return CONNECTED;
 682
 683         if (Req->argv[1][0] == '+') {
 684                 if (!*Channel_Modes(chan)) {
 685                         /* OK, this channel doesn't have modes yet,
 686                          * set the received ones: */
 687                         Channel_SetModes(chan, &Req->argv[1][1]);
 688
 689                         if(Req->argc == 5) {
 690                                 if(Channel_HasMode(chan, 'k'))
 691                                         Channel_SetKey(chan, Req->argv[2]);
 692                                 if(Channel_HasMode(chan, 'l'))
 693                                         Channel_SetMaxUsers(chan, atol(Req->argv[3]));
 694                         } else {
 695                                 /* Delete modes which we never want to inherit */
 696                                 Channel_ModeDel(chan, 'l');
 697                                 Channel_ModeDel(chan, 'k');
 698                         }
 699
 700                         strcpy(modes_add, "");
 701                         if (Channel_HasMode(chan, 'l'))  {
 702                                 snprintf(l, sizeof(l), " %lu",
 703                                          Channel_MaxUsers(chan));
 704                                 strlcat(modes_add, l, sizeof(modes_add));
 705                         }
 706                         if (Channel_HasMode(chan, 'k'))  {
 707                                 strlcat(modes_add, " ", sizeof(modes_add));
 708                                 strlcat(modes_add, Channel_Key(chan),
 709                                         sizeof(modes_add));
 710                         }
 711
 712                         /* Inform members of this channel */
 713                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 714                                                   "MODE %s +%s%s", Req->argv[0],
 715                                                   Channel_Modes(chan), modes_add);
 716                 }
 717         }
 718         else
 719                 Log(LOG_WARNING, "CHANINFO: invalid MODE format ignored!");
 720
 721         if (arg_topic > 0) {
 722                 /* We got a topic */
 723                 if (!*Channel_Topic(chan) && Req->argv[arg_topic][0]) {
 724                         /* OK, there is no topic jet */
 725                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 726                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 727                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 728                 }
 729         }
 730
 731         /* Forward CHANINFO to other servers */
 732         if (Req->argc == 5)
 733                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 734                                               "CHANINFO %s %s %s %s :%s",
 735                                               Req->argv[0], Req->argv[1],
 736                                               Req->argv[2], Req->argv[3],
 737                                               Req->argv[4]);
 738         else if (Req->argc == 3)
 739                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 740                                               "CHANINFO %s %s :%s",
 741                                               Req->argv[0], Req->argv[1],
 742                                               Req->argv[2]);
 743         else
 744                 IRC_WriteStrServersPrefixFlag(Client, from, 'C',
 745                                               "CHANINFO %s %s",
 746                                               Req->argv[0], Req->argv[1]);
 747
 748         return CONNECTED;
 749 } /* IRC_CHANINFO */
 750
 751 /* -eof- */