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