src/ngircd/irc-channel.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC channel commands
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "defines.h"
  26 #include "conn.h"
  27 #include "channel.h"
  28 #include "conn-func.h"
  29 #include "lists.h"
  30 #include "log.h"
  31 #include "match.h"
  32 #include "messages.h"
  33 #include "parse.h"
  34 #include "irc.h"
  35 #include "irc-info.h"
  36 #include "irc-write.h"
  37 #include "conf.h"
  38
  39 #include "exp.h"
  40 #include "irc-channel.h"
  41
  42
  43 /**
  44  * Part from all channels.
  45  *
  46  * RFC 2812, (3.2.1 Join message Command):
  47  *  Note that this message accepts a special argument ("0"), which is a
  48  *  special request to leave all channels the user is currently a member of.
  49  *  The server will process this message as if the user had sent a PART
  50  *  command (See Section 3.2.2) for each channel he is a member of.
  51  *
  52  * @param client        Client that initiated the part request
  53  * @param target        Client that should part all joined channels
  54  * @returns             CONNECTED or DISCONNECTED
  55  */
  56 static bool
  57 part_from_all_channels(CLIENT* client, CLIENT *target)
  58 {
  59         CL2CHAN *cl2chan;
  60         CHANNEL *chan;
  61
  62         while ((cl2chan = Channel_FirstChannelOf(target))) {
  63                 chan = Channel_GetChannel(cl2chan);
  64                 assert( chan != NULL );
  65                 Channel_Part(target, client, Channel_Name(chan), Client_ID(target));
  66         }
  67         return CONNECTED;
  68 } /* part_from_all_channels */
  69
  70
  71 /**
  72  * Check weather a local client is allowed to join an already existing
  73  * channel or not.
  74  *
  75  * @param Client        Client that sent the JOIN command
  76  * @param chan          Channel to check
  77  * @param channame      Name of the channel
  78  * @param key           Provided channel key (or NULL)
  79  * @returns             true if client is allowed to join, false otherwise
  80  */
  81 static bool
  82 join_allowed(CLIENT *Client, CHANNEL *chan, const char *channame,
  83              const char *key)
  84 {
  85         bool is_invited, is_banned;
  86         const char *channel_modes;
  87
  88         /* Allow IRC operators to overwrite channel limits */
  89         if (strchr(Client_Modes(Client), 'o'))
  90                 return true;
  91
  92         is_banned = Lists_Check(Channel_GetListBans(chan), Client);
  93         is_invited = Lists_Check(Channel_GetListInvites(chan), Client);
  94
  95         if (is_banned && !is_invited) {
  96                 /* Client is banned from channel (and not on invite list) */
  97                 IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG,
  98                                    Client_ID(Client), channame);
  99                 return false;
 100         }
 101
 102         channel_modes = Channel_Modes(chan);
 103         if (strchr(channel_modes, 'i') && !is_invited) {
 104                 /* Channel is "invite-only" and client is not on invite list */
 105                 IRC_WriteStrClient(Client, ERR_INVITEONLYCHAN_MSG,
 106                                    Client_ID(Client), channame);
 107                 return false;
 108         }
 109
 110         if (!Channel_CheckKey(chan, Client, key ? key : "")) {
 111                 /* Channel is protected by a channel key and the client
 112                  * didn't specify the correct one */
 113                 IRC_WriteStrClient(Client, ERR_BADCHANNELKEY_MSG,
 114                                    Client_ID(Client), channame);
 115                 return false;
 116         }
 117
 118         if (strchr(channel_modes, 'l') &&
 119             (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
 120                 /* There are more clints joined to this channel than allowed */
 121                 IRC_WriteStrClient(Client, ERR_CHANNELISFULL_MSG,
 122                                    Client_ID(Client), channame);
 123                 return false;
 124         }
 125
 126         if (strchr(channel_modes, 'z') && !Conn_UsesSSL(Client_Conn(Client))) {
 127                 /* Only "secure" clients are allowed, but clients doesn't
 128                  * use SSL encryption */
 129                 IRC_WriteStrClient(Client, ERR_SECURECHANNEL_MSG,
 130                                    Client_ID(Client), channame);
 131                 return false;
 132         }
 133
 134         if (strchr(channel_modes, 'O') && !Client_OperByMe(Client)) {
 135                 /* Only IRC operators are allowed! */
 136                 IRC_WriteStrClient(Client, ERR_OPONLYCHANNEL_MSG,
 137                                    Client_ID(Client), channame);
 138                 return false;
 139         }
 140
 141         if (strchr(channel_modes, 'R') && !strchr(Client_Modes(Client), 'R')) {
 142                 /* Only registered users are allowed! */
 143                 IRC_WriteStrClient(Client, ERR_REGONLYCHANNEL_MSG,
 144                                    Client_ID(Client), channame);
 145                 return false;
 146         }
 147
 148         return true;
 149 } /* join_allowed */
 150
 151
 152 /**
 153  * Set user channel modes.
 154  *
 155  * @param chan          Channel
 156  * @param target        User to set modes for
 157  * @param flags         Channel modes to add
 158  */
 159 static void
 160 join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
 161 {
 162         if (flags) {
 163                 while (*flags) {
 164                         Channel_UserModeAdd(chan, target, *flags);
 165                         flags++;
 166                 }
 167         }
 168
 169         /* If channel persistent and client is ircop: make client chanop */
 170         if (strchr(Channel_Modes(chan), 'P') && strchr(Client_Modes(target), 'o'))
 171                 Channel_UserModeAdd(chan, target, 'o');
 172 } /* join_set_channelmodes */
 173
 174
 175 /**
 176  * Forward JOIN command to a specific server
 177  *
 178  * This function diffentiates between servers using RFC 2813 mode that
 179  * support the JOIN command with appended ASCII 7 character and channel
 180  * modes, and servers using RFC 1459 protocol which require separate JOIN
 181  * and MODE commands.
 182  *
 183  * @param To            Forward JOIN (and MODE) command to this peer server
 184  * @param Prefix        Client used to prefix the genrated commands
 185  * @param Data          Parameters of JOIN command to forward, probably
 186  *                      containing channel modes separated by ASCII 7.
 187  */
 188 static void
 189 cb_join_forward(CLIENT *To, CLIENT *Prefix, void *Data)
 190 {
 191         CONN_ID conn;
 192         char str[COMMAND_LEN], *ptr = NULL;
 193
 194         strlcpy(str, (char *)Data, sizeof(str));
 195         conn = Client_Conn(To);
 196
 197         if (Conn_Options(conn) & CONN_RFC1459) {
 198                 /* RFC 1459 compatibility mode, appended modes are NOT
 199                  * supported, so strip them off! */
 200                 ptr = strchr(str, 0x7);
 201                 if (ptr)
 202                         *ptr++ = '\0';
 203         }
 204
 205         IRC_WriteStrClientPrefix(To, Prefix, "JOIN %s", str);
 206         if (ptr && *ptr)
 207                 IRC_WriteStrClientPrefix(To, Prefix, "MODE %s +%s %s", str, ptr,
 208                                          Client_ID(Prefix));
 209 } /* cb_join_forward */
 210
 211
 212 /**
 213  * Forward JOIN command to all servers
 214  *
 215  * This function calls cb_join_forward(), which differentiates between
 216  * protocol implementations (e.g. RFC 2812, RFC 1459).
 217  *
 218  * @param Client        Client used to prefix the genrated commands
 219  * @param target        Forward JOIN (and MODE) command to this peer server
 220  * @param chan          Channel structure
 221  * @param channame      Channel name
 222  */
 223 static void
 224 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 225                                         const char *channame)
 226 {
 227         char modes[CHANNEL_MODE_LEN], str[COMMAND_LEN];
 228
 229         /* RFC 2813, 4.2.1: channel modes are separated from the channel
 230          * name with ASCII 7, if any, and not spaces: */
 231         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 232         if (modes[1])
 233                 modes[0] = 0x7;
 234         else
 235                 modes[0] = '\0';
 236
 237         /* forward to other servers (if it is not a local channel) */
 238         if (!Channel_IsLocal(chan)) {
 239                 snprintf(str, sizeof(str), "%s%s", channame, modes);
 240                 IRC_WriteStrServersPrefixFlag_CB(Client, target, '\0',
 241                                                  cb_join_forward, str);
 242         }
 243
 244         /* tell users in this channel about the new client */
 245         IRC_WriteStrChannelPrefix(Client, chan, target, false,
 246                                   "JOIN :%s",  channame);
 247
 248         /* synchronize channel modes */
 249         if (modes[1]) {
 250                 IRC_WriteStrChannelPrefix(Client, chan, target, false,
 251                                           "MODE %s +%s %s", channame,
 252                                           &modes[1], Client_ID(target));
 253         }
 254 } /* join_forward */
 255
 256
 257 /**
 258  * Aknowledge user JOIN request and send "channel info" numerics.
 259  *
 260  * @param Client        Client used to prefix the genrated commands
 261  * @param target        Forward commands/numerics to this user
 262  * @param chan          Channel structure
 263  * @param channame      Channel name
 264  */
 265 static bool
 266 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 267                                         const char *channame)
 268 {
 269         const char *topic;
 270
 271         if (Client_Type(Client) != CLIENT_USER)
 272                 return true;
 273         /* acknowledge join */
 274         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 275                 return false;
 276
 277         /* Send topic to client, if any */
 278         topic = Channel_Topic(chan);
 279         assert(topic != NULL);
 280         if (*topic) {
 281                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 282                         Client_ID(Client), channame, topic))
 283                                 return false;
 284 #ifndef STRICT_RFC
 285                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 286                         Client_ID(Client), channame,
 287                         Channel_TopicWho(chan),
 288                         Channel_TopicTime(chan)))
 289                                 return false;
 290 #endif
 291         }
 292         /* send list of channel members to client */
 293         if (!IRC_Send_NAMES(Client, chan))
 294                 return false;
 295         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client),
 296                                   Channel_Name(chan));
 297 } /* join_send_topic */
 298
 299
 300 /**
 301  * Handler for the IRC "JOIN" command.
 302  *
 303  * See RFC 2812, 3.2.1 "Join message"; RFC 2813, 4.2.1 "Join message".
 304  *
 305  * @param Client The client from which this command has been received
 306  * @param Req Request structure with prefix and all parameters
 307  * @returns CONNECTED or DISCONNECTED
 308  */
 309 GLOBAL bool
 310 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 311 {
 312         char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 313         CLIENT *target;
 314         CHANNEL *chan;
 315
 316         assert (Client != NULL);
 317         assert (Req != NULL);
 318
 319         /* Bad number of arguments? */
 320         if (Req->argc < 1 || Req->argc > 2)
 321                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 322                                           Client_ID(Client), Req->command);
 323
 324         /* Who is the sender? */
 325         if (Client_Type(Client) == CLIENT_SERVER)
 326                 target = Client_Search(Req->prefix);
 327         else
 328                 target = Client;
 329
 330         if (!target)
 331                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 332                                           Client_ID(Client), Req->prefix);
 333
 334         /* Is argument "0"? */
 335         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 336                 return part_from_all_channels(Client, target);
 337
 338         /* Are channel keys given? */
 339         if (Req->argc > 1)
 340                 key = strtok_r(Req->argv[1], ",", &lastkey);
 341
 342         channame = Req->argv[0];
 343         channame = strtok_r(channame, ",", &lastchan);
 344
 345         /* Make sure that "channame" is not the empty string ("JOIN :") */
 346         if (! channame)
 347                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 348                                           Client_ID(Client), Req->command);
 349
 350         while (channame) {
 351                 flags = NULL;
 352
 353                 /* Did the server include channel-user-modes? */
 354                 if (Client_Type(Client) == CLIENT_SERVER) {
 355                         flags = strchr(channame, 0x7);
 356                         if (flags) {
 357                                 *flags = '\0';
 358                                 flags++;
 359                         }
 360                 }
 361
 362                 chan = Channel_Search(channame);
 363                 if (!chan && Conf_PredefChannelsOnly) {
 364                          /* channel must be created, but forbidden by config */
 365                         IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG,
 366                                            Client_ID(Client), channame);
 367                         goto join_next;
 368                 }
 369
 370                 /* Local client? */
 371                 if (Client_Type(Client) == CLIENT_USER) {
 372                         if (chan) {
 373                                 /* Already existing channel: already member? */
 374                                 if (Channel_IsMemberOf(chan, Client))
 375                                     goto join_next;
 376                         }
 377
 378                         /* Test if the user has reached the channel limit */
 379                         if ((Conf_MaxJoins > 0) &&
 380                             (Channel_CountForUser(Client) >= Conf_MaxJoins)) {
 381                                 if (!IRC_WriteStrClient(Client,
 382                                                 ERR_TOOMANYCHANNELS_MSG,
 383                                                 Client_ID(Client), channame))
 384                                         return DISCONNECTED;
 385                                 goto join_next;
 386                         }
 387
 388                         if (chan) {
 389                                 /* Already existing channel: check if the
 390                                  * client is allowed to join */
 391                                 if (!join_allowed(Client, chan, channame, key))
 392                                         goto join_next;
 393                         } else {
 394                                 /* New channel: first user will become channel
 395                                  * operator unless this is a modeless channel */
 396                                 if (*channame != '+')
 397                                         flags = "o";
 398                         }
 399
 400                         /* Local client: update idle time */
 401                         Conn_UpdateIdle(Client_Conn(Client));
 402                 } else {
 403                         /* Remote server: we don't need to know whether the
 404                          * client is invited or not, but we have to make sure
 405                          * that the "one shot" entries (generated by INVITE
 406                          * commands) in this list become deleted when a user
 407                          * joins a channel this way. */
 408                         if (chan)
 409                                 (void)Lists_Check(Channel_GetListInvites(chan),
 410                                                   target);
 411                 }
 412
 413                 /* Join channel (and create channel if it doesn't exist) */
 414                 if (!Channel_Join(target, channame))
 415                         goto join_next;
 416
 417                 if (!chan) { /* channel is new; it has been created above */
 418                         chan = Channel_Search(channame);
 419                         assert(chan != NULL);
 420                         if (Channel_IsModeless(chan)) {
 421                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 422                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 423                         }
 424                 }
 425                 assert(chan != NULL);
 426
 427                 join_set_channelmodes(chan, target, flags);
 428
 429                 join_forward(Client, target, chan, channame);
 430
 431                 if (!join_send_topic(Client, target, chan, channame))
 432                         break; /* write error */
 433
 434         join_next:
 435                 /* next channel? */
 436                 channame = strtok_r(NULL, ",", &lastchan);
 437                 if (channame && key)
 438                         key = strtok_r(NULL, ",", &lastkey);
 439         }
 440         return CONNECTED;
 441 } /* IRC_JOIN */
 442
 443
 444 /**
 445  * Handler for the IRC "PART" command.
 446  *
 447  * See RFC 2812, 3.2.2: "Part message".
 448  *
 449  * @param Client        The client from which this command has been received
 450  * @param Req           Request structure with prefix and all parameters
 451  * @returns             CONNECTED or DISCONNECTED
 452  */
 453 GLOBAL bool
 454 IRC_PART(CLIENT * Client, REQUEST * Req)
 455 {
 456         CLIENT *target;
 457         char *chan;
 458
 459         assert(Client != NULL);
 460         assert(Req != NULL);
 461
 462         if (Req->argc < 1 || Req->argc > 2)
 463                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 464                                           Client_ID(Client), Req->command);
 465
 466         /* Get the sender */
 467         if (Client_Type(Client) == CLIENT_SERVER)
 468                 target = Client_Search(Req->prefix);
 469         else
 470                 target = Client;
 471         if (!target)
 472                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 473                                           Client_ID(Client), Req->prefix);
 474
 475         /* Loop over all the given channel names */
 476         chan = strtok(Req->argv[0], ",");
 477
 478         /* Make sure that "chan" is not the empty string ("PART :") */
 479         if (! chan)
 480                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 481                                           Client_ID(Client), Req->command);
 482
 483         while (chan) {
 484                 Channel_Part(target, Client, chan,
 485                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 486                 chan = strtok(NULL, ",");
 487         }
 488
 489         /* Update idle time, if local client */
 490         if (Client_Conn(Client) > NONE)
 491                 Conn_UpdateIdle(Client_Conn(Client));
 492
 493         return CONNECTED;
 494 } /* IRC_PART */
 495
 496
 497 /**
 498  * Handler for the IRC "TOPIC" command.
 499  *
 500  * See RFC 2812, 3.2.4 "Topic message".
 501  *
 502  * @param Client        The client from which this command has been received
 503  * @param Req           Request structure with prefix and all parameters
 504  * @returns             CONNECTED or DISCONNECTED
 505  */
 506 GLOBAL bool
 507 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 508 {
 509         CHANNEL *chan;
 510         CLIENT *from;
 511         char *topic;
 512         bool onchannel, topicok, use_servermode, r;
 513
 514         assert( Client != NULL );
 515         assert( Req != NULL );
 516
 517         if (Req->argc < 1 || Req->argc > 2)
 518                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 519                                           Client_ID(Client), Req->command);
 520
 521         if (Client_Type(Client) == CLIENT_SERVER)
 522                 from = Client_Search(Req->prefix);
 523         else
 524                 from = Client;
 525
 526         if (!from)
 527                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 528                                           Client_ID(Client), Req->prefix);
 529
 530         chan = Channel_Search(Req->argv[0]);
 531         if (!chan)
 532                 return IRC_WriteStrClient(from, ERR_NOSUCHCHANNEL_MSG,
 533                                           Client_ID(from), Req->argv[0]);
 534
 535         Channel_CheckAdminRights(chan, Client, from,
 536                                  &onchannel, &topicok, &use_servermode);
 537
 538         if (!onchannel && !topicok)
 539                 return IRC_WriteStrClient(from, ERR_NOTONCHANNEL_MSG,
 540                                           Client_ID(from), Req->argv[0]);
 541
 542         if (Req->argc == 1) {
 543                 /* Request actual topic */
 544                 topic = Channel_Topic(chan);
 545                 if (*topic) {
 546                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 547                                                Client_ID(Client),
 548                                                Channel_Name(chan), topic);
 549 #ifndef STRICT_RFC
 550                         if (!r)
 551                                 return r;
 552                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 553                                                Client_ID(Client),
 554                                                Channel_Name(chan),
 555                                                Channel_TopicWho(chan),
 556                                                Channel_TopicTime(chan));
 557 #endif
 558                         return r;
 559                 }
 560                 else
 561                         return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 562                                                   Client_ID(from),
 563                                                   Channel_Name(chan));
 564         }
 565
 566         if (strchr(Channel_Modes(chan), 't')) {
 567                 /* Topic Lock. Is the user a channel or IRC operator? */
 568                 if (!topicok)
 569                         return IRC_WriteStrClient(from, ERR_CHANOPRIVSNEEDED_MSG,
 570                                                   Client_ID(from),
 571                                                   Channel_Name(chan));
 572         }
 573
 574         /* Set new topic */
 575         Channel_SetTopic(chan, from, Req->argv[1]);
 576         LogDebug("%s \"%s\" set topic on \"%s\": %s",
 577                  Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
 578                  Req->argv[1][0] ? Req->argv[1] : "<none>");
 579
 580         if (use_servermode)
 581                 from = Client_ThisServer();
 582
 583         /* Update channel and forward new topic to other servers */
 584         if (!Channel_IsLocal(chan))
 585                 IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
 586                                           Req->argv[0], Req->argv[1]);
 587         IRC_WriteStrChannelPrefix(Client, chan, from, false, "TOPIC %s :%s",
 588                                   Req->argv[0], Req->argv[1]);
 589
 590         if (Client_Type(Client) == CLIENT_USER)
 591                 return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
 592                                                 Req->argv[0], Req->argv[1]);
 593         else
 594                 return CONNECTED;
 595 } /* IRC_TOPIC */
 596
 597
 598 /**
 599  * Handler for the IRC "LIST" command.
 600  *
 601  * See RFC 2812, 3.2.6 "List message".
 602  *
 603  * This implementation handles the local case as well as the forwarding of the
 604  * LIST command to other servers in the IRC network.
 605  *
 606  * @param Client The client from which this command has been received.
 607  * @param Req Request structure with prefix and all parameters.
 608  * @return CONNECTED or DISCONNECTED.
 609  */
 610 GLOBAL bool
 611 IRC_LIST( CLIENT *Client, REQUEST *Req )
 612 {
 613         char *pattern;
 614         CHANNEL *chan;
 615         CLIENT *from, *target;
 616         int count = 0;
 617
 618         assert(Client != NULL);
 619         assert(Req != NULL);
 620
 621         /* Bad number of prameters? */
 622         if (Req->argc > 2)
 623                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 624                                           Client_ID(Client), Req->command);
 625
 626         if (Req->argc > 0)
 627                 pattern = strtok(Req->argv[0], ",");
 628         else
 629                 pattern = "*";
 630
 631         /* Get sender from prefix, if any */
 632         if (Client_Type(Client) == CLIENT_SERVER)
 633                 from = Client_Search(Req->prefix);
 634         else
 635                 from = Client;
 636
 637         if (!from)
 638                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 639                                           Client_ID(Client), Req->prefix);
 640
 641         if (Req->argc == 2) {
 642                 /* Forward to other server? */
 643                 target = Client_Search(Req->argv[1]);
 644                 if (! target || Client_Type(target) != CLIENT_SERVER)
 645                         return IRC_WriteStrClient(from, ERR_NOSUCHSERVER_MSG,
 646                                                   Client_ID(Client),
 647                                                   Req->argv[1]);
 648
 649                 if (target != Client_ThisServer()) {
 650                         /* Target is indeed an other server, forward it! */
 651                         return IRC_WriteStrClientPrefix(target, from,
 652                                                         "LIST %s :%s",
 653                                                         Client_ID(from),
 654                                                         Req->argv[1]);
 655                 }
 656         }
 657
 658         while (pattern) {
 659                 /* Loop through all the channels */
 660                 if (Req->argc > 0)
 661                         ngt_LowerStr(pattern);
 662                 chan = Channel_First();
 663                 while (chan) {
 664                         /* Check search pattern */
 665                         if (MatchCaseInsensitive(pattern, Channel_Name(chan))) {
 666                                 /* Gotcha! */
 667                                 if (!strchr(Channel_Modes(chan), 's')
 668                                     || Channel_IsMemberOf(chan, from)) {
 669                                         if (IRC_CheckListTooBig(from, count,
 670                                                                  MAX_RPL_LIST,
 671                                                                  "LIST"))
 672                                                 break;
 673                                         if (!IRC_WriteStrClient(from,
 674                                              RPL_LIST_MSG, Client_ID(from),
 675                                              Channel_Name(chan),
 676                                              Channel_MemberCount(chan),
 677                                              Channel_Topic( chan )))
 678                                                 return DISCONNECTED;
 679                                         count++;
 680                                 }
 681                         }
 682                         chan = Channel_Next(chan);
 683                 }
 684
 685                 /* Get next name ... */
 686                 if(Req->argc > 0)
 687                         pattern = strtok(NULL, ",");
 688                 else
 689                         pattern = NULL;
 690         }
 691
 692         IRC_SetPenalty(from, 2);
 693         return IRC_WriteStrClient(from, RPL_LISTEND_MSG, Client_ID(from));
 694 } /* IRC_LIST */
 695
 696
 697 /**
 698  * Handler for the IRC+ command "CHANINFO".
 699  *
 700  * See doc/Protocol.txt, section II.3:
 701  * "Exchange channel-modes, topics, and persistent channels".
 702  *
 703  * @param Client        The client from which this command has been received
 704  * @param Req           Request structure with prefix and all parameters
 705  * @returns             CONNECTED or DISCONNECTED
 706  */
 707 GLOBAL bool
 708 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 709 {
 710         char modes_add[COMMAND_LEN], l[16], *ptr;
 711         CLIENT *from;
 712         CHANNEL *chan;
 713         int arg_topic;
 714
 715         assert( Client != NULL );
 716         assert( Req != NULL );
 717
 718         /* Bad number of parameters? */
 719         if (Req->argc < 2 || Req->argc == 4 || Req->argc > 5)
 720                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 721                                           Client_ID(Client), Req->command);
 722
 723         /* Compatibility kludge */
 724         if( Req->argc == 5 ) arg_topic = 4;
 725         else if( Req->argc == 3 ) arg_topic = 2;
 726         else arg_topic = -1;
 727
 728         /* Search origin */
 729         from = Client_Search( Req->prefix );
 730         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 731
 732         /* Search or create channel */
 733         chan = Channel_Search( Req->argv[0] );
 734         if( ! chan ) chan = Channel_Create( Req->argv[0] );
 735         if( ! chan ) return CONNECTED;
 736
 737         if( Req->argv[1][0] == '+' )
 738         {
 739                 ptr = Channel_Modes( chan );
 740                 if( ! *ptr )
 741                 {
 742                         /* OK, this channel doesn't have modes jet, set the received ones: */
 743                         Channel_SetModes( chan, &Req->argv[1][1] );
 744
 745                         if( Req->argc == 5 )
 746                         {
 747                                 if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
 748                                 if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
 749                         }
 750                         else
 751                         {
 752                                 /* Delete modes which we never want to inherit */
 753                                 Channel_ModeDel( chan, 'l' );
 754                                 Channel_ModeDel( chan, 'k' );
 755                         }
 756
 757                         strcpy( modes_add, "" );
 758                         ptr = Channel_Modes( chan );
 759                         while( *ptr )
 760                         {
 761                                 if( *ptr == 'l' )
 762                                 {
 763                                         snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
 764                                         strlcat( modes_add, l, sizeof( modes_add ));
 765                                 }
 766                                 if( *ptr == 'k' )
 767                                 {
 768                                         strlcat( modes_add, " ", sizeof( modes_add ));
 769                                         strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
 770                                 }
 771                                 ptr++;
 772                         }
 773
 774                         /* Inform members of this channel */
 775                         IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
 776                 }
 777         }
 778         else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
 779
 780         if( arg_topic > 0 )
 781         {
 782                 /* We got a topic */
 783                 ptr = Channel_Topic( chan );
 784                 if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
 785                 {
 786                         /* OK, there is no topic jet */
 787                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 788                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 789                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 790                 }
 791         }
 792
 793         /* Forward CHANINFO to other serevrs */
 794         if( Req->argc == 5 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2], Req->argv[3], Req->argv[4] );
 795         else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
 796         else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
 797
 798         return CONNECTED;
 799 } /* IRC_CHANINFO */
 800
 801
 802 /* -eof- */