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, is_exception;
  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_exception = Lists_Check(Channel_GetListExcepts(chan), Client);
  94         is_invited = Lists_Check(Channel_GetListInvites(chan), Client);
  95
  96         if (is_banned && !is_invited && !is_exception) {
  97                 /* Client is banned from channel (and not on invite list) */
  98                 IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG,
  99                                    Client_ID(Client), channame);
 100                 return false;
 101         }
 102
 103         channel_modes = Channel_Modes(chan);
 104         if (strchr(channel_modes, 'i') && !is_invited) {
 105                 /* Channel is "invite-only" and client is not on invite list */
 106                 IRC_WriteStrClient(Client, ERR_INVITEONLYCHAN_MSG,
 107                                    Client_ID(Client), channame);
 108                 return false;
 109         }
 110
 111         if (!Channel_CheckKey(chan, Client, key ? key : "")) {
 112                 /* Channel is protected by a channel key and the client
 113                  * didn't specify the correct one */
 114                 IRC_WriteStrClient(Client, ERR_BADCHANNELKEY_MSG,
 115                                    Client_ID(Client), channame);
 116                 return false;
 117         }
 118
 119         if (strchr(channel_modes, 'l') &&
 120             (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
 121                 /* There are more clints joined to this channel than allowed */
 122                 IRC_WriteStrClient(Client, ERR_CHANNELISFULL_MSG,
 123                                    Client_ID(Client), channame);
 124                 return false;
 125         }
 126
 127         if (strchr(channel_modes, 'z') && !Conn_UsesSSL(Client_Conn(Client))) {
 128                 /* Only "secure" clients are allowed, but clients doesn't
 129                  * use SSL encryption */
 130                 IRC_WriteStrClient(Client, ERR_SECURECHANNEL_MSG,
 131                                    Client_ID(Client), channame);
 132                 return false;
 133         }
 134
 135         if (strchr(channel_modes, 'O') && !Client_OperByMe(Client)) {
 136                 /* Only IRC operators are allowed! */
 137                 IRC_WriteStrClient(Client, ERR_OPONLYCHANNEL_MSG,
 138                                    Client_ID(Client), channame);
 139                 return false;
 140         }
 141
 142         if (strchr(channel_modes, 'R') && !strchr(Client_Modes(Client), 'R')) {
 143                 /* Only registered users are allowed! */
 144                 IRC_WriteStrClient(Client, ERR_REGONLYCHANNEL_MSG,
 145                                    Client_ID(Client), channame);
 146                 return false;
 147         }
 148
 149         return true;
 150 } /* join_allowed */
 151
 152
 153 /**
 154  * Set user channel modes.
 155  *
 156  * @param chan          Channel
 157  * @param target        User to set modes for
 158  * @param flags         Channel modes to add
 159  */
 160 static void
 161 join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
 162 {
 163         if (flags) {
 164                 while (*flags) {
 165                         Channel_UserModeAdd(chan, target, *flags);
 166                         flags++;
 167                 }
 168         }
 169
 170         /* If channel persistent and client is ircop: make client chanop */
 171         if (strchr(Channel_Modes(chan), 'P') && strchr(Client_Modes(target), 'o'))
 172                 Channel_UserModeAdd(chan, target, 'o');
 173 } /* join_set_channelmodes */
 174
 175
 176 /**
 177  * Forward JOIN command to a specific server
 178  *
 179  * This function diffentiates between servers using RFC 2813 mode that
 180  * support the JOIN command with appended ASCII 7 character and channel
 181  * modes, and servers using RFC 1459 protocol which require separate JOIN
 182  * and MODE commands.
 183  *
 184  * @param To            Forward JOIN (and MODE) command to this peer server
 185  * @param Prefix        Client used to prefix the genrated commands
 186  * @param Data          Parameters of JOIN command to forward, probably
 187  *                      containing channel modes separated by ASCII 7.
 188  */
 189 static void
 190 cb_join_forward(CLIENT *To, CLIENT *Prefix, void *Data)
 191 {
 192         CONN_ID conn;
 193         char str[COMMAND_LEN], *ptr = NULL;
 194
 195         strlcpy(str, (char *)Data, sizeof(str));
 196         conn = Client_Conn(To);
 197
 198         if (Conn_Options(conn) & CONN_RFC1459) {
 199                 /* RFC 1459 compatibility mode, appended modes are NOT
 200                  * supported, so strip them off! */
 201                 ptr = strchr(str, 0x7);
 202                 if (ptr)
 203                         *ptr++ = '\0';
 204         }
 205
 206         IRC_WriteStrClientPrefix(To, Prefix, "JOIN %s", str);
 207         if (ptr && *ptr)
 208                 IRC_WriteStrClientPrefix(To, Prefix, "MODE %s +%s %s", str, ptr,
 209                                          Client_ID(Prefix));
 210 } /* cb_join_forward */
 211
 212
 213 /**
 214  * Forward JOIN command to all servers
 215  *
 216  * This function calls cb_join_forward(), which differentiates between
 217  * protocol implementations (e.g. RFC 2812, RFC 1459).
 218  *
 219  * @param Client        Client used to prefix the genrated commands
 220  * @param target        Forward JOIN (and MODE) command to this peer server
 221  * @param chan          Channel structure
 222  * @param channame      Channel name
 223  */
 224 static void
 225 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 226                                         const char *channame)
 227 {
 228         char modes[CHANNEL_MODE_LEN], str[COMMAND_LEN];
 229
 230         /* RFC 2813, 4.2.1: channel modes are separated from the channel
 231          * name with ASCII 7, if any, and not spaces: */
 232         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 233         if (modes[1])
 234                 modes[0] = 0x7;
 235         else
 236                 modes[0] = '\0';
 237
 238         /* forward to other servers (if it is not a local channel) */
 239         if (!Channel_IsLocal(chan)) {
 240                 snprintf(str, sizeof(str), "%s%s", channame, modes);
 241                 IRC_WriteStrServersPrefixFlag_CB(Client, target, '\0',
 242                                                  cb_join_forward, str);
 243         }
 244
 245         /* tell users in this channel about the new client */
 246         IRC_WriteStrChannelPrefix(Client, chan, target, false,
 247                                   "JOIN :%s",  channame);
 248
 249         /* synchronize channel modes */
 250         if (modes[1]) {
 251                 IRC_WriteStrChannelPrefix(Client, chan, target, false,
 252                                           "MODE %s +%s %s", channame,
 253                                           &modes[1], Client_ID(target));
 254         }
 255 } /* join_forward */
 256
 257
 258 /**
 259  * Aknowledge user JOIN request and send "channel info" numerics.
 260  *
 261  * @param Client        Client used to prefix the genrated commands
 262  * @param target        Forward commands/numerics to this user
 263  * @param chan          Channel structure
 264  * @param channame      Channel name
 265  */
 266 static bool
 267 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 268                                         const char *channame)
 269 {
 270         const char *topic;
 271
 272         if (Client_Type(Client) != CLIENT_USER)
 273                 return true;
 274         /* acknowledge join */
 275         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 276                 return false;
 277
 278         /* Send topic to client, if any */
 279         topic = Channel_Topic(chan);
 280         assert(topic != NULL);
 281         if (*topic) {
 282                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 283                         Client_ID(Client), channame, topic))
 284                                 return false;
 285 #ifndef STRICT_RFC
 286                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 287                         Client_ID(Client), channame,
 288                         Channel_TopicWho(chan),
 289                         Channel_TopicTime(chan)))
 290                                 return false;
 291 #endif
 292         }
 293         /* send list of channel members to client */
 294         if (!IRC_Send_NAMES(Client, chan))
 295                 return false;
 296         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client),
 297                                   Channel_Name(chan));
 298 } /* join_send_topic */
 299
 300
 301 /**
 302  * Handler for the IRC "JOIN" command.
 303  *
 304  * See RFC 2812, 3.2.1 "Join message"; RFC 2813, 4.2.1 "Join message".
 305  *
 306  * @param Client The client from which this command has been received
 307  * @param Req Request structure with prefix and all parameters
 308  * @returns CONNECTED or DISCONNECTED
 309  */
 310 GLOBAL bool
 311 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 312 {
 313         char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 314         CLIENT *target;
 315         CHANNEL *chan;
 316
 317         assert (Client != NULL);
 318         assert (Req != NULL);
 319
 320         /* Bad number of arguments? */
 321         if (Req->argc < 1 || Req->argc > 2)
 322                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 323                                           Client_ID(Client), Req->command);
 324
 325         /* Who is the sender? */
 326         if (Client_Type(Client) == CLIENT_SERVER)
 327                 target = Client_Search(Req->prefix);
 328         else
 329                 target = Client;
 330
 331         if (!target)
 332                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 333                                           Client_ID(Client), Req->prefix);
 334
 335         /* Is argument "0"? */
 336         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 337                 return part_from_all_channels(Client, target);
 338
 339         /* Are channel keys given? */
 340         if (Req->argc > 1)
 341                 key = strtok_r(Req->argv[1], ",", &lastkey);
 342
 343         channame = Req->argv[0];
 344         channame = strtok_r(channame, ",", &lastchan);
 345
 346         /* Make sure that "channame" is not the empty string ("JOIN :") */
 347         if (! channame)
 348                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 349                                           Client_ID(Client), Req->command);
 350
 351         while (channame) {
 352                 flags = NULL;
 353
 354                 /* Did the server include channel-user-modes? */
 355                 if (Client_Type(Client) == CLIENT_SERVER) {
 356                         flags = strchr(channame, 0x7);
 357                         if (flags) {
 358                                 *flags = '\0';
 359                                 flags++;
 360                         }
 361                 }
 362
 363                 chan = Channel_Search(channame);
 364                 if (!chan && Conf_PredefChannelsOnly) {
 365                          /* channel must be created, but forbidden by config */
 366                         IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG,
 367                                            Client_ID(Client), channame);
 368                         goto join_next;
 369                 }
 370
 371                 /* Local client? */
 372                 if (Client_Type(Client) == CLIENT_USER) {
 373                         if (chan) {
 374                                 /* Already existing channel: already member? */
 375                                 if (Channel_IsMemberOf(chan, Client))
 376                                     goto join_next;
 377                         }
 378
 379                         /* Test if the user has reached the channel limit */
 380                         if ((Conf_MaxJoins > 0) &&
 381                             (Channel_CountForUser(Client) >= Conf_MaxJoins)) {
 382                                 if (!IRC_WriteStrClient(Client,
 383                                                 ERR_TOOMANYCHANNELS_MSG,
 384                                                 Client_ID(Client), channame))
 385                                         return DISCONNECTED;
 386                                 goto join_next;
 387                         }
 388
 389                         if (chan) {
 390                                 /* Already existing channel: check if the
 391                                  * client is allowed to join */
 392                                 if (!join_allowed(Client, chan, channame, key))
 393                                         goto join_next;
 394                         } else {
 395                                 /* New channel: first user will become channel
 396                                  * operator unless this is a modeless channel */
 397                                 if (*channame != '+')
 398                                         flags = "o";
 399                         }
 400
 401                         /* Local client: update idle time */
 402                         Conn_UpdateIdle(Client_Conn(Client));
 403                 } else {
 404                         /* Remote server: we don't need to know whether the
 405                          * client is invited or not, but we have to make sure
 406                          * that the "one shot" entries (generated by INVITE
 407                          * commands) in this list become deleted when a user
 408                          * joins a channel this way. */
 409                         if (chan)
 410                                 (void)Lists_Check(Channel_GetListInvites(chan),
 411                                                   target);
 412                 }
 413
 414                 /* Join channel (and create channel if it doesn't exist) */
 415                 if (!Channel_Join(target, channame))
 416                         goto join_next;
 417
 418                 if (!chan) { /* channel is new; it has been created above */
 419                         chan = Channel_Search(channame);
 420                         assert(chan != NULL);
 421                         if (Channel_IsModeless(chan)) {
 422                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 423                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 424                         }
 425                 }
 426                 assert(chan != NULL);
 427
 428                 join_set_channelmodes(chan, target, flags);
 429
 430                 join_forward(Client, target, chan, channame);
 431
 432                 if (!join_send_topic(Client, target, chan, channame))
 433                         break; /* write error */
 434
 435         join_next:
 436                 /* next channel? */
 437                 channame = strtok_r(NULL, ",", &lastchan);
 438                 if (channame && key)
 439                         key = strtok_r(NULL, ",", &lastkey);
 440         }
 441         return CONNECTED;
 442 } /* IRC_JOIN */
 443
 444
 445 /**
 446  * Handler for the IRC "PART" command.
 447  *
 448  * See RFC 2812, 3.2.2: "Part message".
 449  *
 450  * @param Client        The client from which this command has been received
 451  * @param Req           Request structure with prefix and all parameters
 452  * @returns             CONNECTED or DISCONNECTED
 453  */
 454 GLOBAL bool
 455 IRC_PART(CLIENT * Client, REQUEST * Req)
 456 {
 457         CLIENT *target;
 458         char *chan;
 459
 460         assert(Client != NULL);
 461         assert(Req != NULL);
 462
 463         if (Req->argc < 1 || Req->argc > 2)
 464                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 465                                           Client_ID(Client), Req->command);
 466
 467         /* Get the sender */
 468         if (Client_Type(Client) == CLIENT_SERVER)
 469                 target = Client_Search(Req->prefix);
 470         else
 471                 target = Client;
 472         if (!target)
 473                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 474                                           Client_ID(Client), Req->prefix);
 475
 476         /* Loop over all the given channel names */
 477         chan = strtok(Req->argv[0], ",");
 478
 479         /* Make sure that "chan" is not the empty string ("PART :") */
 480         if (! chan)
 481                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 482                                           Client_ID(Client), Req->command);
 483
 484         while (chan) {
 485                 Channel_Part(target, Client, chan,
 486                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 487                 chan = strtok(NULL, ",");
 488         }
 489
 490         /* Update idle time, if local client */
 491         if (Client_Conn(Client) > NONE)
 492                 Conn_UpdateIdle(Client_Conn(Client));
 493
 494         return CONNECTED;
 495 } /* IRC_PART */
 496
 497
 498 /**
 499  * Handler for the IRC "TOPIC" command.
 500  *
 501  * See RFC 2812, 3.2.4 "Topic message".
 502  *
 503  * @param Client        The client from which this command has been received
 504  * @param Req           Request structure with prefix and all parameters
 505  * @returns             CONNECTED or DISCONNECTED
 506  */
 507 GLOBAL bool
 508 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 509 {
 510         CHANNEL *chan;
 511         CLIENT *from;
 512         char *topic;
 513         bool r, is_oper;
 514
 515         assert( Client != NULL );
 516         assert( Req != NULL );
 517
 518         if (Req->argc < 1 || Req->argc > 2)
 519                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 520                                           Client_ID(Client), Req->command);
 521
 522         if (Client_Type(Client) == CLIENT_SERVER)
 523                 from = Client_Search(Req->prefix);
 524         else
 525                 from = Client;
 526
 527         if (!from)
 528                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 529                                           Client_ID(Client), Req->prefix);
 530
 531         chan = Channel_Search(Req->argv[0]);
 532         if (!chan)
 533                 return IRC_WriteStrClient(from, ERR_NOSUCHCHANNEL_MSG,
 534                                           Client_ID(from), Req->argv[0]);
 535
 536         /* Only IRC opers and channel members allowed */
 537         is_oper = Client_OperByMe(from);
 538         if (!Channel_IsMemberOf(chan, from) && !is_oper)
 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 op or IRC operator? */
 568                 if(!strchr(Channel_UserModes(chan, from), 'h') &&
 569                    !strchr(Channel_UserModes(chan, from), 'o') &&
 570                    !strchr(Channel_UserModes(chan, from), 'a') &&
 571                    !strchr(Channel_UserModes(chan, from), 'q') &&
 572                    !is_oper)
 573                         return IRC_WriteStrClient(from, ERR_CHANOPRIVSNEEDED_MSG,
 574                                                   Client_ID(from),
 575                                                   Channel_Name(chan));
 576         }
 577
 578         /* Set new topic */
 579         Channel_SetTopic(chan, from, Req->argv[1]);
 580         LogDebug("%s \"%s\" set topic on \"%s\": %s",
 581                  Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
 582                  Req->argv[1][0] ? Req->argv[1] : "<none>");
 583
 584         if (Conf_OperServerMode)
 585                 from = Client_ThisServer();
 586
 587         /* Update channel and forward new topic to other servers */
 588         if (!Channel_IsLocal(chan))
 589                 IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
 590                                           Req->argv[0], Req->argv[1]);
 591         IRC_WriteStrChannelPrefix(Client, chan, from, false, "TOPIC %s :%s",
 592                                   Req->argv[0], Req->argv[1]);
 593
 594         if (Client_Type(Client) == CLIENT_USER)
 595                 return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
 596                                                 Req->argv[0], Req->argv[1]);
 597         else
 598                 return CONNECTED;
 599 } /* IRC_TOPIC */
 600
 601
 602 /**
 603  * Handler for the IRC "LIST" command.
 604  *
 605  * See RFC 2812, 3.2.6 "List message".
 606  *
 607  * This implementation handles the local case as well as the forwarding of the
 608  * LIST command to other servers in the IRC network.
 609  *
 610  * @param Client The client from which this command has been received.
 611  * @param Req Request structure with prefix and all parameters.
 612  * @return CONNECTED or DISCONNECTED.
 613  */
 614 GLOBAL bool
 615 IRC_LIST( CLIENT *Client, REQUEST *Req )
 616 {
 617         char *pattern;
 618         CHANNEL *chan;
 619         CLIENT *from, *target;
 620         int count = 0;
 621
 622         assert(Client != NULL);
 623         assert(Req != NULL);
 624
 625         /* Bad number of prameters? */
 626         if (Req->argc > 2)
 627                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 628                                           Client_ID(Client), Req->command);
 629
 630         if (Req->argc > 0)
 631                 pattern = strtok(Req->argv[0], ",");
 632         else
 633                 pattern = "*";
 634
 635         /* Get sender from prefix, if any */
 636         if (Client_Type(Client) == CLIENT_SERVER)
 637                 from = Client_Search(Req->prefix);
 638         else
 639                 from = Client;
 640
 641         if (!from)
 642                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 643                                           Client_ID(Client), Req->prefix);
 644
 645         if (Req->argc == 2) {
 646                 /* Forward to other server? */
 647                 target = Client_Search(Req->argv[1]);
 648                 if (! target || Client_Type(target) != CLIENT_SERVER)
 649                         return IRC_WriteStrClient(from, ERR_NOSUCHSERVER_MSG,
 650                                                   Client_ID(Client),
 651                                                   Req->argv[1]);
 652
 653                 if (target != Client_ThisServer()) {
 654                         /* Target is indeed an other server, forward it! */
 655                         return IRC_WriteStrClientPrefix(target, from,
 656                                                         "LIST %s :%s",
 657                                                         Req->argv[0],
 658                                                         Req->argv[1]);
 659                 }
 660         }
 661
 662         while (pattern) {
 663                 /* Loop through all the channels */
 664                 if (Req->argc > 0)
 665                         ngt_LowerStr(pattern);
 666                 chan = Channel_First();
 667                 while (chan) {
 668                         /* Check search pattern */
 669                         if (MatchCaseInsensitive(pattern, Channel_Name(chan))) {
 670                                 /* Gotcha! */
 671                                 if (!strchr(Channel_Modes(chan), 's')
 672                                     || Channel_IsMemberOf(chan, from)) {
 673                                         if (IRC_CheckListTooBig(from, count,
 674                                                                  MAX_RPL_LIST,
 675                                                                  "LIST"))
 676                                                 break;
 677                                         if (!IRC_WriteStrClient(from,
 678                                              RPL_LIST_MSG, Client_ID(from),
 679                                              Channel_Name(chan),
 680                                              Channel_MemberCount(chan),
 681                                              Channel_Topic( chan )))
 682                                                 return DISCONNECTED;
 683                                         count++;
 684                                 }
 685                         }
 686                         chan = Channel_Next(chan);
 687                 }
 688
 689                 /* Get next name ... */
 690                 if(Req->argc > 0)
 691                         pattern = strtok(NULL, ",");
 692                 else
 693                         pattern = NULL;
 694         }
 695
 696         IRC_SetPenalty(from, 2);
 697         return IRC_WriteStrClient(from, RPL_LISTEND_MSG, Client_ID(from));
 698 } /* IRC_LIST */
 699
 700
 701 /**
 702  * Handler for the IRC+ command "CHANINFO".
 703  *
 704  * See doc/Protocol.txt, section II.3:
 705  * "Exchange channel-modes, topics, and persistent channels".
 706  *
 707  * @param Client        The client from which this command has been received
 708  * @param Req           Request structure with prefix and all parameters
 709  * @returns             CONNECTED or DISCONNECTED
 710  */
 711 GLOBAL bool
 712 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 713 {
 714         char modes_add[COMMAND_LEN], l[16], *ptr;
 715         CLIENT *from;
 716         CHANNEL *chan;
 717         int arg_topic;
 718
 719         assert( Client != NULL );
 720         assert( Req != NULL );
 721
 722         /* Bad number of parameters? */
 723         if (Req->argc < 2 || Req->argc == 4 || Req->argc > 5)
 724                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 725                                           Client_ID(Client), Req->command);
 726
 727         /* Compatibility kludge */
 728         if( Req->argc == 5 ) arg_topic = 4;
 729         else if( Req->argc == 3 ) arg_topic = 2;
 730         else arg_topic = -1;
 731
 732         /* Search origin */
 733         from = Client_Search( Req->prefix );
 734         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 735
 736         /* Search or create channel */
 737         chan = Channel_Search( Req->argv[0] );
 738         if( ! chan ) chan = Channel_Create( Req->argv[0] );
 739         if( ! chan ) return CONNECTED;
 740
 741         if( Req->argv[1][0] == '+' )
 742         {
 743                 ptr = Channel_Modes( chan );
 744                 if( ! *ptr )
 745                 {
 746                         /* OK, this channel doesn't have modes jet, set the received ones: */
 747                         Channel_SetModes( chan, &Req->argv[1][1] );
 748
 749                         if( Req->argc == 5 )
 750                         {
 751                                 if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
 752                                 if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
 753                         }
 754                         else
 755                         {
 756                                 /* Delete modes which we never want to inherit */
 757                                 Channel_ModeDel( chan, 'l' );
 758                                 Channel_ModeDel( chan, 'k' );
 759                         }
 760
 761                         strcpy( modes_add, "" );
 762                         ptr = Channel_Modes( chan );
 763                         while( *ptr )
 764                         {
 765                                 if( *ptr == 'l' )
 766                                 {
 767                                         snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
 768                                         strlcat( modes_add, l, sizeof( modes_add ));
 769                                 }
 770                                 if( *ptr == 'k' )
 771                                 {
 772                                         strlcat( modes_add, " ", sizeof( modes_add ));
 773                                         strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
 774                                 }
 775                                 ptr++;
 776                         }
 777
 778                         /* Inform members of this channel */
 779                         IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
 780                 }
 781         }
 782         else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
 783
 784         if( arg_topic > 0 )
 785         {
 786                 /* We got a topic */
 787                 ptr = Channel_Topic( chan );
 788                 if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
 789                 {
 790                         /* OK, there is no topic jet */
 791                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 792                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 793                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 794                 }
 795         }
 796
 797         /* Forward CHANINFO to other serevrs */
 798         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] );
 799         else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
 800         else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
 801
 802         return CONNECTED;
 803 } /* IRC_CHANINFO */
 804
 805
 806 /* -eof- */