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