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 the channel is persistent (+P) and client is an IRC op:
 171          * make client chanop, if not disabled in configuration. */
 172         if (strchr(Channel_Modes(chan), 'P') && Conf_OperChanPAutoOp
 173             && strchr(Client_Modes(target), 'o'))
 174                 Channel_UserModeAdd(chan, target, 'o');
 175 } /* join_set_channelmodes */
 176
 177
 178 /**
 179  * Forward JOIN command to a specific server
 180  *
 181  * This function diffentiates between servers using RFC 2813 mode that
 182  * support the JOIN command with appended ASCII 7 character and channel
 183  * modes, and servers using RFC 1459 protocol which require separate JOIN
 184  * and MODE commands.
 185  *
 186  * @param To            Forward JOIN (and MODE) command to this peer server
 187  * @param Prefix        Client used to prefix the genrated commands
 188  * @param Data          Parameters of JOIN command to forward, probably
 189  *                      containing channel modes separated by ASCII 7.
 190  */
 191 static void
 192 cb_join_forward(CLIENT *To, CLIENT *Prefix, void *Data)
 193 {
 194         CONN_ID conn;
 195         char str[COMMAND_LEN], *ptr = NULL;
 196
 197         strlcpy(str, (char *)Data, sizeof(str));
 198         conn = Client_Conn(To);
 199
 200         if (Conn_Options(conn) & CONN_RFC1459) {
 201                 /* RFC 1459 compatibility mode, appended modes are NOT
 202                  * supported, so strip them off! */
 203                 ptr = strchr(str, 0x7);
 204                 if (ptr)
 205                         *ptr++ = '\0';
 206         }
 207
 208         IRC_WriteStrClientPrefix(To, Prefix, "JOIN %s", str);
 209         if (ptr && *ptr)
 210                 IRC_WriteStrClientPrefix(To, Prefix, "MODE %s +%s %s", str, ptr,
 211                                          Client_ID(Prefix));
 212 } /* cb_join_forward */
 213
 214
 215 /**
 216  * Forward JOIN command to all servers
 217  *
 218  * This function calls cb_join_forward(), which differentiates between
 219  * protocol implementations (e.g. RFC 2812, RFC 1459).
 220  *
 221  * @param Client        Client used to prefix the genrated commands
 222  * @param target        Forward JOIN (and MODE) command to this peer server
 223  * @param chan          Channel structure
 224  * @param channame      Channel name
 225  */
 226 static void
 227 join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 228                                         const char *channame)
 229 {
 230         char modes[CHANNEL_MODE_LEN], str[COMMAND_LEN];
 231
 232         /* RFC 2813, 4.2.1: channel modes are separated from the channel
 233          * name with ASCII 7, if any, and not spaces: */
 234         strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
 235         if (modes[1])
 236                 modes[0] = 0x7;
 237         else
 238                 modes[0] = '\0';
 239
 240         /* forward to other servers (if it is not a local channel) */
 241         if (!Channel_IsLocal(chan)) {
 242                 snprintf(str, sizeof(str), "%s%s", channame, modes);
 243                 IRC_WriteStrServersPrefixFlag_CB(Client, target, '\0',
 244                                                  cb_join_forward, str);
 245         }
 246
 247         /* tell users in this channel about the new client */
 248         IRC_WriteStrChannelPrefix(Client, chan, target, false,
 249                                   "JOIN :%s",  channame);
 250
 251         /* synchronize channel modes */
 252         if (modes[1]) {
 253                 IRC_WriteStrChannelPrefix(Client, chan, target, false,
 254                                           "MODE %s +%s %s", channame,
 255                                           &modes[1], Client_ID(target));
 256         }
 257 } /* join_forward */
 258
 259
 260 /**
 261  * Aknowledge user JOIN request and send "channel info" numerics.
 262  *
 263  * @param Client        Client used to prefix the genrated commands
 264  * @param target        Forward commands/numerics to this user
 265  * @param chan          Channel structure
 266  * @param channame      Channel name
 267  */
 268 static bool
 269 join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
 270                                         const char *channame)
 271 {
 272         const char *topic;
 273
 274         if (Client_Type(Client) != CLIENT_USER)
 275                 return true;
 276         /* acknowledge join */
 277         if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
 278                 return false;
 279
 280         /* Send topic to client, if any */
 281         topic = Channel_Topic(chan);
 282         assert(topic != NULL);
 283         if (*topic) {
 284                 if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
 285                         Client_ID(Client), channame, topic))
 286                                 return false;
 287 #ifndef STRICT_RFC
 288                 if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
 289                         Client_ID(Client), channame,
 290                         Channel_TopicWho(chan),
 291                         Channel_TopicTime(chan)))
 292                                 return false;
 293 #endif
 294         }
 295         /* send list of channel members to client */
 296         if (!IRC_Send_NAMES(Client, chan))
 297                 return false;
 298         return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client),
 299                                   Channel_Name(chan));
 300 } /* join_send_topic */
 301
 302
 303 /**
 304  * Handler for the IRC "JOIN" command.
 305  *
 306  * See RFC 2812, 3.2.1 "Join message"; RFC 2813, 4.2.1 "Join message".
 307  *
 308  * @param Client The client from which this command has been received
 309  * @param Req Request structure with prefix and all parameters
 310  * @returns CONNECTED or DISCONNECTED
 311  */
 312 GLOBAL bool
 313 IRC_JOIN( CLIENT *Client, REQUEST *Req )
 314 {
 315         char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 316         CLIENT *target;
 317         CHANNEL *chan;
 318
 319         assert (Client != NULL);
 320         assert (Req != NULL);
 321
 322         /* Bad number of arguments? */
 323         if (Req->argc < 1 || Req->argc > 2)
 324                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 325                                           Client_ID(Client), Req->command);
 326
 327         /* Who is the sender? */
 328         if (Client_Type(Client) == CLIENT_SERVER)
 329                 target = Client_Search(Req->prefix);
 330         else
 331                 target = Client;
 332
 333         if (!target)
 334                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 335                                           Client_ID(Client), Req->prefix);
 336
 337         /* Is argument "0"? */
 338         if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
 339                 return part_from_all_channels(Client, target);
 340
 341         /* Are channel keys given? */
 342         if (Req->argc > 1)
 343                 key = strtok_r(Req->argv[1], ",", &lastkey);
 344
 345         channame = Req->argv[0];
 346         channame = strtok_r(channame, ",", &lastchan);
 347
 348         /* Make sure that "channame" is not the empty string ("JOIN :") */
 349         if (! channame)
 350                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 351                                           Client_ID(Client), Req->command);
 352
 353         while (channame) {
 354                 flags = NULL;
 355
 356                 /* Did the server include channel-user-modes? */
 357                 if (Client_Type(Client) == CLIENT_SERVER) {
 358                         flags = strchr(channame, 0x7);
 359                         if (flags) {
 360                                 *flags = '\0';
 361                                 flags++;
 362                         }
 363                 }
 364
 365                 chan = Channel_Search(channame);
 366                 if (!chan && Conf_PredefChannelsOnly) {
 367                          /* channel must be created, but forbidden by config */
 368                         IRC_WriteStrClient(Client, ERR_NOSUCHCHANNEL_MSG,
 369                                            Client_ID(Client), channame);
 370                         goto join_next;
 371                 }
 372
 373                 /* Local client? */
 374                 if (Client_Type(Client) == CLIENT_USER) {
 375                         if (chan) {
 376                                 /* Already existing channel: already member? */
 377                                 if (Channel_IsMemberOf(chan, Client))
 378                                     goto join_next;
 379                         }
 380
 381                         /* Test if the user has reached the channel limit */
 382                         if ((Conf_MaxJoins > 0) &&
 383                             (Channel_CountForUser(Client) >= Conf_MaxJoins)) {
 384                                 if (!IRC_WriteStrClient(Client,
 385                                                 ERR_TOOMANYCHANNELS_MSG,
 386                                                 Client_ID(Client), channame))
 387                                         return DISCONNECTED;
 388                                 goto join_next;
 389                         }
 390
 391                         if (chan) {
 392                                 /* Already existing channel: check if the
 393                                  * client is allowed to join */
 394                                 if (!join_allowed(Client, chan, channame, key))
 395                                         goto join_next;
 396                         } else {
 397                                 /* New channel: first user will become channel
 398                                  * operator unless this is a modeless channel */
 399                                 if (*channame != '+')
 400                                         flags = "o";
 401                         }
 402
 403                         /* Local client: update idle time */
 404                         Conn_UpdateIdle(Client_Conn(Client));
 405                 } else {
 406                         /* Remote server: we don't need to know whether the
 407                          * client is invited or not, but we have to make sure
 408                          * that the "one shot" entries (generated by INVITE
 409                          * commands) in this list become deleted when a user
 410                          * joins a channel this way. */
 411                         if (chan)
 412                                 (void)Lists_Check(Channel_GetListInvites(chan),
 413                                                   target);
 414                 }
 415
 416                 /* Join channel (and create channel if it doesn't exist) */
 417                 if (!Channel_Join(target, channame))
 418                         goto join_next;
 419
 420                 if (!chan) { /* channel is new; it has been created above */
 421                         chan = Channel_Search(channame);
 422                         assert(chan != NULL);
 423                         if (Channel_IsModeless(chan)) {
 424                                 Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
 425                                 Channel_ModeAdd(chan, 'n'); /* no external msgs */
 426                         }
 427                 }
 428                 assert(chan != NULL);
 429
 430                 join_set_channelmodes(chan, target, flags);
 431
 432                 join_forward(Client, target, chan, channame);
 433
 434                 if (!join_send_topic(Client, target, chan, channame))
 435                         break; /* write error */
 436
 437         join_next:
 438                 /* next channel? */
 439                 channame = strtok_r(NULL, ",", &lastchan);
 440                 if (channame && key)
 441                         key = strtok_r(NULL, ",", &lastkey);
 442         }
 443         return CONNECTED;
 444 } /* IRC_JOIN */
 445
 446
 447 /**
 448  * Handler for the IRC "PART" command.
 449  *
 450  * See RFC 2812, 3.2.2: "Part message".
 451  *
 452  * @param Client        The client from which this command has been received
 453  * @param Req           Request structure with prefix and all parameters
 454  * @returns             CONNECTED or DISCONNECTED
 455  */
 456 GLOBAL bool
 457 IRC_PART(CLIENT * Client, REQUEST * Req)
 458 {
 459         CLIENT *target;
 460         char *chan;
 461
 462         assert(Client != NULL);
 463         assert(Req != NULL);
 464
 465         if (Req->argc < 1 || Req->argc > 2)
 466                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 467                                           Client_ID(Client), Req->command);
 468
 469         /* Get the sender */
 470         if (Client_Type(Client) == CLIENT_SERVER)
 471                 target = Client_Search(Req->prefix);
 472         else
 473                 target = Client;
 474         if (!target)
 475                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 476                                           Client_ID(Client), Req->prefix);
 477
 478         /* Loop over all the given channel names */
 479         chan = strtok(Req->argv[0], ",");
 480
 481         /* Make sure that "chan" is not the empty string ("PART :") */
 482         if (! chan)
 483                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 484                                           Client_ID(Client), Req->command);
 485
 486         while (chan) {
 487                 Channel_Part(target, Client, chan,
 488                              Req->argc > 1 ? Req->argv[1] : Client_ID(target));
 489                 chan = strtok(NULL, ",");
 490         }
 491
 492         /* Update idle time, if local client */
 493         if (Client_Conn(Client) > NONE)
 494                 Conn_UpdateIdle(Client_Conn(Client));
 495
 496         return CONNECTED;
 497 } /* IRC_PART */
 498
 499
 500 /**
 501  * Handler for the IRC "TOPIC" command.
 502  *
 503  * See RFC 2812, 3.2.4 "Topic message".
 504  *
 505  * @param Client        The client from which this command has been received
 506  * @param Req           Request structure with prefix and all parameters
 507  * @returns             CONNECTED or DISCONNECTED
 508  */
 509 GLOBAL bool
 510 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 511 {
 512         CHANNEL *chan;
 513         CLIENT *from;
 514         char *topic;
 515         bool r, topic_power;
 516
 517         assert( Client != NULL );
 518         assert( Req != NULL );
 519
 520         if (Req->argc < 1 || Req->argc > 2)
 521                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 522                                           Client_ID(Client), Req->command);
 523
 524         if (Client_Type(Client) == CLIENT_SERVER)
 525                 from = Client_Search(Req->prefix);
 526         else
 527                 from = Client;
 528
 529         if (!from)
 530                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 531                                           Client_ID(Client), Req->prefix);
 532
 533         chan = Channel_Search(Req->argv[0]);
 534         if (!chan)
 535                 return IRC_WriteStrClient(from, ERR_NOSUCHCHANNEL_MSG,
 536                                           Client_ID(from), Req->argv[0]);
 537
 538         /* Only remote servers and channel members are allowed to change the
 539          * channel topic, and IRC opreators when the Conf_OperCanMode option
 540          * is set in the server configuration. */
 541         if (Client_Type(Client) != CLIENT_SERVER) {
 542                 topic_power = Client_HasMode(from, 'o');
 543                 if (!Channel_IsMemberOf(chan, from)
 544                     && !(Conf_OperCanMode && topic_power))
 545                         return IRC_WriteStrClient(from, ERR_NOTONCHANNEL_MSG,
 546                                                   Client_ID(from), Req->argv[0]);
 547         } else
 548                 topic_power = true;
 549
 550         if (Req->argc == 1) {
 551                 /* Request actual topic */
 552                 topic = Channel_Topic(chan);
 553                 if (*topic) {
 554                         r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
 555                                                Client_ID(Client),
 556                                                Channel_Name(chan), topic);
 557 #ifndef STRICT_RFC
 558                         if (!r)
 559                                 return r;
 560                         r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
 561                                                Client_ID(Client),
 562                                                Channel_Name(chan),
 563                                                Channel_TopicWho(chan),
 564                                                Channel_TopicTime(chan));
 565 #endif
 566                         return r;
 567                 }
 568                 else
 569                         return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
 570                                                   Client_ID(from),
 571                                                   Channel_Name(chan));
 572         }
 573
 574         if (strchr(Channel_Modes(chan), 't')) {
 575                 /* Topic Lock. Is the user a channel op or IRC operator? */
 576                 if(!topic_power &&
 577                    !strchr(Channel_UserModes(chan, from), 'h') &&
 578                    !strchr(Channel_UserModes(chan, from), 'o') &&
 579                    !strchr(Channel_UserModes(chan, from), 'a') &&
 580                    !strchr(Channel_UserModes(chan, from), 'q'))
 581                         return IRC_WriteStrClient(from, ERR_CHANOPRIVSNEEDED_MSG,
 582                                                   Client_ID(from),
 583                                                   Channel_Name(chan));
 584         }
 585
 586         /* Set new topic */
 587         Channel_SetTopic(chan, from, Req->argv[1]);
 588         LogDebug("%s \"%s\" set topic on \"%s\": %s",
 589                  Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
 590                  Req->argv[1][0] ? Req->argv[1] : "<none>");
 591
 592         if (Conf_OperServerMode)
 593                 from = Client_ThisServer();
 594
 595         /* Update channel and forward new topic to other servers */
 596         if (!Channel_IsLocal(chan))
 597                 IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
 598                                           Req->argv[0], Req->argv[1]);
 599         IRC_WriteStrChannelPrefix(Client, chan, from, false, "TOPIC %s :%s",
 600                                   Req->argv[0], Req->argv[1]);
 601
 602         if (Client_Type(Client) == CLIENT_USER)
 603                 return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
 604                                                 Req->argv[0], Req->argv[1]);
 605         else
 606                 return CONNECTED;
 607 } /* IRC_TOPIC */
 608
 609
 610 /**
 611  * Handler for the IRC "LIST" command.
 612  *
 613  * See RFC 2812, 3.2.6 "List message".
 614  *
 615  * This implementation handles the local case as well as the forwarding of the
 616  * LIST command to other servers in the IRC network.
 617  *
 618  * @param Client The client from which this command has been received.
 619  * @param Req Request structure with prefix and all parameters.
 620  * @return CONNECTED or DISCONNECTED.
 621  */
 622 GLOBAL bool
 623 IRC_LIST( CLIENT *Client, REQUEST *Req )
 624 {
 625         char *pattern;
 626         CHANNEL *chan;
 627         CLIENT *from, *target;
 628         int count = 0;
 629
 630         assert(Client != NULL);
 631         assert(Req != NULL);
 632
 633         /* Bad number of prameters? */
 634         if (Req->argc > 2)
 635                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 636                                           Client_ID(Client), Req->command);
 637
 638         if (Req->argc > 0)
 639                 pattern = strtok(Req->argv[0], ",");
 640         else
 641                 pattern = "*";
 642
 643         /* Get sender from prefix, if any */
 644         if (Client_Type(Client) == CLIENT_SERVER)
 645                 from = Client_Search(Req->prefix);
 646         else
 647                 from = Client;
 648
 649         if (!from)
 650                 return IRC_WriteStrClient(Client, ERR_NOSUCHSERVER_MSG,
 651                                           Client_ID(Client), Req->prefix);
 652
 653         if (Req->argc == 2) {
 654                 /* Forward to other server? */
 655                 target = Client_Search(Req->argv[1]);
 656                 if (! target || Client_Type(target) != CLIENT_SERVER)
 657                         return IRC_WriteStrClient(from, ERR_NOSUCHSERVER_MSG,
 658                                                   Client_ID(Client),
 659                                                   Req->argv[1]);
 660
 661                 if (target != Client_ThisServer()) {
 662                         /* Target is indeed an other server, forward it! */
 663                         return IRC_WriteStrClientPrefix(target, from,
 664                                                         "LIST %s :%s",
 665                                                         Req->argv[0],
 666                                                         Req->argv[1]);
 667                 }
 668         }
 669
 670         while (pattern) {
 671                 /* Loop through all the channels */
 672                 if (Req->argc > 0)
 673                         ngt_LowerStr(pattern);
 674                 chan = Channel_First();
 675                 while (chan) {
 676                         /* Check search pattern */
 677                         if (MatchCaseInsensitive(pattern, Channel_Name(chan))) {
 678                                 /* Gotcha! */
 679                                 if (!strchr(Channel_Modes(chan), 's')
 680                                     || Channel_IsMemberOf(chan, from)
 681                                     || (!Conf_MorePrivacy && Client_OperByMe(Client))) {
 682                                         if ((Conf_MaxListSize > 0)
 683                                             && IRC_CheckListTooBig(from, count,
 684                                                                    Conf_MaxListSize,
 685                                                                    "LIST"))
 686                                                 break;
 687                                         if (!IRC_WriteStrClient(from,
 688                                              RPL_LIST_MSG, Client_ID(from),
 689                                              Channel_Name(chan),
 690                                              Channel_MemberCount(chan),
 691                                              Channel_Topic( chan )))
 692                                                 return DISCONNECTED;
 693                                         count++;
 694                                 }
 695                         }
 696                         chan = Channel_Next(chan);
 697                 }
 698
 699                 /* Get next name ... */
 700                 if(Req->argc > 0)
 701                         pattern = strtok(NULL, ",");
 702                 else
 703                         pattern = NULL;
 704         }
 705
 706         IRC_SetPenalty(from, 2);
 707         return IRC_WriteStrClient(from, RPL_LISTEND_MSG, Client_ID(from));
 708 } /* IRC_LIST */
 709
 710
 711 /**
 712  * Handler for the IRC+ command "CHANINFO".
 713  *
 714  * See doc/Protocol.txt, section II.3:
 715  * "Exchange channel-modes, topics, and persistent channels".
 716  *
 717  * @param Client        The client from which this command has been received
 718  * @param Req           Request structure with prefix and all parameters
 719  * @returns             CONNECTED or DISCONNECTED
 720  */
 721 GLOBAL bool
 722 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 723 {
 724         char modes_add[COMMAND_LEN], l[16], *ptr;
 725         CLIENT *from;
 726         CHANNEL *chan;
 727         int arg_topic;
 728
 729         assert( Client != NULL );
 730         assert( Req != NULL );
 731
 732         /* Bad number of parameters? */
 733         if (Req->argc < 2 || Req->argc == 4 || Req->argc > 5)
 734                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 735                                           Client_ID(Client), Req->command);
 736
 737         /* Compatibility kludge */
 738         if( Req->argc == 5 ) arg_topic = 4;
 739         else if( Req->argc == 3 ) arg_topic = 2;
 740         else arg_topic = -1;
 741
 742         /* Search origin */
 743         from = Client_Search( Req->prefix );
 744         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 745
 746         /* Search or create channel */
 747         chan = Channel_Search( Req->argv[0] );
 748         if( ! chan ) chan = Channel_Create( Req->argv[0] );
 749         if( ! chan ) return CONNECTED;
 750
 751         if( Req->argv[1][0] == '+' )
 752         {
 753                 ptr = Channel_Modes( chan );
 754                 if( ! *ptr )
 755                 {
 756                         /* OK, this channel doesn't have modes jet, set the received ones: */
 757                         Channel_SetModes( chan, &Req->argv[1][1] );
 758
 759                         if( Req->argc == 5 )
 760                         {
 761                                 if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
 762                                 if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
 763                         }
 764                         else
 765                         {
 766                                 /* Delete modes which we never want to inherit */
 767                                 Channel_ModeDel( chan, 'l' );
 768                                 Channel_ModeDel( chan, 'k' );
 769                         }
 770
 771                         strcpy( modes_add, "" );
 772                         ptr = Channel_Modes( chan );
 773                         while( *ptr )
 774                         {
 775                                 if( *ptr == 'l' )
 776                                 {
 777                                         snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
 778                                         strlcat( modes_add, l, sizeof( modes_add ));
 779                                 }
 780                                 if( *ptr == 'k' )
 781                                 {
 782                                         strlcat( modes_add, " ", sizeof( modes_add ));
 783                                         strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
 784                                 }
 785                                 ptr++;
 786                         }
 787
 788                         /* Inform members of this channel */
 789                         IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
 790                 }
 791         }
 792         else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
 793
 794         if( arg_topic > 0 )
 795         {
 796                 /* We got a topic */
 797                 ptr = Channel_Topic( chan );
 798                 if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
 799                 {
 800                         /* OK, there is no topic jet */
 801                         Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
 802                         IRC_WriteStrChannelPrefix(Client, chan, from, false,
 803                              "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 804                 }
 805         }
 806
 807         /* Forward CHANINFO to other serevrs */
 808         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] );
 809         else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
 810         else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
 811
 812         return CONNECTED;
 813 } /* IRC_CHANINFO */
 814
 815
 816 /* -eof- */