src/ngircd/irc.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "ngircd.h"
  25 #include "conn-func.h"
  26 #include "conf.h"
  27 #include "channel.h"
  28 #include "conn-encoding.h"
  29 #include "defines.h"
  30 #include "irc-write.h"
  31 #include "log.h"
  32 #include "match.h"
  33 #include "messages.h"
  34 #include "parse.h"
  35 #include "tool.h"
  36
  37 #include "exp.h"
  38 #include "irc.h"
  39
  40
  41 static char *Option_String PARAMS((CONN_ID Idx));
  42 static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType,
  43                                  bool SendErrors));
  44 static bool Send_Message_Mask PARAMS((CLIENT *from, char *command,
  45                                       char *targetMask, char *message,
  46                                       bool SendErrors));
  47
  48
  49 /**
  50  * Check if a list limit is reached and inform client accordingly.
  51  *
  52  * @param From The client.
  53  * @param Count Reply item count.
  54  * @param Limit Reply limit.
  55  * @param Name Name of the list.
  56  * @return true if list limit has been reached; false otherwise.
  57  */
  58 GLOBAL bool
  59 IRC_CheckListTooBig(CLIENT *From, const int Count, const int Limit,
  60                     const char *Name)
  61 {
  62         assert(From != NULL);
  63         assert(Count >= 0);
  64         assert(Limit > 0);
  65         assert(Name != NULL);
  66
  67         if (Count < Limit)
  68                 return false;
  69
  70         (void)IRC_WriteStrClient(From,
  71                                  "NOTICE %s :%s list limit (%d) reached!",
  72                                  Client_ID(From), Name, Limit);
  73         IRC_SetPenalty(From, 2);
  74         return true;
  75 }
  76
  77
  78 GLOBAL bool
  79 IRC_ERROR( CLIENT *Client, REQUEST *Req )
  80 {
  81         assert( Client != NULL );
  82         assert( Req != NULL );
  83
  84         if (Client_Type(Client) != CLIENT_GOTPASS
  85             && Client_Type(Client) != CLIENT_GOTPASS_2813
  86             && Client_Type(Client) != CLIENT_UNKNOWNSERVER
  87             && Client_Type(Client) != CLIENT_SERVER
  88             && Client_Type(Client) != CLIENT_SERVICE) {
  89                 LogDebug("Ignored ERROR command from \"%s\" ...",
  90                          Client_Mask(Client));
  91                 IRC_SetPenalty(Client, 2);
  92                 return CONNECTED;
  93         }
  94
  95         if (Req->argc < 1)
  96                 Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
  97                     Client_Mask(Client));
  98         else
  99                 Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
 100                     Client_Mask(Client), Req->argv[0]);
 101
 102         return CONNECTED;
 103 } /* IRC_ERROR */
 104
 105
 106 /**
 107  * Handler for the IRC "KILL" command.
 108  *
 109  * This function implements the IRC command "KILL" wich is used to selectively
 110  * disconnect clients. It can be used by IRC operators and servers, for example
 111  * to "solve" nick collisions after netsplits. See RFC 2812 section 3.7.1.
 112  *
 113  * Please note that this function is also called internally, without a real
 114  * KILL command being received over the network! Client is Client_ThisServer()
 115  * in this case, and the prefix in Req is NULL.
 116  *
 117  * @param Client        The client from which this command has been received
 118  *                      or Client_ThisServer() when generated interanlly.
 119  * @param Req           Request structure with prefix and all parameters.
 120  * @returns             CONNECTED or DISCONNECTED.
 121  */
 122 GLOBAL bool
 123 IRC_KILL( CLIENT *Client, REQUEST *Req )
 124 {
 125         CLIENT *prefix, *c;
 126         char reason[COMMAND_LEN], *msg;
 127         CONN_ID my_conn, conn;
 128
 129         assert (Client != NULL);
 130         assert (Req != NULL);
 131
 132         if (Client_Type(Client) != CLIENT_SERVER && !Client_OperByMe(Client))
 133                 return IRC_WriteStrClient(Client, ERR_NOPRIVILEGES_MSG,
 134                                           Client_ID(Client));
 135
 136         if (Req->argc != 2)
 137                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 138                                           Client_ID(Client), Req->command);
 139
 140         /* Get prefix (origin); use the client if no prefix is given. */
 141         if (Req->prefix)
 142                 prefix = Client_Search(Req->prefix);
 143         else
 144                 prefix = Client;
 145
 146         /* Log a warning message and use this server as origin when the
 147          * prefix (origin) is invalid. */
 148         if (!prefix) {
 149                 Log(LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
 150                     Req->prefix );
 151                 prefix = Client_ThisServer();
 152         }
 153
 154         if (Client != Client_ThisServer())
 155                 Log(LOG_NOTICE|LOG_snotice,
 156                     "Got KILL command from \"%s\" for \"%s\": %s",
 157                     Client_Mask(prefix), Req->argv[0], Req->argv[1]);
 158
 159         /* Build reason string: Prefix the "reason" if the originator is a
 160          * regular user, so users can't spoof KILLs of servers. */
 161         if (Client_Type(Client) == CLIENT_USER)
 162                 snprintf(reason, sizeof(reason), "KILLed by %s: %s",
 163                          Client_ID(Client), Req->argv[1]);
 164         else
 165                 strlcpy(reason, Req->argv[1], sizeof(reason));
 166
 167         /* Inform other servers */
 168         IRC_WriteStrServersPrefix(Client, prefix, "KILL %s :%s",
 169                                   Req->argv[0], reason);
 170
 171         /* Save ID of this connection */
 172         my_conn = Client_Conn( Client );
 173
 174         /* Do we host such a client? */
 175         c = Client_Search( Req->argv[0] );
 176         if( c )
 177         {
 178                 if(( Client_Type( c ) != CLIENT_USER ) &&
 179                    ( Client_Type( c ) != CLIENT_GOTNICK ))
 180                 {
 181                         /* Target of this KILL is not a regular user, this is
 182                          * invalid! So we ignore this case if we received a
 183                          * regular KILL from the network and try to kill the
 184                          * client/connection anyway (but log an error!) if the
 185                          * origin is the local server. */
 186
 187                         if( Client != Client_ThisServer( ))
 188                         {
 189                                 /* Invalid KILL received from remote */
 190                                 if( Client_Type( c ) == CLIENT_SERVER )
 191                                         msg = ERR_CANTKILLSERVER_MSG;
 192                                 else
 193                                         msg = ERR_NOPRIVILEGES_MSG;
 194                                 return IRC_WriteStrClient( Client, msg,
 195                                         Client_ID( Client ));
 196                         }
 197
 198                         Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
 199                              Client_Type( c ), Req->argv[0] );
 200                 }
 201
 202                 /* Kill the client NOW:
 203                  *  - Close the local connection (if there is one),
 204                  *  - Destroy the CLIENT structure for remote clients.
 205                  * Note: Conn_Close() removes the CLIENT structure as well. */
 206                 conn = Client_Conn( c );
 207                 if(conn > NONE)
 208                         Conn_Close(conn, NULL, reason, true);
 209                 else
 210                         Client_Destroy(c, NULL, reason, false);
 211         }
 212         else
 213                 Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
 214
 215         /* Are we still connected or were we killed, too? */
 216         if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
 217                 return CONNECTED;
 218         else
 219                 return DISCONNECTED;
 220 } /* IRC_KILL */
 221
 222
 223 /**
 224  * Handler for the IRC command NOTICE.
 225  */
 226 GLOBAL bool
 227 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 228 {
 229         return Send_Message(Client, Req, CLIENT_USER, false);
 230 } /* IRC_NOTICE */
 231
 232
 233 /**
 234  * Handler for the IRC command PRIVMSG.
 235  */
 236 GLOBAL bool
 237 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 238 {
 239         return Send_Message(Client, Req, CLIENT_USER, true);
 240 } /* IRC_PRIVMSG */
 241
 242
 243 /**
 244  * Handler for the IRC command SQUERY.
 245  */
 246 GLOBAL bool
 247 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 248 {
 249         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 250 } /* IRC_SQUERY */
 251
 252
 253 GLOBAL bool
 254 IRC_TRACE( CLIENT *Client, REQUEST *Req )
 255 {
 256         CLIENT *from, *target, *c;
 257         CONN_ID idx, idx2;
 258         char user[CLIENT_USER_LEN];
 259
 260         assert( Client != NULL );
 261         assert( Req != NULL );
 262
 263         /* Bad number of arguments? */
 264         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 265
 266         /* Search sender */
 267         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 268         else from = Client;
 269         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 270
 271         /* Search target */
 272         if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
 273         else target = Client_ThisServer( );
 274
 275         /* Forward command to other server? */
 276         if( target != Client_ThisServer( ))
 277         {
 278                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
 279
 280                 /* Send RPL_TRACELINK back to initiator */
 281                 idx = Client_Conn( Client ); assert( idx > NONE );
 282                 idx2 = Client_Conn( Client_NextHop( target )); assert( idx2 > NONE );
 283                 if( ! IRC_WriteStrClient( from, RPL_TRACELINK_MSG, Client_ID( from ), PACKAGE_NAME, PACKAGE_VERSION, Client_ID( target ), Client_ID( Client_NextHop( target )), Option_String( idx2 ), time( NULL ) - Conn_StartTime( idx2 ), Conn_SendQ( idx ), Conn_SendQ( idx2 ))) return DISCONNECTED;
 284
 285                 /* Forward command */
 286                 IRC_WriteStrClientPrefix( target, from, "TRACE %s", Req->argv[0] );
 287                 return CONNECTED;
 288         }
 289
 290         /* Infos about all connected servers */
 291         c = Client_First( );
 292         while( c )
 293         {
 294                 if( Client_Conn( c ) > NONE )
 295                 {
 296                         /* Local client */
 297                         if( Client_Type( c ) == CLIENT_SERVER )
 298                         {
 299                                 /* Server link */
 300                                 strlcpy( user, Client_User( c ), sizeof( user ));
 301                                 if( user[0] == '~' ) strlcpy( user, "unknown", sizeof( user ));
 302                                 if( ! IRC_WriteStrClient( from, RPL_TRACESERVER_MSG, Client_ID( from ), Client_ID( c ), user, Client_Hostname( c ), Client_Mask( Client_ThisServer( )), Option_String( Client_Conn( c )))) return DISCONNECTED;
 303                         }
 304                         if(( Client_Type( c ) == CLIENT_USER ) && ( strchr( Client_Modes( c ), 'o' )))
 305                         {
 306                                 /* IRC Operator */
 307                                 if( ! IRC_WriteStrClient( from, RPL_TRACEOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
 308                         }
 309                 }
 310                 c = Client_Next( c );
 311         }
 312
 313         IRC_SetPenalty( Client, 3 );
 314         return IRC_WriteStrClient( from, RPL_TRACEEND_MSG, Client_ID( from ), Conf_ServerName, PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_DebugLevel );
 315 } /* IRC_TRACE */
 316
 317
 318 GLOBAL bool
 319 IRC_HELP( CLIENT *Client, REQUEST *Req )
 320 {
 321         COMMAND *cmd;
 322
 323         assert( Client != NULL );
 324         assert( Req != NULL );
 325
 326         /* Bad number of arguments? */
 327         if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 328
 329         cmd = Parse_GetCommandStruct( );
 330         while( cmd->name )
 331         {
 332                 if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
 333                 cmd++;
 334         }
 335
 336         IRC_SetPenalty( Client, 2 );
 337         return CONNECTED;
 338 } /* IRC_HELP */
 339
 340
 341 static char *
 342 #ifdef ZLIB
 343 Option_String(CONN_ID Idx)
 344 #else
 345 Option_String(UNUSED CONN_ID Idx)
 346 #endif
 347 {
 348         static char option_txt[8];
 349 #ifdef ZLIB
 350         UINT16 options;
 351
 352         options = Conn_Options(Idx);
 353 #endif
 354
 355         strcpy(option_txt, "F");        /* No idea what this means, but the
 356                                          * original ircd sends it ... */
 357 #ifdef ZLIB
 358         if(options & CONN_ZIP)          /* zlib compression supported. */
 359                 strcat(option_txt, "z");
 360 #endif
 361
 362         return option_txt;
 363 } /* Option_String */
 364
 365
 366 static bool
 367 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 368 {
 369         CLIENT *cl, *from;
 370         CL2CHAN *cl2chan;
 371         CHANNEL *chan;
 372         char *currentTarget = Req->argv[0];
 373         char *lastCurrentTarget = NULL;
 374         char *message = NULL;
 375
 376         assert(Client != NULL);
 377         assert(Req != NULL);
 378
 379         if (Req->argc == 0) {
 380                 if (!SendErrors)
 381                         return CONNECTED;
 382                 return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
 383                                           Client_ID(Client), Req->command);
 384         }
 385         if (Req->argc == 1) {
 386                 if (!SendErrors)
 387                         return CONNECTED;
 388                 return IRC_WriteStrClient(Client, ERR_NOTEXTTOSEND_MSG,
 389                                           Client_ID(Client));
 390         }
 391         if (Req->argc > 2) {
 392                 if (!SendErrors)
 393                         return CONNECTED;
 394                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 395                                           Client_ID(Client), Req->command);
 396         }
 397
 398         if (Client_Type(Client) == CLIENT_SERVER)
 399                 from = Client_Search(Req->prefix);
 400         else
 401                 from = Client;
 402         if (!from)
 403                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 404                                           Client_ID(Client), Req->prefix);
 405
 406 #ifdef ICONV
 407         if (Client_Conn(Client) > NONE)
 408                 message = Conn_EncodingFrom(Client_Conn(Client), Req->argv[1]);
 409         else
 410 #endif
 411                 message = Req->argv[1];
 412
 413         /* handle msgtarget = msgto *("," msgto) */
 414         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 415         ngt_UpperStr(Req->command);
 416
 417         while (currentTarget) {
 418                 /* Check for and handle valid <msgto> of form:
 419                  * RFC 2812 2.3.1:
 420                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 421                  *   msgto =/ ( user "%" host ) / targetmask
 422                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 423                  */
 424                 if (strchr(currentTarget, '!') == NULL)
 425                         /* nickname */
 426                         cl = Client_Search(currentTarget);
 427                 else
 428                         cl = NULL;
 429
 430                 if (cl == NULL) {
 431                         /* If currentTarget isn't a nickname check for:
 432                          * user ["%" host] "@" servername
 433                          * user "%" host
 434                          * nickname "!" user "@" host
 435                          */
 436                         char target[COMMAND_LEN];
 437                         char * nick = NULL;
 438                         char * user = NULL;
 439                         char * host = NULL;
 440                         char * server = NULL;
 441
 442                         strlcpy(target, currentTarget, COMMAND_LEN);
 443                         server = strchr(target, '@');
 444                         if (server) {
 445                                 *server = '\0';
 446                                 server++;
 447                         }
 448                         host = strchr(target, '%');
 449                         if (host) {
 450                                 *host = '\0';
 451                                 host++;
 452                         }
 453                         user = strchr(target, '!');
 454                         if (user) {
 455                                 /* msgto form: nick!user@host */
 456                                 *user = '\0';
 457                                 user++;
 458                                 nick = target;
 459                                 host = server; /* not "@server" but "@host" */
 460                         } else {
 461                                 user = target;
 462                         }
 463
 464                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 465                                 if (Client_Type(cl) != CLIENT_USER &&
 466                                     Client_Type(cl) != CLIENT_SERVICE)
 467                                         continue;
 468                                 if (nick != NULL && host != NULL) {
 469                                         if (strcasecmp(nick, Client_ID(cl)) == 0 &&
 470                                             strcasecmp(user, Client_User(cl)) == 0 &&
 471                                             strcasecmp(host, Client_HostnameDisplayed(cl)) == 0)
 472                                                 break;
 473                                         else
 474                                                 continue;
 475                                 }
 476                                 if (strcasecmp(user, Client_User(cl)) != 0)
 477                                         continue;
 478                                 if (host != NULL && strcasecmp(host,
 479                                                 Client_HostnameDisplayed(cl)) != 0)
 480                                         continue;
 481                                 if (server != NULL && strcasecmp(server,
 482                                                 Client_ID(Client_Introducer(cl))) != 0)
 483                                         continue;
 484                                 break;
 485                         }
 486                 }
 487
 488                 if (cl) {
 489                         /* Target is a user, enforce type */
 490 #ifndef STRICT_RFC
 491                         if (Client_Type(cl) != ForceType &&
 492                             !(ForceType == CLIENT_USER &&
 493                               (Client_Type(cl) == CLIENT_USER ||
 494                                Client_Type(cl) == CLIENT_SERVICE))) {
 495 #else
 496                         if (Client_Type(cl) != ForceType) {
 497 #endif
 498                                 if (SendErrors && !IRC_WriteStrClient(
 499                                     from, ERR_NOSUCHNICK_MSG,Client_ID(from),
 500                                     currentTarget))
 501                                         return DISCONNECTED;
 502                                 goto send_next_target;
 503                         }
 504
 505 #ifndef STRICT_RFC
 506                         if (ForceType == CLIENT_SERVICE &&
 507                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 508                              & CONN_RFC1459)) {
 509                                 /* SQUERY command but RFC 1459 link: convert
 510                                  * request to PRIVMSG command */
 511                                 Req->command = "PRIVMSG";
 512                         }
 513 #endif
 514                         if (Client_HasMode(cl, 'b') &&
 515                             !Client_HasMode(from, 'R') &&
 516                             !Client_HasMode(from, 'o') &&
 517                             !(Client_Type(from) == CLIENT_SERVER) &&
 518                             !(Client_Type(from) == CLIENT_SERVICE)) {
 519                                 if (SendErrors && !IRC_WriteStrClient(from,
 520                                                 ERR_NONONREG_MSG,
 521                                                 Client_ID(from), Client_ID(cl)))
 522                                         return DISCONNECTED;
 523                                 goto send_next_target;
 524                         }
 525
 526                         if (Client_HasMode(cl, 'C')) {
 527                                 cl2chan = Channel_FirstChannelOf(cl);
 528                                 while (cl2chan) {
 529                                         chan = Channel_GetChannel(cl2chan);
 530                                         if (Channel_IsMemberOf(chan, from))
 531                                                 break;
 532                                         cl2chan = Channel_NextChannelOf(cl, cl2chan);
 533                                 }
 534                                 if (!cl2chan) {
 535                                         if (SendErrors && !IRC_WriteStrClient(
 536                                             from, ERR_NOTONSAMECHANNEL_MSG,
 537                                             Client_ID(from), Client_ID(cl)))
 538                                                 return DISCONNECTED;
 539                                         goto send_next_target;
 540                                 }
 541                         }
 542
 543                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 544                             && strchr(Client_Modes(cl), 'a')) {
 545                                 /* Target is away */
 546                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 547                                                         Client_ID(from),
 548                                                         Client_ID(cl),
 549                                                         Client_Away(cl)))
 550                                         return DISCONNECTED;
 551                         }
 552                         if (Client_Conn(from) > NONE) {
 553                                 Conn_UpdateIdle(Client_Conn(from));
 554                         }
 555                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 556                                                       Req->command, Client_ID(cl),
 557                                                       message))
 558                                 return DISCONNECTED;
 559                 } else if (ForceType != CLIENT_SERVICE
 560                            && (chan = Channel_Search(currentTarget))) {
 561                         if (!Channel_Write(chan, from, Client, Req->command,
 562                                            SendErrors, message))
 563                                         return DISCONNECTED;
 564                 } else if (ForceType != CLIENT_SERVICE
 565                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 566                            && strchr("$#", currentTarget[0])
 567                            && strchr(currentTarget, '.')) {
 568                         /* targetmask */
 569                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 570                                                message, SendErrors))
 571                                 return DISCONNECTED;
 572                 } else {
 573                         if (!SendErrors)
 574                                 return CONNECTED;
 575                         if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 576                                                 Client_ID(from), currentTarget))
 577                                 return DISCONNECTED;
 578                 }
 579
 580         send_next_target:
 581                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 582                 if (currentTarget)
 583                         Conn_SetPenalty(Client_Conn(Client), 1);
 584         }
 585
 586         return CONNECTED;
 587 } /* Send_Message */
 588
 589
 590 static bool
 591 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 592                   char * message, bool SendErrors)
 593 {
 594         CLIENT *cl;
 595         bool client_match;
 596         char *mask = targetMask + 1;
 597         const char *check_wildcards;
 598
 599         cl = NULL;
 600
 601         if (strchr(Client_Modes(from), 'o') == NULL) {
 602                 if (!SendErrors)
 603                         return true;
 604                 return IRC_WriteStrClient(from, ERR_NOPRIVILEGES_MSG,
 605                                           Client_ID(from));
 606         }
 607
 608         /*
 609          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 610          * dot (".") and no wildcards ("*", "?") following the last one.
 611          */
 612         check_wildcards = strrchr(targetMask, '.');
 613         assert(check_wildcards != NULL);
 614         if (check_wildcards &&
 615                 check_wildcards[strcspn(check_wildcards, "*?")])
 616         {
 617                 if (!SendErrors)
 618                         return true;
 619                 return IRC_WriteStrClient(from, ERR_WILDTOPLEVEL, targetMask);
 620         }
 621
 622         /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 623         if (targetMask[0] == '#') {
 624                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 625                         if (Client_Type(cl) != CLIENT_USER)
 626                                 continue;
 627                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 628                         if (client_match)
 629                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 630                                                 command, Client_ID(cl), message))
 631                                         return false;
 632                 }
 633         } else {
 634                 assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
 635                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 636                         if (Client_Type(cl) != CLIENT_USER)
 637                                 continue;
 638                         client_match = MatchCaseInsensitive(mask,
 639                                         Client_ID(Client_Introducer(cl)));
 640                         if (client_match)
 641                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 642                                                 command, Client_ID(cl), message))
 643                                         return false;
 644                 }
 645         }
 646         return CONNECTED;
 647 } /* Send_Message_Mask */
 648
 649
 650 /* -eof- */