src/ngircd/irc.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2013 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-macros.h"
  31 #include "irc-write.h"
  32 #include "log.h"
  33 #include "match.h"
  34 #include "messages.h"
  35 #include "parse.h"
  36 #include "op.h"
  37 #include "tool.h"
  38
  39 #include "exp.h"
  40 #include "irc.h"
  41
  42 static char *Option_String PARAMS((CONN_ID Idx));
  43 static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType,
  44                                  bool SendErrors));
  45 static bool Send_Message_Mask PARAMS((CLIENT *from, char *command,
  46                                       char *targetMask, char *message,
  47                                       bool SendErrors));
  48 static bool Help PARAMS((CLIENT *Client, const char *Topic));
  49
  50 /**
  51  * Check if a list limit is reached and inform client accordingly.
  52  *
  53  * @param From The client.
  54  * @param Count Reply item count.
  55  * @param Limit Reply limit.
  56  * @param Name Name of the list.
  57  * @return true if list limit has been reached; false otherwise.
  58  */
  59 GLOBAL bool
  60 IRC_CheckListTooBig(CLIENT *From, const int Count, const int Limit,
  61                     const char *Name)
  62 {
  63         assert(From != NULL);
  64         assert(Count >= 0);
  65         assert(Limit > 0);
  66         assert(Name != NULL);
  67
  68         if (Count < Limit)
  69                 return false;
  70
  71         (void)IRC_WriteStrClient(From,
  72                                  "NOTICE %s :%s list limit (%d) reached!",
  73                                  Client_ID(From), Name, Limit);
  74         IRC_SetPenalty(From, 2);
  75         return true;
  76 }
  77
  78 /**
  79  * Handler for the IRC "ERROR" command.
  80  *
  81  * @param Client The client from which this command has been received.
  82  * @param Req Request structure with prefix and all parameters.
  83  * @return CONNECTED or DISCONNECTED.
  84 */
  85 GLOBAL bool
  86 IRC_ERROR(CLIENT *Client, REQUEST *Req)
  87 {
  88         assert( Client != NULL );
  89         assert( Req != NULL );
  90
  91         if (Client_Type(Client) != CLIENT_GOTPASS
  92             && Client_Type(Client) != CLIENT_GOTPASS_2813
  93             && Client_Type(Client) != CLIENT_UNKNOWNSERVER
  94             && Client_Type(Client) != CLIENT_SERVER
  95             && Client_Type(Client) != CLIENT_SERVICE) {
  96                 LogDebug("Ignored ERROR command from \"%s\" ...",
  97                          Client_Mask(Client));
  98                 IRC_SetPenalty(Client, 2);
  99                 return CONNECTED;
 100         }
 101
 102         if (Req->argc < 1)
 103                 Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
 104                     Client_Mask(Client));
 105         else
 106                 Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
 107                     Client_Mask(Client), Req->argv[0]);
 108
 109         return CONNECTED;
 110 } /* IRC_ERROR */
 111
 112 /**
 113  * Handler for the IRC "KILL" command.
 114  *
 115  * This function implements the IRC command "KILL" which is used to selectively
 116  * disconnect clients. It can be used by IRC operators and servers, for example
 117  * to "solve" nick collisions after netsplits. See RFC 2812 section 3.7.1.
 118  *
 119  * Please note that this function is also called internally, without a real
 120  * KILL command being received over the network! Client is Client_ThisServer()
 121  * in this case, and the prefix in Req is NULL.
 122  *
 123  * @param Client The client from which this command has been received or
 124  * Client_ThisServer() when generated interanlly.
 125  * @param Req Request structure with prefix and all parameters.
 126  * @return CONNECTED or DISCONNECTED.
 127  */
 128 GLOBAL bool
 129 IRC_KILL(CLIENT *Client, REQUEST *Req)
 130 {
 131         CLIENT *prefix, *c;
 132         char reason[COMMAND_LEN], *msg;
 133         CONN_ID my_conn, conn;
 134
 135         assert (Client != NULL);
 136         assert (Req != NULL);
 137
 138         if (Client_Type(Client) != CLIENT_SERVER && !Op_Check(Client, Req))
 139                 return Op_NoPrivileges(Client, Req);
 140
 141         /* Get prefix (origin); use the client if no prefix is given. */
 142         if (Req->prefix)
 143                 prefix = Client_Search(Req->prefix);
 144         else
 145                 prefix = Client;
 146
 147         /* Log a warning message and use this server as origin when the
 148          * prefix (origin) is invalid. And this is the reason why we don't
 149          * use the _IRC_GET_SENDER_OR_RETURN_ macro above! */
 150         if (!prefix) {
 151                 Log(LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
 152                     Req->prefix );
 153                 prefix = Client_ThisServer();
 154         }
 155
 156         if (Client != Client_ThisServer())
 157                 Log(LOG_NOTICE|LOG_snotice,
 158                     "Got KILL command from \"%s\" for \"%s\": \"%s\".",
 159                     Client_Mask(prefix), Req->argv[0], Req->argv[1]);
 160
 161         /* Build reason string: Prefix the "reason" if the originator is a
 162          * regular user, so users can't spoof KILLs of servers. */
 163         if (Client_Type(Client) == CLIENT_USER)
 164                 snprintf(reason, sizeof(reason), "KILLed by %s: %s",
 165                          Client_ID(Client), Req->argv[1]);
 166         else
 167                 strlcpy(reason, Req->argv[1], sizeof(reason));
 168
 169         /* Inform other servers */
 170         IRC_WriteStrServersPrefix(Client, prefix, "KILL %s :%s",
 171                                   Req->argv[0], reason);
 172
 173         /* Save ID of this connection */
 174         my_conn = Client_Conn( Client );
 175
 176         /* Do we host such a client? */
 177         c = Client_Search( Req->argv[0] );
 178         if (c) {
 179                 if (Client_Type(c) != CLIENT_USER
 180                     && Client_Type(c) != CLIENT_GOTNICK) {
 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                                 /* Invalid KILL received from remote */
 189                                 if (Client_Type(c) == CLIENT_SERVER)
 190                                         msg = ERR_CANTKILLSERVER_MSG;
 191                                 else
 192                                         msg = ERR_NOPRIVILEGES_MSG;
 193                                 return IRC_WriteErrClient(Client, msg,
 194                                                           Client_ID(Client));
 195                         }
 196
 197                         Log(LOG_ERR,
 198                             "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.",
 214                     Req->argv[0]);
 215
 216         /* Are we still connected or were we killed, too? */
 217         if (my_conn > NONE && Conn_GetClient(my_conn))
 218                 return CONNECTED;
 219         else
 220                 return DISCONNECTED;
 221 } /* IRC_KILL */
 222
 223 /**
 224  * Handler for the IRC "NOTICE" command.
 225  *
 226  * @param Client The client from which this command has been received.
 227  * @param Req Request structure with prefix and all parameters.
 228  * @return CONNECTED or DISCONNECTED.
 229 */
 230 GLOBAL bool
 231 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 232 {
 233         return Send_Message(Client, Req, CLIENT_USER, false);
 234 } /* IRC_NOTICE */
 235
 236 /**
 237  * Handler for the IRC "PRIVMSG" command.
 238  *
 239  * @param Client The client from which this command has been received.
 240  * @param Req Request structure with prefix and all parameters.
 241  * @return CONNECTED or DISCONNECTED.
 242  */
 243 GLOBAL bool
 244 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 245 {
 246         return Send_Message(Client, Req, CLIENT_USER, true);
 247 } /* IRC_PRIVMSG */
 248
 249 /**
 250  * Handler for the IRC "SQUERY" command.
 251  *
 252  * @param Client The client from which this command has been received.
 253  * @param Req Request structure with prefix and all parameters.
 254  * @return CONNECTED or DISCONNECTED.
 255  */
 256 GLOBAL bool
 257 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 258 {
 259         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 260 } /* IRC_SQUERY */
 261
 262 /*
 263  * Handler for the IRC "TRACE" command.
 264  *
 265  * @param Client The client from which this command has been received.
 266  * @param Req Request structure with prefix and all parameters.
 267  * @return CONNECTED or DISCONNECTED.
 268  */
 269  GLOBAL bool
 270 IRC_TRACE(CLIENT *Client, REQUEST *Req)
 271 {
 272         CLIENT *from, *target, *c;
 273         CONN_ID idx, idx2;
 274         char user[CLIENT_USER_LEN];
 275
 276         assert(Client != NULL);
 277         assert(Req != NULL);
 278
 279         IRC_SetPenalty(Client, 3);
 280
 281         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 282         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
 283
 284         /* Forward command to other server? */
 285         if (target != Client_ThisServer()) {
 286                 /* Send RPL_TRACELINK back to initiator */
 287                 idx = Client_Conn(Client);
 288                 assert(idx > NONE);
 289                 idx2 = Client_Conn(Client_NextHop(target));
 290                 assert(idx2 > NONE);
 291
 292                 if (!IRC_WriteStrClient(from, RPL_TRACELINK_MSG,
 293                                         Client_ID(from), PACKAGE_NAME,
 294                                         PACKAGE_VERSION, Client_ID(target),
 295                                         Client_ID(Client_NextHop(target)),
 296                                         Option_String(idx2),
 297                                         time(NULL) - Conn_StartTime(idx2),
 298                                         Conn_SendQ(idx), Conn_SendQ(idx2)))
 299                         return DISCONNECTED;
 300
 301                 /* Forward command */
 302                 IRC_WriteStrClientPrefix(target, from, "TRACE %s", Req->argv[0]);
 303                 return CONNECTED;
 304         }
 305
 306         /* Infos about all connected servers */
 307         c = Client_First();
 308         while (c) {
 309                 if (Client_Conn(c) > NONE) {
 310                         /* Local client */
 311                         if (Client_Type(c) == CLIENT_SERVER) {
 312                                 /* Server link */
 313                                 strlcpy(user, Client_User(c), sizeof(user));
 314                                 if (user[0] == '~')
 315                                         strlcpy(user, "unknown", sizeof(user));
 316                                 if (!IRC_WriteStrClient(from,
 317                                                 RPL_TRACESERVER_MSG,
 318                                                 Client_ID(from), Client_ID(c),
 319                                                 user, Client_Hostname(c),
 320                                                 Client_Mask(Client_ThisServer()),
 321                                                 Option_String(Client_Conn(c))))
 322                                         return DISCONNECTED;
 323                         }
 324                         if (Client_Type(c) == CLIENT_USER
 325                             && Client_HasMode(c, 'o')) {
 326                                 /* IRC Operator */
 327                                 if (!IRC_WriteStrClient(from,
 328                                                 RPL_TRACEOPERATOR_MSG,
 329                                                 Client_ID(from), Client_ID(c)))
 330                                         return DISCONNECTED;
 331                         }
 332                 }
 333                 c = Client_Next( c );
 334         }
 335
 336         return IRC_WriteStrClient(from, RPL_TRACEEND_MSG, Client_ID(from),
 337                                   Conf_ServerName, PACKAGE_NAME,
 338                                   PACKAGE_VERSION, NGIRCd_DebugLevel);
 339 } /* IRC_TRACE */
 340
 341 /**
 342  * Handler for the IRC "HELP" command.
 343  *
 344  * @param Client The client from which this command has been received.
 345  * @param Req Request structure with prefix and all parameters.
 346  * @return CONNECTED or DISCONNECTED.
 347  */
 348 GLOBAL bool
 349 IRC_HELP(CLIENT *Client, REQUEST *Req)
 350 {
 351         COMMAND *cmd;
 352
 353         assert(Client != NULL);
 354         assert(Req != NULL);
 355
 356         IRC_SetPenalty(Client, 2);
 357
 358         if ((Req->argc == 0 && array_bytes(&Conf_Helptext) > 0)
 359             || (Req->argc >= 1 && strcasecmp(Req->argv[0], "Commands") != 0)) {
 360                 /* Help text available and requested */
 361                 if (Req->argc >= 1)
 362                         return Help(Client, Req->argv[0]);
 363
 364                 if (!Help(Client, "Intro"))
 365                         return DISCONNECTED;
 366                 return CONNECTED;
 367         }
 368
 369         cmd = Parse_GetCommandStruct();
 370         while(cmd->name) {
 371                 if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 372                                         Client_ID(Client), cmd->name))
 373                         return DISCONNECTED;
 374                 cmd++;
 375         }
 376         return CONNECTED;
 377 } /* IRC_HELP */
 378
 379 /**
 380  * Send help for a given topic to the client.
 381  *
 382  * @param Client The client requesting help.
 383  * @param Topoc The help topic requested.
 384  * @return CONNECTED or DISCONNECTED.
 385  */
 386 static bool
 387 Help(CLIENT *Client, const char *Topic)
 388 {
 389         char *line;
 390         size_t helptext_len, len_str, idx_start, lines = 0;
 391         bool in_article = false;
 392
 393         assert(Client != NULL);
 394         assert(Topic != NULL);
 395
 396         helptext_len = array_bytes(&Conf_Helptext);
 397         line = array_start(&Conf_Helptext);
 398         while (helptext_len > 0) {
 399                 len_str = strlen(line) + 1;
 400                 assert(helptext_len >= len_str);
 401                 helptext_len -= len_str;
 402
 403                 if (in_article) {
 404                         /* The first character in each article text line must
 405                          * be a TAB (ASCII 9) character which will be stripped
 406                          * in the output. If it is not a TAB, the end of the
 407                          * article has been reached. */
 408                         if (line[0] != '\t') {
 409                                 if (lines > 0)
 410                                         return CONNECTED;
 411                                 else
 412                                         break;
 413                         }
 414
 415                         /* A single '.' character indicates an empty line */
 416                         if (line[1] == '.' && line[2] == '\0')
 417                                 idx_start = 2;
 418                         else
 419                                 idx_start = 1;
 420
 421                         if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 422                                                 Client_ID(Client),
 423                                                 &line[idx_start]))
 424                                 return DISCONNECTED;
 425                         lines++;
 426
 427                 } else {
 428                         if (line[0] == '-' && line[1] == ' '
 429                             && strcasecmp(&line[2], Topic) == 0)
 430                                 in_article = true;
 431                 }
 432
 433                 line += len_str;
 434         }
 435
 436         /* Help topic not found (or empty)! */
 437         if (!IRC_WriteStrClient(Client, "NOTICE %s :No help for \"%s\" found!",
 438                                 Client_ID(Client), Topic))
 439                 return DISCONNECTED;
 440
 441         return CONNECTED;
 442 }
 443
 444 /**
 445  * Get pointer to a static string representing the connection "options".
 446  *
 447  * @param Idx Connection index.
 448  * @return Pointer to static (global) string buffer.
 449  */
 450 static char *
 451 #ifdef ZLIB
 452 Option_String(CONN_ID Idx)
 453 #else
 454 Option_String(UNUSED CONN_ID Idx)
 455 #endif
 456 {
 457         static char option_txt[8];
 458 #ifdef ZLIB
 459         UINT16 options;
 460 #endif
 461
 462         assert(Idx != NONE);
 463
 464         options = Conn_Options(Idx);
 465         strcpy(option_txt, "F");        /* No idea what this means, but the
 466                                          * original ircd sends it ... */
 467 #ifdef SSL_SUPPORT
 468         if(options & CONN_SSL)          /* SSL encrypted link */
 469                 strlcat(option_txt, "s", sizeof(option_txt));
 470 #endif
 471 #ifdef ZLIB
 472         if(options & CONN_ZIP)          /* zlib compression enabled */
 473                 strlcat(option_txt, "z", sizeof(option_txt));
 474 #endif
 475         LogDebug(" *** %d: %d = %s", Idx, options, option_txt);
 476
 477         return option_txt;
 478 } /* Option_String */
 479
 480 static bool
 481 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 482 {
 483         CLIENT *cl, *from;
 484         CL2CHAN *cl2chan;
 485         CHANNEL *chan;
 486         char *currentTarget = Req->argv[0];
 487         char *lastCurrentTarget = NULL;
 488         char *message = NULL;
 489
 490         assert(Client != NULL);
 491         assert(Req != NULL);
 492
 493         if (Req->argc == 0) {
 494                 if (!SendErrors)
 495                         return CONNECTED;
 496                 return IRC_WriteErrClient(Client, ERR_NORECIPIENT_MSG,
 497                                           Client_ID(Client), Req->command);
 498         }
 499         if (Req->argc == 1) {
 500                 if (!SendErrors)
 501                         return CONNECTED;
 502                 return IRC_WriteErrClient(Client, ERR_NOTEXTTOSEND_MSG,
 503                                           Client_ID(Client));
 504         }
 505         if (Req->argc > 2) {
 506                 if (!SendErrors)
 507                         return CONNECTED;
 508                 IRC_SetPenalty(Client, 2);
 509                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 510                                           Client_ID(Client), Req->command);
 511         }
 512
 513         if (Client_Type(Client) == CLIENT_SERVER)
 514                 from = Client_Search(Req->prefix);
 515         else
 516                 from = Client;
 517         if (!from)
 518                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 519                                           Client_ID(Client), Req->prefix);
 520
 521 #ifdef ICONV
 522         if (Client_Conn(Client) > NONE)
 523                 message = Conn_EncodingFrom(Client_Conn(Client), Req->argv[1]);
 524         else
 525 #endif
 526                 message = Req->argv[1];
 527
 528         /* handle msgtarget = msgto *("," msgto) */
 529         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 530         ngt_UpperStr(Req->command);
 531
 532         while (currentTarget) {
 533                 /* Check for and handle valid <msgto> of form:
 534                  * RFC 2812 2.3.1:
 535                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 536                  *   msgto =/ ( user "%" host ) / targetmask
 537                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 538                  */
 539                 if (strchr(currentTarget, '!') == NULL)
 540                         /* nickname */
 541                         cl = Client_Search(currentTarget);
 542                 else
 543                         cl = NULL;
 544
 545                 if (cl == NULL) {
 546                         /* If currentTarget isn't a nickname check for:
 547                          * user ["%" host] "@" servername
 548                          * user "%" host
 549                          * nickname "!" user "@" host
 550                          */
 551                         char target[COMMAND_LEN];
 552                         char * nick = NULL;
 553                         char * user = NULL;
 554                         char * host = NULL;
 555                         char * server = NULL;
 556
 557                         strlcpy(target, currentTarget, COMMAND_LEN);
 558                         server = strchr(target, '@');
 559                         if (server) {
 560                                 *server = '\0';
 561                                 server++;
 562                         }
 563                         host = strchr(target, '%');
 564                         if (host) {
 565                                 *host = '\0';
 566                                 host++;
 567                         }
 568                         user = strchr(target, '!');
 569                         if (user) {
 570                                 /* msgto form: nick!user@host */
 571                                 *user = '\0';
 572                                 user++;
 573                                 nick = target;
 574                                 host = server; /* not "@server" but "@host" */
 575                         } else {
 576                                 user = target;
 577                         }
 578
 579                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 580                                 if (Client_Type(cl) != CLIENT_USER &&
 581                                     Client_Type(cl) != CLIENT_SERVICE)
 582                                         continue;
 583                                 if (nick != NULL && host != NULL) {
 584                                         if (strcasecmp(nick, Client_ID(cl)) == 0 &&
 585                                             strcasecmp(user, Client_User(cl)) == 0 &&
 586                                             strcasecmp(host, Client_HostnameDisplayed(cl)) == 0)
 587                                                 break;
 588                                         else
 589                                                 continue;
 590                                 }
 591                                 if (strcasecmp(user, Client_User(cl)) != 0)
 592                                         continue;
 593                                 if (host != NULL && strcasecmp(host,
 594                                                 Client_HostnameDisplayed(cl)) != 0)
 595                                         continue;
 596                                 if (server != NULL && strcasecmp(server,
 597                                                 Client_ID(Client_Introducer(cl))) != 0)
 598                                         continue;
 599                                 break;
 600                         }
 601                 }
 602
 603                 if (cl) {
 604                         /* Target is a user, enforce type */
 605 #ifndef STRICT_RFC
 606                         if (Client_Type(cl) != ForceType &&
 607                             !(ForceType == CLIENT_USER &&
 608                               (Client_Type(cl) == CLIENT_USER ||
 609                                Client_Type(cl) == CLIENT_SERVICE))) {
 610 #else
 611                         if (Client_Type(cl) != ForceType) {
 612 #endif
 613                                 if (SendErrors && !IRC_WriteErrClient(
 614                                     from, ERR_NOSUCHNICK_MSG,Client_ID(from),
 615                                     currentTarget))
 616                                         return DISCONNECTED;
 617                                 goto send_next_target;
 618                         }
 619
 620 #ifndef STRICT_RFC
 621                         if (ForceType == CLIENT_SERVICE &&
 622                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 623                              & CONN_RFC1459)) {
 624                                 /* SQUERY command but RFC 1459 link: convert
 625                                  * request to PRIVMSG command */
 626                                 Req->command = "PRIVMSG";
 627                         }
 628 #endif
 629                         if (Client_HasMode(cl, 'b') &&
 630                             !Client_HasMode(from, 'R') &&
 631                             !Client_HasMode(from, 'o') &&
 632                             !(Client_Type(from) == CLIENT_SERVER) &&
 633                             !(Client_Type(from) == CLIENT_SERVICE)) {
 634                                 if (SendErrors && !IRC_WriteErrClient(from,
 635                                                 ERR_NONONREG_MSG,
 636                                                 Client_ID(from), Client_ID(cl)))
 637                                         return DISCONNECTED;
 638                                 goto send_next_target;
 639                         }
 640
 641                         if (Client_HasMode(cl, 'C')) {
 642                                 cl2chan = Channel_FirstChannelOf(cl);
 643                                 while (cl2chan) {
 644                                         chan = Channel_GetChannel(cl2chan);
 645                                         if (Channel_IsMemberOf(chan, from))
 646                                                 break;
 647                                         cl2chan = Channel_NextChannelOf(cl, cl2chan);
 648                                 }
 649                                 if (!cl2chan) {
 650                                         if (SendErrors && !IRC_WriteErrClient(
 651                                             from, ERR_NOTONSAMECHANNEL_MSG,
 652                                             Client_ID(from), Client_ID(cl)))
 653                                                 return DISCONNECTED;
 654                                         goto send_next_target;
 655                                 }
 656                         }
 657
 658                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 659                             && Client_HasMode(cl, 'a')) {
 660                                 /* Target is away */
 661                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 662                                                         Client_ID(from),
 663                                                         Client_ID(cl),
 664                                                         Client_Away(cl)))
 665                                         return DISCONNECTED;
 666                         }
 667                         if (Client_Conn(from) > NONE) {
 668                                 Conn_UpdateIdle(Client_Conn(from));
 669                         }
 670                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 671                                                       Req->command, Client_ID(cl),
 672                                                       message))
 673                                 return DISCONNECTED;
 674                 } else if (ForceType != CLIENT_SERVICE
 675                            && (chan = Channel_Search(currentTarget))) {
 676                         if (!Channel_Write(chan, from, Client, Req->command,
 677                                            SendErrors, message))
 678                                         return DISCONNECTED;
 679                 } else if (ForceType != CLIENT_SERVICE
 680                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 681                            && strchr("$#", currentTarget[0])
 682                            && strchr(currentTarget, '.')) {
 683                         /* targetmask */
 684                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 685                                                message, SendErrors))
 686                                 return DISCONNECTED;
 687                 } else {
 688                         if (!SendErrors)
 689                                 return CONNECTED;
 690                         if (!IRC_WriteErrClient(from, ERR_NOSUCHNICK_MSG,
 691                                                 Client_ID(from), currentTarget))
 692                                 return DISCONNECTED;
 693                 }
 694
 695         send_next_target:
 696                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 697                 if (currentTarget)
 698                         Conn_SetPenalty(Client_Conn(Client), 1);
 699         }
 700
 701         return CONNECTED;
 702 } /* Send_Message */
 703
 704 static bool
 705 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 706                   char * message, bool SendErrors)
 707 {
 708         CLIENT *cl;
 709         bool client_match;
 710         char *mask = targetMask + 1;
 711         const char *check_wildcards;
 712
 713         cl = NULL;
 714
 715         if (!Client_HasMode(from, 'o')) {
 716                 if (!SendErrors)
 717                         return true;
 718                 return IRC_WriteErrClient(from, ERR_NOPRIVILEGES_MSG,
 719                                           Client_ID(from));
 720         }
 721
 722         /*
 723          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 724          * dot (".") and no wildcards ("*", "?") following the last one.
 725          */
 726         check_wildcards = strrchr(targetMask, '.');
 727         assert(check_wildcards != NULL);
 728         if (check_wildcards &&
 729                 check_wildcards[strcspn(check_wildcards, "*?")])
 730         {
 731                 if (!SendErrors)
 732                         return true;
 733                 return IRC_WriteErrClient(from, ERR_WILDTOPLEVEL, targetMask);
 734         }
 735
 736         /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 737         if (targetMask[0] == '#') {
 738                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 739                         if (Client_Type(cl) != CLIENT_USER)
 740                                 continue;
 741                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 742                         if (client_match)
 743                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 744                                                 command, Client_ID(cl), message))
 745                                         return false;
 746                 }
 747         } else {
 748                 assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
 749                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 750                         if (Client_Type(cl) != CLIENT_USER)
 751                                 continue;
 752                         client_match = MatchCaseInsensitive(mask,
 753                                         Client_ID(Client_Introducer(cl)));
 754                         if (client_match)
 755                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 756                                                 command, Client_ID(cl), message))
 757                                         return false;
 758                 }
 759         }
 760         return CONNECTED;
 761 } /* Send_Message_Mask */
 762
 763 /* -eof- */