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 "tool.h"
  37
  38 #include "exp.h"
  39 #include "irc.h"
  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 static bool Help PARAMS((CLIENT *Client, const char *Topic));
  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  * Handler for the IRC "ERROR" command.
  79  *
  80  * @param Client The client from which this command has been received.
  81  * @param Req Request structure with prefix and all parameters.
  82  * @return CONNECTED or DISCONNECTED.
  83 */
  84 GLOBAL bool
  85 IRC_ERROR(CLIENT *Client, REQUEST *Req)
  86 {
  87         assert( Client != NULL );
  88         assert( Req != NULL );
  89
  90         if (Client_Type(Client) != CLIENT_GOTPASS
  91             && Client_Type(Client) != CLIENT_GOTPASS_2813
  92             && Client_Type(Client) != CLIENT_UNKNOWNSERVER
  93             && Client_Type(Client) != CLIENT_SERVER
  94             && Client_Type(Client) != CLIENT_SERVICE) {
  95                 LogDebug("Ignored ERROR command from \"%s\" ...",
  96                          Client_Mask(Client));
  97                 IRC_SetPenalty(Client, 2);
  98                 return CONNECTED;
  99         }
 100
 101         if (Req->argc < 1)
 102                 Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
 103                     Client_Mask(Client));
 104         else
 105                 Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
 106                     Client_Mask(Client), Req->argv[0]);
 107
 108         return CONNECTED;
 109 } /* IRC_ERROR */
 110
 111 /**
 112  * Handler for the IRC "KILL" command.
 113  *
 114  * This function implements the IRC command "KILL" which is used to selectively
 115  * disconnect clients. It can be used by IRC operators and servers, for example
 116  * to "solve" nick collisions after netsplits. See RFC 2812 section 3.7.1.
 117  *
 118  * Please note that this function is also called internally, without a real
 119  * KILL command being received over the network! Client is Client_ThisServer()
 120  * in this case, and the prefix in Req is NULL.
 121  *
 122  * @param Client The client from which this command has been received or
 123  * Client_ThisServer() when generated interanlly.
 124  * @param Req Request structure with prefix and all parameters.
 125  * @return CONNECTED or DISCONNECTED.
 126  */
 127 GLOBAL bool
 128 IRC_KILL(CLIENT *Client, REQUEST *Req)
 129 {
 130         CLIENT *prefix, *c;
 131         char reason[COMMAND_LEN], *msg;
 132         CONN_ID my_conn, conn;
 133
 134         assert (Client != NULL);
 135         assert (Req != NULL);
 136
 137         if (Client_Type(Client) != CLIENT_SERVER && !Client_OperByMe(Client))
 138                 return IRC_WriteErrClient(Client, ERR_NOPRIVILEGES_MSG,
 139                                           Client_ID(Client));
 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         /* Bad number of arguments? */
 282         if (Req->argc > 1)
 283                 return IRC_WriteErrClient(Client, ERR_NORECIPIENT_MSG,
 284                                           Client_ID(Client), Req->command);
 285
 286         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 287         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
 288
 289         /* Forward command to other server? */
 290         if (target != Client_ThisServer()) {
 291                 /* Send RPL_TRACELINK back to initiator */
 292                 idx = Client_Conn(Client);
 293                 assert(idx > NONE);
 294                 idx2 = Client_Conn(Client_NextHop(target));
 295                 assert(idx2 > NONE);
 296
 297                 if (!IRC_WriteStrClient(from, RPL_TRACELINK_MSG,
 298                                         Client_ID(from), PACKAGE_NAME,
 299                                         PACKAGE_VERSION, Client_ID(target),
 300                                         Client_ID(Client_NextHop(target)),
 301                                         Option_String(idx2),
 302                                         time(NULL) - Conn_StartTime(idx2),
 303                                         Conn_SendQ(idx), Conn_SendQ(idx2)))
 304                         return DISCONNECTED;
 305
 306                 /* Forward command */
 307                 IRC_WriteStrClientPrefix(target, from, "TRACE %s", Req->argv[0]);
 308                 return CONNECTED;
 309         }
 310
 311         /* Infos about all connected servers */
 312         c = Client_First();
 313         while (c) {
 314                 if (Client_Conn(c) > NONE) {
 315                         /* Local client */
 316                         if (Client_Type(c) == CLIENT_SERVER) {
 317                                 /* Server link */
 318                                 strlcpy(user, Client_User(c), sizeof(user));
 319                                 if (user[0] == '~')
 320                                         strlcpy(user, "unknown", sizeof(user));
 321                                 if (!IRC_WriteStrClient(from,
 322                                                 RPL_TRACESERVER_MSG,
 323                                                 Client_ID(from), Client_ID(c),
 324                                                 user, Client_Hostname(c),
 325                                                 Client_Mask(Client_ThisServer()),
 326                                                 Option_String(Client_Conn(c))))
 327                                         return DISCONNECTED;
 328                         }
 329                         if (Client_Type(c) == CLIENT_USER
 330                             && Client_HasMode(c, 'o')) {
 331                                 /* IRC Operator */
 332                                 if (!IRC_WriteStrClient(from,
 333                                                 RPL_TRACEOPERATOR_MSG,
 334                                                 Client_ID(from), Client_ID(c)))
 335                                         return DISCONNECTED;
 336                         }
 337                 }
 338                 c = Client_Next( c );
 339         }
 340
 341         return IRC_WriteStrClient(from, RPL_TRACEEND_MSG, Client_ID(from),
 342                                   Conf_ServerName, PACKAGE_NAME,
 343                                   PACKAGE_VERSION, NGIRCd_DebugLevel);
 344 } /* IRC_TRACE */
 345
 346 /**
 347  * Handler for the IRC "HELP" command.
 348  *
 349  * @param Client The client from which this command has been received.
 350  * @param Req Request structure with prefix and all parameters.
 351  * @return CONNECTED or DISCONNECTED.
 352  */
 353 GLOBAL bool
 354 IRC_HELP(CLIENT *Client, REQUEST *Req)
 355 {
 356         COMMAND *cmd;
 357
 358         assert(Client != NULL);
 359         assert(Req != NULL);
 360
 361         IRC_SetPenalty(Client, 2);
 362
 363         if ((Req->argc == 0 && array_bytes(&Conf_Helptext) > 0)
 364             || (Req->argc >= 1 && strcasecmp(Req->argv[0], "Commands") != 0)) {
 365                 /* Help text available and requested */
 366                 if (Req->argc >= 1)
 367                         return Help(Client, Req->argv[0]);
 368
 369                 if (!Help(Client, "Intro"))
 370                         return DISCONNECTED;
 371                 return CONNECTED;
 372         }
 373
 374         cmd = Parse_GetCommandStruct();
 375         while(cmd->name) {
 376                 if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 377                                         Client_ID(Client), cmd->name))
 378                         return DISCONNECTED;
 379                 cmd++;
 380         }
 381         return CONNECTED;
 382 } /* IRC_HELP */
 383
 384 /**
 385  * Send help for a given topic to the client.
 386  *
 387  * @param Client The client requesting help.
 388  * @param Topoc The help topic requested.
 389  * @return CONNECTED or DISCONNECTED.
 390  */
 391 static bool
 392 Help(CLIENT *Client, const char *Topic)
 393 {
 394         char *line;
 395         size_t helptext_len, len_str, idx_start, lines = 0;
 396         bool in_article = false;
 397
 398         assert(Client != NULL);
 399         assert(Topic != NULL);
 400
 401         helptext_len = array_bytes(&Conf_Helptext);
 402         line = array_start(&Conf_Helptext);
 403         while (helptext_len > 0) {
 404                 len_str = strlen(line) + 1;
 405                 assert(helptext_len >= len_str);
 406                 helptext_len -= len_str;
 407
 408                 if (in_article) {
 409                         /* The first character in each article text line must
 410                          * be a TAB (ASCII 9) character which will be stripped
 411                          * in the output. If it is not a TAB, the end of the
 412                          * article has been reached. */
 413                         if (line[0] != '\t') {
 414                                 if (lines > 0)
 415                                         return CONNECTED;
 416                                 else
 417                                         break;
 418                         }
 419
 420                         /* A single '.' character indicates an empty line */
 421                         if (line[1] == '.' && line[2] == '\0')
 422                                 idx_start = 2;
 423                         else
 424                                 idx_start = 1;
 425
 426                         if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 427                                                 Client_ID(Client),
 428                                                 &line[idx_start]))
 429                                 return DISCONNECTED;
 430                         lines++;
 431
 432                 } else {
 433                         if (line[0] == '-' && line[1] == ' '
 434                             && strcasecmp(&line[2], Topic) == 0)
 435                                 in_article = true;
 436                 }
 437
 438                 line += len_str;
 439         }
 440
 441         /* Help topic not found (or empty)! */
 442         if (!IRC_WriteStrClient(Client, "NOTICE %s :No help for \"%s\" found!",
 443                                 Client_ID(Client), Topic))
 444                 return DISCONNECTED;
 445
 446         return CONNECTED;
 447 }
 448
 449 /**
 450  * Get pointer to a static string representing the connection "options".
 451  *
 452  * @param Idx Connection index.
 453  * @return Pointer to static (global) string buffer.
 454  */
 455 static char *
 456 #ifdef ZLIB
 457 Option_String(CONN_ID Idx)
 458 #else
 459 Option_String(UNUSED CONN_ID Idx)
 460 #endif
 461 {
 462         static char option_txt[8];
 463 #ifdef ZLIB
 464         UINT16 options;
 465 #endif
 466
 467         assert(Idx != NONE);
 468
 469         options = Conn_Options(Idx);
 470         strcpy(option_txt, "F");        /* No idea what this means, but the
 471                                          * original ircd sends it ... */
 472 #ifdef SSL_SUPPORT
 473         if(options & CONN_SSL)          /* SSL encrypted link */
 474                 strlcat(option_txt, "s", sizeof(option_txt));
 475 #endif
 476 #ifdef ZLIB
 477         if(options & CONN_ZIP)          /* zlib compression enabled */
 478                 strlcat(option_txt, "z", sizeof(option_txt));
 479 #endif
 480         LogDebug(" *** %d: %d = %s", Idx, options, option_txt);
 481
 482         return option_txt;
 483 } /* Option_String */
 484
 485 static bool
 486 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 487 {
 488         CLIENT *cl, *from;
 489         CL2CHAN *cl2chan;
 490         CHANNEL *chan;
 491         char *currentTarget = Req->argv[0];
 492         char *lastCurrentTarget = NULL;
 493         char *message = NULL;
 494
 495         assert(Client != NULL);
 496         assert(Req != NULL);
 497
 498         if (Req->argc == 0) {
 499                 if (!SendErrors)
 500                         return CONNECTED;
 501                 return IRC_WriteErrClient(Client, ERR_NORECIPIENT_MSG,
 502                                           Client_ID(Client), Req->command);
 503         }
 504         if (Req->argc == 1) {
 505                 if (!SendErrors)
 506                         return CONNECTED;
 507                 return IRC_WriteErrClient(Client, ERR_NOTEXTTOSEND_MSG,
 508                                           Client_ID(Client));
 509         }
 510         if (Req->argc > 2) {
 511                 if (!SendErrors)
 512                         return CONNECTED;
 513                 IRC_SetPenalty(Client, 2);
 514                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 515                                           Client_ID(Client), Req->command);
 516         }
 517
 518         if (Client_Type(Client) == CLIENT_SERVER)
 519                 from = Client_Search(Req->prefix);
 520         else
 521                 from = Client;
 522         if (!from)
 523                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 524                                           Client_ID(Client), Req->prefix);
 525
 526 #ifdef ICONV
 527         if (Client_Conn(Client) > NONE)
 528                 message = Conn_EncodingFrom(Client_Conn(Client), Req->argv[1]);
 529         else
 530 #endif
 531                 message = Req->argv[1];
 532
 533         /* handle msgtarget = msgto *("," msgto) */
 534         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 535         ngt_UpperStr(Req->command);
 536
 537         while (currentTarget) {
 538                 /* Check for and handle valid <msgto> of form:
 539                  * RFC 2812 2.3.1:
 540                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 541                  *   msgto =/ ( user "%" host ) / targetmask
 542                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 543                  */
 544                 if (strchr(currentTarget, '!') == NULL)
 545                         /* nickname */
 546                         cl = Client_Search(currentTarget);
 547                 else
 548                         cl = NULL;
 549
 550                 if (cl == NULL) {
 551                         /* If currentTarget isn't a nickname check for:
 552                          * user ["%" host] "@" servername
 553                          * user "%" host
 554                          * nickname "!" user "@" host
 555                          */
 556                         char target[COMMAND_LEN];
 557                         char * nick = NULL;
 558                         char * user = NULL;
 559                         char * host = NULL;
 560                         char * server = NULL;
 561
 562                         strlcpy(target, currentTarget, COMMAND_LEN);
 563                         server = strchr(target, '@');
 564                         if (server) {
 565                                 *server = '\0';
 566                                 server++;
 567                         }
 568                         host = strchr(target, '%');
 569                         if (host) {
 570                                 *host = '\0';
 571                                 host++;
 572                         }
 573                         user = strchr(target, '!');
 574                         if (user) {
 575                                 /* msgto form: nick!user@host */
 576                                 *user = '\0';
 577                                 user++;
 578                                 nick = target;
 579                                 host = server; /* not "@server" but "@host" */
 580                         } else {
 581                                 user = target;
 582                         }
 583
 584                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 585                                 if (Client_Type(cl) != CLIENT_USER &&
 586                                     Client_Type(cl) != CLIENT_SERVICE)
 587                                         continue;
 588                                 if (nick != NULL && host != NULL) {
 589                                         if (strcasecmp(nick, Client_ID(cl)) == 0 &&
 590                                             strcasecmp(user, Client_User(cl)) == 0 &&
 591                                             strcasecmp(host, Client_HostnameDisplayed(cl)) == 0)
 592                                                 break;
 593                                         else
 594                                                 continue;
 595                                 }
 596                                 if (strcasecmp(user, Client_User(cl)) != 0)
 597                                         continue;
 598                                 if (host != NULL && strcasecmp(host,
 599                                                 Client_HostnameDisplayed(cl)) != 0)
 600                                         continue;
 601                                 if (server != NULL && strcasecmp(server,
 602                                                 Client_ID(Client_Introducer(cl))) != 0)
 603                                         continue;
 604                                 break;
 605                         }
 606                 }
 607
 608                 if (cl) {
 609                         /* Target is a user, enforce type */
 610 #ifndef STRICT_RFC
 611                         if (Client_Type(cl) != ForceType &&
 612                             !(ForceType == CLIENT_USER &&
 613                               (Client_Type(cl) == CLIENT_USER ||
 614                                Client_Type(cl) == CLIENT_SERVICE))) {
 615 #else
 616                         if (Client_Type(cl) != ForceType) {
 617 #endif
 618                                 if (SendErrors && !IRC_WriteErrClient(
 619                                     from, ERR_NOSUCHNICK_MSG,Client_ID(from),
 620                                     currentTarget))
 621                                         return DISCONNECTED;
 622                                 goto send_next_target;
 623                         }
 624
 625 #ifndef STRICT_RFC
 626                         if (ForceType == CLIENT_SERVICE &&
 627                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 628                              & CONN_RFC1459)) {
 629                                 /* SQUERY command but RFC 1459 link: convert
 630                                  * request to PRIVMSG command */
 631                                 Req->command = "PRIVMSG";
 632                         }
 633 #endif
 634                         if (Client_HasMode(cl, 'b') &&
 635                             !Client_HasMode(from, 'R') &&
 636                             !Client_HasMode(from, 'o') &&
 637                             !(Client_Type(from) == CLIENT_SERVER) &&
 638                             !(Client_Type(from) == CLIENT_SERVICE)) {
 639                                 if (SendErrors && !IRC_WriteErrClient(from,
 640                                                 ERR_NONONREG_MSG,
 641                                                 Client_ID(from), Client_ID(cl)))
 642                                         return DISCONNECTED;
 643                                 goto send_next_target;
 644                         }
 645
 646                         if (Client_HasMode(cl, 'C')) {
 647                                 cl2chan = Channel_FirstChannelOf(cl);
 648                                 while (cl2chan) {
 649                                         chan = Channel_GetChannel(cl2chan);
 650                                         if (Channel_IsMemberOf(chan, from))
 651                                                 break;
 652                                         cl2chan = Channel_NextChannelOf(cl, cl2chan);
 653                                 }
 654                                 if (!cl2chan) {
 655                                         if (SendErrors && !IRC_WriteErrClient(
 656                                             from, ERR_NOTONSAMECHANNEL_MSG,
 657                                             Client_ID(from), Client_ID(cl)))
 658                                                 return DISCONNECTED;
 659                                         goto send_next_target;
 660                                 }
 661                         }
 662
 663                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 664                             && Client_HasMode(cl, 'a')) {
 665                                 /* Target is away */
 666                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 667                                                         Client_ID(from),
 668                                                         Client_ID(cl),
 669                                                         Client_Away(cl)))
 670                                         return DISCONNECTED;
 671                         }
 672                         if (Client_Conn(from) > NONE) {
 673                                 Conn_UpdateIdle(Client_Conn(from));
 674                         }
 675                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 676                                                       Req->command, Client_ID(cl),
 677                                                       message))
 678                                 return DISCONNECTED;
 679                 } else if (ForceType != CLIENT_SERVICE
 680                            && (chan = Channel_Search(currentTarget))) {
 681                         if (!Channel_Write(chan, from, Client, Req->command,
 682                                            SendErrors, message))
 683                                         return DISCONNECTED;
 684                 } else if (ForceType != CLIENT_SERVICE
 685                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 686                            && strchr("$#", currentTarget[0])
 687                            && strchr(currentTarget, '.')) {
 688                         /* targetmask */
 689                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 690                                                message, SendErrors))
 691                                 return DISCONNECTED;
 692                 } else {
 693                         if (!SendErrors)
 694                                 return CONNECTED;
 695                         if (!IRC_WriteErrClient(from, ERR_NOSUCHNICK_MSG,
 696                                                 Client_ID(from), currentTarget))
 697                                 return DISCONNECTED;
 698                 }
 699
 700         send_next_target:
 701                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 702                 if (currentTarget)
 703                         Conn_SetPenalty(Client_Conn(Client), 1);
 704         }
 705
 706         return CONNECTED;
 707 } /* Send_Message */
 708
 709 static bool
 710 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 711                   char * message, bool SendErrors)
 712 {
 713         CLIENT *cl;
 714         bool client_match;
 715         char *mask = targetMask + 1;
 716         const char *check_wildcards;
 717
 718         cl = NULL;
 719
 720         if (!Client_HasMode(from, 'o')) {
 721                 if (!SendErrors)
 722                         return true;
 723                 return IRC_WriteErrClient(from, ERR_NOPRIVILEGES_MSG,
 724                                           Client_ID(from));
 725         }
 726
 727         /*
 728          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 729          * dot (".") and no wildcards ("*", "?") following the last one.
 730          */
 731         check_wildcards = strrchr(targetMask, '.');
 732         assert(check_wildcards != NULL);
 733         if (check_wildcards &&
 734                 check_wildcards[strcspn(check_wildcards, "*?")])
 735         {
 736                 if (!SendErrors)
 737                         return true;
 738                 return IRC_WriteErrClient(from, ERR_WILDTOPLEVEL, targetMask);
 739         }
 740
 741         /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 742         if (targetMask[0] == '#') {
 743                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 744                         if (Client_Type(cl) != CLIENT_USER)
 745                                 continue;
 746                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 747                         if (client_match)
 748                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 749                                                 command, Client_ID(cl), message))
 750                                         return false;
 751                 }
 752         } else {
 753                 assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
 754                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 755                         if (Client_Type(cl) != CLIENT_USER)
 756                                 continue;
 757                         client_match = MatchCaseInsensitive(mask,
 758                                         Client_ID(Client_Introducer(cl)));
 759                         if (client_match)
 760                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 761                                                 command, Client_ID(cl), message))
 762                                         return false;
 763                 }
 764         }
 765         return CONNECTED;
 766 } /* Send_Message_Mask */
 767
 768 /* -eof- */