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         _IRC_ARGC_EQ_OR_RETURN_(Client, Req, 2)
 142
 143         /* Get prefix (origin); use the client if no prefix is given. */
 144         if (Req->prefix)
 145                 prefix = Client_Search(Req->prefix);
 146         else
 147                 prefix = Client;
 148
 149         /* Log a warning message and use this server as origin when the
 150          * prefix (origin) is invalid. And this is the reason why we don't
 151          * use the _IRC_GET_SENDER_OR_RETURN_ macro above! */
 152         if (!prefix) {
 153                 Log(LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
 154                     Req->prefix );
 155                 prefix = Client_ThisServer();
 156         }
 157
 158         if (Client != Client_ThisServer())
 159                 Log(LOG_NOTICE|LOG_snotice,
 160                     "Got KILL command from \"%s\" for \"%s\": \"%s\".",
 161                     Client_Mask(prefix), Req->argv[0], Req->argv[1]);
 162
 163         /* Build reason string: Prefix the "reason" if the originator is a
 164          * regular user, so users can't spoof KILLs of servers. */
 165         if (Client_Type(Client) == CLIENT_USER)
 166                 snprintf(reason, sizeof(reason), "KILLed by %s: %s",
 167                          Client_ID(Client), Req->argv[1]);
 168         else
 169                 strlcpy(reason, Req->argv[1], sizeof(reason));
 170
 171         /* Inform other servers */
 172         IRC_WriteStrServersPrefix(Client, prefix, "KILL %s :%s",
 173                                   Req->argv[0], reason);
 174
 175         /* Save ID of this connection */
 176         my_conn = Client_Conn( Client );
 177
 178         /* Do we host such a client? */
 179         c = Client_Search( Req->argv[0] );
 180         if (c) {
 181                 if (Client_Type(c) != CLIENT_USER
 182                     && Client_Type(c) != CLIENT_GOTNICK) {
 183                         /* Target of this KILL is not a regular user, this is
 184                          * invalid! So we ignore this case if we received a
 185                          * regular KILL from the network and try to kill the
 186                          * client/connection anyway (but log an error!) if the
 187                          * origin is the local server. */
 188
 189                         if (Client != Client_ThisServer()) {
 190                                 /* Invalid KILL received from remote */
 191                                 if (Client_Type(c) == CLIENT_SERVER)
 192                                         msg = ERR_CANTKILLSERVER_MSG;
 193                                 else
 194                                         msg = ERR_NOPRIVILEGES_MSG;
 195                                 return IRC_WriteErrClient(Client, msg,
 196                                                           Client_ID(Client));
 197                         }
 198
 199                         Log(LOG_ERR,
 200                             "Got KILL for invalid client type: %d, \"%s\"!",
 201                             Client_Type( c ), Req->argv[0] );
 202                 }
 203
 204                 /* Kill the client NOW:
 205                  *  - Close the local connection (if there is one),
 206                  *  - Destroy the CLIENT structure for remote clients.
 207                  * Note: Conn_Close() removes the CLIENT structure as well. */
 208                 conn = Client_Conn( c );
 209                 if(conn > NONE)
 210                         Conn_Close(conn, NULL, reason, true);
 211                 else
 212                         Client_Destroy(c, NULL, reason, false);
 213         }
 214         else
 215                 Log(LOG_NOTICE, "Client with nick \"%s\" is unknown here.",
 216                     Req->argv[0]);
 217
 218         /* Are we still connected or were we killed, too? */
 219         if (my_conn > NONE && Conn_GetClient(my_conn))
 220                 return CONNECTED;
 221         else
 222                 return DISCONNECTED;
 223 } /* IRC_KILL */
 224
 225 /**
 226  * Handler for the IRC "NOTICE" command.
 227  *
 228  * @param Client The client from which this command has been received.
 229  * @param Req Request structure with prefix and all parameters.
 230  * @return CONNECTED or DISCONNECTED.
 231 */
 232 GLOBAL bool
 233 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 234 {
 235         return Send_Message(Client, Req, CLIENT_USER, false);
 236 } /* IRC_NOTICE */
 237
 238 /**
 239  * Handler for the IRC "PRIVMSG" command.
 240  *
 241  * @param Client The client from which this command has been received.
 242  * @param Req Request structure with prefix and all parameters.
 243  * @return CONNECTED or DISCONNECTED.
 244  */
 245 GLOBAL bool
 246 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 247 {
 248         return Send_Message(Client, Req, CLIENT_USER, true);
 249 } /* IRC_PRIVMSG */
 250
 251 /**
 252  * Handler for the IRC "SQUERY" command.
 253  *
 254  * @param Client The client from which this command has been received.
 255  * @param Req Request structure with prefix and all parameters.
 256  * @return CONNECTED or DISCONNECTED.
 257  */
 258 GLOBAL bool
 259 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 260 {
 261         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 262 } /* IRC_SQUERY */
 263
 264 /*
 265  * Handler for the IRC "TRACE" command.
 266  *
 267  * @param Client The client from which this command has been received.
 268  * @param Req Request structure with prefix and all parameters.
 269  * @return CONNECTED or DISCONNECTED.
 270  */
 271  GLOBAL bool
 272 IRC_TRACE(CLIENT *Client, REQUEST *Req)
 273 {
 274         CLIENT *from, *target, *c;
 275         CONN_ID idx, idx2;
 276         char user[CLIENT_USER_LEN];
 277
 278         assert(Client != NULL);
 279         assert(Req != NULL);
 280
 281         IRC_SetPenalty(Client, 3);
 282
 283         /* Bad number of arguments? */
 284         if (Req->argc > 1)
 285                 return IRC_WriteErrClient(Client, ERR_NORECIPIENT_MSG,
 286                                           Client_ID(Client), Req->command);
 287
 288         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 289         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
 290
 291         /* Forward command to other server? */
 292         if (target != Client_ThisServer()) {
 293                 /* Send RPL_TRACELINK back to initiator */
 294                 idx = Client_Conn(Client);
 295                 assert(idx > NONE);
 296                 idx2 = Client_Conn(Client_NextHop(target));
 297                 assert(idx2 > NONE);
 298
 299                 if (!IRC_WriteStrClient(from, RPL_TRACELINK_MSG,
 300                                         Client_ID(from), PACKAGE_NAME,
 301                                         PACKAGE_VERSION, Client_ID(target),
 302                                         Client_ID(Client_NextHop(target)),
 303                                         Option_String(idx2),
 304                                         time(NULL) - Conn_StartTime(idx2),
 305                                         Conn_SendQ(idx), Conn_SendQ(idx2)))
 306                         return DISCONNECTED;
 307
 308                 /* Forward command */
 309                 IRC_WriteStrClientPrefix(target, from, "TRACE %s", Req->argv[0]);
 310                 return CONNECTED;
 311         }
 312
 313         /* Infos about all connected servers */
 314         c = Client_First();
 315         while (c) {
 316                 if (Client_Conn(c) > NONE) {
 317                         /* Local client */
 318                         if (Client_Type(c) == CLIENT_SERVER) {
 319                                 /* Server link */
 320                                 strlcpy(user, Client_User(c), sizeof(user));
 321                                 if (user[0] == '~')
 322                                         strlcpy(user, "unknown", sizeof(user));
 323                                 if (!IRC_WriteStrClient(from,
 324                                                 RPL_TRACESERVER_MSG,
 325                                                 Client_ID(from), Client_ID(c),
 326                                                 user, Client_Hostname(c),
 327                                                 Client_Mask(Client_ThisServer()),
 328                                                 Option_String(Client_Conn(c))))
 329                                         return DISCONNECTED;
 330                         }
 331                         if (Client_Type(c) == CLIENT_USER
 332                             && Client_HasMode(c, 'o')) {
 333                                 /* IRC Operator */
 334                                 if (!IRC_WriteStrClient(from,
 335                                                 RPL_TRACEOPERATOR_MSG,
 336                                                 Client_ID(from), Client_ID(c)))
 337                                         return DISCONNECTED;
 338                         }
 339                 }
 340                 c = Client_Next( c );
 341         }
 342
 343         return IRC_WriteStrClient(from, RPL_TRACEEND_MSG, Client_ID(from),
 344                                   Conf_ServerName, PACKAGE_NAME,
 345                                   PACKAGE_VERSION, NGIRCd_DebugLevel);
 346 } /* IRC_TRACE */
 347
 348 /**
 349  * Handler for the IRC "HELP" command.
 350  *
 351  * @param Client The client from which this command has been received.
 352  * @param Req Request structure with prefix and all parameters.
 353  * @return CONNECTED or DISCONNECTED.
 354  */
 355 GLOBAL bool
 356 IRC_HELP(CLIENT *Client, REQUEST *Req)
 357 {
 358         COMMAND *cmd;
 359
 360         assert(Client != NULL);
 361         assert(Req != NULL);
 362
 363         IRC_SetPenalty(Client, 2);
 364
 365         _IRC_ARGC_LE_OR_RETURN_(Client, Req, 1)
 366
 367         if ((Req->argc == 0 && array_bytes(&Conf_Helptext) > 0)
 368             || (Req->argc >= 1 && strcasecmp(Req->argv[0], "Commands") != 0)) {
 369                 /* Help text available and requested */
 370                 if (Req->argc >= 1)
 371                         return Help(Client, Req->argv[0]);
 372
 373                 if (!Help(Client, "Intro"))
 374                         return DISCONNECTED;
 375                 return CONNECTED;
 376         }
 377
 378         cmd = Parse_GetCommandStruct();
 379         while(cmd->name) {
 380                 if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 381                                         Client_ID(Client), cmd->name))
 382                         return DISCONNECTED;
 383                 cmd++;
 384         }
 385         return CONNECTED;
 386 } /* IRC_HELP */
 387
 388 /**
 389  * Send help for a given topic to the client.
 390  *
 391  * @param Client The client requesting help.
 392  * @param Topoc The help topic requested.
 393  * @return CONNECTED or DISCONNECTED.
 394  */
 395 static bool
 396 Help(CLIENT *Client, const char *Topic)
 397 {
 398         char *line;
 399         size_t helptext_len, len_str, idx_start, lines = 0;
 400         bool in_article = false;
 401
 402         assert(Client != NULL);
 403         assert(Topic != NULL);
 404
 405         helptext_len = array_bytes(&Conf_Helptext);
 406         line = array_start(&Conf_Helptext);
 407         while (helptext_len > 0) {
 408                 len_str = strlen(line) + 1;
 409                 assert(helptext_len >= len_str);
 410                 helptext_len -= len_str;
 411
 412                 if (in_article) {
 413                         /* The first character in each article text line must
 414                          * be a TAB (ASCII 9) character which will be stripped
 415                          * in the output. If it is not a TAB, the end of the
 416                          * article has been reached. */
 417                         if (line[0] != '\t') {
 418                                 if (lines > 0)
 419                                         return CONNECTED;
 420                                 else
 421                                         break;
 422                         }
 423
 424                         /* A single '.' character indicates an empty line */
 425                         if (line[1] == '.' && line[2] == '\0')
 426                                 idx_start = 2;
 427                         else
 428                                 idx_start = 1;
 429
 430                         if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 431                                                 Client_ID(Client),
 432                                                 &line[idx_start]))
 433                                 return DISCONNECTED;
 434                         lines++;
 435
 436                 } else {
 437                         if (line[0] == '-' && line[1] == ' '
 438                             && strcasecmp(&line[2], Topic) == 0)
 439                                 in_article = true;
 440                 }
 441
 442                 line += len_str;
 443         }
 444
 445         /* Help topic not found (or empty)! */
 446         if (!IRC_WriteStrClient(Client, "NOTICE %s :No help for \"%s\" found!",
 447                                 Client_ID(Client), Topic))
 448                 return DISCONNECTED;
 449
 450         return CONNECTED;
 451 }
 452
 453 /**
 454  * Get pointer to a static string representing the connection "options".
 455  *
 456  * @param Idx Connection index.
 457  * @return Pointer to static (global) string buffer.
 458  */
 459 static char *
 460 #ifdef ZLIB
 461 Option_String(CONN_ID Idx)
 462 #else
 463 Option_String(UNUSED CONN_ID Idx)
 464 #endif
 465 {
 466         static char option_txt[8];
 467 #ifdef ZLIB
 468         UINT16 options;
 469 #endif
 470
 471         assert(Idx != NONE);
 472
 473         options = Conn_Options(Idx);
 474         strcpy(option_txt, "F");        /* No idea what this means, but the
 475                                          * original ircd sends it ... */
 476 #ifdef SSL_SUPPORT
 477         if(options & CONN_SSL)          /* SSL encrypted link */
 478                 strlcat(option_txt, "s", sizeof(option_txt));
 479 #endif
 480 #ifdef ZLIB
 481         if(options & CONN_ZIP)          /* zlib compression enabled */
 482                 strlcat(option_txt, "z", sizeof(option_txt));
 483 #endif
 484         LogDebug(" *** %d: %d = %s", Idx, options, option_txt);
 485
 486         return option_txt;
 487 } /* Option_String */
 488
 489 static bool
 490 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 491 {
 492         CLIENT *cl, *from;
 493         CL2CHAN *cl2chan;
 494         CHANNEL *chan;
 495         char *currentTarget = Req->argv[0];
 496         char *lastCurrentTarget = NULL;
 497         char *message = NULL;
 498
 499         assert(Client != NULL);
 500         assert(Req != NULL);
 501
 502         if (Req->argc == 0) {
 503                 if (!SendErrors)
 504                         return CONNECTED;
 505                 return IRC_WriteErrClient(Client, ERR_NORECIPIENT_MSG,
 506                                           Client_ID(Client), Req->command);
 507         }
 508         if (Req->argc == 1) {
 509                 if (!SendErrors)
 510                         return CONNECTED;
 511                 return IRC_WriteErrClient(Client, ERR_NOTEXTTOSEND_MSG,
 512                                           Client_ID(Client));
 513         }
 514         if (Req->argc > 2) {
 515                 if (!SendErrors)
 516                         return CONNECTED;
 517                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 518                                           Client_ID(Client), Req->command);
 519         }
 520
 521         if (Client_Type(Client) == CLIENT_SERVER)
 522                 from = Client_Search(Req->prefix);
 523         else
 524                 from = Client;
 525         if (!from)
 526                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 527                                           Client_ID(Client), Req->prefix);
 528
 529 #ifdef ICONV
 530         if (Client_Conn(Client) > NONE)
 531                 message = Conn_EncodingFrom(Client_Conn(Client), Req->argv[1]);
 532         else
 533 #endif
 534                 message = Req->argv[1];
 535
 536         /* handle msgtarget = msgto *("," msgto) */
 537         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 538         ngt_UpperStr(Req->command);
 539
 540         while (currentTarget) {
 541                 /* Check for and handle valid <msgto> of form:
 542                  * RFC 2812 2.3.1:
 543                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 544                  *   msgto =/ ( user "%" host ) / targetmask
 545                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 546                  */
 547                 if (strchr(currentTarget, '!') == NULL)
 548                         /* nickname */
 549                         cl = Client_Search(currentTarget);
 550                 else
 551                         cl = NULL;
 552
 553                 if (cl == NULL) {
 554                         /* If currentTarget isn't a nickname check for:
 555                          * user ["%" host] "@" servername
 556                          * user "%" host
 557                          * nickname "!" user "@" host
 558                          */
 559                         char target[COMMAND_LEN];
 560                         char * nick = NULL;
 561                         char * user = NULL;
 562                         char * host = NULL;
 563                         char * server = NULL;
 564
 565                         strlcpy(target, currentTarget, COMMAND_LEN);
 566                         server = strchr(target, '@');
 567                         if (server) {
 568                                 *server = '\0';
 569                                 server++;
 570                         }
 571                         host = strchr(target, '%');
 572                         if (host) {
 573                                 *host = '\0';
 574                                 host++;
 575                         }
 576                         user = strchr(target, '!');
 577                         if (user) {
 578                                 /* msgto form: nick!user@host */
 579                                 *user = '\0';
 580                                 user++;
 581                                 nick = target;
 582                                 host = server; /* not "@server" but "@host" */
 583                         } else {
 584                                 user = target;
 585                         }
 586
 587                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 588                                 if (Client_Type(cl) != CLIENT_USER &&
 589                                     Client_Type(cl) != CLIENT_SERVICE)
 590                                         continue;
 591                                 if (nick != NULL && host != NULL) {
 592                                         if (strcasecmp(nick, Client_ID(cl)) == 0 &&
 593                                             strcasecmp(user, Client_User(cl)) == 0 &&
 594                                             strcasecmp(host, Client_HostnameDisplayed(cl)) == 0)
 595                                                 break;
 596                                         else
 597                                                 continue;
 598                                 }
 599                                 if (strcasecmp(user, Client_User(cl)) != 0)
 600                                         continue;
 601                                 if (host != NULL && strcasecmp(host,
 602                                                 Client_HostnameDisplayed(cl)) != 0)
 603                                         continue;
 604                                 if (server != NULL && strcasecmp(server,
 605                                                 Client_ID(Client_Introducer(cl))) != 0)
 606                                         continue;
 607                                 break;
 608                         }
 609                 }
 610
 611                 if (cl) {
 612                         /* Target is a user, enforce type */
 613 #ifndef STRICT_RFC
 614                         if (Client_Type(cl) != ForceType &&
 615                             !(ForceType == CLIENT_USER &&
 616                               (Client_Type(cl) == CLIENT_USER ||
 617                                Client_Type(cl) == CLIENT_SERVICE))) {
 618 #else
 619                         if (Client_Type(cl) != ForceType) {
 620 #endif
 621                                 if (SendErrors && !IRC_WriteErrClient(
 622                                     from, ERR_NOSUCHNICK_MSG,Client_ID(from),
 623                                     currentTarget))
 624                                         return DISCONNECTED;
 625                                 goto send_next_target;
 626                         }
 627
 628 #ifndef STRICT_RFC
 629                         if (ForceType == CLIENT_SERVICE &&
 630                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 631                              & CONN_RFC1459)) {
 632                                 /* SQUERY command but RFC 1459 link: convert
 633                                  * request to PRIVMSG command */
 634                                 Req->command = "PRIVMSG";
 635                         }
 636 #endif
 637                         if (Client_HasMode(cl, 'b') &&
 638                             !Client_HasMode(from, 'R') &&
 639                             !Client_HasMode(from, 'o') &&
 640                             !(Client_Type(from) == CLIENT_SERVER) &&
 641                             !(Client_Type(from) == CLIENT_SERVICE)) {
 642                                 if (SendErrors && !IRC_WriteErrClient(from,
 643                                                 ERR_NONONREG_MSG,
 644                                                 Client_ID(from), Client_ID(cl)))
 645                                         return DISCONNECTED;
 646                                 goto send_next_target;
 647                         }
 648
 649                         if (Client_HasMode(cl, 'C')) {
 650                                 cl2chan = Channel_FirstChannelOf(cl);
 651                                 while (cl2chan) {
 652                                         chan = Channel_GetChannel(cl2chan);
 653                                         if (Channel_IsMemberOf(chan, from))
 654                                                 break;
 655                                         cl2chan = Channel_NextChannelOf(cl, cl2chan);
 656                                 }
 657                                 if (!cl2chan) {
 658                                         if (SendErrors && !IRC_WriteErrClient(
 659                                             from, ERR_NOTONSAMECHANNEL_MSG,
 660                                             Client_ID(from), Client_ID(cl)))
 661                                                 return DISCONNECTED;
 662                                         goto send_next_target;
 663                                 }
 664                         }
 665
 666                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 667                             && Client_HasMode(cl, 'a')) {
 668                                 /* Target is away */
 669                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 670                                                         Client_ID(from),
 671                                                         Client_ID(cl),
 672                                                         Client_Away(cl)))
 673                                         return DISCONNECTED;
 674                         }
 675                         if (Client_Conn(from) > NONE) {
 676                                 Conn_UpdateIdle(Client_Conn(from));
 677                         }
 678                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 679                                                       Req->command, Client_ID(cl),
 680                                                       message))
 681                                 return DISCONNECTED;
 682                 } else if (ForceType != CLIENT_SERVICE
 683                            && (chan = Channel_Search(currentTarget))) {
 684                         if (!Channel_Write(chan, from, Client, Req->command,
 685                                            SendErrors, message))
 686                                         return DISCONNECTED;
 687                 } else if (ForceType != CLIENT_SERVICE
 688                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 689                            && strchr("$#", currentTarget[0])
 690                            && strchr(currentTarget, '.')) {
 691                         /* targetmask */
 692                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 693                                                message, SendErrors))
 694                                 return DISCONNECTED;
 695                 } else {
 696                         if (!SendErrors)
 697                                 return CONNECTED;
 698                         if (!IRC_WriteErrClient(from, ERR_NOSUCHNICK_MSG,
 699                                                 Client_ID(from), currentTarget))
 700                                 return DISCONNECTED;
 701                 }
 702
 703         send_next_target:
 704                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 705                 if (currentTarget)
 706                         Conn_SetPenalty(Client_Conn(Client), 1);
 707         }
 708
 709         return CONNECTED;
 710 } /* Send_Message */
 711
 712 static bool
 713 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 714                   char * message, bool SendErrors)
 715 {
 716         CLIENT *cl;
 717         bool client_match;
 718         char *mask = targetMask + 1;
 719         const char *check_wildcards;
 720
 721         cl = NULL;
 722
 723         if (!Client_HasMode(from, 'o')) {
 724                 if (!SendErrors)
 725                         return true;
 726                 return IRC_WriteErrClient(from, ERR_NOPRIVILEGES_MSG,
 727                                           Client_ID(from));
 728         }
 729
 730         /*
 731          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 732          * dot (".") and no wildcards ("*", "?") following the last one.
 733          */
 734         check_wildcards = strrchr(targetMask, '.');
 735         assert(check_wildcards != NULL);
 736         if (check_wildcards &&
 737                 check_wildcards[strcspn(check_wildcards, "*?")])
 738         {
 739                 if (!SendErrors)
 740                         return true;
 741                 return IRC_WriteErrClient(from, ERR_WILDTOPLEVEL, targetMask);
 742         }
 743
 744         /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 745         if (targetMask[0] == '#') {
 746                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 747                         if (Client_Type(cl) != CLIENT_USER)
 748                                 continue;
 749                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 750                         if (client_match)
 751                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 752                                                 command, Client_ID(cl), message))
 753                                         return false;
 754                 }
 755         } else {
 756                 assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
 757                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 758                         if (Client_Type(cl) != CLIENT_USER)
 759                                 continue;
 760                         client_match = MatchCaseInsensitive(mask,
 761                                         Client_ID(Client_Introducer(cl)));
 762                         if (client_match)
 763                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 764                                                 command, Client_ID(cl), message))
 765                                         return false;
 766                 }
 767         }
 768         return CONNECTED;
 769 } /* Send_Message_Mask */
 770
 771 /* -eof- */