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 <assert.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22
  23 #include "ngircd.h"
  24 #include "conn-func.h"
  25 #include "conf.h"
  26 #include "channel.h"
  27 #include "conn-encoding.h"
  28 #include "defines.h"
  29 #include "irc-macros.h"
  30 #include "irc-write.h"
  31 #include "log.h"
  32 #include "match.h"
  33 #include "messages.h"
  34 #include "parse.h"
  35 #include "op.h"
  36 #include "tool.h"
  37
  38 #include "irc.h"
  39
  40 static char *Option_String PARAMS((CONN_ID Idx));
  41 static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType,
  42                                  bool SendErrors));
  43 static bool Send_Message_Mask PARAMS((CLIENT *from, char *command,
  44                                       char *targetMask, char *message,
  45                                       bool SendErrors));
  46 static bool Help PARAMS((CLIENT *Client, const char *Topic));
  47
  48 /**
  49  * Check if a list limit is reached and inform client accordingly.
  50  *
  51  * @param From The client.
  52  * @param Count Reply item count.
  53  * @param Limit Reply limit.
  54  * @param Name Name of the list.
  55  * @return true if list limit has been reached; false otherwise.
  56  */
  57 GLOBAL bool
  58 IRC_CheckListTooBig(CLIENT *From, const int Count, const int Limit,
  59                     const char *Name)
  60 {
  61         assert(From != NULL);
  62         assert(Count >= 0);
  63         assert(Limit > 0);
  64         assert(Name != NULL);
  65
  66         if (Count < Limit)
  67                 return false;
  68
  69         (void)IRC_WriteStrClient(From,
  70                                  "NOTICE %s :%s list limit (%d) reached!",
  71                                  Client_ID(From), Name, Limit);
  72         IRC_SetPenalty(From, 2);
  73         return true;
  74 }
  75
  76 /**
  77  * Handler for the IRC "ERROR" command.
  78  *
  79  * @param Client The client from which this command has been received.
  80  * @param Req Request structure with prefix and all parameters.
  81  * @return CONNECTED or DISCONNECTED.
  82 */
  83 GLOBAL bool
  84 IRC_ERROR(CLIENT *Client, REQUEST *Req)
  85 {
  86         assert( Client != NULL );
  87         assert( Req != NULL );
  88
  89         if (Client_Type(Client) != CLIENT_GOTPASS
  90             && Client_Type(Client) != CLIENT_GOTPASS_2813
  91             && Client_Type(Client) != CLIENT_UNKNOWNSERVER
  92             && Client_Type(Client) != CLIENT_SERVER
  93             && Client_Type(Client) != CLIENT_SERVICE) {
  94                 LogDebug("Ignored ERROR command from \"%s\" ...",
  95                          Client_Mask(Client));
  96                 IRC_SetPenalty(Client, 2);
  97                 return CONNECTED;
  98         }
  99
 100         if (Req->argc < 1)
 101                 Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
 102                     Client_Mask(Client));
 103         else
 104                 Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
 105                     Client_Mask(Client), Req->argv[0]);
 106
 107         return CONNECTED;
 108 } /* IRC_ERROR */
 109
 110 /**
 111  * Handler for the IRC "KILL" command.
 112  *
 113  * This function implements the IRC command "KILL" which is used to selectively
 114  * disconnect clients. It can be used by IRC operators and servers, for example
 115  * to "solve" nick collisions after netsplits. See RFC 2812 section 3.7.1.
 116  *
 117  * Please note that this function is also called internally, without a real
 118  * KILL command being received over the network! Client is Client_ThisServer()
 119  * in this case, and the prefix in Req is NULL.
 120  *
 121  * @param Client The client from which this command has been received or
 122  * Client_ThisServer() when generated interanlly.
 123  * @param Req Request structure with prefix and all parameters.
 124  * @return CONNECTED or DISCONNECTED.
 125  */
 126 GLOBAL bool
 127 IRC_KILL(CLIENT *Client, REQUEST *Req)
 128 {
 129         CLIENT *prefix;
 130         char reason[COMMAND_LEN];
 131
 132         assert (Client != NULL);
 133         assert (Req != NULL);
 134
 135         if (Client_Type(Client) != CLIENT_SERVER && !Op_Check(Client, Req))
 136                 return Op_NoPrivileges(Client, Req);
 137
 138         /* Get prefix (origin); use the client if no prefix is given. */
 139         if (Req->prefix)
 140                 prefix = Client_Search(Req->prefix);
 141         else
 142                 prefix = Client;
 143
 144         /* Log a warning message and use this server as origin when the
 145          * prefix (origin) is invalid. And this is the reason why we don't
 146          * use the _IRC_GET_SENDER_OR_RETURN_ macro above! */
 147         if (!prefix) {
 148                 Log(LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
 149                     Req->prefix );
 150                 prefix = Client_ThisServer();
 151         }
 152
 153         if (Client != Client_ThisServer())
 154                 Log(LOG_NOTICE|LOG_snotice,
 155                     "Got KILL command from \"%s\" for \"%s\": \"%s\".",
 156                     Client_Mask(prefix), Req->argv[0], Req->argv[1]);
 157
 158         /* Build reason string: Prefix the "reason" if the originator is a
 159          * regular user, so users can't spoof KILLs of servers. */
 160         if (Client_Type(Client) == CLIENT_USER)
 161                 snprintf(reason, sizeof(reason), "KILLed by %s: %s",
 162                          Client_ID(Client), Req->argv[1]);
 163         else
 164                 strlcpy(reason, Req->argv[1], sizeof(reason));
 165
 166         return IRC_KillClient(Client, prefix, Req->argv[0], reason);
 167 }
 168
 169 /**
 170  * Handler for the IRC "NOTICE" command.
 171  *
 172  * @param Client The client from which this command has been received.
 173  * @param Req Request structure with prefix and all parameters.
 174  * @return CONNECTED or DISCONNECTED.
 175 */
 176 GLOBAL bool
 177 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 178 {
 179         return Send_Message(Client, Req, CLIENT_USER, false);
 180 } /* IRC_NOTICE */
 181
 182 /**
 183  * Handler for the IRC "PRIVMSG" command.
 184  *
 185  * @param Client The client from which this command has been received.
 186  * @param Req Request structure with prefix and all parameters.
 187  * @return CONNECTED or DISCONNECTED.
 188  */
 189 GLOBAL bool
 190 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 191 {
 192         return Send_Message(Client, Req, CLIENT_USER, true);
 193 } /* IRC_PRIVMSG */
 194
 195 /**
 196  * Handler for the IRC "SQUERY" command.
 197  *
 198  * @param Client The client from which this command has been received.
 199  * @param Req Request structure with prefix and all parameters.
 200  * @return CONNECTED or DISCONNECTED.
 201  */
 202 GLOBAL bool
 203 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 204 {
 205         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 206 } /* IRC_SQUERY */
 207
 208 /*
 209  * Handler for the IRC "TRACE" command.
 210  *
 211  * @param Client The client from which this command has been received.
 212  * @param Req Request structure with prefix and all parameters.
 213  * @return CONNECTED or DISCONNECTED.
 214  */
 215  GLOBAL bool
 216 IRC_TRACE(CLIENT *Client, REQUEST *Req)
 217 {
 218         CLIENT *from, *target, *c;
 219         CONN_ID idx, idx2;
 220         char user[CLIENT_USER_LEN];
 221
 222         assert(Client != NULL);
 223         assert(Req != NULL);
 224
 225         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 226         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
 227
 228         /* Forward command to other server? */
 229         if (target != Client_ThisServer()) {
 230                 /* Send RPL_TRACELINK back to initiator */
 231                 idx = Client_Conn(Client);
 232                 assert(idx > NONE);
 233                 idx2 = Client_Conn(Client_NextHop(target));
 234                 assert(idx2 > NONE);
 235
 236                 if (!IRC_WriteStrClient(from, RPL_TRACELINK_MSG,
 237                                         Client_ID(from), PACKAGE_NAME,
 238                                         PACKAGE_VERSION, Client_ID(target),
 239                                         Client_ID(Client_NextHop(target)),
 240                                         Option_String(idx2),
 241                                         time(NULL) - Conn_StartTime(idx2),
 242                                         Conn_SendQ(idx), Conn_SendQ(idx2)))
 243                         return DISCONNECTED;
 244
 245                 /* Forward command */
 246                 IRC_WriteStrClientPrefix(target, from, "TRACE %s", Req->argv[0]);
 247                 return CONNECTED;
 248         }
 249
 250         /* Infos about all connected servers */
 251         c = Client_First();
 252         while (c) {
 253                 if (Client_Conn(c) > NONE) {
 254                         /* Local client */
 255                         if (Client_Type(c) == CLIENT_SERVER) {
 256                                 /* Server link */
 257                                 strlcpy(user, Client_User(c), sizeof(user));
 258                                 if (user[0] == '~')
 259                                         strlcpy(user, "unknown", sizeof(user));
 260                                 if (!IRC_WriteStrClient(from,
 261                                                 RPL_TRACESERVER_MSG,
 262                                                 Client_ID(from), Client_ID(c),
 263                                                 user, Client_Hostname(c),
 264                                                 Client_Mask(Client_ThisServer()),
 265                                                 Option_String(Client_Conn(c))))
 266                                         return DISCONNECTED;
 267                         }
 268                         if (Client_Type(c) == CLIENT_USER
 269                             && Client_HasMode(c, 'o')) {
 270                                 /* IRC Operator */
 271                                 if (!IRC_WriteStrClient(from,
 272                                                 RPL_TRACEOPERATOR_MSG,
 273                                                 Client_ID(from), Client_ID(c)))
 274                                         return DISCONNECTED;
 275                         }
 276                 }
 277                 c = Client_Next( c );
 278         }
 279
 280         return IRC_WriteStrClient(from, RPL_TRACEEND_MSG, Client_ID(from),
 281                                   Conf_ServerName, PACKAGE_NAME,
 282                                   PACKAGE_VERSION, NGIRCd_DebugLevel);
 283 } /* IRC_TRACE */
 284
 285 /**
 286  * Handler for the IRC "HELP" command.
 287  *
 288  * @param Client The client from which this command has been received.
 289  * @param Req Request structure with prefix and all parameters.
 290  * @return CONNECTED or DISCONNECTED.
 291  */
 292 GLOBAL bool
 293 IRC_HELP(CLIENT *Client, REQUEST *Req)
 294 {
 295         COMMAND *cmd;
 296
 297         assert(Client != NULL);
 298         assert(Req != NULL);
 299
 300         if ((Req->argc == 0 && array_bytes(&Conf_Helptext) > 0)
 301             || (Req->argc >= 1 && strcasecmp(Req->argv[0], "Commands") != 0)) {
 302                 /* Help text available and requested */
 303                 if (Req->argc >= 1)
 304                         return Help(Client, Req->argv[0]);
 305
 306                 if (!Help(Client, "Intro"))
 307                         return DISCONNECTED;
 308                 return CONNECTED;
 309         }
 310
 311         cmd = Parse_GetCommandStruct();
 312         while(cmd->name) {
 313                 if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 314                                         Client_ID(Client), cmd->name))
 315                         return DISCONNECTED;
 316                 cmd++;
 317         }
 318         return CONNECTED;
 319 } /* IRC_HELP */
 320
 321 /**
 322  * Kill an client identified by its nick name.
 323  *
 324  * Please note that after killig a client, its CLIENT cond CONNECTION
 325  * structures are invalid. So the caller must make sure on its own not to
 326  * access data of probably killed clients after calling this function!
 327  *
 328  * @param Client The client from which the command leading to the KILL has
 329  *              been received, or NULL. The KILL will no be forwarded in this
 330  *              direction. Only relevant when From is set, too.
 331  * @param From The client from which the command originated, or NULL for
 332                 the local server.
 333  * @param Nick The nick name to kill.
 334  * @param Reason Text to send as reason to the client and other servers.
 335  */
 336 GLOBAL bool
 337 IRC_KillClient(CLIENT *Client, CLIENT *From, const char *Nick, const char *Reason)
 338 {
 339         const char *msg;
 340         CONN_ID my_conn, conn;
 341         CLIENT *c;
 342
 343         /* Do we know such a client in the network? */
 344         c = Client_Search(Nick);
 345         if (!c) {
 346                 LogDebug("Client with nick \"%s\" is unknown, not forwaring.", Nick);
 347                 return CONNECTED;
 348         }
 349
 350         /* Inform other servers */
 351         IRC_WriteStrServersPrefix(From ? Client : NULL,
 352                                   From ? From : Client_ThisServer(),
 353                                   "KILL %s :%s", Nick, Reason);
 354
 355         if (Client_Type(c) != CLIENT_USER && Client_Type(c) != CLIENT_GOTNICK) {
 356                 /* Target of this KILL is not a regular user, this is
 357                  * invalid! So we ignore this case if we received a
 358                  * regular KILL from the network and try to kill the
 359                  * client/connection anyway (but log an error!) if the
 360                  * origin is the local server. */
 361
 362                 if (Client != Client_ThisServer()) {
 363                         /* Invalid KILL received from remote */
 364                         if (Client_Type(c) == CLIENT_SERVER)
 365                                 msg = ERR_CANTKILLSERVER_MSG;
 366                         else
 367                                 msg = ERR_NOPRIVILEGES_MSG;
 368                         return IRC_WriteErrClient(Client, msg, Client_ID(Client));
 369                 }
 370
 371                 Log(LOG_ERR,
 372                     "Got KILL for invalid client type: %d, \"%s\"!",
 373                     Client_Type(c), Nick);
 374         }
 375
 376         /* Save ID of this connection */
 377         my_conn = Client_Conn(Client);
 378
 379         /* Kill the client NOW:
 380          *  - Close the local connection (if there is one),
 381          *  - Destroy the CLIENT structure for remote clients.
 382          * Note: Conn_Close() removes the CLIENT structure as well. */
 383         conn = Client_Conn(c);
 384         if(conn > NONE)
 385                 Conn_Close(conn, NULL, Reason, true);
 386         else
 387                 Client_Destroy(c, NULL, Reason, false);
 388
 389         /* Are we still connected or were we killed, too? */
 390         if (my_conn > NONE && Conn_GetClient(my_conn))
 391                 return CONNECTED;
 392         else
 393                 return DISCONNECTED;
 394 }
 395
 396 /**
 397  * Send help for a given topic to the client.
 398  *
 399  * @param Client The client requesting help.
 400  * @param Topoc The help topic requested.
 401  * @return CONNECTED or DISCONNECTED.
 402  */
 403 static bool
 404 Help(CLIENT *Client, const char *Topic)
 405 {
 406         char *line;
 407         size_t helptext_len, len_str, idx_start, lines = 0;
 408         bool in_article = false;
 409
 410         assert(Client != NULL);
 411         assert(Topic != NULL);
 412
 413         helptext_len = array_bytes(&Conf_Helptext);
 414         line = array_start(&Conf_Helptext);
 415         while (helptext_len > 0) {
 416                 len_str = strlen(line) + 1;
 417                 assert(helptext_len >= len_str);
 418                 helptext_len -= len_str;
 419
 420                 if (in_article) {
 421                         /* The first character in each article text line must
 422                          * be a TAB (ASCII 9) character which will be stripped
 423                          * in the output. If it is not a TAB, the end of the
 424                          * article has been reached. */
 425                         if (line[0] != '\t') {
 426                                 if (lines > 0)
 427                                         return CONNECTED;
 428                                 else
 429                                         break;
 430                         }
 431
 432                         /* A single '.' character indicates an empty line */
 433                         if (line[1] == '.' && line[2] == '\0')
 434                                 idx_start = 2;
 435                         else
 436                                 idx_start = 1;
 437
 438                         if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 439                                                 Client_ID(Client),
 440                                                 &line[idx_start]))
 441                                 return DISCONNECTED;
 442                         lines++;
 443
 444                 } else {
 445                         if (line[0] == '-' && line[1] == ' '
 446                             && strcasecmp(&line[2], Topic) == 0)
 447                                 in_article = true;
 448                 }
 449
 450                 line += len_str;
 451         }
 452
 453         /* Help topic not found (or empty)! */
 454         if (!IRC_WriteStrClient(Client, "NOTICE %s :No help for \"%s\" found!",
 455                                 Client_ID(Client), Topic))
 456                 return DISCONNECTED;
 457
 458         return CONNECTED;
 459 }
 460
 461 /**
 462  * Get pointer to a static string representing the connection "options".
 463  *
 464  * @param Idx Connection index.
 465  * @return Pointer to static (global) string buffer.
 466  */
 467 static char *
 468 #ifdef ZLIB
 469 Option_String(CONN_ID Idx)
 470 #else
 471 Option_String(UNUSED CONN_ID Idx)
 472 #endif
 473 {
 474         static char option_txt[8];
 475         UINT16 options;
 476
 477         assert(Idx != NONE);
 478
 479         options = Conn_Options(Idx);
 480         strcpy(option_txt, "F");        /* No idea what this means, but the
 481                                          * original ircd sends it ... */
 482 #ifdef SSL_SUPPORT
 483         if(options & CONN_SSL)          /* SSL encrypted link */
 484                 strlcat(option_txt, "s", sizeof(option_txt));
 485 #endif
 486 #ifdef ZLIB
 487         if(options & CONN_ZIP)          /* zlib compression enabled */
 488                 strlcat(option_txt, "z", sizeof(option_txt));
 489 #endif
 490         LogDebug(" *** %d: %d = %s", Idx, options, option_txt);
 491
 492         return option_txt;
 493 } /* Option_String */
 494
 495 static bool
 496 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 497 {
 498         CLIENT *cl, *from;
 499         CL2CHAN *cl2chan;
 500         CHANNEL *chan;
 501         char *currentTarget = Req->argv[0];
 502         char *lastCurrentTarget = NULL;
 503         char *message = NULL;
 504
 505         assert(Client != NULL);
 506         assert(Req != NULL);
 507
 508         if (Req->argc == 0) {
 509                 if (!SendErrors)
 510                         return CONNECTED;
 511                 return IRC_WriteErrClient(Client, ERR_NORECIPIENT_MSG,
 512                                           Client_ID(Client), Req->command);
 513         }
 514         if (Req->argc == 1) {
 515                 if (!SendErrors)
 516                         return CONNECTED;
 517                 return IRC_WriteErrClient(Client, ERR_NOTEXTTOSEND_MSG,
 518                                           Client_ID(Client));
 519         }
 520         if (Req->argc > 2) {
 521                 if (!SendErrors)
 522                         return CONNECTED;
 523                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 524                                           Client_ID(Client), Req->command);
 525         }
 526
 527         if (Client_Type(Client) == CLIENT_SERVER)
 528                 from = Client_Search(Req->prefix);
 529         else
 530                 from = Client;
 531         if (!from)
 532                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 533                                           Client_ID(Client), Req->prefix);
 534
 535 #ifdef ICONV
 536         if (Client_Conn(Client) > NONE)
 537                 message = Conn_EncodingFrom(Client_Conn(Client), Req->argv[1]);
 538         else
 539 #endif
 540                 message = Req->argv[1];
 541
 542         /* handle msgtarget = msgto *("," msgto) */
 543         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 544         ngt_UpperStr(Req->command);
 545
 546         while (currentTarget) {
 547                 /* Check for and handle valid <msgto> of form:
 548                  * RFC 2812 2.3.1:
 549                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 550                  *   msgto =/ ( user "%" host ) / targetmask
 551                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 552                  */
 553                 if (strchr(currentTarget, '!') == NULL)
 554                         /* nickname */
 555                         cl = Client_Search(currentTarget);
 556                 else
 557                         cl = NULL;
 558
 559                 if (cl == NULL) {
 560                         /* If currentTarget isn't a nickname check for:
 561                          * user ["%" host] "@" servername
 562                          * user "%" host
 563                          * nickname "!" user "@" host
 564                          */
 565                         char target[COMMAND_LEN];
 566                         char * nick = NULL;
 567                         char * user = NULL;
 568                         char * host = NULL;
 569                         char * server = NULL;
 570
 571                         strlcpy(target, currentTarget, COMMAND_LEN);
 572                         server = strchr(target, '@');
 573                         if (server) {
 574                                 *server = '\0';
 575                                 server++;
 576                         }
 577                         host = strchr(target, '%');
 578                         if (host) {
 579                                 *host = '\0';
 580                                 host++;
 581                         }
 582                         user = strchr(target, '!');
 583                         if (user) {
 584                                 /* msgto form: nick!user@host */
 585                                 *user = '\0';
 586                                 user++;
 587                                 nick = target;
 588                                 host = server; /* not "@server" but "@host" */
 589                         } else {
 590                                 user = target;
 591                         }
 592
 593                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 594                                 if (Client_Type(cl) != CLIENT_USER &&
 595                                     Client_Type(cl) != CLIENT_SERVICE)
 596                                         continue;
 597                                 if (nick != NULL && host != NULL) {
 598                                         if (strcasecmp(nick, Client_ID(cl)) == 0 &&
 599                                             strcasecmp(user, Client_User(cl)) == 0 &&
 600                                             strcasecmp(host, Client_HostnameDisplayed(cl)) == 0)
 601                                                 break;
 602                                         else
 603                                                 continue;
 604                                 }
 605                                 if (strcasecmp(user, Client_User(cl)) != 0)
 606                                         continue;
 607                                 if (host != NULL && strcasecmp(host,
 608                                                 Client_HostnameDisplayed(cl)) != 0)
 609                                         continue;
 610                                 if (server != NULL && strcasecmp(server,
 611                                                 Client_ID(Client_Introducer(cl))) != 0)
 612                                         continue;
 613                                 break;
 614                         }
 615                 }
 616
 617                 if (cl) {
 618                         /* Target is a user, enforce type */
 619 #ifndef STRICT_RFC
 620                         if (Client_Type(cl) != ForceType &&
 621                             !(ForceType == CLIENT_USER &&
 622                               (Client_Type(cl) == CLIENT_USER ||
 623                                Client_Type(cl) == CLIENT_SERVICE))) {
 624 #else
 625                         if (Client_Type(cl) != ForceType) {
 626 #endif
 627                                 if (SendErrors && !IRC_WriteErrClient(
 628                                     from, ERR_NOSUCHNICK_MSG,Client_ID(from),
 629                                     currentTarget))
 630                                         return DISCONNECTED;
 631                                 goto send_next_target;
 632                         }
 633
 634 #ifndef STRICT_RFC
 635                         if (ForceType == CLIENT_SERVICE &&
 636                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 637                              & CONN_RFC1459)) {
 638                                 /* SQUERY command but RFC 1459 link: convert
 639                                  * request to PRIVMSG command */
 640                                 Req->command = "PRIVMSG";
 641                         }
 642 #endif
 643                         if (Client_HasMode(cl, 'b') &&
 644                             !Client_HasMode(from, 'R') &&
 645                             !Client_HasMode(from, 'o') &&
 646                             !(Client_Type(from) == CLIENT_SERVER) &&
 647                             !(Client_Type(from) == CLIENT_SERVICE)) {
 648                                 if (SendErrors && !IRC_WriteErrClient(from,
 649                                                 ERR_NONONREG_MSG,
 650                                                 Client_ID(from), Client_ID(cl)))
 651                                         return DISCONNECTED;
 652                                 goto send_next_target;
 653                         }
 654
 655                         if (Client_HasMode(cl, 'C')) {
 656                                 cl2chan = Channel_FirstChannelOf(cl);
 657                                 while (cl2chan) {
 658                                         chan = Channel_GetChannel(cl2chan);
 659                                         if (Channel_IsMemberOf(chan, from))
 660                                                 break;
 661                                         cl2chan = Channel_NextChannelOf(cl, cl2chan);
 662                                 }
 663                                 if (!cl2chan) {
 664                                         if (SendErrors && !IRC_WriteErrClient(
 665                                             from, ERR_NOTONSAMECHANNEL_MSG,
 666                                             Client_ID(from), Client_ID(cl)))
 667                                                 return DISCONNECTED;
 668                                         goto send_next_target;
 669                                 }
 670                         }
 671
 672                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 673                             && Client_HasMode(cl, 'a')) {
 674                                 /* Target is away */
 675                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 676                                                         Client_ID(from),
 677                                                         Client_ID(cl),
 678                                                         Client_Away(cl)))
 679                                         return DISCONNECTED;
 680                         }
 681                         if (Client_Conn(from) > NONE) {
 682                                 Conn_UpdateIdle(Client_Conn(from));
 683                         }
 684                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 685                                                       Req->command, Client_ID(cl),
 686                                                       message))
 687                                 return DISCONNECTED;
 688                 } else if (ForceType != CLIENT_SERVICE
 689                            && (chan = Channel_Search(currentTarget))) {
 690                         if (!Channel_Write(chan, from, Client, Req->command,
 691                                            SendErrors, message))
 692                                         return DISCONNECTED;
 693                 } else if (ForceType != CLIENT_SERVICE
 694                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 695                            && strchr("$#", currentTarget[0])
 696                            && strchr(currentTarget, '.')) {
 697                         /* targetmask */
 698                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 699                                                message, SendErrors))
 700                                 return DISCONNECTED;
 701                 } else {
 702                         if (!SendErrors)
 703                                 return CONNECTED;
 704                         if (!IRC_WriteErrClient(from, ERR_NOSUCHNICK_MSG,
 705                                                 Client_ID(from), currentTarget))
 706                                 return DISCONNECTED;
 707                 }
 708
 709         send_next_target:
 710                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 711                 if (currentTarget)
 712                         Conn_SetPenalty(Client_Conn(Client), 1);
 713         }
 714
 715         return CONNECTED;
 716 } /* Send_Message */
 717
 718 static bool
 719 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 720                   char * message, bool SendErrors)
 721 {
 722         CLIENT *cl;
 723         bool client_match;
 724         char *mask = targetMask + 1;
 725         const char *check_wildcards;
 726
 727         cl = NULL;
 728
 729         if (!Client_HasMode(from, 'o')) {
 730                 if (!SendErrors)
 731                         return true;
 732                 return IRC_WriteErrClient(from, ERR_NOPRIVILEGES_MSG,
 733                                           Client_ID(from));
 734         }
 735
 736         /*
 737          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 738          * dot (".") and no wildcards ("*", "?") following the last one.
 739          */
 740         check_wildcards = strrchr(targetMask, '.');
 741         assert(check_wildcards != NULL);
 742         if (check_wildcards &&
 743                 check_wildcards[strcspn(check_wildcards, "*?")])
 744         {
 745                 if (!SendErrors)
 746                         return true;
 747                 return IRC_WriteErrClient(from, ERR_WILDTOPLEVEL, targetMask);
 748         }
 749
 750         /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 751         if (targetMask[0] == '#') {
 752                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 753                         if (Client_Type(cl) != CLIENT_USER)
 754                                 continue;
 755                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 756                         if (client_match)
 757                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 758                                                 command, Client_ID(cl), message))
 759                                         return false;
 760                 }
 761         } else {
 762                 assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
 763                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 764                         if (Client_Type(cl) != CLIENT_USER)
 765                                 continue;
 766                         client_match = MatchCaseInsensitive(mask,
 767                                         Client_ID(Client_Introducer(cl)));
 768                         if (client_match)
 769                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 770                                                 command, Client_ID(cl), message))
 771                                         return false;
 772                 }
 773         }
 774         return CONNECTED;
 775 } /* Send_Message_Mask */
 776
 777 /* -eof- */