src/ngircd/irc.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2013 Alexander Barton (alex@barton.de) and Contributors.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  * Please read the file COPYING, README and AUTHORS for more information.
  10  */
  11
  12 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "ngircd.h"
  25 #include "conn-func.h"
  26 #include "conf.h"
  27 #include "channel.h"
  28 #include "conn-encoding.h"
  29 #include "defines.h"
  30 #include "irc-macros.h"
  31 #include "irc-write.h"
  32 #include "log.h"
  33 #include "match.h"
  34 #include "messages.h"
  35 #include "parse.h"
  36 #include "op.h"
  37 #include "tool.h"
  38
  39 #include "exp.h"
  40 #include "irc.h"
  41
  42 static char *Option_String PARAMS((CONN_ID Idx));
  43 static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType,
  44                                  bool SendErrors));
  45 static bool Send_Message_Mask PARAMS((CLIENT *from, char *command,
  46                                       char *targetMask, char *message,
  47                                       bool SendErrors));
  48 static bool Help PARAMS((CLIENT *Client, const char *Topic));
  49
  50 /**
  51  * Check if a list limit is reached and inform client accordingly.
  52  *
  53  * @param From The client.
  54  * @param Count Reply item count.
  55  * @param Limit Reply limit.
  56  * @param Name Name of the list.
  57  * @return true if list limit has been reached; false otherwise.
  58  */
  59 GLOBAL bool
  60 IRC_CheckListTooBig(CLIENT *From, const int Count, const int Limit,
  61                     const char *Name)
  62 {
  63         assert(From != NULL);
  64         assert(Count >= 0);
  65         assert(Limit > 0);
  66         assert(Name != NULL);
  67
  68         if (Count < Limit)
  69                 return false;
  70
  71         (void)IRC_WriteStrClient(From,
  72                                  "NOTICE %s :%s list limit (%d) reached!",
  73                                  Client_ID(From), Name, Limit);
  74         IRC_SetPenalty(From, 2);
  75         return true;
  76 }
  77
  78 /**
  79  * Handler for the IRC "ERROR" command.
  80  *
  81  * @param Client The client from which this command has been received.
  82  * @param Req Request structure with prefix and all parameters.
  83  * @return CONNECTED or DISCONNECTED.
  84 */
  85 GLOBAL bool
  86 IRC_ERROR(CLIENT *Client, REQUEST *Req)
  87 {
  88         assert( Client != NULL );
  89         assert( Req != NULL );
  90
  91         if (Client_Type(Client) != CLIENT_GOTPASS
  92             && Client_Type(Client) != CLIENT_GOTPASS_2813
  93             && Client_Type(Client) != CLIENT_UNKNOWNSERVER
  94             && Client_Type(Client) != CLIENT_SERVER
  95             && Client_Type(Client) != CLIENT_SERVICE) {
  96                 LogDebug("Ignored ERROR command from \"%s\" ...",
  97                          Client_Mask(Client));
  98                 IRC_SetPenalty(Client, 2);
  99                 return CONNECTED;
 100         }
 101
 102         if (Req->argc < 1)
 103                 Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
 104                     Client_Mask(Client));
 105         else
 106                 Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
 107                     Client_Mask(Client), Req->argv[0]);
 108
 109         return CONNECTED;
 110 } /* IRC_ERROR */
 111
 112 /**
 113  * Handler for the IRC "KILL" command.
 114  *
 115  * This function implements the IRC command "KILL" which is used to selectively
 116  * disconnect clients. It can be used by IRC operators and servers, for example
 117  * to "solve" nick collisions after netsplits. See RFC 2812 section 3.7.1.
 118  *
 119  * Please note that this function is also called internally, without a real
 120  * KILL command being received over the network! Client is Client_ThisServer()
 121  * in this case, and the prefix in Req is NULL.
 122  *
 123  * @param Client The client from which this command has been received or
 124  * Client_ThisServer() when generated interanlly.
 125  * @param Req Request structure with prefix and all parameters.
 126  * @return CONNECTED or DISCONNECTED.
 127  */
 128 GLOBAL bool
 129 IRC_KILL(CLIENT *Client, REQUEST *Req)
 130 {
 131         CLIENT *prefix;
 132         char reason[COMMAND_LEN];
 133
 134         assert (Client != NULL);
 135         assert (Req != NULL);
 136
 137         if (Client_Type(Client) != CLIENT_SERVER && !Op_Check(Client, Req))
 138                 return Op_NoPrivileges(Client, Req);
 139
 140         /* Get prefix (origin); use the client if no prefix is given. */
 141         if (Req->prefix)
 142                 prefix = Client_Search(Req->prefix);
 143         else
 144                 prefix = Client;
 145
 146         /* Log a warning message and use this server as origin when the
 147          * prefix (origin) is invalid. And this is the reason why we don't
 148          * use the _IRC_GET_SENDER_OR_RETURN_ macro above! */
 149         if (!prefix) {
 150                 Log(LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
 151                     Req->prefix );
 152                 prefix = Client_ThisServer();
 153         }
 154
 155         if (Client != Client_ThisServer())
 156                 Log(LOG_NOTICE|LOG_snotice,
 157                     "Got KILL command from \"%s\" for \"%s\": \"%s\".",
 158                     Client_Mask(prefix), Req->argv[0], Req->argv[1]);
 159
 160         /* Build reason string: Prefix the "reason" if the originator is a
 161          * regular user, so users can't spoof KILLs of servers. */
 162         if (Client_Type(Client) == CLIENT_USER)
 163                 snprintf(reason, sizeof(reason), "KILLed by %s: %s",
 164                          Client_ID(Client), Req->argv[1]);
 165         else
 166                 strlcpy(reason, Req->argv[1], sizeof(reason));
 167
 168         return IRC_KillClient(Client, prefix, Req->argv[0], reason);
 169 }
 170
 171 /**
 172  * Handler for the IRC "NOTICE" command.
 173  *
 174  * @param Client The client from which this command has been received.
 175  * @param Req Request structure with prefix and all parameters.
 176  * @return CONNECTED or DISCONNECTED.
 177 */
 178 GLOBAL bool
 179 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 180 {
 181         return Send_Message(Client, Req, CLIENT_USER, false);
 182 } /* IRC_NOTICE */
 183
 184 /**
 185  * Handler for the IRC "PRIVMSG" command.
 186  *
 187  * @param Client The client from which this command has been received.
 188  * @param Req Request structure with prefix and all parameters.
 189  * @return CONNECTED or DISCONNECTED.
 190  */
 191 GLOBAL bool
 192 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 193 {
 194         return Send_Message(Client, Req, CLIENT_USER, true);
 195 } /* IRC_PRIVMSG */
 196
 197 /**
 198  * Handler for the IRC "SQUERY" command.
 199  *
 200  * @param Client The client from which this command has been received.
 201  * @param Req Request structure with prefix and all parameters.
 202  * @return CONNECTED or DISCONNECTED.
 203  */
 204 GLOBAL bool
 205 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 206 {
 207         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 208 } /* IRC_SQUERY */
 209
 210 /*
 211  * Handler for the IRC "TRACE" command.
 212  *
 213  * @param Client The client from which this command has been received.
 214  * @param Req Request structure with prefix and all parameters.
 215  * @return CONNECTED or DISCONNECTED.
 216  */
 217  GLOBAL bool
 218 IRC_TRACE(CLIENT *Client, REQUEST *Req)
 219 {
 220         CLIENT *from, *target, *c;
 221         CONN_ID idx, idx2;
 222         char user[CLIENT_USER_LEN];
 223
 224         assert(Client != NULL);
 225         assert(Req != NULL);
 226
 227         IRC_SetPenalty(Client, 3);
 228
 229         _IRC_GET_SENDER_OR_RETURN_(from, Req, Client)
 230         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
 231
 232         /* Forward command to other server? */
 233         if (target != Client_ThisServer()) {
 234                 /* Send RPL_TRACELINK back to initiator */
 235                 idx = Client_Conn(Client);
 236                 assert(idx > NONE);
 237                 idx2 = Client_Conn(Client_NextHop(target));
 238                 assert(idx2 > NONE);
 239
 240                 if (!IRC_WriteStrClient(from, RPL_TRACELINK_MSG,
 241                                         Client_ID(from), PACKAGE_NAME,
 242                                         PACKAGE_VERSION, Client_ID(target),
 243                                         Client_ID(Client_NextHop(target)),
 244                                         Option_String(idx2),
 245                                         time(NULL) - Conn_StartTime(idx2),
 246                                         Conn_SendQ(idx), Conn_SendQ(idx2)))
 247                         return DISCONNECTED;
 248
 249                 /* Forward command */
 250                 IRC_WriteStrClientPrefix(target, from, "TRACE %s", Req->argv[0]);
 251                 return CONNECTED;
 252         }
 253
 254         /* Infos about all connected servers */
 255         c = Client_First();
 256         while (c) {
 257                 if (Client_Conn(c) > NONE) {
 258                         /* Local client */
 259                         if (Client_Type(c) == CLIENT_SERVER) {
 260                                 /* Server link */
 261                                 strlcpy(user, Client_User(c), sizeof(user));
 262                                 if (user[0] == '~')
 263                                         strlcpy(user, "unknown", sizeof(user));
 264                                 if (!IRC_WriteStrClient(from,
 265                                                 RPL_TRACESERVER_MSG,
 266                                                 Client_ID(from), Client_ID(c),
 267                                                 user, Client_Hostname(c),
 268                                                 Client_Mask(Client_ThisServer()),
 269                                                 Option_String(Client_Conn(c))))
 270                                         return DISCONNECTED;
 271                         }
 272                         if (Client_Type(c) == CLIENT_USER
 273                             && Client_HasMode(c, 'o')) {
 274                                 /* IRC Operator */
 275                                 if (!IRC_WriteStrClient(from,
 276                                                 RPL_TRACEOPERATOR_MSG,
 277                                                 Client_ID(from), Client_ID(c)))
 278                                         return DISCONNECTED;
 279                         }
 280                 }
 281                 c = Client_Next( c );
 282         }
 283
 284         return IRC_WriteStrClient(from, RPL_TRACEEND_MSG, Client_ID(from),
 285                                   Conf_ServerName, PACKAGE_NAME,
 286                                   PACKAGE_VERSION, NGIRCd_DebugLevel);
 287 } /* IRC_TRACE */
 288
 289 /**
 290  * Handler for the IRC "HELP" command.
 291  *
 292  * @param Client The client from which this command has been received.
 293  * @param Req Request structure with prefix and all parameters.
 294  * @return CONNECTED or DISCONNECTED.
 295  */
 296 GLOBAL bool
 297 IRC_HELP(CLIENT *Client, REQUEST *Req)
 298 {
 299         COMMAND *cmd;
 300
 301         assert(Client != NULL);
 302         assert(Req != NULL);
 303
 304         IRC_SetPenalty(Client, 2);
 305
 306         if ((Req->argc == 0 && array_bytes(&Conf_Helptext) > 0)
 307             || (Req->argc >= 1 && strcasecmp(Req->argv[0], "Commands") != 0)) {
 308                 /* Help text available and requested */
 309                 if (Req->argc >= 1)
 310                         return Help(Client, Req->argv[0]);
 311
 312                 if (!Help(Client, "Intro"))
 313                         return DISCONNECTED;
 314                 return CONNECTED;
 315         }
 316
 317         cmd = Parse_GetCommandStruct();
 318         while(cmd->name) {
 319                 if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 320                                         Client_ID(Client), cmd->name))
 321                         return DISCONNECTED;
 322                 cmd++;
 323         }
 324         return CONNECTED;
 325 } /* IRC_HELP */
 326
 327 /**
 328  * Kill an client identified by its nick name.
 329  *
 330  * Please note that after killig a client, its CLIENT cond CONNECTION
 331  * structures are invalid. So the caller must make sure on its own not to
 332  * access data of probably killed clients after calling this function!
 333  *
 334  * @param Client The client from which the command leading to the KILL has
 335  *              been received, or NULL. The KILL will no be forwarded in this
 336  *              direction. Only relevant when From is set, too.
 337  * @param From The client from which the command originated, or NULL for
 338                 the local server.
 339  * @param Nick The nick name to kill.
 340  * @param Reason Text to send as reason to the client and other servers.
 341  */
 342 GLOBAL bool
 343 IRC_KillClient(CLIENT *Client, CLIENT *From, const char *Nick, const char *Reason)
 344 {
 345         const char *msg;
 346         CONN_ID my_conn, conn;
 347         CLIENT *c;
 348
 349         /* Do we know such a client in the network? */
 350         c = Client_Search(Nick);
 351         if (!c) {
 352                 LogDebug("Client with nick \"%s\" is unknown, not forwaring.", Nick);
 353                 return CONNECTED;
 354         }
 355
 356         /* Inform other servers */
 357         IRC_WriteStrServersPrefix(From ? Client : NULL,
 358                                   From ? From : Client_ThisServer(),
 359                                   "KILL %s :%s", Nick, Reason);
 360
 361         if (Client_Type(c) != CLIENT_USER && Client_Type(c) != CLIENT_GOTNICK) {
 362                 /* Target of this KILL is not a regular user, this is
 363                  * invalid! So we ignore this case if we received a
 364                  * regular KILL from the network and try to kill the
 365                  * client/connection anyway (but log an error!) if the
 366                  * origin is the local server. */
 367
 368                 if (Client != Client_ThisServer()) {
 369                         /* Invalid KILL received from remote */
 370                         if (Client_Type(c) == CLIENT_SERVER)
 371                                 msg = ERR_CANTKILLSERVER_MSG;
 372                         else
 373                                 msg = ERR_NOPRIVILEGES_MSG;
 374                         return IRC_WriteErrClient(Client, msg, Client_ID(Client));
 375                 }
 376
 377                 Log(LOG_ERR,
 378                     "Got KILL for invalid client type: %d, \"%s\"!",
 379                     Client_Type(c), Nick);
 380         }
 381
 382         /* Save ID of this connection */
 383         my_conn = Client_Conn(Client);
 384
 385         /* Kill the client NOW:
 386          *  - Close the local connection (if there is one),
 387          *  - Destroy the CLIENT structure for remote clients.
 388          * Note: Conn_Close() removes the CLIENT structure as well. */
 389         conn = Client_Conn(c);
 390         if(conn > NONE)
 391                 Conn_Close(conn, NULL, Reason, true);
 392         else
 393                 Client_Destroy(c, NULL, Reason, false);
 394
 395         /* Are we still connected or were we killed, too? */
 396         if (my_conn > NONE && Conn_GetClient(my_conn))
 397                 return CONNECTED;
 398         else
 399                 return DISCONNECTED;
 400 }
 401
 402 /**
 403  * Send help for a given topic to the client.
 404  *
 405  * @param Client The client requesting help.
 406  * @param Topoc The help topic requested.
 407  * @return CONNECTED or DISCONNECTED.
 408  */
 409 static bool
 410 Help(CLIENT *Client, const char *Topic)
 411 {
 412         char *line;
 413         size_t helptext_len, len_str, idx_start, lines = 0;
 414         bool in_article = false;
 415
 416         assert(Client != NULL);
 417         assert(Topic != NULL);
 418
 419         helptext_len = array_bytes(&Conf_Helptext);
 420         line = array_start(&Conf_Helptext);
 421         while (helptext_len > 0) {
 422                 len_str = strlen(line) + 1;
 423                 assert(helptext_len >= len_str);
 424                 helptext_len -= len_str;
 425
 426                 if (in_article) {
 427                         /* The first character in each article text line must
 428                          * be a TAB (ASCII 9) character which will be stripped
 429                          * in the output. If it is not a TAB, the end of the
 430                          * article has been reached. */
 431                         if (line[0] != '\t') {
 432                                 if (lines > 0)
 433                                         return CONNECTED;
 434                                 else
 435                                         break;
 436                         }
 437
 438                         /* A single '.' character indicates an empty line */
 439                         if (line[1] == '.' && line[2] == '\0')
 440                                 idx_start = 2;
 441                         else
 442                                 idx_start = 1;
 443
 444                         if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 445                                                 Client_ID(Client),
 446                                                 &line[idx_start]))
 447                                 return DISCONNECTED;
 448                         lines++;
 449
 450                 } else {
 451                         if (line[0] == '-' && line[1] == ' '
 452                             && strcasecmp(&line[2], Topic) == 0)
 453                                 in_article = true;
 454                 }
 455
 456                 line += len_str;
 457         }
 458
 459         /* Help topic not found (or empty)! */
 460         if (!IRC_WriteStrClient(Client, "NOTICE %s :No help for \"%s\" found!",
 461                                 Client_ID(Client), Topic))
 462                 return DISCONNECTED;
 463
 464         return CONNECTED;
 465 }
 466
 467 /**
 468  * Get pointer to a static string representing the connection "options".
 469  *
 470  * @param Idx Connection index.
 471  * @return Pointer to static (global) string buffer.
 472  */
 473 static char *
 474 #ifdef ZLIB
 475 Option_String(CONN_ID Idx)
 476 #else
 477 Option_String(UNUSED CONN_ID Idx)
 478 #endif
 479 {
 480         static char option_txt[8];
 481 #ifdef ZLIB
 482         UINT16 options;
 483 #endif
 484
 485         assert(Idx != NONE);
 486
 487         options = Conn_Options(Idx);
 488         strcpy(option_txt, "F");        /* No idea what this means, but the
 489                                          * original ircd sends it ... */
 490 #ifdef SSL_SUPPORT
 491         if(options & CONN_SSL)          /* SSL encrypted link */
 492                 strlcat(option_txt, "s", sizeof(option_txt));
 493 #endif
 494 #ifdef ZLIB
 495         if(options & CONN_ZIP)          /* zlib compression enabled */
 496                 strlcat(option_txt, "z", sizeof(option_txt));
 497 #endif
 498         LogDebug(" *** %d: %d = %s", Idx, options, option_txt);
 499
 500         return option_txt;
 501 } /* Option_String */
 502
 503 static bool
 504 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 505 {
 506         CLIENT *cl, *from;
 507         CL2CHAN *cl2chan;
 508         CHANNEL *chan;
 509         char *currentTarget = Req->argv[0];
 510         char *lastCurrentTarget = NULL;
 511         char *message = NULL;
 512
 513         assert(Client != NULL);
 514         assert(Req != NULL);
 515
 516         if (Req->argc == 0) {
 517                 if (!SendErrors)
 518                         return CONNECTED;
 519                 return IRC_WriteErrClient(Client, ERR_NORECIPIENT_MSG,
 520                                           Client_ID(Client), Req->command);
 521         }
 522         if (Req->argc == 1) {
 523                 if (!SendErrors)
 524                         return CONNECTED;
 525                 return IRC_WriteErrClient(Client, ERR_NOTEXTTOSEND_MSG,
 526                                           Client_ID(Client));
 527         }
 528         if (Req->argc > 2) {
 529                 if (!SendErrors)
 530                         return CONNECTED;
 531                 IRC_SetPenalty(Client, 2);
 532                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 533                                           Client_ID(Client), Req->command);
 534         }
 535
 536         if (Client_Type(Client) == CLIENT_SERVER)
 537                 from = Client_Search(Req->prefix);
 538         else
 539                 from = Client;
 540         if (!from)
 541                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 542                                           Client_ID(Client), Req->prefix);
 543
 544 #ifdef ICONV
 545         if (Client_Conn(Client) > NONE)
 546                 message = Conn_EncodingFrom(Client_Conn(Client), Req->argv[1]);
 547         else
 548 #endif
 549                 message = Req->argv[1];
 550
 551         /* handle msgtarget = msgto *("," msgto) */
 552         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 553         ngt_UpperStr(Req->command);
 554
 555         while (currentTarget) {
 556                 /* Check for and handle valid <msgto> of form:
 557                  * RFC 2812 2.3.1:
 558                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 559                  *   msgto =/ ( user "%" host ) / targetmask
 560                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 561                  */
 562                 if (strchr(currentTarget, '!') == NULL)
 563                         /* nickname */
 564                         cl = Client_Search(currentTarget);
 565                 else
 566                         cl = NULL;
 567
 568                 if (cl == NULL) {
 569                         /* If currentTarget isn't a nickname check for:
 570                          * user ["%" host] "@" servername
 571                          * user "%" host
 572                          * nickname "!" user "@" host
 573                          */
 574                         char target[COMMAND_LEN];
 575                         char * nick = NULL;
 576                         char * user = NULL;
 577                         char * host = NULL;
 578                         char * server = NULL;
 579
 580                         strlcpy(target, currentTarget, COMMAND_LEN);
 581                         server = strchr(target, '@');
 582                         if (server) {
 583                                 *server = '\0';
 584                                 server++;
 585                         }
 586                         host = strchr(target, '%');
 587                         if (host) {
 588                                 *host = '\0';
 589                                 host++;
 590                         }
 591                         user = strchr(target, '!');
 592                         if (user) {
 593                                 /* msgto form: nick!user@host */
 594                                 *user = '\0';
 595                                 user++;
 596                                 nick = target;
 597                                 host = server; /* not "@server" but "@host" */
 598                         } else {
 599                                 user = target;
 600                         }
 601
 602                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 603                                 if (Client_Type(cl) != CLIENT_USER &&
 604                                     Client_Type(cl) != CLIENT_SERVICE)
 605                                         continue;
 606                                 if (nick != NULL && host != NULL) {
 607                                         if (strcasecmp(nick, Client_ID(cl)) == 0 &&
 608                                             strcasecmp(user, Client_User(cl)) == 0 &&
 609                                             strcasecmp(host, Client_HostnameDisplayed(cl)) == 0)
 610                                                 break;
 611                                         else
 612                                                 continue;
 613                                 }
 614                                 if (strcasecmp(user, Client_User(cl)) != 0)
 615                                         continue;
 616                                 if (host != NULL && strcasecmp(host,
 617                                                 Client_HostnameDisplayed(cl)) != 0)
 618                                         continue;
 619                                 if (server != NULL && strcasecmp(server,
 620                                                 Client_ID(Client_Introducer(cl))) != 0)
 621                                         continue;
 622                                 break;
 623                         }
 624                 }
 625
 626                 if (cl) {
 627                         /* Target is a user, enforce type */
 628 #ifndef STRICT_RFC
 629                         if (Client_Type(cl) != ForceType &&
 630                             !(ForceType == CLIENT_USER &&
 631                               (Client_Type(cl) == CLIENT_USER ||
 632                                Client_Type(cl) == CLIENT_SERVICE))) {
 633 #else
 634                         if (Client_Type(cl) != ForceType) {
 635 #endif
 636                                 if (SendErrors && !IRC_WriteErrClient(
 637                                     from, ERR_NOSUCHNICK_MSG,Client_ID(from),
 638                                     currentTarget))
 639                                         return DISCONNECTED;
 640                                 goto send_next_target;
 641                         }
 642
 643 #ifndef STRICT_RFC
 644                         if (ForceType == CLIENT_SERVICE &&
 645                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 646                              & CONN_RFC1459)) {
 647                                 /* SQUERY command but RFC 1459 link: convert
 648                                  * request to PRIVMSG command */
 649                                 Req->command = "PRIVMSG";
 650                         }
 651 #endif
 652                         if (Client_HasMode(cl, 'b') &&
 653                             !Client_HasMode(from, 'R') &&
 654                             !Client_HasMode(from, 'o') &&
 655                             !(Client_Type(from) == CLIENT_SERVER) &&
 656                             !(Client_Type(from) == CLIENT_SERVICE)) {
 657                                 if (SendErrors && !IRC_WriteErrClient(from,
 658                                                 ERR_NONONREG_MSG,
 659                                                 Client_ID(from), Client_ID(cl)))
 660                                         return DISCONNECTED;
 661                                 goto send_next_target;
 662                         }
 663
 664                         if (Client_HasMode(cl, 'C')) {
 665                                 cl2chan = Channel_FirstChannelOf(cl);
 666                                 while (cl2chan) {
 667                                         chan = Channel_GetChannel(cl2chan);
 668                                         if (Channel_IsMemberOf(chan, from))
 669                                                 break;
 670                                         cl2chan = Channel_NextChannelOf(cl, cl2chan);
 671                                 }
 672                                 if (!cl2chan) {
 673                                         if (SendErrors && !IRC_WriteErrClient(
 674                                             from, ERR_NOTONSAMECHANNEL_MSG,
 675                                             Client_ID(from), Client_ID(cl)))
 676                                                 return DISCONNECTED;
 677                                         goto send_next_target;
 678                                 }
 679                         }
 680
 681                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 682                             && Client_HasMode(cl, 'a')) {
 683                                 /* Target is away */
 684                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 685                                                         Client_ID(from),
 686                                                         Client_ID(cl),
 687                                                         Client_Away(cl)))
 688                                         return DISCONNECTED;
 689                         }
 690                         if (Client_Conn(from) > NONE) {
 691                                 Conn_UpdateIdle(Client_Conn(from));
 692                         }
 693                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 694                                                       Req->command, Client_ID(cl),
 695                                                       message))
 696                                 return DISCONNECTED;
 697                 } else if (ForceType != CLIENT_SERVICE
 698                            && (chan = Channel_Search(currentTarget))) {
 699                         if (!Channel_Write(chan, from, Client, Req->command,
 700                                            SendErrors, message))
 701                                         return DISCONNECTED;
 702                 } else if (ForceType != CLIENT_SERVICE
 703                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 704                            && strchr("$#", currentTarget[0])
 705                            && strchr(currentTarget, '.')) {
 706                         /* targetmask */
 707                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 708                                                message, SendErrors))
 709                                 return DISCONNECTED;
 710                 } else {
 711                         if (!SendErrors)
 712                                 return CONNECTED;
 713                         if (!IRC_WriteErrClient(from, ERR_NOSUCHNICK_MSG,
 714                                                 Client_ID(from), currentTarget))
 715                                 return DISCONNECTED;
 716                 }
 717
 718         send_next_target:
 719                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 720                 if (currentTarget)
 721                         Conn_SetPenalty(Client_Conn(Client), 1);
 722         }
 723
 724         return CONNECTED;
 725 } /* Send_Message */
 726
 727 static bool
 728 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 729                   char * message, bool SendErrors)
 730 {
 731         CLIENT *cl;
 732         bool client_match;
 733         char *mask = targetMask + 1;
 734         const char *check_wildcards;
 735
 736         cl = NULL;
 737
 738         if (!Client_HasMode(from, 'o')) {
 739                 if (!SendErrors)
 740                         return true;
 741                 return IRC_WriteErrClient(from, ERR_NOPRIVILEGES_MSG,
 742                                           Client_ID(from));
 743         }
 744
 745         /*
 746          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 747          * dot (".") and no wildcards ("*", "?") following the last one.
 748          */
 749         check_wildcards = strrchr(targetMask, '.');
 750         assert(check_wildcards != NULL);
 751         if (check_wildcards &&
 752                 check_wildcards[strcspn(check_wildcards, "*?")])
 753         {
 754                 if (!SendErrors)
 755                         return true;
 756                 return IRC_WriteErrClient(from, ERR_WILDTOPLEVEL, targetMask);
 757         }
 758
 759         /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 760         if (targetMask[0] == '#') {
 761                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 762                         if (Client_Type(cl) != CLIENT_USER)
 763                                 continue;
 764                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 765                         if (client_match)
 766                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 767                                                 command, Client_ID(cl), message))
 768                                         return false;
 769                 }
 770         } else {
 771                 assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
 772                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 773                         if (Client_Type(cl) != CLIENT_USER)
 774                                 continue;
 775                         client_match = MatchCaseInsensitive(mask,
 776                                         Client_ID(Client_Introducer(cl)));
 777                         if (client_match)
 778                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 779                                                 command, Client_ID(cl), message))
 780                                         return false;
 781                 }
 782         }
 783         return CONNECTED;
 784 } /* Send_Message_Mask */
 785
 786 /* -eof- */