src/ngircd/irc.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2015 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 #include <strings.h>
  23 #include <time.h>
  24
  25 #include "ngircd.h"
  26 #include "conn-func.h"
  27 #include "conf.h"
  28 #include "channel.h"
  29 #ifdef ICONV
  30 # include "conn-encoding.h"
  31 #endif
  32 #include "irc-macros.h"
  33 #include "irc-write.h"
  34 #include "log.h"
  35 #include "match.h"
  36 #include "messages.h"
  37 #include "parse.h"
  38 #include "op.h"
  39
  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_GET_SENDER_OR_RETURN_(from, Req, Client)
 228         _IRC_GET_TARGET_SERVER_OR_RETURN_(target, Req, 0, from)
 229
 230         /* Forward command to other server? */
 231         if (target != Client_ThisServer()) {
 232                 /* Send RPL_TRACELINK back to initiator */
 233                 idx = Client_Conn(Client);
 234                 assert(idx > NONE);
 235                 idx2 = Client_Conn(Client_NextHop(target));
 236                 assert(idx2 > NONE);
 237
 238                 if (!IRC_WriteStrClient(from, RPL_TRACELINK_MSG,
 239                                         Client_ID(from), PACKAGE_NAME,
 240                                         PACKAGE_VERSION, Client_ID(target),
 241                                         Client_ID(Client_NextHop(target)),
 242                                         Option_String(idx2),
 243                                         (long)(time(NULL) - Conn_StartTime(idx2)),
 244                                         Conn_SendQ(idx), Conn_SendQ(idx2)))
 245                         return DISCONNECTED;
 246
 247                 /* Forward command */
 248                 IRC_WriteStrClientPrefix(target, from, "TRACE %s", Req->argv[0]);
 249                 return CONNECTED;
 250         }
 251
 252         /* Infos about all connected servers */
 253         c = Client_First();
 254         while (c) {
 255                 if (Client_Conn(c) > NONE) {
 256                         /* Local client */
 257                         if (Client_Type(c) == CLIENT_SERVER) {
 258                                 /* Server link */
 259                                 strlcpy(user, Client_User(c), sizeof(user));
 260                                 if (user[0] == '~')
 261                                         strlcpy(user, "unknown", sizeof(user));
 262                                 if (!IRC_WriteStrClient(from,
 263                                                 RPL_TRACESERVER_MSG,
 264                                                 Client_ID(from), Client_ID(c),
 265                                                 user, Client_Hostname(c),
 266                                                 Client_Mask(Client_ThisServer()),
 267                                                 Option_String(Client_Conn(c))))
 268                                         return DISCONNECTED;
 269                         }
 270                         if (Client_Type(c) == CLIENT_USER
 271                             && Client_HasMode(c, 'o')) {
 272                                 /* IRC Operator */
 273                                 if (!IRC_WriteStrClient(from,
 274                                                 RPL_TRACEOPERATOR_MSG,
 275                                                 Client_ID(from), Client_ID(c)))
 276                                         return DISCONNECTED;
 277                         }
 278                 }
 279                 c = Client_Next( c );
 280         }
 281
 282         return IRC_WriteStrClient(from, RPL_TRACEEND_MSG, Client_ID(from),
 283                                   Conf_ServerName, PACKAGE_NAME,
 284                                   PACKAGE_VERSION, NGIRCd_DebugLevel);
 285 } /* IRC_TRACE */
 286
 287 /**
 288  * Handler for the IRC "HELP" command.
 289  *
 290  * @param Client The client from which this command has been received.
 291  * @param Req Request structure with prefix and all parameters.
 292  * @return CONNECTED or DISCONNECTED.
 293  */
 294 GLOBAL bool
 295 IRC_HELP(CLIENT *Client, REQUEST *Req)
 296 {
 297         COMMAND *cmd;
 298
 299         assert(Client != NULL);
 300         assert(Req != NULL);
 301
 302         if ((Req->argc == 0 && array_bytes(&Conf_Helptext) > 0)
 303             || (Req->argc >= 1 && strcasecmp(Req->argv[0], "Commands") != 0)) {
 304                 /* Help text available and requested */
 305                 if (Req->argc >= 1)
 306                         return Help(Client, Req->argv[0]);
 307
 308                 if (!Help(Client, "Intro"))
 309                         return DISCONNECTED;
 310                 return CONNECTED;
 311         }
 312
 313         cmd = Parse_GetCommandStruct();
 314         while(cmd->name) {
 315                 if (!IRC_WriteStrClient(Client, "NOTICE %s :%s",
 316                                         Client_ID(Client), cmd->name))
 317                         return DISCONNECTED;
 318                 cmd++;
 319         }
 320         return CONNECTED;
 321 } /* IRC_HELP */
 322
 323 /**
 324  * Kill an client identified by its nick name.
 325  *
 326  * Please note that after killig a client, its CLIENT cond CONNECTION
 327  * structures are invalid. So the caller must make sure on its own not to
 328  * access data of probably killed clients after calling this function!
 329  *
 330  * @param Client The client from which the command leading to the KILL has
 331  *              been received, or NULL. The KILL will no be forwarded in this
 332  *              direction. Only relevant when From is set, too.
 333  * @param From The client from which the command originated, or NULL for
 334                 the local server.
 335  * @param Nick The nick name to kill.
 336  * @param Reason Text to send as reason to the client and other servers.
 337  */
 338 GLOBAL bool
 339 IRC_KillClient(CLIENT *Client, CLIENT *From, const char *Nick, const char *Reason)
 340 {
 341         const char *msg;
 342         CONN_ID my_conn = NONE, conn;
 343         CLIENT *c;
 344
 345         assert(Nick != NULL);
 346         assert(Reason != NULL);
 347
 348         /* Do we know such a client in the network? */
 349         c = Client_Search(Nick);
 350         if (!c) {
 351                 LogDebug("Client with nick \"%s\" is unknown, not forwaring.", Nick);
 352                 return CONNECTED;
 353         }
 354
 355         /* Inform other servers */
 356         IRC_WriteStrServersPrefix(From ? Client : NULL,
 357                                   From ? From : Client_ThisServer(),
 358                                   "KILL %s :%s", Nick, Reason);
 359
 360         if (Client_Type(c) != CLIENT_USER && Client_Type(c) != CLIENT_GOTNICK) {
 361                 /* Target of this KILL is not a regular user, this is
 362                  * invalid! So we ignore this case if we received a
 363                  * regular KILL from the network and try to kill the
 364                  * client/connection anyway (but log an error!) if the
 365                  * origin is the local server. */
 366
 367                 if (Client != Client_ThisServer()) {
 368                         /* Invalid KILL received from remote */
 369                         if (Client_Type(c) == CLIENT_SERVER)
 370                                 msg = ERR_CANTKILLSERVER_MSG;
 371                         else
 372                                 msg = ERR_NOPRIVILEGES_MSG;
 373                         return IRC_WriteErrClient(Client, msg, Client_ID(Client));
 374                 }
 375
 376                 Log(LOG_ERR,
 377                     "Got KILL for invalid client type: %d, \"%s\"!",
 378                     Client_Type(c), Nick);
 379         }
 380
 381         /* Save ID of this connection */
 382         if (Client)
 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         UINT16 options;
 482
 483         assert(Idx != NONE);
 484
 485         options = Conn_Options(Idx);
 486         strcpy(option_txt, "F");        /* No idea what this means, but the
 487                                          * original ircd sends it ... */
 488 #ifdef SSL_SUPPORT
 489         if(options & CONN_SSL)          /* SSL encrypted link */
 490                 strlcat(option_txt, "s", sizeof(option_txt));
 491 #endif
 492 #ifdef ZLIB
 493         if(options & CONN_ZIP)          /* zlib compression enabled */
 494                 strlcat(option_txt, "z", sizeof(option_txt));
 495 #endif
 496         LogDebug(" *** %d: %d = %s", Idx, options, option_txt);
 497
 498         return option_txt;
 499 } /* Option_String */
 500
 501 /**
 502  * Send a message to target(s).
 503  *
 504  * This function is used by IRC_{PRIVMSG|NOTICE|SQUERY} to actualy
 505  * send the message(s).
 506  *
 507  * @param Client The client from which this command has been received.
 508  * @param Req Request structure with prefix and all parameters.
 509  * @param ForceType Required type of the destination of the message(s).
 510  * @param SendErrors Whether to report errors back to the client or not.
 511  * @return CONNECTED or DISCONNECTED.
 512  */
 513 static bool
 514 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 515 {
 516         CLIENT *cl, *from;
 517         CL2CHAN *cl2chan;
 518         CHANNEL *chan;
 519         char *currentTarget = Req->argv[0];
 520         char *lastCurrentTarget = NULL;
 521         char *message = NULL;
 522
 523         assert(Client != NULL);
 524         assert(Req != NULL);
 525
 526         if (Req->argc == 0) {
 527                 if (!SendErrors)
 528                         return CONNECTED;
 529                 return IRC_WriteErrClient(Client, ERR_NORECIPIENT_MSG,
 530                                           Client_ID(Client), Req->command);
 531         }
 532         if (Req->argc == 1) {
 533                 if (!SendErrors)
 534                         return CONNECTED;
 535                 return IRC_WriteErrClient(Client, ERR_NOTEXTTOSEND_MSG,
 536                                           Client_ID(Client));
 537         }
 538         if (Req->argc > 2) {
 539                 if (!SendErrors)
 540                         return CONNECTED;
 541                 return IRC_WriteErrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 542                                           Client_ID(Client), Req->command);
 543         }
 544
 545         if (Client_Type(Client) == CLIENT_SERVER && Req->prefix)
 546                 from = Client_Search(Req->prefix);
 547         else
 548                 from = Client;
 549         if (!from)
 550                 return IRC_WriteErrClient(Client, ERR_NOSUCHNICK_MSG,
 551                                           Client_ID(Client), Req->prefix);
 552
 553 #ifdef ICONV
 554         if (Client_Conn(Client) > NONE)
 555                 message = Conn_EncodingFrom(Client_Conn(Client), Req->argv[1]);
 556         else
 557 #endif
 558                 message = Req->argv[1];
 559
 560         /* handle msgtarget = msgto *("," msgto) */
 561         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 562         ngt_UpperStr(Req->command);
 563
 564         while (currentTarget) {
 565                 /* Check for and handle valid <msgto> of form:
 566                  * RFC 2812 2.3.1:
 567                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 568                  *   msgto =/ ( user "%" host ) / targetmask
 569                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 570                  */
 571                 if (strchr(currentTarget, '!') == NULL)
 572                         /* nickname */
 573                         cl = Client_Search(currentTarget);
 574                 else
 575                         cl = NULL;
 576
 577                 if (cl == NULL) {
 578                         /* If currentTarget isn't a nickname check for:
 579                          * user ["%" host] "@" servername
 580                          * user "%" host
 581                          * nickname "!" user "@" host
 582                          */
 583                         char target[COMMAND_LEN];
 584                         char * nick = NULL;
 585                         char * user = NULL;
 586                         char * host = NULL;
 587                         char * server = NULL;
 588
 589                         strlcpy(target, currentTarget, COMMAND_LEN);
 590                         server = strchr(target, '@');
 591                         if (server) {
 592                                 *server = '\0';
 593                                 server++;
 594                         }
 595                         host = strchr(target, '%');
 596                         if (host) {
 597                                 *host = '\0';
 598                                 host++;
 599                         }
 600                         user = strchr(target, '!');
 601                         if (user) {
 602                                 /* msgto form: nick!user@host */
 603                                 *user = '\0';
 604                                 user++;
 605                                 nick = target;
 606                                 host = server; /* not "@server" but "@host" */
 607                         } else {
 608                                 user = target;
 609                         }
 610
 611                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 612                                 if (Client_Type(cl) != CLIENT_USER &&
 613                                     Client_Type(cl) != CLIENT_SERVICE)
 614                                         continue;
 615                                 if (nick != NULL && host != NULL) {
 616                                         if (strcasecmp(nick, Client_ID(cl)) == 0 &&
 617                                             strcasecmp(user, Client_User(cl)) == 0 &&
 618                                             strcasecmp(host, Client_HostnameDisplayed(cl)) == 0)
 619                                                 break;
 620                                         else
 621                                                 continue;
 622                                 }
 623                                 if (strcasecmp(user, Client_User(cl)) != 0)
 624                                         continue;
 625                                 if (host != NULL && strcasecmp(host,
 626                                                 Client_HostnameDisplayed(cl)) != 0)
 627                                         continue;
 628                                 if (server != NULL && strcasecmp(server,
 629                                                 Client_ID(Client_Introducer(cl))) != 0)
 630                                         continue;
 631                                 break;
 632                         }
 633                 }
 634
 635                 if (cl) {
 636                         /* Target is a user, enforce type */
 637 #ifndef STRICT_RFC
 638                         if (Client_Type(cl) != ForceType &&
 639                             !(ForceType == CLIENT_USER &&
 640                               (Client_Type(cl) == CLIENT_USER ||
 641                                Client_Type(cl) == CLIENT_SERVICE))) {
 642 #else
 643                         if (Client_Type(cl) != ForceType) {
 644 #endif
 645                                 if (SendErrors && !IRC_WriteErrClient(
 646                                     from, ERR_NOSUCHNICK_MSG,Client_ID(from),
 647                                     currentTarget))
 648                                         return DISCONNECTED;
 649                                 goto send_next_target;
 650                         }
 651
 652 #ifndef STRICT_RFC
 653                         if (ForceType == CLIENT_SERVICE &&
 654                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 655                              & CONN_RFC1459)) {
 656                                 /* SQUERY command but RFC 1459 link: convert
 657                                  * request to PRIVMSG command */
 658                                 Req->command = "PRIVMSG";
 659                         }
 660 #endif
 661                         if (Client_HasMode(cl, 'b') &&
 662                             !Client_HasMode(from, 'R') &&
 663                             !Client_HasMode(from, 'o') &&
 664                             !(Client_Type(from) == CLIENT_SERVER) &&
 665                             !(Client_Type(from) == CLIENT_SERVICE)) {
 666                                 if (SendErrors && !IRC_WriteErrClient(from,
 667                                                 ERR_NONONREG_MSG,
 668                                                 Client_ID(from), Client_ID(cl)))
 669                                         return DISCONNECTED;
 670                                 goto send_next_target;
 671                         }
 672
 673                         if (Client_HasMode(cl, 'C')) {
 674                                 cl2chan = Channel_FirstChannelOf(cl);
 675                                 while (cl2chan) {
 676                                         chan = Channel_GetChannel(cl2chan);
 677                                         if (Channel_IsMemberOf(chan, from))
 678                                                 break;
 679                                         cl2chan = Channel_NextChannelOf(cl, cl2chan);
 680                                 }
 681                                 if (!cl2chan) {
 682                                         if (SendErrors && !IRC_WriteErrClient(
 683                                             from, ERR_NOTONSAMECHANNEL_MSG,
 684                                             Client_ID(from), Client_ID(cl)))
 685                                                 return DISCONNECTED;
 686                                         goto send_next_target;
 687                                 }
 688                         }
 689
 690                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 691                             && Client_HasMode(cl, 'a')) {
 692                                 /* Target is away */
 693                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 694                                                         Client_ID(from),
 695                                                         Client_ID(cl),
 696                                                         Client_Away(cl)))
 697                                         return DISCONNECTED;
 698                         }
 699                         if (Client_Conn(from) > NONE) {
 700                                 Conn_UpdateIdle(Client_Conn(from));
 701                         }
 702                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 703                                                       Req->command, Client_ID(cl),
 704                                                       message))
 705                                 return DISCONNECTED;
 706                 } else if (ForceType != CLIENT_SERVICE
 707                            && (chan = Channel_Search(currentTarget))) {
 708                         /* Target is a channel */
 709                         if (!Channel_Write(chan, from, Client, Req->command,
 710                                            SendErrors, message))
 711                                         return DISCONNECTED;
 712                 } else if (ForceType != CLIENT_SERVICE
 713                            && strchr("$#", currentTarget[0])
 714                            && strchr(currentTarget, '.')) {
 715                         /* $#: server/host mask, RFC 2812, sec. 3.3.1 */
 716                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 717                                                message, SendErrors))
 718                                 return DISCONNECTED;
 719                 } else {
 720                         if (!SendErrors)
 721                                 return CONNECTED;
 722                         if (!IRC_WriteErrClient(from, ERR_NOSUCHNICK_MSG,
 723                                                 Client_ID(from), currentTarget))
 724                                 return DISCONNECTED;
 725                 }
 726
 727         send_next_target:
 728                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 729                 if (currentTarget)
 730                         Conn_SetPenalty(Client_Conn(Client), 1);
 731         }
 732
 733         return CONNECTED;
 734 } /* Send_Message */
 735
 736 /**
 737  * Send a message to "target mask" target(s).
 738  *
 739  * See RFC 2812, sec. 3.3.1 for details.
 740  *
 741  * @param from The client from which this command has been received.
 742  * @param command The command to use (PRIVMSG, NOTICE, ...).
 743  * @param targetMask The "target mask" (will be verified by this function).
 744  * @param message The message to send.
 745  * @param SendErrors Whether to report errors back to the client or not.
 746  * @return CONNECTED or DISCONNECTED.
 747  */
 748 static bool
 749 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 750                   char * message, bool SendErrors)
 751 {
 752         CLIENT *cl;
 753         bool client_match;
 754         char *mask = targetMask + 1;
 755         const char *check_wildcards;
 756
 757         cl = NULL;
 758
 759         if (!Client_HasMode(from, 'o')) {
 760                 if (!SendErrors)
 761                         return true;
 762                 return IRC_WriteErrClient(from, ERR_NOPRIVILEGES_MSG,
 763                                           Client_ID(from));
 764         }
 765
 766         /*
 767          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 768          * dot (".") and no wildcards ("*", "?") following the last one.
 769          */
 770         check_wildcards = strrchr(targetMask, '.');
 771         if (!check_wildcards || check_wildcards[strcspn(check_wildcards, "*?")]) {
 772                 if (!SendErrors)
 773                         return true;
 774                 return IRC_WriteErrClient(from, ERR_WILDTOPLEVEL, targetMask);
 775         }
 776
 777         if (targetMask[0] == '#') {
 778                 /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 779                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 780                         if (Client_Type(cl) != CLIENT_USER)
 781                                 continue;
 782                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 783                         if (client_match)
 784                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 785                                                 command, Client_ID(cl), message))
 786                                         return false;
 787                 }
 788         } else {
 789                 /* $: server mask, see RFC 2812, sec. 3.3.1 */
 790                 assert(targetMask[0] == '$');
 791                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 792                         if (Client_Type(cl) != CLIENT_USER)
 793                                 continue;
 794                         client_match = MatchCaseInsensitive(mask,
 795                                         Client_ID(Client_Introducer(cl)));
 796                         if (client_match)
 797                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 798                                                 command, Client_ID(cl), message))
 799                                         return false;
 800                 }
 801         }
 802         return CONNECTED;
 803 } /* Send_Message_Mask */
 804
 805 /* -eof- */