src/ngircd/irc.c

   1 /*
   2  * ngIRCd -- The Next Generation IRC Daemon
   3  * Copyright (c)2001-2004 Alexander Barton <alex@barton.de>
   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
  13 #include "portab.h"
  14
  15 /**
  16  * @file
  17  * IRC commands
  18  */
  19
  20 #include "imp.h"
  21 #include <assert.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "ngircd.h"
  26 #include "conn-func.h"
  27 #include "conf.h"
  28 #include "channel.h"
  29 #include "defines.h"
  30 #include "irc-write.h"
  31 #include "log.h"
  32 #include "match.h"
  33 #include "messages.h"
  34 #include "parse.h"
  35 #include "tool.h"
  36
  37 #include "exp.h"
  38 #include "irc.h"
  39
  40
  41 static char *Option_String PARAMS((CONN_ID Idx));
  42 static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType,
  43                                  bool SendErrors));
  44 static bool Send_Message_Mask PARAMS((CLIENT *from, char *command,
  45                                       char *targetMask, char *message,
  46                                       bool SendErrors));
  47
  48
  49 GLOBAL bool
  50 IRC_ERROR( CLIENT *Client, REQUEST *Req )
  51 {
  52         assert( Client != NULL );
  53         assert( Req != NULL );
  54
  55         if (Req->argc < 1)
  56                 Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
  57                     Client_Mask(Client));
  58         else
  59                 Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
  60                     Client_Mask(Client), Req->argv[0]);
  61
  62         return CONNECTED;
  63 } /* IRC_ERROR */
  64
  65
  66 /**
  67  * Kill client on request.
  68  * This function implements the IRC command "KILL" wich is used to selectively
  69  * disconnect clients. It can be used by IRC operators and servers, for example
  70  * to "solve" nick collisions after netsplits.
  71  * Please note that this function is also called internally, without a real
  72  * KILL command being received over the network! Client is Client_ThisServer()
  73  * in this case. */
  74 GLOBAL bool
  75 IRC_KILL( CLIENT *Client, REQUEST *Req )
  76 {
  77         CLIENT *prefix, *c;
  78         char reason[COMMAND_LEN], *msg;
  79         CONN_ID my_conn, conn;
  80
  81         assert( Client != NULL );
  82         assert( Req != NULL );
  83
  84         if(( Client_Type( Client ) != CLIENT_SERVER ) &&
  85            ( ! Client_OperByMe( Client )))
  86         {
  87                 /* The originator of the KILL is neither an IRC operator of
  88                  * this server nor a server. */
  89                 return IRC_WriteStrClient( Client, ERR_NOPRIVILEGES_MSG,
  90                                            Client_ID( Client ));
  91         }
  92
  93         if( Req->argc != 2 )
  94         {
  95                 /* This command requires exactly 2 parameters! */
  96                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
  97                                            Client_ID( Client ), Req->command );
  98         }
  99
 100         if( Req->prefix ) prefix = Client_Search( Req->prefix );
 101         else prefix = Client;
 102         if( ! prefix )
 103         {
 104                 Log( LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
 105                      Req->prefix );
 106                 prefix = Client_ThisServer( );
 107         }
 108
 109         if( Client != Client_ThisServer( ))
 110         {
 111                 /* This is a "real" KILL received from the network. */
 112                 Log( LOG_NOTICE|LOG_snotice, "Got KILL command from \"%s\" for \"%s\": %s",
 113                      Client_Mask( prefix ), Req->argv[0], Req->argv[1] );
 114         }
 115
 116         /* Build reason string */
 117         if( Client_Type( Client ) == CLIENT_USER )
 118         {
 119                 /* Prefix the "reason" if the originator is a regular user,
 120                  * so users can't spoof KILLs of servers. */
 121                 snprintf( reason, sizeof( reason ), "KILLed by %s: %s",
 122                           Client_ID( Client ), Req->argv[1] );
 123         }
 124         else
 125                 strlcpy( reason, Req->argv[1], sizeof( reason ));
 126
 127         /* Inform other servers */
 128         IRC_WriteStrServersPrefix( Client, prefix, "KILL %s :%s",
 129                                    Req->argv[0], reason );
 130
 131         /* Save ID of this connection */
 132         my_conn = Client_Conn( Client );
 133
 134         /* Do we host such a client? */
 135         c = Client_Search( Req->argv[0] );
 136         if( c )
 137         {
 138                 if(( Client_Type( c ) != CLIENT_USER ) &&
 139                    ( Client_Type( c ) != CLIENT_GOTNICK ))
 140                 {
 141                         /* Target of this KILL is not a regular user, this is
 142                          * invalid! So we ignore this case if we received a
 143                          * regular KILL from the network and try to kill the
 144                          * client/connection anyway (but log an error!) if the
 145                          * origin is the local server. */
 146
 147                         if( Client != Client_ThisServer( ))
 148                         {
 149                                 /* Invalid KILL received from remote */
 150                                 if( Client_Type( c ) == CLIENT_SERVER )
 151                                         msg = ERR_CANTKILLSERVER_MSG;
 152                                 else
 153                                         msg = ERR_NOPRIVILEGES_MSG;
 154                                 return IRC_WriteStrClient( Client, msg,
 155                                         Client_ID( Client ));
 156                         }
 157
 158                         Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
 159                              Client_Type( c ), Req->argv[0] );
 160                 }
 161
 162                 /* Kill the client NOW:
 163                  *  - Close the local connection (if there is one),
 164                  *  - Destroy the CLIENT structure for remote clients.
 165                  * Note: Conn_Close() removes the CLIENT structure as well. */
 166                 conn = Client_Conn( c );
 167                 if(conn > NONE)
 168                         Conn_Close(conn, NULL, reason, true);
 169                 else
 170                         Client_Destroy(c, NULL, reason, false);
 171         }
 172         else
 173                 Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
 174
 175         /* Are we still connected or were we killed, too? */
 176         if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
 177                 return CONNECTED;
 178         else
 179                 return DISCONNECTED;
 180 } /* IRC_KILL */
 181
 182
 183 /**
 184  * Handler for the IRC command NOTICE.
 185  */
 186 GLOBAL bool
 187 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 188 {
 189         return Send_Message(Client, Req, CLIENT_USER, false);
 190 } /* IRC_NOTICE */
 191
 192
 193 /**
 194  * Handler for the IRC command PRIVMSG.
 195  */
 196 GLOBAL bool
 197 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 198 {
 199         return Send_Message(Client, Req, CLIENT_USER, true);
 200 } /* IRC_PRIVMSG */
 201
 202
 203 /**
 204  * Handler for the IRC command SQUERY.
 205  */
 206 GLOBAL bool
 207 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 208 {
 209         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 210 } /* IRC_SQUERY */
 211
 212
 213 GLOBAL bool
 214 IRC_TRACE( CLIENT *Client, REQUEST *Req )
 215 {
 216         CLIENT *from, *target, *c;
 217         CONN_ID idx, idx2;
 218         char user[CLIENT_USER_LEN];
 219
 220         assert( Client != NULL );
 221         assert( Req != NULL );
 222
 223         /* Bad number of arguments? */
 224         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 225
 226         /* Search sender */
 227         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 228         else from = Client;
 229         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 230
 231         /* Search target */
 232         if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
 233         else target = Client_ThisServer( );
 234
 235         /* Forward command to other server? */
 236         if( target != Client_ThisServer( ))
 237         {
 238                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
 239
 240                 /* Send RPL_TRACELINK back to initiator */
 241                 idx = Client_Conn( Client ); assert( idx > NONE );
 242                 idx2 = Client_Conn( Client_NextHop( target )); assert( idx2 > NONE );
 243                 if( ! IRC_WriteStrClient( from, RPL_TRACELINK_MSG, Client_ID( from ), PACKAGE_NAME, PACKAGE_VERSION, Client_ID( target ), Client_ID( Client_NextHop( target )), Option_String( idx2 ), time( NULL ) - Conn_StartTime( idx2 ), Conn_SendQ( idx ), Conn_SendQ( idx2 ))) 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         {
 254                 if( Client_Conn( c ) > NONE )
 255                 {
 256                         /* Local client */
 257                         if( Client_Type( c ) == CLIENT_SERVER )
 258                         {
 259                                 /* Server link */
 260                                 strlcpy( user, Client_User( c ), sizeof( user ));
 261                                 if( user[0] == '~' ) strlcpy( user, "unknown", sizeof( user ));
 262                                 if( ! IRC_WriteStrClient( from, RPL_TRACESERVER_MSG, Client_ID( from ), Client_ID( c ), user, Client_Hostname( c ), Client_Mask( Client_ThisServer( )), Option_String( Client_Conn( c )))) return DISCONNECTED;
 263                         }
 264                         if(( Client_Type( c ) == CLIENT_USER ) && ( strchr( Client_Modes( c ), 'o' )))
 265                         {
 266                                 /* IRC Operator */
 267                                 if( ! IRC_WriteStrClient( from, RPL_TRACEOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
 268                         }
 269                 }
 270                 c = Client_Next( c );
 271         }
 272
 273         IRC_SetPenalty( Client, 3 );
 274         return IRC_WriteStrClient( from, RPL_TRACEEND_MSG, Client_ID( from ), Conf_ServerName, PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_DebugLevel );
 275 } /* IRC_TRACE */
 276
 277
 278 GLOBAL bool
 279 IRC_HELP( CLIENT *Client, REQUEST *Req )
 280 {
 281         COMMAND *cmd;
 282
 283         assert( Client != NULL );
 284         assert( Req != NULL );
 285
 286         /* Bad number of arguments? */
 287         if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 288
 289         cmd = Parse_GetCommandStruct( );
 290         while( cmd->name )
 291         {
 292                 if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
 293                 cmd++;
 294         }
 295
 296         IRC_SetPenalty( Client, 2 );
 297         return CONNECTED;
 298 } /* IRC_HELP */
 299
 300
 301 static char *
 302 Option_String( CONN_ID Idx )
 303 {
 304         static char option_txt[8];
 305         UINT16 options;
 306
 307         options = Conn_Options(Idx);
 308
 309         strcpy(option_txt, "F");        /* No idea what this means, but the
 310                                          * original ircd sends it ... */
 311 #ifdef ZLIB
 312         if(options & CONN_ZIP)          /* zlib compression supported. */
 313                 strcat(option_txt, "z");
 314 #endif
 315
 316         return option_txt;
 317 } /* Option_String */
 318
 319
 320 static bool
 321 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 322 {
 323         CLIENT *cl, *from;
 324         CHANNEL *chan;
 325         char *currentTarget = Req->argv[0];
 326         char *lastCurrentTarget = NULL;
 327
 328         assert(Client != NULL);
 329         assert(Req != NULL);
 330
 331         if (Req->argc == 0) {
 332                 if (!SendErrors)
 333                         return CONNECTED;
 334                 return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
 335                                           Client_ID(Client), Req->command);
 336         }
 337         if (Req->argc == 1) {
 338                 if (!SendErrors)
 339                         return CONNECTED;
 340                 return IRC_WriteStrClient(Client, ERR_NOTEXTTOSEND_MSG,
 341                                           Client_ID(Client));
 342         }
 343         if (Req->argc > 2) {
 344                 if (!SendErrors)
 345                         return CONNECTED;
 346                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 347                                           Client_ID(Client), Req->command);
 348         }
 349
 350         if (Client_Type(Client) == CLIENT_SERVER)
 351                 from = Client_Search(Req->prefix);
 352         else
 353                 from = Client;
 354         if (!from)
 355                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 356                                           Client_ID(Client), Req->prefix);
 357
 358         /* handle msgtarget = msgto *("," msgto) */
 359         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 360         ngt_UpperStr(Req->command);
 361
 362         while (currentTarget) {
 363                 /* Check for and handle valid <msgto> of form:
 364                  * RFC 2812 2.3.1:
 365                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 366                  *   msgto =/ ( user "%" host ) / targetmask
 367                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 368                  */
 369                 if (strchr(currentTarget, '!') == NULL)
 370                         /* nickname */
 371                         cl = Client_Search(currentTarget);
 372                 else
 373                         cl = NULL;
 374
 375                 if (cl == NULL) {
 376                         /* If currentTarget isn't a nickname check for:
 377                          * user ["%" host] "@" servername
 378                          * user "%" host
 379                          * nickname "!" user "@" host
 380                          */
 381                         char target[COMMAND_LEN];
 382                         char * nick = NULL;
 383                         char * user = NULL;
 384                         char * host = NULL;
 385                         char * server = NULL;
 386
 387                         strlcpy(target, currentTarget, COMMAND_LEN);
 388                         server = strchr(target, '@');
 389                         if (server) {
 390                                 *server = '\0';
 391                                 server++;
 392                         }
 393                         host = strchr(target, '%');
 394                         if (host) {
 395                                 *host = '\0';
 396                                 host++;
 397                         }
 398                         user = strchr(target, '!');
 399                         if (user) {
 400                                 /* msgto form: nick!user@host */
 401                                 *user = '\0';
 402                                 user++;
 403                                 nick = target;
 404                                 host = server; /* not "@server" but "@host" */
 405                         } else {
 406                                 user = target;
 407                         }
 408
 409                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 410                                 if (Client_Type(cl) != CLIENT_USER &&
 411                                     Client_Type(cl) != CLIENT_SERVICE)
 412                                         continue;
 413                                 if (nick != NULL && host != NULL) {
 414                                         if (strcmp(nick, Client_ID(cl)) == 0 &&
 415                                             strcmp(user, Client_User(cl)) == 0 &&
 416                                             strcasecmp(host, Client_HostnameCloaked(cl)) == 0)
 417                                                 break;
 418                                         else
 419                                                 continue;
 420                                 }
 421                                 if (strcasecmp(user, Client_User(cl)) != 0)
 422                                         continue;
 423                                 if (host != NULL && strcasecmp(host,
 424                                                 Client_HostnameCloaked(cl)) != 0)
 425                                         continue;
 426                                 if (server != NULL && strcasecmp(server,
 427                                                 Client_ID(Client_Introducer(cl))) != 0)
 428                                         continue;
 429                                 break;
 430                         }
 431                 }
 432
 433                 if (cl) {
 434                         /* Target is a user, enforce type */
 435 #ifndef STRICT_RFC
 436                         if (Client_Type(cl) != ForceType &&
 437                             !(ForceType == CLIENT_USER &&
 438                               (Client_Type(cl) == CLIENT_USER ||
 439                                Client_Type(cl) == CLIENT_SERVICE))) {
 440 #else
 441                         if (Client_Type(cl) != ForceType) {
 442 #endif
 443                                 if (!SendErrors)
 444                                         return CONNECTED;
 445                                 return IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 446                                                           Client_ID(from),
 447                                                           currentTarget);
 448                         }
 449
 450 #ifndef STRICT_RFC
 451                         if (ForceType == CLIENT_SERVICE &&
 452                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 453                              & CONN_RFC1459)) {
 454                                 /* SQUERY command but RFC 1459 link: convert
 455                                  * request to PRIVMSG command */
 456                                 Req->command = "PRIVMSG";
 457                         }
 458 #endif
 459
 460                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 461                             && strchr(Client_Modes(cl), 'a')) {
 462                                 /* Target is away */
 463                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 464                                                         Client_ID(from),
 465                                                         Client_ID(cl),
 466                                                         Client_Away(cl)))
 467                                         return DISCONNECTED;
 468                         }
 469                         if (Client_Conn(from) > NONE) {
 470                                 Conn_UpdateIdle(Client_Conn(from));
 471                         }
 472                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 473                                                       Req->command, Client_ID(cl),
 474                                                       Req->argv[1]))
 475                                 return DISCONNECTED;
 476                 } else if (ForceType != CLIENT_SERVICE
 477                            && (chan = Channel_Search(currentTarget))) {
 478                         if (!Channel_Write(chan, from, Client, Req->command,
 479                                            SendErrors, Req->argv[1]))
 480                                         return DISCONNECTED;
 481                 } else if (ForceType != CLIENT_SERVICE
 482                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 483                            && strchr("$#", currentTarget[0])
 484                            && strchr(currentTarget, '.')) {
 485                         /* targetmask */
 486                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 487                                                Req->argv[1], SendErrors))
 488                                 return DISCONNECTED;
 489                 } else {
 490                         if (!SendErrors)
 491                                 return CONNECTED;
 492                         if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 493                                                 Client_ID(from), currentTarget))
 494                                 return DISCONNECTED;
 495                 }
 496
 497                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 498         }
 499
 500         return CONNECTED;
 501 } /* Send_Message */
 502
 503
 504 static bool
 505 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 506                   char * message, bool SendErrors)
 507 {
 508         CLIENT *cl;
 509         bool client_match;
 510         char *mask = targetMask + 1;
 511         const char *check_wildcards;
 512
 513         cl = NULL;
 514
 515         if (strchr(Client_Modes(from), 'o') == NULL) {
 516                 if (!SendErrors)
 517                         return true;
 518                 return IRC_WriteStrClient(from, ERR_NOPRIVILEGES_MSG,
 519                                           Client_ID(from));
 520         }
 521
 522         /*
 523          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 524          * dot (".") and no wildcards ("*", "?") following the last one.
 525          */
 526         check_wildcards = strrchr(targetMask, '.');
 527         assert(check_wildcards != NULL);
 528         if (check_wildcards &&
 529                 check_wildcards[strcspn(check_wildcards, "*?")])
 530         {
 531                 if (!SendErrors)
 532                         return true;
 533                 return IRC_WriteStrClient(from, ERR_WILDTOPLEVEL, targetMask);
 534         }
 535
 536         /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 537         if (targetMask[0] == '#') {
 538                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 539                         if (Client_Type(cl) != CLIENT_USER)
 540                                 continue;
 541                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 542                         if (client_match)
 543                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 544                                                 command, Client_ID(cl), message))
 545                                         return false;
 546                 }
 547         } else {
 548                 assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
 549                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 550                         if (Client_Type(cl) != CLIENT_USER)
 551                                 continue;
 552                         client_match = MatchCaseInsensitive(mask,
 553                                         Client_ID(Client_Introducer(cl)));
 554                         if (client_match)
 555                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 556                                                 command, Client_ID(cl), message))
 557                                         return false;
 558                 }
 559         }
 560         return CONNECTED;
 561 } /* Send_Message_Mask */
 562
 563
 564 /* -eof- */