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  * IRC commands
  12  */
  13
  14
  15 #include "portab.h"
  16
  17 static char UNUSED id[] = "$Id: irc.c,v 1.132 2008/01/15 22:28:14 fw Exp $";
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "ngircd.h"
  25 #include "resolve.h"
  26 #include "conn-func.h"
  27 #include "conf.h"
  28 #include "client.h"
  29 #include "channel.h"
  30 #include "defines.h"
  31 #include "irc-write.h"
  32 #include "log.h"
  33 #include "match.h"
  34 #include "messages.h"
  35 #include "parse.h"
  36 #include "tool.h"
  37
  38 #include "exp.h"
  39 #include "irc.h"
  40
  41
  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
  49
  50 GLOBAL bool
  51 IRC_ERROR( CLIENT *Client, REQUEST *Req )
  52 {
  53         assert( Client != NULL );
  54         assert( Req != NULL );
  55
  56         if (Req->argc < 1)
  57                 Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
  58                     Client_Mask(Client));
  59         else
  60                 Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
  61                     Client_Mask(Client), Req->argv[0]);
  62
  63         return CONNECTED;
  64 } /* IRC_ERROR */
  65
  66
  67 /**
  68  * Kill client on request.
  69  * This function implements the IRC command "KILL" wich is used to selectively
  70  * disconnect clients. It can be used by IRC operators and servers, for example
  71  * to "solve" nick collisions after netsplits.
  72  * Please note that this function is also called internally, without a real
  73  * KILL command being received over the network! Client is Client_ThisServer()
  74  * in this case. */
  75 GLOBAL bool
  76 IRC_KILL( CLIENT *Client, REQUEST *Req )
  77 {
  78         CLIENT *prefix, *c;
  79         char reason[COMMAND_LEN], *msg;
  80         CONN_ID my_conn, conn;
  81
  82         assert( Client != NULL );
  83         assert( Req != NULL );
  84
  85         if(( Client_Type( Client ) != CLIENT_SERVER ) &&
  86            ( ! Client_OperByMe( Client )))
  87         {
  88                 /* The originator of the KILL is neither an IRC operator of
  89                  * this server nor a server. */
  90                 return IRC_WriteStrClient( Client, ERR_NOPRIVILEGES_MSG,
  91                                            Client_ID( Client ));
  92         }
  93
  94         if( Req->argc != 2 )
  95         {
  96                 /* This command requires exactly 2 parameters! */
  97                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
  98                                            Client_ID( Client ), Req->command );
  99         }
 100
 101         if( Req->prefix ) prefix = Client_Search( Req->prefix );
 102         else prefix = Client;
 103         if( ! prefix )
 104         {
 105                 Log( LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
 106                      Req->prefix );
 107                 prefix = Client_ThisServer( );
 108         }
 109
 110         if( Client != Client_ThisServer( ))
 111         {
 112                 /* This is a "real" KILL received from the network. */
 113                 Log( LOG_NOTICE|LOG_snotice, "Got KILL command from \"%s\" for \"%s\": %s",
 114                      Client_Mask( prefix ), Req->argv[0], Req->argv[1] );
 115         }
 116
 117         /* Build reason string */
 118         if( Client_Type( Client ) == CLIENT_USER )
 119         {
 120                 /* Prefix the "reason" if the originator is a regular user,
 121                  * so users can't spoof KILLs of servers. */
 122                 snprintf( reason, sizeof( reason ), "KILLed by %s: %s",
 123                           Client_ID( Client ), Req->argv[1] );
 124         }
 125         else
 126                 strlcpy( reason, Req->argv[1], sizeof( reason ));
 127
 128         /* Inform other servers */
 129         IRC_WriteStrServersPrefix( Client, prefix, "KILL %s :%s",
 130                                    Req->argv[0], reason );
 131
 132         /* Save ID of this connection */
 133         my_conn = Client_Conn( Client );
 134
 135         /* Do we host such a client? */
 136         c = Client_Search( Req->argv[0] );
 137         if( c )
 138         {
 139                 if(( Client_Type( c ) != CLIENT_USER ) &&
 140                    ( Client_Type( c ) != CLIENT_GOTNICK ))
 141                 {
 142                         /* Target of this KILL is not a regular user, this is
 143                          * invalid! So we ignore this case if we received a
 144                          * regular KILL from the network and try to kill the
 145                          * client/connection anyway (but log an error!) if the
 146                          * origin is the local server. */
 147
 148                         if( Client != Client_ThisServer( ))
 149                         {
 150                                 /* Invalid KILL received from remote */
 151                                 if( Client_Type( c ) == CLIENT_SERVER )
 152                                         msg = ERR_CANTKILLSERVER_MSG;
 153                                 else
 154                                         msg = ERR_NOPRIVILEGES_MSG;
 155                                 return IRC_WriteStrClient( Client, msg,
 156                                         Client_ID( Client ));
 157                         }
 158
 159                         Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
 160                              Client_Type( c ), Req->argv[0] );
 161                 }
 162
 163                 /* Kill client NOW! */
 164                 conn = Client_Conn( c );
 165                 Client_Destroy( c, NULL, reason, false );
 166                 if( conn > NONE )
 167                         Conn_Close( conn, NULL, reason, true );
 168         }
 169         else
 170                 Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
 171
 172         /* Are we still connected or were we killed, too? */
 173         if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
 174                 return CONNECTED;
 175         else
 176                 return DISCONNECTED;
 177 } /* IRC_KILL */
 178
 179
 180 /**
 181  * Handler for the IRC command NOTICE.
 182  */
 183 GLOBAL bool
 184 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 185 {
 186         return Send_Message(Client, Req, CLIENT_USER, false);
 187 } /* IRC_NOTICE */
 188
 189
 190 /**
 191  * Handler for the IRC command PRIVMSG.
 192  */
 193 GLOBAL bool
 194 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 195 {
 196         return Send_Message(Client, Req, CLIENT_USER, true);
 197 } /* IRC_PRIVMSG */
 198
 199
 200 /**
 201  * Handler for the IRC command SQUERY.
 202  */
 203 GLOBAL bool
 204 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 205 {
 206         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 207 } /* IRC_SQUERY */
 208
 209
 210 GLOBAL bool
 211 IRC_TRACE( CLIENT *Client, REQUEST *Req )
 212 {
 213         CLIENT *from, *target, *c;
 214         CONN_ID idx, idx2;
 215         char user[CLIENT_USER_LEN];
 216
 217         assert( Client != NULL );
 218         assert( Req != NULL );
 219
 220         /* Bad number of arguments? */
 221         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 222
 223         /* Search sender */
 224         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 225         else from = Client;
 226         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 227
 228         /* Search target */
 229         if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
 230         else target = Client_ThisServer( );
 231
 232         /* Forward command to other server? */
 233         if( target != Client_ThisServer( ))
 234         {
 235                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
 236
 237                 /* Send RPL_TRACELINK back to initiator */
 238                 idx = Client_Conn( Client ); assert( idx > NONE );
 239                 idx2 = Client_Conn( Client_NextHop( target )); assert( idx2 > NONE );
 240                 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;
 241
 242                 /* Forward command */
 243                 IRC_WriteStrClientPrefix( target, from, "TRACE %s", Req->argv[0] );
 244                 return CONNECTED;
 245         }
 246
 247         /* Infos about all connected servers */
 248         c = Client_First( );
 249         while( c )
 250         {
 251                 if( Client_Conn( c ) > NONE )
 252                 {
 253                         /* Local client */
 254                         if( Client_Type( c ) == CLIENT_SERVER )
 255                         {
 256                                 /* Server link */
 257                                 strlcpy( user, Client_User( c ), sizeof( user ));
 258                                 if( user[0] == '~' ) strlcpy( user, "unknown", sizeof( user ));
 259                                 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;
 260                         }
 261                         if(( Client_Type( c ) == CLIENT_USER ) && ( strchr( Client_Modes( c ), 'o' )))
 262                         {
 263                                 /* IRC Operator */
 264                                 if( ! IRC_WriteStrClient( from, RPL_TRACEOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
 265                         }
 266                 }
 267                 c = Client_Next( c );
 268         }
 269
 270         IRC_SetPenalty( Client, 3 );
 271         return IRC_WriteStrClient( from, RPL_TRACEEND_MSG, Client_ID( from ), Conf_ServerName, PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_DebugLevel );
 272 } /* IRC_TRACE */
 273
 274
 275 GLOBAL bool
 276 IRC_HELP( CLIENT *Client, REQUEST *Req )
 277 {
 278         COMMAND *cmd;
 279
 280         assert( Client != NULL );
 281         assert( Req != NULL );
 282
 283         /* Bad number of arguments? */
 284         if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 285
 286         cmd = Parse_GetCommandStruct( );
 287         while( cmd->name )
 288         {
 289                 if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
 290                 cmd++;
 291         }
 292
 293         IRC_SetPenalty( Client, 2 );
 294         return CONNECTED;
 295 } /* IRC_HELP */
 296
 297
 298 static char *
 299 Option_String( CONN_ID Idx )
 300 {
 301         static char option_txt[8];
 302         UINT16 options;
 303
 304         options = Conn_Options(Idx);
 305
 306         strcpy(option_txt, "F");        /* No idea what this means, but the
 307                                          * original ircd sends it ... */
 308 #ifdef ZLIB
 309         if(options & CONN_ZIP)          /* zlib compression supported. */
 310                 strcat(option_txt, "z");
 311 #endif
 312
 313         return option_txt;
 314 } /* Option_String */
 315
 316
 317 static bool
 318 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 319 {
 320         CLIENT *cl, *from;
 321         CHANNEL *chan;
 322         char *currentTarget = Req->argv[0];
 323         char *lastCurrentTarget = NULL;
 324
 325         assert(Client != NULL);
 326         assert(Req != NULL);
 327
 328         if (Req->argc == 0) {
 329                 if (!SendErrors)
 330                         return CONNECTED;
 331                 return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
 332                                           Client_ID(Client), Req->command);
 333         }
 334         if (Req->argc == 1) {
 335                 if (!SendErrors)
 336                         return CONNECTED;
 337                 return IRC_WriteStrClient(Client, ERR_NOTEXTTOSEND_MSG,
 338                                           Client_ID(Client));
 339         }
 340         if (Req->argc > 2) {
 341                 if (!SendErrors)
 342                         return CONNECTED;
 343                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 344                                           Client_ID(Client), Req->command);
 345         }
 346
 347         if (Client_Type(Client) == CLIENT_SERVER)
 348                 from = Client_Search(Req->prefix);
 349         else
 350                 from = Client;
 351         if (!from)
 352                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 353                                           Client_ID(Client), Req->prefix);
 354
 355         /* handle msgtarget = msgto *("," msgto) */
 356         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 357         ngt_UpperStr(Req->command);
 358
 359         while (currentTarget) {
 360                 /* Check for and handle valid <msgto> of form:
 361                  * RFC 2812 2.3.1:
 362                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 363                  *   msgto =/ ( user "%" host ) / targetmask
 364                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 365                  */
 366                 if (strchr(currentTarget, '!') == NULL)
 367                         /* nickname */
 368                         cl = Client_Search(currentTarget);
 369                 else
 370                         cl = NULL;
 371
 372                 if (cl == NULL) {
 373                         /* If currentTarget isn't a nickname check for:
 374                          * user ["%" host] "@" servername
 375                          * user "%" host
 376                          * nickname "!" user "@" host
 377                          */
 378                         char target[COMMAND_LEN];
 379                         char * nick = NULL;
 380                         char * user = NULL;
 381                         char * host = NULL;
 382                         char * server = NULL;
 383
 384                         strlcpy(target, currentTarget, COMMAND_LEN);
 385                         server = strchr(target, '@');
 386                         if (server) {
 387                                 *server = '\0';
 388                                 server++;
 389                         }
 390                         host = strchr(target, '%');
 391                         if (host) {
 392                                 *host = '\0';
 393                                 host++;
 394                         }
 395                         user = strchr(target, '!');
 396                         if (user) {
 397                                 /* msgto form: nick!user@host */
 398                                 *user = '\0';
 399                                 user++;
 400                                 nick = target;
 401                                 host = server; /* not "@server" but "@host" */
 402                         } else {
 403                                 user = target;
 404                         }
 405
 406                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 407                                 if (Client_Type(cl) != CLIENT_USER &&
 408                                     Client_Type(cl) != CLIENT_SERVICE)
 409                                         continue;
 410                                 if (nick != NULL && host != NULL) {
 411                                         if (strcmp(nick, Client_ID(cl)) == 0 &&
 412                                             strcmp(user, Client_User(cl)) == 0 &&
 413                                             strcasecmp(host, Client_Hostname(cl)) == 0)
 414                                                 break;
 415                                         else
 416                                                 continue;
 417                                 }
 418                                 if (strcasecmp(user, Client_User(cl)) != 0)
 419                                         continue;
 420                                 if (host != NULL && strcasecmp(host,
 421                                                 Client_Hostname(cl)) != 0)
 422                                         continue;
 423                                 if (server != NULL && strcasecmp(server,
 424                                                 Client_ID(Client_Introducer(cl))) != 0)
 425                                         continue;
 426                                 break;
 427                         }
 428                 }
 429
 430                 if (cl) {
 431                         /* Target is a user, enforce type */
 432 #ifndef STRICT_RFC
 433                         if (Client_Type(cl) != ForceType &&
 434                             !(ForceType == CLIENT_USER &&
 435                               (Client_Type(cl) == CLIENT_USER ||
 436                                Client_Type(cl) == CLIENT_SERVICE))) {
 437 #else
 438                         if (Client_Type(cl) != ForceType) {
 439 #endif
 440                                 if (!SendErrors)
 441                                         return CONNECTED;
 442                                 return IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 443                                                           Client_ID(from),
 444                                                           currentTarget);
 445                         }
 446
 447 #ifndef STRICT_RFC
 448                         if (ForceType == CLIENT_SERVICE &&
 449                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 450                              & CONN_RFC1459)) {
 451                                 /* SQUERY command but RFC 1459 link: convert
 452                                  * request to PRIVMSG command */
 453                                 Req->command = "PRIVMSG";
 454                         }
 455 #endif
 456
 457                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 458                             && strchr(Client_Modes(cl), 'a')) {
 459                                 /* Target is away */
 460                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 461                                                         Client_ID(from),
 462                                                         Client_ID(cl),
 463                                                         Client_Away(cl)))
 464                                         return DISCONNECTED;
 465                         }
 466                         if (Client_Conn(from) > NONE) {
 467                                 Conn_UpdateIdle(Client_Conn(from));
 468                         }
 469                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 470                                                       Req->command, Client_ID(cl),
 471                                                       Req->argv[1]))
 472                                 return DISCONNECTED;
 473                 } else if (ForceType != CLIENT_SERVICE
 474                            && (chan = Channel_Search(currentTarget))) {
 475                         if (!Channel_Write(chan, from, Client, Req->command,
 476                                            SendErrors, Req->argv[1]))
 477                                         return DISCONNECTED;
 478                 } else if (ForceType != CLIENT_SERVICE
 479                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 480                            && strchr("$#", currentTarget[0])
 481                            && strchr(currentTarget, '.')) {
 482                         /* targetmask */
 483                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 484                                                Req->argv[1], SendErrors))
 485                                 return DISCONNECTED;
 486                 } else {
 487                         if (!SendErrors)
 488                                 return CONNECTED;
 489                         if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 490                                                 Client_ID(from), currentTarget))
 491                                 return DISCONNECTED;
 492                 }
 493
 494                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 495         }
 496
 497         return CONNECTED;
 498 } /* Send_Message */
 499
 500
 501 static bool
 502 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 503                   char * message, bool SendErrors)
 504 {
 505         CLIENT *cl;
 506         bool client_match;
 507         char *mask = targetMask + 1;
 508         const char *check_wildcards;
 509
 510         cl = NULL;
 511
 512         if (strchr(Client_Modes(from), 'o') == NULL) {
 513                 if (!SendErrors)
 514                         return true;
 515                 return IRC_WriteStrClient(from, ERR_NOPRIVILEGES_MSG,
 516                                           Client_ID(from));
 517         }
 518
 519         /*
 520          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 521          * dot (".") and no wildcards ("*", "?") following the last one.
 522          */
 523         check_wildcards = strrchr(targetMask, '.');
 524         assert(check_wildcards != NULL);
 525         if (check_wildcards &&
 526                 check_wildcards[strcspn(check_wildcards, "*?")])
 527         {
 528                 if (!SendErrors)
 529                         return true;
 530                 return IRC_WriteStrClient(from, ERR_WILDTOPLEVEL, targetMask);
 531         }
 532
 533         /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 534         if (targetMask[0] == '#') {
 535                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 536                         if (Client_Type(cl) != CLIENT_USER)
 537                                 continue;
 538                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 539                         if (client_match)
 540                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 541                                                 command, Client_ID(cl), message))
 542                                         return false;
 543                 }
 544         } else {
 545                 assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
 546                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 547                         if (Client_Type(cl) != CLIENT_USER)
 548                                 continue;
 549                         client_match = MatchCaseInsensitive(mask,
 550                                         Client_ID(Client_Introducer(cl)));
 551                         if (client_match)
 552                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 553                                                 command, Client_ID(cl), message))
 554                                         return false;
 555                 }
 556         }
 557         return CONNECTED;
 558 } /* Send_Message_Mask */
 559
 560
 561 /* -eof- */