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 the client NOW:
 164                  *  - Close the local connection (if there is one),
 165                  *  - Destroy the CLIENT structure for remote clients.
 166                  * Note: Conn_Close() removes the CLIENT structure as well. */
 167                 conn = Client_Conn( c );
 168                 if(conn > NONE)
 169                         Conn_Close(conn, NULL, reason, true);
 170                 else
 171                         Client_Destroy(c, NULL, reason, false);
 172         }
 173         else
 174                 Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
 175
 176         /* Are we still connected or were we killed, too? */
 177         if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
 178                 return CONNECTED;
 179         else
 180                 return DISCONNECTED;
 181 } /* IRC_KILL */
 182
 183
 184 /**
 185  * Handler for the IRC command NOTICE.
 186  */
 187 GLOBAL bool
 188 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 189 {
 190         return Send_Message(Client, Req, CLIENT_USER, false);
 191 } /* IRC_NOTICE */
 192
 193
 194 /**
 195  * Handler for the IRC command PRIVMSG.
 196  */
 197 GLOBAL bool
 198 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 199 {
 200         return Send_Message(Client, Req, CLIENT_USER, true);
 201 } /* IRC_PRIVMSG */
 202
 203
 204 /**
 205  * Handler for the IRC command SQUERY.
 206  */
 207 GLOBAL bool
 208 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 209 {
 210         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 211 } /* IRC_SQUERY */
 212
 213
 214 GLOBAL bool
 215 IRC_TRACE( CLIENT *Client, REQUEST *Req )
 216 {
 217         CLIENT *from, *target, *c;
 218         CONN_ID idx, idx2;
 219         char user[CLIENT_USER_LEN];
 220
 221         assert( Client != NULL );
 222         assert( Req != NULL );
 223
 224         /* Bad number of arguments? */
 225         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 226
 227         /* Search sender */
 228         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 229         else from = Client;
 230         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 231
 232         /* Search target */
 233         if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
 234         else target = Client_ThisServer( );
 235
 236         /* Forward command to other server? */
 237         if( target != Client_ThisServer( ))
 238         {
 239                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
 240
 241                 /* Send RPL_TRACELINK back to initiator */
 242                 idx = Client_Conn( Client ); assert( idx > NONE );
 243                 idx2 = Client_Conn( Client_NextHop( target )); assert( idx2 > NONE );
 244                 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;
 245
 246                 /* Forward command */
 247                 IRC_WriteStrClientPrefix( target, from, "TRACE %s", Req->argv[0] );
 248                 return CONNECTED;
 249         }
 250
 251         /* Infos about all connected servers */
 252         c = Client_First( );
 253         while( c )
 254         {
 255                 if( Client_Conn( c ) > NONE )
 256                 {
 257                         /* Local client */
 258                         if( Client_Type( c ) == CLIENT_SERVER )
 259                         {
 260                                 /* Server link */
 261                                 strlcpy( user, Client_User( c ), sizeof( user ));
 262                                 if( user[0] == '~' ) strlcpy( user, "unknown", sizeof( user ));
 263                                 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;
 264                         }
 265                         if(( Client_Type( c ) == CLIENT_USER ) && ( strchr( Client_Modes( c ), 'o' )))
 266                         {
 267                                 /* IRC Operator */
 268                                 if( ! IRC_WriteStrClient( from, RPL_TRACEOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
 269                         }
 270                 }
 271                 c = Client_Next( c );
 272         }
 273
 274         IRC_SetPenalty( Client, 3 );
 275         return IRC_WriteStrClient( from, RPL_TRACEEND_MSG, Client_ID( from ), Conf_ServerName, PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_DebugLevel );
 276 } /* IRC_TRACE */
 277
 278
 279 GLOBAL bool
 280 IRC_HELP( CLIENT *Client, REQUEST *Req )
 281 {
 282         COMMAND *cmd;
 283
 284         assert( Client != NULL );
 285         assert( Req != NULL );
 286
 287         /* Bad number of arguments? */
 288         if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 289
 290         cmd = Parse_GetCommandStruct( );
 291         while( cmd->name )
 292         {
 293                 if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
 294                 cmd++;
 295         }
 296
 297         IRC_SetPenalty( Client, 2 );
 298         return CONNECTED;
 299 } /* IRC_HELP */
 300
 301
 302 static char *
 303 Option_String( CONN_ID Idx )
 304 {
 305         static char option_txt[8];
 306         UINT16 options;
 307
 308         options = Conn_Options(Idx);
 309
 310         strcpy(option_txt, "F");        /* No idea what this means, but the
 311                                          * original ircd sends it ... */
 312 #ifdef ZLIB
 313         if(options & CONN_ZIP)          /* zlib compression supported. */
 314                 strcat(option_txt, "z");
 315 #endif
 316
 317         return option_txt;
 318 } /* Option_String */
 319
 320
 321 static bool
 322 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 323 {
 324         CLIENT *cl, *from;
 325         CHANNEL *chan;
 326         char *currentTarget = Req->argv[0];
 327         char *lastCurrentTarget = NULL;
 328
 329         assert(Client != NULL);
 330         assert(Req != NULL);
 331
 332         if (Req->argc == 0) {
 333                 if (!SendErrors)
 334                         return CONNECTED;
 335                 return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
 336                                           Client_ID(Client), Req->command);
 337         }
 338         if (Req->argc == 1) {
 339                 if (!SendErrors)
 340                         return CONNECTED;
 341                 return IRC_WriteStrClient(Client, ERR_NOTEXTTOSEND_MSG,
 342                                           Client_ID(Client));
 343         }
 344         if (Req->argc > 2) {
 345                 if (!SendErrors)
 346                         return CONNECTED;
 347                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 348                                           Client_ID(Client), Req->command);
 349         }
 350
 351         if (Client_Type(Client) == CLIENT_SERVER)
 352                 from = Client_Search(Req->prefix);
 353         else
 354                 from = Client;
 355         if (!from)
 356                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 357                                           Client_ID(Client), Req->prefix);
 358
 359         /* handle msgtarget = msgto *("," msgto) */
 360         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 361         ngt_UpperStr(Req->command);
 362
 363         while (currentTarget) {
 364                 /* Check for and handle valid <msgto> of form:
 365                  * RFC 2812 2.3.1:
 366                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 367                  *   msgto =/ ( user "%" host ) / targetmask
 368                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 369                  */
 370                 if (strchr(currentTarget, '!') == NULL)
 371                         /* nickname */
 372                         cl = Client_Search(currentTarget);
 373                 else
 374                         cl = NULL;
 375
 376                 if (cl == NULL) {
 377                         /* If currentTarget isn't a nickname check for:
 378                          * user ["%" host] "@" servername
 379                          * user "%" host
 380                          * nickname "!" user "@" host
 381                          */
 382                         char target[COMMAND_LEN];
 383                         char * nick = NULL;
 384                         char * user = NULL;
 385                         char * host = NULL;
 386                         char * server = NULL;
 387
 388                         strlcpy(target, currentTarget, COMMAND_LEN);
 389                         server = strchr(target, '@');
 390                         if (server) {
 391                                 *server = '\0';
 392                                 server++;
 393                         }
 394                         host = strchr(target, '%');
 395                         if (host) {
 396                                 *host = '\0';
 397                                 host++;
 398                         }
 399                         user = strchr(target, '!');
 400                         if (user) {
 401                                 /* msgto form: nick!user@host */
 402                                 *user = '\0';
 403                                 user++;
 404                                 nick = target;
 405                                 host = server; /* not "@server" but "@host" */
 406                         } else {
 407                                 user = target;
 408                         }
 409
 410                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 411                                 if (Client_Type(cl) != CLIENT_USER &&
 412                                     Client_Type(cl) != CLIENT_SERVICE)
 413                                         continue;
 414                                 if (nick != NULL && host != NULL) {
 415                                         if (strcmp(nick, Client_ID(cl)) == 0 &&
 416                                             strcmp(user, Client_User(cl)) == 0 &&
 417                                             strcasecmp(host, Client_Hostname(cl)) == 0)
 418                                                 break;
 419                                         else
 420                                                 continue;
 421                                 }
 422                                 if (strcasecmp(user, Client_User(cl)) != 0)
 423                                         continue;
 424                                 if (host != NULL && strcasecmp(host,
 425                                                 Client_Hostname(cl)) != 0)
 426                                         continue;
 427                                 if (server != NULL && strcasecmp(server,
 428                                                 Client_ID(Client_Introducer(cl))) != 0)
 429                                         continue;
 430                                 break;
 431                         }
 432                 }
 433
 434                 if (cl) {
 435                         /* Target is a user, enforce type */
 436 #ifndef STRICT_RFC
 437                         if (Client_Type(cl) != ForceType &&
 438                             !(ForceType == CLIENT_USER &&
 439                               (Client_Type(cl) == CLIENT_USER ||
 440                                Client_Type(cl) == CLIENT_SERVICE))) {
 441 #else
 442                         if (Client_Type(cl) != ForceType) {
 443 #endif
 444                                 if (!SendErrors)
 445                                         return CONNECTED;
 446                                 return IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 447                                                           Client_ID(from),
 448                                                           currentTarget);
 449                         }
 450
 451 #ifndef STRICT_RFC
 452                         if (ForceType == CLIENT_SERVICE &&
 453                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 454                              & CONN_RFC1459)) {
 455                                 /* SQUERY command but RFC 1459 link: convert
 456                                  * request to PRIVMSG command */
 457                                 Req->command = "PRIVMSG";
 458                         }
 459 #endif
 460
 461                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 462                             && strchr(Client_Modes(cl), 'a')) {
 463                                 /* Target is away */
 464                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 465                                                         Client_ID(from),
 466                                                         Client_ID(cl),
 467                                                         Client_Away(cl)))
 468                                         return DISCONNECTED;
 469                         }
 470                         if (Client_Conn(from) > NONE) {
 471                                 Conn_UpdateIdle(Client_Conn(from));
 472                         }
 473                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 474                                                       Req->command, Client_ID(cl),
 475                                                       Req->argv[1]))
 476                                 return DISCONNECTED;
 477                 } else if (ForceType != CLIENT_SERVICE
 478                            && (chan = Channel_Search(currentTarget))) {
 479                         if (!Channel_Write(chan, from, Client, Req->command,
 480                                            SendErrors, Req->argv[1]))
 481                                         return DISCONNECTED;
 482                 } else if (ForceType != CLIENT_SERVICE
 483                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 484                            && strchr("$#", currentTarget[0])
 485                            && strchr(currentTarget, '.')) {
 486                         /* targetmask */
 487                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 488                                                Req->argv[1], SendErrors))
 489                                 return DISCONNECTED;
 490                 } else {
 491                         if (!SendErrors)
 492                                 return CONNECTED;
 493                         if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 494                                                 Client_ID(from), currentTarget))
 495                                 return DISCONNECTED;
 496                 }
 497
 498                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 499         }
 500
 501         return CONNECTED;
 502 } /* Send_Message */
 503
 504
 505 static bool
 506 Send_Message_Mask(CLIENT * from, char * command, char * targetMask,
 507                   char * message, bool SendErrors)
 508 {
 509         CLIENT *cl;
 510         bool client_match;
 511         char *mask = targetMask + 1;
 512         const char *check_wildcards;
 513
 514         cl = NULL;
 515
 516         if (strchr(Client_Modes(from), 'o') == NULL) {
 517                 if (!SendErrors)
 518                         return true;
 519                 return IRC_WriteStrClient(from, ERR_NOPRIVILEGES_MSG,
 520                                           Client_ID(from));
 521         }
 522
 523         /*
 524          * RFC 2812, sec. 3.3.1 requires that targetMask have at least one
 525          * dot (".") and no wildcards ("*", "?") following the last one.
 526          */
 527         check_wildcards = strrchr(targetMask, '.');
 528         assert(check_wildcards != NULL);
 529         if (check_wildcards &&
 530                 check_wildcards[strcspn(check_wildcards, "*?")])
 531         {
 532                 if (!SendErrors)
 533                         return true;
 534                 return IRC_WriteStrClient(from, ERR_WILDTOPLEVEL, targetMask);
 535         }
 536
 537         /* #: hostmask, see RFC 2812, sec. 3.3.1 */
 538         if (targetMask[0] == '#') {
 539                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 540                         if (Client_Type(cl) != CLIENT_USER)
 541                                 continue;
 542                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 543                         if (client_match)
 544                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 545                                                 command, Client_ID(cl), message))
 546                                         return false;
 547                 }
 548         } else {
 549                 assert(targetMask[0] == '$'); /* $: server mask, see RFC 2812, sec. 3.3.1 */
 550                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 551                         if (Client_Type(cl) != CLIENT_USER)
 552                                 continue;
 553                         client_match = MatchCaseInsensitive(mask,
 554                                         Client_ID(Client_Introducer(cl)));
 555                         if (client_match)
 556                                 if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 557                                                 command, Client_ID(cl), message))
 558                                         return false;
 559                 }
 560         }
 561         return CONNECTED;
 562 } /* Send_Message_Mask */
 563
 564
 565 /* -eof- */