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