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 #include "portab.h"
  13
  14 /**
  15  * @file
  16  * IRC commands
  17  */
  18
  19 #include "imp.h"
  20 #include <assert.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "ngircd.h"
  25 #include "conn-func.h"
  26 #include "conf.h"
  27 #include "channel.h"
  28 #include "defines.h"
  29 #include "irc-write.h"
  30 #include "log.h"
  31 #include "match.h"
  32 #include "messages.h"
  33 #include "parse.h"
  34 #include "tool.h"
  35
  36 #include "exp.h"
  37 #include "irc.h"
  38
  39
  40 static char *Option_String PARAMS((CONN_ID Idx));
  41 static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType,
  42                                  bool SendErrors));
  43 static bool Send_Message_Mask PARAMS((CLIENT *from, char *command,
  44                                       char *targetMask, char *message,
  45                                       bool SendErrors));
  46
  47
  48 GLOBAL bool
  49 IRC_ERROR( CLIENT *Client, REQUEST *Req )
  50 {
  51         assert( Client != NULL );
  52         assert( Req != NULL );
  53
  54         if (Req->argc < 1)
  55                 Log(LOG_NOTICE, "Got ERROR from \"%s\"!",
  56                     Client_Mask(Client));
  57         else
  58                 Log(LOG_NOTICE, "Got ERROR from \"%s\": \"%s\"!",
  59                     Client_Mask(Client), Req->argv[0]);
  60
  61         return CONNECTED;
  62 } /* IRC_ERROR */
  63
  64
  65 /**
  66  * Handler for the IRC "KILL" command.
  67  *
  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. See RFC 2812 section 3.7.1.
  71  *
  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, and the prefix in Req is NULL.
  75  *
  76  * @param Client        The client from which this command has been received
  77  *                      or Client_ThisServer() when generated interanlly.
  78  * @param Req           Request structure with prefix and all parameters.
  79  * @returns             CONNECTED or DISCONNECTED.
  80  */
  81 GLOBAL bool
  82 IRC_KILL( CLIENT *Client, REQUEST *Req )
  83 {
  84         CLIENT *prefix, *c;
  85         char reason[COMMAND_LEN], *msg;
  86         CONN_ID my_conn, conn;
  87
  88         assert (Client != NULL);
  89         assert (Req != NULL);
  90
  91         if (Client_Type(Client) != CLIENT_SERVER && !Client_OperByMe(Client))
  92                 return IRC_WriteStrClient(Client, ERR_NOPRIVILEGES_MSG,
  93                                           Client_ID(Client));
  94
  95         if (Req->argc != 2)
  96                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
  97                                           Client_ID(Client), Req->command);
  98
  99         /* Get prefix (origin); use the client if no prefix is given. */
 100         if (Req->prefix)
 101                 prefix = Client_Search(Req->prefix);
 102         else
 103                 prefix = Client;
 104
 105         /* Log a warning message and use this server as origin when the
 106          * prefix (origin) is invalid. */
 107         if (!prefix) {
 108                 Log(LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
 109                     Req->prefix );
 110                 prefix = Client_ThisServer();
 111         }
 112
 113         if (Client != Client_ThisServer())
 114                 Log(LOG_NOTICE|LOG_snotice,
 115                     "Got KILL command from \"%s\" for \"%s\": %s",
 116                     Client_Mask(prefix), Req->argv[0], Req->argv[1]);
 117
 118         /* Build reason string: Prefix the "reason" if the originator is a
 119          * regular user, so users can't spoof KILLs of servers. */
 120         if (Client_Type(Client) == CLIENT_USER)
 121                 snprintf(reason, sizeof(reason), "KILLed by %s: %s",
 122                          Client_ID(Client), Req->argv[1]);
 123         else
 124                 strlcpy(reason, Req->argv[1], sizeof(reason));
 125
 126         /* Inform other servers */
 127         IRC_WriteStrServersPrefix(Client, prefix, "KILL %s :%s",
 128                                   Req->argv[0], reason);
 129
 130         /* Save ID of this connection */
 131         my_conn = Client_Conn( Client );
 132
 133         /* Do we host such a client? */
 134         c = Client_Search( Req->argv[0] );
 135         if( c )
 136         {
 137                 if(( Client_Type( c ) != CLIENT_USER ) &&
 138                    ( Client_Type( c ) != CLIENT_GOTNICK ))
 139                 {
 140                         /* Target of this KILL is not a regular user, this is
 141                          * invalid! So we ignore this case if we received a
 142                          * regular KILL from the network and try to kill the
 143                          * client/connection anyway (but log an error!) if the
 144                          * origin is the local server. */
 145
 146                         if( Client != Client_ThisServer( ))
 147                         {
 148                                 /* Invalid KILL received from remote */
 149                                 if( Client_Type( c ) == CLIENT_SERVER )
 150                                         msg = ERR_CANTKILLSERVER_MSG;
 151                                 else
 152                                         msg = ERR_NOPRIVILEGES_MSG;
 153                                 return IRC_WriteStrClient( Client, msg,
 154                                         Client_ID( Client ));
 155                         }
 156
 157                         Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
 158                              Client_Type( c ), Req->argv[0] );
 159                 }
 160
 161                 /* Kill the client NOW:
 162                  *  - Close the local connection (if there is one),
 163                  *  - Destroy the CLIENT structure for remote clients.
 164                  * Note: Conn_Close() removes the CLIENT structure as well. */
 165                 conn = Client_Conn( c );
 166                 if(conn > NONE)
 167                         Conn_Close(conn, NULL, reason, true);
 168                 else
 169                         Client_Destroy(c, NULL, reason, false);
 170         }
 171         else
 172                 Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
 173
 174         /* Are we still connected or were we killed, too? */
 175         if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
 176                 return CONNECTED;
 177         else
 178                 return DISCONNECTED;
 179 } /* IRC_KILL */
 180
 181
 182 /**
 183  * Handler for the IRC command NOTICE.
 184  */
 185 GLOBAL bool
 186 IRC_NOTICE(CLIENT *Client, REQUEST *Req)
 187 {
 188         return Send_Message(Client, Req, CLIENT_USER, false);
 189 } /* IRC_NOTICE */
 190
 191
 192 /**
 193  * Handler for the IRC command PRIVMSG.
 194  */
 195 GLOBAL bool
 196 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 197 {
 198         return Send_Message(Client, Req, CLIENT_USER, true);
 199 } /* IRC_PRIVMSG */
 200
 201
 202 /**
 203  * Handler for the IRC command SQUERY.
 204  */
 205 GLOBAL bool
 206 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 207 {
 208         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 209 } /* IRC_SQUERY */
 210
 211
 212 GLOBAL bool
 213 IRC_TRACE( CLIENT *Client, REQUEST *Req )
 214 {
 215         CLIENT *from, *target, *c;
 216         CONN_ID idx, idx2;
 217         char user[CLIENT_USER_LEN];
 218
 219         assert( Client != NULL );
 220         assert( Req != NULL );
 221
 222         /* Bad number of arguments? */
 223         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 224
 225         /* Search sender */
 226         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 227         else from = Client;
 228         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 229
 230         /* Search target */
 231         if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
 232         else target = Client_ThisServer( );
 233
 234         /* Forward command to other server? */
 235         if( target != Client_ThisServer( ))
 236         {
 237                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
 238
 239                 /* Send RPL_TRACELINK back to initiator */
 240                 idx = Client_Conn( Client ); assert( idx > NONE );
 241                 idx2 = Client_Conn( Client_NextHop( target )); assert( idx2 > NONE );
 242                 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;
 243
 244                 /* Forward command */
 245                 IRC_WriteStrClientPrefix( target, from, "TRACE %s", Req->argv[0] );
 246                 return CONNECTED;
 247         }
 248
 249         /* Infos about all connected servers */
 250         c = Client_First( );
 251         while( c )
 252         {
 253                 if( Client_Conn( c ) > NONE )
 254                 {
 255                         /* Local client */
 256                         if( Client_Type( c ) == CLIENT_SERVER )
 257                         {
 258                                 /* Server link */
 259                                 strlcpy( user, Client_User( c ), sizeof( user ));
 260                                 if( user[0] == '~' ) strlcpy( user, "unknown", sizeof( user ));
 261                                 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;
 262                         }
 263                         if(( Client_Type( c ) == CLIENT_USER ) && ( strchr( Client_Modes( c ), 'o' )))
 264                         {
 265                                 /* IRC Operator */
 266                                 if( ! IRC_WriteStrClient( from, RPL_TRACEOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
 267                         }
 268                 }
 269                 c = Client_Next( c );
 270         }
 271
 272         IRC_SetPenalty( Client, 3 );
 273         return IRC_WriteStrClient( from, RPL_TRACEEND_MSG, Client_ID( from ), Conf_ServerName, PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_DebugLevel );
 274 } /* IRC_TRACE */
 275
 276
 277 GLOBAL bool
 278 IRC_HELP( CLIENT *Client, REQUEST *Req )
 279 {
 280         COMMAND *cmd;
 281
 282         assert( Client != NULL );
 283         assert( Req != NULL );
 284
 285         /* Bad number of arguments? */
 286         if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 287
 288         cmd = Parse_GetCommandStruct( );
 289         while( cmd->name )
 290         {
 291                 if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
 292                 cmd++;
 293         }
 294
 295         IRC_SetPenalty( Client, 2 );
 296         return CONNECTED;
 297 } /* IRC_HELP */
 298
 299
 300 static char *
 301 Option_String( CONN_ID Idx )
 302 {
 303         static char option_txt[8];
 304         UINT16 options;
 305
 306         options = Conn_Options(Idx);
 307
 308         strcpy(option_txt, "F");        /* No idea what this means, but the
 309                                          * original ircd sends it ... */
 310 #ifdef ZLIB
 311         if(options & CONN_ZIP)          /* zlib compression supported. */
 312                 strcat(option_txt, "z");
 313 #endif
 314
 315         return option_txt;
 316 } /* Option_String */
 317
 318
 319 static bool
 320 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 321 {
 322         CLIENT *cl, *from;
 323         CHANNEL *chan;
 324         char *currentTarget = Req->argv[0];
 325         char *lastCurrentTarget = NULL;
 326
 327         assert(Client != NULL);
 328         assert(Req != NULL);
 329
 330         if (Req->argc == 0) {
 331                 if (!SendErrors)
 332                         return CONNECTED;
 333                 return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
 334                                           Client_ID(Client), Req->command);
 335         }
 336         if (Req->argc == 1) {
 337                 if (!SendErrors)
 338                         return CONNECTED;
 339                 return IRC_WriteStrClient(Client, ERR_NOTEXTTOSEND_MSG,
 340                                           Client_ID(Client));
 341         }
 342         if (Req->argc > 2) {
 343                 if (!SendErrors)
 344                         return CONNECTED;
 345                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 346                                           Client_ID(Client), Req->command);
 347         }
 348
 349         if (Client_Type(Client) == CLIENT_SERVER)
 350                 from = Client_Search(Req->prefix);
 351         else
 352                 from = Client;
 353         if (!from)
 354                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 355                                           Client_ID(Client), Req->prefix);
 356
 357         /* handle msgtarget = msgto *("," msgto) */
 358         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 359         ngt_UpperStr(Req->command);
 360
 361         while (currentTarget) {
 362                 /* Check for and handle valid <msgto> of form:
 363                  * RFC 2812 2.3.1:
 364                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 365                  *   msgto =/ ( user "%" host ) / targetmask
 366                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 367                  */
 368                 if (strchr(currentTarget, '!') == NULL)
 369                         /* nickname */
 370                         cl = Client_Search(currentTarget);
 371                 else
 372                         cl = NULL;
 373
 374                 if (cl == NULL) {
 375                         /* If currentTarget isn't a nickname check for:
 376                          * user ["%" host] "@" servername
 377                          * user "%" host
 378                          * nickname "!" user "@" host
 379                          */
 380                         char target[COMMAND_LEN];
 381                         char * nick = NULL;
 382                         char * user = NULL;
 383                         char * host = NULL;
 384                         char * server = NULL;
 385
 386                         strlcpy(target, currentTarget, COMMAND_LEN);
 387                         server = strchr(target, '@');
 388                         if (server) {
 389                                 *server = '\0';
 390                                 server++;
 391                         }
 392                         host = strchr(target, '%');
 393                         if (host) {
 394                                 *host = '\0';
 395                                 host++;
 396                         }
 397                         user = strchr(target, '!');
 398                         if (user) {
 399                                 /* msgto form: nick!user@host */
 400                                 *user = '\0';
 401                                 user++;
 402                                 nick = target;
 403                                 host = server; /* not "@server" but "@host" */
 404                         } else {
 405                                 user = target;
 406                         }
 407
 408                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 409                                 if (Client_Type(cl) != CLIENT_USER &&
 410                                     Client_Type(cl) != CLIENT_SERVICE)
 411                                         continue;
 412                                 if (nick != NULL && host != NULL) {
 413                                         if (strcmp(nick, Client_ID(cl)) == 0 &&
 414                                             strcmp(user, Client_User(cl)) == 0 &&
 415                                             strcasecmp(host, Client_HostnameCloaked(cl)) == 0)
 416                                                 break;
 417                                         else
 418                                                 continue;
 419                                 }
 420                                 if (strcasecmp(user, Client_User(cl)) != 0)
 421                                         continue;
 422                                 if (host != NULL && strcasecmp(host,
 423                                                 Client_HostnameCloaked(cl)) != 0)
 424                                         continue;
 425                                 if (server != NULL && strcasecmp(server,
 426                                                 Client_ID(Client_Introducer(cl))) != 0)
 427                                         continue;
 428                                 break;
 429                         }
 430                 }
 431
 432                 if (cl) {
 433                         /* Target is a user, enforce type */
 434 #ifndef STRICT_RFC
 435                         if (Client_Type(cl) != ForceType &&
 436                             !(ForceType == CLIENT_USER &&
 437                               (Client_Type(cl) == CLIENT_USER ||
 438                                Client_Type(cl) == CLIENT_SERVICE))) {
 439 #else
 440                         if (Client_Type(cl) != ForceType) {
 441 #endif
 442                                 if (!SendErrors)
 443                                         return CONNECTED;
 444                                 return IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 445                                                           Client_ID(from),
 446                                                           currentTarget);
 447                         }
 448
 449 #ifndef STRICT_RFC
 450                         if (ForceType == CLIENT_SERVICE &&
 451                             (Conn_Options(Client_Conn(Client_NextHop(cl)))
 452                              & CONN_RFC1459)) {
 453                                 /* SQUERY command but RFC 1459 link: convert
 454                                  * request to PRIVMSG command */
 455                                 Req->command = "PRIVMSG";
 456                         }
 457 #endif
 458
 459                         if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 460                             && strchr(Client_Modes(cl), 'a')) {
 461                                 /* Target is away */
 462                                 if (!IRC_WriteStrClient(from, RPL_AWAY_MSG,
 463                                                         Client_ID(from),
 464                                                         Client_ID(cl),
 465                                                         Client_Away(cl)))
 466                                         return DISCONNECTED;
 467                         }
 468                         if (Client_Conn(from) > NONE) {
 469                                 Conn_UpdateIdle(Client_Conn(from));
 470                         }
 471                         if (!IRC_WriteStrClientPrefix(cl, from, "%s %s :%s",
 472                                                       Req->command, Client_ID(cl),
 473                                                       Req->argv[1]))
 474                                 return DISCONNECTED;
 475                 } else if (ForceType != CLIENT_SERVICE
 476                            && (chan = Channel_Search(currentTarget))) {
 477                         if (!Channel_Write(chan, from, Client, Req->command,
 478                                            SendErrors, Req->argv[1]))
 479                                         return DISCONNECTED;
 480                 } else if (ForceType != CLIENT_SERVICE
 481                         /* $#: server/target mask, RFC 2812, sec. 3.3.1 */
 482                            && strchr("$#", currentTarget[0])
 483                            && strchr(currentTarget, '.')) {
 484                         /* targetmask */
 485                         if (!Send_Message_Mask(from, Req->command, currentTarget,
 486                                                Req->argv[1], SendErrors))
 487                                 return DISCONNECTED;
 488                 } else {
 489                         if (!SendErrors)
 490                                 return CONNECTED;
 491                         if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 492                                                 Client_ID(from), currentTarget))
 493                                 return DISCONNECTED;
 494                 }
 495
 496                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 497                 if (currentTarget)
 498                         Conn_SetPenalty(Client_Conn(Client), 1);
 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- */