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
  37 #include "exp.h"
  38 #include "irc.h"
  39
  40
  41 static char *Option_String PARAMS((CONN_ID Idx));
  42 static bool Send_Message PARAMS((CLIENT *Client, REQUEST *Req, int ForceType, bool SendErrors));
  43 static bool Send_Message_Mask PARAMS((CLIENT *from, char *targetMask, char *message, bool SendErrors));
  44
  45
  46 GLOBAL bool
  47 IRC_ERROR( CLIENT *Client, REQUEST *Req )
  48 {
  49         assert( Client != NULL );
  50         assert( Req != NULL );
  51
  52         if( Req->argc < 1 ) Log( LOG_NOTICE, "Got ERROR from \"%s\"!", Client_Mask( Client ));
  53         else Log( LOG_NOTICE, "Got ERROR from \"%s\": %s!", Client_Mask( Client ), Req->argv[0] );
  54
  55         return CONNECTED;
  56 } /* IRC_ERROR */
  57
  58
  59 /**
  60  * Kill client on request.
  61  * This function implements the IRC command "KILL" wich is used to selectively
  62  * disconnect clients. It can be used by IRC operators and servers, for example
  63  * to "solve" nick collisions after netsplits.
  64  * Please note that this function is also called internally, without a real
  65  * KILL command beeing received over the network! Client is Client_ThisServer()
  66  * in this case. */
  67 GLOBAL bool
  68 IRC_KILL( CLIENT *Client, REQUEST *Req )
  69 {
  70         CLIENT *prefix, *c;
  71         char reason[COMMAND_LEN], *msg;
  72         CONN_ID my_conn, conn;
  73
  74         assert( Client != NULL );
  75         assert( Req != NULL );
  76
  77         if(( Client_Type( Client ) != CLIENT_SERVER ) &&
  78            ( ! Client_OperByMe( Client )))
  79         {
  80                 /* The originator of the KILL is neither an IRC operator of
  81                  * this server nor a server. */
  82                 return IRC_WriteStrClient( Client, ERR_NOPRIVILEGES_MSG,
  83                                            Client_ID( Client ));
  84         }
  85
  86         if( Req->argc != 2 )
  87         {
  88                 /* This command requires exactly 2 parameters! */
  89                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
  90                                            Client_ID( Client ), Req->command );
  91         }
  92
  93         if( Req->prefix ) prefix = Client_Search( Req->prefix );
  94         else prefix = Client;
  95         if( ! prefix )
  96         {
  97                 Log( LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
  98                      Req->prefix );
  99                 prefix = Client_ThisServer( );
 100         }
 101
 102         if( Client != Client_ThisServer( ))
 103         {
 104                 /* This is a "real" KILL received from the network. */
 105                 Log( LOG_NOTICE|LOG_snotice, "Got KILL command from \"%s\" for \"%s\": %s",
 106                      Client_Mask( prefix ), Req->argv[0], Req->argv[1] );
 107         }
 108
 109         /* Build reason string */
 110         if( Client_Type( Client ) == CLIENT_USER )
 111         {
 112                 /* Prefix the "reason" if the originator is a regular user,
 113                  * so users can't spoof KILLs of servers. */
 114                 snprintf( reason, sizeof( reason ), "KILLed by %s: %s",
 115                           Client_ID( Client ), Req->argv[1] );
 116         }
 117         else
 118                 strlcpy( reason, Req->argv[1], sizeof( reason ));
 119
 120         /* Inform other servers */
 121         IRC_WriteStrServersPrefix( Client, prefix, "KILL %s :%s",
 122                                    Req->argv[0], reason );
 123
 124         /* Save ID of this connection */
 125         my_conn = Client_Conn( Client );
 126
 127         /* Do we host such a client? */
 128         c = Client_Search( Req->argv[0] );
 129         if( c )
 130         {
 131                 if(( Client_Type( c ) != CLIENT_USER ) &&
 132                    ( Client_Type( c ) != CLIENT_GOTNICK ))
 133                 {
 134                         /* Target of this KILL is not a regular user, this is
 135                          * invalid! So we ignore this case if we received a
 136                          * regular KILL from the network and try to kill the
 137                          * client/connection anyway (but log an error!) if the
 138                          * origin is the local server. */
 139
 140                         if( Client != Client_ThisServer( ))
 141                         {
 142                                 /* Invalid KILL received from remote */
 143                                 if( Client_Type( c ) == CLIENT_SERVER )
 144                                         msg = ERR_CANTKILLSERVER_MSG;
 145                                 else
 146                                         msg = ERR_NOPRIVILEGES_MSG;
 147                                 return IRC_WriteStrClient( Client, msg,
 148                                         Client_ID( Client ));
 149                         }
 150
 151                         Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
 152                              Client_Type( c ), Req->argv[0] );
 153                 }
 154
 155                 /* Kill client NOW! */
 156                 conn = Client_Conn( c );
 157                 Client_Destroy( c, NULL, reason, false );
 158                 if( conn > NONE )
 159                         Conn_Close( conn, NULL, reason, true );
 160         }
 161         else
 162                 Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
 163
 164         /* Are we still connected or were we killed, too? */
 165         if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
 166                 return CONNECTED;
 167         else
 168                 return DISCONNECTED;
 169 } /* IRC_KILL */
 170
 171
 172 GLOBAL bool
 173 IRC_NOTICE( CLIENT *Client, REQUEST *Req )
 174 {
 175         return Send_Message(Client, Req, CLIENT_USER, false);
 176 } /* IRC_NOTICE */
 177
 178
 179 /**
 180  * Handler for the IRC command PRIVMSG.
 181  */
 182 GLOBAL bool
 183 IRC_PRIVMSG(CLIENT *Client, REQUEST *Req)
 184 {
 185         return Send_Message(Client, Req, CLIENT_USER, true);
 186 } /* IRC_PRIVMSG */
 187
 188
 189 /**
 190  * Handler for the IRC command SQUERY.
 191  */
 192 GLOBAL bool
 193 IRC_SQUERY(CLIENT *Client, REQUEST *Req)
 194 {
 195         return Send_Message(Client, Req, CLIENT_SERVICE, true);
 196 } /* IRC_SQUERY */
 197
 198
 199 GLOBAL bool
 200 IRC_TRACE( CLIENT *Client, REQUEST *Req )
 201 {
 202         CLIENT *from, *target, *c;
 203         CONN_ID idx, idx2;
 204         char user[CLIENT_USER_LEN];
 205
 206         assert( Client != NULL );
 207         assert( Req != NULL );
 208
 209         /* Bad number of arguments? */
 210         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 211
 212         /* Search sender */
 213         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 214         else from = Client;
 215         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 216
 217         /* Search target */
 218         if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
 219         else target = Client_ThisServer( );
 220
 221         /* Forward command to other server? */
 222         if( target != Client_ThisServer( ))
 223         {
 224                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
 225
 226                 /* Send RPL_TRACELINK back to initiator */
 227                 idx = Client_Conn( Client ); assert( idx > NONE );
 228                 idx2 = Client_Conn( Client_NextHop( target )); assert( idx2 > NONE );
 229                 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;
 230
 231                 /* Forward command */
 232                 IRC_WriteStrClientPrefix( target, from, "TRACE %s", Req->argv[0] );
 233                 return CONNECTED;
 234         }
 235
 236         /* Infos about all connected servers */
 237         c = Client_First( );
 238         while( c )
 239         {
 240                 if( Client_Conn( c ) > NONE )
 241                 {
 242                         /* Local client */
 243                         if( Client_Type( c ) == CLIENT_SERVER )
 244                         {
 245                                 /* Server link */
 246                                 strlcpy( user, Client_User( c ), sizeof( user ));
 247                                 if( user[0] == '~' ) strlcpy( user, "unknown", sizeof( user ));
 248                                 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;
 249                         }
 250                         if(( Client_Type( c ) == CLIENT_USER ) && ( strchr( Client_Modes( c ), 'o' )))
 251                         {
 252                                 /* IRC Operator */
 253                                 if( ! IRC_WriteStrClient( from, RPL_TRACEOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
 254                         }
 255                 }
 256                 c = Client_Next( c );
 257         }
 258
 259         IRC_SetPenalty( Client, 3 );
 260         return IRC_WriteStrClient( from, RPL_TRACEEND_MSG, Client_ID( from ), Conf_ServerName, PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_DebugLevel );
 261 } /* IRC_TRACE */
 262
 263
 264 GLOBAL bool
 265 IRC_HELP( CLIENT *Client, REQUEST *Req )
 266 {
 267         COMMAND *cmd;
 268
 269         assert( Client != NULL );
 270         assert( Req != NULL );
 271
 272         /* Bad number of arguments? */
 273         if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 274
 275         cmd = Parse_GetCommandStruct( );
 276         while( cmd->name )
 277         {
 278                 if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
 279                 cmd++;
 280         }
 281
 282         IRC_SetPenalty( Client, 2 );
 283         return CONNECTED;
 284 } /* IRC_HELP */
 285
 286
 287 static char *
 288 Option_String( CONN_ID Idx )
 289 {
 290         static char option_txt[8];
 291         UINT16 options;
 292
 293         options = Conn_Options(Idx);
 294
 295         strcpy(option_txt, "F");        /* No idea what this means, but the
 296                                          * original ircd sends it ... */
 297 #ifdef ZLIB
 298         if(options & CONN_ZIP)          /* zlib compression supported. */
 299                 strcat(option_txt, "z");
 300 #endif
 301
 302         return option_txt;
 303 } /* Option_String */
 304
 305
 306 static bool
 307 Send_Message(CLIENT * Client, REQUEST * Req, int ForceType, bool SendErrors)
 308 {
 309         CLIENT *cl, *from;
 310         CHANNEL *chan;
 311         char *currentTarget = Req->argv[0];
 312         char *lastCurrentTarget;
 313
 314         assert(Client != NULL);
 315         assert(Req != NULL);
 316
 317         if (Req->argc == 0) {
 318                 if (!SendErrors)
 319                         return true;
 320                 return IRC_WriteStrClient(Client, ERR_NORECIPIENT_MSG,
 321                                           Client_ID(Client), Req->command);
 322         }
 323         if (Req->argc == 1) {
 324                 if (!SendErrors)
 325                         return true;
 326                 return IRC_WriteStrClient(Client, ERR_NOTEXTTOSEND_MSG,
 327                                           Client_ID(Client));
 328         }
 329         if (Req->argc > 2) {
 330                 if (!SendErrors)
 331                         return true;
 332                 return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
 333                                           Client_ID(Client), Req->command);
 334         }
 335
 336         if (Client_Type(Client) == CLIENT_SERVER)
 337                 from = Client_Search(Req->prefix);
 338         else
 339                 from = Client;
 340         if (!from) {
 341                 return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
 342                                           Client_ID(Client), Req->prefix);
 343         }
 344
 345         /* handle msgtarget = msgto *("," msgto) */
 346         currentTarget = strtok_r(currentTarget, ",", &lastCurrentTarget);
 347
 348         while (currentTarget) {
 349                 /* Check for and handle valid <msgto> of form:
 350                  * RFC 2812 2.3.1:
 351                  *   msgto =  channel / ( user [ "%" host ] "@" servername )
 352                  *   msgto =/ ( user "%" host ) / targetmask
 353                  *   msgto =/ nickname / ( nickname "!" user "@" host )
 354                  */
 355                 if (strchr(currentTarget, '!') == NULL)
 356                         /* nickname */
 357                         cl = Client_Search(currentTarget);
 358                 else
 359                         cl = NULL;
 360
 361                 if (cl == NULL) {
 362                         /* If currentTarget isn't a nickname check for:
 363                          * user ["%" host] "@" servername
 364                          * user "%" host
 365                          * nickname "!" user "@" host
 366                          */
 367                         char target[COMMAND_LEN];
 368                         char * nick = NULL;
 369                         char * user = NULL;
 370                         char * host = NULL;
 371                         char * server = NULL;
 372
 373                         strlcpy(target, currentTarget, COMMAND_LEN);
 374                         server = strchr(target, '@');
 375                         if (server) {
 376                                 *server = '\0';
 377                                 server++;
 378                         }
 379                         host = strchr(target, '%');
 380                         if (host) {
 381                                 *host = '\0';
 382                                 host++;
 383                         }
 384                         user = strchr(target, '!');
 385                         if (user) {
 386                                 /* msgto form: nick!user@host */
 387                                 *user = '\0';
 388                                 user++;
 389                                 nick = target;
 390                                 host = server; /* not "@server" but "@host" */
 391                         } else {
 392                                 user = target;
 393                         }
 394
 395                         for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 396                                 if (Client_Type(cl) != CLIENT_USER)
 397                                         continue;
 398                                 if (nick != NULL) {
 399                                         if (strcmp(nick, Client_ID(cl)) == 0 &&
 400                                                         strcmp(user, Client_User(cl)) == 0 &&
 401                                                         strcasecmp(host, Client_Hostname(cl)) == 0)
 402                                                 break;
 403                                         else
 404                                                 continue;
 405                                 }
 406                                 if (strcasecmp(user, Client_User(cl)) != 0)
 407                                         continue;
 408                                 if (host != NULL && strcasecmp(host, Client_Hostname(cl)) != 0)
 409                                         continue;
 410                                 if (server != NULL && strcasecmp(server,
 411                                                 Client_ID(Client_Introducer(cl))) != 0)
 412                                         continue;
 413                                 break;
 414                         }
 415                 }
 416
 417                 if (cl) {
 418                         /* Target is a user, enforce type */
 419                         if (Client_Type(cl) != ForceType) {
 420                                 if (!SendErrors)
 421                                         return true;
 422                                 if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 423                                                           Client_ID(from),
 424                                                           currentTarget))
 425                                         return false;
 426                         } else if (SendErrors && (Client_Type(Client) != CLIENT_SERVER)
 427                                                 && strchr(Client_Modes(cl), 'a')) {
 428                                 /* Target is away */
 429                                 if (!SendErrors)
 430                                         return true;
 431                                 if (!IRC_WriteStrClient
 432                                     (from, RPL_AWAY_MSG, Client_ID(from), Client_ID(cl),
 433                                      Client_Away(cl)))
 434                                         return DISCONNECTED;
 435                         }
 436                         if (Client_Conn(from) > NONE) {
 437                                 Conn_UpdateIdle(Client_Conn(from));
 438                         }
 439                         if (!IRC_WriteStrClientPrefix(cl, from, "PRIVMSG %s :%s",
 440                                                 Client_ID(cl), Req->argv[1]))
 441                                 return false;
 442                 } else if (strchr("$#", currentTarget[0]) && strchr(currentTarget, '.')) {
 443                         /* targetmask */
 444                         if (!Send_Message_Mask(from, currentTarget, Req->argv[1],
 445                                         SendErrors))
 446                                 return false;
 447                 } else if ((chan = Channel_Search(currentTarget))) {
 448                         /* channel */
 449                         if (!Channel_Write(chan, from, Client, Req->argv[1]))
 450                                 return false;
 451                 } else {
 452                         if (!SendErrors)
 453                                 return true;
 454                         if (!IRC_WriteStrClient(from, ERR_NOSUCHNICK_MSG,
 455                                                 Client_ID(from), currentTarget))
 456                                 return false;
 457                 }
 458
 459                 currentTarget = strtok_r(NULL, ",", &lastCurrentTarget);
 460         }
 461
 462         return CONNECTED;
 463
 464 } /* Send_Message */
 465
 466
 467 static bool
 468 Send_Message_Mask(CLIENT * from, char * targetMask, char * message, bool SendErrors)
 469 {
 470         CLIENT *cl;
 471         bool client_match;
 472         char *mask = targetMask + 1;
 473
 474         cl = NULL;
 475
 476         if (strchr(Client_Modes(from), 'o') == NULL) {
 477                 if (!SendErrors)
 478                         return true;
 479                 return IRC_WriteStrClient(from, ERR_NOPRIVILEGES_MSG, Client_ID(from));
 480         }
 481
 482         if (targetMask[0] == '#') {
 483                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 484                         if (Client_Type(cl) != CLIENT_USER)
 485                                 continue;
 486                         client_match = MatchCaseInsensitive(mask, Client_Hostname(cl));
 487                         if (client_match)
 488                                 if (!IRC_WriteStrClientPrefix(cl, from, "PRIVMSG %s :%s",
 489                                                 Client_ID(cl), message))
 490                                         return false;
 491                 }
 492         } else {
 493                 for (cl = Client_First(); cl != NULL; cl = Client_Next(cl)) {
 494                         if (Client_Type(cl) != CLIENT_USER)
 495                                 continue;
 496                         client_match = MatchCaseInsensitive(mask,
 497                                         Client_ID(Client_Introducer(cl)));
 498                         if (client_match)
 499                                 if (!IRC_WriteStrClientPrefix(cl, from, "PRIVMSG %s :%s",
 500                                                 Client_ID(cl), message))
 501                                         return false;
 502                 }
 503         }
 504         return CONNECTED;
 505 } /* Send_Message_Mask */
 506
 507
 508 /* -eof- */