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 "messages.h"
  34 #include "parse.h"
  35
  36 #include "exp.h"
  37 #include "irc.h"
  38
  39
  40 static char *Option_String PARAMS(( CONN_ID Idx ));
  41
  42
  43 GLOBAL bool
  44 IRC_ERROR( CLIENT *Client, REQUEST *Req )
  45 {
  46         assert( Client != NULL );
  47         assert( Req != NULL );
  48
  49         if( Req->argc < 1 ) Log( LOG_NOTICE, "Got ERROR from \"%s\"!", Client_Mask( Client ));
  50         else Log( LOG_NOTICE, "Got ERROR from \"%s\": %s!", Client_Mask( Client ), Req->argv[0] );
  51
  52         return CONNECTED;
  53 } /* IRC_ERROR */
  54
  55
  56 /**
  57  * Kill client on request.
  58  * This function implements the IRC command "KILL" wich is used to selectively
  59  * disconnect clients. It can be used by IRC operators and servers, for example
  60  * to "solve" nick collisions after netsplits.
  61  * Please note that this function is also called internally, without a real
  62  * KILL command beeing received over the network! Client is Client_ThisServer()
  63  * in this case. */
  64 GLOBAL bool
  65 IRC_KILL( CLIENT *Client, REQUEST *Req )
  66 {
  67         CLIENT *prefix, *c;
  68         char reason[COMMAND_LEN], *msg;
  69         CONN_ID my_conn, conn;
  70
  71         assert( Client != NULL );
  72         assert( Req != NULL );
  73
  74         if(( Client_Type( Client ) != CLIENT_SERVER ) &&
  75            ( ! Client_OperByMe( Client )))
  76         {
  77                 /* The originator of the KILL is neither an IRC operator of
  78                  * this server nor a server. */
  79                 return IRC_WriteStrClient( Client, ERR_NOPRIVILEGES_MSG,
  80                                            Client_ID( Client ));
  81         }
  82
  83         if( Req->argc != 2 )
  84         {
  85                 /* This command requires exactly 2 parameters! */
  86                 return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
  87                                            Client_ID( Client ), Req->command );
  88         }
  89
  90         if( Req->prefix ) prefix = Client_Search( Req->prefix );
  91         else prefix = Client;
  92         if( ! prefix )
  93         {
  94                 Log( LOG_WARNING, "Got KILL with invalid prefix: \"%s\"!",
  95                      Req->prefix );
  96                 prefix = Client_ThisServer( );
  97         }
  98
  99         if( Client != Client_ThisServer( ))
 100         {
 101                 /* This is a "real" KILL received from the network. */
 102                 Log( LOG_NOTICE|LOG_snotice, "Got KILL command from \"%s\" for \"%s\": %s",
 103                      Client_Mask( prefix ), Req->argv[0], Req->argv[1] );
 104         }
 105
 106         /* Build reason string */
 107         if( Client_Type( Client ) == CLIENT_USER )
 108         {
 109                 /* Prefix the "reason" if the originator is a regular user,
 110                  * so users can't spoof KILLs of servers. */
 111                 snprintf( reason, sizeof( reason ), "KILLed by %s: %s",
 112                           Client_ID( Client ), Req->argv[1] );
 113         }
 114         else
 115                 strlcpy( reason, Req->argv[1], sizeof( reason ));
 116
 117         /* Inform other servers */
 118         IRC_WriteStrServersPrefix( Client, prefix, "KILL %s :%s",
 119                                    Req->argv[0], reason );
 120
 121         /* Save ID of this connection */
 122         my_conn = Client_Conn( Client );
 123
 124         /* Do we host such a client? */
 125         c = Client_Search( Req->argv[0] );
 126         if( c )
 127         {
 128                 if(( Client_Type( c ) != CLIENT_USER ) &&
 129                    ( Client_Type( c ) != CLIENT_GOTNICK ))
 130                 {
 131                         /* Target of this KILL is not a regular user, this is
 132                          * invalid! So we ignore this case if we received a
 133                          * regular KILL from the network and try to kill the
 134                          * client/connection anyway (but log an error!) if the
 135                          * origin is the local server. */
 136
 137                         if( Client != Client_ThisServer( ))
 138                         {
 139                                 /* Invalid KILL received from remote */
 140                                 if( Client_Type( c ) == CLIENT_SERVER )
 141                                         msg = ERR_CANTKILLSERVER_MSG;
 142                                 else
 143                                         msg = ERR_NOPRIVILEGES_MSG;
 144                                 return IRC_WriteStrClient( Client, msg,
 145                                         Client_ID( Client ));
 146                         }
 147
 148                         Log( LOG_ERR, "Got KILL for invalid client type: %d, \"%s\"!",
 149                              Client_Type( c ), Req->argv[0] );
 150                 }
 151
 152                 /* Kill client NOW! */
 153                 conn = Client_Conn( c );
 154                 Client_Destroy( c, NULL, reason, false );
 155                 if( conn > NONE )
 156                         Conn_Close( conn, NULL, reason, true );
 157         }
 158         else
 159                 Log( LOG_NOTICE, "Client with nick \"%s\" is unknown here.", Req->argv[0] );
 160
 161         /* Are we still connected or were we killed, too? */
 162         if(( my_conn > NONE ) && ( Conn_GetClient( my_conn )))
 163                 return CONNECTED;
 164         else
 165                 return DISCONNECTED;
 166 } /* IRC_KILL */
 167
 168
 169 GLOBAL bool
 170 IRC_NOTICE( CLIENT *Client, REQUEST *Req )
 171 {
 172         CLIENT *to, *from;
 173         CHANNEL *chan;
 174
 175         assert( Client != NULL );
 176         assert( Req != NULL );
 177
 178         if(( Client_Type( Client ) != CLIENT_USER ) && ( Client_Type( Client ) != CLIENT_SERVER )) return CONNECTED;
 179
 180         /* Falsche Anzahl Parameter? */
 181         if( Req->argc != 2 ) return CONNECTED;
 182
 183         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 184         else from = Client;
 185         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 186
 187         to = Client_Search( Req->argv[0] );
 188         if(( to ) && ( Client_Type( to ) == CLIENT_USER ))
 189         {
 190                 /* Okay, Ziel ist ein User */
 191                 return IRC_WriteStrClientPrefix( to, from, "NOTICE %s :%s", Client_ID( to ), Req->argv[1] );
 192         }
 193         else
 194         {
 195                 chan = Channel_Search(Req->argv[0]);
 196                 if (chan)
 197                         return Channel_Notice(chan, from, Client, Req->argv[1]);
 198         }
 199
 200         return CONNECTED;
 201 } /* IRC_NOTICE */
 202
 203
 204 GLOBAL bool
 205 IRC_PRIVMSG( CLIENT *Client, REQUEST *Req )
 206 {
 207         CLIENT *cl, *from;
 208         CHANNEL *chan;
 209
 210         assert( Client != NULL );
 211         assert( Req != NULL );
 212
 213         /* Falsche Anzahl Parameter? */
 214         if( Req->argc == 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 215         if( Req->argc == 1 ) return IRC_WriteStrClient( Client, ERR_NOTEXTTOSEND_MSG, Client_ID( Client ));
 216         if( Req->argc > 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 217
 218         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 219         else from = Client;
 220         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 221
 222         cl = Client_Search( Req->argv[0] );
 223         if( cl )
 224         {
 225                 /* Okay, Ziel ist ein Client. Aber ist es auch ein User? */
 226                 if( Client_Type( cl ) != CLIENT_USER ) return IRC_WriteStrClient( from, ERR_NOSUCHNICK_MSG, Client_ID( from ), Req->argv[0] );
 227
 228                 /* Okay, Ziel ist ein User */
 229                 if(( Client_Type( Client ) != CLIENT_SERVER ) && ( strchr( Client_Modes( cl ), 'a' )))
 230                 {
 231                         /* Ziel-User ist AWAY: Meldung verschicken */
 232                         if( ! IRC_WriteStrClient( from, RPL_AWAY_MSG, Client_ID( from ), Client_ID( cl ), Client_Away( cl ))) return DISCONNECTED;
 233                 }
 234
 235                 /* Text senden */
 236                 if( Client_Conn( from ) > NONE ) Conn_UpdateIdle( Client_Conn( from ));
 237                 return IRC_WriteStrClientPrefix( cl, from, "PRIVMSG %s :%s", Client_ID( cl ), Req->argv[1] );
 238         }
 239
 240         chan = Channel_Search( Req->argv[0] );
 241         if( chan ) return Channel_Write( chan, from, Client, Req->argv[1] );
 242
 243         return IRC_WriteStrClient( from, ERR_NOSUCHNICK_MSG, Client_ID( from ), Req->argv[0] );
 244 } /* IRC_PRIVMSG */
 245
 246
 247 GLOBAL bool
 248 IRC_TRACE( CLIENT *Client, REQUEST *Req )
 249 {
 250         CLIENT *from, *target, *c;
 251         CONN_ID idx, idx2;
 252         char user[CLIENT_USER_LEN];
 253
 254         assert( Client != NULL );
 255         assert( Req != NULL );
 256
 257         /* Bad number of arguments? */
 258         if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 259
 260         /* Search sender */
 261         if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 262         else from = Client;
 263         if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 264
 265         /* Search target */
 266         if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
 267         else target = Client_ThisServer( );
 268
 269         /* Forward command to other server? */
 270         if( target != Client_ThisServer( ))
 271         {
 272                 if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
 273
 274                 /* Send RPL_TRACELINK back to initiator */
 275                 idx = Client_Conn( Client ); assert( idx > NONE );
 276                 idx2 = Client_Conn( Client_NextHop( target )); assert( idx2 > NONE );
 277                 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;
 278
 279                 /* Forward command */
 280                 IRC_WriteStrClientPrefix( target, from, "TRACE %s", Req->argv[0] );
 281                 return CONNECTED;
 282         }
 283
 284         /* Infos about all connected servers */
 285         c = Client_First( );
 286         while( c )
 287         {
 288                 if( Client_Conn( c ) > NONE )
 289                 {
 290                         /* Local client */
 291                         if( Client_Type( c ) == CLIENT_SERVER )
 292                         {
 293                                 /* Server link */
 294                                 strlcpy( user, Client_User( c ), sizeof( user ));
 295                                 if( user[0] == '~' ) strlcpy( user, "unknown", sizeof( user ));
 296                                 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;
 297                         }
 298                         if(( Client_Type( c ) == CLIENT_USER ) && ( strchr( Client_Modes( c ), 'o' )))
 299                         {
 300                                 /* IRC Operator */
 301                                 if( ! IRC_WriteStrClient( from, RPL_TRACEOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
 302                         }
 303                 }
 304                 c = Client_Next( c );
 305         }
 306
 307         IRC_SetPenalty( Client, 3 );
 308         return IRC_WriteStrClient( from, RPL_TRACEEND_MSG, Client_ID( from ), Conf_ServerName, PACKAGE_NAME, PACKAGE_VERSION, NGIRCd_DebugLevel );
 309 } /* IRC_TRACE */
 310
 311
 312 GLOBAL bool
 313 IRC_HELP( CLIENT *Client, REQUEST *Req )
 314 {
 315         COMMAND *cmd;
 316
 317         assert( Client != NULL );
 318         assert( Req != NULL );
 319
 320         /* Bad number of arguments? */
 321         if( Req->argc > 0 ) return IRC_WriteStrClient( Client, ERR_NORECIPIENT_MSG, Client_ID( Client ), Req->command );
 322
 323         cmd = Parse_GetCommandStruct( );
 324         while( cmd->name )
 325         {
 326                 if( ! IRC_WriteStrClient( Client, "NOTICE %s :%s", Client_ID( Client ), cmd->name )) return DISCONNECTED;
 327                 cmd++;
 328         }
 329
 330         IRC_SetPenalty( Client, 2 );
 331         return CONNECTED;
 332 } /* IRC_HELP */
 333
 334
 335 static char *
 336 Option_String( CONN_ID Idx )
 337 {
 338         static char option_txt[8];
 339         UINT16 options;
 340
 341         options = Conn_Options(Idx);
 342
 343         strcpy(option_txt, "F");        /* No idea what this means, but the
 344                                          * original ircd sends it ... */
 345 #ifdef ZLIB
 346         if(options & CONN_ZIP)          /* zlib compression supported. */
 347                 strcat(option_txt, "z");
 348 #endif
 349
 350         return option_txt;
 351 } /* Option_String */
 352
 353
 354 /* -eof- */