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93 lines
2.8 KiB
93 lines
2.8 KiB
15 years ago
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/*
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* This file is part of the KDE libraries
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* Copyright (c) 2007 Lubos Lunak <l.lunak@kde.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License version 2 as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef KDEINIT_OOM_PROTECT
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/*
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The start_kdeinit wrapper is setuid, which means some shell variables like LD_LIBRARY_PATH
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get unset before it's launched. However kdeinit is used to launch most of KDE, so such variables
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should not be dropped. Therefore this wrapper for the setuid wrapper read the environment
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and writes it to start_kdeinit's stdin, which after dropping priviledges reads it and uses it
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for launching the real kdeinit.
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*/
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int main(int argc, char **argv)
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{
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int pipes[ 2 ];
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if(argc == 0)
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return 1;
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if( pipe( pipes ) < 0 ) {
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perror( "pipe()" );
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return 1;
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}
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switch( fork()) {
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case -1:
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perror( "fork()" );
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return 1;
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default: /* parent, exec */
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close( pipes[ 1 ] );
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close( 0 ); /* stdin */
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dup2( pipes[ 0 ], 0 );
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close( pipes[ 0 ] );
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argv[ 0 ] = (char*)"start_kdeinit";
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execvp("start_kdeinit", argv);
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perror("start_kdeinit");
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return 1;
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case 0: { /* child, pass env and exit */
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extern char** environ;
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int i;
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close( pipes[ 0 ] );
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write( pipes[ 1 ], "environ", 7 ); /* header, just in case */
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for( i = 0;
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environ[ i ] != NULL;
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++i )
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{}
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write( pipes[ 1 ], &i, sizeof( int )); /* write count */
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for( i = 0;
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environ[ i ] != NULL;
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++i )
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{
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int len = strlen( environ[ i ] );
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write( pipes[ 1 ], &len, sizeof( int )); /* write length */
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write( pipes[ 1 ], environ[ i ], strlen( environ[ i ] ));
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}
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close( pipes[ 1 ] );
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}
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}
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return 0;
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}
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#else /* not Linux, the simple non-setuid case */
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int main(int argc, char **argv)
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{
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if(argc == 0)
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return 1;
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argv[0] = "start_kdeinit";
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execvp("start_kdeinit",argv);
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perror("start_kdeinit");
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return 1;
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}
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#endif
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