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  1. /*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis
  2.  *
  3.  *  This program is free software; you can redistribute it and/or modify
  4.  *  it under the terms of the GNU General Public License as published by
  5.  *  the Free Software Foundation; either version 2 of the License, or
  6.  *  (at your option) any later version.
  7.  *
  8.  *  This program is distributed in the hope that it will be useful,
  9.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11.  *  GNU General Public License for more details.
  12.  *
  13.  *  You should have received a copy of the GNU General Public License
  14.  *  along with this program; if not, write to the Free Software
  15.  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16.  */
  17.  
  18. /* Wrap uid and exec */
  19.  
  20. #include <unistd.h>
  21. #include <string.h>
  22. #include <assert.h>
  23.  
  24. int main(int argc,char *argv[])
  25. {
  26.     char *args[1024];
  27.     int i, uid1, uid2, gid1, gid2;
  28.  
  29.     if(argc<2) return 0;
  30.     for(i=0;i<1000 && i<argc; i++) args[i]=argv[i+1];
  31.     args[i]=NULL;
  32.     uid1=geteuid(); uid2=getuid(); gid1=getegid(); gid2=getgid();
  33.     if(strchr(args[0],'/')) {
  34.       assert(setreuid(uid1,uid2)==0);
  35.       assert(setregid(gid1,gid2)==0);
  36.       execv(args[0],args);
  37.     }
  38.     else {
  39.       assert(setreuid(uid1,uid1)==0);
  40.       assert(setregid(gid1,gid1)==0);
  41.       execvp(args[0],args);
  42.     }
  43.     return 127;
  44. }
  45.  
  46.