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ioexec.cc

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#include <sys/io.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>


int main(int argc, char * const *argv)
{
  int uid, euid;
  uid = getuid();
  euid = geteuid();
  fprintf(stderr,"ioexec : uid=%d\n",uid);
  fprintf(stderr,"ioexec : euid=%d\n",euid);
  if(argc < 2)
    {
      fprintf(stderr,"ioexec: <CMD> . . .\n");
      exit(-1);
    }
  char * const * args = NULL;
  if(argc > 2)
    {
      args = argv+1;
    }
  if(iopl(3))
    {
      fprintf(stderr,"iopl(3): %s\n",strerror(errno));
      exit(-1);
    }
  if(uid != 0 && euid == 0)
    {
      setreuid(uid,uid);
    }
  if(execv(argv[1],args) < 0)
    {
      fprintf(stderr,"execv(%s, .  . .): %s\n",argv[1],strerror(errno));
      exit(-1);
    }
}

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