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#include <sys/types.h>
#include <unistd.h>
main()
{
/* Identify the person logged in (real ID). */
printf("getuid = %d\n", getuid());
/* Get the ID in use by this process (effective ID).
* Normally this is the same as above but if the program is:
*
* o Owned by root (chown root progname).
* o Had 'Set owner' set in the permissions (chmod u+s progname).
* o The disk is not mounted 'nosetuid'.
*
* We can use 'setuid' and 'seteuid'.
*/
printf("geteuid = %d\n", geteuid());
(!geteuid())
?
puts("setuid//setruid/seteuid will work.")
:
puts("setuid/setruid/seteuid will fail.");
/* 0 = OK
* -1 = Fail
*/
/*
printf("seteuid return code = %d\n", seteuid(3570));
printf("getuid = %d\n", getuid());
printf("geteuid = %d\n", geteuid());
printf("seteuid return code = %d\n", seteuid(0));
printf("getuid = %d\n", getuid());
printf("geteuid = %d\n", geteuid());
*/
printf("setuid return code = %d\n", setuid(4261));
printf("getuid = %d\n", getuid());
printf("geteuid = %d\n", geteuid());
}
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