/*
 * This is a simple script meant to help debug scripts supposed to run in chroot.
 * stuff run in chroot usually isn't run as root, but it can be hard to debug
 * such stuff. By using this small util you can execute what you want, with the
 * uid of your choice.
 *
 * How to compile:
 * gcc -static -o /glftpd/bin/droproot droproot.c
 *
 * How to run:
 * chroot /glftpd /bin/droproot <number> "something to run"
 *
 * Number must be between 1 and 65535.
 * The "" is only needed if you wish to pass args to the script you wish to
 * test.
 * Examples:
 * chroot /glftpd /bin/droproot 200 /bin/my_script.sh             <- valid - no args
 * chroot /glftpd /bin/droproot 200 /bin/my_script.sh l33tuser    <- invalid - arg will not be passed.
 * chroot /glftpd /bin/droproot 200 "/bin/my_script.sh l33tuser"  <- valid - arg will be passed.
 */

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int main(int argc, char **argv) {

        int number;
        if ( argc < 3 ) {
                printf("syntax: %s <number> \"<command to run>\"\n", argv[0]);
                return 1;
        }
        number = atoi(argv[1]);
        if ( number <1 || number >65535 ) {
                printf("syntax: %s <number> \"<command to run>\"\n", argv[0]);
                printf("<number> must be between 1 and 65535\n");
                return 1;
        }
        setuid(number);
        setgid(number);
        seteuid(number);
        setegid(number);

        return system(argv[2]);
}