#include <dnet.h>
#include <stdio.h>
#include <pwd.h>
#include <grp.h>

void
_droppriv(char *user, int do_chroot, char *chroot_path)
{
	struct passwd   *pw;

	pw = getpwnam(user);
	if (!pw)
		err(1, "unknown user %s", user);
	if (do_chroot) {
		if (!chroot_path)
			chroot_path = pw->pw_dir;
		if (chroot(chroot_path) != 0)
			err(1, "unable to chroot");
	}
	if (chdir("/") != 0)
		err(1, "unable to chdir");
	if (setgroups(1, &pw->pw_gid) == -1)
		err(1, "setgroups() failed");
	if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1)
		err(1, "setresgid failed");
	if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
		err(1, "setresuid() failed");
	endpwent();
}

int
main(int argc, char **argv) {
	intf_t *intf;
	struct addr dst;
	struct intf_entry entry;
	int err;

	if (argc != 2) {
		printf("usage: %s <ip>\n", argv[0]);
		return 1;
	}
	addr_aton(argv[1], &dst);
	printf("dst: %s\n", addr_ntoa(&dst));

	_droppriv("nobody", 1, NULL); /* bad practise, use dedicated user */

	intf = intf_open();

	err = intf_get_dst(intf, &entry, &dst);
	if (err < 0) {
		printf("intf_get_dst error !\n");
		return 2;
	}

	printf("entry:\n");
	printf("  intf_name: %s\n", entry.intf_name);
	printf("  intf_addr: %s\n", addr_ntoa(&entry.intf_addr));
	printf("  intf_link_addr: %s\n", addr_ntoa(&entry.intf_link_addr));

	return 0;
}