1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * create raw socket for icmp protocol test permission
6 * and drop root privileges if running setuid
7 *
8 */
9
10//#include <sys/types.h>
11//#include <netdb.h>
12//#include <sys/socket.h>
13#include "libbb.h"
14
15int create_icmp_socket(void)
16{
17	struct protoent *proto;
18	int sock;
19
20	proto = getprotobyname("icmp");
21	/* if getprotobyname failed, just silently force
22	 * proto->p_proto to have the correct value for "icmp" */
23	sock = socket(AF_INET, SOCK_RAW,
24			(proto ? proto->p_proto : 1)); /* 1 == ICMP */
25	if (sock < 0) {
26		if (errno == EPERM)
27			bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
28		bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
29	}
30
31	/* drop root privs if running setuid */
32	xsetuid(getuid());
33
34	return sock;
35}
36