1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * create raw socket for icmp protocol
6 * and drop root privileges if running setuid
7 *
8 * Licensed under GPLv2, see file LICENSE in this tarball for details.
9 */
10
11#include "libbb.h"
12
13int FAST_FUNC create_icmp_socket(void)
14{
15	int sock;
16#if 0
17	struct protoent *proto;
18	proto = getprotobyname("icmp");
19	/* if getprotobyname failed, just silently force
20	 * proto->p_proto to have the correct value for "icmp" */
21	sock = socket(AF_INET, SOCK_RAW,
22			(proto ? proto->p_proto : 1)); /* 1 == ICMP */
23#else
24	sock = socket(AF_INET, SOCK_RAW, 1); /* 1 == ICMP */
25#endif
26	if (sock < 0) {
27		if (errno == EPERM)
28			bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
29		bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
30	}
31
32	/* drop root privs if running setuid */
33	xsetuid(getuid());
34
35	return sock;
36}
37