busybox/libbb/create_icmp_socket.c
2007-03-07 09:35:43 +00:00

36 lines
779 B
C

/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* create raw socket for icmp protocol test permission
* and drop root privileges if running setuid
*
*/
#include <sys/types.h>
#include <netdb.h>
#include <sys/socket.h>
#include "libbb.h"
int create_icmp_socket(void)
{
struct protoent *proto;
int sock;
proto = getprotobyname("icmp");
/* if getprotobyname failed, just silently force
* proto->p_proto to have the correct value for "icmp" */
sock = socket(AF_INET, SOCK_RAW,
(proto ? proto->p_proto : 1)); /* 1 == ICMP */
if (sock < 0) {
if (errno == EPERM)
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
}
/* drop root privs if running setuid */
xsetuid(getuid());
return sock;
}