38 lines
827 B
C
38 lines
827 B
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Utility routines.
|
|
*
|
|
* create raw socket for icmp protocol test permision
|
|
* and drop root privilegies if running setuid
|
|
*
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <netdb.h>
|
|
#include <sys/socket.h>
|
|
#include <errno.h>
|
|
#include <unistd.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" */
|
|
if ((sock = socket(AF_INET, SOCK_RAW,
|
|
(proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */
|
|
if (errno == EPERM)
|
|
bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
|
|
else
|
|
bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
|
|
}
|
|
|
|
/* drop root privs if running setuid */
|
|
setuid(getuid());
|
|
|
|
return sock;
|
|
}
|