hush/libbb/create_icmp_socket.c
Eric Andersen 7467c8d3b6 Patch from vodz:
Changed email address
    cmdedit API change
    optimizations for traceroute and md5sum
    added a new shared create_icmp_socket() function
2001-07-12 20:26:32 +00:00

38 lines
819 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)
error_msg_and_die("permission denied. (are you root?)");
else
perror_msg_and_die(can_not_create_raw_socket);
}
/* drop root privs if running setuid */
setuid(getuid());
return sock;
}