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/*
* ethers(3N) a la Sun.
*
* Written by Roland McGrath <roland@frob.com> 10/14/93.
* Public domain.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: ethers.c,v 1.3 1996/08/19 08:28:36 tholo Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <sys/param.h>
#include <paths.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef _PATH_ETHERS
#define _PATH_ETHERS "/etc/ethers"
#endif
char *
ether_ntoa(e)
struct ether_addr *e;
{
static char a[] = "xx:xx:xx:xx:xx:xx";
sprintf(a, "%02x:%02x:%02x:%02x:%02x:%02x",
e->ether_addr_octet[0], e->ether_addr_octet[1],
e->ether_addr_octet[2], e->ether_addr_octet[3],
e->ether_addr_octet[4], e->ether_addr_octet[5]);
return a;
}
struct ether_addr *
ether_aton(s)
char *s;
{
static struct ether_addr n;
u_int i[6];
if (sscanf(s, " %x:%x:%x:%x:%x:%x ", &i[0], &i[1],
&i[2], &i[3], &i[4], &i[5]) == 6) {
n.ether_addr_octet[0] = (u_char)i[0];
n.ether_addr_octet[1] = (u_char)i[1];
n.ether_addr_octet[2] = (u_char)i[2];
n.ether_addr_octet[3] = (u_char)i[3];
n.ether_addr_octet[4] = (u_char)i[4];
n.ether_addr_octet[5] = (u_char)i[5];
return &n;
}
return NULL;
}
int
ether_ntohost(hostname, e)
char *hostname;
struct ether_addr *e;
{
FILE *f;
char buf[BUFSIZ];
struct ether_addr try;
#ifdef YP
char trybuf[sizeof "xx:xx:xx:xx:xx:xx"];
int trylen;
sprintf(trybuf, "%x:%x:%x:%x:%x:%x",
e->ether_addr_octet[0], e->ether_addr_octet[1],
e->ether_addr_octet[2], e->ether_addr_octet[3],
e->ether_addr_octet[4], e->ether_addr_octet[5]);
trylen = strlen(trybuf);
#endif
f = fopen(_PATH_ETHERS, "r");
if (f==NULL)
return -1;
while (fgets(buf, sizeof buf, f)) {
#ifdef YP
/* A + in the file means try YP now. */
if (!strncmp(buf, "+\n", sizeof buf)) {
char *ypbuf, *ypdom;
int ypbuflen;
if (yp_get_default_domain(&ypdom))
continue;
if (yp_match(ypdom, "ethers.byaddr", trybuf,
trylen, &ypbuf, &ypbuflen))
continue;
if (ether_line(ypbuf, &try, hostname) == 0) {
free(ypbuf);
(void)fclose(f);
return 0;
}
free(ypbuf);
continue;
}
#endif
if (ether_line(buf, &try, hostname) == 0 &&
bcmp((char *)&try, (char *)e, sizeof try) == 0) {
(void)fclose(f);
return 0;
}
}
(void)fclose(f);
errno = ENOENT;
return -1;
}
int
ether_hostton(hostname, e)
char *hostname;
struct ether_addr *e;
{
FILE *f;
char buf[BUFSIZ];
char try[MAXHOSTNAMELEN];
#ifdef YP
int hostlen = strlen(hostname);
#endif
f = fopen(_PATH_ETHERS, "r");
if (f==NULL)
return -1;
while (fgets(buf, sizeof buf, f)) {
#ifdef YP
/* A + in the file means try YP now. */
if (!strncmp(buf, "+\n", sizeof buf)) {
char *ypbuf, *ypdom;
int ypbuflen;
if (yp_get_default_domain(&ypdom))
continue;
if (yp_match(ypdom, "ethers.byname", hostname, hostlen,
&ypbuf, &ypbuflen))
continue;
if (ether_line(ypbuf, e, try) == 0) {
free(ypbuf);
(void)fclose(f);
return 0;
}
free(ypbuf);
continue;
}
#endif
if (ether_line(buf, e, try) == 0 && strcmp(hostname, try) == 0) {
(void)fclose(f);
return 0;
}
}
(void)fclose(f);
errno = ENOENT;
return -1;
}
int
ether_line(l, e, hostname)
char *l;
struct ether_addr *e;
char *hostname;
{
u_int i[6];
if (sscanf(l, " %x:%x:%x:%x:%x:%x %s\n", &i[0], &i[1],
&i[2], &i[3], &i[4], &i[5], hostname) == 7) {
e->ether_addr_octet[0] = (u_char)i[0];
e->ether_addr_octet[1] = (u_char)i[1];
e->ether_addr_octet[2] = (u_char)i[2];
e->ether_addr_octet[3] = (u_char)i[3];
e->ether_addr_octet[4] = (u_char)i[4];
e->ether_addr_octet[5] = (u_char)i[5];
return 0;
}
errno = EINVAL;
return -1;
}
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