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/* $NetBSD: ethers.c,v 1.25 2014/09/18 13:58:20 christos Exp $ */
/*
* ethers(3N) a la Sun.
*
* Written by Roland McGrath <roland@frob.com> 10/14/93.
* Public domain.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: ethers.c,v 1.25 2014/09/18 13:58:20 christos Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_ether.h>
#include <netinet/in.h>
#include <assert.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef YP
#include <rpcsvc/ypclnt.h>
#endif
#ifdef __weak_alias
__weak_alias(ether_aton,_ether_aton)
__weak_alias(ether_hostton,_ether_hostton)
__weak_alias(ether_line,_ether_line)
__weak_alias(ether_ntoa,_ether_ntoa)
__weak_alias(ether_ntohost,_ether_ntohost)
#endif
#ifndef _PATH_ETHERS
#define _PATH_ETHERS "/etc/ethers"
#endif
char *
ether_ntoa(const struct ether_addr *e)
{
static char a[18];
_DIAGASSERT(e != NULL);
(void) snprintf(a, sizeof 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(const char *s)
{
static struct ether_addr n;
u_int i[6];
_DIAGASSERT(s != NULL);
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(char *hostname, const struct ether_addr *e)
{
FILE *f;
char *p;
struct ether_addr try;
_DIAGASSERT(hostname != NULL);
_DIAGASSERT(e != NULL);
#ifdef YP
char trybuf[sizeof "xx:xx:xx:xx:xx:xx"];
int trylen;
trylen = snprintf(trybuf, sizeof 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]);
#endif
f = fopen(_PATH_ETHERS, "re");
if (f == NULL)
return -1;
for (p = NULL;;) {
free(p);
p = fparseln(f, NULL, NULL, NULL, FPARSELN_UNESCALL);
if (p == NULL)
break;
#ifdef YP
/* A + in the file means try YP now. */
if (strcmp(p, "+") == 0) {
char *ypbuf, *ypdom;
int ypbuflen;
if (yp_get_default_domain(&ypdom))
continue;
if (yp_match(ypdom, "ethers.byaddr", trybuf,
trylen, &ypbuf, &ypbuflen))
continue;
ypbuflen = ether_line(ypbuf, &try, hostname);
free(ypbuf);
if (ypbuflen == 0)
goto done;
continue;
}
#endif
if (ether_line(p, &try, hostname) == 0 &&
memcmp(&try, e, sizeof try) == 0)
goto done;
}
free(p);
(void)fclose(f);
errno = ENOENT;
return -1;
done:
free(p);
(void)fclose(f);
return 0;
}
int
ether_hostton(const char *hostname, struct ether_addr *e)
{
FILE *f;
char *p;
char try[MAXHOSTNAMELEN + 1];
#ifdef YP
int hostlen = (int)strlen(hostname);
#endif
_DIAGASSERT(hostname != NULL);
_DIAGASSERT(e != NULL);
f = fopen(_PATH_ETHERS, "re");
if (f == NULL)
return -1;
for (p = NULL;;) {
free(p);
p = fparseln(f, NULL, NULL, NULL, FPARSELN_UNESCALL);
if (p == NULL)
break;
#ifdef YP
/* A + in the file means try YP now. */
if (strcmp(p, "+") == 0) {
char *ypbuf, *ypdom;
int ypbuflen;
if (yp_get_default_domain(&ypdom))
continue;
if (yp_match(ypdom, "ethers.byname", hostname, hostlen,
&ypbuf, &ypbuflen))
continue;
ypbuflen = ether_line(ypbuf, e, try);
free(ypbuf);
if (ypbuflen == 0)
goto done;
continue;
}
#endif
if (ether_line(p, e, try) == 0 && strcmp(hostname, try) == 0)
goto done;
}
free(p);
(void)fclose(f);
errno = ENOENT;
return -1;
done:
free(p);
(void)fclose(f);
return 0;
}
int
ether_line(const char *l, struct ether_addr *e, char *hostname)
{
u_int i[6];
#define S2(arg) #arg
#define S1(arg) S2(arg)
static const char fmt[] = " %x:%x:%x:%x:%x:%x"
" %" S1(MAXHOSTNAMELEN) "s\n";
#undef S2
#undef S1
_DIAGASSERT(l != NULL);
_DIAGASSERT(e != NULL);
_DIAGASSERT(hostname != NULL);
if (sscanf(l, fmt,
&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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