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/* $OpenBSD: getnetnamadr.c,v 1.7 2014/03/25 19:48:11 eric Exp $ */
/*
* Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <netinet/in.h>
#include <errno.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include "asr.h"
static void _fillnetent(const struct netent *, struct netent *, char *buf,
size_t);
static struct netent _netent;
static char _entbuf[4096];
static char *_empty[] = { NULL, };
static void
_fillnetent(const struct netent *e, struct netent *r, char *buf, size_t len)
{
char **ptr, *end, *pos;
size_t n, i;
int naliases;
bzero(buf, len);
bzero(r, sizeof(*r));
r->n_aliases = _empty;
end = buf + len;
ptr = (char **)ALIGN(buf);
if ((char *)ptr >= end)
return;
for (naliases = 0; e->n_aliases[naliases]; naliases++)
;
r->n_name = NULL;
r->n_addrtype = e->n_addrtype;
r->n_net = e->n_net;
r->n_aliases = ptr;
pos = (char *)(ptr + (naliases + 1));
if (pos > end)
r->n_aliases = _empty;
n = strlcpy(pos, e->n_name, end - pos);
if (n >= end - pos)
return;
r->n_name = pos;
pos += n + 1;
for (i = 0; i < naliases; i++) {
n = strlcpy(pos, e->n_aliases[i], end - pos);
if (n >= end - pos)
return;
r->n_aliases[i] = pos;
pos += n + 1;
}
}
struct netent *
getnetbyname(const char *name)
{
struct asr_query *as;
struct asr_result ar;
res_init();
as = getnetbyname_async(name, NULL);
if (as == NULL) {
h_errno = NETDB_INTERNAL;
return (NULL);
}
asr_run_sync(as, &ar);
errno = ar.ar_errno;
h_errno = ar.ar_h_errno;
if (ar.ar_netent == NULL)
return (NULL);
_fillnetent(ar.ar_netent, &_netent, _entbuf, sizeof(_entbuf));
free(ar.ar_netent);
return (&_netent);
}
struct netent *
getnetbyaddr(in_addr_t net, int type)
{
struct asr_query *as;
struct asr_result ar;
res_init();
as = getnetbyaddr_async(net, type, NULL);
if (as == NULL) {
h_errno = NETDB_INTERNAL;
return (NULL);
}
asr_run_sync(as, &ar);
errno = ar.ar_errno;
h_errno = ar.ar_h_errno;
if (ar.ar_netent == NULL)
return (NULL);
_fillnetent(ar.ar_netent, &_netent, _entbuf, sizeof(_entbuf));
free(ar.ar_netent);
return (&_netent);
}
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