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/* $OpenBSD: res_mkquery.c,v 1.14 2021/11/22 20:18:27 jca 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 <sys/socket.h>
#include <netinet/in.h>
#include <arpa/nameser.h> /* for MAXDNAME */
#include <netdb.h>
#include <asr.h>
#include <errno.h>
#include <resolv.h>
#include <string.h>
#include "asr_private.h"
/* This function is apparently needed by some ports. */
int
res_mkquery(int op, const char *dname, int class, int type,
const unsigned char *data, int datalen, const unsigned char *newrr,
unsigned char *buf, int buflen)
{
struct asr_ctx *ac;
struct asr_pack p;
struct asr_dns_header h;
char fqdn[MAXDNAME];
char dn[MAXDNAME];
/* we currently only support QUERY */
if (op != QUERY || data)
return (-1);
if (dname[0] == '\0' || dname[strlen(dname) - 1] != '.') {
if (strlcpy(fqdn, dname, sizeof(fqdn)) >= sizeof(fqdn) ||
strlcat(fqdn, ".", sizeof(fqdn)) >= sizeof(fqdn))
return (-1);
dname = fqdn;
}
if (_asr_dname_from_fqdn(dname, dn, sizeof(dn)) == -1)
return (-1);
ac = _asr_use_resolver(NULL);
memset(&h, 0, sizeof h);
h.id = res_randomid();
if (ac->ac_options & RES_RECURSE)
h.flags |= RD_MASK;
if (ac->ac_options & RES_USE_CD)
h.flags |= CD_MASK;
if (ac->ac_options & RES_TRUSTAD)
h.flags |= AD_MASK;
h.qdcount = 1;
if (ac->ac_options & (RES_USE_EDNS0 | RES_USE_DNSSEC))
h.arcount = 1;
_asr_pack_init(&p, buf, buflen);
_asr_pack_header(&p, &h);
_asr_pack_query(&p, type, class, dn);
if (ac->ac_options & (RES_USE_EDNS0 | RES_USE_DNSSEC))
_asr_pack_edns0(&p, MAXPACKETSZ,
ac->ac_options & RES_USE_DNSSEC);
_asr_ctx_unref(ac);
if (p.err)
return (-1);
return (p.offset);
}
/*
* This function is not documented, but used by sendmail.
* Put here because it uses asr_private.h too.
*/
int
res_querydomain(const char *name,
const char *domain,
int class,
int type,
u_char *answer,
int anslen)
{
char fqdn[MAXDNAME], ndom[MAXDNAME];
size_t n;
/* we really want domain to end with a dot for now */
if (domain && ((n = strlen(domain)) == 0 || domain[n - 1 ] != '.')) {
if (strlcpy(ndom, domain, sizeof(ndom)) >= sizeof(ndom) ||
strlcat(ndom, ".", sizeof(ndom)) >= sizeof(ndom)) {
h_errno = NETDB_INTERNAL;
errno = EINVAL;
return (-1);
}
domain = ndom;
}
if (_asr_make_fqdn(name, domain, fqdn, sizeof fqdn) == 0) {
h_errno = NETDB_INTERNAL;
errno = EINVAL;
return (-1);
}
return (res_query(fqdn, class, type, answer, anslen));
}
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