xref: /illumos-gate/usr/src/lib/gss_mechs/mech_krb5/krb5/os/dnssrv.c (revision 159d09a2)

/*
 * lib/krb5/os/dnssrv.c
 *
 * Copyright 1990,2000,2001,2002,2003 by the Massachusetts Institute of Technology.
 * All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 *
 *
 * do DNS SRV RR queries
 */

#include "autoconf.h"
#ifdef KRB5_DNS_LOOKUP

#include "dnsglue.h"

/*
 * Lookup a KDC via DNS SRV records
 */

void krb5int_free_srv_dns_data (struct srv_dns_entry *p)
{
    struct srv_dns_entry *next;
    while (p) {
	next = p->next;
	free(p->host);
	free(p);
	p = next;
    }
}

/* Do DNS SRV query, return results in *answers.

   Make best effort to return all the data we can.  On memory or
   decoding errors, just return what we've got.  Always return 0,
   currently.  */

krb5_error_code
krb5int_make_srv_query_realm(const krb5_data *realm,
			     const char *service,
			     const char *protocol,
			     struct srv_dns_entry **answers)
{
    const unsigned char *p = NULL, *base = NULL;
    char host[MAXDNAME], *h;
    int size, ret, rdlen, nlen;