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      1 /*	$NetBSD: getipnodebyaddr.c,v 1.2 2017/01/28 21:31:50 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1999 Kungliga Tekniska Hgskolan
      5  * (Royal Institute of Technology, Stockholm, Sweden).
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * 3. Neither the name of the Institute nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <config.h>
     37 
     38 #include <krb5/roken.h>
     39 
     40 /*
     41  * lookup `src, len' (address family `af') in DNS and return a pointer
     42  * to a malloced struct hostent or NULL.
     43  */
     44 
     45 ROKEN_LIB_FUNCTION struct hostent * ROKEN_LIB_CALL
     46 getipnodebyaddr (const void *src, size_t len, int af, int *error_num)
     47 {
     48     struct hostent *tmp;
     49 
     50     tmp = gethostbyaddr (src, len, af);
     51     if (tmp == NULL) {
     52 	switch (h_errno) {
     53 	case HOST_NOT_FOUND :
     54 	case TRY_AGAIN :
     55 	case NO_RECOVERY :
     56 	    *error_num = h_errno;
     57 	    break;
     58 	case NO_DATA :
     59 	    *error_num = NO_ADDRESS;
     60 	    break;
     61 	default :
     62 	    *error_num = NO_RECOVERY;
     63 	    break;
     64 	}
     65 	return NULL;
     66     }
     67     tmp = copyhostent (tmp);
     68     if (tmp == NULL) {
     69 	*error_num = TRY_AGAIN;
     70 	return NULL;
     71     }
     72     return tmp;
     73 }
     74