1/*	$NetBSD$	*/
2
3/*++
4/* NAME
5/*	dns_rr_to_pa 3
6/* SUMMARY
7/*	resource record to printable address
8/* SYNOPSIS
9/*	#include <dns.h>
10/*
11/*	const char *dns_rr_to_pa(rr, hostaddr)
12/*	DNS_RR	*rr;
13/*	MAI_HOSTADDR_STR *hostaddr;
14/* DESCRIPTION
15/*	dns_rr_to_pa() converts the address in a DNS resource record
16/*	into printable form and returns a pointer to the result.
17/*
18/*	Arguments:
19/* .IP rr
20/*	The DNS resource record.
21/* .IP hostaddr
22/*	Storage for the printable address.
23/* DIAGNOSTICS
24/*	The result is null in case of problems, with errno set
25/*	to indicate the nature of the problem.
26/* LICENSE
27/* .ad
28/* .fi
29/*	The Secure Mailer license must be distributed with this software.
30/* AUTHOR(S)
31/*	Wietse Venema
32/*	IBM T.J. Watson Research
33/*	P.O. Box 704
34/*	Yorktown Heights, NY 10598, USA
35/*--*/
36
37/* System libraries. */
38
39#include <sys_defs.h>
40#include <sys/socket.h>
41#include <netinet/in.h>
42#include <arpa/inet.h>
43#include <errno.h>
44
45/* Utility library. */
46
47#include <msg.h>
48
49/* DNS library. */
50
51#include <dns.h>
52
53/* dns_rr_to_pa - resource record to printable address */
54
55const char *dns_rr_to_pa(DNS_RR *rr, MAI_HOSTADDR_STR *hostaddr)
56{
57    if (rr->type == T_A) {
58	return (inet_ntop(AF_INET, rr->data, hostaddr->buf,
59			  sizeof(hostaddr->buf)));
60#ifdef HAS_IPV6
61    } else if (rr->type == T_AAAA) {
62	return (inet_ntop(AF_INET6, rr->data, hostaddr->buf,
63			  sizeof(hostaddr->buf)));
64#endif
65    } else {
66	errno = EAFNOSUPPORT;
67	return (0);
68    }
69}
70
71 /*
72  * Stand-alone test program.
73  */
74#ifdef TEST
75#include <vstream.h>
76#include <myaddrinfo.h>
77
78static const char *myname;
79
80static NORETURN usage(void)
81{
82    msg_fatal("usage: %s dnsaddrtype hostname", myname);
83}
84
85int     main(int argc, char **argv)
86{
87    DNS_RR *rr;
88    MAI_HOSTADDR_STR hostaddr;
89    VSTRING *why;
90    int     type;
91
92    myname = argv[0];
93    if (argc < 3)
94	usage();
95    why = vstring_alloc(1);
96
97    while (*++argv) {
98	if (argv[1] == 0)
99	    usage();
100	if ((type = dns_type(argv[0])) == 0)
101	    usage();
102	if (dns_lookup(argv[1], type, 0, &rr, (VSTRING *) 0, why) != DNS_OK)
103	    msg_fatal("%s: %s", argv[1], vstring_str(why));
104	if (dns_rr_to_pa(rr, &hostaddr) == 0)
105	    msg_fatal("dns_rr_to_sa: %m");
106	vstream_printf("%s -> %s\n", argv[1], hostaddr.buf);
107	vstream_fflush(VSTREAM_OUT);
108	argv += 1;
109	dns_rr_free(rr);
110    }
111    vstring_free(why);
112    return (0);
113}
114
115#endif
116