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/*++
/* NAME
/* dns_rr_to_pa 3
/* SUMMARY
/* resource record to printable address
/* SYNOPSIS
/* #include <dns.h>
/*
/* const char *dns_rr_to_pa(rr, hostaddr)
/* DNS_RR *rr;
/* MAI_HOSTADDR_STR *hostaddr;
/* DESCRIPTION
/* dns_rr_to_pa() converts the address in a DNS resource record
/* into printable form and returns a pointer to the result.
/*
/* Arguments:
/* .IP rr
/* The DNS resource record.
/* .IP hostaddr
/* Storage for the printable address.
/* DIAGNOSTICS
/* The result is null in case of problems, with errno set
/* to indicate the nature of the problem.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System libraries. */
#include <sys_defs.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
/* Utility library. */
#include <msg.h>
/* DNS library. */
#include <dns.h>
/* dns_rr_to_pa - resource record to printable address */
const char *dns_rr_to_pa(DNS_RR *rr, MAI_HOSTADDR_STR *hostaddr)
{
if (rr->type == T_A) {
return (inet_ntop(AF_INET, rr->data, hostaddr->buf,
sizeof(hostaddr->buf)));
#ifdef HAS_IPV6
} else if (rr->type == T_AAAA) {
return (inet_ntop(AF_INET6, rr->data, hostaddr->buf,
sizeof(hostaddr->buf)));
#endif
} else {
errno = EAFNOSUPPORT;
return (0);
}
}
/*
* Stand-alone test program.
*/
#ifdef TEST
#include <vstream.h>
#include <myaddrinfo.h>
static const char *myname;
static NORETURN usage(void)
{
msg_fatal("usage: %s dnsaddrtype hostname", myname);
}
int main(int argc, char **argv)
{
DNS_RR *rr;
MAI_HOSTADDR_STR hostaddr;
VSTRING *why;
int type;
myname = argv[0];
if (argc < 3)
usage();
why = vstring_alloc(1);
while (*++argv) {
if (argv[1] == 0)
usage();
if ((type = dns_type(argv[0])) == 0)
usage();
if (dns_lookup(argv[1], type, 0, &rr, (VSTRING *) 0, why) != DNS_OK)
msg_fatal("%s: %s", argv[1], vstring_str(why));
if (dns_rr_to_pa(rr, &hostaddr) == 0)
msg_fatal("dns_rr_to_sa: %m");
vstream_printf("%s -> %s\n", argv[1], hostaddr.buf);
vstream_fflush(VSTREAM_OUT);
argv += 1;
dns_rr_free(rr);
}
vstring_free(why);
return (0);
}
#endif
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