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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC 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.
*/
/* $Id: byaddr.c,v 1.12 2020/01/20 18:51:52 florian Exp $ */
/*! \file */
#include <config.h>
#include <isc/buffer.h>
#include <isc/netaddr.h>
#include <string.h> /* Required for HP/UX (and others?) */
#include <isc/task.h>
#include <isc/util.h>
#include <dns/byaddr.h>
#include <dns/events.h>
#include <dns/rdata.h>
#include <dns/rdataset.h>
#include <dns/rdatastruct.h>
#include <dns/result.h>
/*
* XXXRTH We could use a static event...
*/
static char hex_digits[] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
isc_result_t
dns_byaddr_createptrname2(isc_netaddr_t *address, unsigned int options,
dns_name_t *name)
{
char textname[128];
unsigned char *bytes;
int i;
char *cp;
isc_buffer_t buffer;
unsigned int len;
REQUIRE(address != NULL);
/*
* We create the text representation and then convert to a
* dns_name_t. This is not maximally efficient, but it keeps all
* of the knowledge of wire format in the dns_name_ routines.
*/
bytes = (unsigned char *)(&address->type);
if (address->family == AF_INET) {
(void)snprintf(textname, sizeof(textname),
"%u.%u.%u.%u.in-addr.arpa.",
(bytes[3] & 0xffU),
(bytes[2] & 0xffU),
(bytes[1] & 0xffU),
(bytes[0] & 0xffU));
} else if (address->family == AF_INET6) {
size_t remaining;
cp = textname;
for (i = 15; i >= 0; i--) {
*cp++ = hex_digits[bytes[i] & 0x0f];
*cp++ = '.';
*cp++ = hex_digits[(bytes[i] >> 4) & 0x0f];
*cp++ = '.';
}
remaining = sizeof(textname) - (cp - textname);
if ((options & DNS_BYADDROPT_IPV6INT) != 0) {
strlcpy(cp, "ip6.int.", remaining);
} else {
strlcpy(cp, "ip6.arpa.", remaining);
}
} else
return (ISC_R_NOTIMPLEMENTED);
len = (unsigned int)strlen(textname);
isc_buffer_init(&buffer, textname, len);
isc_buffer_add(&buffer, len);
return (dns_name_fromtext(name, &buffer, dns_rootname, 0, NULL));
}
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