mirror of
https://gitlab.isc.org/isc-projects/bind9
synced 2025-08-22 01:59:26 +00:00
afb424c9b6
previously, dns_name_fromtext() took both a target name and an optional target buffer parameter, which could override the name's dedicated buffer. this interface is unnecessarily complex. we now have two functions, dns_name_fromtext() to convert text into a dns_name that has a dedicated buffer, and dns_name_wirefromtext() to convert text into uncompressed DNS wire format and append it to a target buffer. in cases where it really is necessary to have both, we can use dns_name_fromtext() to load the dns_name, then dns_name_towire() to append the wire format to the target buffer.
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <stdbool.h>
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#include <isc/mem.h>
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#include <isc/netaddr.h>
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#include <isc/result.h>
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#include <isc/string.h>
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#include <isc/util.h>
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#include <dns/byaddr.h>
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#include <dns/db.h>
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#include <dns/rdata.h>
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#include <dns/rdataset.h>
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#include <dns/rdatastruct.h>
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#include <dns/resolver.h>
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#include <dns/view.h>
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/*
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* XXXRTH We could use a static event...
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*/
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static char hex_digits[] = { '0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
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isc_result_t
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dns_byaddr_createptrname(const isc_netaddr_t *address, dns_name_t *name) {
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char textname[128];
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const unsigned char *bytes;
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int i;
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char *cp;
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isc_buffer_t buffer;
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unsigned int len;
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REQUIRE(address != NULL);
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/*
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* We create the text representation and then convert to a
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* dns_name_t. This is not maximally efficient, but it keeps all
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* of the knowledge of wire format in the dns_name_ routines.
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*/
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bytes = (const unsigned char *)(&address->type);
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if (address->family == AF_INET) {
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(void)snprintf(textname, sizeof(textname),
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"%u.%u.%u.%u.in-addr.arpa.",
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((unsigned int)bytes[3] & 0xffU),
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((unsigned int)bytes[2] & 0xffU),
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((unsigned int)bytes[1] & 0xffU),
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((unsigned int)bytes[0] & 0xffU));
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} else if (address->family == AF_INET6) {
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size_t remaining;
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cp = textname;
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for (i = 15; i >= 0; i--) {
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*cp++ = hex_digits[bytes[i] & 0x0f];
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*cp++ = '.';
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*cp++ = hex_digits[(bytes[i] >> 4) & 0x0f];
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*cp++ = '.';
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}
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remaining = sizeof(textname) - (cp - textname);
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strlcpy(cp, "ip6.arpa.", remaining);
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} else {
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return ISC_R_NOTIMPLEMENTED;
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}
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len = (unsigned int)strlen(textname);
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isc_buffer_init(&buffer, textname, len);
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isc_buffer_add(&buffer, len);
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return dns_name_fromtext(name, &buffer, dns_rootname, 0);
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}
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