112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/*
|
|
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
|
|
*
|
|
* SPDX-License-Identifier: MPL-2.0
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
|
|
*
|
|
* See the COPYRIGHT file distributed with this work for additional
|
|
* information regarding copyright ownership.
|
|
*/
|
|
|
|
/*! \file */
|
|
|
|
#include <string.h>
|
|
|
|
#include <isc/buffer.h>
|
|
#include <isc/mem.h>
|
|
#include <isc/netaddr.h>
|
|
#include <isc/util.h>
|
|
|
|
#include <dns/ecs.h>
|
|
#include <dns/nsec.h>
|
|
#include <dns/rbt.h>
|
|
#include <dns/rdata.h>
|
|
#include <dns/rdatatype.h>
|
|
#include <dns/result.h>
|
|
#include <dns/types.h>
|
|
|
|
void
|
|
dns_ecs_init(dns_ecs_t *ecs) {
|
|
isc_netaddr_unspec(&ecs->addr);
|
|
ecs->source = 0;
|
|
ecs->scope = 0xff;
|
|
}
|
|
|
|
bool
|
|
dns_ecs_equals(const dns_ecs_t *ecs1, const dns_ecs_t *ecs2) {
|
|
const unsigned char *addr1, *addr2;
|
|
uint8_t mask;
|
|
size_t alen;
|
|
|
|
REQUIRE(ecs1 != NULL && ecs2 != NULL);
|
|
|
|
if (ecs1->source != ecs2->source ||
|
|
ecs1->addr.family != ecs2->addr.family)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
alen = (ecs1->source + 7) / 8;
|
|
if (alen == 0) {
|
|
return true;
|
|
}
|
|
|
|
switch (ecs1->addr.family) {
|
|
case AF_INET:
|
|
INSIST(alen <= 4);
|
|
addr1 = (const unsigned char *)&ecs1->addr.type.in;
|
|
addr2 = (const unsigned char *)&ecs2->addr.type.in;
|
|
break;
|
|
case AF_INET6:
|
|
INSIST(alen <= 16);
|
|
addr1 = (const unsigned char *)&ecs1->addr.type.in6;
|
|
addr2 = (const unsigned char *)&ecs2->addr.type.in6;
|
|
break;
|
|
default:
|
|
UNREACHABLE();
|
|
}
|
|
|
|
/*
|
|
* Compare all octets except the final octet of the address
|
|
* prefix.
|
|
*/
|
|
if (alen > 1 && memcmp(addr1, addr2, alen - 1) != 0) {
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* It should not be necessary to mask the final octet; all
|
|
* bits past the source prefix length are supposed to be 0.
|
|
* However, it seems prudent not to omit them from the
|
|
* comparison anyway.
|
|
*/
|
|
mask = (~0U << (8 - (ecs1->source % 8))) & 0xff;
|
|
if (mask == 0) {
|
|
mask = 0xff;
|
|
}
|
|
|
|
if ((addr1[alen - 1] & mask) != (addr2[alen - 1] & mask)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void
|
|
dns_ecs_format(const dns_ecs_t *ecs, char *buf, size_t size) {
|
|
size_t len;
|
|
char *p;
|
|
|
|
REQUIRE(ecs != NULL);
|
|
REQUIRE(buf != NULL);
|
|
REQUIRE(size >= DNS_ECS_FORMATSIZE);
|
|
|
|
isc_netaddr_format(&ecs->addr, buf, size);
|
|
len = strlen(buf);
|
|
p = buf + len;
|
|
snprintf(p, size - len, "/%d/%d", ecs->source,
|
|
ecs->scope == 0xff ? 0 : ecs->scope);
|
|
}
|