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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: netaddr.c,v 1.4 2020/02/13 16:55:44 florian Exp $ */
/*! \file */
#include <stdio.h>
#include <isc/buffer.h>
#include <isc/net.h>
#include <isc/netaddr.h>
#include <isc/sockaddr.h>
#include <string.h>
#include <isc/util.h>
isc_boolean_t
isc_netaddr_eqprefix(const isc_netaddr_t *a, const isc_netaddr_t *b,
unsigned int prefixlen)
{
const unsigned char *pa = NULL, *pb = NULL;
unsigned int ipabytes = 0; /* Length of whole IP address in bytes */
unsigned int nbytes; /* Number of significant whole bytes */
unsigned int nbits; /* Number of significant leftover bits */
REQUIRE(a != NULL && b != NULL);
if (a->family != b->family)
return (ISC_FALSE);
if (a->zone != b->zone && b->zone != 0)
return (ISC_FALSE);
switch (a->family) {
case AF_INET:
pa = (const unsigned char *) &a->type.in;
pb = (const unsigned char *) &b->type.in;
ipabytes = 4;
break;
case AF_INET6:
pa = (const unsigned char *) &a->type.in6;
pb = (const unsigned char *) &b->type.in6;
ipabytes = 16;
break;
default:
return (ISC_FALSE);
}
/*
* Don't crash if we get a pattern like 10.0.0.1/9999999.
*/
if (prefixlen > ipabytes * 8)
prefixlen = ipabytes * 8;
nbytes = prefixlen / 8;
nbits = prefixlen % 8;
if (nbytes > 0) {
if (memcmp(pa, pb, nbytes) != 0)
return (ISC_FALSE);
}
if (nbits > 0) {
unsigned int bytea, byteb, mask;
INSIST(nbytes < ipabytes);
INSIST(nbits < 8);
bytea = pa[nbytes];
byteb = pb[nbytes];
mask = (0xFF << (8-nbits)) & 0xFF;
if ((bytea & mask) != (byteb & mask))
return (ISC_FALSE);
}
return (ISC_TRUE);
}
isc_result_t
isc_netaddr_totext(const isc_netaddr_t *netaddr, isc_buffer_t *target) {
char abuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
char zbuf[sizeof("%4294967295")];
unsigned int alen;
int zlen;
const char *r;
const void *type;
REQUIRE(netaddr != NULL);
switch (netaddr->family) {
case AF_INET:
type = &netaddr->type.in;
break;
case AF_INET6:
type = &netaddr->type.in6;
break;
default:
return (ISC_R_FAILURE);
}
r = inet_ntop(netaddr->family, type, abuf, sizeof(abuf));
if (r == NULL)
return (ISC_R_FAILURE);
alen = strlen(abuf);
INSIST(alen < sizeof(abuf));
zlen = 0;
if (netaddr->family == AF_INET6 && netaddr->zone != 0) {
zlen = snprintf(zbuf, sizeof(zbuf), "%%%u", netaddr->zone);
if (zlen < 0)
return (ISC_R_FAILURE);
INSIST((unsigned int)zlen < sizeof(zbuf));
}
if (alen + zlen > isc_buffer_availablelength(target))
return (ISC_R_NOSPACE);
isc_buffer_putmem(target, (unsigned char *)abuf, alen);
isc_buffer_putmem(target, (unsigned char *)zbuf, zlen);
return (ISC_R_SUCCESS);
}
void
isc_netaddr_format(const isc_netaddr_t *na, char *array, unsigned int size) {
isc_result_t result;
isc_buffer_t buf;
isc_buffer_init(&buf, array, size);
result = isc_netaddr_totext(na, &buf);
if (size == 0)
return;
/*
* Null terminate.
*/
if (result == ISC_R_SUCCESS) {
if (isc_buffer_availablelength(&buf) >= 1)
isc_buffer_putuint8(&buf, 0);
else
result = ISC_R_NOSPACE;
}
if (result != ISC_R_SUCCESS) {
snprintf(array, size, "<unknown address, family %u>",
na->family);
array[size - 1] = '\0';
}
}
uint32_t
isc_netaddr_getzone(const isc_netaddr_t *netaddr) {
return (netaddr->zone);
}
void
isc_netaddr_fromsockaddr(isc_netaddr_t *t, const isc_sockaddr_t *s) {
int family = s->type.sa.sa_family;
t->family = family;
switch (family) {
case AF_INET:
t->type.in = s->type.sin.sin_addr;
t->zone = 0;
break;
case AF_INET6:
memmove(&t->type.in6, &s->type.sin6.sin6_addr, 16);
t->zone = s->type.sin6.sin6_scope_id;
break;
default:
INSIST(0);
}
}
isc_boolean_t
isc_netaddr_ismulticast(isc_netaddr_t *na) {
switch (na->family) {
case AF_INET:
return (ISC_TF(ISC_IPADDR_ISMULTICAST(na->type.in.s_addr)));
case AF_INET6:
return (ISC_TF(IN6_IS_ADDR_MULTICAST(&na->type.in6)));
default:
return (ISC_FALSE); /* XXXMLG ? */
}
}
isc_boolean_t
isc_netaddr_isexperimental(isc_netaddr_t *na) {
switch (na->family) {
case AF_INET:
return (ISC_TF(ISC_IPADDR_ISEXPERIMENTAL(na->type.in.s_addr)));
default:
return (ISC_FALSE); /* XXXMLG ? */
}
}
isc_boolean_t
isc_netaddr_islinklocal(isc_netaddr_t *na) {
switch (na->family) {
case AF_INET:
return (ISC_FALSE);
case AF_INET6:
return (ISC_TF(IN6_IS_ADDR_LINKLOCAL(&na->type.in6)));
default:
return (ISC_FALSE);
}
}
isc_boolean_t
isc_netaddr_issitelocal(isc_netaddr_t *na) {
switch (na->family) {
case AF_INET:
return (ISC_FALSE);
case AF_INET6:
return (ISC_TF(IN6_IS_ADDR_SITELOCAL(&na->type.in6)));
default:
return (ISC_FALSE);
}
}
#define ISC_IPADDR_ISNETZERO(i) \
(((uint32_t)(i) & ISC__IPADDR(0xff000000)) \
== ISC__IPADDR(0x00000000))
isc_boolean_t
isc_netaddr_isnetzero(isc_netaddr_t *na) {
switch (na->family) {
case AF_INET:
return (ISC_TF(ISC_IPADDR_ISNETZERO(na->type.in.s_addr)));
case AF_INET6:
return (ISC_FALSE);
default:
return (ISC_FALSE);
}
}
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