/*
* Determine whether a given address or signer matches a given ACL.
* For a match with a positive ACL element or iptable radix entry,
* return with a positive value in match; for a match with a negated ACL
* element or radix entry, return with a negative value in match.
*/
isc_result_t
dns_acl_match(const isc_netaddr_t *reqaddr,
const dns_name_t *reqsigner,
const dns_acl_t *acl,
const dns_aclenv_t *env,
int *match,
const dns_aclelement_t **matchelt)
{
isc_uint16_t bitlen, family;
isc_prefix_t pfx;
isc_radix_node_t *node = NULL;
const isc_netaddr_t *addr;
isc_netaddr_t v4addr;
isc_result_t result;
int match_num = -1;
unsigned int i;
REQUIRE(reqaddr != NULL);
REQUIRE(matchelt == NULL || *matchelt == NULL);
if (env == NULL || env->match_mapped == ISC_FALSE ||
reqaddr->family != AF_INET6 ||
!IN6_IS_ADDR_V4MAPPED(&reqaddr->type.in6))
addr = reqaddr;
else {
isc_netaddr_fromv4mapped(&v4addr, reqaddr);
addr = &v4addr;
}
/* Always match with host addresses. */
family = addr->family;
bitlen = family == AF_INET6 ? 128 : 32;
NETADDR_TO_PREFIX_T(addr, pfx, bitlen);
/* Assume no match. */
*match = 0;
/* Search radix. */
result = isc_radix_search(acl->iptable->radix, &node, &pfx);
/* Found a match. */
if (result == ISC_R_SUCCESS && node != NULL) {
match_num = node->node_num[ISC_IS6(family)];
if (*(isc_boolean_t *) node->data[ISC_IS6(family)] == ISC_TRUE)
*match = match_num;
else
*match = -match_num;
}
/* Now search non-radix elements for a match with a lower node_num. */
for (i = 0; i < acl->length; i++) {
dns_aclelement_t *e = &acl->elements[i];
/* Already found a better match? */
if (match_num != -1 && match_num < e->node_num) {
isc_refcount_destroy(&pfx.refcount);
return (ISC_R_SUCCESS);
}
if (dns_aclelement_match(reqaddr, reqsigner,
e, env, matchelt)) {
if (match_num == -1 || e->node_num < match_num) {
if (e->negative == ISC_TRUE)
*match = -e->node_num;
else
*match = e->node_num;
}
isc_refcount_destroy(&pfx.refcount);
return (ISC_R_SUCCESS);
}
}
isc_refcount_destroy(&pfx.refcount);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_acl_match2(const isc_netaddr_t *reqaddr,
const dns_name_t *reqsigner,
const isc_netaddr_t *ecs,
isc_uint8_t ecslen,
isc_uint8_t *scope,
const dns_acl_t *acl,
const dns_aclenv_t *env,
int *match,
const dns_aclelement_t **matchelt)
{
isc_uint16_t bitlen;
isc_prefix_t pfx;
isc_radix_node_t *node = NULL;
const isc_netaddr_t *addr = reqaddr;
isc_netaddr_t v4addr;
isc_result_t result;
int match_num = -1;
unsigned int i;
REQUIRE(reqaddr != NULL);
REQUIRE(matchelt == NULL || *matchelt == NULL);
REQUIRE(ecs != NULL || scope == NULL);
if (env != NULL && env->match_mapped &&
addr->family == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&addr->type.in6))
{
isc_netaddr_fromv4mapped(&v4addr, addr);
addr = &v4addr;
}
/* Always match with host addresses. */
bitlen = (addr->family == AF_INET6) ? 128 : 32;
NETADDR_TO_PREFIX_T(addr, pfx, bitlen, ISC_FALSE);
/* Assume no match. */
*match = 0;
/* Search radix. */
result = isc_radix_search(acl->iptable->radix, &node, &pfx);
/* Found a match. */
if (result == ISC_R_SUCCESS && node != NULL) {
int off = ISC_RADIX_OFF(&pfx);
match_num = node->node_num[off];
if (*(isc_boolean_t *) node->data[off])
*match = match_num;
else
*match = -match_num;
}
isc_refcount_destroy(&pfx.refcount);
/*
* If ecs is not NULL, we search the radix tree again to
* see if we find a better match on an ECS node
*/
if (ecs != NULL) {
node = NULL;
addr = ecs;
if (env != NULL && env->match_mapped &&
addr->family == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&addr->type.in6))
{
isc_netaddr_fromv4mapped(&v4addr, addr);
addr = &v4addr;
}
NETADDR_TO_PREFIX_T(addr, pfx, ecslen, ISC_TRUE);
result = isc_radix_search(acl->iptable->radix, &node, &pfx);
if (result == ISC_R_SUCCESS && node != NULL) {
int off = ISC_RADIX_OFF(&pfx);
if (match_num == -1 ||
node->node_num[off] < match_num)
{
match_num = node->node_num[off];
if (scope != NULL)
*scope = node->bit;
if (*(isc_boolean_t *) node->data[off])
*match = match_num;
else
*match = -match_num;
}
}
isc_refcount_destroy(&pfx.refcount);
}
/* Now search non-radix elements for a match with a lower node_num. */
for (i = 0; i < acl->length; i++) {
dns_aclelement_t *e = &acl->elements[i];
/* Already found a better match? */
if (match_num != -1 && match_num < e->node_num) {
break;
}
if (dns_aclelement_match2(reqaddr, reqsigner, ecs, ecslen,
scope, e, env, matchelt))
{
if (match_num == -1 || e->node_num < match_num) {
if (e->negative)
*match = -e->node_num;
else
*match = e->node_num;
}
break;
}
}
return (ISC_R_SUCCESS);
}
