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/*
* edns-subnet/subnet-whitelist.c - Hosts we actively try to send subnet option
* to.
*
* Copyright (c) 2013, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* Keep track of the white listed servers for subnet option. Based
* on acl_list.c|h
*/
#include "config.h"
#ifdef CLIENT_SUBNET /* keeps splint happy */
#include "edns-subnet/edns-subnet.h"
#include "edns-subnet/subnet-whitelist.h"
#include "util/regional.h"
#include "util/log.h"
#include "util/config_file.h"
#include "util/net_help.h"
#include "util/storage/dnstree.h"
#include "sldns/str2wire.h"
#include "util/data/dname.h"
struct ecs_whitelist*
ecs_whitelist_create(void)
{
struct ecs_whitelist* whitelist =
(struct ecs_whitelist*)calloc(1,
sizeof(struct ecs_whitelist));
if(!whitelist)
return NULL;
whitelist->region = regional_create();
if(!whitelist->region) {
ecs_whitelist_delete(whitelist);
return NULL;
}
return whitelist;
}
void
ecs_whitelist_delete(struct ecs_whitelist* whitelist)
{
if(!whitelist)
return;
regional_destroy(whitelist->region);
free(whitelist);
}
/** insert new address into whitelist structure */
static int
upstream_insert(struct ecs_whitelist* whitelist,
struct sockaddr_storage* addr, socklen_t addrlen, int net)
{
struct addr_tree_node* node = (struct addr_tree_node*)regional_alloc(
whitelist->region, sizeof(*node));
if(!node)
return 0;
if(!addr_tree_insert(&whitelist->upstream, node, addr, addrlen, net)) {
verbose(VERB_QUERY,
"duplicate send-client-subnet address ignored.");
}
return 1;
}
/** apply edns-subnet string */
static int
upstream_str_cfg(struct ecs_whitelist* whitelist, const char* str)
{
struct sockaddr_storage addr;
int net;
socklen_t addrlen;
verbose(VERB_ALGO, "send-client-subnet: %s", str);
if(!netblockstrtoaddr(str, UNBOUND_DNS_PORT, &addr, &addrlen, &net)) {
log_err("cannot parse send-client-subnet netblock: %s", str);
return 0;
}
if(!upstream_insert(whitelist, &addr, addrlen, net)) {
log_err("out of memory");
return 0;
}
return 1;
}
/** read client_subnet config */
static int
read_upstream(struct ecs_whitelist* whitelist, struct config_file* cfg)
{
struct config_strlist* p;
for(p = cfg->client_subnet; p; p = p->next) {
log_assert(p->str);
if(!upstream_str_cfg(whitelist, p->str))
return 0;
}
return 1;
}
/** read client_subnet_zone config */
static int
read_names(struct ecs_whitelist* whitelist, struct config_file* cfg)
{
/* parse names, report errors, insert into tree */
struct config_strlist* p;
struct name_tree_node* n;
uint8_t* nm, *nmr;
size_t nm_len;
int nm_labs;
for(p = cfg->client_subnet_zone; p; p = p->next) {
log_assert(p->str);
nm = sldns_str2wire_dname(p->str, &nm_len);
if(!nm) {
log_err("cannot parse client-subnet-zone: %s", p->str);
return 0;
}
nm_labs = dname_count_size_labels(nm, &nm_len);
nmr = (uint8_t*)regional_alloc_init(whitelist->region, nm,
nm_len);
free(nm);
if(!nmr) {
log_err("out of memory");
return 0;
}
n = (struct name_tree_node*)regional_alloc(whitelist->region,
sizeof(*n));
if(!n) {
log_err("out of memory");
return 0;
}
if(!name_tree_insert(&whitelist->dname, n, nmr, nm_len, nm_labs,
LDNS_RR_CLASS_IN)) {
verbose(VERB_QUERY, "ignoring duplicate "
"client-subnet-zone: %s", p->str);
}
}
return 1;
}
int
ecs_whitelist_apply_cfg(struct ecs_whitelist* whitelist,
struct config_file* cfg)
{
regional_free_all(whitelist->region);
addr_tree_init(&whitelist->upstream);
name_tree_init(&whitelist->dname);
if(!read_upstream(whitelist, cfg))
return 0;
if(!read_names(whitelist, cfg))
return 0;
addr_tree_init_parents(&whitelist->upstream);
name_tree_init_parents(&whitelist->dname);
return 1;
}
int
ecs_is_whitelisted(struct ecs_whitelist* whitelist,
struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* qname,
size_t qname_len, uint16_t qclass)
{
int labs;
if(addr_tree_lookup(&whitelist->upstream, addr, addrlen))
return 1;
/* Not in upstream whitelist, check dname whitelist. */
labs = dname_count_labels(qname);
return name_tree_lookup(&whitelist->dname, qname, qname_len, labs,
qclass) != NULL;
}
size_t
ecs_whitelist_get_mem(struct ecs_whitelist* whitelist)
{
if(!whitelist) return 0;
return sizeof(*whitelist) + regional_get_mem(whitelist->region);
}
#endif /* CLIENT_SUBNET */
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