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/*
* iterator/iter_donotq.c - iterative resolver donotqueryaddresses storage.
*
* Copyright (c) 2007, 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
*
* This file contains functions to assist the iterator module.
* The donotqueryaddresses are stored and looked up. These addresses
* (like 127.0.0.1) must not be used to send queries to, and can be
* discarded immediately from the server selection.
*/
#include "config.h"
#include "iterator/iter_donotq.h"
#include "util/regional.h"
#include "util/log.h"
#include "util/config_file.h"
#include "util/net_help.h"
struct iter_donotq*
donotq_create(void)
{
struct iter_donotq* dq = (struct iter_donotq*)calloc(1,
sizeof(struct iter_donotq));
if(!dq)
return NULL;
dq->region = regional_create();
if(!dq->region) {
donotq_delete(dq);
return NULL;
}
return dq;
}
void
donotq_delete(struct iter_donotq* dq)
{
if(!dq)
return;
regional_destroy(dq->region);
free(dq);
}
/** insert new address into donotq structure */
static int
donotq_insert(struct iter_donotq* dq, struct sockaddr_storage* addr,
socklen_t addrlen, int net)
{
struct addr_tree_node* node = (struct addr_tree_node*)regional_alloc(
dq->region, sizeof(*node));
if(!node)
return 0;
if(!addr_tree_insert(&dq->tree, node, addr, addrlen, net)) {
verbose(VERB_QUERY, "duplicate donotquery address ignored.");
}
return 1;
}
/** apply donotq string */
static int
donotq_str_cfg(struct iter_donotq* dq, const char* str)
{
struct sockaddr_storage addr;
int net;
socklen_t addrlen;
verbose(VERB_ALGO, "donotq: %s", str);
if(!netblockstrtoaddr(str, UNBOUND_DNS_PORT, &addr, &addrlen, &net)) {
log_err("cannot parse donotquery netblock: %s", str);
return 0;
}
if(!donotq_insert(dq, &addr, addrlen, net)) {
log_err("out of memory");
return 0;
}
return 1;
}
/** read donotq config */
static int
read_donotq(struct iter_donotq* dq, struct config_file* cfg)
{
struct config_strlist* p;
for(p = cfg->donotqueryaddrs; p; p = p->next) {
log_assert(p->str);
if(!donotq_str_cfg(dq, p->str))
return 0;
}
return 1;
}
int
donotq_apply_cfg(struct iter_donotq* dq, struct config_file* cfg)
{
regional_free_all(dq->region);
addr_tree_init(&dq->tree);
if(!read_donotq(dq, cfg))
return 0;
if(cfg->donotquery_localhost) {
if(!donotq_str_cfg(dq, "127.0.0.0/8"))
return 0;
if(cfg->do_ip6) {
if(!donotq_str_cfg(dq, "::1"))
return 0;
}
}
addr_tree_init_parents(&dq->tree);
return 1;
}
int
donotq_lookup(struct iter_donotq* donotq, struct sockaddr_storage* addr,
socklen_t addrlen)
{
return addr_tree_lookup(&donotq->tree, addr, addrlen) != NULL;
}
size_t
donotq_get_mem(struct iter_donotq* donotq)
{
if(!donotq) return 0;
return sizeof(*donotq) + regional_get_mem(donotq->region);
}
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