154 lines
4.2 KiB
C
154 lines
4.2 KiB
C
/*
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* iterator/iter_donotq.c - iterative resolver donotqueryaddresses storage.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions to assist the iterator module.
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* The donotqueryaddresses are stored and looked up. These addresses
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* (like 127.0.0.1) must not be used to send queries to, and can be
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* discarded immediately from the server selection.
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*/
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#include "config.h"
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#include "iterator/iter_donotq.h"
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#include "util/regional.h"
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#include "util/log.h"
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#include "util/config_file.h"
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#include "util/net_help.h"
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struct iter_donotq*
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donotq_create(void)
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{
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struct iter_donotq* dq = (struct iter_donotq*)calloc(1,
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sizeof(struct iter_donotq));
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if(!dq)
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return NULL;
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dq->region = regional_create();
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if(!dq->region) {
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donotq_delete(dq);
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return NULL;
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}
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return dq;
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}
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void
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donotq_delete(struct iter_donotq* dq)
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{
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if(!dq)
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return;
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regional_destroy(dq->region);
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free(dq);
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}
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/** insert new address into donotq structure */
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static int
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donotq_insert(struct iter_donotq* dq, struct sockaddr_storage* addr,
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socklen_t addrlen, int net)
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{
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struct addr_tree_node* node = (struct addr_tree_node*)regional_alloc(
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dq->region, sizeof(*node));
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if(!node)
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return 0;
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if(!addr_tree_insert(&dq->tree, node, addr, addrlen, net)) {
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verbose(VERB_QUERY, "duplicate donotquery address ignored.");
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}
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return 1;
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}
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/** apply donotq string */
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static int
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donotq_str_cfg(struct iter_donotq* dq, const char* str)
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{
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struct sockaddr_storage addr;
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int net;
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socklen_t addrlen;
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verbose(VERB_ALGO, "donotq: %s", str);
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if(!netblockstrtoaddr(str, UNBOUND_DNS_PORT, &addr, &addrlen, &net)) {
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log_err("cannot parse donotquery netblock: %s", str);
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return 0;
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}
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if(!donotq_insert(dq, &addr, addrlen, net)) {
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log_err("out of memory");
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return 0;
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}
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return 1;
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}
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/** read donotq config */
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static int
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read_donotq(struct iter_donotq* dq, struct config_file* cfg)
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{
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struct config_strlist* p;
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for(p = cfg->donotqueryaddrs; p; p = p->next) {
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log_assert(p->str);
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if(!donotq_str_cfg(dq, p->str))
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return 0;
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}
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return 1;
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}
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int
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donotq_apply_cfg(struct iter_donotq* dq, struct config_file* cfg)
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{
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regional_free_all(dq->region);
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addr_tree_init(&dq->tree);
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if(!read_donotq(dq, cfg))
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return 0;
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if(cfg->donotquery_localhost) {
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if(!donotq_str_cfg(dq, "127.0.0.0/8"))
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return 0;
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if(cfg->do_ip6) {
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if(!donotq_str_cfg(dq, "::1"))
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return 0;
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}
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}
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addr_tree_init_parents(&dq->tree);
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return 1;
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}
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int
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donotq_lookup(struct iter_donotq* donotq, struct sockaddr_storage* addr,
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socklen_t addrlen)
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{
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return addr_tree_lookup(&donotq->tree, addr, addrlen) != NULL;
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}
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size_t
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donotq_get_mem(struct iter_donotq* donotq)
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{
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if(!donotq) return 0;
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return sizeof(*donotq) + regional_get_mem(donotq->region);
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}
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