283 lines
9.4 KiB
C
283 lines
9.4 KiB
C
/*
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* util/storage/dnstree.c - support for rbtree types suitable for DNS code.
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*
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* Copyright (c) 2008, 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 structures combining types and functions to
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* manipulate those structures that help building DNS lookup trees.
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*/
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#include "config.h"
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#include "util/storage/dnstree.h"
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#include "util/data/dname.h"
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#include "util/net_help.h"
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int name_tree_compare(const void* k1, const void* k2)
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{
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struct name_tree_node* x = (struct name_tree_node*)k1;
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struct name_tree_node* y = (struct name_tree_node*)k2;
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int m;
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if(x->dclass != y->dclass) {
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if(x->dclass < y->dclass)
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return -1;
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return 1;
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}
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return dname_lab_cmp(x->name, x->labs, y->name, y->labs, &m);
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}
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int addr_tree_compare(const void* k1, const void* k2)
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{
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struct addr_tree_node* n1 = (struct addr_tree_node*)k1;
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struct addr_tree_node* n2 = (struct addr_tree_node*)k2;
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int r = sockaddr_cmp_addr(&n1->addr, n1->addrlen, &n2->addr,
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n2->addrlen);
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if(r != 0) return r;
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if(n1->net < n2->net)
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return -1;
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if(n1->net > n2->net)
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return 1;
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return 0;
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}
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void name_tree_init(rbtree_t* tree)
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{
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rbtree_init(tree, &name_tree_compare);
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}
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void addr_tree_init(rbtree_t* tree)
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{
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rbtree_init(tree, &addr_tree_compare);
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}
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int name_tree_insert(rbtree_t* tree, struct name_tree_node* node,
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uint8_t* name, size_t len, int labs, uint16_t dclass)
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{
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node->node.key = node;
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node->name = name;
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node->len = len;
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node->labs = labs;
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node->dclass = dclass;
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node->parent = NULL;
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return rbtree_insert(tree, &node->node) != NULL;
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}
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int addr_tree_insert(rbtree_t* tree, struct addr_tree_node* node,
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struct sockaddr_storage* addr, socklen_t addrlen, int net)
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{
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node->node.key = node;
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memcpy(&node->addr, addr, addrlen);
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node->addrlen = addrlen;
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node->net = net;
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node->parent = NULL;
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return rbtree_insert(tree, &node->node) != NULL;
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}
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void addr_tree_init_parents(rbtree_t* tree)
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{
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struct addr_tree_node* node, *prev = NULL, *p;
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int m;
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RBTREE_FOR(node, struct addr_tree_node*, tree) {
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node->parent = NULL;
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if(!prev || prev->addrlen != node->addrlen) {
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prev = node;
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continue;
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}
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m = addr_in_common(&prev->addr, prev->net, &node->addr,
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node->net, node->addrlen);
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/* sort order like: ::/0, 1::/2, 1::/4, ... 2::/2 */
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/* find the previous, or parent-parent-parent */
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for(p = prev; p; p = p->parent)
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if(p->net <= m) {
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/* ==: since prev matched m, this is closest*/
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/* <: prev matches more, but is not a parent,
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* this one is a (grand)parent */
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node->parent = p;
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break;
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}
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prev = node;
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}
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}
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void name_tree_init_parents(rbtree_t* tree)
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{
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struct name_tree_node* node, *prev = NULL, *p;
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int m;
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RBTREE_FOR(node, struct name_tree_node*, tree) {
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node->parent = NULL;
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if(!prev || prev->dclass != node->dclass) {
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prev = node;
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continue;
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}
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(void)dname_lab_cmp(prev->name, prev->labs, node->name,
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node->labs, &m); /* we know prev is smaller */
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/* sort order like: . com. bla.com. zwb.com. net. */
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/* find the previous, or parent-parent-parent */
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for(p = prev; p; p = p->parent)
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if(p->labs <= m) {
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/* ==: since prev matched m, this is closest*/
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/* <: prev matches more, but is not a parent,
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* this one is a (grand)parent */
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node->parent = p;
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break;
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}
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prev = node;
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}
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}
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struct name_tree_node* name_tree_find(rbtree_t* tree, uint8_t* name,
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size_t len, int labs, uint16_t dclass)
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{
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struct name_tree_node key;
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key.node.key = &key;
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key.name = name;
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key.len = len;
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key.labs = labs;
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key.dclass = dclass;
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return (struct name_tree_node*)rbtree_search(tree, &key);
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}
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struct name_tree_node* name_tree_lookup(rbtree_t* tree, uint8_t* name,
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size_t len, int labs, uint16_t dclass)
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{
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rbnode_t* res = NULL;
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struct name_tree_node *result;
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struct name_tree_node key;
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key.node.key = &key;
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key.name = name;
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key.len = len;
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key.labs = labs;
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key.dclass = dclass;
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if(rbtree_find_less_equal(tree, &key, &res)) {
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/* exact */
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result = (struct name_tree_node*)res;
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} else {
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/* smaller element (or no element) */
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int m;
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result = (struct name_tree_node*)res;
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if(!result || result->dclass != dclass)
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return NULL;
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/* count number of labels matched */
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(void)dname_lab_cmp(result->name, result->labs, key.name,
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key.labs, &m);
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while(result) { /* go up until qname is subdomain of stub */
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if(result->labs <= m)
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break;
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result = result->parent;
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}
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}
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return result;
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}
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struct addr_tree_node* addr_tree_lookup(rbtree_t* tree,
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struct sockaddr_storage* addr, socklen_t addrlen)
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{
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rbnode_t* res = NULL;
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struct addr_tree_node* result;
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struct addr_tree_node key;
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key.node.key = &key;
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memcpy(&key.addr, addr, addrlen);
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key.addrlen = addrlen;
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key.net = (addr_is_ip6(addr, addrlen)?128:32);
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if(rbtree_find_less_equal(tree, &key, &res)) {
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/* exact */
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return (struct addr_tree_node*)res;
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} else {
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/* smaller element (or no element) */
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int m;
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result = (struct addr_tree_node*)res;
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if(!result || result->addrlen != addrlen)
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return 0;
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/* count number of bits matched */
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m = addr_in_common(&result->addr, result->net, addr,
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key.net, addrlen);
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while(result) { /* go up until addr is inside netblock */
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if(result->net <= m)
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break;
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result = result->parent;
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}
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}
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return result;
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}
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int
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name_tree_next_root(rbtree_t* tree, uint16_t* dclass)
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{
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struct name_tree_node key;
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rbnode_t* n;
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struct name_tree_node* p;
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if(*dclass == 0) {
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/* first root item is first item in tree */
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n = rbtree_first(tree);
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if(n == RBTREE_NULL)
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return 0;
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p = (struct name_tree_node*)n;
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if(dname_is_root(p->name)) {
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*dclass = p->dclass;
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return 1;
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}
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/* root not first item? search for higher items */
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*dclass = p->dclass + 1;
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return name_tree_next_root(tree, dclass);
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}
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/* find class n in tree, we may get a direct hit, or if we don't
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* this is the last item of the previous class so rbtree_next() takes
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* us to the next root (if any) */
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key.node.key = &key;
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key.name = (uint8_t*)"\000";
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key.len = 1;
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key.labs = 0;
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key.dclass = *dclass;
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n = NULL;
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if(rbtree_find_less_equal(tree, &key, &n)) {
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/* exact */
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return 1;
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} else {
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/* smaller element */
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if(!n || n == RBTREE_NULL)
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return 0; /* nothing found */
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n = rbtree_next(n);
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if(n == RBTREE_NULL)
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return 0; /* no higher */
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p = (struct name_tree_node*)n;
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if(dname_is_root(p->name)) {
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*dclass = p->dclass;
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return 1;
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}
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/* not a root node, return next higher item */
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*dclass = p->dclass+1;
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return name_tree_next_root(tree, dclass);
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}
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}
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