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a85b5759f3
These files were pulled from the 1.6.3 release tarball. This new version builds against OpenSSL version 1.1 which will be the default in the new Debian Stable which is due to be released RealSoonNow (tm).
295 lines
9.8 KiB
C
295 lines
9.8 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* 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_type* tree,
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struct sockaddr_storage* addr, socklen_t addrlen)
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{
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rbnode_type* 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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struct addr_tree_node* addr_tree_find(rbtree_type* tree,
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struct sockaddr_storage* addr, socklen_t addrlen, int net)
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{
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rbnode_type* res = NULL;
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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 = net;
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res = rbtree_search(tree, &key);
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return (struct addr_tree_node*)res;
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}
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int
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name_tree_next_root(rbtree_type* tree, uint16_t* dclass)
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{
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struct name_tree_node key;
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rbnode_type* 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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