mirror of
https://github.com/monero-project/monero.git
synced 2024-10-01 11:49:47 -04:00
283 lines
9.4 KiB
C
283 lines
9.4 KiB
C
/*
|
|
* util/storage/dnstree.c - support for rbtree types suitable for DNS code.
|
|
*
|
|
* Copyright (c) 2008, 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 structures combining types and functions to
|
|
* manipulate those structures that help building DNS lookup trees.
|
|
*/
|
|
#include "config.h"
|
|
#include "util/storage/dnstree.h"
|
|
#include "util/data/dname.h"
|
|
#include "util/net_help.h"
|
|
|
|
int name_tree_compare(const void* k1, const void* k2)
|
|
{
|
|
struct name_tree_node* x = (struct name_tree_node*)k1;
|
|
struct name_tree_node* y = (struct name_tree_node*)k2;
|
|
int m;
|
|
if(x->dclass != y->dclass) {
|
|
if(x->dclass < y->dclass)
|
|
return -1;
|
|
return 1;
|
|
}
|
|
return dname_lab_cmp(x->name, x->labs, y->name, y->labs, &m);
|
|
}
|
|
|
|
int addr_tree_compare(const void* k1, const void* k2)
|
|
{
|
|
struct addr_tree_node* n1 = (struct addr_tree_node*)k1;
|
|
struct addr_tree_node* n2 = (struct addr_tree_node*)k2;
|
|
int r = sockaddr_cmp_addr(&n1->addr, n1->addrlen, &n2->addr,
|
|
n2->addrlen);
|
|
if(r != 0) return r;
|
|
if(n1->net < n2->net)
|
|
return -1;
|
|
if(n1->net > n2->net)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
void name_tree_init(rbtree_t* tree)
|
|
{
|
|
rbtree_init(tree, &name_tree_compare);
|
|
}
|
|
|
|
void addr_tree_init(rbtree_t* tree)
|
|
{
|
|
rbtree_init(tree, &addr_tree_compare);
|
|
}
|
|
|
|
int name_tree_insert(rbtree_t* tree, struct name_tree_node* node,
|
|
uint8_t* name, size_t len, int labs, uint16_t dclass)
|
|
{
|
|
node->node.key = node;
|
|
node->name = name;
|
|
node->len = len;
|
|
node->labs = labs;
|
|
node->dclass = dclass;
|
|
node->parent = NULL;
|
|
return rbtree_insert(tree, &node->node) != NULL;
|
|
}
|
|
|
|
int addr_tree_insert(rbtree_t* tree, struct addr_tree_node* node,
|
|
struct sockaddr_storage* addr, socklen_t addrlen, int net)
|
|
{
|
|
node->node.key = node;
|
|
memcpy(&node->addr, addr, addrlen);
|
|
node->addrlen = addrlen;
|
|
node->net = net;
|
|
node->parent = NULL;
|
|
return rbtree_insert(tree, &node->node) != NULL;
|
|
}
|
|
|
|
void addr_tree_init_parents(rbtree_t* tree)
|
|
{
|
|
struct addr_tree_node* node, *prev = NULL, *p;
|
|
int m;
|
|
RBTREE_FOR(node, struct addr_tree_node*, tree) {
|
|
node->parent = NULL;
|
|
if(!prev || prev->addrlen != node->addrlen) {
|
|
prev = node;
|
|
continue;
|
|
}
|
|
m = addr_in_common(&prev->addr, prev->net, &node->addr,
|
|
node->net, node->addrlen);
|
|
/* sort order like: ::/0, 1::/2, 1::/4, ... 2::/2 */
|
|
/* find the previous, or parent-parent-parent */
|
|
for(p = prev; p; p = p->parent)
|
|
if(p->net <= m) {
|
|
/* ==: since prev matched m, this is closest*/
|
|
/* <: prev matches more, but is not a parent,
|
|
* this one is a (grand)parent */
|
|
node->parent = p;
|
|
break;
|
|
}
|
|
prev = node;
|
|
}
|
|
}
|
|
|
|
void name_tree_init_parents(rbtree_t* tree)
|
|
{
|
|
struct name_tree_node* node, *prev = NULL, *p;
|
|
int m;
|
|
RBTREE_FOR(node, struct name_tree_node*, tree) {
|
|
node->parent = NULL;
|
|
if(!prev || prev->dclass != node->dclass) {
|
|
prev = node;
|
|
continue;
|
|
}
|
|
(void)dname_lab_cmp(prev->name, prev->labs, node->name,
|
|
node->labs, &m); /* we know prev is smaller */
|
|
/* sort order like: . com. bla.com. zwb.com. net. */
|
|
/* find the previous, or parent-parent-parent */
|
|
for(p = prev; p; p = p->parent)
|
|
if(p->labs <= m) {
|
|
/* ==: since prev matched m, this is closest*/
|
|
/* <: prev matches more, but is not a parent,
|
|
* this one is a (grand)parent */
|
|
node->parent = p;
|
|
break;
|
|
}
|
|
prev = node;
|
|
}
|
|
}
|
|
|
|
struct name_tree_node* name_tree_find(rbtree_t* tree, uint8_t* name,
|
|
size_t len, int labs, uint16_t dclass)
|
|
{
|
|
struct name_tree_node key;
|
|
key.node.key = &key;
|
|
key.name = name;
|
|
key.len = len;
|
|
key.labs = labs;
|
|
key.dclass = dclass;
|
|
return (struct name_tree_node*)rbtree_search(tree, &key);
|
|
}
|
|
|
|
struct name_tree_node* name_tree_lookup(rbtree_t* tree, uint8_t* name,
|
|
size_t len, int labs, uint16_t dclass)
|
|
{
|
|
rbnode_t* res = NULL;
|
|
struct name_tree_node *result;
|
|
struct name_tree_node key;
|
|
key.node.key = &key;
|
|
key.name = name;
|
|
key.len = len;
|
|
key.labs = labs;
|
|
key.dclass = dclass;
|
|
if(rbtree_find_less_equal(tree, &key, &res)) {
|
|
/* exact */
|
|
result = (struct name_tree_node*)res;
|
|
} else {
|
|
/* smaller element (or no element) */
|
|
int m;
|
|
result = (struct name_tree_node*)res;
|
|
if(!result || result->dclass != dclass)
|
|
return NULL;
|
|
/* count number of labels matched */
|
|
(void)dname_lab_cmp(result->name, result->labs, key.name,
|
|
key.labs, &m);
|
|
while(result) { /* go up until qname is subdomain of stub */
|
|
if(result->labs <= m)
|
|
break;
|
|
result = result->parent;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
struct addr_tree_node* addr_tree_lookup(rbtree_t* tree,
|
|
struct sockaddr_storage* addr, socklen_t addrlen)
|
|
{
|
|
rbnode_t* res = NULL;
|
|
struct addr_tree_node* result;
|
|
struct addr_tree_node key;
|
|
key.node.key = &key;
|
|
memcpy(&key.addr, addr, addrlen);
|
|
key.addrlen = addrlen;
|
|
key.net = (addr_is_ip6(addr, addrlen)?128:32);
|
|
if(rbtree_find_less_equal(tree, &key, &res)) {
|
|
/* exact */
|
|
return (struct addr_tree_node*)res;
|
|
} else {
|
|
/* smaller element (or no element) */
|
|
int m;
|
|
result = (struct addr_tree_node*)res;
|
|
if(!result || result->addrlen != addrlen)
|
|
return 0;
|
|
/* count number of bits matched */
|
|
m = addr_in_common(&result->addr, result->net, addr,
|
|
key.net, addrlen);
|
|
while(result) { /* go up until addr is inside netblock */
|
|
if(result->net <= m)
|
|
break;
|
|
result = result->parent;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
int
|
|
name_tree_next_root(rbtree_t* tree, uint16_t* dclass)
|
|
{
|
|
struct name_tree_node key;
|
|
rbnode_t* n;
|
|
struct name_tree_node* p;
|
|
if(*dclass == 0) {
|
|
/* first root item is first item in tree */
|
|
n = rbtree_first(tree);
|
|
if(n == RBTREE_NULL)
|
|
return 0;
|
|
p = (struct name_tree_node*)n;
|
|
if(dname_is_root(p->name)) {
|
|
*dclass = p->dclass;
|
|
return 1;
|
|
}
|
|
/* root not first item? search for higher items */
|
|
*dclass = p->dclass + 1;
|
|
return name_tree_next_root(tree, dclass);
|
|
}
|
|
/* find class n in tree, we may get a direct hit, or if we don't
|
|
* this is the last item of the previous class so rbtree_next() takes
|
|
* us to the next root (if any) */
|
|
key.node.key = &key;
|
|
key.name = (uint8_t*)"\000";
|
|
key.len = 1;
|
|
key.labs = 0;
|
|
key.dclass = *dclass;
|
|
n = NULL;
|
|
if(rbtree_find_less_equal(tree, &key, &n)) {
|
|
/* exact */
|
|
return 1;
|
|
} else {
|
|
/* smaller element */
|
|
if(!n || n == RBTREE_NULL)
|
|
return 0; /* nothing found */
|
|
n = rbtree_next(n);
|
|
if(n == RBTREE_NULL)
|
|
return 0; /* no higher */
|
|
p = (struct name_tree_node*)n;
|
|
if(dname_is_root(p->name)) {
|
|
*dclass = p->dclass;
|
|
return 1;
|
|
}
|
|
/* not a root node, return next higher item */
|
|
*dclass = p->dclass+1;
|
|
return name_tree_next_root(tree, dclass);
|
|
}
|
|
}
|