mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-21 18:27:22 +00:00
335c7cda12
Release notes at https://www.nlnetlabs.nl/news/2024/May/08/unbound-1.20.0-released/ Security: The DNSBomb vulnerability CVE-2024-33655 Merge commit 'c2a80056864d6eda0398fd127dc0ae515b39752b' into main
129 lines
4.4 KiB
C
129 lines
4.4 KiB
C
/*
|
|
* cachedb/cachedb.h - cache from a database external to the program module
|
|
*
|
|
* Copyright (c) 2016, 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 a module that uses an external database to cache
|
|
* dns responses.
|
|
*/
|
|
#include "util/module.h"
|
|
struct cachedb_backend;
|
|
struct module_stack;
|
|
|
|
/**
|
|
* The global variable environment contents for the cachedb
|
|
* Shared between threads, this represents long term information.
|
|
* Like database connections.
|
|
*/
|
|
struct cachedb_env {
|
|
/** true is cachedb is enabled, the backend is turned on */
|
|
int enabled;
|
|
|
|
/** the backend routines */
|
|
struct cachedb_backend* backend;
|
|
|
|
/** backend specific data here */
|
|
void* backend_data;
|
|
};
|
|
|
|
/**
|
|
* Per query state for the cachedb module.
|
|
*/
|
|
struct cachedb_qstate {
|
|
int todo;
|
|
};
|
|
|
|
/**
|
|
* Backend call routines
|
|
*/
|
|
struct cachedb_backend {
|
|
/** backend name */
|
|
const char* name;
|
|
|
|
/** Init(env, cachedb_env): false on setup failure */
|
|
int (*init)(struct module_env*, struct cachedb_env*);
|
|
|
|
/** Deinit - close db for program exit */
|
|
void (*deinit)(struct module_env*, struct cachedb_env*);
|
|
|
|
/** Lookup (env, cachedb_env, key, result_buffer): true if found */
|
|
int (*lookup)(struct module_env*, struct cachedb_env*, char*,
|
|
struct sldns_buffer*);
|
|
|
|
/** Store (env, cachedb_env, key, data, data_len) */
|
|
void (*store)(struct module_env*, struct cachedb_env*, char*,
|
|
uint8_t*, size_t, time_t);
|
|
};
|
|
|
|
#define CACHEDB_HASHSIZE 256 /* bit hash */
|
|
|
|
/** Init the cachedb module */
|
|
int cachedb_init(struct module_env* env, int id);
|
|
/** Deinit the cachedb module */
|
|
void cachedb_deinit(struct module_env* env, int id);
|
|
/** Operate on an event on a query (in qstate). */
|
|
void cachedb_operate(struct module_qstate* qstate, enum module_ev event,
|
|
int id, struct outbound_entry* outbound);
|
|
/** Subordinate query done, inform this super request of its conclusion */
|
|
void cachedb_inform_super(struct module_qstate* qstate, int id,
|
|
struct module_qstate* super);
|
|
/** clear the cachedb query-specific contents out of qstate */
|
|
void cachedb_clear(struct module_qstate* qstate, int id);
|
|
/** return memory estimate for cachedb module */
|
|
size_t cachedb_get_mem(struct module_env* env, int id);
|
|
|
|
/**
|
|
* Get the function block with pointers to the cachedb functions
|
|
* @return the function block for "cachedb".
|
|
*/
|
|
struct module_func_block* cachedb_get_funcblock(void);
|
|
|
|
/**
|
|
* See if the cachedb is enabled.
|
|
* @param mods: module stack. It finds the cachedb module environment.
|
|
* @param env: module environment.
|
|
* @return true if exists and enabled.
|
|
*/
|
|
int cachedb_is_enabled(struct module_stack* mods, struct module_env* env);
|
|
|
|
/**
|
|
* Remove a message from the global cache. Because edns subnet has a more
|
|
* specific entry, and if not removed when everything expires, the global
|
|
* entry is used, instead of a fresh lookup of the edns subnet entry.
|
|
* @param qstate: query state.
|
|
*/
|
|
void cachedb_msg_remove(struct module_qstate* qstate);
|