153 lines
5.2 KiB
C
153 lines
5.2 KiB
C
/*
|
|
* libunbound/libworker.h - worker thread or process that resolves
|
|
*
|
|
* Copyright (c) 2007, 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 the worker process or thread that performs
|
|
* the DNS resolving and validation. The worker is called by a procedure
|
|
* and if in the background continues until exit, if in the foreground
|
|
* returns from the procedure when done.
|
|
*/
|
|
#ifndef LIBUNBOUND_LIBWORKER_H
|
|
#define LIBUNBOUND_LIBWORKER_H
|
|
#include "util/data/packed_rrset.h"
|
|
struct ub_ctx;
|
|
struct ub_result;
|
|
struct module_env;
|
|
struct comm_base;
|
|
struct outside_network;
|
|
struct ub_randstate;
|
|
struct ctx_query;
|
|
struct outbound_entry;
|
|
struct module_qstate;
|
|
struct comm_point;
|
|
struct comm_reply;
|
|
struct regional;
|
|
struct tube;
|
|
struct sldns_buffer;
|
|
struct ub_event_base;
|
|
struct query_info;
|
|
|
|
/**
|
|
* The library-worker status structure
|
|
* Internal to the worker.
|
|
*/
|
|
struct libworker {
|
|
/** every worker has a unique thread_num. (first in struct) */
|
|
int thread_num;
|
|
/** context we are operating under */
|
|
struct ub_ctx* ctx;
|
|
|
|
/** is this the bg worker? */
|
|
int is_bg;
|
|
/** is this a bg worker that is threaded (not forked)? */
|
|
int is_bg_thread;
|
|
|
|
/** copy of the module environment with worker local entries. */
|
|
struct module_env* env;
|
|
/** the event base this worker works with */
|
|
struct comm_base* base;
|
|
/** the backside outside network interface to the auth servers */
|
|
struct outside_network* back;
|
|
/** random() table for this worker. */
|
|
struct ub_randstate* rndstate;
|
|
/** sslcontext for SSL wrapped DNS over TCP queries */
|
|
void* sslctx;
|
|
};
|
|
|
|
/**
|
|
* Create a background worker
|
|
* @param ctx: is updated with pid/tid of the background worker.
|
|
* a new allocation cache is obtained from ctx. It contains the
|
|
* threadnumber and unique id for further (shared) cache insertions.
|
|
* @return 0 if OK, else error.
|
|
* Further communication is done via the pipes in ctx.
|
|
*/
|
|
int libworker_bg(struct ub_ctx* ctx);
|
|
|
|
/**
|
|
* Create a foreground worker.
|
|
* This worker will join the threadpool of resolver threads.
|
|
* It exits when the query answer has been obtained (or error).
|
|
* This routine blocks until the worker is finished.
|
|
* @param ctx: new allocation cache obtained and returned to it.
|
|
* @param q: query (result is stored in here).
|
|
* @return 0 if finished OK, else error.
|
|
*/
|
|
int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q);
|
|
|
|
/**
|
|
* create worker for event-based interface.
|
|
* @param ctx: context with config.
|
|
* @param eb: event base.
|
|
* @return new worker or NULL.
|
|
*/
|
|
struct libworker* libworker_create_event(struct ub_ctx* ctx,
|
|
struct ub_event_base* eb);
|
|
|
|
/**
|
|
* Attach context_query to mesh for callback in event-driven setup.
|
|
* @param ctx: context
|
|
* @param q: context query entry
|
|
* @param async_id: store query num if query takes long.
|
|
* @return 0 if finished OK, else error.
|
|
*/
|
|
int libworker_attach_mesh(struct ub_ctx* ctx, struct ctx_query* q,
|
|
int* async_id);
|
|
|
|
/**
|
|
* delete worker for event-based interface. does not free the event_base.
|
|
* @param w: event-based worker to delete.
|
|
*/
|
|
void libworker_delete_event(struct libworker* w);
|
|
|
|
/** cleanup the cache to remove all rrset IDs from it, arg is libworker */
|
|
void libworker_alloc_cleanup(void* arg);
|
|
|
|
/**
|
|
* fill result from parsed message, on error fills servfail
|
|
* @param res: is clear at start, filled in at end.
|
|
* @param buf: contains DNS message.
|
|
* @param temp: temporary buffer for parse.
|
|
* @param msg_security: security status of the DNS message.
|
|
* On error, the res may contain a different status
|
|
* (out of memory is not secure, not bogus).
|
|
*/
|
|
void libworker_enter_result(struct ub_result* res, struct sldns_buffer* buf,
|
|
struct regional* temp, enum sec_status msg_security);
|
|
|
|
#endif /* LIBUNBOUND_LIBWORKER_H */
|