monero/external/unbound/libunbound/libworker.h
Erik de Castro Lopo a85b5759f3 Upgrade unbound library
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).
2017-06-17 23:04:00 +10:00

152 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 */