monero/external/unbound/daemon/worker.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

179 lines
5.5 KiB
C

/*
* daemon/worker.h - worker that handles a pending list of requests.
*
* 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 describes the worker structure that holds a list of
* pending requests and handles them.
*/
#ifndef DAEMON_WORKER_H
#define DAEMON_WORKER_H
#include "libunbound/worker.h"
#include "util/netevent.h"
#include "util/locks.h"
#include "util/alloc.h"
#include "util/data/msgreply.h"
#include "util/data/msgparse.h"
#include "daemon/stats.h"
#include "util/module.h"
#include "dnstap/dnstap.h"
struct listen_dnsport;
struct outside_network;
struct config_file;
struct daemon;
struct listen_port;
struct ub_randstate;
struct regional;
struct tube;
struct daemon_remote;
struct query_info;
/** worker commands */
enum worker_commands {
/** make the worker quit */
worker_cmd_quit,
/** obtain statistics */
worker_cmd_stats,
/** obtain statistics without statsclear */
worker_cmd_stats_noreset,
/** execute remote control command */
worker_cmd_remote
};
/**
* Structure holding working information for unbound.
* Holds globally visible information.
*/
struct worker {
/** the thread number (in daemon array). First in struct for debug. */
int thread_num;
/** global shared daemon structure */
struct daemon* daemon;
/** thread id */
ub_thread_type thr_id;
/** pipe, for commands for this worker */
struct tube* cmd;
/** the event base this worker works with */
struct comm_base* base;
/** the frontside listening interface where request events come in */
struct listen_dnsport* front;
/** the backside outside network interface to the auth servers */
struct outside_network* back;
/** ports to be used by this worker. */
int* ports;
/** number of ports for this worker */
int numports;
/** the signal handler */
struct comm_signal* comsig;
/** commpoint to listen to commands. */
struct comm_point* cmd_com;
/** timer for statistics */
struct comm_timer* stat_timer;
/** ratelimit for errors, time value */
time_t err_limit_time;
/** ratelimit for errors, packet count */
unsigned int err_limit_count;
/** random() table for this worker. */
struct ub_randstate* rndstate;
/** do we need to restart or quit (on signal) */
int need_to_exit;
/** allocation cache for this thread */
struct alloc_cache alloc;
/** per thread statistics */
struct server_stats stats;
/** thread scratch regional */
struct regional* scratchpad;
/** module environment passed to modules, changed for this thread */
struct module_env env;
#ifdef USE_DNSTAP
/** dnstap environment, changed for this thread */
struct dt_env dtenv;
#endif
};
/**
* Create the worker structure. Bare bones version, zeroed struct,
* with backpointers only. Use worker_init on it later.
* @param daemon: the daemon that this worker thread is part of.
* @param id: the thread number from 0.. numthreads-1.
* @param ports: the ports it is allowed to use, array.
* @param n: the number of ports.
* @return: the new worker or NULL on alloc failure.
*/
struct worker* worker_create(struct daemon* daemon, int id, int* ports, int n);
/**
* Initialize worker.
* Allocates event base, listens to ports
* @param worker: worker to initialize, created with worker_create.
* @param cfg: configuration settings.
* @param ports: list of shared query ports.
* @param do_sigs: if true, worker installs signal handlers.
* @return: false on error.
*/
int worker_init(struct worker* worker, struct config_file *cfg,
struct listen_port* ports, int do_sigs);
/**
* Make worker work.
*/
void worker_work(struct worker* worker);
/**
* Delete worker.
*/
void worker_delete(struct worker* worker);
/**
* Send a command to a worker. Uses blocking writes.
* @param worker: worker to send command to.
* @param cmd: command to send.
*/
void worker_send_cmd(struct worker* worker, enum worker_commands cmd);
/**
* Init worker stats - includes server_stats_init, outside network and mesh.
* @param worker: the worker to init
*/
void worker_stats_clear(struct worker* worker);
#endif /* DAEMON_WORKER_H */