2 * daemon/worker.h - worker that handles a pending list of requests.
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
6 * This software is open source.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
19 * Neither the name of the NLNET LABS nor the names of its contributors may
20 * be used to endorse or promote products derived from this software without
21 * specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 * This file describes the worker structure that holds a list of
40 * pending requests and handles them.
43 #ifndef DAEMON_WORKER_H
44 #define DAEMON_WORKER_H
46 #include "libunbound/worker.h"
47 #include "util/netevent.h"
48 #include "util/locks.h"
49 #include "util/alloc.h"
50 #include "util/data/msgreply.h"
51 #include "util/data/msgparse.h"
52 #include "daemon/stats.h"
53 #include "util/module.h"
54 #include "dnstap/dnstap.h"
55 struct listen_dnsport;
56 struct outside_network;
65 /** worker commands */
66 enum worker_commands {
67 /** make the worker quit */
69 /** obtain statistics */
71 /** obtain statistics without statsclear */
72 worker_cmd_stats_noreset,
73 /** execute remote control command */
78 * Structure holding working information for unbound.
79 * Holds globally visible information.
82 /** the thread number (in daemon array). First in struct for debug. */
84 /** global shared daemon structure */
85 struct daemon* daemon;
88 /** pipe, for commands for this worker */
90 /** the event base this worker works with */
91 struct comm_base* base;
92 /** the frontside listening interface where request events come in */
93 struct listen_dnsport* front;
94 /** the backside outside network interface to the auth servers */
95 struct outside_network* back;
96 /** ports to be used by this worker. */
98 /** number of ports for this worker */
100 /** the signal handler */
101 struct comm_signal* comsig;
102 /** commpoint to listen to commands. */
103 struct comm_point* cmd_com;
104 /** timer for statistics */
105 struct comm_timer* stat_timer;
106 /** ratelimit for errors, time value */
107 time_t err_limit_time;
108 /** ratelimit for errors, packet count */
109 unsigned int err_limit_count;
111 /** random() table for this worker. */
112 struct ub_randstate* rndstate;
113 /** do we need to restart or quit (on signal) */
115 /** allocation cache for this thread */
116 struct alloc_cache alloc;
117 /** per thread statistics */
118 struct server_stats stats;
119 /** thread scratch regional */
120 struct regional* scratchpad;
122 /** module environment passed to modules, changed for this thread */
123 struct module_env env;
126 /** dnstap environment, changed for this thread */
132 * Create the worker structure. Bare bones version, zeroed struct,
133 * with backpointers only. Use worker_init on it later.
134 * @param daemon: the daemon that this worker thread is part of.
135 * @param id: the thread number from 0.. numthreads-1.
136 * @param ports: the ports it is allowed to use, array.
137 * @param n: the number of ports.
138 * @return: the new worker or NULL on alloc failure.
140 struct worker* worker_create(struct daemon* daemon, int id, int* ports, int n);
144 * Allocates event base, listens to ports
145 * @param worker: worker to initialize, created with worker_create.
146 * @param cfg: configuration settings.
147 * @param ports: list of shared query ports.
148 * @param do_sigs: if true, worker installs signal handlers.
149 * @return: false on error.
151 int worker_init(struct worker* worker, struct config_file *cfg,
152 struct listen_port* ports, int do_sigs);
157 void worker_work(struct worker* worker);
162 void worker_delete(struct worker* worker);
165 * Send a command to a worker. Uses blocking writes.
166 * @param worker: worker to send command to.
167 * @param cmd: command to send.
169 void worker_send_cmd(struct worker* worker, enum worker_commands cmd);
172 * Init worker stats - includes server_stats_init, outside network and mesh.
173 * @param worker: the worker to init
175 void worker_stats_clear(struct worker* worker);
177 #endif /* DAEMON_WORKER_H */