2 * libunbound/worker.h - worker thread or process that resolves
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
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39 * This file contains the worker process or thread that performs
40 * the DNS resolving and validation. The worker is called by a procedure
41 * and if in the background continues until exit, if in the foreground
42 * returns from the procedure when done.
44 #ifndef LIBUNBOUND_WORKER_H
45 #define LIBUNBOUND_WORKER_H
46 #include "util/data/packed_rrset.h"
51 struct outside_network;
54 struct outbound_entry;
62 * The library-worker status structure
63 * Internal to the worker.
66 /** every worker has a unique thread_num. (first in struct) */
68 /** context we are operating under */
71 /** is this the bg worker? */
73 /** is this a bg worker that is threaded (not forked)? */
76 /** copy of the module environment with worker local entries. */
77 struct module_env* env;
78 /** the event base this worker works with */
79 struct comm_base* base;
80 /** the backside outside network interface to the auth servers */
81 struct outside_network* back;
82 /** random() table for this worker. */
83 struct ub_randstate* rndstate;
84 /** sslcontext for SSL wrapped DNS over TCP queries */
89 * Create a background worker
90 * @param ctx: is updated with pid/tid of the background worker.
91 * a new allocation cache is obtained from ctx. It contains the
92 * threadnumber and unique id for further (shared) cache insertions.
93 * @return 0 if OK, else error.
94 * Further communication is done via the pipes in ctx.
96 int libworker_bg(struct ub_ctx* ctx);
99 * Create a foreground worker.
100 * This worker will join the threadpool of resolver threads.
101 * It exits when the query answer has been obtained (or error).
102 * This routine blocks until the worker is finished.
103 * @param ctx: new allocation cache obtained and returned to it.
104 * @param q: query (result is stored in here).
105 * @return 0 if finished OK, else error.
107 int libworker_fg(struct ub_ctx* ctx, struct ctx_query* q);
109 /** cleanup the cache to remove all rrset IDs from it, arg is libworker */
110 void libworker_alloc_cleanup(void* arg);
113 * Worker service routine to send serviced queries to authoritative servers.
114 * @param qname: query name. (host order)
115 * @param qnamelen: length in bytes of qname, including trailing 0.
116 * @param qtype: query type. (host order)
117 * @param qclass: query class. (host order)
118 * @param flags: host order flags word, with opcode and CD bit.
119 * @param dnssec: if set, EDNS record will have DO bit set.
120 * @param want_dnssec: signatures needed.
121 * @param addr: where to.
122 * @param addrlen: length of addr.
123 * @param zone: delegation point name.
124 * @param zonelen: length of zone name wireformat dname.
125 * @param q: wich query state to reactivate upon return.
126 * @return: false on failure (memory or socket related). no query was
129 struct outbound_entry* libworker_send_query(uint8_t* qname, size_t qnamelen,
130 uint16_t qtype, uint16_t qclass, uint16_t flags, int dnssec,
131 int want_dnssec, struct sockaddr_storage* addr, socklen_t addrlen,
132 uint8_t* zone, size_t zonelen, struct module_qstate* q);
134 /** process incoming replies from the network */
135 int libworker_handle_reply(struct comm_point* c, void* arg, int error,
136 struct comm_reply* reply_info);
138 /** process incoming serviced query replies from the network */
139 int libworker_handle_service_reply(struct comm_point* c, void* arg, int error,
140 struct comm_reply* reply_info);
142 /** handle control command coming into server */
143 void libworker_handle_control_cmd(struct tube* tube, uint8_t* msg, size_t len,
146 /** handle opportunity to write result back */
147 void libworker_handle_result_write(struct tube* tube, uint8_t* msg, size_t len,
150 /** mesh callback with fg results */
151 void libworker_fg_done_cb(void* arg, int rcode, ldns_buffer* buf,
152 enum sec_status s, char* why_bogus);
154 /** mesh callback with bg results */
155 void libworker_bg_done_cb(void* arg, int rcode, ldns_buffer* buf,
156 enum sec_status s, char* why_bogus);
159 * fill result from parsed message, on error fills servfail
160 * @param res: is clear at start, filled in at end.
161 * @param buf: contains DNS message.
162 * @param temp: temporary buffer for parse.
163 * @param msg_security: security status of the DNS message.
164 * On error, the res may contain a different status
165 * (out of memory is not secure, not bogus).
167 void libworker_enter_result(struct ub_result* res, ldns_buffer* buf,
168 struct regional* temp, enum sec_status msg_security);
170 #endif /* LIBUNBOUND_WORKER_H */