libworker.c File Reference

This file contains the worker process or thread that performs the DNS resolving and validation. More...

#include "config.h"
#include "libunbound/libworker.h"
#include "libunbound/context.h"
#include "libunbound/unbound.h"
#include "libunbound/worker.h"
#include "libunbound/unbound-event.h"
#include "services/outside_network.h"
#include "services/mesh.h"
#include "services/localzone.h"
#include "services/cache/rrset.h"
#include "services/outbound_list.h"
#include "services/authzone.h"
#include "util/fptr_wlist.h"
#include "util/module.h"
#include "util/regional.h"
#include "util/random.h"
#include "util/config_file.h"
#include "util/netevent.h"
#include "util/proxy_protocol.h"
#include "util/storage/lookup3.h"
#include "util/storage/slabhash.h"
#include "util/net_help.h"
#include "util/data/dname.h"
#include "util/data/msgreply.h"
#include "util/data/msgencode.h"
#include "util/tube.h"
#include "iterator/iter_fwd.h"
#include "iterator/iter_hints.h"
#include "sldns/sbuffer.h"
#include "sldns/str2wire.h"

Functions
static void	handle_newq (struct libworker *w, uint8_t *buf, uint32_t len)
	handle new query command for bg worker
static void	libworker_delete_env (struct libworker *w)
	delete libworker env
static void	libworker_delete (struct libworker *w)
	delete libworker struct
void	libworker_delete_event (struct libworker *w)
	delete worker for event-based interface. More...
static struct libworker *	libworker_setup (struct ub_ctx *ctx, int is_bg, struct ub_event_base *eb)
	setup fresh libworker struct
struct libworker *	libworker_create_event (struct ub_ctx *ctx, struct ub_event_base *eb)
	create worker for event-based interface. More...
static void	handle_cancel (struct libworker *w, uint8_t *buf, uint32_t len)
	handle cancel command for bg worker
static void	libworker_do_cmd (struct libworker *w, uint8_t *msg, uint32_t len)
	do control command coming into bg server
void	libworker_handle_control_cmd (struct tube *ATTR_UNUSED(tube), uint8_t *msg, size_t len, int err, void *arg)
	handle control command coming into server
static void *	libworker_dobg (void *arg)
	the background thread func
int	libworker_bg (struct ub_ctx *ctx)
	Create a background worker. More...
static int	fill_canon (struct ub_result *res, uint8_t *s)
	insert canonname
static int	fill_res (struct ub_result *res, struct ub_packed_rrset_key *answer, uint8_t *finalcname, struct query_info *rq, struct reply_info *rep)
	fill data into result
void	libworker_enter_result (struct ub_result *res, sldns_buffer *buf, struct regional *temp, enum sec_status msg_security)
	fill result from parsed message, on error fills servfail More...
static void	libworker_fillup_fg (struct ctx_query *q, int rcode, sldns_buffer *buf, enum sec_status s, char *why_bogus, int was_ratelimited)
	fillup fg results
void	libworker_fg_done_cb (void *arg, int rcode, sldns_buffer *buf, enum sec_status s, char *why_bogus, int was_ratelimited)
	mesh callback with fg results
static int	setup_qinfo_edns (struct libworker *w, struct ctx_query *q, struct query_info *qinfo, struct edns_data *edns)
	setup qinfo and edns
int	libworker_fg (struct ub_ctx *ctx, struct ctx_query *q)
	Create a foreground worker. More...
void	libworker_event_done_cb (void *arg, int rcode, sldns_buffer *buf, enum sec_status s, char *why_bogus, int was_ratelimited)
	mesh callback with event results
int	libworker_attach_mesh (struct ub_ctx *ctx, struct ctx_query *q, int *async_id)
	Attach context_query to mesh for callback in event-driven setup. More...
static void	add_bg_result (struct libworker *w, struct ctx_query *q, sldns_buffer *pkt, int err, char *reason, int was_ratelimited)
	add result to the bg worker result queue
void	libworker_bg_done_cb (void *arg, int rcode, sldns_buffer *buf, enum sec_status s, char *why_bogus, int was_ratelimited)
	mesh callback with bg results
void	libworker_alloc_cleanup (void *arg)
	cleanup the cache to remove all rrset IDs from it, arg is libworker
struct outbound_entry *	libworker_send_query (struct query_info *qinfo, uint16_t flags, int dnssec, int want_dnssec, int nocaps, int check_ratelimit, struct sockaddr_storage *addr, socklen_t addrlen, uint8_t *zone, size_t zonelen, int tcp_upstream, int ssl_upstream, char *tls_auth_name, struct module_qstate *q, int *was_ratelimited)
	Worker service routine to send serviced queries to authoritative servers. More...
int	libworker_handle_service_reply (struct comm_point *c, void *arg, int error, struct comm_reply *reply_info)
	process incoming serviced query replies from the network
void	worker_handle_control_cmd (struct tube *ATTR_UNUSED(tube), uint8_t *ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len), int ATTR_UNUSED(error), void *ATTR_UNUSED(arg))
int	worker_handle_request (struct comm_point *ATTR_UNUSED(c), void *ATTR_UNUSED(arg), int ATTR_UNUSED(error), struct comm_reply *ATTR_UNUSED(repinfo))
int	worker_handle_service_reply (struct comm_point *ATTR_UNUSED(c), void *ATTR_UNUSED(arg), int ATTR_UNUSED(error), struct comm_reply *ATTR_UNUSED(reply_info))
int	remote_accept_callback (struct comm_point *ATTR_UNUSED(c), void *ATTR_UNUSED(arg), int ATTR_UNUSED(error), struct comm_reply *ATTR_UNUSED(repinfo))
int	remote_control_callback (struct comm_point *ATTR_UNUSED(c), void *ATTR_UNUSED(arg), int ATTR_UNUSED(error), struct comm_reply *ATTR_UNUSED(repinfo))
void	worker_sighandler (int ATTR_UNUSED(sig), void *ATTR_UNUSED(arg))
struct outbound_entry *	worker_send_query (struct query_info *ATTR_UNUSED(qinfo), uint16_t ATTR_UNUSED(flags), int ATTR_UNUSED(dnssec), int ATTR_UNUSED(want_dnssec), int ATTR_UNUSED(nocaps), int ATTR_UNUSED(check_ratelimit), struct sockaddr_storage *ATTR_UNUSED(addr), socklen_t ATTR_UNUSED(addrlen), uint8_t *ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen), int ATTR_UNUSED(tcp_upstream), int ATTR_UNUSED(ssl_upstream), char *ATTR_UNUSED(tls_auth_name), struct module_qstate *ATTR_UNUSED(q), int *ATTR_UNUSED(was_ratelimited))
void	worker_alloc_cleanup (void *ATTR_UNUSED(arg))
void	worker_stat_timer_cb (void *ATTR_UNUSED(arg))
void	worker_probe_timer_cb (void *ATTR_UNUSED(arg))
void	worker_start_accept (void *ATTR_UNUSED(arg))
void	worker_stop_accept (void *ATTR_UNUSED(arg))
int	order_lock_cmp (const void *ATTR_UNUSED(e1), const void *ATTR_UNUSED(e2))
int	codeline_cmp (const void *ATTR_UNUSED(a), const void *ATTR_UNUSED(b))
int	replay_var_compare (const void *ATTR_UNUSED(a), const void *ATTR_UNUSED(b))
void	remote_get_opt_ssl (char *ATTR_UNUSED(str), void *ATTR_UNUSED(arg))

Detailed Description

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.

Function Documentation

libworker_delete_event()

void libworker_delete_event

(

struct libworker *

w

)

delete worker for event-based interface.

does not free the event_base.

Parameters

w	event-based worker to delete.

References libworker::base, comm_base_delete_no_base(), and libworker_delete_env().

Referenced by ub_ctx_set_event().

libworker_create_event()

struct libworker* libworker_create_event	(	struct ub_ctx *	ctx,
		struct ub_event_base *	eb
	)

create worker for event-based interface.

Parameters

ctx	context with config.
eb	event base.

Returns

new worker or NULL.

References libworker::ctx, and libworker_setup().

libworker_bg()

int libworker_bg

(

struct ub_ctx *

ctx

)

Create a background worker.

Parameters

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.

Returns

0 if OK, else error. Further communication is done via the pipes in ctx.

References ub_ctx::bg_pid, ub_ctx::bg_tid, ub_ctx::cfglock, libworker::ctx, ub_ctx::dothread, libworker::is_bg_thread, libworker_dobg(), libworker_setup(), libworker::thread_num, ub_ctx::thread_worker, UB_FORKFAIL, and UB_NOMEM.

Referenced by ub_resolve_async().

libworker_enter_result()

void libworker_enter_result	(	struct ub_result *	res,
		struct sldns_buffer *	buf,
		struct regional *	temp,
		enum sec_status	msg_security
	)

fill result from parsed message, on error fills servfail

Parameters

res	is clear at start, filled in at end.
buf	contains DNS message.
temp	temporary buffer for parse.
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).

References ub_result::rcode.

libworker_fg()

int libworker_fg	(	struct ub_ctx *	ctx,
		struct ctx_query *	q
	)

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.

Parameters

ctx	new allocation cache obtained and returned to it.
q	query (result is stored in here).

Returns

0 if finished OK, else error.

References libworker::back, BIT_RD, libworker::ctx, libworker::env, libworker_delete(), libworker_fillup_fg(), libworker_setup(), ub_ctx::local_zones, local_zones_answer(), regional_free_all(), module_env::scratch, setup_qinfo_edns(), sldns_buffer_write_u16_at(), UB_INITFAIL, UB_SYNTAX, outside_network::udp_buff, and ctx_query::w.

Referenced by ub_resolve().

libworker_attach_mesh()

int libworker_attach_mesh	(	struct ub_ctx *	ctx,
		struct ctx_query *	q,
		int *	async_id
	)

Attach context_query to mesh for callback in event-driven setup.

Parameters

ctx	context
q	context query entry
async_id	store query num if query takes long.

Returns

0 if finished OK, else error.

References libworker::back, BIT_RD, libworker::ctx, libworker::env, ub_ctx::event_worker, libworker_event_done_cb(), ub_ctx::local_zones, local_zones_answer(), query_info::qname, regional_free_all(), module_env::scratch, setup_qinfo_edns(), sldns_buffer_write_u16_at(), UB_INITFAIL, UB_SYNTAX, outside_network::udp_buff, and ctx_query::w.

libworker_send_query()

struct outbound_entry* libworker_send_query	(	struct query_info *	qinfo,
		uint16_t	flags,
		int	dnssec,
		int	want_dnssec,
		int	nocaps,
		int	check_ratelimit,
		struct sockaddr_storage *	addr,
		socklen_t	addrlen,
		uint8_t *	zone,
		size_t	zonelen,
		int	tcp_upstream,
		int	ssl_upstream,
		char *	tls_auth_name,
		struct module_qstate *	q,
		int *	was_ratelimited
	)

Worker service routine to send serviced queries to authoritative servers.

Parameters

qinfo	query info.
flags	host order flags word, with opcode and CD bit.
dnssec	if set, EDNS record will have DO bit set.
want_dnssec	signatures needed.
nocaps	ignore capsforid(if in config), do not perturb qname.
check_ratelimit	if set, will check ratelimit before sending out.
addr	where to.
addrlen	length of addr.
zone	delegation point name.
zonelen	length of zone name wireformat dname.
tcp_upstream	use TCP for upstream queries.
ssl_upstream	use SSL for upstream queries.
tls_auth_name	if ssl_upstream, use this name with TLS authentication.
q	which query state to reactivate upon return.
was_ratelimited	it will signal back if the query failed to pass the ratelimit check.

Returns

: false on failure (memory or socket related). no query was sent.

References libworker::back, module_qstate::env, libworker_handle_service_reply(), outnet_serviced_query(), module_qstate::region, regional_alloc(), outside_network::udp_buff, and module_env::worker.