context.c File Reference

This file contains the validator context structure. More...

#include "config.h"
#include "libunbound/context.h"
#include "util/module.h"
#include "util/config_file.h"
#include "util/net_help.h"
#include "services/modstack.h"
#include "services/localzone.h"
#include "services/cache/rrset.h"
#include "services/cache/infra.h"
#include "services/authzone.h"
#include "services/listen_dnsport.h"
#include "util/data/msgreply.h"
#include "util/storage/slabhash.h"
#include "util/edns.h"
#include "sldns/sbuffer.h"
#include "iterator/iter_fwd.h"
#include "iterator/iter_hints.h"

Macros
#define	NUM_ID_TRIES   100000
	How many times to try to find an unused query-id-number for async.

Functions
int	context_finalize (struct ub_ctx *ctx)
	finalize a context.
int	context_query_cmp (const void *a, const void *b)
	compare two ctx_query elements
void	context_query_delete (struct ctx_query *q)
	delete context query
static int	find_id (struct ub_ctx *ctx, int *id)
	find next useful id number of 0 on error
struct ctx_query *	context_new (struct ub_ctx *ctx, const char *name, int rrtype, int rrclass, ub_callback_type cb, ub_event_callback_type cb_event, void *cbarg)
	Create new query in context, add to querynum list.
struct alloc_cache *	context_obtain_alloc (struct ub_ctx *ctx, int locking)
	Get a new alloc.
void	context_release_alloc (struct ub_ctx *ctx, struct alloc_cache *alloc, int locking)
	Release an alloc.
uint8_t *	context_serialize_new_query (struct ctx_query *q, uint32_t *len)
	Serialize a context query that questions data.
struct ctx_query *	context_deserialize_new_query (struct ub_ctx *ctx, uint8_t *p, uint32_t len)
	Deserialize a new_query buffer.
struct ctx_query *	context_lookup_new_query (struct ub_ctx *ctx, uint8_t *p, uint32_t len)
	Lookup query from new_query buffer.
uint8_t *	context_serialize_answer (struct ctx_query *q, int err, sldns_buffer *pkt, uint32_t *len)
	Serialize a context_query result to hand back to user.
struct ctx_query *	context_deserialize_answer (struct ub_ctx *ctx, uint8_t *p, uint32_t len, int *err)
	Deserialize an answer buffer.
uint8_t *	context_serialize_cancel (struct ctx_query *q, uint32_t *len)
	Serialize a query cancellation.
struct ctx_query *	context_deserialize_cancel (struct ub_ctx *ctx, uint8_t *p, uint32_t len)
	Deserialize a cancel buffer.
uint8_t *	context_serialize_quit (uint32_t *len)
	Serialize a 'quit' command.
enum ub_ctx_cmd	context_serial_getcmd (uint8_t *p, uint32_t len)
	Obtain command code from serialized buffer.

Detailed Description

This file contains the validator context structure.

Function Documentation

context_finalize()

int context_finalize

(

struct ub_ctx *

ctx

)

finalize a context.

Parameters

ctx	context to finalize. creates shared data.

Returns

0 if OK, or errcode.

References module_env::alloc, module_env::auth_zones, auth_zones_apply_cfg(), module_env::cfg, cfg_apply_local_port_policy(), config_apply(), ctx_logfile_overridden, module_env::edns_strings, edns_strings_apply_cfg(), ub_ctx::env, ub_ctx::finalized, forwards_apply_cfg(), forwards_create(), module_env::fwds, HASH_DEFAULT_STARTARRAY, module_env::hints, hints_apply_cfg(), hints_create(), infra_adjust(), module_env::infra_cache, listen_setup_locks(), ub_ctx::local_zones, local_zones_apply_cfg(), local_zones_create(), log_edns_known_options(), log_file(), log_init(), ub_ctx::log_out, config_file::logfile, ub_ctx::logfile_override, ub_ctx::mods, modstack_call_init(), modstack_call_startup(), config_file::module_conf, module_env::msg_cache, config_file::msg_cache_size, config_file::msg_cache_slabs, msgreply_sizefunc(), ub_ctx::pipe_pid, query_info_compare(), module_env::rrset_cache, rrset_cache_adjust(), slabhash_create(), slabhash_delete(), slabhash_is_size(), UB_INITFAIL, UB_NOERROR, UB_NOMEM, config_file::use_syslog, VERB_ALGO, config_file::verbosity, and verbosity.

Referenced by ub_ctx_finalize(), ub_resolve(), ub_resolve_async(), and ub_resolve_event().

context_query_delete()

void context_query_delete

(

struct ctx_query *

q

)

delete context query

Parameters

q	query to delete, including message packet and prealloc result

References ctx_query::msg, ctx_query::res, and ub_resolve_free().

Referenced by add_bg_result(), delq(), libworker_bg_done_cb(), libworker_event_done_cb(), process_answer_detail(), ub_cancel(), ub_resolve(), and ub_resolve_async().

context_new()

struct ctx_query * context_new	(	struct ub_ctx *	ctx,
		const char *	name,
		int	rrtype,
		int	rrclass,
		ub_callback_type	cb,
		ub_event_callback_type	cb_event,
		void *	cbarg
	)

Create new query in context, add to querynum list.

Parameters

ctx	context
name	query name
rrtype	type
rrclass	class
cb	callback for async, or NULL for sync.
cb_event	event callback for async, or NULL for sync.
cbarg	user arg for async queries.

Returns

new ctx_query or NULL for malloc failure.

References ctx_query::async, ctx_query::cb, ctx_query::cb_arg, ctx_query::cb_event, ub_ctx::cfglock, find_id(), rbnode_type::key, ctx_query::node, ub_ctx::num_async, ub_result::qclass, ub_result::qname, ub_result::qtype, ub_ctx::queries, ctx_query::querynum, rbtree_insert(), and ctx_query::res.

Referenced by ub_resolve(), ub_resolve_async(), and ub_resolve_event().

context_obtain_alloc()

struct alloc_cache * context_obtain_alloc	(	struct ub_ctx *	ctx,
		int	locking
	)

Get a new alloc.

Creates a new one or uses a cached one.

Parameters

ctx	context
locking	if true, cfglock is locked while getting alloc.

Returns

an alloc, or NULL on mem error.

References alloc_init(), ub_ctx::alloc_list, ub_ctx::cfglock, alloc_cache::super, ub_ctx::superalloc, and ub_ctx::thr_next_num.

Referenced by libworker_setup().

context_release_alloc()

void context_release_alloc	(	struct ub_ctx *	ctx,
		struct alloc_cache *	alloc,
		int	locking
	)

Release an alloc.

Puts it into the cache.

Parameters

ctx	context
locking	if true, cfglock is locked while releasing alloc.
alloc	alloc to relinquish.

References ub_ctx::alloc_list, ub_ctx::cfglock, and alloc_cache::super.

Referenced by libworker_delete_env().

context_serialize_new_query()

uint8_t * context_serialize_new_query	(	struct ctx_query *	q,
		uint32_t *	len
	)

Serialize a context query that questions data.

This serializes the query name, type, ... As well as command code 'new_query'.

Parameters

q	context query
len	the length of the allocation is returned.

Returns

: an alloc, or NULL on mem error.

References ub_result::qclass, ub_result::qname, ub_result::qtype, ctx_query::querynum, ctx_query::res, and UB_LIBCMD_NEWQUERY.

Referenced by ub_resolve_async().

context_deserialize_new_query()

struct ctx_query * context_deserialize_new_query	(	struct ub_ctx *	ctx,
		uint8_t *	p,
		uint32_t	len
	)

Deserialize a new_query buffer.

Parameters

ctx	context
p	buffer serialized.
len	length of buffer.

Returns

new ctx_query or NULL for malloc failure.

add to query list

References ctx_query::async, rbnode_type::key, log_assert, ctx_query::node, ub_ctx::num_async, ub_result::qclass, ub_result::qname, ub_result::qtype, ub_ctx::queries, ctx_query::querynum, rbtree_insert(), ctx_query::res, and UB_LIBCMD_NEWQUERY.

Referenced by handle_newq().

context_lookup_new_query()

struct ctx_query * context_lookup_new_query	(	struct ub_ctx *	ctx,
		uint8_t *	p,
		uint32_t	len
	)

Lookup query from new_query buffer.

Parameters

ctx	context
p	buffer serialized.
len	length of buffer.

Returns

looked up ctx_query or NULL for malloc failure.

References ctx_query::async, log_assert, ub_ctx::queries, ctx_query::querynum, rbtree_search(), and UB_LIBCMD_NEWQUERY.

Referenced by handle_newq().

context_serialize_answer()

uint8_t * context_serialize_answer	(	struct ctx_query *	q,
		int	err,
		struct sldns_buffer *	pkt,
		uint32_t *	len
	)

Serialize a context_query result to hand back to user.

This serializes the query name, type, ..., and result. As well as command code 'answer'.

Parameters

q	context query
err	error code to pass to client.
pkt	the packet to add, can be NULL.
len	the length of the allocation is returned.

Returns

: an alloc, or NULL on mem error.

References ctx_query::msg_security, ctx_query::querynum, ctx_query::res, sldns_buffer_begin(), sldns_buffer_remaining(), UB_LIBCMD_ANSWER, ub_result::was_ratelimited, and ub_result::why_bogus.

Referenced by add_bg_result().

context_deserialize_answer()

struct ctx_query * context_deserialize_answer	(	struct ub_ctx *	ctx,
		uint8_t *	p,
		uint32_t	len,
		int *	err
	)

Deserialize an answer buffer.

Parameters

ctx	context
p	buffer serialized.
len	length of buffer.
err	error code to be returned to client is passed.

Returns

ctx_query with answer added or NULL for malloc failure.

References log_assert, memdup(), ctx_query::msg, ctx_query::msg_len, ctx_query::msg_security, ub_ctx::queries, rbtree_search(), ctx_query::res, UB_LIBCMD_ANSWER, UB_NOMEM, ub_result::was_ratelimited, and ub_result::why_bogus.

Referenced by process_answer_detail().

context_serialize_cancel()

uint8_t * context_serialize_cancel	(	struct ctx_query *	q,
		uint32_t *	len
	)

Serialize a query cancellation.

Serializes query async id as well as command code 'cancel'

Parameters

q	context query
len	the length of the allocation is returned.

Returns

: an alloc, or NULL on mem error.

References ctx_query::querynum, and UB_LIBCMD_CANCEL.

Referenced by ub_cancel().

context_deserialize_cancel()

struct ctx_query * context_deserialize_cancel	(	struct ub_ctx *	ctx,
		uint8_t *	p,
		uint32_t	len
	)

Deserialize a cancel buffer.

Parameters

ctx	context
p	buffer serialized.
len	length of buffer.

Returns

ctx_query to cancel or NULL for failure.

References log_assert, ub_ctx::queries, rbtree_search(), and UB_LIBCMD_CANCEL.

Referenced by handle_cancel().

context_serialize_quit()

uint8_t * context_serialize_quit

(

uint32_t *

len

)

Serialize a 'quit' command.

Parameters

len	the length of the allocation is returned.

Returns

: an alloc, or NULL on mem error.

References UB_LIBCMD_QUIT.

context_serial_getcmd()

enum ub_ctx_cmd context_serial_getcmd	(	uint8_t *	p,
		uint32_t	len
	)

Obtain command code from serialized buffer.

Parameters

p	buffer serialized.
len	length of buffer.

Returns

command code or QUIT on error.

References UB_LIBCMD_QUIT.

Referenced by libworker_do_cmd(), process_answer_detail(), and ub_stop_bg().