This file contains functions to assist the iterator module. More...

#include "util/rbtree.h"

Data Structures
struct	iter_forwards
	Iterator forward zones structure. More...

struct	iter_forward_zone
	Iterator forward servers for a particular zone. More...

Functions
struct iter_forwards *	forwards_create (void)
	Create forwards. More...

void	forwards_delete (struct iter_forwards *fwd)
	Delete forwards. More...

int	forwards_apply_cfg (struct iter_forwards fwd, struct config_file cfg)
	Process forwards config. More...

struct delegpt *	forwards_find (struct iter_forwards fwd, uint8_t qname, uint16_t qclass)
	Find forward zone exactly by name. More...

struct delegpt *	forwards_lookup (struct iter_forwards fwd, uint8_t qname, uint16_t qclass)
	Find forward zone information For this qname/qclass find forward zone information, returns delegation point with server names and addresses, or NULL if no forwarding is needed. More...

struct delegpt *	forwards_lookup_root (struct iter_forwards *fwd, uint16_t qclass)
	Same as forwards_lookup, but for the root only. More...

int	forwards_next_root (struct iter_forwards fwd, uint16_t qclass)
	Find next root item in forwards lookup tree. More...

size_t	forwards_get_mem (struct iter_forwards *fwd)
	Get memory in use by forward storage. More...

int	fwd_cmp (const void k1, const void k2)
	compare two fwd entries

int	forwards_add_zone (struct iter_forwards fwd, uint16_t c, struct delegpt dp)
	Add zone to forward structure. More...

void	forwards_delete_zone (struct iter_forwards fwd, uint16_t c, uint8_t nm)
	Remove zone from forward structure. More...

int	forwards_add_stub_hole (struct iter_forwards fwd, uint16_t c, uint8_t nm)
	Add stub hole (empty entry in forward table, that makes resolution skip a forward-zone because the stub zone should override the forward zone). More...

void	forwards_delete_stub_hole (struct iter_forwards fwd, uint16_t c, uint8_t nm)
	Remove stub hole, if one exists. More...

Detailed Description

This file contains functions to assist the iterator module.

Keep track of forward zones, and read those from config.

Function Documentation

◆ forwards_create()

struct iter_forwards* forwards_create ( void )

Create forwards.

Returns: new forwards or NULL on error.

Referenced by check_fwd(), and libworker_setup().

◆ forwards_delete()

void forwards_delete ( struct iter_forwards * fwd )

Delete forwards.

Parameters

fwd	to delete.

Referenced by libworker_delete_env(), libworker_setup(), and worker_delete().

◆ forwards_apply_cfg()

int forwards_apply_cfg	(	struct iter_forwards *	fwd,
		struct config_file *	cfg
	)

Process forwards config.

Parameters

fwd	where to store.
cfg	config options.

Returns: 0 on error.

Referenced by check_fwd(), and libworker_setup().

◆ forwards_find()

struct delegpt* forwards_find	(	struct iter_forwards *	fwd,
		uint8_t *	qname,
		uint16_t	qclass
	)

Find forward zone exactly by name.

Parameters

fwd	forward storage.
qname	The qname of the query.
qclass	The qclass of the query.

Returns: : A delegation point or null.

References iter_forward_zone::dclass, dname_count_size_labels(), rbnode_type::key, iter_forward_zone::name, iter_forward_zone::namelabs, iter_forward_zone::namelen, iter_forward_zone::node, rbtree_search(), and iter_forwards::tree.

Referenced by can_have_last_resort().

◆ forwards_lookup()

struct delegpt* forwards_lookup	(	struct iter_forwards *	fwd,
		uint8_t *	qname,
		uint16_t	qclass
	)

Find forward zone information For this qname/qclass find forward zone information, returns delegation point with server names and addresses, or NULL if no forwarding is needed.

Parameters

fwd	forward storage.
qname	The qname of the query.
qclass	The qclass of the query.

Returns: : A delegation point if the query has to be forwarded to that list, otherwise null.

References iter_forward_zone::dclass, dname_count_size_labels(), dname_lab_cmp(), iter_forward_zone::dp, rbnode_type::key, iter_forward_zone::name, iter_forward_zone::namelabs, iter_forward_zone::namelen, iter_forward_zone::node, iter_forward_zone::parent, rbtree_find_less_equal(), and iter_forwards::tree.

Referenced by forward_request(), forwards_lookup_root(), iter_stub_fwd_no_cache(), and print_root_fwds().

◆ forwards_lookup_root()

struct delegpt* forwards_lookup_root	(	struct iter_forwards *	fwd,
		uint16_t	qclass
	)

Same as forwards_lookup, but for the root only.

Parameters

fwd	forward storage.
qclass	The qclass of the query.

Returns: : A delegation point if root forward exists, otherwise null.

References forwards_lookup().

◆ forwards_next_root()

int forwards_next_root	(	struct iter_forwards *	fwd,
		uint16_t *	qclass
	)

Find next root item in forwards lookup tree.

Parameters

fwd	the forward storage
qclass	class to look at next, or higher.

Returns: false if none found, or if true stored in qclass.

References iter_forward_zone::dclass, dname_is_root(), rbnode_type::key, iter_forward_zone::name, iter_forward_zone::namelabs, iter_forward_zone::namelen, iter_forward_zone::node, rbtree_find_less_equal(), rbtree_first(), rbtree_next(), RBTREE_NULL, and iter_forwards::tree.

Referenced by iter_get_next_root().

◆ forwards_get_mem()

size_t forwards_get_mem ( struct iter_forwards * fwd )

Get memory in use by forward storage.

Parameters

fwd	forward storage.

Returns: bytes in use

References delegpt_get_mem(), iter_forward_zone::dp, iter_forward_zone::namelen, RBTREE_FOR, and iter_forwards::tree.

◆ forwards_add_zone()

int forwards_add_zone	(	struct iter_forwards *	fwd,
		uint16_t	c,
		struct delegpt *	dp
	)

Add zone to forward structure.

For external use since it recalcs the tree parents.

Parameters

fwd	the forward data structure
c	class of zone
dp	delegation point with name and target nameservers for new forward zone. malloced.

Returns: false on failure (out of memory);

Referenced by do_forward().

◆ forwards_delete_zone()

void forwards_delete_zone	(	struct iter_forwards *	fwd,
		uint16_t	c,
		uint8_t *	nm
	)

Remove zone from forward structure.

For external use since it recalcs the tree parents.

Parameters

fwd	the forward data structure
c	class of zone
nm	name of zone (in uncompressed wireformat).

Referenced by do_forward().

◆ forwards_add_stub_hole()

int forwards_add_stub_hole	(	struct iter_forwards *	fwd,
		uint16_t	c,
		uint8_t *	nm
	)

Add stub hole (empty entry in forward table, that makes resolution skip a forward-zone because the stub zone should override the forward zone).

Does not add one if not necessary.

Parameters

fwd	the forward data structure
c	class of zone
nm	name of zone (in uncompressed wireformat).

Returns: false on failure (out of memory);

References fwd_add_stub_hole(), and fwd_init_parents().

◆ forwards_delete_stub_hole()

void forwards_delete_stub_hole	(	struct iter_forwards *	fwd,
		uint16_t	c,
		uint8_t *	nm
	)

Remove stub hole, if one exists.

Parameters

fwd	the forward data structure
c	class of zone
nm	name of zone (in uncompressed wireformat).

Data Structures

Functions

Detailed Description

Function Documentation

◆ forwards_create()

◆ forwards_delete()

◆ forwards_apply_cfg()

◆ forwards_find()

◆ forwards_lookup()

◆ forwards_lookup_root()

◆ forwards_next_root()

◆ forwards_get_mem()

◆ forwards_add_zone()

◆ forwards_delete_zone()

◆ forwards_add_stub_hole()

◆ forwards_delete_stub_hole()