Functions
iter_fwd.c File Reference

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

#include "config.h"
#include "iterator/iter_fwd.h"
#include "iterator/iter_delegpt.h"
#include "util/log.h"
#include "util/config_file.h"
#include "util/net_help.h"
#include "util/data/dname.h"
#include "ldns/rrdef.h"
#include "ldns/str2wire.h"

Functions

int fwd_cmp (const void *k1, const void *k2)
 compare two fwd entries
 
struct iter_forwardsforwards_create (void)
 Create forwards. More...
 
static void fwd_zone_free (struct iter_forward_zone *n)
 
static void delfwdnode (rbnode_t *n, void *ATTR_UNUSED(arg))
 
static void fwd_del_tree (struct iter_forwards *fwd)
 
void forwards_delete (struct iter_forwards *fwd)
 Delete forwards. More...
 
static int forwards_insert_data (struct iter_forwards *fwd, uint16_t c, uint8_t *nm, size_t nmlen, int nmlabs, struct delegpt *dp)
 insert info into forward structure
 
static int forwards_insert (struct iter_forwards *fwd, uint16_t c, struct delegpt *dp)
 insert new info into forward structure given dp
 
static void fwd_init_parents (struct iter_forwards *fwd)
 initialise parent pointers in the tree
 
static struct delegptread_fwds_name (struct config_stub *s)
 set zone name
 
static int read_fwds_host (struct config_stub *s, struct delegpt *dp)
 set fwd host names
 
static int read_fwds_addr (struct config_stub *s, struct delegpt *dp)
 set fwd server addresses
 
static int read_forwards (struct iter_forwards *fwd, struct config_file *cfg)
 read forwards config
 
static int fwd_add_stub_hole (struct iter_forwards *fwd, uint16_t c, uint8_t *nm)
 insert a stub hole (if necessary) for stub name
 
static int make_stub_holes (struct iter_forwards *fwd, struct config_file *cfg)
 make NULL entries for stubs
 
int forwards_apply_cfg (struct iter_forwards *fwd, struct config_file *cfg)
 Process forwards config. More...
 
struct delegptforwards_find (struct iter_forwards *fwd, uint8_t *qname, uint16_t qclass)
 Find forward zone exactly by name. More...
 
struct delegptforwards_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 delegptforwards_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 *dclass)
 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...
 
static struct iter_forward_zonefwd_zone_find (struct iter_forwards *fwd, uint16_t c, uint8_t *nm)
 
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 config settings.

Function Documentation

struct iter_forwards* forwards_create ( void  )

Create forwards.

Returns
new forwards or NULL on error.

Referenced by check_fwd(), libworker_setup(), and worker_init().

void forwards_delete ( struct iter_forwards fwd)

Delete forwards.

Parameters
fwdto delete.

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

int forwards_apply_cfg ( struct iter_forwards fwd,
struct config_file cfg 
)

Process forwards config.

Parameters
fwdwhere to store.
cfgconfig options.
Returns
0 on error.

References fwd_cmp(), fwd_init_parents(), make_stub_holes(), rbtree_create(), read_forwards(), and iter_forwards::tree.

Referenced by check_fwd(), libworker_setup(), and worker_init().

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

Find forward zone exactly by name.

Parameters
fwdforward storage.
qnameThe qname of the query.
qclassThe qclass of the query.
Returns
: A delegation point or null.

References iter_forward_zone::dclass, dname_count_size_labels(), rbnode_t::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().

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
fwdforward storage.
qnameThe qname of the query.
qclassThe 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_t::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(), and print_root_fwds().

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

Same as forwards_lookup, but for the root only.

Parameters
fwdforward storage.
qclassThe qclass of the query.
Returns
: A delegation point if root forward exists, otherwise null.

References forwards_lookup().

Referenced by processInitRequest().

int forwards_next_root ( struct iter_forwards fwd,
uint16_t *  qclass 
)

Find next root item in forwards lookup tree.

Parameters
fwdthe forward storage
qclassclass 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(), forwards_next_root(), rbnode_t::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 forwards_next_root(), and iter_get_next_root().

size_t forwards_get_mem ( struct iter_forwards fwd)

Get memory in use by forward storage.

Parameters
fwdforward storage.
Returns
bytes in use

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

Referenced by worker_mem_report().

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
fwdthe forward data structure
cclass of zone
dpdelegation point with name and target nameservers for new forward zone. malloced.
Returns
false on failure (out of memory);

References forwards_insert(), fwd_init_parents(), delegpt::name, iter_forward_zone::node, rbtree_delete(), and iter_forwards::tree.

Referenced by do_forward(), and do_forward_add().

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
fwdthe forward data structure
cclass of zone
nmname of zone (in uncompressed wireformat).

References fwd_init_parents(), iter_forward_zone::node, rbtree_delete(), and iter_forwards::tree.

Referenced by do_forward(), and do_forward_remove().

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
fwdthe forward data structure
cclass of zone
nmname of zone (in uncompressed wireformat).
Returns
false on failure (out of memory);

References fwd_add_stub_hole(), and fwd_init_parents().

Referenced by do_stub_add().

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

Remove stub hole, if one exists.

Parameters
fwdthe forward data structure
cclass of zone
nmname of zone (in uncompressed wireformat).

References iter_forward_zone::dp, fwd_init_parents(), iter_forward_zone::node, rbtree_delete(), and iter_forwards::tree.

Referenced by do_stub_add(), and do_stub_remove().