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This commit is contained in:
Mark Andrews 1999-03-03 12:20:05 +00:00
parent b2f1f3b836
commit dfa22b7b17
1 changed files with 39 additions and 8 deletions
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47
doc/design/zone
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@ -1,7 +1,7 @@
Zones
$Id: zone,v 1.2 1999/02/26 21:32:10 marka Exp $
$Id: zone,v 1.3 1999/03/03 12:20:05 marka Exp $
Overview
@ -40,16 +40,27 @@ Overview
* dynamically leared sites (soa queries)
Zones also have versions associated with them, each of which, with
the exception of the current zone, has an expiry date.
Zones have two types of versions associated with them.
"How long are we going to keep them operationally?"
Type 1.
The image of the "current" zone when a AXFR out is in progress.
There may be several of these at once but they cease to need
to exist once the AXFR's on this version has completed.
Type 2.
These are virtual versions of the zone and are required to
support IXFR requests. While the entire contents of the old
version does not need to be kept, a change log needs to be
kept. An index into this log would be useful in speeding
up replies. These versions have an explict expiry date.
"How long are we going to keep them operationally?"
While there are expriry dates based on last update /
change time + expire. In practice holding the deltas
for a few refresh periods should be enough. If the network
and servers are up one is enough.
"How are we going to generate them from a master file?"
"How are we going to generate them from a master file?"
UPDATE should not be the only answer to this question.
We need a tool that takes the current zone & new zone.
Verifies the new zone, generates a delta and feeds this
@ -71,7 +82,7 @@ Overview
* signed / resigned
* maintaince
validate current soa
remove old deltas
remove old deltas / consolidation
purge stale rrsets (cache)
* notification
responding to
@ -89,6 +100,16 @@ Types:
dns_zone_forward
} dns_zonetypes_t;
typedef struct dns_ixfr dns_ixfr_t;
struct dns_ixfr {
unsigned int magic; /*IXFR*/
isc_uint32_t serial;
time_t expire;
unsigned int offset;
ISC_LINK(dns_ixfr_t) link;
};
struct dns_zone {
unsigned int magic; /* ZONE */
dns_name_t name;
@ -108,6 +129,7 @@ Types:
dns_scl_t *scl; /* tsig based acl */
} update;
char *database;
ISC_LIST(dns_ixfr_t) ixfr;
...
};
@ -116,7 +138,16 @@ Loading:
Functions:
void
dns_zone_init(dns_zone_t *, dns_rdataclass_t class, isc_mem_t *mxtc);
dns_zone_init(dns_zone_t * zone, dns_rdataclass_t class,
isc_mem_t *mxtc);
void
dns_zone_invalidate(dns_zone_t *);
dns_zone_invalidate(dns_zone_t *zone);
void
dns_ixfr_init(dns_ixfr_t *ixfr, unsigned long serial, time_t expire);
void
dns_ixfr_invalidate(dns_ixfr_t *ixfr);
dns_zone_axfrout(dns_zone_t *zone);