[master] null terminate strings for coverity

[master] better DDNS in DLZ; mysqldyn 3821. [contrib] Added a new "mysqldyn" DLZ module with dynamic update and transaction support. Thanks to Marty Lee for the contribution. [RT #35656] 3820. [func] The DLZ API doesn't pass the database version to the lookup() function; this can cause DLZ modules that allow dynamic updates to mishandle prerequisite checks. This has been corrected by adding a 'dbversion' field to the dns_clientinfo_t structure. [RT #35656]

[master] contrib: add bdbhpt DLZ module 3493. [contrib] Added BDBHPT dynamically-lodable DLZ module, contributed by Mark Goldfinch. [RT #32549]

[master] DLZ fixes - handle malformed answers from DLZ better: - handle dlz_lookup errors better: when the first lookup of a name returns an unexpected failure code, we return it to the caller rather than continuing on to look up the wildcard. we now only continue processing if the return from the first lookup was either ISC_R_SUCCESS or ISC_R_NOTFOUND. - improved backward-compatibility for dlz_version: added a DLZ_DLOPEN_AGE value indicating how many versions back from the current DLZ_DLOPEN_VERSION named will support

[master] fixed clientinfo version check 3466. [contrib] Corrected the DNS_CLIENTINFOMETHODS_VERSION check in DLZ example driver. [RT #32275]

use log callback, not fprintf in dlz_example.c

[master] pass client info to DLZ findzone method 3434. [bug] Pass client info to the DLZ findzone() entry point in addition to lookup(). This makes it possible for a database to answer differently whether it's authoritative for a name depending on the address of the client. [RT #31775]

[master] multiple-dlz/dlz-nxdomain 3432. [func] Multiple DLZ databases can now be configured. DLZ databases are searched in the order configured, unless set to "search no", in which case a zone can be configured to be retrieved from a particular DLZ database by using a "dlz <name>" option in the zone statement. DLZ databases can support type "master" and "redirect" zones. [RT #27597]

set $Id$

Revert "Re-created rt27597a for ongoing DLZ work" This reverts commit d731ee9121c3864839c3bdcd3b7ee603ec3999ff.

Re-created rt27597a for ongoing DLZ work

Revert accidental merge of unfinished DLZ work

checkpoint: multiple-DLZ functionality - multiple DLZ's can be specified, including multiple DLZ's using the same driver; e.g., two different back-ends both loaded by the dlopen driver - new "search" option can be specified in a DLZ indicating whether this DLZ database should be searched for unknown zones. The default is "yes". If "no", then the zone can only be found by named if it's registered in the zone table, which happens if the zone is configured for dynamic updates, or if "dlz <dlzname>" is specified in the zone statement. (The latter functionality is incomplete in this commit).

3176. [doc] Corrected example code and added a README to the sample external DLZ module in contrib/dlz/example. [RT #26215]

2989. [func] Added support for writable DLZ zones. (Contributed by Andrew Tridgell of the Samba project.) [RT #22629] 2988. [experimental] Added a "dlopen" DLZ driver, allowing the creation of external DLZ drivers that can be loaded as shared objects at runtime rather than linked with named. Currently this is switched on via a compile-time option, "configure --with-dlz-dlopen". Note: the syntax for configuring DLZ zones is likely to be refined in future releases. (Contributed by Andrew Tridgell of the Samba project.) [RT #22629] 2987. [func] Improve ease of configuring TKEY/GSS updates by adding a "tkey-gssapi-keytab" option. If set, updates will be allowed with any key matching a principal in the specified keytab file. "tkey-gssapi-credential" is no longer required and is expected to be deprecated. (Contributed by Andrew Tridgell of the Samba project.) [RT #22629]