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smb.conf: add dns_zone_scavenging

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Add parameter dns_zone_scavenging to control dns zone scavenging.
Scavenging is disabled by default, as due to
https://bugzilla.samba.org/show_bug.cgi?id=12451 the ageing properties of
existing DNS entries are incorrect.

Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
This commit is contained in:
Gary Lockyer 2018-07-11 16:30:38 +12:00 committed by Andrew Bartlett
parent e186d6a06b
commit d871e0c84c
3 changed files with 25 additions and 0 deletions
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23
docs-xml/smbdotconf/domain/dnszonescavenging.xml Normal file
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@ -0,0 +1,23 @@
<samba:parameter name="dns zone scavenging"
context="G"
type="boolean"
xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
<description>
<para>
When enabled (the default is disabled) unused dynamic dns records are
periodically removed.
</para>
<warning><para>
This option should not be enabled for installations created with
versions of samba before 4.9. Doing this will result in the loss of
static DNS entries. This is due to a bug in previous versions
of samba (BUG 12451) which marked dynamic DNS records as static and
static records as dynamic.
</para></warning>
<note><para>
If one record for a DNS name is static (non-aging) then no other record
for that DNS name will be scavenged.
</para></note>
</description>
<value type="default">no</value>
</samba:parameter>

1
lib/param/loadparm.c
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@ -2778,6 +2778,7 @@ struct loadparm_context *loadparm_init(TALLOC_CTX *mem_ctx)
lpcfg_do_global_parameter(lp_ctx, "nsupdate command", "/usr/bin/nsupdate -g");
lpcfg_do_global_parameter(lp_ctx, "allow dns updates", "secure only");
lpcfg_do_global_parameter(lp_ctx, "dns zone scavenging", "False");
lpcfg_do_global_parameter(lp_ctx, "dns forwarder", "");
lpcfg_do_global_parameter(lp_ctx, "algorithmic rid base", "1000");

1
source3/param/loadparm.c
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@ -895,6 +895,7 @@ static void init_globals(struct loadparm_context *lp_ctx, bool reinit_globals)
Globals._preferred_master = Auto;
Globals.allow_dns_updates = DNS_UPDATE_SIGNED;
Globals.dns_zone_scavenging = false;
lpcfg_string_set(Globals.ctx, &Globals.ntp_signd_socket_directory,
get_dyn_NTP_SIGND_SOCKET_DIR());