Add support for ndots to unbound resolver

[lgyurci]

Severity

Trivial

Versions

20.5.0

Components/Modules

Tested in pjsip, but probably an issue everywhere else

Operating Environment

Fedora 38

Frequency of Occurrence

Constant

Issue Description

As the title says.
Suppose you have a resolv.conf:

search anything.something.example.com something.example.com example.com
nameserver 10.0.0.1
options ndots:4

And an asterisk config snippet like:

[reg1]
type=registration
transport=transport-udp
client_uri=sip:[email protected]
server_uri=sip:[email protected]

Then asterisk will only try to resolve nothing.everything.local, and for example, not nothing.everything.local.example.com, like the underlying operating system would. While the workaround for this is easy, this causes confusion, especially in kubernetes environments. This way, the registrartion will be shown as rejected, while asterisk just couldn't resolve the domain properly, while everything else in the system could.

Relevant log output

No response

Asterisk Issue Guidelines

• Yes, I have read the Asterisk Issue Guidelines

[seanbright]

libunbound ignores those settings. We would have to implement this behavior ourselves.