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https://github.com/mailscope/kumomta.git
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Wez Furlong
42bf5c5e61
We've been hoping that mkdocs-material will ship the much anticipated search enhancements for some time, but it's time to recognize that we need to do something to improve the search results with how things work right now. This is a big commit that changes the titles of the various pages from the code-annotated synopsis to just the name of the function. This makes it much easier now to match things like `kumo.reject` directly, but `reject` remains awkward to find. I think this is the best that we can do at this time. A few functions have been annotated with the `status: deprecated` to show as deprecated in the toc/nav (shows with a little trash can next to the name).
68 lines
2.4 KiB
Markdown
68 lines
2.4 KiB
Markdown
# configure_resolver
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```lua
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kumo.dns.configure_resolver { PARAMS }
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```
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{{since('2023.08.22-4d895015')}}
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By default, KumoMTA will parse the system resolver configuration and use that
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to drive its internal caching [Hickory
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DNS](https://github.com/hickory-dns/hickory-dns) resolver.
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This function allows you to configure DNS resolving differently from
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your system configuration.
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!!! note
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This function should be called only from inside your
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[init](../events/init.md) event handler.
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`PARAMS` is a lua table with the following fields:
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* `name_servers` - required; a list of name servers. Each entry can be either a
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simple string of the form `"IP:PORT"` or can be a lua table that allows
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specifying the protocol that should be used.
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* `domain` - optional; the local dns domain name to append to names.
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Note that MX resolution in KumoMTA always appends a trailing `.` to
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the names from the envelope addresses so this setting should be
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irrelevant for MX resolution.
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* `search` - optional; list of additional search domains.
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Note that MX resolution in KumoMTA always appends a trailing `.` to
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the names from the envelope addresses so this setting should be
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irrelevant for MX resolution.
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* `options` - a lua table listing out additional resolver options.
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The possible names, values and meanings are documented in
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the hickory DNS resolver documentation; see the table below:
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|KumoMTA Version|Hickory DNS ResolverOpts|
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|---------------|------------------------|
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|2025.03.19-1d3f1f67|[hickory DNS 0.24](https://docs.rs/hickory-resolver/0.24.1/hickory_resolver/config/struct.ResolverOpts.html)|
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|2025.05.06-b29689af|[hickory DNS 0.25](https://docs.rs/hickory-resolver/0.25.1/hickory_resolver/config/struct.ResolverOpts.html)|
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```lua
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kumo.on('init', function()
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kumo.dns.configure_resolver {
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name_servers = {
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-- Simple UDP based entry
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'10.0.0.1:53',
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-- Use tcp with a controlled local address
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{
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socket_addr = '10.0.0.20:53',
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protocol = 'tcp',
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-- an NXDOMAIN entry will be treated as truth and
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-- we won't query other nameservers to see if they
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-- can resolve a given query
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trust_negative_responses = true,
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bind_addr = '10.0.0.2:0',
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},
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},
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options = {
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edns0 = true,
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use_hosts_file = 'Auto',
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},
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}
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end)
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```
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See also [kumo.dns.configure_unbound_resolver](configure_unbound_resolver.md).
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