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document behavior of dns section. #2165

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document behavior of dns section. #2165

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8 changes: 8 additions & 0 deletions llarp/config/config.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -783,6 +783,11 @@ namespace llarp
DnsConfig::defineConfigOptions(ConfigDefinition& conf, const ConfigGenParameters& params)
{
(void)params;
conf.addSectionComments(
"dns",
{"This section is responsible for setting up dns subsystem."
"Any config items suffixed with a key suffixed with ':' (e.g. dns-cache-max:= 6000) are "
"forwarded to libunbound when it is configured on startup."});

// Most non-linux platforms have loopback as 127.0.0.1/32, but linux uses 127.0.0.1/8 so that we
// can bind to other 127.* IPs to avoid conflicting with something else that may be listening on
Expand Down Expand Up @@ -893,6 +898,9 @@ namespace llarp

// forward the rest to libunbound
conf.addUndeclaredHandler("dns", [this](auto, std::string_view key, std::string_view val) {
if (not ends_with(key, ":"))
throw std::invalid_argument{"Invalid option provided in dns config: '{}'"_format(key)};

m_ExtraOpts.emplace(key, val);
});
}
Expand Down