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authorIndrajit Raychaudhuri <irc@indrajit.com>2023-03-25 18:51:34 -0500
committerIndrajit Raychaudhuri <irc@indrajit.com>2023-03-27 01:42:38 -0500
commitc6494f12f92746cc4603fceca6b1a22fed010b93 (patch)
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dns: T5113: Support custom port for name-server forwarders
Support custom port for name-server forwarders that would allow using custom ports in name server forwarders to enable forwarding to alternative name servers (unbound, stubby, dnscrypt-proxy etc.) operating on non-default port. This would also allow using DNS Over TLS in PowerDNS Recursor 4.6 onwards (pdns doesn't support certificate check for validity yet) by enabling 'dot-to-port-853'. This is set by default if compiled in with DoT support. See: https://doc.powerdns.com/recursor/settings.html#dot-to-port-853 This also partially implements T921, T2195 (DoT without certificate check). Implementation details: - In 'dns/forwarding' configuration, 'name-server' now allows optional 'port' (defaults to 53). - Instead of modifying 'name-server-ipv4-ipv6.xml.i' to add optional 'port', a new file 'name-server-ipv4-ipv6-port.xml.i' has been used to avoid impacting other places where it is reused because not all of them honor ports (mostly VPN related). - The `host:port` entries to be used by PowerDNS recursor config are normalized eagerly at the point of loading VyOS `Config` instead of doing them lazily while rendering the Jinja2 template to keep the implementation less intrusive. The alternative would entail making quite a bit of change in how 'vyos-hostsd' processes 'static' 'name_servers' entries or persists their runtime states.
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