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netwatch-dns: support downloading / importing certificate

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This commit is contained in:
Christian Hesse 2022-09-13 09:01:40 +02:00
parent 3988c70290
commit 220dd8f892
2 changed files with 16 additions and 0 deletions
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7
doc/netwatch-dns.md
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@ -43,6 +43,13 @@ Giving a specific query url for DoH is possible:
Note that using a name in DoH url may introduce a chicken-and-egg issue!
Importing a certificate automatically is possible, at least if available in
the repository (see `certs` sub directory).
/tool/netwatch/add comment="doh, doh-cert=DigiCert TLS Hybrid ECC SHA384 2020 CA1" host=1.1.1.1;
/tool/netwatch/add comment="doh, doh-cert=DigiCert TLS Hybrid ECC SHA384 2020 CA1" host=9.9.9.9;
/tool/netwatch/add comment="doh, doh-cert=GTS CA 1C3" host=8.8.8.8;
Sometimes using just one specific (possibly internal) DNS server may be
desired, with fallback in case it fails. This is possible as well:

9
netwatch-dns
View file

@ -10,6 +10,7 @@
:global GlobalFunctionsReady;
:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
:global CertificateAvailable;
:global EitherOr;
:global LogPrintExit2;
:global ParseKeyValueStore;
@ -58,6 +59,7 @@ $ScriptLock $0;
:local DohServer "";
:local DohCurrent [ /ip/dns/get use-doh-server ];
:local DohCert "";
:foreach Host in=[ /tool/netwatch/find where comment~"doh" !disabled ] do={
:local HostVal [ /tool/netwatch/get $Host ];
@ -67,12 +69,19 @@ $ScriptLock $0;
$HostInfo->"disabled" != true && $DohServer = "") do={
:set DohServer [ $EitherOr ($HostInfo->"doh-url") \
("https://" . $HostVal->"host" . "/dns-query") ];
:set DohCert ($HostInfo->"doh-cert");
}
}
:if ($DohServer != "") do={
:if ($DohServer != $DohCurrent) do={
$LogPrintExit2 info $0 ("Updating DoH server: " . $DohServer) false;
:if ([ :len $DohCert ] > 0) do={
/ip/dns/set use-doh-server="";
:if ([ $CertificateAvailable $DohCert ] = false) do={
$LogPrintExit2 warning $0 ("Downloading certificate failed, trying without.") false;
}
}
/ip/dns/set use-doh-server=$DohServer;
/ip/dns/cache/flush;
}