95 lines
2.9 KiB
Plaintext
95 lines
2.9 KiB
Plaintext
#!rsc by RouterOS
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# RouterOS script: netwatch-dns
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# Copyright (c) 2022-2023 Christian Hesse <mail@eworm.de>
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# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
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#
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# monitor and manage dns/doh with netwatch
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# https://git.eworm.de/cgit/routeros-scripts/about/doc/netwatch-dns.md
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:local 0 "netwatch-dns";
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:global GlobalFunctionsReady;
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:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
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:global CertificateAvailable;
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:global EitherOr;
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:global LogPrintExit2;
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:global ParseKeyValueStore;
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:global ScriptLock;
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$ScriptLock $0;
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:if ([ /system/resource/get uptime ] < 5m) do={
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$LogPrintExit2 info $0 ("System just booted, giving netwatch some time to settle.") true;
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}
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:local DnsServers ({});
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:local DnsFallback ({});
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:local DnsCurrent [ /ip/dns/get servers ];
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:foreach Host in=[ /tool/netwatch/find where comment~"dns" !disabled ] do={
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:local HostVal [ /tool/netwatch/get $Host ];
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:local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
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:if ($HostVal->"status" = "up" && $HostInfo->"disabled" != true) do={
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:if ($HostInfo->"dns" = true) do={
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:set DnsServers ($DnsServers, $HostVal->"host");
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}
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:if ($HostInfo->"dns-fallback" = true) do={
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:set DnsFallback ($DnsFallback, $HostVal->"host");
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}
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}
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}
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:if ([ :len $DnsServers ] > 0) do={
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:if ($DnsServers != $DnsCurrent) do={
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$LogPrintExit2 info $0 ("Updating DNS servers: " . [ :tostr $DnsServers ]) false;
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/ip/dns/set servers=$DnsServers;
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/ip/dns/cache/flush;
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}
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} else={
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:if ([ :len $DnsFallback ] > 0) do={
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:if ($DnsFallback != $DnsCurrent) do={
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$LogPrintExit2 info $0 ("Updating DNS servers to fallback: " . \
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[ :tostr $DnsFallback ]) false;
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/ip/dns/set servers=$DnsFallback;
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/ip/dns/cache/flush;
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}
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}
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}
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:local DohServer "";
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:local DohCurrent [ /ip/dns/get use-doh-server ];
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:local DohCert "";
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:foreach Host in=[ /tool/netwatch/find where comment~"doh" !disabled ] do={
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:local HostVal [ /tool/netwatch/get $Host ];
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:local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
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:if ($HostVal->"status" = "up" && $HostInfo->"doh" = true && \
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$HostInfo->"disabled" != true && $DohServer = "") do={
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:set DohServer [ $EitherOr ($HostInfo->"doh-url") \
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("https://" . $HostVal->"host" . "/dns-query") ];
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:set DohCert ($HostInfo->"doh-cert");
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}
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}
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:if ($DohServer != "") do={
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:if ($DohServer != $DohCurrent) do={
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$LogPrintExit2 info $0 ("Updating DoH server: " . $DohServer) false;
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:if ([ :len $DohCert ] > 0) do={
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/ip/dns/set use-doh-server="";
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:if ([ $CertificateAvailable $DohCert ] = false) do={
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$LogPrintExit2 warning $0 ("Downloading certificate failed, trying without.") false;
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}
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}
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/ip/dns/set use-doh-server=$DohServer;
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/ip/dns/cache/flush;
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}
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} else={
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:if ($DohCurrent != "") do={
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$LogPrintExit2 info $0 ("DoH server (" . $DohCurrent . ") is down, disabling.") false;
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/ip/dns/set use-doh-server="";
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/ip/dns/cache/flush;
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}
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}
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