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-rw-r--r--netwatch-dns.rsc183
1 files changed, 120 insertions, 63 deletions
diff --git a/netwatch-dns.rsc b/netwatch-dns.rsc
index 119a367..467d636 100644
--- a/netwatch-dns.rsc
+++ b/netwatch-dns.rsc
@@ -1,93 +1,150 @@
#!rsc by RouterOS
# RouterOS script: netwatch-dns
-# Copyright (c) 2022-2023 Christian Hesse <mail@eworm.de>
-# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
+# Copyright (c) 2022-2025 Christian Hesse <mail@eworm.de>
+# https://rsc.eworm.de/COPYING.md
+#
+# requires RouterOS, version=7.16
+# requires device-mode, fetch
#
# monitor and manage dns/doh with netwatch
-# https://git.eworm.de/cgit/routeros-scripts/about/doc/netwatch-dns.md
+# https://rsc.eworm.de/doc/netwatch-dns.md
-:local 0 "netwatch-dns";
:global GlobalFunctionsReady;
:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
-:global CertificateAvailable;
-:global EitherOr;
-:global LogPrintExit2;
-:global ParseKeyValueStore;
-:global ScriptLock;
+:local ExitOK false;
+:do {
+ :local ScriptName [ :jobname ];
-$ScriptLock $0;
+ :global CertificateAvailable;
+ :global EitherOr;
+ :global IsDNSResolving;
+ :global IsTimeSync;
+ :global LogPrint;
+ :global LogPrintOnce;
+ :global ParseKeyValueStore;
+ :global ScriptLock;
-:if ([ /system/resource/get uptime ] < 5m30s) do={
- $LogPrintExit2 info $0 ("System just booted, giving netwatch some time to settle.") true;
-}
+ :if ([ $ScriptLock $ScriptName ] = false) do={
+ :set ExitOK true;
+ :error false;
+ }
-:local DnsServers ({});
-:local DnsFallback ({});
-:local DnsCurrent [ /ip/dns/get servers ];
+ :local SettleTime (5m30s - [ /system/resource/get uptime ]);
+ :if ($SettleTime > 0s) do={
+ $LogPrint info $ScriptName ("System just booted, giving netwatch " . $SettleTime . " to settle.");
+ :set ExitOK true;
+ :error true;
+ }
-:foreach Host in=[ /tool/netwatch/find where comment~"dns" status="up" ] do={
- :local HostVal [ /tool/netwatch/get $Host ];
- :local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
+ :local DnsServers ({});
+ :local DnsFallback ({});
+ :local DnsCurrent [ /ip/dns/get servers ];
- :if ($HostInfo->"disabled" != true) do={
- :if ($HostInfo->"dns" = true) do={
- :set DnsServers ($DnsServers, $HostVal->"host");
- }
- :if ($HostInfo->"dns-fallback" = true) do={
- :set DnsFallback ($DnsFallback, $HostVal->"host");
+ :foreach Host in=[ /tool/netwatch/find where comment~"\\bdns\\b" status="up" ] do={
+ :local HostVal [ /tool/netwatch/get $Host ];
+ :local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
+
+ :if ($HostInfo->"disabled" != true) do={
+ :if ($HostInfo->"dns" = true) do={
+ :set DnsServers ($DnsServers, $HostVal->"host");
+ }
+ :if ($HostInfo->"dns-fallback" = true) do={
+ :set DnsFallback ($DnsFallback, $HostVal->"host");
+ }
}
}
-}
-:if ([ :len $DnsServers ] > 0) do={
- :if ($DnsServers != $DnsCurrent) do={
- $LogPrintExit2 info $0 ("Updating DNS servers: " . [ :tostr $DnsServers ]) false;
- /ip/dns/set servers=$DnsServers;
- /ip/dns/cache/flush;
- }
-} else={
- :if ([ :len $DnsFallback ] > 0) do={
- :if ($DnsFallback != $DnsCurrent) do={
- $LogPrintExit2 info $0 ("Updating DNS servers to fallback: " . \
- [ :tostr $DnsFallback ]) false;
- /ip/dns/set servers=$DnsFallback;
+ :if ([ :len $DnsServers ] > 0) do={
+ :if ($DnsServers != $DnsCurrent) do={
+ $LogPrint info $ScriptName ("Updating DNS servers: " . [ :tostr $DnsServers ]);
+ /ip/dns/set servers=$DnsServers;
/ip/dns/cache/flush;
}
+ } else={
+ :if ([ :len $DnsFallback ] > 0) do={
+ :if ($DnsFallback != $DnsCurrent) do={
+ $LogPrint info $ScriptName ("Updating DNS servers to fallback: " . [ :tostr $DnsFallback ]);
+ /ip/dns/set servers=$DnsFallback;
+ /ip/dns/cache/flush;
+ }
+ }
}
-}
-
-:local DohServer "";
-:local DohCert "";
-:local DohCurrent [ /ip/dns/get use-doh-server ];
-:foreach Host in=[ /tool/netwatch/find where comment~"doh" status="up" ] do={
- :local HostVal [ /tool/netwatch/get $Host ];
- :local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
+ :local DohCurrent [ /ip/dns/get use-doh-server ];
+ :local DohServers ({});
- :if ($HostInfo->"doh" = true && $HostInfo->"disabled" != true && $DohServer = "") do={
- :set DohServer [ $EitherOr ($HostInfo->"doh-url") \
- ("https://" . $HostVal->"host" . "/dns-query") ];
- :set DohCert ($HostInfo->"doh-cert");
+ :if ([ :len $DohCurrent ] > 0 && [ $IsDNSResolving ] = false && [ $IsTimeSync ] = false) do={
+ $LogPrint info $ScriptName ("Time is not sync, disabling DoH: " . $DohCurrent);
+ /ip/dns/set use-doh-server="";
+ :set DohCurrent "";
}
-}
-:if ($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;
+ :foreach Host in=[ /tool/netwatch/find where comment~"\\bdoh\\b" status="up" ] do={
+ :local HostVal [ /tool/netwatch/get $Host ];
+ :local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
+ :local HostName [ /ip/dns/static/find where name address=($HostVal->"host") \
+ (type="A" or type="AAAA") !disabled !dynamic ];
+ :if ([ :len $HostName ] > 0) do={
+ :set HostName [ /ip/dns/static/get ($HostName->0) name ];
+ }
+
+ :if ($HostInfo->"doh" = true && $HostInfo->"disabled" != true) do={
+ :if ([ :len ($HostInfo->"doh-url") ] = 0) do={
+ :set ($HostInfo->"doh-url") ("https://" . [ $EitherOr $HostName ($HostVal->"host") ] . "/dns-query");
+ }
+
+ :if ($DohCurrent = $HostInfo->"doh-url") do={
+ $LogPrint debug $ScriptName ("Current DoH server is still up: " . $DohCurrent);
+ :set ExitOK true;
+ :error true;
}
+
+ :set ($DohServers->[ :len $DohServers ]) $HostInfo;
}
- /ip/dns/set use-doh-server=$DohServer;
- /ip/dns/cache/flush;
}
-} else={
- :if ($DohCurrent != "") do={
- $LogPrintExit2 info $0 ("DoH server (" . $DohCurrent . ") is down, disabling.") false;
+
+ :if ([ :len $DohCurrent ] > 0) do={
+ $LogPrint info $ScriptName ("Current DoH server is down, disabling: " . $DohCurrent);
/ip/dns/set use-doh-server="";
/ip/dns/cache/flush;
}
+
+ :foreach DohServer in=$DohServers do={
+ :if ([ :len ($DohServer->"doh-cert") ] > 0) do={
+ :if ([ $CertificateAvailable ($DohServer->"doh-cert") ] = false) do={
+ $LogPrint warning $ScriptName ("Downloading certificate failed, trying without.");
+ }
+ }
+
+ :local Data false;
+ :do {
+ :set Data ([ /tool/fetch check-certificate=yes-without-crl output=user \
+ http-header-field=({ "accept: application/dns-message" }) \
+ url=(($DohServer->"doh-url") . "?dns=" . [ :convert to=base64 ([ :rndstr length=2 ] . \
+ "\01\00" . "\00\01" . "\00\00" . "\00\00" . "\00\00" . "\09doh-check\05eworm\02de\00" . \
+ "\00\10" . "\00\01") ]) as-value ]->"data");
+ } on-error={
+ $LogPrint warning $ScriptName ("Request to DoH server failed (network or certificate issue): " . \
+ ($DohServer->"doh-url"));
+ }
+
+ :if ($Data != false) do={
+ :if ([ :typeof [ :find $Data "doh-check-OK" ] ] = "num") do={
+ /ip/dns/set use-doh-server=($DohServer->"doh-url") verify-doh-cert=yes;
+ :if ([ /certificate/settings/get crl-use ] = true) do={
+ $LogPrintOnce warning $ScriptName ("Configured to use CRL, that can cause severe issue!");
+ }
+ /ip/dns/cache/flush;
+ $LogPrint info $ScriptName ("Setting DoH server: " . ($DohServer->"doh-url"));
+ :set ExitOK true;
+ :error true;
+ } else={
+ $LogPrint warning $ScriptName ("Received unexpected response from DoH server: " . \
+ ($DohServer->"doh-url"));
+ }
+ }
+ }
+} on-error={
+ :global ExitError; $ExitError $ExitOK [ :jobname ];
}
generated by cgit v1.2.3-70-g09d2 (git 2.49.0) at 2025-05-11 06:15:53 +0000