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netwatch-dns: move code into function
This commit is contained in:
Christian Hesse
parent
400516295e
commit
458fd1fdcd
1 changed files with 98 additions and 93 deletions
191
netwatch-dns.rsc
191
netwatch-dns.rsc
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@ -8,116 +8,121 @@
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# monitor and manage dns/doh with netwatch
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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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# https://git.eworm.de/cgit/routeros-scripts/about/doc/netwatch-dns.md
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:local 0 [ :jobname ];
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:global GlobalFunctionsReady;
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:global GlobalFunctionsReady;
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:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
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:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
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:global CertificateAvailable;
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:local Main do={
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:global EitherOr;
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:local ScriptName [ :tostr $1 ];
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:global LogPrintExit2;
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:global ParseKeyValueStore;
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:global ScriptLock;
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$ScriptLock $0;
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:global CertificateAvailable;
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:global EitherOr;
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:global LogPrintExit2;
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:global ParseKeyValueStore;
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:global ScriptLock;
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:local SettleTime (5m30s - [ /system/resource/get uptime ]);
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$ScriptLock $ScriptName;
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:if ($SettleTime > 0s) do={
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$LogPrintExit2 info $0 ("System just booted, giving netwatch " . $SettleTime . " to settle.") true;
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}
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:local DnsServers ({});
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:local SettleTime (5m30s - [ /system/resource/get uptime ]);
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:local DnsFallback ({});
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:if ($SettleTime > 0s) do={
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:local DnsCurrent [ /ip/dns/get servers ];
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$LogPrintExit2 info $ScriptName ("System just booted, giving netwatch " . $SettleTime . " to settle.") true;
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}
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:foreach Host in=[ /tool/netwatch/find where comment~"\\bdns\\b" status="up" ] do={
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:local DnsServers ({});
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:local HostVal [ /tool/netwatch/get $Host ];
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:local DnsFallback ({});
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:local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
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:local DnsCurrent [ /ip/dns/get servers ];
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:if ($HostInfo->"disabled" != true) do={
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:foreach Host in=[ /tool/netwatch/find where comment~"\\bdns\\b" status="up" ] do={
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:if ($HostInfo->"dns" = true) do={
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:local HostVal [ /tool/netwatch/get $Host ];
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:set DnsServers ($DnsServers, $HostVal->"host");
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:local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
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}
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:if ($HostInfo->"dns-fallback" = true) do={
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:if ($HostInfo->"disabled" != true) do={
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:set DnsFallback ($DnsFallback, $HostVal->"host");
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:if ($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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}
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}
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}
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:if ([ :len $DnsServers ] > 0) do={
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:if ([ :len $DnsServers ] > 0) do={
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:if ($DnsServers != $DnsCurrent) do={
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:if ($DnsServers != $DnsCurrent) do={
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$LogPrintExit2 info $0 ("Updating DNS servers: " . [ :tostr $DnsServers ]) false;
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$LogPrintExit2 info $ScriptName ("Updating DNS servers: " . [ :tostr $DnsServers ]) false;
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/ip/dns/set servers=$DnsServers;
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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 $ScriptName ("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 DohCurrent [ /ip/dns/get use-doh-server ];
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:local DohServers ({});
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:foreach Host in=[ /tool/netwatch/find where comment~"\\bdoh\\b" status="up" ] do={
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:local HostVal [ /tool/netwatch/get $Host ];
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:local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
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:local HostName [ /ip/dns/static/find where name address=($HostVal->"host") \
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(!type or type="A" or type="AAAA") !disabled !dynamic ];
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:if ([ :len $HostName ] > 0) do={
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:set HostName [ /ip/dns/static/get ($HostName->0) name ];
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}
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:if ($HostInfo->"doh" = true && $HostInfo->"disabled" != true) do={
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:if ([ :len ($HostInfo->"doh-url") ] = 0) do={
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:set ($HostInfo->"doh-url") ("https://" . [ $EitherOr $HostName ($HostVal->"host") ] . "/dns-query");
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}
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:if ($DohCurrent = $HostInfo->"doh-url") do={
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$LogPrintExit2 debug $ScriptName ("Current DoH server is still up: " . $DohCurrent) true;
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}
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:set ($DohServers->[ :len $DohServers ]) $HostInfo;
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}
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}
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:if ([ :len $DohCurrent ] > 0) do={
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$LogPrintExit2 info $ScriptName ("Current DoH server is down, disabling: " . $DohCurrent) false;
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/ip/dns/set use-doh-server="";
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/ip/dns/cache/flush;
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/ip/dns/cache/flush;
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}
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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 DohCurrent [ /ip/dns/get use-doh-server ];
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:foreach DohServer in=$DohServers do={
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:local DohServers ({});
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:if ([ :len ($DohServer->"doh-cert") ] > 0) do={
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:if ([ $CertificateAvailable ($DohServer->"doh-cert") ] = false) do={
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:foreach Host in=[ /tool/netwatch/find where comment~"\\bdoh\\b" status="up" ] do={
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$LogPrintExit2 warning $ScriptName ("Downloading certificate failed, trying without.") false;
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:local HostVal [ /tool/netwatch/get $Host ];
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}
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:local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
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:local HostName [ /ip/dns/static/find where name address=($HostVal->"host") \
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(!type or type="A" or type="AAAA") !disabled !dynamic ];
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:if ([ :len $HostName ] > 0) do={
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:set HostName [ /ip/dns/static/get ($HostName->0) name ];
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}
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:if ($HostInfo->"doh" = true && $HostInfo->"disabled" != true) do={
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:if ([ :len ($HostInfo->"doh-url") ] = 0) do={
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:set ($HostInfo->"doh-url") ("https://" . [ $EitherOr $HostName ($HostVal->"host") ] . "/dns-query");
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}
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}
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:if ($DohCurrent = $HostInfo->"doh-url") do={
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:local Data false;
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$LogPrintExit2 debug $0 ("Current DoH server is still up: " . $DohCurrent) true;
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:do {
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}
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:set Data ([ /tool/fetch check-certificate=yes-without-crl output=user \
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http-header-field=({ "accept: application/dns-message" }) \
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:set ($DohServers->[ :len $DohServers ]) $HostInfo;
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url=(($DohServer->"doh-url") . "?dns=" . [ :convert to=base64 ([ :rndstr length=2 ] . \
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}
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"\01\00" . "\00\01" . "\00\00" . "\00\00" . "\00\00" . "\09doh-check\05eworm\02de\00" . \
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}
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"\00\10" . "\00\01") ]) as-value ]->"data");
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} on-error={
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:if ([ :len $DohCurrent ] > 0) do={
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$LogPrintExit2 warning $ScriptName ("Request to DoH server failed (network or certificate issue): " . \
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$LogPrintExit2 info $0 ("Current DoH server is down, disabling: " . $DohCurrent) false;
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/ip/dns/set use-doh-server="";
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/ip/dns/cache/flush;
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}
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:foreach DohServer in=$DohServers do={
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:if ([ :len ($DohServer->"doh-cert") ] > 0) do={
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:if ([ $CertificateAvailable ($DohServer->"doh-cert") ] = false) do={
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$LogPrintExit2 warning $0 ("Downloading certificate failed, trying without.") false;
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}
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}
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:local Data false;
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:do {
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:set Data ([ /tool/fetch check-certificate=yes-without-crl output=user \
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http-header-field=({ "accept: application/dns-message" }) \
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url=(($DohServer->"doh-url") . "?dns=" . [ :convert to=base64 ([ :rndstr length=2 ] . \
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"\01\00" . "\00\01" . "\00\00" . "\00\00" . "\00\00" . "\09doh-check\05eworm\02de\00" . \
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"\00\10" . "\00\01") ]) as-value ]->"data");
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} on-error={
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$LogPrintExit2 warning $0 ("Request to DoH server failed (network or certificate issue): " . \
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($DohServer->"doh-url")) false;
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}
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:if ($Data != false) do={
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:if ([ :typeof [ :find $Data "doh-check-OK" ] ] = "num") do={
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/ip/dns/set use-doh-server=($DohServer->"doh-url") verify-doh-cert=yes;
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/ip/dns/cache/flush;
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$LogPrintExit2 info $0 ("Setting DoH server: " . ($DohServer->"doh-url")) true;
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} else={
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$LogPrintExit2 warning $0 ("Received unexpected response from DoH server: " . \
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($DohServer->"doh-url")) false;
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($DohServer->"doh-url")) false;
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}
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}
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:if ($Data != false) do={
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:if ([ :typeof [ :find $Data "doh-check-OK" ] ] = "num") do={
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/ip/dns/set use-doh-server=($DohServer->"doh-url") verify-doh-cert=yes;
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/ip/dns/cache/flush;
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$LogPrintExit2 info $ScriptName ("Setting DoH server: " . ($DohServer->"doh-url")) true;
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} else={
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$LogPrintExit2 warning $ScriptName ("Received unexpected response from DoH server: " . \
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($DohServer->"doh-url")) false;
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}
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}
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}
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}
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}
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}
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$Main [ :jobname ];
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