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netwatch-dns: check with a HTTP/2 request

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We need RouterOS 7.24 for this to catch runtime errors for bad
command parameters.

Actually this would work with RouterOS 7.23 on architectures that
support http-version=http2 ...
This commit is contained in:
Christian Hesse 2026-07-15 16:38:07 +02:00
parent 8c6707befd
commit 5525132bc4
2 changed files with 15 additions and 6 deletions
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2
doc/netwatch-dns.md
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@ -4,7 +4,7 @@ Manage DNS and DoH servers from netwatch
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19
netwatch-dns.rsc
View file

@ -3,7 +3,7 @@
# Copyright (c) 2022-2026 Christian Hesse <mail@eworm.de>
# https://rsc.eworm.de/COPYING.md
#
# requires RouterOS, version=7.22
# requires RouterOS, version=7.24rc1
# requires device-mode, fetch
#
# monitor and manage dns/doh with netwatch
@ -113,11 +113,20 @@
:local I 1;
:retry {
:set I ($I ^ 1);
:set Data ([ /tool/fetch check-certificate=yes-without-crl output=user \
http-header-field=({ "accept: application/dns-message" }) \
url=(($DohServer->"doh-url") . "?dns=" . [ :convert to=base64 ([ :rndstr length=2 ] . \
:local Url (($DohServer->"doh-url") . "?dns=" . [ :convert to=base64 ([ :rndstr length=2 ] . \
"\01\00" . "\00\01" . "\00\00" . "\00\00" . "\00\00" . "\09doh-check\05eworm" . \
({ "\02de"; "\03net" }->$I) . "\00" . "\00\10" . "\00\01") ]) as-value ]->"data");
({ "\02de"; "\03net" }->$I) . "\00" . "\00\10" . "\00\01") ]);
:onerror Err {
:set Data ([ /tool/fetch check-certificate=yes-without-crl output=user http-version=http2 \
http-header-field=({ "accept: application/dns-message" }) url=$Url as-value ]->"data");
} do={
:if ($Err ~ "^bad parameter http-version") do={
:set Data ([ /tool/fetch check-certificate=yes-without-crl output=user \
http-header-field=({ "accept: application/dns-message" }) url=$Url as-value ]->"data");
} else={
:error $Err;
}
}
} delay=500ms max=6;
} do={
$LogPrint warning $ScriptName ("Request to DoH server " . ($DohServer->"doh-url") . \