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gutmensch / docker-dmarc-report

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host name reverse lookup isn't working #30

Closed k3it closed 1 year ago

k3it commented 1 year ago

The web reports have IP addresses in the Host Name column despite

$default_hostlookup = 1; # 1=on 0=off (on is old behaviour )

setting in /var/www/viewer/dmarcts-report-viewer-config.php

Any advice on how to enable name resolution?

image

gutmensch commented 1 year ago

Hey @k3it , hm strange. It works for me as expected (see screenshots). The php script seems to call the standard C library function gethostbyaddr here and the address in your report has a PTR, so maybe try for debugging

$ docker exec -ti dmarc-report bash
# apk add -U bind-tools
# host 192.40.173.187
187.173.40.192.in-addr.arpa domain name pointer mailer187.gate173.rs.smtp.com.

It might be that your docker engine has specific DNS settings, which would cause this behaviour.

hostname_lookup2 hostname_lookup1
k3it commented 1 year ago

@gutmensch you are right, the reverse lookups are not working with the docker internal resolver pointing to 127.0.0.11, while the forward lookups are fine. this is a container running in WSL2 ubuntu. any new container has the same problem, definitely unrelated to anything in your code. Thanks for your help!