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[DNS] Reverse DNS resolution returns - (dash) character #4229
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$ dig +noall +answer -x 87.233.241.210 210.241.233.87.in-addr.arpa. 86366 IN PTR -.That's what DNS actually returns. There is nothing that Node.js could or should do here.
@ChALkeR Thanks for the quick answer.
Is this part of the DNS protocol ? I can't find information anywhere about a possible
-dash character as a return value even after looking through the Node.js and C-Ares source codes.It's technically legal, the RDATA field in PTR records is free-form. Suggest close?
It might be interesting to mention this in the DNS core module documentation if that's the case because otherwise anyone that does not validate the hostnames returned will encounter unnecessary errors further down the pipeline.
Yup, the issue can be closed. Thanks for the information!
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on Dec 4, 2023 - added a commit that references this issue
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on Dec 15, 2023
I encountered a strange behaviour on the
dns.reverse()method. e.g:If you resolve the domain name
www.fagron.comto an IP address:If you now re-use this IPv4 address and do a reverse DNS resolution:
It seems fairly strange that the returned value is a
-dash character (45) since you would expect that:hostnamesargument isundefinedhostnamesargument is an empty array[]Node.js version is:
v4.2.2Operating system version is:
Darwin myhostname.local 14.5.0 Darwin Kernel Version 14.5.0: Wed Jul 29 02:26:53 PDT 2015; root:xnu-2782.40.9~1/RELEASE_X86_64 x86_64