How should I get the fully qualified domain name of "localhost" in c++ (on ubuntu)?

Question

I've been messing around with getaddrinfo and getnameinfo but the closest I got to useful output was "localhost.localdomain". I'm not sure what to pass in for the "node" or "service" args of getaddrinfo, although I think it's the function I want.

You cannot, with any kind of reliability, convert "localhost" into a fully qualified domain. There might, for example, be several fully qualified domains which use the same IP address, or there might be none. If, in your specific case, you *know* there is a unique fully qualified domain, then just specify it in your app via a config file. In your case, it appears localhost.localdomain IS the fully qualified domain, as configured in /etc/hosts — user229044, Jan 28 '10 at 17:14

score 2 · Accepted Answer · edited May 23 '17 at 12:30

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Actually, Zxaos's answer here is pretty much the answer I was looking for (even though it's for C and mine was for C++, it works in both):

How do I find the current machine's full hostname in C (hostname and domain information)?

So I guess my question was a duplicate...

edited May 23 '17 at 12:30

Community

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answered Jan 28 '10 at 17:44

karenc

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score 0 · Answer 2 · edited Sep 18 '18 at 04:58

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You can try the following command:

#hostname --fqdn

Works well with OpenSuse flavour. Not sure about Ubuntu.

edited Sep 18 '18 at 04:58

James A Mohler

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answered Sep 18 '18 at 04:53

gaurav rai

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How should I get the fully qualified domain name of "localhost" in c++ (on ubuntu)?

2 Answers2