* getent hosts address family
@ 2021-04-22 20:53 Philip Rowlands
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From: Philip Rowlands @ 2021-04-22 20:53 UTC (permalink / raw
To: Michael Kerrisk, Alejandro Colomar, linux-man
man1/getent.1 currently includes:
"""
When one or more key arguments are provided, pass each key to gethostbyaddr(3) or gethostbyname2(3), depending on whether a call to inet_pton(3) indicates that the key is an IPv6 or IPv4 address or not, and display the result.
"""
Please append the following clarification:
"""
For symbolic hostnames, getent hosts always tries an AF_INET6 lookup first, even when the system is not otherwise configured to use IPv6.
"""
The reason is to explain to the user why AAAA DNS queries appear as a result of running "getent hosts example.com" on an IPv4-only system. The code is here if you'd like to confirm:
https://sourceware.org/git/?p=glibc.git;a=blob;f=nss/getent.c#l294
Thanks,
Phil
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2021-04-22 20:53 getent hosts address family Philip Rowlands
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