linux - Force getaddrinfo to use IPv4 - Unix & Linux Stack

Linux command line utility to resolve host names using Or a getaddrinfo() wrapper like: python -c 'import socket;print socket.getaddrinfo("www.google.com","http")[0][4][0]' Note that getaddrinfo will return all instances as a list. The last part of the command selects only the first tuple. This can also return IPv6 addresses. linux - getaddrinfo: command not found - Server Fault getaddrinfo is a library function in the standard C library, not a command line tool. So trying to execute it is not quite the right path to a solution. You can call getaddrinfo from a python shell if you want:

getaddrinfo_a(3) - Linux man page

I've change line in /etc/nsswitch.conf: From: hosts: files dns myhostname To: hosts: files dns And then result is instant: time python -c 'import socket; print socket.getaddrinfo("'`hostname -f`'", None, socket.AF_INET6)' hostname: Name or service not known Traceback (most recent call last): File "", line 1, in socket.gaierror: [Errno -2] Name or service not known real 0m0 linux - GNU C Library getaddrinfo() Flaw - Information As you probably already know, this Tuesday a potentially catastrophic flaw has been identified on glibc function called getaddrinfo(), which performs domain name …

$ ssh hostname reverse mapping checking getaddrinfo for client.example.com [10.0.0.1] failed - POSSIBLE BREAK-IN ATTEMPT! username@hostname password: Resolution There are several ways to resolve this issue:

May 12, 2020 getaddrinfo.c source code [glibc/sysdeps/posix/getaddrinfo Browse the source code of glibc/sysdeps/posix/getaddrinfo.c. 1 /* Host and service name lookups using Name Service Switch modules. 2: Copyright (C) 1996-2019 Free