This is what the attached script gives me now (Fedora 32, Glibc 2.31):
getaddrinfo host="None" hints.ai_flags=AI_ADDRCONFIG:
::1
127.0.0.1
getaddrinfo host="localhost" hints.ai_flags=AI_ADDRCONFIG:
::1
127.0.0.1
getaddrinfo host="127.0.0.1" hints.ai_flags=AI_ADDRCONFIG:
127.0.0.1
getaddrinfo host="localhost4" hints.ai_flags=AI_ADDRCONFIG:
127.0.0.1
getaddrinfo host="::1" hints.ai_flags=AI_ADDRCONFIG:
::1
getaddrinfo host="localhost6" hints.ai_flags=AI_ADDRCONFIG:
::1
getaddrinfo host="195.47.235.3" hints.ai_flags=AI_ADDRCONFIG:
195.47.235.3
getaddrinfo host="2a02:38::1001" hints.ai_flags=AI_ADDRCONFIG:
2a02:38::1001
getaddrinfo host="info.nix.cz" hints.ai_flags=AI_ADDRCONFIG:
2a02:38::1001
195.47.235.3
getaddrinfo host="www.google.com" hints.ai_flags=AI_ADDRCONFIG:
2a00:1450:400f:809::2004
172.217.21.132
So the output is fine now.
HOWEVER, if I query with family=AF_INET, I still get two results:
[(<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1',
0)),
(<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1',
0))]
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Touch seeded packages, which is subscribed to eglibc in Ubuntu.
https://bugs.launchpad.net/bugs/582585
Title:
getaddrinfo() returns duplicate addresses under AI_ADDRCONFIG
Status in eglibc:
Confirmed
Status in eglibc package in Ubuntu:
Confirmed
Bug description:
Presume I have a computer that has no global IPv6 addresses, but a few
IPv4 addresses.
Applications using getaddrinfo() with hints.ai_flags = AI_ADDRCONFIG
set will properly omit IPv6 addresses, HOWEVER they will return
duplicate IPv4 addresses.
Demonstration code attached.
Without IPv6 addresses:
# show setup
$ grep -w localhost /etc/hosts
127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
$ ip a s | grep inet
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
inet 192.168.0.4/24 brd 192.168.0.255 scope global eth0
inet6 fe80::226:XXXX:XXXX:XXXX/64 scope link # masked for privacy
# compile test case
$ gcc -Wall -Wextra -pedantic -O -o libcbug-demo libcbug-demo.c
# run test case
$ ./libcbug-demo localhost echo
Address 1: 127.0.0.1
Address 2: 127.0.0.1
(127.0.0.1 should be listed only once, Solaris 10 for instance
achieves that)
Now configure a fake IPv6 address (don't do this on hosts with real
IPv6 connectivity, it suffices to use your real IPv6 address) and re-
run the application:
$ ip a a 2001::2001 dev eth0 # set up IPv6
$ ./libcbug-demo localhost echo
Address 1: ::1
Address 2: 127.0.0.1
$ ip a d 2001::2001 dev eth0 # deconfigure bogus address
(This is fine)
Practical consequence: excessive connection retries by applications
that possibly take a long time.
This isn't Ubuntu specific.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: libc6 2.11.1-0ubuntu7
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Wed May 19 01:13:51 2010
ProcEnviron:
PATH=(custom, no user)
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: eglibc
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