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| klacke at bluetail.com |
 Posted: Fri Jun 06, 2003 11:09 am |
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Guest
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Howdy,
The code in inet_config.erl is not quite right.
On linux, the code in the inet_config:init/0
reads /etc/hosts.conf (only)
The glibc resolver reads both the /etc/host.conf aswell
as /etc/nsswitch.conf
A very old system
[root_at_rall /root]# cat /etc/redhat-release
Red Hat Linux release 6.2 (Zoot)
[root_at_rall /root]# strace ping -c 1 www.erlang.org 2>&1 | grep '/etc/.*.conf'
open("/etc/resolv.conf", O_RDONLY) = 4
open("/etc/nsswitch.conf", O_RDONLY) = 4
read(4, "#
# /etc/nsswitch.conf
#
# An ex"..., 4096) = 1767
open("/etc/host.conf", O_RDONLY) = 4
Slightly newer ....
# cat /etc/redhat-release
Red Hat Linux release 7.3 (Valhalla)
# strace ping -c 1 www.erlang.org 2>&1 | grep '/etc/.*.conf'
open("/etc/resolv.conf", O_RDONLY) = 3
open("/etc/nsswitch.conf", O_RDONLY) = 3
read(3, "#
# /etc/nsswitch.conf
#
# An ex"..., 4096) = 1682
open("/etc/host.conf", O_RDONLY) = 3
And then to the boring part:
tita root # uname -a
Linux tita 2.4.20-gentoo-r5-1 #1 SMP Wed Jun 4 16:51:01 CEST 2003 i686 Intel(R) Pentium(R) 4 CPU 2.20GHz GenuineIntel GNU/Linux
tita root # strace ping -c 1 www.erlang.org 2>&1 | grep '/etc/.*.conf'
open("/etc/nsswitch.conf", O_RDONLY) = 3
read(3, "# /etc/nsswitch.conf:
# $Header:"..., 4096) = 498
open("/etc/resolv.conf", O_RDONLY) = 4
open("/etc/host.conf", O_RDONLY) = -1 ENOENT (No such file or directory)
Gentoo doesn't have the /etc/host.conf file.
This does indeed make sence, having two _different_ files
controling the behaviour of the resolver is broken.
The erlang code _only_ reads the /etc/host.conf file, in order to
a) work on gentoo
b) be more glibc like
We should at least also read the /etc/nsswitch.conf file.
Preferable we should first read /etc/nsswitch.conf and then
if that fails read /etc/host.conf
The /etc/hosts.conf file is an old BSDism and I think that
very few tools (except OTP then  works with that file.
Here's a possible patch, reading /etc/hosts.conf first and then
/etc/nsswitch.conf
But as I wrote, even better would be to read nsswitch before hosts.
People are probably more accustomed to changing the nsswitch
file than the host file.
Enjoy.
/klacke
--
Claes Wikstrom -- Caps lock is nowhere and
Alteon WebSystems -- everything is under control
http://www.bluetail.com/~klacke
cellphone: +46 70 2097763
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