Date: Sat, 25 Apr 2009 21:03:16 +0900 From: Kouichiro Iwao <meta@club.kyutech.ac.jp> To: Ruben de Groot <mail25@bzerk.org> Cc: questions@freebsd.org Subject: Re: how to deceive programs as if I were a local user? Message-ID: <20090425120316.GB31588@club.kyutech.ac.jp> In-Reply-To: <20090425092222.GA75517@ei.bzerk.org> References: <20090423073229.GA87987@club.kyutech.ac.jp> <20090423091027.GA47290@ei.bzerk.org> <20090423181711.GH40655@hal.rescomp.berkeley.edu> <20090425083416.GA31588@club.kyutech.ac.jp> <20090425092222.GA75517@ei.bzerk.org>
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On Sat, Apr 25, 2009 at 11:22:22AM +0200, Ruben de Groot wrote:
> > Configuring nsswitch.conf in linux emulation environment,
> > the program worked properly. I did't know I had to set
> > /compat/linux/etc/nsswitch.conf for linux binary compatibility.
>
> That's interesting. Was there a /compat/linux/etc/nsswitch.conf before?
> I think that if it's not there, the linux emulation layer should take
> the system's /etc/nsswitch.conf as default. But I might be wrong(TM).
What does TM mean? :-(
Yes. I didn't make /compat/linux/etc/nsswitch.conf but just modified
the file that had already existed. I also configured
/compat/linux/etc/yp.conf and /compat/linux/etc/sysconfig/network to
use NIS.
I examined the linux emulator takes /compat/linux/etc/nsswitch.conf.
/etc/nsswitch.conf:
$ grep -v -e ^$ -e ^# /etc/nsswitch.conf
group: compat
group_compat: nis
hosts: files dns
networks: files
passwd: compat
passwd_compat: nis
shells: files
services: compat
services_compat: nis
protocols: files
rpc: files
/compat/linux/etc/nsswitch.conf:
$ grep -v -e ^$ -e ^# /compat/linux/etc/nsswitch.conf
passwd: files nis
shadow: files nis
group: files nis
hosts: files dns
bootparams: nisplus [NOTFOUND=return] files
ethers: files
netmasks: files
networks: files
protocols: files
rpc: files
services: files
netgroup: nisplus
publickey: nisplus
automount: files nisplus
aliases: files nisplus
And the sample program "sample.c":
#include<sys/types.h>
#include<stdio.h>
#include<pwd.h>
int main(){
struct passwd *pw;
pw = getpwuid(getuid());
if(pw){
printf("success\n");
} else {
printf("error\n");
}
}
I compiled the sample for both freebsd and linux binaries.
With the setting above I ran each binary, both binaries resulted success.
But when "nis" is not written in linux emulation environment's nsswitch.conf,
the linux binary results error.
--
Iwao, Koichiro <meta@club.kyutech.ac.jp>
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