Hey guys,

I am cross-posting this to the PHP and the PHP-FPM lists, because both
are applicable in my opinion.

I have got a strange problem with my php-fpm chrooted PHP environment.
PHP is chrooted to /var/www/.

/var/www/etc looks like this:
# ls -al /var/www/etc/
insgesamt 20
drwxr-xr-x 2 root root 4096 9. Sep 20:33 .
drwxr-xr-x 5 root root 4096 9. Sep 20:10 ..
-rw-r--r-- 1 root root 265 9. Sep 20:12 hosts
-rw-r--r-- 1 root root 513 9. Sep 20:23 nsswitch.conf
-rw-r--r-- 1 root root 52 9. Sep 20:11 resolv.conf

I do run the following script:
<?php
echo gethostbyname('www.google.de')."\n";
print_r(dns_get_record('www.google.de', DNS_A))."\n";
?>

Which strangely outputs this:
www.google.de
Array
(
[0] => Array
(
[host] => www.l.google.com
[type] => A
[ip] => 74.125.43.147
[class] => IN
[ttl] => 172
)

[1] => Array
(
[host] => www.l.google.com
[type] => A
[ip] => 74.125.43.99
[class] => IN
[ttl] => 172
)

[2] => ....

I don't understand why the first lookup fails, but the second one succeeds.
Unfortunately thinks like fsockopen() seem to use the same technique as
gethostbyname(), so they don't work either.
Any pointers would be appreciated!

Regards,
Samy

I would check with truss what is php really trying to do - if some file in
chroot is missing you will find it this way, or you will see what function
fail on dns lookup.

2009/9/9 Samuel Vogel <samydelux@gmail.com>

>
> Hey guys,
>
> I am cross-posting this to the PHP and the PHP-FPM lists, because both
> are applicable in my opinion.
>
> I have got a strange problem with my php-fpm chrooted PHP environment.
> PHP is chrooted to /var/www/.
>
> /var/www/etc looks like this:
> # ls -al /var/www/etc/
> insgesamt 20
> drwxr-xr-x 2 root root 4096 9. Sep 20:33 .
> drwxr-xr-x 5 root root 4096 9. Sep 20:10 ..
> -rw-r--r-- 1 root root 265 9. Sep 20:12 hosts
> -rw-r--r-- 1 root root 513 9. Sep 20:23 nsswitch.conf
> -rw-r--r-- 1 root root 52 9. Sep 20:11 resolv.conf
>
> I do run the following script:
> <?php
> echo gethostbyname('www.google.de')."\n";
> print_r(dns_get_record('www.google.de', DNS_A))."\n";
> ?>
>
> Which strangely outputs this:
> www.google.de
> Array
> (
> [0] => Array
> (
> [host] => www.l.google.com
> [type] => A
> [ip] => 74.125.43.147
> [class] => IN
> [ttl] => 172
> )
>
> [1] => Array
> (
> [host] => www.l.google.com
> [type] => A
> [ip] => 74.125.43.99
> [class] => IN
> [ttl] => 172
> )
>
> [2] => ....
>
> I don't understand why the first lookup fails, but the second one succeeds.
> Unfortunately thinks like fsockopen() seem to use the same technique as
> gethostbyname(), so they don't work either.
> Any pointers would be appreciated!
>
> Regards,
> Samy
>

While copying libs in the chroot directory I didn't restart the php
processes, so the new libs weren't seen by the already running processes.
Restarting solved it of course...

Am 09.09.09 23:17, schrieb Marcin Ochab:
> I would check with truss what is php really trying to do - if some
> file in chroot is missing you will find it this way, or you will see
> what function fail on dns lookup.
>
> 2009/9/9 Samuel Vogel <samydelux@gmail.com <mailto:samydelux@gmail.com>>
>
>
> Hey guys,
>
> I am cross-posting this to the PHP and the PHP-FPM lists, because both
> are applicable in my opinion.
>
> I have got a strange problem with my php-fpm chrooted PHP environment.
> PHP is chrooted to /var/www/.
>
> /var/www/etc looks like this:
> # ls -al /var/www/etc/
> insgesamt 20
> drwxr-xr-x 2 root root 4096 9. Sep 20:33 .
> drwxr-xr-x 5 root root 4096 9. Sep 20:10 ..
> -rw-r--r-- 1 root root 265 9. Sep 20:12 hosts
> -rw-r--r-- 1 root root 513 9. Sep 20:23 nsswitch.conf
> -rw-r--r-- 1 root root 52 9. Sep 20:11 resolv.conf
>
> I do run the following script:
> <?php
> echo gethostbyname('www.google.de http://www.google.de')."\n";
> print_r(dns_get_record('www.google.de http://www.google.de',
> DNS_A))."\n";
> ?>
>
> Which strangely outputs this:
> www.google.de http://www.google.de
> Array
> (
> [0] => Array
> (
> [host] => www.l.google.com http://www.l.google.com
> [type] => A
> [ip] => 74.125.43.147
> [class] => IN
> [ttl] => 172
> )
>
> [1] => Array
> (
> [host] => www.l.google.com http://www.l.google.com
> [type] => A
> [ip] => 74.125.43.99
> [class] => IN
> [ttl] => 172
> )
>
> [2] => ....
>
> I don't understand why the first lookup fails, but the second one
> succeeds.
> Unfortunately thinks like fsockopen() seem to use the same
> technique as
> gethostbyname(), so they don't work either.
> Any pointers would be appreciated!
>
> Regards,
> Samy
>
>