openssh unix dev - Feb 2009 - miss handling of the SIGHUP signal for sshd when sshd is started with a relative path sshd_config file

Hi 

 

I am just porting ssh-5.2 to my HPUX system. 

 

but while I'm doing it, I accidently  found a different handling of the sshd
for the SIGHUP signal when it is started with a "./sshd_config" and
"/sshd_config".

 

The problem is as following:

 

root at sshpa6# uname -a
HP-UX sshpa6 B.11.31 U 9000/800 2404418693 unlimited-user license

root at sshpa6# /opt/ssh/sbin/sshd -f ./sshd_config                  ###
./sshd_config is a relative path
root at sshpa6# ps -ef|grep sshd
    root 12616     1  0 15:51:00 ?         0:00 /opt/ssh/sbin/sshd -f
./sshd_config
    root 12618 17401  0 15:51:03 pts/tb    0:00 grep sshd
root at sshpa6# kill -HUP 12616
root at sshpa6# ps -ef|grep sshd
    root 12620 17401  0 15:51:12 pts/tb    0:00 grep sshd        ### sshd is
killed but not restarted as it should be.

 


So is it a bug or a normal situation?

 

 

-Best Regards

-Sway

 

Thanks.

 

_________________________________________________________________
??????????????????????????????
http://piao.live.com/?form=PANER01

Hello,

?? wrote:
> root at sshpa6# /opt/ssh/sbin/sshd -f ./sshd_config                  ###
./sshd_config is a relative path
> root at sshpa6# ps -ef|grep sshd
>     root 12616     1  0 15:51:00 ?         0:00 /opt/ssh/sbin/sshd -f
./sshd_config
>     root 12618 17401  0 15:51:03 pts/tb    0:00 grep sshd
> root at sshpa6# kill -HUP 12616
> root at sshpa6# ps -ef|grep sshd
>     root 12620 17401  0 15:51:12 pts/tb    0:00 grep sshd        ### sshd
is killed but not restarted as it should be.
> 
> 
> So is it a bug or a normal situation?
Good question. Can you check your log files to try to find more
information about why sshd is not started again?


//Peter

On Feb 25, 2009, at 2:04 AM, ?? wrote:
>
> Hi
>
> I am just porting ssh-5.2 to my HPUX system.
>
>
> but while I'm doing it, I accidently  found a different handling of  
> the sshd for the SIGHUP signal when it is started with a "./ 
> sshd_config" and "/sshd_config".
>
> The problem is as following:
>
> root at sshpa6# uname -a
> HP-UX sshpa6 B.11.31 U 9000/800 2404418693 unlimited-user license
>
> root at sshpa6# /opt/ssh/sbin/sshd -f ./sshd_config                   
> ### ./sshd_config is a relative path
> root at sshpa6# ps -ef|grep sshd
>    root 12616     1  0 15:51:00 ?         0:00 /opt/ssh/sbin/sshd - 
> f ./sshd_config
>    root 12618 17401  0 15:51:03 pts/tb    0:00 grep sshd
> root at sshpa6# kill -HUP 12616
> root at sshpa6# ps -ef|grep sshd
>    root 12620 17401  0 15:51:12 pts/tb    0:00 grep sshd        ###  
> sshd is killed but not restarted as it should be.
>
> So is it a bug or a normal situation?
>
If I had the venture a guess it is because ./xxx is a relative, and  
after a chdir("/") it is no longer the same location when OpenSSH is -
HUP it no longer knows where the configuration file is and thus  
terminates itself.

So yes, I would expect this behavior myself.

So the simply truth is you should always do:  /path/to/sshd -f /path/ 
to/sshd_config

- Ben