Dimitry Andric wrote:
On 2009-05-20 12:19, Eygene Ryabinkin wrote:
You seem to mix two things: binding to the port and the output from rc.d
'status' command. Binding to the port is done by SSH by the bind(2)
system call and if something is already listening on the given address,
the socket won't be bound, so SSH daemon terminates.
I think what might be confusing, is the fact that sshd dies due to
bind() failing, and it should; but you will only see this in the syslog,
NOT on the command line.
E.g. the /etc/rc.d/sshd script will NOT give an error, because the
/usr/bin/sshd it calls will fork, and as soon as the fork is okay, the
original instance with exit with 0. The forked instance is what will
die on bind(), so you will not see any failures from it.
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Does the child really die? I did a little test:
# /etc/rc.d/sshd status
sshd is not running.
# nc -l 22 >/tmp/ssh_test &
[1] 1733
# /etc/rc.d/sshd start
Starting sshd.
# /etc/rc.d/sshd status
sshd is running as pid 1740.
# ssh someu...@localhost // This didn't timeout
or anything, just didn't give any output. I killed it after a couple of
minutes.
^C
[1]+ Done nc -l 22 > /tmp/ssh_test
# ssh someu...@localhost
The authenticity of host 'localhost (::1)' can't be established.
DSA key fingerprint is 9f:fa:ee:f5:39:c5:de:c4:8f:b9:c5:43:d8:9d:85:23.
Are you sure you want to continue connecting (yes/no)? ^C
# uname -a
FreeBSD asator 7.0-RELEASE-p2 FreeBSD 7.0-RELEASE-p2 #0: Thu Mar 5
03:16:15 CET 2009 r...@asator:/usr/obj/usr/src/sys/A_KERNEL i386
As you can see, the first execution of ssh connects to nc (which
terminated when I killed the ssh client). And the second execution it
gets through to sshd (thus, sshd never failed at it's startup).
I don't know if this is the expected behavior, or if it has changed on
-CURRENT.
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