openssh bugs - Jun 2010 - [Bug 1787] New: -g flag has issues with ipv6 (Address already in use)

https://bugzilla.mindrot.org/show_bug.cgi?id=1787

           Summary: -g flag has issues with ipv6 (Address already in use)
           Product: Portable OpenSSH
           Version: 5.3p1
          Platform: amd64
        OS/Version: Linux
            Status: NEW
          Severity: trivial
          Priority: P2
         Component: ssh
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: hnassrat at gmail.com


Using the -g flag, gives an error, e.g.:

hnassrat at HNASSRAT-LNX1 ~> ssh -vgL 9000:localhost:9000 hatem at nassrat
[...]
debug1: Local connections to *:9000 forwarded to remote address
localhost:9000
debug1: Local forwarding listening on 0.0.0.0 port 9000.
debug1: channel 0: new [port listener]
debug1: Local forwarding listening on :: port 9000.
bind: Address already in use

I am not sure if this issue is specific to linux and thus a bug in
linux network config, but when it bound to 0.0.0.0 it listens to all
interfaces then trying to listen to the ipv6 interface causes it to say
bind address already in use. In this case (OpenSSH_5.3p1
Debian-3ubuntu3, OpenSSL 0.9.8k 25 Mar 2009) the error is useless,
however with a machine running OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5
01 Jul 2008 it binds to ipv6 first.

In any case the workaround I used, thanks to ssh being awesome and
having cool features, is to use the command as follows:

hnassrat at HNASSRAT-LNX1 ~> ssh -4gL 9000:localhost:9000 hatem at nassrat

This maybe another side-effect, but although I specified only listen on
ipv4, i would think it will probably listen on all interfaces (thats
probably not an ssh bug though).

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https://bugzilla.mindrot.org/show_bug.cgi?id=1787

--- Comment #1 from Damien Miller <djm at mindrot.org>  ---
Created attachment 1883
  --> https://bugzilla.mindrot.org/attachment.cgi?id=1883
v6only.diff

Please try this patch.

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https://bugzilla.mindrot.org/show_bug.cgi?id=1787

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org

--- Comment #2 from Damien Miller <djm at mindrot.org> 2010-10-12 14:27:56
EST ---
ping - have you had a chance to try the patch I supplied?

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