openssh bugs - Dec 2009 - [Bug 1685] New: ssh attempts v4 connection w/v6 BindAddress setting in ssh config

https://bugzilla.mindrot.org/show_bug.cgi?id=1685

           Summary: ssh attempts v4 connection w/v6 BindAddress setting in
                    ssh config
           Product: Portable OpenSSH
           Version: 5.3p1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Miscellaneous
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: lippard-mindrot at discord.org


The following error occurs (from sshconnect) in my mixed IPv6/v4
environment when ssh'ing from one machine to another (IP addresses have
been obfuscated)                                   

ssh -vv openapple      
OpenSSH_5.3, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /home/lippard/.ssh/config
debug1: Applying options for openapple
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to openapple [10.22.5.50] port 2222.
getaddrinfo: 2001:470:d:19a:d0::100: no address associated with name
debug1: Connecting to openapple [2001:470:d:19a:d5::50] port 2222.

The getaddrinfo error occurs because I have an ssh config which sets
the BindAddress to 2001:470:d:19a:d0::100 when I ssh to host
openapple.  openapple has a DNS A record of 10.22.5.50 and an AAAA
record of 2001:470:d:19a:d5::50 (both of which have appropriate rDNS).  

Looks like ssh is failing to recognize that my BindAddress is an IPv6
address rather than a DNS name, despite the fact that ":" is not a
valid character in DNS names.  Given my BindAddress setting, it should
not be attempting an IPv4 connection in the first place.

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https://bugzilla.mindrot.org/show_bug.cgi?id=1685

Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dtucker at zip.com.au

--- Comment #1 from Darren Tucker <dtucker at zip.com.au> 2010-01-12
19:12:41 EST ---
ssh is trying to resolve your bindaddress (which could be a hostname)
in the addressfamily of each of the addresses returned by your
resolver.  This obviously doesn't work for IPv4, but ssh doesn't know
this until the getaddrinfo fails, generating the error.

Since only want IPv6 you should also set "AddressFamily inet6" where
you set your IPv6 BindAddress.

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