[Bug 343] New: Only try connect to first address when creating tunnel

[bugzilla-daemon at mindrot.org]

http://bugzilla.mindrot.org/show_bug.cgi?id=343

           Summary: Only try connect to first address when creating tunnel
           Product: Portable OpenSSH
           Version: -current
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: sshd
        AssignedTo: openssh-unix-dev at mindrot.org
        ReportedBy: stig at venaas.com


In connect_to() in channels.c there is a loop trying to connect to each
address returned by getaddrinfo() until connect() is successful or
EINPROGRESS is returned. The socket is non-blocking so unless something
immediately fails, EINPROGRESS is returned and we happily leave the loop.
Then when we later attempt to write to the socket, we realize that we're
not connected. No route to host, connection refused etc. I would like
sshd to try another address if possible when this happens. Or in other
words, loop through all candidates until we are absolutely positive we
have established a connection. I think this can be done by selecting
the socket for writing without actually writing anything. I'm happy to
elaborate why this is a real life problem if necessary.



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