Created attachment 1612 [details]
Allow get_local_name() to handle a socket or pipe.

If hostbased authentication is enabled and a proxy command is used to 
connect to the server, the following warning messages typically
appear:

cannot get sockname for fd
ssh_keysign: no reply
key_sign failed

This is due to the assumption that the file descriptor passed to 
get_local_name() corresponds to a socket, which is not the case when a
proxy command is used.

The attached patch modifies get_local_name() sot that it falls back to
using gethostname() if get_socket_address() fails. As a result, some
redundant code in sshconnect2.c is removed. A typo is sshconnect2.c is
also fixed. ('no installed' vs 'not installed')