#!/bin/sh

#
# Select a ssh binary depending on the target host.
# This is necessary in order to use sftp on some
# kerberized remote hosts where the ssh binaries
# must have special patches applied and where these
# patches are either not available for recent ssh
# implementations (forcing one to use an outdated one)
# or where these patched ssh binaries behave badly
# with NAT and LANs (reverse ip mapping lockups).
# So the best solution is to have a flexible setup
# that allows one to use different ssh clients --
# one for each target host if ever necessary...
#
# The format of /etc/ssh-chooser.conf is like:
#
#   .fnal.gov /home/mark/div/local/ssh-krb5/bin/ssh
#
# etc.
#
# The default is to just use 'ssh'. The first entry
# is matched against the tail of the host name, the
# second entry is the ssh binary.
#

CFG="ssh-chooser.conf"
TAILS=""
CFGS=""
[ -r "/etc/$CFG" ] && CFGS="$CFGS /etc/$CFG"
[ -r "$HOME/.$CFG" ] && CFGS="$CFGS $HOME/.$CFG"
TAILS=`awk '{ print $1 }' $CFGS`

#
# I'm not wasting time on finding out how the different
# ssh implementations process their arguments in order
# to find the target host name among all of them. We
# just try to match against each one of them that does
# not start with a '-'.
#

BINARY="ssh-default"

for a in  $* ; do
	[ "x$a" != "x${a#-}" ] && continue
	for t in $TAILS ; do
		[ "x$a" != "x${a%$t}" ] && BINARY=`awk "{ if ( \\$1 == \"$t\" ) { print \\$2 } }" $CFGS`
	done
done

exec "$BINARY" "$@"