#!/bin/sh

set -e

. $(dirname $(readlink -f "$0"))/libll.sh

usage()
{
    local me="$(basename $0)"

    cat <<EOF
usage: $me [-A] <command> [<args>]

Wrap various existing network facilities such that an interface name
may be supplied in places where a hostname is otherwise expected.

  Options:

    -A
      For commands requiring authentication, use password
      authentication with username "admin" and password "admin".

  Commands:

    peer <iface>
      Return the address of the first IPv6 neighbor to respond on
      <iface>'s local LAN.

    ping <iface>
      Send ping to all-hosts group, with link-local scope, on <iface>,
      suppressing loopbacked packets.

    ssh <iface> [<ssh-arguments>]
      ssh(1) to the neighboring host on <iface>.

    scp <src> <dst>
      scp(1) from <src> to <dst>, but any host specified in either
      <src> or <dst> is assumed to be an interface name, which is
      expanded to a neighboring host on that interface.

    ${0} help
      Display this message.

  Examples:

    Start interactive ssh(1) session to the neighbor to eth0
      $me ssh eth0

    Copy /etc/hostname from the neighbor to eth0, using admin/admin
      $me -A scp eth0:/etc/hostname /tmp/hostname

EOF
}

while getopts "A" opt; do
    case ${opt} in
	A)
	    LLSSH_USER=admin
	    LLSSH_PASS=admin
	    ;;
    esac
done
shift $((OPTIND - 1))

if [ $# -lt 1 ]; then
    usage && exit 1
fi

cmd="$1"
shift

case "$cmd" in
    help)
	usage && exit 0
	;;
    peer)
	llpeer "$@"
	;;
    ping)
	llping "$@"
	;;
    scp)
	llscp "$@"
	;;
    ssh)
	llssh "$@"
	;;
    *)
	echo "Unknown command \"$cmd\"" >2
	exit 1
	;;
esac