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|
#!/bin/sh
# mrgrctrnl
# configurable ssh tunneler
# by Case Duckworth <acdw@acdw.net>
# version 0.1
# LICENSE: MIT
usage() {
cat <<-END
mrgrctrnl: make magic ssh tunnels
usage: mrgrctrnl [-h] [-c CONF] [-d] [-k]
-h show this help
-c CONF use config file CONF.
. default: \$XDG_CONFIG_HOME/mrgrctrnl/config
-d do a dry run: don't actually tunnel
-k kill all processes and exit
END
exit "${1:-0}"
}
die() {
[ "$#" -eq 0 ] && exit 1
case "$1" in
0-9*)
ec="$1"
shift
;;
*) ec=1 ;;
esac
printf '!!%s: %s\n' "mrgrctrnl" "$*"
exit "$ec"
}
demolish_tunnels() {
printf '%s...' "Demolishing tunnels"
if [ -f "$pidf" ]; then
while read -r pid; do
[ -z "$pid" ] && continue
kill "$pid" 2>/dev/null
done <"$pidf"
rm "$pidf"
else
pkill -x ssh
fi
printf '%s.\n' "Done"
}
config="${XDG_CONFIG_HOME:=$HOME/.config}/mrgrctrnl/config"
pidf=/tmp/mrgrctrnl.pid
dry_run=false
while getopts hc:dkr opt; do
case "$opt" in
h) usage ;;
c) config="$OPTARG" ;;
d) dry_run=true ;;
k)
demolish_tunnels
pkill -x mrgrctrnl
exit
;;
r)
demolish_tunnels
exec mrgrctrnl
exit
;;
\?) usage 2 ;;
*) usage 2 ;;
esac
done
shift "$((OPTIND - 1))"
[ -f "$config" ] || die "Need a config! Edit $config"
if [ -e "$pidf" ] && ! "$dry_run"; then
demolish_tunnels
fi
awk '{sub(/#.*$/,"");print}' "$config" |
while read -r machine user local remote key rest; do
if [ -z "$machine" ] || [ -z "$user" ] ||
[ -z "$local" ] || [ -z "$remote" ]; then
continue
fi
set -- -N "$user@$machine" -L "$local:$remote"
[ -n "$key" ] && set -- "$@" -i "$key"
#shellcheck disable=2086
[ -n "$rest" ] && set -- "$@" $rest
echo ssh "$@"
touch "$pidf"
"$dry_run" || {
while [ -f "$pidf" ]; do
ssh "$@" || break
echo "$!" >>"$pidf"
done &
}
done
wait
|
