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#!/bin/sh
# mrgrctrnl: configurable ssh tunneler
# Author: Case Duckworth <acdw@acdw.net>
# Version: 0.3.1
# License: MIT
PRGN="${0##*/}"
# entry point
main() {
# flags
_RUN=true
_LOG=true
_USE_CONFIG=true
_RESTART=false
# options
__CONFIG="${XDG_CONFIG_HOME:-$HOME/.config}/$PRGN/config"
__PIDF="/tmp/$PRGN.pid"
__CMDF="/tmp/$PRGN.cmd"
__SSH="$(command -v autossh || command -v ssh)"
__SSH_ARGS="-nT -N \"\$user@\$machine\" -L \"\$local:\$remote\""
# parse options
while getopts hkrnqSAc:s: OPT; do
case "$OPT" in
h)
usage
exit 0
;;
k)
untunnel
pkill -x "$PRGN"
exit "$?"
;;
r) _RESTART=true ;;
n) _RUN=false ;;
q) _LOG=false ;;
S) __SSH='ssh' ;;
A) __SSH='autossh' ;;
c) __CONFIG="$OPTARG" ;;
s)
__SSH_ARGS="$OPTARG"
_USE_CONFIG=false
;;
*) exit 4 ;;
esac
done
shift $((OPTIND - 1))
# save command invocation (for -r)
if $_RESTART; then
untunnel
exec "$PRGN" $(cat "$__CMDF")
else
printf '%s\n' "$*" >"$__CMDF"
fi
# make sure ssh is installed
if ! command -v "$__SSH" >/dev/null; then
log "Not installed: $__SSH"
exit 2
fi
# make sure the config is readable
if $_USE_CONFIG && [ ! -r "$__CONFIG" ]; then
log "Cannot find config file $__CONFIG; aborting."
exit 3
fi
# load the config
if $_USE_CONFIG; then
awk '{sub(/#.*$/,"");print}' "$__CONFIG" |
while read -r machine user local remote key rest; do
if [ -z "$machine" ] ||
[ -z "$user" ] ||
[ -z "$local" ] ||
[ -z "$remote" ]; then
continue
fi
case "$local" in
:*) local="localhost$local" ;;
esac
case "$remote" in
:*) remote="localhost$remote" ;;
esac
# shellcheck disable=2030
if [ -n "$key" ]; then
__SSH_ARGS="$__SSH_ARGS -i \"$key\""
fi
if [ -n "$rest" ]; then
__SSH_ARGS="$__SSH_ARGS $rest"
fi
eval "tunnel_${__SSH##*/} $__SSH_ARGS" &
done
else
#shellcheck disable=2031
eval "tunnel_${__SSH##*/} $__SSH_ARGS" &
fi
wait
}
usage() {
cat <<END
$PRGN: make magic ssh tunnels
usage: $PRGN [-h] [-k] [-r]
$PRGN [-n] [-q] [-S|-A] [-c FILE | -s ARGS]
options:
-h show this help
-k demolish all tunnels and exit
-r demolish all tunnels and restart
-n dry run: just print what would happen
-q quiet: don't print anything
-S force use of 'ssh'
-A force use of 'autossh'
default: use 'autossh' if installed, otherwise 'ssh'
-c FILE load FILE as config file
default: \$XDG_CONFIG_HOME/$PRGN/config
-s ARGS run CMD with ARGS, do not read config file
default: '-N USER@MACHINE -L LOCAL:REMOTE'
(populated from config file)
config example:
# a hash mark comments to the end of the line
# if either 'local' or 'remote' begin with a colon,
# they'll be prefixed with 'localhost'
# machine user local remote key other
example.com bill :1299 :6667 # key and other are optional
END
}
tunnel_ssh() {
set -- ssh "$@"
log "$@"
$_RUN || return
touch "$__PIDF"
while [ -e "$__PIDF" ]; do # quit if the pid file is removed
# make sure we haven't tunneled this connection already
if grep -q -e "$*" "$__PIDF"; then
sleep 3
continue
fi
# try to start ssh tunnel
if "$@" & then
printf '%s\t%s\n' "$!" "$*" >>"$__PIDF"
else
badpid="$!"
kill "$badpid"
sed "/^$badpid/d" "$__PIDF" >"$__PIDF~" &&
mv "$__PIDF~" "$__PIDF"
continue
fi
sleep 3
done
}
tunnel_autossh() {
set -- autossh -f "$@"
log "$@"
$_RUN || return
"$@" && printf '%s\t%s\n' "$!" "$*" >"$__PIDF"
}
untunnel() {
log "Killing tunnels"
if [ -e "$__PIDF" ]; then
while read -r pid _; do
kill "$pid" 2>/dev/null
done <"$__PIDF"
rm "$__PIDF"
else
pkill -x ssh
pkill -x autossh
fi
log "Done"
}
log() {
$_LOG && printf '%s: %s\n' "$PRGN" "$*" >&2
}
main "$@"
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