install.sh

#!/bin/bash
set -e

echo
echo "= rloop installer — May the Ports Be With You. ="
echo

# Use the source Luke
parse() {
  local prev=

  # Search your feelings
  for arg in "$@"; do
    # These are the droids we are looking for
    if [[ "$arg" =~ [^0-9:] ]]; then
      [[ -n "$prev" ]] && printf '%s\n' "$prev"

      prev="$arg"
    else
      prev+=" $arg"
    fi
  done

  # Let the Wookie win!!!
  [[ -n $prev ]] && printf '%s\n' "$prev"
}

# --- 1. Look for the dorids ---
if ! command -v autossh >/dev/null; then
  echo "[*] Installing autossh..."
  if command -v apk >/dev/null; then
    apk update && apk add autossh
  elif command -v dnf >/dev/null; then
    dnf install -y autossh
  elif command -v apt-get >/dev/null; then
    apt-get update && apt-get install -y autossh
  elif command -v yum >/dev/null; then
    yum install -y autossh
  elif command -v pacman >/dev/null; then
    pacman -Sy --noconfirm autossh
  else
    echo "No supported package manager found — install autossh manually and pray."
    exit 1
  fi
fi

# --- 2. Save rebel battle plans ---
cat >> /etc/rlooprc < <(parse "$@") 

# --- 3. Release the droids ---
cat > /usr/local/bin/rloop <<'SCRIPT'
#!/bin/bash
# © 2025 FRINKnet & Friends – MIT LICENSE
#  rloop — May the Ports Be With You!!!

export TEST=0
export VER="1.2"
export BIN="${0##*/}"
export PIDS=()

set -m	# Enable job control
trap "kill -- -$$" EXIT

# Trust. But verify...
if [[ "$1" == "--test" ]]; then
	TEST=1

	shift
fi

# For those who don't understand the Force
help() {
	echo
	echo " © 2025 FRINKnet & Friends – MIT LICENSE"
	echo "	rloop — May the Ports Be With You!!!"
	echo
	echo "	Usage: $0 [--test] user@server port[:remote] …"
	echo

	exit 1
}

# Use the source Luke
parse() {
	local prev=

	# Search your feelings
	for arg in "$@"; do
		# Bring balance to the Force
		if [[ "$arg" =~ [^0-9:] ]]; then
			[[ -n "$prev" ]] && printf '%s\n' "$prev"

			prev="$arg"
		else
			prev+=" $arg"
		fi
	done

	# Let the Wookie win!!!
	[[ -n $prev ]] && printf '%s\n' "$prev"
}

# Almost there... Almost there...
mapping() {
	local mapping left right tunnel_args=

	# The odds of navigating are 3720 to 1
	for mapping in "$@"; do
		left="${mapping%%:*}"
		right="${mapping##*:}"

		# Stupid users need to be warned
		if [[ -z $left || -z $right ]]; then
			echo "Error: mapping '$mapping' is malformed... Oh the insanity of it all!" >&2

			exit 3
		fi

		# May the wrath of Yoda rain down!
		if ! [[ $left =~ ^[0-9]+$ && $right =~ ^[0-9]+$ ]]; then
			echo "Error: mapping '$mapping' contains non-numeric ports… RAGE QUITTING!" >&2

			exit 4
		fi

		# New fluent in over &m forms of communication
		tunnel_args+=" -R 0.0.0.0:${right}:localhost:${left}"
	done

	# now fluent in over 7m form of communication
	echo "$tunnel_args"
}

# Take us to Coruscant!!!
connect() {
	local tunnel_args server ports err

	server="$1"; shift
	ports=( "$@" )

	# Guardrails so you don’t tunnel into a reverse Death Star
	if [[ "$server" =~ ^[0-9]+$ || "$server" =~ ^[0-9]+\.[0-9]+$ ]]; then
		echo "Error: '$server' looks like a port or rogue asteroid." >&2

		exit 2
	fi

	# Prepare to jump to hyperspace
	tunnel_args="$(mapping "${ports[@]}")"

	# if the padowans come to play...
	if (( TEST )); then
		echo
		echo "TESTING: autossh -M0 -N -o ServerAliveInterval=2 -o ServerAliveCountMax=3 -o ExitOnForwardFailure=yes $server$tunnel_args"
		echo

		autossh -M0 -N \
			-o "ServerAliveInterval=2" -o "ServerAliveCountMax=3" \
			-o "ExitOnForwardFailure=yes" "$server" $tunnel_args

		err=$?

		echo

		if (( err == 0 )); then
			echo "	...Test complete. No hull breaches detected."
			echo
			return
		else
			echo "	POODOO!!! - Banthas detected... - exit $err" >&2
			echo
			exit $err
		fi
	fi

	(
		# Eternal tunnel loop
		while true; do
			# This should not fail
			autossh -M0 -N \
				-o "ServerAliveInterval=2" -o "ServerAliveCountMax=3" \
				-o "ExitOnForwardFailure=yes" "$server" $tunnel_args

			# If it does wait two bits
			sleep 2

			# Go on like this FOREVER!!!
		done

		# Usa da boomba!!
	) &

	# Me lika disa one!
	PIDS+=( $! )
}

# Are there Midi-Chlorians here?
if [ ! -t 0 ]; then
	mapfile -t lines
else
	mapfile -t lines < <(parse "$@")
fi

# The Jedi forbid aimless excess
if (( ${#lines[@]} == 0 )); then
	help
fi

# Beware of the Dark Side
for line in "${lines[@]}"; do
	read -r server rest <<< "$line"
	read -ra ports <<< "$rest"

	# Skip if server is purely digits/colons
	[[ "$server" =~ ^[0-9:]+$ ]] && continue

	# Skip if ports array empty or any port fails numeric check
	[[ ${#ports[@]} -eq 0 ]] && continue
	for p in "${ports[@]}"; do
		[[ ! "$p" =~ ^[0-9]+$ ]] && continue 2
	done

	# Reach out to the Force all around
	connect "$server" "${ports[@]}"
done

# Patience is a virtue young padawan.
for pid in "${PIDS[@]}"; do
	wait "$pid"
done
SCRIPT

# --- 4. Land on Tatooine ---
chmod +x /usr/local/bin/rloop

# --- 5. Enter in the Pod Race ---
cat > /etc/systemd/system/rloop.service <<SERVICE
[Unit]
Description=Persistent autossh multi-port reverse tunnel via rloop
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/bin/bash -c 'cat /etc/rlooprc | /usr/local/bin/rloop'
Restart=always
RestartSec=5
User=root

[Install]
WantedBy=multi-user.target
SERVICE

# --- 5. Engage Hyperdrive ---
systemctl daemon-reload
systemctl enable --now rloop

echo "= rloop is live... TRUST BUT VERIFY!!! ="