Connecting to a variable-IP SSH host on a set port.

plex

#!/bin/bash

PORT=58309
USER=ben
MOUNT_DIR=/mnt/plex
IDENTITY_FILE=~/.ssh/id_rsa_plex
CACHE_FILE=/tmp/optiplex-temp-ip.cache
IPS=$(cat $HOME/optiplex_ips)
TIMEOUT=1

scan() {
	output=$(timeout $TIMEOUT nc $1 $PORT | tr -d "\r")
	filtered=$(echo $output | grep -i "ssh")
	if [ "$filtered" != "" ] ; then
		echo $1
	fi
}

if [ "$1" == "-h" ] || [ "$1" == "--help" ] ; then
	echo "usage: $0 [-h/--help] [-c/--clean] [-t/--tunnel] [-f/--fs]"
	echo "    -h, --help     prints this message."
	echo "    -t, --tunnel   creates a tunnel to the web client."
	echo "    -c, --clean    removes the cache file."
	echo "    -f, --fs       mounts the home file system at /mnt/plex."
	exit
fi

if [ "$1" == "-c" ] || [ "$1" == "--clean" ] ; then
	if [ -f "$CACHE_FILE" ] ; then
		rm $CACHE_FILE
		echo Removed cache file.
	else
		echo No cache file. Doing nothing.
	fi
	exit
fi

if [ -f "$CACHE_FILE" ] ; then
	echo Ip already exists in cache.
else
	# Concurrent scans
	{
		for ip in $IPS ; do
			scan $ip &
		done
	} > $CACHE_FILE
	echo Scanning... Wait no longer than $TIMEOUT seconds.
	wait

	ips=$(cat $CACHE_FILE)
	num_ips=$(echo $ips | wc -w)

	if [ "$num_ips" -ne 1 ] ; then
		echo More than one, or no service was found!
		echo IPs: $ips
		rm $CACHE_FILE
		exit 1
	fi

	echo Found that $ips:$PORT was running SSH
fi

if [ "$1" == "-t" ] || [ "$1" == "--tunnel" ] ; then
	echo Tunneling localhost:8123 to destination:8080
	LISTEN_ARGS="-L 8123:localhost:8080 -N"
else
	LISTEN_ARGS=
fi

ip=$(cat $CACHE_FILE)

if [ "$1" == "-f" ] || [ "$1" == "--fs" ] ; then
	mkdir -p $MOUNT_DIR
	sudo sshfs -o allow_other,IdentityFile=$IDENTITY_FILE,StrictHostKeyChecking=no $USER@$ip:/home/$USER -p $PORT $MOUNT_DIR
	echo Mounted at $MOUNT_DIR
	exit 0
fi

echo ssh -X -i $IDENTITY_FILE $USER@$ip -p $PORT $LISTEN_ARGS
# StrictHostKeyChecking is disabled since the ip will vary a lot
ssh -X -i $IDENTITY_FILE $USER@$ip -p $PORT $ARGS $LISTEN_ARGS -o StrictHostKeyChecking=no