Manage SSH proxy tunnels to a number of hosts

tunnels

#!/usr/bin/env bash
# tunnel browser to another box

# Copyright (c) 2013 Jason W Ryan
# The MIT License (MIT) http://opensource.org/licenses/MIT

user="<your_name>"
exip="XXX.XXX.XXX.XXX"
tunnel_id="$HOME/.local/tmp/tunnel_id"

usage () {
    cat <<EOF
tunnel -[x,y,z,d,h]
       -x | xbox Host_x
       -y | ybox Host_y
       -z | zbox Host_z
       -d | down
       -h | help print this message

EOF
}

get_host(){
  case "$opt" in
    -x|xbox) octet="10"
             port="210"
             ;;
    -y|ybox) octet="20"
             port="220"
             ;;
    -z|zbox) octet="30" 
             port="230"
             ;;
    -d|down) down_tun
             ;;
    -h|help) usage && exit 1
             ;;
  esac
  # test for LAN
  testip=$(curl -s icanhazip.com)

  if [[ $exip == $testip ]]; then
    SSH_HOST="${user}@192.168.1.${octet} -p ${port}"
  else
    SSH_HOST="${user}@${exip} -p ${port}"
  fi

  # store the tunnel details
  mkfifo "$tunnel_id"
  printf '%s\n' "$SSH_HOST" >"$tunnel_id" &
}

up_tun(){
  ssh -f -N -D 8080 -M -S /tmp/ssh_tunnel_%h.sock -o ExitOnForwardFailure=yes \
  $SSH_HOST && \
  printf '%s\n' "ssh tunnel started successfully" || \
  printf '%s\n' "ssh tunnel failed to start"
}

down_tun(){
  SSH_HOST=$(<"$tunnel_id")
  ssh -S /tmp/ssh_tunnel_%h.sock -O exit $SSH_HOST 2>/dev/null && \
    printf '%s\n' "SSH tunnel closed"
  # cleanup fifo
  [[ -p $tunnel_id ]] && rm "$tunnel_id"
}

run_tun(){
  get_host
  up_tun && chromium --proxy-server="socks://127.0.0.1:8080" &>/dev/null &
}

opt="$1"
if (( $# != 1 )); then
  printf "%s\n" "Wrong number of parameters…"
  usage
  exit 1
else
  case "$opt" in
    -d|down) down_tun 
         ;;
    -x|xbox|-y|ybox|-z|zbox) run_tun
         ;;
     *) usage && exit 1 
         ;;
  esac
fi

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