Decide which proxies to use in ssh on Mac OS X based on your current network settings.

proxy

# Usage: add 'ProxyCommand ~/.ssh/proxy %h %p' to your ~/.ssh/config file

#set -x

connect_directly() {
  nc -X 5 $1 $2
}

connect_to_host_outside_the_bbc_from_within() {
  nc -x "socks-gw.reith.bbc.co.uk:1085" -X 5 $1 $2
}

connect_to_host_inside_the_bbc_from_outwith() {
  echo "The host '$1' is inside the BBC network and you appear not to be."
  echo "Please connect to BBC Network, Corporate Wifi or the VPN and try again."
  exit
}

connect_to_home_net() {
  ssh [email protected] exec nc -q0 $1 $2
}

is_local_host() {
  [[ "$1" == "localhost" || "$1" == "127.0.0.1" ]]
}

is_host_a_local_vm() {
  [[ "$1" =~ "sandbox.dev.bbc.co.uk" || "$1" =~ "sandbox.bbc.co.uk" ]]
}

is_host_on_reith_net() {
  [[ "$1" =~ "national.core.bbc.co.uk" || "$1" =~ "gateway.bbc.co.uk" || "$1" =~ "reith.bbc.co.uk" ]]
}

is_host_on_home_net() {
  [[ "$1" =~ ".ochiltree.xgusties.com" ]]
}

vpn_connected() {
  local status=`scutil --nc status "BBC VPN" | sed -n 1p`
  [[ "$status" = "Connected" ]]
}

bbc_on_network() {
  NETWORK_LOCATION="$(/usr/sbin/scselect 2>&1 | egrep '^ \* ' | sed 's:.*(\(.*\)):\1:')"
  [[ "$NETWORK_LOCATION" = "BBC On Network" ]]
}

function decide_how_to_connect() {
  if is_host_on_home_net "$1"; then
    connect_to_home_net $1 $2
  else

    if bbc_on_network || vpn_connected; then
      if is_local_host "$1" || is_host_a_local_vm "$1" || is_host_on_reith_net "$1"; then
        connect_directly $1 $2
      else
        connect_to_host_outside_the_bbc_from_within $1 $2
      fi
    else
      if is_host_on_reith_net "$1"; then
        connect_to_host_inside_the_bbc_from_outwith $1 $2
      else
        connect_directly $1 $2
      fi
    fi

  fi
}

decide_how_to_connect $1 $2