pptp

#!/bin/sh
#
# pptp Automatically Detect and Restart Linux PPTP Client
#
# chkconfig: 2345 55 25
#
# author: Allex Wang ([email protected])
#
# */1  * * * * /etc/init.d/pptp start test >> /var/log/pptp_pinger.log 2>&1
#
# GistID: 3f2177cacc46a9b9bd170f580ed507ab
# GistURL: https://gist.github.com/3f2177cacc46a9b9bd170f580ed507ab

set -e

[ -f /etc/profile ] && . /etc/profile

lock_file=/tmp/vpn_check.lock

[ ! -f "$lock_file" ] || exit 1;

echo "$$" > "$lock_file"

exit_code()
{
  local ec=$1
  [ -n "$ec" ] || ec=0
  rm -f "$lock_file"
  exit $ec
}

trap 'exit_code' 0 1 2 3 9 13 15

get_gatway() {
  local c tunnel=$1
  case "$tunnel" in
    testing )
      c="192.168.0.0/24 192.168.0.10"
      ;;
    staging )
      c="192.168.200.0/24 192.168.200.1"
      ;;
    * )
      echo >&2 "Tunnel not found"
      exit_code 255
      ;;
  esac
  printf "$c"
}

start()
{
  local tunnel="$1"
  pppd call $tunnel updetach && \
  {
    local cfg=( `get_gatway "$tunnel"` )
    route add -net ${cfg[0]} gw ${cfg[1]}
  }
}

check() {
  local tunnel=$1
  local cfg=( `get_gatway "$tunnel"` )
  local ip=${cfg[1]}
  local PINGRES=`ping -c 2 $ip`
  local PLOSS=`echo $PINGRES : | grep -oP '\d+(?=% packet loss)'`
  if [ "100" -eq "$PLOSS" ]
  then
    echo "Loss result: $PLOSS"
    return 1
  fi
}

case "$1" in
  start)
    echo `date`
    if ! check "$2"; then
      start "$2" || exit_code 1
    else
      echo running...
    fi
    ;;
  stop)
    echo "not implements"
    ;;
  *)
    echo >&1 "Internal error"
    ;;
esac

exit_code $?