#!/usr/local/bin/bash

# ---------------------------------
# The Hovgaard Klan, DH, 2006-05-07
# ---------------------------------
# This script fetches the WAN incoming bytes per second from my internet
# router (a Soekris/m0n0wall box) through SNMP.
# The counter is created as "middle mode" which means it will
# summarize all data and divide by the number of datapoints.
#
# Start command:
# /usr/bin/nohup /root/scripts/wan_out.sh > /var/log/wan_out.log 2>&1 &
#
# This script starts up when my FreeBSD box does. It runs in a never
# ending loop. I prefer the other way of doing this (see WAN_IN.SH)
# but this is just to show how it is possible to get data every one
# second.
#

# Enable debug information
#set -x

# My router IP address and my counter ID (CID) - change this to your own
router_ip=192.168.1.1
counter_id=84df75c1123f7248f5105a40759f4715bee38270

first_run=1

while [ 1 -eq 1 ]; do

  snmp_get=`/usr/local/bin/snmpget -v2c -Oqvt -c public $router_ip system.sysUpTime.0 interfaces.ifTable.ifEntry.ifOutOctets.2`

  uptime_secs=`echo $snmp_get | /usr/bin/awk '{print $1}'`
  bytes_total=`echo $snmp_get | /usr/bin/awk '{print $2}'`

  if [ $first_run -eq 0 ]; then
    uptime_diff=`echo "scale=2; ($uptime_secs - $uptime_last) / 100" | /usr/bin/bc`
    bytes_diff=`echo "scale=0; $bytes_total - $bytes_last" | /usr/bin/bc`
    bytes_sec=`echo "scale=0; $bytes_diff / $uptime_diff" | /usr/bin/bc`

    if [ $uptime_secs -ge 0 ] && [ $bytes_total -ge 0 ]; then
      echo `/bin/date | /usr/bin/awk '{print $4}'`, "Uptime: $uptime_secs, Total bytes: $bytes_total, Diff secs: $uptime_diff, Bytes diff: $bytes_diff, Bytes/sec: $bytes_sec (wan_out.sh)"
      /usr/local/bin/curl --silent http://data.hovmon.com/?cid=$counter_id\&val=$bytes_sec > /dev/null
    fi

  fi

  uptime_last=$uptime_secs
  bytes_last=$bytes_total
  first_run=0

  sleep 1

done