locationchanger

#!/bin/bash

# automatically change configuration of Mac OS X based on location
# author: Rocco Georgi <rocco@pavingways.com>
# version: 0.4.0

# original author: Onne Gorter <o.gorter@gmail.com>
# url: http://tech.inhelsinki.nl/locationchanger/
# version: 0.4

# redirect all IO to a logfile
mkdir -p /usr/local/var/log
exec &>/usr/local/var/log/locationchanger.log

# to avoid any output, any logfile, uncomment the following:
#exec 1>/dev/null 2>/dev/null

# this service is called immediately after network activity.
# sleep a bit to make sure that info is finished writing to disk about those network changes
sleep 2

# determine location of this script
SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )

# get SSID
SSID=`/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport -I | awk -F ' SSID: ' '/ SSID:/ {print $2}'`
echo `date` "New SSID found: $SSID"

# empty location var
LOCATION=

# LOCATIONS
# (use to be used Location name here)
# =============================================
Location_Automatic="Automatic"
Location_Home="Home"
Location_Work="Company Intranet"

# SSIDS
# =====
SSID_TelekomPublic=Telekom
SSID_Home=HomeSSID
SSID_Work=WorkSSID


# SSID -> LOCATION mapping
case $SSID in
	$SSID_TelekomPublic ) LOCATION="$Location_Automatic";;
	$SSID_Home          ) LOCATION="$Location_Home";;
	$SSID_Work  ) LOCATION="$Location_Work";;
	# ... add more here
esac
REASON="SSID changed to $SSID"

# process mapping from text file
MAP_FILE=$SCRIPT_DIR/locationchanger.conf
if [ -f "$MAP_FILE" ]; then
  # echo "Checking mappings from file \"$MAP_FILE\""
  while IFS=' ' read -r loc wifi
  do
		if [[ "${loc}" == "#"*   ]]; then
			true # ignore comments
		elif [ -z "${loc}" ]; then
      true # ignore empty lines
		else
			wifi=$(echo $wifi | tr -d '"' ) # remove quotes
			# echo "location, wifi: \"$loc\", \"$wifi\" "
			if [[ "$wifi" == "$SSID" ]]; then
					LOCATION="$loc"
					REASON="SSID changed to $SSID using mapping file"
					break
			fi
		fi
  done < "$MAP_FILE"
fi

# still didn't get a location -> use Location_Automatic
if [ -z "$LOCATION" ]; then
	LOCATION="$Location_Automatic"
	REASON="Automatic Fallback"
fi

# Don't change if we're already there
current_location=$(networksetup -getcurrentlocation)
if [ "$current_location" = "$LOCATION" ]; then
    exit
fi

# change network location: will output "found it!"
if ! networksetup -switchtolocation "$LOCATION"; then
		osascript -e "display notification \"Failed to Change Network Location to: $LOCATION\" with title \"Network Update Failure\""
    exit 1
fi
echo "" # add linefeed after output from networksetup

# if present, callout to an external script
# use this script's dir and also a file-naming convention to determine if there is an external script to be run
EXTERNAL_CALLOUT="$SCRIPT_DIR/locationchanger.callout.sh"
if [[ -x "$EXTERNAL_CALLOUT" ]]; then
		echo "Calling external executable \"$EXTERNAL_CALLOUT\""
		output=$($EXTERNAL_CALLOUT "$LOCATION")
		exit_code=$?
		echo "exit code: $exit_code and output: $output"
fi

osascript -e "display notification \"Network Location Changed to $LOCATION\" with title \"Network Update\""

echo "--> Location Changer: $LOCATION - $REASON"

exit 0