Macで無線APを監視してhostsを書き換え

hosts_switch.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>hosts_switch</string>
	<key>LingonWhat</key>
	<string>sh /Users/retlet/Dropbox/settings/script/hosts_switch/hosts_switch.sh</string>
	<key>ProgramArguments</key>
	<array>
		<string>sh</string>
		<string>/Users/retlet/Dropbox/settings/script/hosts_switch/hosts_switch.sh</string>
	</array>
	<key>RunAtLoad</key> 
	<true />
	<key>StandardErrorPath</key>
	<string>/tmp/foo</string>
	<key>StandardOutPath</key>
	<string>/tmp/bar</string>
	<key>WatchPaths</key>
	<array>
		<string>/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist</string>
		<string>/Library/Preferences/SystemConfiguration/com.apple.network.identification.plist</string>
	</array>
</dict>
</plist>

hosts_switch.sh

#!/bin/sh

/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport -I | grep -q "ssig33"
ap=$?
 
if [[ "${ap}" -eq 0 ]];then

ed - /etc/hosts <<EOF
1,20s/10\.2\.0\.1  hanpen/192.168.1.2  hanpen/
1,20s/#192\.168\.1.2  hanpen\.mycloudnas\.com/192.168.1.2  hanpen.mycloudnas.com/
w
q
EOF

else

ed - /etc/hosts <<EOF
1,20s/192\.168\.1.2  hanpen/10.2.0.1  hanpen/
1,20s/192\.168\.1.2  hanpen\.mycloudnas\.com/#192.168.1.2  hanpen.mycloudnas.com/
w
q
EOF

fi

dir=`dirname $0`
date=`date '+%Y-%m-%d %T'`
echo ${date} ${ap} >>${dir}/log

hosts_switch_setup.sh

# launchd setup
copy_dir="/Library/LaunchDaemons"

cp -f hosts_switch.plist ${copy_dir}/hosts_switch.plist
chmod 644 ${copy_dir}/hosts_switch.plist
chown root:wheel ${copy_dir}/hosts_switch.plist

launchctl unload ${copy_dir}/hosts_switch.plist
launchctl load ${copy_dir}/hosts_switch.plist