Add agent launchd instructions for OSX

Signed-off-by: Dimitrios Karagiannis <[email protected]>

README.md

@@ -10,6 +10,7 @@ Table of Contents
          * [Install](#install)
          * [Try](#try)
          * [Running as systemd service](#running-as-systemd-service)
+         * [Running as launchd service (OSX)](#running-as-launchd-service-osx)
          * [Run](#run)
          * [Config](#config)
          * [Dev aws config - Example](#dev-aws-config---example)
@@ -99,6 +100,34 @@ To look at it's logs:
 journalctl -u  wiresteward.service
 ```
 
+### Running as launchd service (OSX)
+
+An example working service for launchd is described in
+[uk.co.uw.wiresteward.plist](./contrib/uk.co.uw.wiresteward.plist).
+
+You need to copy the file under `/Library/LaunchDaemons/` and then set the
+ownership to root:
+```
+chown root:admin /Library/LaunchDaemons/uk.co.uw.wiresteward.plist
+```
+
+Finally, you need to load the service:
+```
+sudo launchctl load /Library/LaunchDaemons/uk.co.uw.wiresteward.plist
+```
+
+This will allow the service to run as root, which is required to operate on the
+network devices and routing table.
+
+Logs are stored in `/var/log/wirestward.log` as defined in the service file. To
+view the logs you can simply:
+```
+tail -f /var/log/wiresteward.log
+```
+
+You might want to setup log rotation as well if you find that the log file
+grows too large.
+
 ### Run
 
 The agent runs a local server on port 7773 and expects the user to visit

contrib/uk.co.uw.wiresteward.plist

@@ -0,0 +1,22 @@
+<?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>uk.co.uw.wiresteward</string>
+    <key>KeepAlive</key>
+    <true/>
+    <key>RunAtLoad</key>
+    <true/>
+    <key>ProgramArguments</key>
+    <array>
+      <string>/usr/local/bin/wiresteward</string>
+      <string>-agent</string>
+    </array>
+
+    <key>StandardErrorPath</key>
+    <string>/var/log/wiresteward.err.log</string>
+    <key>StandardOutPath</key>
+    <string>/var/log/wiresteward.log</string>
+  </dict>
+</plist>