dnsmasq setup for osx

dev.conf

# put in /usr/local/etc/dnsmasq.d/
address=/dev/10.1.1.10

dnsupdater.sh

#!/bin/bash

# DnsChanger
#
# Automatically change dnsmasq's forward lookup to the dhcp provided dns server.
# Based off of Onne Gorter's LocationChanger which can be found at
# http://tech.inhelsinki.nl/locationchanger/.
#
# author: Codey Whitt <codey.whitt@gmail.com>
# version: 0.1

# redirect all IO to /dev/null (comment this out if you want to debug)
exec 1>/dev/null 2>/dev/null

# get a little breather before we get data for things to settle down
sleep 5

# Clear the file and set the DNS
echo '# Setting DNS from DHCP' > /usr/local/etc/resolv.dnsmasq.conf

# Get the DNS from the DHCP
DNS=`ipconfig getpacket en1 | grep domain_name_server | egrep -o '\{(.*)\}?' | cut -d '{' -f 2 | cut -d '}' -f 1`

OLD_IFS=$IFS;
IFS=', ' read -a servers <<< "$DNS"
IFS="$OLD_IFS"

for ns in "${servers[@]}"
do
  echo "nameserver $ns" >> /usr/local/etc/resolv.dnsmasq.conf
done

echo `date` "DNS set to: $DNS" >> /var/log/dnsupdater.log

# Sleep some more so your system won't think your crashing
sleep 5

visualguruz.dnsmasq-osx.dnsupdater.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN"
        "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
          <key>Label</key>
          <string>visualguruz.dnsmasq-osx.dnsupdater</string>
          <key>ProgramArguments</key>
          <array>
                  <string>/usr/local/bin/dnsupdater.sh</string>
          </array>
          <key>WatchPaths</key>
          <array>
                  <string>/Library/Preferences/SystemConfiguration</string>
          </array>
  </dict>
</plist>