Install DNSmasq locally on Mac OS X via Homebrew

  6 Responses to “Install DNSmasq locally on Mac OS X via Homebrew”

1. 

   matt says:

   2012-02-14 at 00:36

   I’m curious if you know how to modify this setup to work with upstream servers provided by DHCP. Since you’re setting resolv-file=/etc/resolv.dnsmasq.conf dnsmasq is no longer paying attention to resolv.conf which is where os x lists the current dns servers. I can set dnsmasq to use resolv.conf but when i tell my machine to resolve DNS addresses locally I create a loop – my mac saves 127.0.0.1 to resolv.conf and the dhcp provided dns servers have disappeared from the file.

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     Philipp Klaus says:

     2012-02-14 at 10:20

     Hi matt, I would do it as follows:

     1. Configure dnsmasq to use a custom resolv file (/etc/resolv.dnsmasq.conf).
     2. Configure your system to use localhost (127.0.0.1 and ::1) as your DNS server.
     3. Set up a hook for network changes. That’s a script that should be called whenever your network interfaces change (get a new DHCP lease). In this script you should run ipconfig to find out the IP address(es) of the DNS server(s) that you are provided via DHCP and update dnsmasq’s custom resolv file accordingly. See below for details on how to parse it.

     
     

     So to set up a script to be run on network changes, I was looking for information on how to do it on google:

     1. Create a user daemon (in Library/LaunchDaemons) that watches the path /Library/Preferences/SystemConfiguration as shown in http://tech.inhelsinki.nl/locationchanger/
     2. As a dhcp hook. Stuff like dhcpcd-run-hooks (Linux) or /etc/dhclient-enter-hooks (NetBSD) doesn’t exist for Mac OS X.
     3. Before 10.5, adding your script to /System/Library/SystemConfiguration/Kicker.bundle/Contents/Resources/Kicker.xml has been an option. It is not anymore.

     If you need more help, please let me know ;-)

     
     

     update: I found a regex to parse the ipconfig command ( see https://gist.github.com/1825733 ):

     QUERY0="$(ipconfig getpacket en1)"
     DNS="$(echo $QUERY0 | sed 's/.domain_name_server (ip_mult): {\([^}]\)}.*/\1/')";
     echo $DNS

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2. 

   Jaison says:

   2012-03-25 at 02:12

   “You also have to uncomment the line that says listen-address=127.0.0.1″ Could you please tell me where I could find that line, to uncomment ? Sorry I’m quite new to OS X so please forgive my ignorance

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     Philipp Klaus says:

     2012-03-25 at 10:00

     Hi Jaison! The line listen-address=127.0.0.1 can be found in the file /usr/local/etc/dnsmasq.conf. ;-)

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3. Blazing Fast Local DNS in Mac OS X | maxcode says:

   2012-07-29 at 18:14

   [...] http://blog.philippklaus.de/2012/02/install-dnsmasq-locally-on-mac-os-x-via-homebrew/ [...]
4. The Case of the Mysterious Redirect | Content Here says:

   2012-11-08 at 18:47

   [...] machine.One thing that I learned from troubleshooting (in addition to .htaccess behavior) was about DNSMasq.  It allows you to create wildcard entries like .dev, which saves a lot of effort editing the [...]