HOWTO Use custom DNS redirects to save browser keystrokes
Given the recent interest in DNS and its role in the public infrastructure of the Internet, sparked by the release of Google Public DNS, here’s a hack that can help you save keystrokes in the browser while accessing your favorite sites. Instead of typing in “youtube.com” or “twitter.com”, you can just type “y” or “t”. If you’re looking for a map of San Francisco, CA, you can type “map/sf” and jump to the right place in Google Maps.
A bright bold blinking marquee disclaimer before we start: this is advanced territory. If you don’t know what sudo is and why 127.0.0.1 is special, be careful following these instructions because you may unintentionally destroy your ability to do anything at all on the Internet — including looking up instructions for getting unstuck. Also, these instructions only apply to Mac OS X and Linux, or other UNIX variants.
Redirect custom DNS hostnames to frequently-accessed sites
The file /etc/hosts on your machine is consulted by the DNS resolver before making a request to a DNS server. The idea is to add new DNS entries to the hosts file on your machine, pointing short domains such as g and t to 127.0.0.1. Now, whenever you type g or t into your browser, the hostname will be matched from your /etc/hosts file, instead of receiving an NXDOMAIN reply (i.e., this domain does not exist) from an upstream DNS provider. Since this request is received by your own machine, you can then handle it to do whatever you want, including, but not limited to, redirecting the user to the intended destination.
This HOWTO assumes that Apache is installed and running on your system with PHP and mod_rewrite support.
Modify /etc/hosts
Open /etc/hosts in your favorite text editor, and add one line for each shortcut you’d like to set up. Leave everything else unchanged. (You will need to sudo edit this file.)
## # Host Database # # localhost is used to configure the loopback interface # when the system is booting. Do not change this entry. ## 127.0.0.1 localhost 127.0.0.1 c # for Calendar 127.0.0.1 f # for Facebook 127.0.0.1 g # for Google Search 127.0.0.1 m # for Mail 127.0.0.1 map # for Maps 127.0.0.1 t # for Twitter 127.0.0.1 w # for Wikipedia 127.0.0.1 y # for Yelp 127.0.0.1 yo # for YouTube 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost
You can test that this change worked, by typing in the address (e.g. http://g/ in your browser. Instead of seeing a page that says that your browser “can’t find the server ‘g’”, now you would see a page saying that your server isn’t configured correctly, or welcome to Apache, or whatever you would see if you typed http://localhost/ instead. If that worked, proceed.
Configure Apache to handle requests for unknown domains/URIs
Edit the following lines in /etc/apache2/httpd.conf. The following code shows an excerpt with lots of context around the line you need to edit. Locate the relevant section in your file.
#
# This should be changed to whatever you set DocumentRoot to.
#
Locate your Apache root directory. It’s usually /Library/WebServer/Documents on the Mac or /var/www in Ubuntu. If you’re unsure, check where it is by issuing the following command in a terminal: (assuming you’re running Apache 2.x)
grep “DocumentRoot” /etc/apache2/httpd.conf
In that directory, save the following file. It should be named exactly .htaccess. (That’s htaccess with a period at the beginning, so it’s a hidden file on UNIX.) Save it as /Library/WebServer/Documents/.htaccess on Mac OS X or /var/www/.htaccess on Ubuntu.
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) /index.php [L]
The actual redirection script
Here’s the script that I use for redirection, but you can roll out your own, and do anything with each request you receive. (If you do something phenomenally awesome, I’d love to hear about it in your comments.) As you can see, it’s customized to the sites I frequent, including location preferences (e.g. the Yelp shortcut takes me to Yelp San Francisco directly. The search box is preconfigured for SF.)
Save this as /Library/WebServer/Documents/index.php (on Mac OS X) or as /var/www/index.php on Ubuntu.
<?php
$uri = preg_replace('/^\//', '', $_SERVER['']);
switch($_SERVER['']) {
case '':
('');
break;
case '':
('');
break;
case '':
('' . $uri);
break;
case '':
('');
break;
case '':
('' . $uri);
break;
case '':
('');
break;
case '':
if ('' === $uri) {
('');
} else {
('' . $uri);
}
break;
case '':
if ('' === $uri) {
('');
} else {
('' . $uri);
}
break;
case '':
if ('' === $uri) {
('');
} else {
('' . $uri);
}
break;
}
{
header('' . $url);
}
?>
That’s it, now type your shortcuts into your browser instead of the longer URLs, and there you are. If you run into trouble, leave a comment and I’ll address it.
The only downside of this approach
Redirecting involves an additional HTTP request to your machine, which introduces additional latency. The request, however, is from your machine to your machine itself, so there’s no network involved. Personally, I feel that the keystrokes saved by the technique would have taken longer to type than the shortcuts I set via this method. But you don’t lose anything if you set this up and don’t use it — just continue to type entire URLs and you will never pay a latency penalty.
For this, I use two great tools, 
In any case, I’m happy, because the older Opera Mini didn’t even let you customize the home screen to pick a search engine. I hope that has changed too (user choice is good.)
