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Change location automatically based on network
Authored by: Lliwynd on May 17, '07 08:50:36PM

I wanted something like this for a while. In general my network config doesn't change (it's DHCP based), except for the proxy configuration.

The solution I came up with was to write my own proxy.pac file that works for all locations, install it, and I'm done.

The proxy.pac file is a javascript function that gets called by the browser to find the proxy to use. I downloaded the proxy.pac files for all the different proxies I wanted to use, and then used a text editor to load them all into one file. I then created my own javascript function to do the switching. The result looks like this:

function FindProxyForURLLocationA(url, host) {
    // stuff from the location A proxy.pac FindProxyForURL() function

function FindProxyForURLLocationB(url, host) {
    // stuff from the location B proxy.pac FindProxyForURL() function

function FindProxyForURL(url, host) {
	myip = myIpAddress();

	result = "";

	if (isPlainHostName(host) || host=="" || host == "localhost") {
		result = "DIRECT";
	} else if (isInNet(myip, "" , "")) {
		result = FindProxyForURLLocationA(url, host);
	} else if (isInNet(myip, "", "")) {
		result = FindProxyForURLLocationA(url, host);
	} else if (isInNet(myip, "", "")) {
		result = FindProxyForURLLocationB(url, host);
	} else {
		result = "DIRECT";
	// if (!shExpMatch(url, "http:*")) {
	// 	result = result + "; DIRECT";
	// }
      // Return a proxy like this: "PROXY"

	return result;

This approach has the added advantage that it works for all OS's.

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