site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com The problem with the question is: if the client managed to connect to the web server, why does it need to ask for an address? A cgi-bin to figure out a local address to send back to the client that's already connected to it is somewhat pointless. It isn't pointless because you're assuming those addresses are the same, and that's a very bad assumption because of NAT. In fact, there are several web servers that offer the opposite service-- you connect, and they say "you came from THIS address." If the client is behind a NAT box, the reported address may or may not be different than what your local machine thinks its own address is. In fact, if you need to register a "client" with a dynamic DNS service or something like that, an external reverse probe like this is essential to getting the correct globally-routed address. I'm not sure what the original poster is trying to do, but I assume they know what they are doing. Well, I may not know completely what I am doing, but I am having a go..:-) Thanks for all the replies, I think I have plenty to go on with. Cheers Mark Gilbert. -- mark@gallery.co.uk Tel: +44 208 340 5677 fax: +44 870 055 7790 http://www.gallery.co.uk New Product ! - Zen MetaCorder Location Sound Field Recorder http://www.metacorder.info _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl...
Basically, I am adding a web based control interface to my application. The idea is that someone could control my app remotely from another CPU via a web browser. This is done by a very, very basic web-type server built inside my app (its just an open socket which spits out simple HTML as a reply to a client's connection). All the HTML is generated dynamically in C. So, first of all, I would like to have a status window in my app's GUI which tells a local user which address they need to enter remotely to control the app (without having to look elsewhere in the computer to find it). Also, I am creating (in C) an HTML web page with a 'refresh' line, to make the page automatically reload every 2 seconds (to generate a live update of status). In order to do that I have to code my own IP address into the HTML which I return to the client. So, there are 2 'pre-emptive' reasons why I need to know my own IP address, before starting any communications with the outside world. Hope this clears things up. I am sure there are simpler ways to do this with clever HTML or CGI's, but I am just a humble C programmer who likes to stick to what I know best, and it all needs to be wrapped up self contained and auto configuring inside my app. This email sent to site_archiver@lists.apple.com