CODEWITHSUNDEEP
javasocketsnetwork-programming
Keir Nellyer
Keir Nellyer

Reputation: 923

Get a domain from Socket

I am trying to get the domain a user is connection to (e.g. test.somesite.com) from a Socket, is this possible? The reason I would like this is to redirect users based on where they came from. I get the socket from running serverSocket.accept() in another thread

I have tried:

clientSocket.getLocalAddress().getHostAddress();
clientSocket.getHostAddress().toString();

They both just print my own local/internal IP address. How can I get the domain they came through from that?

Edit: I think this could be possible because for example, in an Apache web server you can do this in your httpd.conf file:

<VirtualHost *:80>
  ServerName something.something.com
  ProxyPass               /       http://localhost:8080/
  ProxyPassReverse        /       http://localhost:8080/
</VirtualHost>

This will listen on port 80, check if the url they came from is something.something.com, and if it is it will redirect to port 80. Maybe I am completely wrong because I'm new to networking in Java but please let me know if you have any hints, even if I have to rewrite my code its fine.

Edit 2: I found out this is impossible because the target application resolves the domain name to an IP address before it connects. Thanks for all your help though

Keir

Upvotes: 0

Views: 2056

Answers (2)

Remy Lebeau
Remy Lebeau

Reputation: 598424

Try this:

clientSocket.getInetAddress().getHostName()

Update: Alternatively, try this:

((InetSocketAddress)clientSocket.getRemoteSocketAddress()).getAddress().getHostName()

Upvotes: 1

spoindl
spoindl

Reputation: 1

I don't think you can get the domain without a DNS, but you could use the getRemoteSocketAddress() method from clientSocket to get the client IP address.

clientSocket.getRemoteSocketAddress();

Upvotes: 0

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