How to get IP address of chat message sender using XMPP protocol in Google App Engine?

Question

I am developing an app which can respond to user's chat message. I need to know the IP address of the chat message sender. I am doing my app on Google app Engine and using XMPP protocol for chatting purposes. How to detect IP address of a chat message sender using XMPP protocol?

Answer 1

Only the XMPP server knows the IP address. If you control the XMPP server you can write an extension to include the IP address in the messages somehow (or check if one is already available).

Answer 2

How to get my public IP from XMPP bind message?

http://xmpp.org/extensions/xep-0279.html

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First the client sends an IQ-get request to its server.

Example 1. Client requests its IP address from the server

<iq from='[email protected]/orchard'
    id='ik2s7159'
    type='get'>
  <address xmlns='urn:xmpp:sic:1'/>
</iq>

The server then returns an IQ-result containing an element containing an element specifying the client's external IP address and, optionally, a element specifying the client's external port.

Example 2. Server returns IP address and port

<iq id='ik2s7159'
    to='[email protected]/orchard'
    type='result'>
  <address xmlns='urn:xmpp:sic:1'>
    <ip>192.168.4.1</ip>
    <port>12345</port>
</iq>

Note that the IP address could be IPv4 or IPv6.

Example 3. Server returns IPv6 address

<iq id='ik2s7159'
    to='[email protected]/orchard'
    type='result'>
  <address xmlns='urn:xmpp:sic:1'>
    <ip>2001:db8::9:1</ip>
    <port>12345</port>
  </address>
</iq>