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Programmatically determine which eth0:x interfaces is requesting data

RonWensley
RonWensley asked
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Last Modified: 2014-12-31
Greetings,

I have edited the /etc/network/interfaces file to provide me with several eth0:x interfaces. Now I want to programmatically determine which interface or IP address a request is coming through.

For example; I have eth0:1 = 192.168.227.205 and eth0:2 = 192.168.227.206
From my laptop I can ping either address.
In linux I want to run a program that responds differently based on the IP address being hit. If .205 do this if .206 do that.

How can I programmatically determine which IP address is being hit?
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Commented:
Thank you for the quick response.  I looked up some example code for this and it looks like it will work perfectly.
Tom ChadaraviciusSenior Developer

Commented:
There's getifaddrs function, defined in ifaddr.h. Calling it will retrieve an array of interfaces and IP addresses.
http://man7.org/linux/man-pages/man3/getifaddrs.3.html

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