Get local network interface addresses using only proc?

Question

How can I obtain the (IPv4) addresses for all network interfaces using only proc? After some extensive investigation I\'ve discovered the following:

Answer 1

cat /proc/net/tcp

Get the second column, with the heading "local_address", e.g. "CF00A8C0:0203"

The part after ":" is a port number.

From the rest use the last two (C0) as a hex number, e.g. C0 is 192, which is the start of the address in this example.

Took the following into my notes a while ago, from some smart point in the net:

The IP address is displayed as a little-endian four-byte hexadecimal number; that is, the least significant byte is listed first, so you'll need to reverse the order of the bytes to convert it to an IP address.

The port number is a simple two-byte hexadecimal number.