Read IP-layer headers using Java sockets

Question

Is there a way (in Java) to read IP-layer headers (I'm interested in src & dst IPs), using TCP or UDP socket?

I know it's possible using pcap (packet capture), but I didn't find a way to do it using sockets. What's the reason behind that?

score 1 · Accepted Answer · answered Mar 18 '19 at 12:47

At the operating system level, you need raw sockets to access IP-layer headers. But fortunately raw sockets don't exist in pure Java so you need native code to make the relevant syscalls.

There are Java libraries that use a JNI component for the native calls. One example (which I used successfully in the past) is Rocksaw.

score 0 · Answer 2 · answered Mar 18 '19 at 12:35

0

You can just open /dev/socket as a InputStream and read data coming into to socket.

answered Mar 18 '19 at 12:35

vavasthi

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Read IP-layer headers using Java sockets

2 Answers2