Sniffing Package Using Raw Sockets on Linux in C

Question

I need to write a Linux packet sniffer that detects an HTTPS packet that is sent and saves the URL from the request. I found the code for this in security-freak and ran it. This code works and only sniffs the received packet, but I need to get the sent packet to the sniffer. How to receive the sent packet in this code?

I cannot use any library like libcap (forbidden). Code: sniffer.c

Answer 1

You should use ETH_P_ALL instead of ETH_P_IP as a protocol. ETH_P_IP only listens for incoming IP packets.

Answer 2

Why can't you use any library? Homework?

It is difficult to answer without having examples from your code, for example, how you installed sll_pkttype.

The urlsnarf tool in the dnsiff Suite may be worth a look.

Answer 3

libpcap DNET ( - 5) ( ). .

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