Packet Sniffing using Raw Sockets in Linux in C

I need to write a packet sniffer in Linux that detects HTTPS packet that are sent and save the url from the request. I found code for this in security-freak and ran it. This code runs and only sniffs the received packet but I need to get the sent packet in the sniffer. How do I get the sent packet in this code?

I can't us开发者_如何学编程e any library like libcap (forbidden). The code is :sniffer.c

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You should be using ETH_P_ALL instead of ETH_P_IP as the protocol. ETH_P_IP only listens for incoming IP packets.

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Why can't you use any library? Homework?

It's hard to answer without having examples from your code, for example how you set sll_pkttype.

The urlsnarf tool in the dnsiff suite could be worth a look.

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With appropriate libpcap or DNET usage You should be able to get all network traffic on the desired layer (protocol - 5) (also this outgoing). But You should know that already.

You need to go through the above libraries manuals and find the appropriate filtering.