Python Ip Tools Example

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Basic Sniffer

Sniffers are programs that can capture/sniff/detect network traffic packet by packet and analyse them for various reasons. Commonly used in the field of network security. Wireshark is a very common packet sniffer/protocol analyzer. Packet sniffers can be written in python too. In this article we are going to write a few very simple sniffers in python for the linux platform. Linux because, although python is a portable, the programs wont run or give similar results on windows for example. This is due to difference in the implementation of the socket api.

Sniffers shown here dont use any extra libraries like libpcap. They just use raw sockets. So lets start coding them

The most basic form of a sniffer would be

Run this with root privileges or sudo on ubuntu :

The above sniffer works on the principle that a raw socket is capable of receiving all (of its type , like AF_INET) incoming traffic in Linux.

The output could look like this :

The above is a dump of the network packets in hex. They can be parsed using the unpack function.

Parsing the sniffed packet

Here is the code sniff and parse a TCP packet

The above code breaks down the packet into IP Header + TCP Header + Data.
The unpack function is used to break down the packet. Documentation

The output of the code should look like this :

According to RFC 791 an IP header looks like this :

If the IHL is 5 then total size is 20 bytes hence options+padding is absent.
For TCP packets the protocol is 6. Source address is the source IPv4 address in long format.

Next comes the TCP header :

and the balance after the TCP header is the data portion.

The C version of the code is here.
The Php version of the code is here.

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Note :

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1. The above sniffer picks up only TCP packets, because of the declaration :

For UDP and ICMP the declaration has to be :

You might be tempted to think of doing :

but this will not work , since IPPROTO_IP is a dummy protocol not a real one.

2. This sniffer picks up only incoming packets.

3. This sniffer delivers only IP frames , which means ethernet headers are not available.

Sniff all data with ethernet header

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Now let us see how we can overcome the above mentioned drawbacks. The solutions is quite simple.

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This line :

needs to be changed to :

Now the same socket will receive :

1. All incoming and outgoing traffic.

2. All Ethernet frames , which means all kinds of IP packets(TCP , UDP , ICMP) and even other kinds of packets(like ARP) if there are any.

3. It will also provide the ethernet header as a part of the received packet.

Here is the source code :

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The above program must be run with root privileges.

The output should be something like this :

It parses the Ethernet header and also the UDP and ICMP headers.

Ethernet header looks like this :

UDP Header according to RFC 768 : Ben 10 omniverse 1 free download iso.

ICMP Header according to RFC 792 :

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This kind of a sniffer does not depend on any external libraries like libpcap.

The C version of this code is here. Download games guitar hero 5 musik indo.

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Resources

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1. http://docs.python.org/library/socket.html