9/12/2023 0 Comments Python packet sniffer![]() The unpack function is used to break down the packet. The above code breaks down the packet into IP Header + TCP Header + Data. Print 'Source Port : ' + str(source_port) + ' Dest Port : ' + str(dest_port) + ' Sequence Number : ' + str(sequence) + ' Acknowledgement : ' + str(acknowledgement) + ' TCP header length : ' + str(tcph_length) Print 'Version : ' + str(version) + ' IP Header Length : ' + str(ihl) + ' TTL : ' + str(ttl) + ' Protocol : ' + str(protocol) + ' Source Address : ' + str(s_addr) + ' Destination Address : ' + str(d_addr) ![]() Iph = unpack('!BBHHHBBH4s4s', ip_header) #take first 20 characters for the ip header Error Code : ' + str(msg) + ' Message ' + msg Here is the code sniff and parse a TCP packet They can be parsed using the unpack function. The above is a dump of the network packets in hex. ![]() 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. Run this with root privileges or sudo on ubuntu : S = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP) ![]() So lets start coding them,The most basic form of a sniffer would be: Sniffers shown here dont use any extra libraries like libpcap. ![]() This is due to difference in the implementation of the socket api. Linux because, although python is a portable, the programs wont run or give similar results on windows for example. In this article we are going to write a few very simple sniffers in python for the linux platform. Packet sniffers can be written in python too. Wireshark is a very common packet sniffer/protocol analyzer. Commonly used in the field of network security. Sniffers are programs that can capture/sniff/detect network traffic packet by packet and analyse them for various reasons. ![]()
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