Adding payload in packet

Question

Can I insert image or document (in MBs) as a data in packet using scapy?

This is what I did to send data.

data = "University of texas at San Antonio"
a = IP(dst="129.132.2.21")/TCP()/data
send(a)

Kal

What are you really trying to do with this? Build your own file streamer in python? If so, there are much easier ways to do that than scapy – Punctual

Answer 1

Yes, you can send raw data like this. In this example, data will be ASCII encoded.

>>> data = 'University of Texas at San Antonio'
>>> a = IP(dst='129.132.2.21') / TCP() / Raw(load=data)
>>> send(a)

Subtorrid

That works, but does it do what is intended ? don't you need to send at least two packets for the TCP handshake to work ? wouldn't this payload be simply discarded by the recipient ? – Biofeedback

@Biofeedback You are correct, sending a single TCP packet with data is not the same as establishing a TCP connection via the three-way hand shake and then transmitting data that would be accepted by a real TCP stack. This answer was simply about adding data after a TCP header. – Subtorrid