[ACCEPTED]-Sending a reset in TCP/IP Socket connection-reset

Accepted answer
Score: 44

Turn the SO_LINGER socket option on and 5 set the linger time to 0 seconds. This 4 will cause TCP to abort the connection when 3 it is closed, flush the data and send a 2 RST. See section 7.5 and example 15.21 1 in UNP.

In python:

def client(host, port):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
    s.connect((host, port))
    l_onoff = 1                                                                                                                                                           
    l_linger = 0                                                                                                                                                          
    s.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER,                                                                                                                     
                 struct.pack('ii', l_onoff, l_linger))
    # send data here
Score: 3

If you want to implement your own behavior 3 over connections I think you should try 2 using Scapy. It is a really useful library/tool. It 1 lets you play with IP/TCP/UDP/ICMP packages.

Score: 2

To send an RST on a TCP connection, set 4 the SO_LINGER option to true with a zero timeout, then 3 close the socket. This resets the connection. I 2 have no idea how to do that in Python, or 1 indeed whether you can even do it.

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