Sending a reset in TCP/IP Socket connection
Turn the SO_LINGER socket option on and set the linger time to 0 seconds. This will cause TCP to abort the connection when it is closed, flush the data and send a RST. See section 7.5 and example 15.21 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
s.close()
If you want to implement your own behavior over connections I think you should try using Scapy. It is a really useful library/tool. It lets you play with IP/TCP/UDP/ICMP packages.