Can you print SYNACK and my_ack (though they seem to be set correctly)? 7 years, 11 months ago Ive updated the question. Print repr(tcp_hs.send_data("INTENTIONAL BAD REQUEST\r\n\r\n\r\n"))Ĥ 6 years, 10 months ago Related Topics python scapy Comments 7 years, 11 months ago The SYN-ACK packet is logged as ack, which seems to indicate an ack with an expected sequence number of 1 instead of 2541678706.
If pkt.flags & 0x3f = 0x12: # SYN+ACKĮlif pkt.flags & 0x3f = 0x10: # FIN+ACK If pkt and pkt.haslayer(IP) and pkt.haslayer(TCP): If pkt.haslayer(IP) and pkt.dst = self.l4.src \Īnd pkt.haslayer(TCP) and pkt.dport = self.sport \Īns = sniff(filter="tcp port %s"%self.target,lfilter=self.match_packet,count=1,timeout=1) Self.l4 = IP(dst=target)/TCP(sport=self.sport, dport=self.dport, flags=0, #> iptables -A OUTPUT -p tcp -tcp-flags RST RST -s -j DROP Note: linux might send an RST for forged SYN packets.
For reference, this is the code: #!/usr/bin/env pythonĭEBUG:_main_:init: ('', 80) This gist implements a simple scapy three-way handshake class based on the example in. > SYNīelow shows a successful and unsucessful connection. Note this was for a different connection. Ive also printed the output of each of the packets directly from python. However on the server I see only SYN_RECV even though the return SYN-ACK is sent and the ACK is sent in return. Using the following code, #!/usr/local/bin/python Im trying to build a 3 way handshake in Scapy.
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