first commit

Task pwn02/week02/easy/client.py

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+import hashlib
+import logging
+import time
+
+import threading
+
+from scapy.config import conf
+from scapy.layers.inet import TCP, IP
+from scapy.packet import Packet
+from scapy.sendrecv import send, sniff
+
+from random import randrange
+
+log = logging.getLogger(__name__)
+TCP_CLIENTS = {}  # ((IP, port) -> [sent_packets])
+
+# SERVER_IP = '131.159.15.68' # don't use the domain name in this case
+
+SERVER_IP = "127.0.0.1"  # don't use the domain name in this case
+SERVER_PORT = 20102
+COOKIE_SECRET = "TASTY_COOKIES123"
+
+SRC_PORT = randrange(10000, 50000)
+
+
+def generate_syn_cookie(client_ip: str, client_port: int, server_secret: str):
+    # TODO: please implement me!
+    return 0
+
+
+def handle_packet(packet: Packet):
+    # TODO: please implement me!
+    packet.show()
+
+
+# Function to start the packet sniffing
+def start_sniffing():
+    sniff(
+        filter=f"tcp port {SERVER_PORT}",  # this should filter all packets relevant for this challenge.
+        prn=handle_packet,
+        store=False,
+        monitor=True,
+        iface="eth0",  # set to your interface. IMPORTANT: SET TO enX0 FOR AUTOGRADER!!!
+    )
+
+
+COOKIE = generate_syn_cookie(SERVER_IP, SERVER_PORT, COOKIE_SECRET)
+
+
+# Run the server in a separate thread
+def main():
+    conf.use_pcap = False
+    server_thread = threading.Thread(target=start_sniffing)
+    server_thread.start()
+
+    time.sleep(1)  # wait for the sniffer to start.
+
+    # TODO: send intial first byte
+
+
+if __name__ == "__main__":
+    logging.basicConfig(
+        level=logging.INFO,
+        format="%(asctime)s %(levelname)s [%(module)s:%(lineno)d] %(message)s",
+    )
+
+    logging.getLogger("asyncio").setLevel(logging.WARNING)
+
+    main()