quesiton 3 and 4

week03/hard/client.py

@@ -0,0 +1,32 @@
+import socket
+
+# Fill in the right target here
+HOST = "netsec.net.in.tum.de"
+PORT = 20203
+
+
+def create_packet(src_ip, dst_ip, protocol, src_port, dst_port) -> str:
+    return f"{src_ip},{dst_ip},{protocol},{src_port},{dst_port}"
+
+
+def get_flag():
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+
+    s.connect((HOST, PORT))
+    sf = s.makefile("rw")  # we use a file abstraction for the sockets
+    # TODO
+    src_ip = "161.40.12.151"
+    dst_ip = "10.0.0.1"
+    protocol = "TCP"
+    src_port = 7331
+    dst_port = 1337
+    packet = create_packet(src_ip, dst_ip, protocol, src_port, dst_port)
+    print(f"Sending packet: {packet}")
+    sf.write(packet + "\n")
+    sf.flush()
+    response = sf.readline().strip()
+    print(f"Server response: {response}")
+
+
+if __name__ == "__main__":
+    get_flag()