Created new subdirectory for Fall developer day. (#60)

P4D2_2017_Fall/exercises/source_routing/send.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+import argparse
+import sys
+import socket
+import random
+import struct
+
+from scapy.all import sendp, send, get_if_list, get_if_hwaddr, bind_layers
+from scapy.all import Packet
+from scapy.all import Ether, IP, UDP
+from scapy.fields import *
+import readline
+
+def get_if():
+    ifs=get_if_list()
+    iface=None # "h1-eth0"
+    for i in get_if_list():
+        if "eth0" in i:
+            iface=i
+            break;
+    if not iface:
+        print "Cannot find eth0 interface"
+        exit(1)
+    return iface
+
+class SourceRoute(Packet):
+   fields_desc = [ BitField("bos", 0, 1),
+                   BitField("port", 0, 15)]
+
+bind_layers(Ether, SourceRoute, type=0x1234)
+bind_layers(SourceRoute, SourceRoute, bos=0)
+bind_layers(SourceRoute, IP, bos=1)
+
+def main():
+
+    if len(sys.argv)<2:
+        print 'pass 2 arguments: <destination>'
+        exit(1)
+
+    addr = socket.gethostbyname(sys.argv[1])
+    iface = get_if()
+    print "sending on interface %s to %s" % (iface, str(addr))
+
+    while True:
+        print
+        s = str(raw_input('Type space separated port nums '
+                          '(example: "2 3 2 2 1") or "q" to quit: '))
+        if s == "q":
+            break;
+        print
+
+        i = 0
+        pkt =  Ether(src=get_if_hwaddr(iface), dst='ff:ff:ff:ff:ff:ff');
+        for p in s.split(" "):
+            try:
+                pkt = pkt / SourceRoute(bos=0, port=int(p))
+                i = i+1
+            except ValueError:
+                pass
+        if pkt.haslayer(SourceRoute):
+            pkt.getlayer(SourceRoute, i).bos = 1
+
+        pkt = pkt / IP(dst=addr) / UDP(dport=4321, sport=1234)
+        pkt.show2()
+        sendp(pkt, iface=iface, verbose=False)
+
+    #pkt = pkt / SourceRoute(bos=0, port=2) / SourceRoute(bos=0, port=3);
+    #pkt = pkt / SourceRoute(bos=0, port=2) / SourceRoute(bos=0, port=2);
+    #pkt = pkt / SourceRoute(bos=1, port=1)
+
+
+if __name__ == '__main__':
+    main()