from scapy.all import Ether, IP, ICMP
from resources.libraries.python.PacketVerifier \
- import Interface, create_gratuitous_arp_request, auto_pad
+ import Interface, create_gratuitous_arp_request, auto_pad, checksum_equal
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
def check_ttl(ttl_begin, ttl_end, ttl_diff):
if ttl_begin != ttl_end + ttl_diff:
- src_if.close()
- if dst_if_defined:
- dst_if.close()
- raise Exception(
+ raise RuntimeError(
"TTL changed from {} to {} but decrease by {} expected"
- .format(ttl_begin, ttl_end, hops))
+ .format(ttl_begin, ttl_end, ttl_diff))
def ckeck_packets_equal(pkt_send, pkt_recv):
- pkt_send_raw = str(pkt_send)
- pkt_recv_raw = str(pkt_recv)
+ pkt_send_raw = auto_pad(pkt_send)
+ pkt_recv_raw = auto_pad(pkt_recv)
if pkt_send_raw != pkt_recv_raw:
print "Sent: {}".format(pkt_send_raw.encode('hex'))
print "Received: {}".format(pkt_recv_raw.encode('hex'))
print "Sent:"
- Ether(pkt_send_raw).show2()
+ pkt_send.show2()
print "Received:"
- Ether(pkt_recv_raw).show2()
- src_if.close()
- if dst_if_defined:
- dst_if.close()
- raise Exception("Sent packet doesn't match received packet")
-
-
-args = TrafficScriptArg(['src_mac', 'dst_mac', 'src_ip', 'dst_ip',
- 'hops', 'first_hop_mac', 'is_dst_defined'])
-
-src_if_name = args.get_arg('tx_if')
-dst_if_name = args.get_arg('rx_if')
-dst_if_defined = True if args.get_arg('is_dst_defined') == 'True' else False
-
-src_mac = args.get_arg('src_mac')
-first_hop_mac = args.get_arg('first_hop_mac')
-dst_mac = args.get_arg('dst_mac')
-src_ip = args.get_arg('src_ip')
-dst_ip = args.get_arg('dst_ip')
-hops = int(args.get_arg('hops'))
-
-if dst_if_defined and (src_if_name == dst_if_name):
- raise Exception("Source interface name equals destination interface name")
-
-src_if = Interface(src_if_name)
-src_if.send_pkt(create_gratuitous_arp_request(src_mac, src_ip))
-if dst_if_defined:
- dst_if = Interface(dst_if_name)
- dst_if.send_pkt(create_gratuitous_arp_request(dst_mac, dst_ip))
-
-pkt_req_send = auto_pad(Ether(src=src_mac, dst=first_hop_mac) /
- IP(src=src_ip, dst=dst_ip) /
- ICMP())
-pkt_req_send = Ether(pkt_req_send)
-src_if.send_pkt(pkt_req_send)
-
-if dst_if_defined:
- try:
+ pkt_recv.show2()
+ raise RuntimeError("Sent packet doesn't match received packet")
+
+
+def main():
+ args = TrafficScriptArg(['src_mac', 'dst_mac', 'src_ip', 'dst_ip',
+ 'hops', 'first_hop_mac', 'is_dst_tg'])
+
+ src_if_name = args.get_arg('tx_if')
+ dst_if_name = args.get_arg('rx_if')
+ is_dst_tg = True if args.get_arg('is_dst_tg') == 'True' else False
+
+ src_mac = args.get_arg('src_mac')
+ first_hop_mac = args.get_arg('first_hop_mac')
+ dst_mac = args.get_arg('dst_mac')
+ src_ip = args.get_arg('src_ip')
+ dst_ip = args.get_arg('dst_ip')
+ hops = int(args.get_arg('hops'))
+
+ if is_dst_tg and (src_if_name == dst_if_name):
+ raise RuntimeError(
+ "Source interface name equals destination interface name")
+
+ src_if = Interface(src_if_name)
+ src_if.send_pkt(str(create_gratuitous_arp_request(src_mac, src_ip)))
+ if is_dst_tg:
+ dst_if = Interface(dst_if_name)
+ dst_if.send_pkt(str(create_gratuitous_arp_request(dst_mac, dst_ip)))
+
+ pkt_req_send = (Ether(src=src_mac, dst=first_hop_mac) /
+ IP(src=src_ip, dst=dst_ip) /
+ ICMP())
+ src_if.send_pkt(pkt_req_send)
+
+ if is_dst_tg:
pkt_req_recv = dst_if.recv_pkt()
- except:
- src_if.close()
- if dst_if_defined:
- dst_if.close()
- raise
+ if pkt_req_recv is None:
+ raise RuntimeError('Timeout waiting for packet')
- check_ttl(pkt_req_send[IP].ttl, pkt_req_recv[IP].ttl, hops)
- pkt_req_send_mod = pkt_req_send.copy()
- pkt_req_send_mod[IP].ttl = pkt_req_recv[IP].ttl
- del pkt_req_send_mod[IP].chksum # update checksum
- ckeck_packets_equal(pkt_req_send_mod[IP], pkt_req_recv[IP])
+ check_ttl(pkt_req_send[IP].ttl, pkt_req_recv[IP].ttl, hops)
+ pkt_req_send_mod = pkt_req_send.copy()
+ pkt_req_send_mod[IP].ttl = pkt_req_recv[IP].ttl
+ del pkt_req_send_mod[IP].chksum # update checksum
+ ckeck_packets_equal(pkt_req_send_mod[IP], pkt_req_recv[IP])
- pkt_resp_send = auto_pad(Ether(src=dst_mac, dst=pkt_req_recv.src) /
- IP(src=dst_ip, dst=src_ip) /
- ICMP(type=0)) # echo-reply
- pkt_resp_send = Ether(pkt_resp_send)
- dst_if.send_pkt(pkt_resp_send)
+ pkt_resp_send = (Ether(src=dst_mac, dst=pkt_req_recv.src) /
+ IP(src=dst_ip, dst=src_ip) /
+ ICMP(type=0)) # echo-reply
+ dst_if.send_pkt(pkt_resp_send)
-try:
pkt_resp_recv = src_if.recv_pkt()
-except:
- src_if.close()
- if dst_if_defined:
- dst_if.close()
- raise
-
-if dst_if_defined:
- check_ttl(pkt_resp_send[IP].ttl, pkt_resp_recv[IP].ttl, hops)
- pkt_resp_send_mod = pkt_resp_send.copy()
- pkt_resp_send_mod[IP].ttl = pkt_resp_recv[IP].ttl
- del pkt_resp_send_mod[IP].chksum # update checksum
- ckeck_packets_equal(pkt_resp_send_mod[IP], pkt_resp_recv[IP])
-
-src_if.close()
-if dst_if_defined:
- dst_if.close()
+ if pkt_resp_recv is None:
+ raise RuntimeError('Timeout waiting for packet')
+
+ if is_dst_tg:
+ check_ttl(pkt_resp_send[IP].ttl, pkt_resp_recv[IP].ttl, hops)
+ pkt_resp_send_mod = pkt_resp_send.copy()
+ pkt_resp_send_mod[IP].ttl = pkt_resp_recv[IP].ttl
+ del pkt_resp_send_mod[IP].chksum # update checksum
+ ckeck_packets_equal(pkt_resp_send_mod[IP], pkt_resp_recv[IP])
+
+ if not pkt_resp_recv.haslayer(IP):
+ raise RuntimeError('Received packet does not contain IPv4 header: {}'.
+ format(pkt_resp_recv.__repr__()))
+
+ if pkt_resp_recv[IP].src != pkt_req_send[IP].dst:
+ raise RuntimeError(
+ 'Received IPv4 packet contains wrong src IP address, '
+ '{} instead of {}'.format(pkt_resp_recv[IP].src,
+ pkt_req_send[IP].dst))
+
+ if pkt_resp_recv[IP].dst != pkt_req_send[IP].src:
+ raise RuntimeError(
+ 'Received IPv4 packet contains wrong dst IP address, '
+ '{} instead of {}'.format(pkt_resp_recv[IP].dst,
+ pkt_req_send[IP].src))
+
+ # verify IPv4 checksum
+ copy = pkt_resp_recv.copy()
+ chksum = copy[IP].chksum
+ del copy[IP].chksum
+ tmp = IP(str(copy[IP]))
+ if not checksum_equal(tmp.chksum, chksum):
+ raise RuntimeError('Received IPv4 packet contains invalid checksum, '
+ '{} instead of {}'.format(chksum, tmp.chksum))
+
+ if not pkt_resp_recv[IP].haslayer(ICMP):
+ raise RuntimeError(
+ 'Received IPv4 packet does not contain ICMP header: {}'.
+ format(pkt_resp_recv[IP].__repr__()))
+
+ # verify ICMP checksum
+ copy = pkt_resp_recv.copy()
+ chksum = copy[IP][ICMP].chksum
+ del copy[IP][ICMP].chksum
+ tmp = ICMP(str(copy[IP][ICMP]))
+ if not checksum_equal(tmp.chksum, chksum):
+ raise RuntimeError('Received ICMP packet contains invalid checksum, '
+ '{} instead of {}'.format(chksum, tmp.chksum))
+
+ pkt_req_send_mod = pkt_req_send.copy()
+ pkt_req_send_mod[IP][ICMP].type = pkt_resp_recv[IP][ICMP].type
+ del pkt_req_send_mod[IP][ICMP].chksum # update checksum
+ ckeck_packets_equal(pkt_req_send_mod[IP][ICMP], pkt_resp_recv[IP][ICMP])
+
+
+if __name__ == "__main__":
+ main()
Code Review / csit.git / blobdiff