def replay():
packet = IP(dst="127.0.0.1", chksum=0) / UDP(
dport=1812, sport=RandShort(), chksum=0)
for payload in extract_payload(product_path):
packet[UDP].payload = payload
del packet[IP].chksum
del packet[UDP].chksum
packet.show2()
send(packet, iface="lo0")
time.sleep(1)
def postcondition(packet):
from scapy.all import IP
pkt = IP(packet.get_payload())
if pkt.haslayer('IP'):
del pkt['IP'].chksum
del pkt['IP'].len
if pkt.haslayer('TCP'):
del pkt['TCP'].chksum
if pkt.haslayer('ICMP'):
del pkt['ICMP'].chksum
pkt.show2()
packet.raw = bytes(pkt)
return packet
def tryInterfaces(self, ifaces):
try:
from scapy.all import sr1 ## we want this check to be blocking
except:
log.msg("This test requires scapy: www.secdev.org/projects/scapy")
raise SystemExit
ifup = {}
while ifaces:
for ifname, ifaddr in ifaces:
log.debug("Currently testing network capabilities of interface"
+ "%s by sending a packet to our address %s"
% (ifname, ifaddr))
try:
pkt = IP(dst=ifaddr)/ICMP()
ans, unans = sr(pkt, iface=ifname, timeout=self.timeout)
except Exception, e:
raise PermissionsError if e.find("Errno 1") else log.err(e)
else:
## xxx i think this logic might be wrong
log.debug("Interface test packet\n%s\n\n%s"
% (pkt.summary(), pkt.show2()))
if ans.summary():
log.info("Received answer for test packet on interface"
+"%s :\n%s" % (ifname, ans.summary()))
ifup.update(ifname, ifaddr)
else:
log.info("Our interface test packet was unanswered:\n%s"
% unans.summary())
def main():
if len(sys.argv) < 3:
print('Usage: ./send.py <src_ip> <dst_ip>')
exit(1)
src_ip = sys.argv[1]
dst_ip = sys.argv[2]
iface = get_if()
pkt = IP(src=src_ip, dst=dst_ip)
pkt.show2()
try:
while True:
send(pkt, iface=iface)
sleep(1)
except KeyboardInterrupt:
pass
