我最近一直在为原始数据包开发一个程序。我们最近有一个关于原始数据包的讲座,所以我一直在努力学习并完全按照我的教授告诉我的去做。我的程序有问题,它出现一个错误,说需要目标地址,它是原始的,所以我不想做 socket.connect(destaddr) ,即使这会修复错误。这是我的代码:这是类和函数:
#not real mac address to protect privacy also removed preamble
class packet(object):
b = ""
def __init__(self, payload):
self.payload = payload
def ether(self):
#preamble = "55555555555555D5"
macdest = "123456789101" #my mac address - needed to remove colons
macsource = "123456789101" #router mac address without colons
ethertype = "0800" #removed 0x because it is not needed
fcs = "" #frame check sequence none so far
frame = macdest+macsource+ethertype
return frame
def ip(self): #in hexadecimal
version = "4" #ipv4 hex
ihl = "5" #header length hex
dscp = "00" #default
ecn = "00" #default
length = "36" #ether-24 + ip-20 + tcp-30 = 54 to hexa = 35
idip="0000" #random id
flags = "40" #dont fragment flag is 2 to hex is 4
offset = "00" #space taker
ttl = "40"#hex(64) = 40
protocol = "06" #for tcp
checksum = "0000"
ipaddrfrom = "c0a8010a"
ipaddrto = "c0a80101"
datagram = version+ihl+dscp+ecn+length+idip+flags+offset+ttl+protocol+checksum+ipaddrfrom+ipaddrto
return datagram
def tcp(self):
portsrc = "15c0" #5568
portdest = "0050" #80
syn = "00000000"
ack = "00000000"
nonce = "80"
fin = "10"
windowscale = "813b"
checksum = "0000"
segment = portsrc+portdest+syn+ack+nonce+fin+windowscale + checksum
return segment
def getpacket(self):
frame = self.ether()
datagram = self.ip()
segment = self.tcp()
payload = self.payload
packet = frame+datagram+segment+payload
a = 0
b = ""
for char in packet:
a = a+1
b = b + char
if a == 4:
b = b + " "
a=0
self.fmtpacket = b
return packet
def raw():
s = socket(AF_INET, SOCK_RAW, IPPROTO_IP)
s.bind(('192.168.1.10', 0))
pckt = packet("")
netpacket = pckt.getpacket()
print "Sending: " + pckt.fmtpacket
print ""
s.sendall(netpacket)
data = s.recv(4096)
print data