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26 changes: 13 additions & 13 deletions pinject.py
Original file line numberDiff line numberDiff line change
Expand Up@@ -19,7 +19,7 @@ def checksum(data):
s = (s & 0xFFFF) + (s >> 16)
s = ~s & 0xffff
return s

class layer():
pass

Expand DownExpand Up@@ -74,7 +74,7 @@ def pack(self):
self.protocol,
socket.htons(self.checksum),
self.source,
self.destination)
self.destination)
return ip_header
def unpack(self, packet):
_ip = layer()
Expand DownExpand Up@@ -104,7 +104,7 @@ def unpack(self, packet):
_ip.src,
_ip.dst]
return _ip

class TCP(object):
def __init__(self, srcp, dstp):
self.srcp = srcp
Expand All@@ -126,13 +126,13 @@ def __init__(self, srcp, dstp):
def pack(self, source, destination):
data_offset = (self.offset << 4) + 0
flags = self.fin + (self.syn << 1) + (self.rst << 2) + (self.psh << 3) + (self.ack << 4) + (self.urg << 5)
tcp_header = struct.pack('!HHLLBBHHH',
self.srcp,
self.dstp,
self.seqn,
self.ackn,
data_offset,
flags,
tcp_header = struct.pack('!HHLLBBHHH',
self.srcp,
self.dstp,
self.seqn,
self.ackn,
data_offset,
flags,
self.window,
self.checksum,
self.urgp)
Expand DownExpand Up@@ -209,7 +209,7 @@ def __init__(self, src, dst, payload=''):
def pack(self, src, dst, proto=socket.IPPROTO_UDP):
length = self.length + len(self.payload)
pseudo_header = struct.pack('!4s4sBBH',
socket.inet_aton(src), socket.inet_aton(dst), 0,
socket.inet_aton(src), socket.inet_aton(dst), 0,
proto, length)
self.checksum = checksum(pseudo_header)
packet = struct.pack('!HHHH',
Expand DownExpand Up@@ -247,8 +247,8 @@ def main():
ip = ipobj.unpack(response)
response = response[ip.ihl:]
tcp = tcpobj.unpack(response)
print"IP Header:", ip.list
print"TCP Header:", tcp.list
print("IP Header:", ip.list)
print("TCP Header:", tcp.list)

if __name__=="__main__":
main()