def mainloop(self):
while True:
self.kernel32.WaitForSingleObject(self.hEvent, 10)
while self.ndisapi.ReadPacket(self.hnd, byref(self.request)):
d = bytes(self.packetbuffer.m_IBuffer[:self.packetbuffer.m_Length])
if self.checkfortcp(d) and self.checkforips(d):
self.qi.put_nowait(ip_stack.parse(d))
else:
self.send(self.request)
while not self.qo.empty():
self.sendpack(self.qo.get())
self.kernel32.ResetEvent(self.hEvent)
def mainloop(self):
while True:
self.kernel32.WaitForSingleObject(self.hEvent, 10)
while self.ndisapi.ReadPacket(self.hnd, byref(self.request)):
d = bytes(
self.packetbuffer.m_IBuffer[:self.packetbuffer.m_Length])
if self.checkfortcp(d) and self.checkforips(d):
self.qi.put_nowait(ip_stack.parse(d))
else:
self.send(self.request)
while not self.qo.empty():
self.sendpack(self.qo.get())
self.kernel32.ResetEvent(self.hEvent)
def TCPchecksum(ip):
tcp = ip.next
tcp.header.checksum = 0
pshbin = psh.build(
Container(src=ip.header.source,
dst=ip.header.destination,
protocol=ip.header.protocol,
tcplen=ip.header.total_length - ip.header.header_length))
tcp.header.checksum = checksum(pshbin + tcp_header.build(tcp.header) +
tcp.next)
def recalculatechecksums(ip):
IPchecksum(ip)
TCPchecksum(ip)
if __name__ == "__main__":
from ipstack import ip_stack
b = bytes.fromhex(
"00093bf01a40000a3bf016700800450002402e04000073061da86da7825b0a00000a172b0a76a8977e87d64c993e5010010050c500001732f7468a6ae4c9b605ec06886de7f3b7d734871748b54ec89b4f4cde5f307e2a75a687c42aa7eb61bd8ea953bb5c9311cedcf453323d3176f02d650d0c9db0291cadcf8fa6b623eee2bd64ea6c43aa24c00c6c0d5d7bbaeb8a195aca5c0cfb915897f1a57c8cabfb345ad0fbbd67a26252475982437b6e19221f09a763c3a29eabc2c892036be579db677dd0409e6b207e39cd26c2757b2295946dae0e6f4c7f7cca729e44eddd46b4d3494db325f1ca4c2aa88cc437e8d1007a0c9386738684fba5a0416611a17c81e23d8e6ebfceececf1d4b4be12e17802b4813335c27ad5f0ec5051320032c95a516f2ecef6abdab09f68d586ebb8b2a6d009bdc589b84d6e43c79fb263bf4860e1b2af27c47e51fd3abc2d851417bcccf39d844087b257fed67c211013da14398528bfce29f72a485d7409742a0c822a85f952e25e1e290fa80d53cba749b94f7a8e46ea8a71e3c727bfef0f2be2ec13abe265eb47af3514d54e5da1dfb5bc6a8252bbf4620b8febad6b57332e5fbbbe406d3b4ebedd5b92ef8aaff80f55f98832a0dc207b7993fe9c550440ccfc4fa78aff575e63a6861dd99e9f603c7a37fe82cfa35b8adae194bffa42f3e63d890fc3099df1adf620d3ff869ce4a99caa54e27c54aa26ec5b537f5b00478363535e18d95f40439a24e164548305fe244cca6b24f53a189743a62fec07ba10ed4986fd20f8a6920218f1667523c4f509b78859fa350b83a684db8e596e0b1c68"
)
eth = ip_stack.parse(b)
ip = eth.next
print("default checksums: ip = {:x}, tcp = {:x}".format(
ip.header.checksum, ip.next.header.checksum))
recalculatechecksums(ip)
print("recalculated checksums: ip = {:x}, tcp = {:x}".format(
ip.header.checksum, ip.next.header.checksum))
psh = Struct(None,
IpAddress("src"),
IpAddress("dst"),
ProtocolEnum(UBInt16("protocol")),
UBInt16("tcplen")
)
def TCPchecksum(ip):
tcp = ip.next
tcp.header.checksum = 0
pshbin = psh.build(Container(
src = ip.header.source,
dst = ip.header.destination,
protocol = ip.header.protocol,
tcplen = ip.header.total_length - ip.header.header_length)
)
tcp.header.checksum = checksum(pshbin + tcp_header.build(tcp.header) + tcp.next)
def recalculatechecksums(ip):
IPchecksum(ip)
TCPchecksum(ip)
if __name__ == "__main__":
from ipstack import ip_stack
b = bytes.fromhex("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")
eth = ip_stack.parse(b)
ip = eth.next
print("default checksums: ip = {:x}, tcp = {:x}".format(ip.header.checksum, ip.next.header.checksum))
recalculatechecksums(ip)
print("recalculated checksums: ip = {:x}, tcp = {:x}".format(ip.header.checksum, ip.next.header.checksum))
