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Fix issue occurring when multiple DNS Servers are configured #72

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Fix issue occurring when multiple DNS Servers are configured #72

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25 changes: 24 additions & 1 deletion fakenet/diverters/winutil.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
import subprocess

NO_ERROR = 0
ERROR_BUFFER_OVERFLOW = 111

AF_INET = 2
AF_INET6 = 23
Expand Down Expand Up @@ -873,7 +874,29 @@ def get_network_params(self):
OutBufLen = ULONG(sizeof(FIXED_INFO))
FixedInfo = FIXED_INFO()

if not windll.iphlpapi.GetNetworkParams(byref(FixedInfo), byref(OutBufLen)) == NO_ERROR:
ret = windll.iphlpapi.GetNetworkParams(byref(FixedInfo), byref(OutBufLen))

if ERROR_BUFFER_OVERFLOW == ret:
# Not enough space in FixedInfo - there are likely multiple DNS
# servers configured for this system, and the IP_ADDR_STRING
# structures for all but the first will get placed at the end
# of the buffer we pass in. To handle this, first figure out
# how much additional space is needed (the size needed is in
# OutBufLen now.)

AdditionalDataLen = OutBufLen.value - sizeof(FIXED_INFO)

# Make a new ctype struct that accommodates this and try again
NewFixedInfoType = type("FIXED_INFO_PLUS_%d" % AdditionalDataLen, \
(Structure,), \
{"_fields_": FIXED_INFO._fields_ + [("_data", BYTE * AdditionalDataLen)]})

OutBufLen.value = sizeof(NewFixedInfoType)
FixedInfo = NewFixedInfoType()

ret = windll.iphlpapi.GetNetworkParams(byref(FixedInfo), byref(OutBufLen))

if not ret == NO_ERROR:
self.logger.error('Failed calling GetNetworkParams')
return None

Expand Down