CODEWITHSUNDEEP
c++cnetwork-programming
user2601950
user2601950

Reputation: 1

WinDivert Issue

I Have an issue with WinDivert. DivertSend does not work, GetLastError() return 1237 ?

I have a another question. I want to divert traffic based on an IP list, I have a CSV file with more than 20000 records, each record contain an IP range, the problem is I can just call DivertOpen with only 500 record of my CSV file as a filter string. if I call DivertOpen with more than 500 record as filter I got "filter syntax error". How can i fix this issue. Thanks

Upvotes: 0

Views: 1259

Answers (1)

Basil
Basil

Reputation: 1021

WinDivert is not designed to handle long/complicated filter strings (such as a list of 20,000 IP addresses). This is briefly mentioned in the WinDivert documentation: namely, the filter string should ideally be both selective and short, and the more shorter/selective the better.

For your kind of application, where a short string is not possible, you are better off capturing all network traffic (e.g. with a call to DivertOpen("true", ...)) and doing the filtering in the user-mode application using some efficient method (such as binary search). Simply re-inject the packets that do not match.

PS: Thanks for the report of the 1237 error issue.

Upvotes: 1

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