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I have a collection of nmap subject fingerprints (described here), but have updated my local (private) reference fingerprint database since they were collected. Is there any existing way to re-match these subject fingerprints against the updated database without requiring a complete new scan? I've searched the nmap source code and haven't found anything yet.

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There is not a public tool to do this, but you can cobble one together pretty easily with a few functions from osscan.cc:

  1. Load the fingerprints from nmap-os-db with parse_fingerprint_file.
  2. Parse the observed fingerprint you want to test with parse_single_fingerprint.
  3. Check for a match with match_fingerprint.
  4. Print the results.

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