Re-run nmap OS fingerprint match with existing subject fingerprint

Question

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.

Answer 1

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.