nfnl_osf (8) Linux Manual Page
nfnl_osf – OS fingerprint loader utility
Synopsis
nfnl_osf -f fingerprints [ -d ]
Description
The nfnl_osf utility allows to load a set of operating system signatures into the kernel for later matching against using iptables’ osf match.
Options
- -f fingerprints
- Read signatures from file fingerprints.
- -d
- Instead of adding the signatures from fingerprints into the kernel, remove them.
Exit Status
Exit status is 0 if command succeeded, otherwise a negative return code indicates the type of error which happened:
- -1
- Illegal arguments passed, fingerprints file not readable or failure in netlink communication.
- -ENOENT
- Fingerprints file not specified.
- -EINVAL
- Netlink handle initialization failed or fingerprints file format invalid.
Files
An up to date set of operating system signatures can be downloaded from http://www.openbsd.org/cgi-bin/cvsweb/src/etc/pf.os .
See Also
The description of osf match in iptables-extensions(8) contains further information about the topic as well as example nfnl_osf invocations.