.TH NFNL_OSF 8 "" "@PACKAGE_STRING@" "@PACKAGE_STRING@"

.SH NAME

nfnl_osf \- OS fingerprint loader utility

.SH SYNOPSIS

.ad l

.in +8

.ti -8

.B nfnl_osf

.BI -f " fingerprints"

[

.B -d

]

.SH DESCRIPTION

The

.B nfnl_osf

utility allows to load a set of operating system signatures into the kernel for

later matching against using iptables'

.B osf

match.

.SH OPTIONS

.TP

.BI -f " fingerprints"

Read signatures from file

.IR fingerprints .

.TP

.B -d

Instead of adding the signatures from

.I fingerprints

into the kernel, remove them.

.SH EXIT STATUS

Exit status is 0 if command succeeded, otherwise a negative return code

indicates the type of error which happened:

.TP

.B -1

Illegal arguments passed, fingerprints file not readable or failure in netlink

communication.

.TP

.B -ENOENT

Fingerprints file not specified.

.TP

.B -EINVAL

Netlink handle initialization failed or fingerprints file format invalid.

.SH 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 .

.SH SEE ALSO

The description of

.B osf

match in

.BR iptables-extensions (8)

contains further information about the topic as well as example

.B nfnl_osf

invocations.