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.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.
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