3 files changed, 72 insertions, 0 deletions
diff --git a/utils/.gitignore b/utils/.gitignore
index 216d1e4a..7c6afbf4 100644
--- a/utils/.gitignore
+++ b/utils/.gitignore
@@ -1,2 +1,3 @@
 /nfnl_osf
+/nfnl_osf.8
 /nfbpf_compile
diff --git a/utils/Makefile.am b/utils/Makefile.am
index c4192a9e..80029e30 100644
--- a/utils/Makefile.am
+++ b/utils/Makefile.am
@@ -6,8 +6,10 @@ AM_CPPFLAGS = ${regular_CPPFLAGS} -I${top_builddir}/include \
 
 sbin_PROGRAMS =
 pkgdata_DATA =
+man_MANS =
 
 if HAVE_LIBNFNETLINK
+man_MANS += nfnl_osf.8
 sbin_PROGRAMS += nfnl_osf
 pkgdata_DATA += pf.os
 
@@ -23,3 +25,5 @@ if ENABLE_SYNCONF
 sbin_PROGRAMS += nfsynproxy
 nfsynproxy_LDADD = -lpcap
 endif
+
+CLEANFILES = nfnl_osf.8
diff --git a/utils/nfnl_osf.8.in b/utils/nfnl_osf.8.in
new file mode 100644
index 00000000..140b5c3f
--- /dev/null
+++ b/utils/nfnl_osf.8.in
@@ -0,0 +1,67 @@
+.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.