Signed-off-by: Jan Engelhardt <jengelh@xxxxxxxxxx>
---
extensions/libxt_osf.c | 4 ++--
extensions/libxt_osf.man | 45 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+), 2 deletions(-)
create mode 100644 extensions/libxt_osf.man
diff --git a/extensions/libxt_osf.c b/extensions/libxt_osf.c
index 3c0ea2d..07b86e4 100644
--- a/extensions/libxt_osf.c
+++ b/extensions/libxt_osf.c
@@ -40,8 +40,8 @@
static void osf_help(void)
{
printf("OS fingerprint match options:\n"
- "--genre [!] string Match a OS genre by passive fingerprinting.\n"
- "--ttl Use some TTL check extensions to determine OS:\n"
+ "[!] --genre string Match a OS genre by passive fingerprinting.\n"
+ "--ttl level Use some TTL check extensions to determine OS:\n"
" 0 true ip and fingerprint TTL comparison. Works for LAN.\n"
" 1 check if ip TTL is less than fingerprint one. Works for global addresses.\n"
" 2 do not compare TTL at all. Allows to detect NMAP, but can produce false results.\n"
diff --git a/extensions/libxt_osf.man b/extensions/libxt_osf.man
new file mode 100644
index 0000000..ea616a9
--- /dev/null
+++ b/extensions/libxt_osf.man
@@ -0,0 +1,45 @@
+The osf module does passive operating system fingerprinting. This modules
+compares some data (Window Size, MSS, options and their order, TTL, DF,
+and others) from packets with the SYN bit set.
+.TP
+[\fB!\fP] \fB\-\-genre\fP \fIstring\fP
+Match an operating system genre by using a passive fingerprinting.
+.TP
+\fB\-\-ttl\fP \fIlevel\fP
+Do additional TTL checks on the packet to determine the operating system.
+\fIlevel\fP can be one of the following values:
+.IP \(bu 4
+0 - True IP address and fingerprint TTL comparison. This generally works for
+LANs.
+.IP \(bu 4
+1 - Check if the IP header's TTL is less than the fingerprint one. Works for
+globally-routable addresses.
+.IP \(bu 4
+2 - Do not compare the TTL at all.
+.TP
+\fB\-\-log\fP \fIlevel\fP
+Log determined genres into dmesg even if they do not match the desired one.
+\fIlevel\fP can be one of the following values:
+.IP \(bu 4
+0 - Log all matched or unknown signatures
+.IP \(bu 4
+1 - Log only the first one
+.IP \(bu 4
+2 - Log all known matched signatures
+.PP
+You may find something like this in syslog:
+.PP
+Windows [2000:SP3:Windows XP Pro SP1, 2000 SP3]: 11.22.33.55:4024 ->
+11.22.33.44:139 hops=3 Linux [2.5-2.6:] : 1.2.3.4:42624 -> 1.2.3.5:22 hops=4
+.PP
+OS fingerprints are loadable using the \fBnfnl_osf\fP program. To load
+fingerprints from a file, use:
+.PP
+\fBnfnl_osf -f ./pf.os\fP
+.PP
+To remove them again,
+.PP
+\fBnfnl_osf -f ./pf.os -d\fP
+.PP
+The fingerprint database can be downlaoded from
+http://www.openbsd.org/cgi-bin/cvsweb/src/etc/pf.os .
--
1.7.0.2
--
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