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Change the output label "Uptime" to "Uptime guess" and print it only in verbose

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david
2008-08-26 17:40:19 +00:00
parent dc74809a68
commit 0a64626a4c
3 changed files with 18 additions and 6 deletions
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17
docs/refguide.xml
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@@ -108,7 +108,6 @@ PORT STATE SERVICE VERSION
Device type: general purpose
Running: Linux 2.4.X|2.5.X|2.6.X
OS details: Linux 2.4.7 - 2.6.11, Linux 2.6.0 - 2.6.11
Uptime 33.908 days (since Thu Jul 21 03:38:03 2005)
Interesting ports on playground.nmap.org (192.168.0.40):
(The 1659 ports scanned but not shown below are in state: closed)
@@ -1872,10 +1871,9 @@ way.</para>
contribute to the pool of operating systems known to Nmap and thus
it will be more accurate for everyone.</para>
<para>OS detection enables several other tests which make use
of information that is gathered during the process anyway. One of these
is uptime measurement, which uses the TCP timestamp option (<ulink role="hidepdf" url="http://www.rfc-editor.org/rfc/rfc1323.txt">RFC 1323</ulink>) to guess when a machine was last rebooted. This is only
reported for machines which provide this information. Another is
<para>OS detection enables some other tests which make use
of information that is gathered during the process anyway.
One of these is
TCP Sequence Predictability Classification. This measures
approximately how hard it is to establish a forged
TCP connection against the remote host. It is useful for
@@ -1894,6 +1892,15 @@ way.</para>
vulnerable to several advanced information gathering and
spoofing attacks.</para>
<indexterm><primary>uptime guess</primary></indexterm>
<para>
Another bit of extra information enabled by OS detection is a guess
at a target's uptime. This uses the TCP timestamp option (<ulink role="hidepdf" url="http://www.rfc-editor.org/rfc/rfc1323.txt">RFC 1323</ulink>) to guess when a machine was last rebooted.
The guess can be inaccurate due to the timestamp counter not being
initialized to zero or the counter overflowing and wrapping around,
so it is printed only in verbose mode.
</para>
<para>
<man>
A paper documenting the workings, usage, and customization of OS