767173cec2
Update 4.2.8p14 --> 4.2.8p15 Summary: Systems that use a CMAC algorithm in ntp.keys will not release a bit of memory on each packet that uses a CMAC keyid, eventually causing ntpd to run out of memory and fail. The CMAC cleanup from https://bugs.ntp.org/3447, part of ntp-4.2.8p11, introduced a bug whereby the CMAC data structure was no longer completely removed. MFC after: 3 days Security: NTP Bug 3661
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240 lines
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<title>Ntptrace User’s Manual</title>
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<h1 class="settitle" align="center">Ntptrace User’s Manual</h1>
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<a name="Top"></a>
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<div class="header">
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Previous: <a href="dir.html#Top" accesskey="p" rel="prev">(dir)</a>, Up: <a href="dir.html#Top" accesskey="u" rel="up">(dir)</a> </p>
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</div>
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<a name="Simple-Network-Time-Protocol-User-Manual"></a>
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<h1 class="top">Simple Network Time Protocol User Manual</h1>
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<p>This document describes the use of the NTP Project’s <code>ntptrace</code> program.
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This document applies to version 4.2.8p15 of <code>ntptrace</code>.
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</p>
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<a name="SEC_Overview"></a>
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<h2 class="shortcontents-heading">Short Table of Contents</h2>
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<div class="shortcontents">
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<ul class="no-bullet">
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<li><a name="stoc-Invoking-ntptrace" href="#toc-Invoking-ntptrace">1 Invoking ntptrace</a></li>
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</ul>
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</div>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• ntptrace Description:</td><td> </td><td align="left" valign="top">Description
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntptrace-Invocation" accesskey="2">ntptrace Invocation</a>:</td><td> </td><td align="left" valign="top">Invoking ntptrace
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</td></tr>
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</table>
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<hr>
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<a name="ntptrace-Invocation"></a>
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<div class="header">
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<p>
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Up: <a href="#Top" accesskey="u" rel="up">Top</a> </p>
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</div>
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<a name="Invoking-ntptrace"></a>
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<h2 class="chapter">1 Invoking ntptrace</h2>
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<a name="index-ntptrace"></a>
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<a name="index-Trace-peers-of-an-NTP-server"></a>
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<p><code>ntptrace</code> is a perl script that uses the ntpq utility program to follow
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the chain of NTP servers from a given host back to the primary time source. For
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ntptrace to work properly, each of these servers must implement the NTP Control
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and Monitoring Protocol specified in RFC 1305 and enable NTP Mode 6 packets.
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</p>
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<p>If given no arguments, ntptrace starts with localhost. Here is an example of
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the output from ntptrace:
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</p>
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<div class="example">
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<pre class="example">% ntptrace localhost: stratum 4, offset 0.0019529, synch distance 0.144135
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server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784 usndh.edu:
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stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB'
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</pre></div>
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<p>On each line, the fields are (left to right): the host name, the host stratum,
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the time offset between that host and the local host (as measured by
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<code>ntptrace</code>; this is why it is not always zero for "localhost"), the host
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synchronization distance, and (only for stratum-1 servers) the reference clock
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ID. All times are given in seconds. Note that the stratum is the server hop
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count to the primary source, while the synchronization distance is the
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estimated error relative to the primary source. These terms are precisely
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defined in RFC-1305.
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</p>
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<p>This section was generated by <strong>AutoGen</strong>,
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using the <code>agtexi-cmd</code> template and the option descriptions for the <code>ntptrace</code> program.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="#ntptrace-usage" accesskey="1">ntptrace usage</a>:</td><td> </td><td align="left" valign="top">ntptrace help/usage (<samp>--help</samp>)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntptrace-numeric" accesskey="2">ntptrace numeric</a>:</td><td> </td><td align="left" valign="top">numeric option (-n)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntptrace-max_002dhosts" accesskey="3">ntptrace max-hosts</a>:</td><td> </td><td align="left" valign="top">max-hosts option (-m)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntptrace-host" accesskey="4">ntptrace host</a>:</td><td> </td><td align="left" valign="top">host option (-r)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntptrace-exit-status" accesskey="5">ntptrace exit status</a>:</td><td> </td><td align="left" valign="top">exit status
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</td></tr>
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</table>
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<hr>
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<a name="ntptrace-usage"></a>
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<div class="header">
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<p>
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Next: <a href="#ntptrace-numeric" accesskey="n" rel="next">ntptrace numeric</a>, Up: <a href="#ntptrace-Invocation" accesskey="u" rel="up">ntptrace Invocation</a> </p>
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</div>
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<a name="ntptrace-help_002fusage-_0028_002d_002dhelp_0029"></a>
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<h3 class="section">1.1 ntptrace help/usage (<samp>--help</samp>)</h3>
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<a name="index-ntptrace-help"></a>
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<p>This is the automatically generated usage text for ntptrace.
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</p>
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<p>The text printed is the same whether selected with the <code>help</code> option
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(<samp>--help</samp>) or the <code>more-help</code> option (<samp>--more-help</samp>). <code>more-help</code> will print
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the usage text by passing it through a pager program.
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<code>more-help</code> is disabled on platforms without a working
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<code>fork(2)</code> function. The <code>PAGER</code> environment variable is
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used to select the program, defaulting to <samp>more</samp>. Both will exit
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with a status code of 0.
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</p>
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<div class="example">
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<pre class="example">ntptrace - Trace peers of an NTP server - Ver. 4.2.8p15
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USAGE: ntptrace [ -<flag> [<val>] | --<name>[{=| }<val>] ]... [host]
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-n, --numeric Print IP addresses instead of hostnames
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-m, --max-hosts=num Maximum number of peers to trace
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-r, --host=str Single remote host
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-?, --help Display usage information and exit
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--more-help Pass the extended usage text through a pager
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Options are specified by doubled hyphens and their name or by a single
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hyphen and the flag character.
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</pre></div>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="#ntptrace-numeric" accesskey="1">ntptrace numeric</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntptrace-max_002dhosts" accesskey="2">ntptrace max-hosts</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntptrace-host" accesskey="3">ntptrace host</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntptrace-exit-status" accesskey="4">ntptrace exit status</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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</table>
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<hr>
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<a name="ntptrace-numeric"></a>
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<div class="header">
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<p>
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Next: <a href="#ntptrace-max_002dhosts" accesskey="n" rel="next">ntptrace max-hosts</a>, Previous: <a href="#ntptrace-usage" accesskey="p" rel="prev">ntptrace usage</a>, Up: <a href="#ntptrace-usage" accesskey="u" rel="up">ntptrace usage</a> </p>
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</div>
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<a name="numeric-option-_0028_002dn_0029"></a>
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<h4 class="subsection">1.1.1 numeric option (-n)</h4>
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<a name="index-ntptrace_002dnumeric"></a>
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<p>This is the “print ip addresses instead of hostnames” option.
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Output hosts as dotted-quad numeric format rather than converting to
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the canonical host names.
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</p><hr>
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<a name="ntptrace-max_002dhosts"></a>
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<div class="header">
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<p>
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Next: <a href="#ntptrace-host" accesskey="n" rel="next">ntptrace host</a>, Previous: <a href="#ntptrace-numeric" accesskey="p" rel="prev">ntptrace numeric</a>, Up: <a href="#ntptrace-usage" accesskey="u" rel="up">ntptrace usage</a> </p>
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</div>
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<a name="max_002dhosts-option-_0028_002dm_0029"></a>
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<h4 class="subsection">1.1.2 max-hosts option (-m)</h4>
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<a name="index-ntptrace_002dmax_002dhosts"></a>
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<p>This is the “maximum number of peers to trace” option.
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This option takes a number argument.
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This option has no ‘<samp>doc</samp>’ documentation.
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</p><hr>
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<a name="ntptrace-host"></a>
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<div class="header">
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<p>
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Next: <a href="#ntptrace-exit-status" accesskey="n" rel="next">ntptrace exit status</a>, Previous: <a href="#ntptrace-max_002dhosts" accesskey="p" rel="prev">ntptrace max-hosts</a>, Up: <a href="#ntptrace-usage" accesskey="u" rel="up">ntptrace usage</a> </p>
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</div>
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<a name="host-option-_0028_002dr_0029"></a>
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<h4 class="subsection">1.1.3 host option (-r)</h4>
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<a name="index-ntptrace_002dhost"></a>
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<p>This is the “single remote host” option.
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This option takes a string argument.
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This option has no ‘<samp>doc</samp>’ documentation.
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</p><hr>
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<a name="ntptrace-exit-status"></a>
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<div class="header">
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<p>
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Previous: <a href="#ntptrace-host" accesskey="p" rel="prev">ntptrace host</a>, Up: <a href="#ntptrace-usage" accesskey="u" rel="up">ntptrace usage</a> </p>
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</div>
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<a name="ntptrace-exit-status-1"></a>
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<h4 class="subsection">1.1.4 ntptrace exit status</h4>
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<p>One of the following exit values will be returned:
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</p><dl compact="compact">
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<dt>‘<samp>0 (EXIT_SUCCESS)</samp>’</dt>
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<dd><p>Successful program execution.
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</p></dd>
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<dt>‘<samp>1 (EXIT_FAILURE)</samp>’</dt>
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<dd><p>The operation failed or the command syntax was not valid.
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</p></dd>
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</dl>
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<hr>
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