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<h3>
Eric S. Raymond pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/743dd381b92a6193198ebd54ba483e2bb753f75b">743dd381</a></strong>
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<span>by Eric S. Raymond</span>
<i>at 2016-08-29T16:02:43-04:00</i>
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<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Added section on async DNS to the tour document.
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<h4>2 changed files:</h4>
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devel/hacking.txt
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devel/tour.txt
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<h4>Changes:</h4>
<li id="diff-0">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/743dd381b92a6193198ebd54ba483e2bb753f75b#diff-0"><strong>devel/hacking.txt</strong></a>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -12,6 +12,9 @@ documented here.</td>
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<pre style="margin: 0"> <span id="LC12" class="line"></span>
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<pre style="margin: 0"> <span id="LC13" class="line">== General notes ==</span>
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<pre style="margin: 0"> <span id="LC14" class="line"></span>
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<pre style="margin: 0"> <span id="LC15" class="line">If you want to learn more about the code internals, find tour.txt.</span>
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<pre style="margin: 0"> <span id="LC16" class="line">This document is about development practices and project conventions.</span>
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<pre style="margin: 0"> <span id="LC17" class="line"></span>
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<pre style="margin: 0"> <span id="LC18" class="line">=== Build system ===</span>
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<pre style="margin: 0"> <span id="LC19" class="line"></span>
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<pre style="margin: 0"> <span id="LC20" class="line">The build uses waf, replacing a huge ancient autoconf hairball that</span>
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<a href="https://gitlab.com/NTPsec/ntpsec/commit/743dd381b92a6193198ebd54ba483e2bb753f75b#diff-1"><strong>devel/tour.txt</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="170" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -170,4 +170,50 @@ when a specific event occurs on a file descriptor or after a timeout</td>
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<pre style="margin: 0"> <span id="LC170" class="line">has been reached. Other NTP programs, notably ntpd and ntpq, could</span>
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<pre style="margin: 0"> <span id="LC171" class="line">use it, but would require serious rewrites to do so.</span>
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<pre style="margin: 0"> <span id="LC172" class="line"></span>
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<pre style="margin: 0"> <span id="LC173" class="line">== Asynchronous DNS lookup ==</span>
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<pre style="margin: 0"> <span id="LC174" class="line"></span>
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<pre style="margin: 0"> <span id="LC175" class="line">There are great many complications in the code that arise from wanting</span>
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<pre style="margin: 0"> <span id="LC176" class="line">to avoid stalling the main loop while it waits for a DNS lookup to</span>
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<pre style="margin: 0"> <span id="LC177" class="line">return. And DNS lookups can take a *long* time. Hal Murray notes that</span>
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<pre style="margin: 0"> <span id="LC178" class="line">he thinks he's seen 40 seconds on a failing case.</span>
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<pre style="margin: 0"> <span id="LC179" class="line"></span>
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<pre style="margin: 0"> <span id="LC180" class="line">One reason for the complications is that the async-DNS support seems</span>
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<pre style="margin: 0"> <span id="LC181" class="line">somewhat overengineered. Whoever built it was thinking in terms of a</span>
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182
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<pre style="margin: 0"> <span id="LC182" class="line">general async-worker facility and implemented things that this use</span>
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183
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<pre style="margin: 0"> <span id="LC183" class="line">of it probably doesn't need - notably an input-buffer pool.</span>
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184
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<pre style="margin: 0"> <span id="LC184" class="line"></span>
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185
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<pre style="margin: 0"> <span id="LC185" class="line">This code is a candidate to be replaced by an async-DNS library such</span>
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186
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<pre style="margin: 0"> <span id="LC186" class="line">as cAres. One attempt at this has been made, but abandoned because</span>
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187
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<pre style="margin: 0"> <span id="LC187" class="line">the async-worker interface to the rest of the code is pretty gnarly.</span>
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188
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<pre style="margin: 0"> <span id="LC188" class="line"></span>
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189
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<pre style="margin: 0"> <span id="LC189" class="line">The DNS lookups during initialization - of hostnames specified on the</span>
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190
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<pre style="margin: 0"> <span id="LC190" class="line">coomand line of ntp.conf - could be done synchronously. But there are</span>
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<pre style="margin: 0"> <span id="LC191" class="line">two cases we know of where ntpd has to do a DNS lookup after its</span>
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192
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<pre style="margin: 0"> <span id="LC192" class="line">main loop gets started.</span>
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193
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<pre style="margin: 0"> <span id="LC193" class="line"></span>
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194
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<pre style="margin: 0"> <span id="LC194" class="line">One is the try again when DNS for the normal server case doesn't work during</span>
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195
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<pre style="margin: 0"> <span id="LC195" class="line">initialization. It will try again occasionally until it gets an answer.</span>
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196
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<pre style="margin: 0"> <span id="LC196" class="line">(which might be negative)</span>
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197
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<pre style="margin: 0"> <span id="LC197" class="line"></span>
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<pre style="margin: 0"> <span id="LC198" class="line">The main one is the pool code trying for a new server. There are</span>
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199
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<pre style="margin: 0"> <span id="LC199" class="line">several possible extensions in this area. The main one would be to verify that</span>
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200
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<pre style="margin: 0"> <span id="LC200" class="line">a server you are using is still in the pool. (There isn't a way to do</span>
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201
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<pre style="margin: 0"> <span id="LC201" class="line">that yet - the pool doesn't have any DNS support for that.) The other</span>
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202
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<pre style="margin: 0"> <span id="LC202" class="line">would be to try replacing the poorest server rather than only</span>
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203
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<pre style="margin: 0"> <span id="LC203" class="line">replacing dead servers.</span>
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<pre style="margin: 0"> <span id="LC204" class="line"></span>
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<td class="diff-line-num new new_line" data-linenumber="205" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0"> <span id="LC205" class="line">As long as we get packet receive timestamps from the OS, synchronous</span>
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<td class="diff-line-num new new_line" data-linenumber="206" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0"> <span id="LC206" class="line">DNS delays probably won't introduce any lies on the normal path. We</span>
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<td class="diff-line-num new new_line" data-linenumber="207" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0"> <span id="LC207" class="line">could test that by putting a sleep in the main loop. (There is a</span>
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<td class="diff-line-num new new_line" data-linenumber="208" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0"> <span id="LC208" class="line">filter to reject packets that take too long, but Hal thinks that's</span>
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<pre style="margin: 0"> <span id="LC209" class="line">time-in-flight and excludes time sitting on the server.)</span>
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<pre style="margin: 0"> <span id="LC210" class="line"></span>
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<pre style="margin: 0"> <span id="LC211" class="line">There are two known cases where a pause in ntpd would cause troubles.</span>
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<pre style="margin: 0"> <span id="LC212" class="line">One is that it would mess up refclocks. The other is that packets</span>
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<pre style="margin: 0"> <span id="LC213" class="line">will get dropped if too many of them arrive during the stall.</span>
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<pre style="margin: 0"> <span id="LC214" class="line"></span>
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<pre style="margin: 0"> <span id="LC215" class="line">This probably means we could go synchronous-only and use the pool</span>
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<pre style="margin: 0"> <span id="LC216" class="line">command on a system without refclocks. That covers end nodes and</span>
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<pre style="margin: 0"> <span id="LC217" class="line">maybe lightly loaded servers.</span>
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<pre style="margin: 0"> <span id="LC218" class="line"></span>
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173
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<pre style="margin: 0"> <span id="LC219" class="line">// end</span></pre>
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