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SCTP Part #1

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Ian Gulliver
2019-04-21 17:26:31 +00:00
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<p>htmhtmll<!--# set var="title" value="SCTP Part #1" -->
<!--# set var="date" value="February 26, 2006" --></p>
<!--# include file="include/top.html" -->
<p>I’ve been doing some work with SCTP lately. I’m working through some of the intricacies of the protocol and the brain damage of the APIs (there are two of them, and they both suck). As I write my own API, I thought I’d post a few things here showing, from examples, the nifty stuff that the protocol does. Here’s the first, dealing with message length preservation:</p>
<pre><code>MSG_EOR = 128
</code></pre>
<p>IPV6/TCP:</p>
<pre><code>send("ABCDEFGH", 8) = 8
send("01234567", 8) = 8
recv(16, MSG_DONTWAIT) = 16
recv(16, MSG_DONTWAIT) = -1
========
send("ABCDEFGH", 8) = 8
send("01234567", 8) = 8
recvmsg(5, MSG_DONTWAIT) = 5
-----&gt; msg_flags = 0
recvmsg(11, MSG_DONTWAIT) = 11
-----&gt; msg_flags = 0
recvmsg(11, MSG_DONTWAIT) = -1
-----&gt; msg_flags = 0
</code></pre>
<p>IPV6/SCTP:</p>
<pre><code>send("ABCDEFGH", 8) = 8
send("01234567", 8) = 8
recv(16, MSG_DONTWAIT) = 8
recv(16, MSG_DONTWAIT) = 8
========
send("ABCDEFGH", 8) = 8
send("01234567", 8) = 8
recvmsg(5, MSG_DONTWAIT) = 5
-----&gt; msg_flags = 0
recvmsg(11, MSG_DONTWAIT) = 3
-----&gt; msg_flags = 128
recvmsg(11, MSG_DONTWAIT) = 8
-----&gt; msg_flags = 128
</code></pre>
<!--# include file="include/bottom.html" -->

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index.html
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<li>2010-Mar-26: <a href="2010-03-26-fun-with-map-visualizations.html">Fun with map visualizations</a></li> <li>2010-Mar-26: <a href="2010-03-26-fun-with-map-visualizations.html">Fun with map visualizations</a></li>
<li>2010-Mar-09: <a href="2010-03-09-karaoke-project.html">Karaoke project</a></li> <li>2010-Mar-09: <a href="2010-03-09-karaoke-project.html">Karaoke project</a></li>
<li>2009-Sep-11: <a href="2009-09-11-confusing-bind-with-cnames.html">Confusing BIND with CNAMEs</a></li> <li>2009-Sep-11: <a href="2009-09-11-confusing-bind-with-cnames.html">Confusing BIND with CNAMEs</a></li>
<li>2009-Feb-26: <a href="2006-02-26-sctp-part-1.html">SCTP Part #1</a></li>
<li>2009-Feb-19: <a href="2019-02-19-the-odd-case-of-my-mugging.html">The odd case of my mugging</a></li> <li>2009-Feb-19: <a href="2019-02-19-the-odd-case-of-my-mugging.html">The odd case of my mugging</a></li>
<li>2009-Feb-03: <a href="2009-02-03-5-packet-tcp-connection.html">5-packet TCP connection?</a></li> <li>2009-Feb-03: <a href="2009-02-03-5-packet-tcp-connection.html">5-packet TCP connection?</a></li>
<li>2006-Feb-13: <a href="2006-02-13-is-sleep-effected-by-time-changes.html">Is sleep(3) effected by time changes?</a></li> <li>2006-Feb-13: <a href="2006-02-13-is-sleep-effected-by-time-changes.html">Is sleep(3) effected by time changes?</a></li>

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htmhtmll<!--# set var="title" value="SCTP Part #1" -->
<!--# set var="date" value="February 26, 2006" -->
<!--# include file="include/top.html" -->
I’ve been doing some work with SCTP lately. I’m working through some of the intricacies of the protocol and the brain damage of the APIs (there are two of them, and they both suck). As I write my own API, I thought I’d post a few things here showing, from examples, the nifty stuff that the protocol does. Here’s the first, dealing with message length preservation:
MSG_EOR = 128
IPV6/TCP:
send("ABCDEFGH", 8) = 8
send("01234567", 8) = 8
recv(16, MSG_DONTWAIT) = 16
recv(16, MSG_DONTWAIT) = -1
========
send("ABCDEFGH", 8) = 8
send("01234567", 8) = 8
recvmsg(5, MSG_DONTWAIT) = 5
-----> msg_flags = 0
recvmsg(11, MSG_DONTWAIT) = 11
-----> msg_flags = 0
recvmsg(11, MSG_DONTWAIT) = -1
-----> msg_flags = 0
IPV6/SCTP:
send("ABCDEFGH", 8) = 8
send("01234567", 8) = 8
recv(16, MSG_DONTWAIT) = 8
recv(16, MSG_DONTWAIT) = 8
========
send("ABCDEFGH", 8) = 8
send("01234567", 8) = 8
recvmsg(5, MSG_DONTWAIT) = 5
-----> msg_flags = 0
recvmsg(11, MSG_DONTWAIT) = 3
-----> msg_flags = 128
recvmsg(11, MSG_DONTWAIT) = 8
-----> msg_flags = 128
<!--# include file="include/bottom.html" -->

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markdown/index.md
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@@ -37,6 +37,7 @@
1. 2010-Mar-26: [Fun with map visualizations](2010-03-26-fun-with-map-visualizations.html) 1. 2010-Mar-26: [Fun with map visualizations](2010-03-26-fun-with-map-visualizations.html)
1. 2010-Mar-09: [Karaoke project](2010-03-09-karaoke-project.html) 1. 2010-Mar-09: [Karaoke project](2010-03-09-karaoke-project.html)
1. 2009-Sep-11: [Confusing BIND with CNAMEs](2009-09-11-confusing-bind-with-cnames.html) 1. 2009-Sep-11: [Confusing BIND with CNAMEs](2009-09-11-confusing-bind-with-cnames.html)
1. 2009-Feb-26: [SCTP Part #1](2006-02-26-sctp-part-1.html)
1. 2009-Feb-19: [The odd case of my mugging](2019-02-19-the-odd-case-of-my-mugging.html) 1. 2009-Feb-19: [The odd case of my mugging](2019-02-19-the-odd-case-of-my-mugging.html)
1. 2009-Feb-03: [5-packet TCP connection?](2009-02-03-5-packet-tcp-connection.html) 1. 2009-Feb-03: [5-packet TCP connection?](2009-02-03-5-packet-tcp-connection.html)
1. 2006-Feb-13: [Is sleep(3) effected by time changes?](2006-02-13-is-sleep-effected-by-time-changes.html) 1. 2006-Feb-13: [Is sleep(3) effected by time changes?](2006-02-13-is-sleep-effected-by-time-changes.html)