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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1576/">https://reviewboard.asterisk.org/r/1576/</a>
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<p style="margin-top: 0;">On November 21st, 2011, 3:19 a.m., <b>wdoekes</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Better. A couple of points:</pre>
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<p>On November 21st, 2011, 3:28 a.m., <b>wdoekes</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">P.S. A couple of relevant bugs:
https://issues.asterisk.org/jira/browse/ASTERISK-18342
https://issues.asterisk.org/jira/browse/ASTERISK-18345
I linked them in Jira.</pre>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'll keep this in mind for the final log message. Definitely seem related, and hopefully they might be fixed by these upcoming patches.</pre>
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<p style="margin-top: 0;">On November 21st, 2011, 3:19 a.m., <b>wdoekes</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1576/diff/3/?file=21782#file21782line25957" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int sip_prepare_socket(struct sip_pvt *p)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">s</span><span class="o">-></span><span class="n">fd</span> <span class="o">=</span> <span class="n">tcptls_session</span><span class="o">-></span><span class="n">fd</span><span class="hl"> </span><span class="o"><span class="hl">=</span></span><span class="hl"> </span><span class="o"><span class="hl">-</span></span><span class="mi"><span class="hl">1</span></span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">s</span><span class="o">-></span><span class="n">fd</span> <span class="o">=</span> <span class="n">tcptls_session</span><span class="o">-></span><span class="n">fd</span><span class="p">;</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I prefer:
s->fd = -1;
Otherwise you have to look inside the opaque ast_tcptls_close_session_file to know what fd is. (And.. as an added bonus, setting it from a constant is cheaper.)
Unless you plan to *not* set tcptls_session->fd to -1 under some circumstances, but that would likely only add to the confusion.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Right. The tcptls_session->fd should always be set to -1 by ast_tcptls_close_session_file unless it already is -1, so that's a safe assumption and this change makes perfect sense.</pre>
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<p style="margin-top: 0;">On November 21st, 2011, 3:19 a.m., <b>wdoekes</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1576/diff/3/?file=21783#file21783line180" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/tcptls.h</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct ast_tcptls_session_instance *ast_tcptls_client_start(struct ast_tcptls_session_instance *tcptls_session);</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \brief Closes a tcptls session instance's file and/or file descriptor.</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">+ and sets them to NULL and -1 respectively.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">k, got it.</pre>
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<p style="margin-top: 0;">On November 21st, 2011, 3:19 a.m., <b>wdoekes</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1576/diff/3/?file=21784#file21784line79" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/tcptls.c</a>
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(Diff revision 3)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static HOOK_T ssl_write(void *cookie, const char *buf, LEN_T len)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">int</span> <span class="n">ssl_close</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">cookie</span><span class="p">)</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">int</span> <span class="n">ssl_close</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">cookie</span><span class="p">)</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">close</span><span class="p">(</span><span class="n">SSL_get_fd</span><span class="p">(</span><span class="n">cookie</span><span class="p">));</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">cookie_fd</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">SSL_shutdown</span><span class="p">(</span><span class="n">cookie</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/* SSL_shutdown hasn't received peer "close notify" alert, SSL_shutdown again. */</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">SSL_shutdown</span><span class="p">(</span><span class="n">cookie</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">SSL_shutdown</span><span class="p">(</span><span class="n">cookie</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">cookie_fd</span> <span class="o">=</span> <span class="n">SSL_get_fd</span><span class="p">(</span><span class="n">cookie</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">cookie_fd</span> <span class="o">></span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">close</span><span class="p">(</span><span class="n">cookie_fd</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_log</span><span class="p">(</span><span class="n">LOG_ERROR</span><span class="p">,</span> <span class="s">"close() failed: %s</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">strerror</span><span class="p">(</span><span class="n">errno</span><span class="p">));</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">SSL_free</span><span class="p">(</span><span class="n">cookie</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">SSL_free</span><span class="p">(</span><span class="n">cookie</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="mi">0</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="mi">0</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">}</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I would go with something like this:
static int ssl_close(void *cookie)
{
int cookie_fd = SSL_get_fd(cookie);
int ret;
if (cookie_fd > -1) {
/* According to the TLS standard, it is acceptable for an application to only send its shutdown alert and then close the underlying connection without waiting for the peer's response (this way resources can be saved, as the process can already terminate or serve another connection). */
if ((ret = SSL_shutdown(cookie)) < 0) {
ast_log(LOG_ERROR, "SSL_shutdown() failed: %d\n", SSL_get_error(cookie, ret));
}
SSL_free(cookie);
/* adding shutdown(2) here has no added enefit */
if (close(cookie_fd)) {
ast_log(LOG_ERROR, "close() failed: %s\n", strerror(errno));
}
}
return 0;
}
But -- and a big one: doing things by the book here (the new SSL_shutdown) MAY case the thread to block during this operation.
If it turns out that moving up the SSL_shutdown causes hangs, it should probably be removed altogether (with a nice #if 0) until a better solution is implemented.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Well, I changed this in as you have suggested and in a little rudimentary test it seems to work fine under normal conditions so far with the SSL_close occuring once the SIP dialog expires... no particularly noticeable problems anyway, as it got through the code path all at once, but it was just a basic SIP TLS call test. I'll keep an eye open for any reports related to this if we can commit it.
Getting ready to post the revised patch.</pre>
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<p>- jrose</p>
<br />
<p>On November 17th, 2011, 11:01 a.m., jrose wrote:</p>
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<div>Review request for Asterisk Developers, David Vossel and mjordan.</div>
<div>By jrose.</div>
<p style="color: grey;"><i>Updated Nov. 17, 2011, 11:01 a.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">According to the reporter, chan_sip and tcptls were using an odd combination of close and fclose which can result in undefined behavior. Following the man pages for fclose and close, attempting to fclose a file with an already closed file descriptor results in undefined behavior, and fclose itself will already close the file descriptor, so using fclose and then close is redundant. The reporter suggested as well that since file descriptors will experience frequent reuse that using fclose and then close could also result in closing a file descriptor that is in use elsewhere since there is time for that that file descriptor index to be reclaimed in the file descriptor table during the window between that fclose and the following close operation... or at least that's how I interpreted it.
I removed all uses of the close function when there was an adjacent fclose. I'm still not 100% sure if this is the right approach since this behavior introduced in a patch by dvossel in r225445, which can be seen here: http://lists.digium.com/pipermail/asterisk-commits/2009-October/038031.html I'm a little worried that this might be because the file descriptor received a redundant reference somewhere along the line and these close() functions might have been used to close a file descriptor leak or something along those lines.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Set up some TLS calls and used core show fd (with DEBUG_FD_LEAKS enabled) to make sure this wasn't causing a bunch of file descriptor leaks. From what I could find, it wasn't.</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-18700">ASTERISK-18700</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/trunk/channels/chan_sip.c <span style="color: grey">(344846)</span></li>
<li>/trunk/include/asterisk/tcptls.h <span style="color: grey">(344846)</span></li>
<li>/trunk/main/tcptls.c <span style="color: grey">(344846)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1576/diff/" style="margin-left: 3em;">View Diff</a></p>
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