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<p style="margin-top: 0;">On September 30th, 2011, 2:45 p.m., <b>Terry Wilson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1395/diff/1/?file=19531#file19531line4635" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_variable *get_insecure_variable_from_config(struct ast_config *cfg)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="k">struct</span> <span class="n">ast_variable</span> <span class="o">*</span><span class="nf">get_insecure_variable_from_realtime</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">family</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">column</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">value</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; "> <span class="k">struct</span> <span class="n">ast_config</span> <span class="o">*</span><span class="n">peerlist</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">struct</span> <span class="n">ast_variable</span> <span class="o">*</span><span class="n">var</span> <span class="o">=</span> <span class="nb">NULL</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="n">peerlist</span> <span class="o">=</span> <span class="n">ast_load_realtime_multientry</span><span class="p">(</span><span class="n">family</span><span class="p">,</span> <span class="n">column</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">SENTINEL</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="k">struct</span> <span class="n">ast_variable</span> <span class="o">*</span><span class="n">var</span> <span class="o">=</span> <span class="n">get_insecure_variable_from_config</span><span class="p">(</span><span class="n">peerlist</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="n">var</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">/* A quick and dirty ast_variables_clone */</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;">var is declared twice with two different scopes. Since var is only set non-NULL in the inner scope, the var that is returned will always be NULL.
The inner declaration should removed and then to be consistent with how most of the code is written, it should just be:
if ((var = get_insecure_variable_from_config(peerlist))</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;">Indeed. Fixed.</pre>
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<p style="margin-top: 0;">On September 30th, 2011, 2:45 p.m., <b>Terry Wilson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1395/diff/1/?file=19531#file19531line4655" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_variable *get_insecure_variable_from_config(struct ast_config *cfg)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="ew"> </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;">whitespace</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;">Fixed the whitespace.</pre>
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<p style="margin-top: 0;">On September 30th, 2011, 2:45 p.m., <b>Terry Wilson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1395/diff/1/?file=19531#file19531line4787" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_variable *get_insecure_variable_from_config(struct ast_config *cfg)</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</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="cm">/* Check for registered hosts (in sippeers) */</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">realtimeregs</span><span class="p">)</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="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">varregs</span> <span class="o">&&</span> <span class="p">(</span><span class="o">*</span><span class="n">var</span> <span class="o">=</span> <span class="n">ast_load_realtime</span><span class="p">(</span><span class="s">"sipregs"</span><span class="p">,</span> <span class="s">"ipaddr"</span><span class="p">,</span> <span class="n">ipaddr</span><span class="p">,</span> <span class="s">"port"</span><span class="p">,</span> <span class="n">portstring</span><span class="p">,</span> <span class="n">SENTINEL</span><span class="p">)))</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">peerlist</span> <span class="o">=</span> <span class="n">ast_load_realtime_multientry</span><span class="p">(</span><span class="s">"sipregs"</span><span class="p">,</span> <span class="s">"ipaddr"</span><span class="p">,</span> <span class="n">ipaddr</span><span class="p">,</span> <span class="n">SENTINEL</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="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;">This should most likely be ast_load_realtime("sippeers"... since we just checked sipregs and the comment says we are checking sippeers.</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;">Correct. The comment was right, the code was wrong.</pre>
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<p style="margin-top: 0;">On September 30th, 2011, 2:45 p.m., <b>Terry Wilson</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/1395/diff/1/?file=19531#file19531line4796" style="color: black; font-weight: bold; text-decoration: underline;">/branches/1.8/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_variable *get_insecure_variable_from_config(struct ast_config *cfg)</pre></td>
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<td bgcolor="#fdfebc" 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="cm">/* In the original code, it tried the sipregs next, but no sane</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</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="cm"> * person would have the insecure= column in the sipregs table,</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">peerlist</span> <span class="o">=</span> <span class="n">ast_load_realtime_multientry</span><span class="p">(</span><span class="s">"sippeers"</span><span class="p">,</span> <span class="s">"ipaddr"</span><span class="p">,</span> <span class="n">ipaddr</span><span class="p">,</span> <span class="n">SENTINEL</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="cm"> * so we'll skip that here.</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">peerlist</span><span class="p">)</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="cm"> *</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">var</span> <span class="o">=</span> <span class="n">get_insecure_variable_from_config</span><span class="p">(</span><span class="n">peerlist</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="cm"> * Theoretically, we could scan the sipregs and then look up the</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">var</span><span class="p">)</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="cm"> * sippeers for the insecure column, but that wasn't done in the</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">newpeername</span> <span class="o">=</span> <span class="n">get_name_from_variable</span><span class="p">(</span><span class="n">var</span><span class="p">,</span> <span class="n">newpeername</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="cm"> * original, and it sounds way too expensive. */</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;">Looking at the original code, it looks like it checks sipregs in a block where realtimeregs is guaranteed to be 0 anyway, so it never would have worked. If this is the case, then there is no functional behavior change and we can remove this comment.</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;">Wrong. The only no-op here is this:
{{{
peerlist = ast_load_realtime_multientry("sippeers", "ipaddr", ipaddr, SENTINEL);
if (peerlist) {
var = get_insecure_variable_from_config(peerlist);
if (var) {
newpeername = get_name_from_variable(var, newpeername);
this ---> varregs = ast_load_realtime("sipregs", "name", newpeername, SENTINEL);
}
}
}}}
The old functionality is this:
IF ANY host=ipaddr
- TRY find_insecure_from sippeers BY host=ipaddr
- TRY find_insecure_from sippeers BY ipaddr=ipaddr
ELSE IF using_sipregs
- TRY find_insecure_from sipregs BY ipaddr=ipaddr
ELSE
- TRY find_insecure_from sippeers BY ipaddr=ipaddr
But I think it should have been this:
IF ANY host=ipaddr
- TRY find_insecure_from sippeers BY host=ipaddr
- IF using_sipregs
- - TRY find_insecure_from sipregs BY ipaddr=ipaddr
- ELSE
- - TRY find_insecure_from sippeers BY ipaddr=ipaddr
ELSE IF using_sipregs
- TRY find_insecure_from sipregs BY ipaddr=ipaddr
ELSE
- TRY find_insecure_from sippeers BY ipaddr=ipaddr
The new code is this:
TRY find_insecure_from sippeers BY host=ipaddr
TRY find_insecure_from sippeers BY ipaddr=ipaddr
The new code probably should do this:
TRY find_insecure_from sippeers BY host=ipaddr
IF using_sipregs
- TRY find_insecure_from sipregs BY ipaddr=ipaddr
ELSE
- TRY find_insecure_from sippeers BY ipaddr=ipaddr
But for backward compatability we must (at least) do this:
TRY find_insecure_from sippeers BY host=ipaddr
IF using_sipregs
- TRY find_insecure_from sipregs BY ipaddr=ipaddr
TRY find_insecure_from sippeers BY ipaddr=ipaddr
The changes against live would be this (when using sipregs):
(a) When any host=ipaddr is found, now sipregs-ipaddr is checked too. <-- probably better
(b) If no host=ipaddr is found, now sippeers-ipaddr is checked too. <-- extra query for every non-matching peer
</pre>
<br />
<p>- wdoekes</p>
<br />
<p>On August 27th, 2011, 3:54 p.m., wdoekes wrote:</p>
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<div>Review request for Asterisk Developers.</div>
<div>By wdoekes.</div>
<p style="color: grey;"><i>Updated Aug. 27, 2011, 3:54 p.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;">There are several memory leaks in realtime_peer in chan_sip.c. For a thorough explanation, see the bug report.
Trying to patch those leaks would be making ugly code even uglier. This is an attempt at cleaning up the code a bit.
I attempted to keep the exact same behaviour as the original code, while increasing readability. (I had to clone the variable gotten from the peerlist to get proper cleanup behaviour.)
Differences:
- sippeers ipaddr is now checked even though sippeers host was not matched (I could not make sense of why ipaddr wasn't checked when host was not matched)
- I don't check sipregs for the insecure column
- the leaks should be gone ;)
Up for review here, because the changes are significant enough for me to have made (lots of) errors and because someone might feel that a rewrite is not the way to go.</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;">I tested that I got the same behaviour for the tests mentioned in the bug report. The leaks are gone, the bevahour seemed the same.
I'm too tired to test normal cases right now though.</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-18356">ASTERISK-18356</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/1.8/channels/chan_sip.c <span style="color: grey">(333496)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1395/diff/" style="margin-left: 3em;">View Diff</a></p>
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