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<div class="moz-cite-prefix">On 02/12/2015 11:21, Anty Rao wrote:<br>
</div>
<blockquote class=" cite"
id="mid_CAEmVhZWvYL9EJWEv6J_AZTeydWW4d_R0UDDaYkRd6DbT_pj_Nw_mail_gmail_com"
cite="mid:CAEmVhZWvYL9EJWEv6J+AZTeydWW4d-R0UDDaYkRd6DbT+pj+Nw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote id="Cite_2343553" class="gmail_quote cite"
style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div>Using non-blocking openssl , after detecting
underlying TCP is broken, i invoke SSL_read to
attempting reading response. *sometimes* response from
server is lost, sometimes not. But tcpdump show that
response is always send back to me. what is special is
that RST packages come next the response. Can someone
shed some light on me, Thanks.Here is the result of
tcpdump:</div>
</blockquote>
</div>
<pre style="white-space:pre-wrap;margin-top:0px;padding:5px;border:0px;font-size:13px;overflow:auto;width:auto;max-height:600px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;color:rgb(57,51,24);word-wrap:normal;background-color:rgb(238,238,238)"><code style="margin:0px;padding:0px;border:0px;font-family:Consolas,Menlo,Monaco,'Lucida Console','Liberation Mono','DejaVu Sans Mono','Bitstream Vera Sans Mono','Courier New',monospace,sans-serif;white-space:inherit"><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">16</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">18</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">00.168274</span><span style="margin:0px;padding:0px;bo
rder:0px;color:rgb(0,0,0)"> IP </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">17.143</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">161.207</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">2195</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">></span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> xx</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">xxx</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">xx</span><span style="margin:0px;padding:0px;border:0px;color:rgb
(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">xx</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">43361</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(43,145,175)">Flags</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">[</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">P</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.],</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> seq </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">4764</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span
style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">4801</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">,</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> ack </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">37462</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">,</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> win </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">432</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">,</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> option
s </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">[</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">nop</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">,</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">nop</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">,</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">TS val </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">1248125705</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> ecr </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">2355901348</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">],</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> length </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">37</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
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><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">118f</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> a1cf E</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">..</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">Y</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">6</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">@.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">......</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
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/span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">3724</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.<.....</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">a</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">...?!.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">7</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">$
</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0x0020</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">8018</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">01b0</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">245e</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0000</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0101</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><spa
n style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">080a</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">4a64</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> e309 </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">....</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">$</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">^......</span><span style="margin:0px;padding:0px;border:0px;color:rgb(43,145,175)">Jd</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">..</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
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/span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">37aa</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">l3</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">...........</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">7.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0x0040</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> eda1 e24a </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">1819</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">74cb</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">1a73</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">2396</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> f76e b9fa </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">...</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,
0,0)">J</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">..</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">t</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">..</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">s</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">#..</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">n</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">..</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
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</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">);.%....</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">16</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">18</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">00.168326</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> IP </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">17.143</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">161.207</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">2195</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">></span
><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> xx</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">xxx</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">xx</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">xx</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">43361</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(43,145,175)">Flags</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;pad
ding:0px;border:0px;color:rgb(0,0,0)">[</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">R</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.],</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> seq </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">4801</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">,</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> ack </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">37462</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">,</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> win </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">498</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">,</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> options </span><span style="margin:0px;padding:0px;bor
der:0px;color:rgb(0,0,0)">[</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">no
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><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">118f</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> a1cf E</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">..</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">4.7</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">@.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">......</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
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><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">4a64</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> e309 </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.....</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">u</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">......</span><span style="margin:0px;padding:0px;border:0px;color:rgb(43,145,175)">Jd</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">..</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">
</span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">0x0030</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">:</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">8c6c</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(128,0,0)">33a4</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)"> </span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">l3</span><span style="margin:0px;padding:0px;border:0px;color:rgb(0,0,0)">.</span></code></pre>
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</blockquote>
<p>When the TCP/IP stack on 17.143.161.207 sends back an RST it
means (amongst other things) that the entire connection is dead
and invalid (not a pretty/graceful close, but dead and invalid).
Thus the TCP/IP stack on xx.xxx.xx.xx is correct in throwing away
any received data it has not yet passed to application layer code
(such as OpenSSL).<br>
</p>
<p>An ordinary connection close should be sending a packet with the
FIN flag, not the RST flag and expect your computer to send back
an ACK of that FIN packet.<br>
</p>
<pre class="moz-signature" cols="72">Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. <a class="moz-txt-link-freetext" href="https://www.wisemo.com">https://www.wisemo.com</a>
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
This public discussion message is non-binding and may contain errors.
WiseMo - Remote Service Management for PCs, Phones and Embedded </pre>
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