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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1465#note_1310714243">discussion</a>:
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">I can directly point you to the code, but maybe it might make sense to see how the current code works. If you successfully build the source code you will get test server and client in <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>src/gnutls-serv</code> and <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>src/gnutls-cli</code>. You can establish a TLS connection with something like:</p>
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<pre lang="console" class="code highlight js-syntax-highlight language-console" v-pre="true" style='display: block; font-size: 0.875rem; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: 0.875rem; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="console" style="margin-top: 0;"><span class="gp" style="margin-top: 0;">$</span><span class="w"> </span>src/gnutls-serv <span class="nt">--x509certfile</span><span class="o">=</span>doc/credentials/x509/cert-rsa-pss.pem <span class="nt">--x509keyfile</span><span class="o">=</span>doc/credentials/x509/key-rsa-pss.pem &</span>
<span id="LC2" class="line" lang="console"><span class="gp" style="margin-top: 0;">$</span><span class="w"> </span>src/gnutls-cli <span class="nt">-d4</span> <span class="nt">--x509cafile</span><span class="o">=</span>doc/credentials/x509/ca.pem localhost <span class="nt">-p</span> 5556</span></code></pre>
<copy-code></copy-code>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">then you will see something like "Sending extension OCSP Status Request/5 (5 bytes)" in the output.</p>
<p dir="auto" style="color: #333238; margin: 0;" align="initial">After that you see where the message comes from, with <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>git grep "Sending extension"</code> for example.</p>
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