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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/775#note_112946267">lib/tls13/session_ticket.c</a>:
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<pre style="margin: 0;"> <span id="LC229" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC232" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="nf" style="color: #900; font-weight: 600;">append_nst_extension</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">ctx</span><span class="p">,</span> <span class="n" style="color: #333;">gnutls_buffer_st</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">buf</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_session_t</span> <span class="n" style="color: #333;">session</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctx</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">internals</span><span class="p">.</span><span class="n" style="color: #333;">flags</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">GNUTLS_ENABLE_EARLY_DATA</span><span class="p">))</span></span>
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<p dir="auto">Indeed, that's why I think we shouldn't communicate (as server) values which don't have much sense as they may cause unpredictable behavior to clients. Alternatively, we could return an error when a zero value is set.</p>
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