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<a href="https://gitlab.com/Vrancken">Tom</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/774#note_109472790">lib/handshake.c</a>:
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* TLS1.2 or earlier, kx is associated with ciphersuite */</span></span>
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="c"> <span class="n" style="color: #333;">kx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">security_parameters</span><span class="p">.</span><span class="n" style="color: #333;">cs</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">kx_algorithm</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">kx</span><span class="p">)</span> <span class="p">{</span></span>
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555
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<td class="diff-line-num new_line" data-linenumber="570" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="c"> <span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">security_parameters</span><span class="p">.</span><span class="n" style="color: #333;">server_auth_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_map_kx_get_cred</span><span class="p">(</span><span class="n" style="color: #333;">kx</span><span class="p">,</span> <span class="mi" style="color: #099;">1</span><span class="p">);</span></span>
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556
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="c"> <span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">security_parameters</span><span class="p">.</span><span class="n" style="color: #333;">client_auth_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_map_kx_get_cred</span><span class="p">(</span><span class="n" style="color: #333;">kx</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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557
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<pre style="margin: 0;">-<span id="LC557" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="k" style="font-weight: 600;">if</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;">resumed</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">RESUME_FALSE</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC558" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">GNUTLS_E_INTERNAL_ERROR</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC572" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">unlikely</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;">resumed</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">RESUME_FALSE</span><span class="p">))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC573" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Here we can only arrive if something we received</span></span>
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<pre style="margin: 0;">+<span id="LC574" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * prevented the session from completing. */</span></span>
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">GNUTLS_E_ILLEGAL_PARAMETER</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC578" 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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<p dir="auto">That might be the case but I think it is not bad to change this convention then. It makes reading much clearer and we don't have this enum entry for nothing right? Once in a while it is good to upgrade to a better / nicer solution just as was the case with <code>gnutls_assert_val()</code> function.</p>
<p dir="auto">Anyway, in my contributions I return <code>GNUTLS_E_SUCCESS</code> in cases where I need to return an OK status code and use literals only where I need to return e.g. the number of bytes sent.</p>
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