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<a href="https://gitlab.com/rockdaboot">Tim Rühsen</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/891#note_134834402">lib/ext/server_name.c</a>:
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="c"> <span class="n" style="color: #333;">DECR_LEN</span><span class="p">(</span><span class="n" style="color: #333;">data_size</span><span class="p">,</span> <span class="n" style="color: #333;">len</span><span class="p">);</span></span>
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<td class="diff-line-num old_line" data-linenumber="106" 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="LC106" class="line" lang="c"></span>
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<td class="diff-line-num old_line" data-linenumber="107" 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">
107
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<td class="diff-line-num new_line" data-linenumber="107" 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="LC107" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">type</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span> <span class="cm" style="color: #998; font-style: italic;">/* NAME_DNS */</span></span>
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<td class="diff-line-num old old_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
108
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<pre style="margin: 0;">-<span id="LC108" 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="n" style="color: #333;">_gnutls_dnsname_is_valid</span><span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">char</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">len</span><span class="p">))</span></span>
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<td class="diff-line-num old old_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
109
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<td class="diff-line-num new_line old" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC109" 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_RECEIVED_ILLEGAL_PARAMETER</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC108" 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="n" style="color: #333;">_gnutls_dnsname_is_valid</span><span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">char</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">len</span><span class="p">))</span> <span class="p">{</span></span>
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<td class="diff-line-num new new_line" data-linenumber="109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_handshake_log</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="c"> <span class="p">(</span><span class="s" style="color: #d14;">"HSK[%p]: Server name is not acceptable: '%.*s'</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="c"> <span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">int</span><span class="p">)</span> <span class="n" style="color: #333;">len</span><span class="p">,</span> <span class="n" style="color: #333;">p</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC112" 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_UNRECOGNIZED_NAME</span><span class="p">);</span></span>
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<p dir="auto">As <a href="https://gitlab.com/dueno" data-user="470892" data-reference-type="user" data-container="body" data-placement="bottom" class="gfm gfm-project_member" title="Daiki Ueno">@dueno</a> pointed out in <a href="https://gitlab.com/gnutls/gnutls/issues/683#note_134637845" data-original="https://gitlab.com/gnutls/gnutls/issues/683#note_134637845" data-link="false" data-link-reference="true" data-project="179611" data-issue="17616804" data-reference-type="issue" data-container="body" data-placement="bottom" title="OpenSSL IPv6 PSK Incompatibility" class="gfm gfm-issue has-tooltip">#683 (comment 134637845)</a>, the standards demand <code>ILLEGAL_PARAMETER</code>. So I changed the return value back to <code>GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER</code> and just left the logging message in. It gives us an explanation what happened with <code>gnutls-serv -d 4</code>.</p>
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