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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/917#note_178417550">lib/auth/psk.h</a>:
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* callback function, instead of reading the</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * password files.</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_psk_server_credentials_function</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">pwd_callback</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="c"> <span class="k" style="font-weight: 600;">union</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_psk_server_credentials_function</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">cb1</span><span class="p">;</span></span>
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<p dir="auto">Here you introduce two options for callbacks. What I propose above is to store one callback only (the new), and when the old callback is requested by the application you set as the callback a wrapper which interfaces between them.</p>
<p dir="auto">See this approach in:
<a href="https://gitlab.com/gnutls/gnutls/blob/master/lib/cert-cred.c#L707">https://gitlab.com/gnutls/gnutls/blob/master/lib/cert-cred.c#L707</a></p>
<p dir="auto">There <code>get_cert_callback3</code> is the callback supported internally by the library, but when a previous version is requested by the application, a pwrapper function <code>call_legacy_cert_cb1</code>](<a href="https://gitlab.com/gnutls/gnutls/blob/master/lib/cert-cred.c#L564">https://gitlab.com/gnutls/gnutls/blob/master/lib/cert-cred.c#L564</a>) is set.</p>
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