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<section id="krb5-init-creds-step-get-the-next-kdc-request-for-acquiring-initial-credentials">
<h1>krb5_init_creds_step - Get the next KDC request for acquiring initial credentials.<a class="headerlink" href="#krb5-init-creds-step-get-the-next-kdc-request-for-acquiring-initial-credentials" title="Link to this heading">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.krb5_init_creds_step">
<a class="reference internal" href="../types/krb5_error_code.html#c.krb5_error_code" title="krb5_error_code"><span class="n"><span class="pre">krb5_error_code</span></span></a><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">krb5_init_creds_step</span></span></span><span class="sig-paren">(</span><a class="reference internal" href="../types/krb5_context.html#c.krb5_context" title="krb5_context"><span class="n"><span class="pre">krb5_context</span></span></a><span class="w"> </span><span class="n"><span class="pre">context</span></span>, <a class="reference internal" href="../types/krb5_init_creds_context.html#c.krb5_init_creds_context" title="krb5_init_creds_context"><span class="n"><span class="pre">krb5_init_creds_context</span></span></a><span class="w"> </span><span class="n"><span class="pre">ctx</span></span>, <a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data"><span class="n"><span class="pre">krb5_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">in</span></span>, <a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data"><span class="n"><span class="pre">krb5_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">out</span></span>, <a class="reference internal" href="../types/krb5_data.html#c.krb5_data" title="krb5_data"><span class="n"><span class="pre">krb5_data</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">realm</span></span>, <span class="kt"><span class="pre">unsigned</span></span><span class="w"> </span><span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">flags</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_init_creds_step" title="Link to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="field-list">
<dt class="field-odd">param<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>[in]</strong> <strong>context</strong> - Library context</p>
<p><strong>[in]</strong> <strong>ctx</strong> - Initial credentials context</p>
<p><strong>[in]</strong> <strong>in</strong> - KDC response (empty on the first call)</p>
<p><strong>[out]</strong> <strong>out</strong> - Next KDC request</p>
<p><strong>[out]</strong> <strong>realm</strong> - Realm for next KDC request</p>
<p><strong>[out]</strong> <strong>flags</strong> - Output flags</p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">retval<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p>0 Success; otherwise - Kerberos error codes</p></li>
</ul>
</dd>
</dl>
<p>This function constructs the next KDC request in an initial credential exchange, allowing the caller to control the transport of KDC requests and replies. On the first call, <em>in</em> should be set to an empty buffer; on subsequent calls, it should be set to the KDC’s reply to the previous request.</p>
<p>If more requests are needed, <em>flags</em> will be set to KRB5_INIT_CREDS_STEP_FLAG_CONTINUE and the next request will be placed in <em>out</em> . If no more requests are needed, <em>flags</em> will not contain KRB5_INIT_CREDS_STEP_FLAG_CONTINUE and <em>out</em> will be empty.</p>
<p>If this function returns <strong>KRB5KRB_ERR_RESPONSE_TOO_BIG</strong> , the caller should transmit the next request using TCP rather than UDP. If this function returns any other error, the initial credential exchange has failed.</p>
<blockquote>
<div><p><em>context</em> must be the same as the one passed to krb5_init_creds_init() for this initial credentials context.</p>
</div></blockquote>
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