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<section id="krb5-sendauth-client-function-for-sendauth-protocol">
<h1>krb5_sendauth - Client function for sendauth protocol.<a class="headerlink" href="#krb5-sendauth-client-function-for-sendauth-protocol" title="Permalink to this headline">¶</a></h1>
<dl class="c function">
<dt class="sig sig-object c" id="c.krb5_sendauth">
<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_sendauth</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_auth_context.html#c.krb5_auth_context" title="krb5_auth_context"><span class="n"><span class="pre">krb5_auth_context</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">auth_context</span></span>, <a class="reference internal" href="../types/krb5_pointer.html#c.krb5_pointer" title="krb5_pointer"><span class="n"><span class="pre">krb5_pointer</span></span></a><span class="w"> </span><span class="n"><span class="pre">fd</span></span>, <span class="kt"><span class="pre">char</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">appl_version</span></span>, <a class="reference internal" href="../types/krb5_principal.html#c.krb5_principal" title="krb5_principal"><span class="n"><span class="pre">krb5_principal</span></span></a><span class="w"> </span><span class="n"><span class="pre">client</span></span>, <a class="reference internal" href="../types/krb5_principal.html#c.krb5_principal" title="krb5_principal"><span class="n"><span class="pre">krb5_principal</span></span></a><span class="w"> </span><span class="n"><span class="pre">server</span></span>, <a class="reference internal" href="../types/krb5_flags.html#c.krb5_flags" title="krb5_flags"><span class="n"><span class="pre">krb5_flags</span></span></a><span class="w"> </span><span class="n"><span class="pre">ap_req_options</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_data</span></span>, <a class="reference internal" href="../types/krb5_creds.html#c.krb5_creds" title="krb5_creds"><span class="n"><span class="pre">krb5_creds</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">in_creds</span></span>, <a class="reference internal" href="../types/krb5_ccache.html#c.krb5_ccache" title="krb5_ccache"><span class="n"><span class="pre">krb5_ccache</span></span></a><span class="w"> </span><span class="n"><span class="pre">ccache</span></span>, <a class="reference internal" href="../types/krb5_error.html#c.krb5_error" title="krb5_error"><span class="n"><span class="pre">krb5_error</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">error</span></span>, <a class="reference internal" href="../types/krb5_ap_rep_enc_part.html#c.krb5_ap_rep_enc_part" title="krb5_ap_rep_enc_part"><span class="n"><span class="pre">krb5_ap_rep_enc_part</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">rep_result</span></span>, <a class="reference internal" href="../types/krb5_creds.html#c.krb5_creds" title="krb5_creds"><span class="n"><span class="pre">krb5_creds</span></span></a><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">out_creds</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.krb5_sendauth" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="field-list">
<dt class="field-odd">param</dt>
<dd class="field-odd"><p><strong>[in]</strong> <strong>context</strong> - Library context</p>
<p><strong>[inout]</strong> <strong>auth_context</strong> - Pre-existing or newly created auth context</p>
<p><strong>[in]</strong> <strong>fd</strong> - File descriptor that describes network socket</p>
<p><strong>[in]</strong> <strong>appl_version</strong> - Application protocol version to be matched with the receiver’s application version</p>
<p><strong>[in]</strong> <strong>client</strong> - Client principal</p>
<p><strong>[in]</strong> <strong>server</strong> - Server principal</p>
<p><strong>[in]</strong> <strong>ap_req_options</strong> - Options (see AP_OPTS macros)</p>
<p><strong>[in]</strong> <strong>in_data</strong> - Data to be sent to the server</p>
<p><strong>[in]</strong> <strong>in_creds</strong> - Input credentials, or NULL to use <em>ccache</em></p>
<p><strong>[in]</strong> <strong>ccache</strong> - Credential cache</p>
<p><strong>[out]</strong> <strong>error</strong> - If non-null, contains KRB_ERROR message returned from server</p>
<p><strong>[out]</strong> <strong>rep_result</strong> - If non-null and <em>ap_req_options</em> is #AP_OPTS_MUTUAL_REQUIRED, contains the result of mutual authentication exchange</p>
<p><strong>[out]</strong> <strong>out_creds</strong> - If non-null, the retrieved credentials</p>
</dd>
</dl>
<dl class="field-list simple">
<dt class="field-odd">retval</dt>
<dd class="field-odd"><ul class="simple">
<li><p>0 Success; otherwise - Kerberos error codes</p></li>
</ul>
</dd>
</dl>
<p>This function performs the client side of a sendauth/recvauth exchange by sending and receiving messages over <em>fd</em> .</p>
<p>Credentials may be specified in three ways:</p>
<blockquote>
<div><blockquote>
<div><ul class="simple">
<li><p>If <em>in_creds</em> is NULL, credentials are obtained with krb5_get_credentials() using the principals <em>client</em> and <em>server</em> . <em>server</em> must be non-null; <em>client</em> may NULL to use the default principal of <em>ccache</em> .</p></li>
<li><p>If <em>in_creds</em> is non-null, but does not contain a ticket, credentials for the exchange are obtained with krb5_get_credentials() using <em>in_creds</em> . In this case, the values of <em>client</em> and <em>server</em> are unused.</p></li>
<li><p>If <em>in_creds</em> is a complete credentials structure, it used directly. In this case, the values of <em>client</em> , <em>server</em> , and <em>ccache</em> are unused.</p></li>
</ul>
</div></blockquote>
<p>If the server is using a different application protocol than that specified in <em>appl_version</em> , an error will be returned.</p>
</div></blockquote>
<p>Use krb5_free_creds() to free <em>out_creds</em> , krb5_free_ap_rep_enc_part() to free <em>rep_result</em> , and krb5_free_error() to free <em>error</em> when they are no longer needed.</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<p>krb5_recvauth()</p>
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