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-<html>
-<head><title>Milter API</title></head>
-<body>
-<!--
-$Id: api.html,v 1.18 2004/04/28 23:26:51 msk Exp $
--->
-<h1>Milter API</h1>
-
-<h2>Contents</h2>
-<ul>
-    <li>Library Control Functions
-    <li>Data Access Functions
-    <li>Message Modification Functions
-    <li>Callbacks
-</ul>
-
-<h2>Library Control Functions</h2> 
-
-Before handing control to libmilter (by calling <a
-href="smfi_main.html">smfi_main</a>), a filter may call the following
-functions to set libmilter parameters.  In particular, the filter must
-call <a href="smfi_register.html">smfi_register</a> to register its
-callbacks.  Each function will return either MI_SUCCESS or MI_FAILURE to
-indicate the status of the operation.  
-<p>
-None of these functions communicate with the MTA.  All alter the
-library's state, some of which is communicated to the MTA inside <a
-href="smfi_main.html">smfi_main</a>.
-<p>
-<table border="1" cellspacing=0 cellpadding=2><tr bgcolor="#dddddd"><th>Function</th><th>Description</th></tr>
-
-<tr><td><a href="smfi_opensocket.html">smfi_opensocket</a></td><td>Try to create the interface socket.</td></tr>
-
-<tr><td><a href="smfi_register.html">smfi_register</a></td><td>Register a filter.</td></tr>
-
-<tr><td><a href="smfi_setconn.html">smfi_setconn</a></td><td>Specify socket to use.</td></tr>
-
-<tr><td><a href="smfi_settimeout.html">smfi_settimeout</a></td><td>Set timeout.</td></tr>
-
-<tr><td><a href="smfi_setbacklog.html">smfi_setbacklog</a></td><td>Define the incoming <i>listen</i>(2) queue size.</td></tr>
-
-<tr><td><a href="smfi_setdbg.html">smfi_setdbg</a></td><td>Set the milter library debugging (tracing) level.</td></tr>
-
-<tr><td><a href="smfi_stop.html">smfi_stop</a></td><td>Cause an orderly shutdown.</td></tr>
-
-<tr><td><a href="smfi_main.html">smfi_main</a></td><td>Hand control to libmilter.</td></tr>
-
-</table>
-
-<h2>Data Access Functions</h2>
-
-The following functions may be called from within the filter-defined callbacks
-to access information about the current connection or message.  
-<p>
-<table border="1" cellspacing=0 cellpadding=2><tr bgcolor="#dddddd"><th>Function</th><th>Description</th></tr>
-<tr><td><a href="smfi_getsymval.html">smfi_getsymval</a></td><td>Return the value
-of a symbol.</td></tr>
-
-<tr><td><a href="smfi_getpriv.html">smfi_getpriv</a></td><td>Get the private data
-pointer.</td></tr>
-
-<tr><td><a href="smfi_setpriv.html">smfi_setpriv</a></td><td>Set the private data
-pointer.</td></tr>
-
-<tr><td><a href="smfi_setreply.html">smfi_setreply</a></td><td>Set the specific
-reply code to be used.</td></tr>
-
-<tr><td><a href="smfi_setmlreply.html">smfi_setmlreply</a></td><td>Set the
-specific multi-line reply to be used.</td></tr>
-
-</table>
-
-<h2>Message Modification Functions</h2>
-
-The following functions change a message's contents and attributes.
-<b>They may only be called in <a href="xxfi_eom.html">xxfi_eom</a></b>.
-All of these functions may invoke additional communication with the MTA.
-They will return either MI_SUCCESS or MI_FAILURE to indicate the status of
-the operation.
-
-<p>
-A filter must have set the appropriate flag (listed below) in the
-description passed to <a href="smfi_register.html">smfi_register</a>
-to call any message modification function.  Failure to do so will
-cause the MTA to treat a call to the function as a failure of the
-filter, terminating its connection.
-
-<p>
-Note that the status returned indicates only whether or not the
-filter's message was successfully sent to the MTA, not whether or not
-the MTA performed the requested operation.  For example, <a
-href="smfi_addheader.html">smfi_addheader</a>, when called with an
-illegal header name, will return MI_SUCCESS even though the MTA may
-later refuse to add the illegal header.
-<p>
-<table border="1" cellspacing=0 cellpadding=2><tr bgcolor="#dddddd"><th>Function</th><th>Description</th><th>SMFIF_* flag</tr>
-<tr><td><a href="smfi_addheader.html">smfi_addheader</a></td><td>Add a header to
-the message.</td><td>SMFIF_ADDHDRS</td></tr> 
-
-<tr><td><a href="smfi_chgheader.html">smfi_chgheader</a></td><td>Change or delete a header.</td><td>SMFIF_CHGHDRS</td></tr> 
-
-<tr><td><a href="smfi_insheader.html">smfi_insheader</a></td><td>Insert a
-header into the message.</td><td>SMFIF_ADDHDRS</td></tr> 
-
-<tr><td><a href="smfi_addrcpt.html">smfi_addrcpt</a></td><td>Add a recipient to
-the envelope.</td><td>SMFIF_ADDRCPT</td></tr>
-
-<tr><td><a href="smfi_delrcpt.html">smfi_delrcpt</a></td><td>Delete a recipient
-from the envelope.</td><td>SMFIF_DELRCPT</td></tr>
-
-<tr><td><a href="smfi_replacebody.html">smfi_replacebody</a></td><td>Replace the
-body of the message.</td><td>SMFIF_CHGBODY</td></tr>
-
-</table>
-
-<h2>Other Message Handling Functions</h2>
-
-The following functions provide special case handling instructions for
-milter or the MTA, without altering the content or status of the message.
-<b>They too may only be called in <a href="xxfi_eom.html">xxfi_eom</a></b>.
-All of these functions may invoke additional communication with the MTA.
-They will return either MI_SUCCESS or MI_FAILURE to indicate the status of
-the operation.
-
-<p>
-Note that the status returned indicates only whether or not the
-filter's message was successfully sent to the MTA, not whether or not
-the MTA performed the requested operation.
-
-<p>
-<table border="1" cellspacing=0 cellpadding=2><tr bgcolor="#dddddd"><th>Function</th><th>Description</th></tr>
-<tr><td><a href="smfi_progress.html">smfi_progress</a></td><td>Report operation in progress.</td></tr>
-
-<tr><td><a href="smfi_quarantine.html">smfi_quarantine</a></td><td>Quarantine a message.</td></tr>
-
-</table>
-
-<h2><a name="callbacks">Callbacks</a></h2>
-
-The filter should implement one or more of the following callbacks,
-which are registered via <a href="smfi_register.html">smfi_register</a>:
-<p>
-<table border="1" cellspacing=0 cellpadding=2><tr bgcolor="#dddddd"><th>Function</th><th>Description</th></tr>
-
-<tr><td><a href="xxfi_connect.html">xxfi_connect</a></td><td>connection info</td></tr>
-
-<tr><td><a href="xxfi_helo.html">xxfi_helo</a></td><td>SMTP HELO/EHLO command</td></tr>
-
-<tr><td><a href="xxfi_envfrom.html">xxfi_envfrom</a></td><td>envelope sender</td></tr>
-
-<tr><td><a href="xxfi_envrcpt.html">xxfi_envrcpt</a></td><td>envelope recipient</td></tr>
-
-<tr><td><a href="xxfi_header.html">xxfi_header</a></td><td>header</td></tr>
-
-<tr><td><a href="xxfi_eoh.html">xxfi_eoh</a></td><td>end of header</td></tr>
-
-<tr><td><a href="xxfi_body.html">xxfi_body</a></td><td>body block</td></tr>
-
-<tr><td><a href="xxfi_eom.html">xxfi_eom</a></td><td>end of message</td></tr>
-
-<tr><td><a href="xxfi_abort.html">xxfi_abort</a></td><td>message aborted</td></tr>
-
-<tr><td><a href="xxfi_close.html">xxfi_close</a></td><td>connection cleanup</td></tr>
-
-</table>
-
-<p>
-The above callbacks should all return one of the following return values,
-having the indicated meanings.  Any return other than one of the below
-values constitutes an error, and will cause sendmail to terminate its
-connection to the offending filter.
-
-<p><a name="conn-spec">Milter</a> distinguishes between recipient-,
-message-, and connection-oriented routines.  Recipient-oriented
-callbacks may affect the processing of a single message recipient;
-message-oriented callbacks, a single message; connection-oriented
-callbacks, an entire connection (during which multiple messages may be
-delivered to multiple sets of recipients).
-<a href="xxfi_envrcpt.html">xxfi_envrcpt</a> is recipient-oriented.
-<a href="xxfi_connect.html">xxfi_connect</a>,
-<a href="xxfi_helo.html">xxfi_helo</a> and
-<a href="xxfi_close.html">xxfi_close</a> are connection-oriented.  All
-other callbacks are message-oriented.
-
-<p>
-<table border="1" cellspacing=0 cellpadding=2>
-  <tr bgcolor="#dddddd"><th>Return value</th><th>Description</th></tr>
-  <tr valign="top">
-     <td>SMFIS_CONTINUE</td> 
-     <td>Continue processing the current connection, message, or recipient.
-     </td>
-  </tr>
-  <tr valign="top">
-     <td>SMFIS_REJECT</td>
-     <td>For a connection-oriented routine, reject this connection; call <a href="xxfi_close.html">xxfi_close</a>.<br>
-        For a message-oriented routine (except 
-	<a href="xxfi_eom.html">xxfi_eom</a> or
-        <a href="xxfi_abort.html">xxfi_abort</a>), reject this message.<br>
-	For a recipient-oriented routine, reject the current recipient (but continue processing the current message).
-     </td>
-  </tr>
-  <tr valign="top">
-     <td>SMFIS_DISCARD</td>
-     <td>For a message- or recipient-oriented routine, accept this message, but silently discard it.<br>
-     SMFIS_DISCARD should not be returned by a connection-oriented routine.
-     </td>
-  </tr>
-  <tr valign="top">
-     <td>SMFIS_ACCEPT</td>
-     <td>For a connection-oriented routine, accept this connection without further filter processing; call <a href="xxfi_close.html">xxfi_close</a>.<br>
-         For a message- or recipient-oriented routine, accept this message without further filtering.<br>
-     </td>
-  </tr>
-  <tr valign="top">
-     <td>SMFIS_TEMPFAIL</td>
-     <td>Return a temporary failure, i.e., the corresponding SMTP command will return an appropriate 4xx status code.
-	 For a message-oriented routine (except <a href="xxfi_envfrom.html">xxfi_envfrom</a>), fail for this message. <br>
-	 For a connection-oriented routine, fail for this connection; call <a href="xxfi_close.html">xxfi_close</a>. <br>
-	 For a recipient-oriented routine, only fail for the current recipient; continue message processing.
-     </td>
-  </tr>
-</table>
-
-<hr size="1">
-<font size="-1">
-Copyright (c) 2000, 2003 Sendmail, Inc. and its suppliers.
-All rights reserved.
-<br>
-By using this file, you agree to the terms and conditions set
-forth in the LICENSE.
-</font>
-</body>
-</html>