131 lines
3.8 KiB
HTML
131 lines
3.8 KiB
HTML
<HTML>
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<HEAD><TITLE>smfi_addheader</TITLE></HEAD>
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<BODY>
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<!--
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$Id: smfi_addheader.html,v 1.21 2013-11-22 20:51:39 ca Exp $
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-->
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<H1>smfi_addheader</H1>
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<TABLE border="0" cellspacing=4 cellpadding=4>
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<!---------- Synopsis ----------->
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<TR><TH valign="top" align=left width=100>SYNOPSIS</TH><TD>
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<PRE>
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#include <libmilter/mfapi.h>
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int smfi_addheader(
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SMFICTX *ctx,
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char *headerf,
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char *headerv
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);
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</PRE>
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Add a header to the current message.
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</TD></TR>
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<!----------- Description ---------->
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<TR><TH valign="top" align=left>DESCRIPTION</TH><TD>
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<TABLE border="1" cellspacing=1 cellpadding=4>
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<TR align="left" valign=top>
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<TH width="80">Called When</TH>
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<TD>Called only from <A href="xxfi_eom.html">xxfi_eom</A>.</TD>
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</TR>
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<TR align="left" valign=top>
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<TH width="80">Effects</TH>
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<TD>Adds a header to the current message.</TD>
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</TR>
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</TABLE>
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<!----------- Arguments ---------->
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<TR><TH valign="top" align=left>ARGUMENTS</TH><TD>
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<TABLE border="1" cellspacing=0>
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<TR bgcolor="#dddddd"><TH>Argument</TH><TH>Description</TH></TR>
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<TR valign="top"><TD>ctx</TD>
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<TD>Opaque context structure.
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</TD></TR>
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<TR valign="top"><TD>headerf</TD>
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<TD>The header name, a non-NULL, null-terminated string.
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</TD></TR>
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<TR valign="top"><TD>headerv</TD>
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<TD>The header value to be added, a non-NULL, null-terminated string.
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This may be the empty string.
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</TD></TR>
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</TABLE>
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</TD></TR>
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<!----------- Return values ---------->
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<TR>
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<TH valign="top" align=left>RETURN VALUES</TH>
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<TD>smfi_addheader returns MI_FAILURE if:
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<UL><LI>headerf or headerv is NULL.
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<LI>Adding headers in the current connection state is invalid.
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<LI>Memory allocation fails.
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<LI>A network error occurs.
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<LI>SMFIF_ADDHDRS was not set when <A href="smfi_register.html">smfi_register</A> was called.
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</UL>
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Otherwise, it returns MI_SUCCESS.
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</TD>
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</TR>
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<!----------- Notes ---------->
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<TR align="left" valign=top>
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<TH>NOTES</TH>
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<TD>
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<UL><LI>smfi_addheader does not change a message's existing headers.
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To change a header's current value, use
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<A HREF="smfi_chgheader.html">smfi_chgheader</A>.
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<LI>A filter which calls smfi_addheader must have set the SMFIF_ADDHDRS
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flag in the smfiDesc_str passed to
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<A href="smfi_register.html">smfi_register</A>.
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<LI>For smfi_addheader, filter order is important.
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<B>Later filters will see the header changes made by earlier ones.</B>
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<LI>Neither the name nor the value of the header is checked for
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standards compliance.
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However, each line of the header must be under 2048 characters
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and should be under 998 characters.
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If longer headers are needed, make them multi-line.
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To make a multi-line header,
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insert a line feed (ASCII 0x0a, or <TT>\n</TT> in C)
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followed by at least one whitespace character
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such as a space (ASCII 0x20) or tab (ASCII 0x09, or <TT>\t</TT> in C).
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The line feed should NOT be preceded by a carriage return (ASCII 0x0d);
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the MTA will add this automatically.
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<B>It is the filter writer's responsibility to ensure that no standards
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are violated.</B>
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<LI>The MTA adds a leading space to an added header value unless
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the flag
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<A HREF="xxfi_negotiate.html#SMFIP_HDR_LEADSPC"><CODE>SMFIP_HDR_LEADSPC</CODE></A>
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is set, in which case the milter
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must include any desired leading spaces itself.
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</UL>
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</TD>
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</TR>
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<!----------- Example code ---------->
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<TR>
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<TH valign="top" align=left>EXAMPLE</TH>
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<TD>
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<PRE>
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int ret;
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SMFICTX *ctx;
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...
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ret = smfi_addheader(ctx, "Content-Type",
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"multipart/mixed;\n\tboundary=\"foobar\"");
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</PRE>
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</TD>
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</TR>
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</TABLE>
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<HR size="1">
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<FONT size="-1">
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Copyright (c) 2000-2003, 2006, 2009 Proofpoint, Inc. and its suppliers.
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All rights reserved.
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<BR>
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By using this file, you agree to the terms and conditions set
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forth in the LICENSE.
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</FONT>
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</BODY>
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</HTML>
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