121 lines
3.8 KiB
HTML
121 lines
3.8 KiB
HTML
<HTML>
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<HEAD><TITLE>smfi_chgheader</TITLE></HEAD>
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<BODY>
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<!--
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$Id: smfi_chgheader.html,v 1.17 2006/12/21 18:30:35 ca Exp $
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-->
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<H1>smfi_chgheader</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_chgheader(
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SMFICTX *ctx,
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char *headerf,
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mi_int32 hdridx,
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char *headerv
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);
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</PRE>
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Change or delete a message header.
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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>Changes a header's value for 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>hdridx</TD>
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<TD>Header index value (1-based). A hdridx value of 1 will modify the first occurrence of a header named headerf. If hdridx is greater than the number of times headerf appears, a new copy of headerf will be added.
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</TD></TR>
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<TR valign="top"><TD>headerv</TD>
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<TD>The new value of the given header. headerv == NULL implies that the header should be deleted.
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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>
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smfi_chgheader will return MI_FAILURE if
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<UL><LI>headerf is NULL
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<LI>Modifying 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_CHGHDRS 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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</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>While smfi_chgheader may be used to add new headers, it is more efficient and far safer to use <A href="smfi_addheader.html">smfi_addheader</A>.
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<LI>A filter which calls smfi_chgheader must have set the SMFIF_CHGHDRS flag in the smfiDesc_str passed to <A href="smfi_register.html">smfi_register</A>.
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<LI>For smfi_chgheader, filter order is important. <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. However, each line of the header must be under
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2048 characters and should be under 998 characters. If longer headers
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are needed, make them multi-line. To make a multi-line header, insert
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a line feed (ASCII 0x0a, or <TT>\n</TT> in C) followed by at least
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one whitespace character such as a space (ASCII 0x20) or tab (ASCII 0x09,
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or <TT>\t</TT> in C). The line feed should NOT be preceded by a
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carriage return (ASCII 0x0d); 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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</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_chgheader(ctx, "Content-Type", 1,
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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 Sendmail, 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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