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smfi_insheader(3N)					    smfi_insheader(3N)

NAME
       smfi_insheader() - prepends a header to the current sendmail message

SYNOPSIS
PARAMETERS
       ctx	 Specifies the opaque context structure.

       hdridx	 Specifies  the location in the internal header list where the
		 header must be inserted.  A value  of	0  (zero)  places  the
		 header in the beginning of the header.

       headerf	 Specifies  the	 header name, which is a non-NULL, null-termi‐
		 nated string.

       headerv	 Specifies the header value to be added.  A header value is  a
		 non-NULL, null-terminated string and can be an empty string.

DESCRIPTION
       prepends	 a header to the current message.  can be called only from the
       function.

   Notes
       ·  does not change existing headers of a message.  To change  the  cur‐
	  rent value of a header, use the routine.

       ·  A filter that calls must set the flag in the structure passed to the
	  routine.

       ·  For the filter, the order in which filters are placed	 is  imporant.
	  Filters  placed  later  in  the  sequence  will  observe the changes
	  already done by the earlier filters.

       ·  If the value of hdridx larger than the number of headers in the mes‐
	  sage, the header is simply be appended.

       ·  The  name  and the value of the header are not checked for standards
	  compliance.  However, each line of the header	 must  be  under  2048
	  characters.  If longer headers are needed, multi-line header must be
	  used.	 To make a multi-line header, insert a linefeed	 (ASCII	 0x0a,
	  or  \n in C) followed by at least one whitespace character, such as,
	  a space (ASCII 0x20) or tab (ASCII 0x09, or \t in C).	 The  linefeed
	  must not be preceded by a carriage return (ASCII 0x0d); the MTA adds
	  this automatically.  It is the responsibility of the	filter	writer
	  to ensure that standards are not violated.

RETURN VALUE
       returns due to the following reasons:

       ·  The headerf or headerv value is NULL.
       ·  Adding headers in the current connection state is invalid.
       ·  Memory allocation fails.
       ·  Network error occurs.
       ·  is not set when is called.

       returns on success.

EXAMPLES
AUTHOR
       was developed by the Sendmail Inc.

SEE ALSO
       smfi_chgheader(3N),  smfi_addheader(3N),	 smfi_addrcpt(3N),  smfi_delr‐
       cpt(3N), smfi_replacebody(3N).

       on

							    smfi_insheader(3N)

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