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There may be some cases when you need to use an external filter that
processes the entire message (including headers). You cannot use
external-body-processor
, since it feeds only the
message body to the program. To overcome this difficulty, GNU Anubis
is shipped with `entire-msg.scm' module. This module provides
Scheme function entire-msg-filter
, which is to be used in
such cases.
Suppose you have a program /usr/libexec/myfilter
, that accepts
entire message as its output and produces on standard output a
modified version of this message. The program takes as its argument
he name of a directory for temporary files. The following example
illustrates how to invoke this program:
BEGIN GUILE guile-load-program entire-msg.scm END SECTION RULE guile-process entire-msg-filter /usr/libexec/myfilter /tmp END |
Another function defined in this module is openssl-filter
:
This function is provided for use with openssl
program. Openssl
binary attempts to rewind its input and
fails if the latter is a pipe, so openssl
cannot be used
with entire-msg-filter
. Instead, you should use
openssl-filter
. Its arguments are:
openssl
binary.
See section 10. Using S/MIME Signatures, for an example of use of this function.