redirect.scm
3.06 KB
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;;;; GNU mailutils - a suite of utilities for electronic mail
;;;; Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
;;;;
;;;; This program is free software; you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation; either version 2, or (at your option)
;;;; any later version.
;;;;
;;;; This program is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;;; GNU General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU General Public License
;;;; along with this program; if not, write to the Free Software
;;;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;;;; This module provides sieve's "redirect" action.
(use-modules (ice-9 popen))
(define PATH-SENDMAIL "/usr/lib/sendmail")
(define sieve-my-email "")
;;; Bounce a message.
;;; Current mailutils API does not provide a way to send a message
;;; specifying its recipients (like "sendmail -t foo@bar.org" does),
;;; hence the need for this function.
(define (sieve-message-bounce message addr-list)
(catch #t
(lambda ()
(let ((port (open-output-pipe
(apply string-append
(append
(list
PATH-SENDMAIL
" -oi -t ")
(map
(lambda (addr)
(string-append addr " "))
addr-list))))))
;; Write headers
(for-each
(lambda (hdr)
(display (string-append (car hdr) ": " (cdr hdr)) port)
(newline port))
(mu-message-get-header-fields message))
(newline port)
;; Write body
(let ((body (mu-message-get-body message)))
(do ((line (mu-body-read-line body) (mu-body-read-line body)))
((eof-object? line) #f)
(display line port)))
(close-output-port port)))
(lambda args
(runtime-error LOG_ERR "redirect: Can't send message")
(write args))))
;;; rfc3028 says:
;;; "Implementations SHOULD take measures to implement loop control,"
;;; We do this by appending an "X-Sender" header to each message
;;; being redirected. If one of the "X-Sender" headers of the message
;;; contains our email address, we assume it is a loop and bail out.
(define (sent-from-me? msg)
(call-with-current-continuation
(lambda (x)
(for-each
(lambda (hdr)
(if (and (string=? (car hdr) "X-Sender")
(string=? (mu-address-get-email (cdr hdr))
sieve-my-email))
(x #t)))
(mu-message-get-header-fields sieve-current-message))
#f)))
;;; redirect action
(define (action-redirect address)
(if sieve-my-email
(cond
((sent-from-me? sieve-current-message)
(runtime-error LOG_ERR "redirect: Loop detected"))
(else
(let ((out-msg (mu-message-copy sieve-current-message)))
(mu-message-set-header out-msg "X-Sender" sieve-my-email)
(sieve-message-bounce out-msg (list address)))))
(sieve-message-bounce out-msg (list address))))
;;; Register action
(if sieve-parser
(sieve-register-action "redirect" action-redirect 'string))