/usr/share/emacs/site-lisp/flim/smtp.el is in flim 1:1.14.9+0.20110516-1.
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;; Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001 ,2002, 2004
;; Free Software Foundation, Inc.
;; Author: Tomoji Kagatani <kagatani@rbc.ncl.omron.co.jp>
;; Simon Leinen <simon@switch.ch> (ESMTP support)
;; Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
;; Daiki Ueno <ueno@unixuser.org>
;; Keywords: SMTP, mail
;; This file is part of FLIM (Faithful Library about Internet Message).
;; 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; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;
;;; Code:
(require 'custom)
(require 'mail-utils) ; mail-strip-quoted-names
(require 'sasl)
(require 'luna)
(require 'mel) ; binary-funcall
(defgroup smtp nil
"SMTP protocol for sending mail."
:group 'mail)
(defgroup smtp-extensions nil
"SMTP service extensions (RFC1869)."
:group 'smtp)
(defcustom smtp-default-server nil
"Specify default SMTP server."
:type '(choice (const nil) string)
:group 'smtp)
(defcustom smtp-server (or (getenv "SMTPSERVER") smtp-default-server)
"The name of the host running SMTP server.
It can also be a function
called from `smtp-via-smtp' with arguments SENDER and RECIPIENTS."
:type '(choice (string :tag "Name")
(function :tag "Function"))
:group 'smtp)
(defcustom smtp-send-by-myself nil
"If non-nil, smtp.el send a mail by myself without smtp-server.
This option requires \"dig.el\"."
:type 'boolean
:group 'smtp)
(defcustom smtp-service "smtp"
"SMTP service port number. \"smtp\" or 25."
:type '(choice (integer :tag "25" 25)
(string :tag "smtp" "smtp"))
:group 'smtp)
(defcustom smtp-local-domain nil
"Local domain name without a host name.
If the function (system-name) returns the full internet address,
don't define this value."
:type '(choice (const nil) string)
:group 'smtp)
(defcustom smtp-fqdn nil
"Fully qualified domain name used for Message-ID."
:type '(choice (const nil) string)
:group 'smtp)
(defcustom smtp-use-8bitmime t
"If non-nil, use ESMTP 8BITMIME (RFC1652) if available."
:type 'boolean
:group 'smtp-extensions)
(defcustom smtp-use-size t
"If non-nil, use ESMTP SIZE (RFC1870) if available."
:type 'boolean
:group 'smtp-extensions)
(defcustom smtp-use-starttls nil
"If non-nil, use STARTTLS (RFC2595) if available."
:type 'boolean
:group 'smtp-extensions)
(defcustom smtp-use-starttls-ignore-error nil
"If non-nil, do not use STARTTLS if STARTTLS is not available."
:type 'boolean
:group 'smtp-extensions)
(defcustom smtp-starttls-program "starttls"
"The program to run in a subprocess to open an TLSv1 connection."
:group 'smtp-extensions)
(defcustom smtp-starttls-extra-args nil
"Extra arguments to `starttls-program'"
:group 'smtp-extensions)
(defcustom smtp-use-sasl nil
"If non-nil, use SMTP Authentication (RFC2554) if available."
:type 'boolean
:group 'smtp-extensions)
(defcustom smtp-sasl-user-name (user-login-name)
"Identification to be used for authorization."
:type 'string
:group 'smtp-extensions)
(defcustom smtp-sasl-properties nil
"Properties set to SASL client."
:type 'string
:group 'smtp-extensions)
(defcustom smtp-sasl-mechanisms nil
"List of authentication mechanisms."
:type '(repeat string)
:group 'smtp-extensions)
(defcustom smtp-debug nil
"*If non-nil, smtp debug info printout into messages."
:type 'boolean
:group 'smtp)
(defvar sasl-mechanisms)
;;;###autoload
(defvar smtp-open-connection-function #'open-network-stream
"*Function used for connecting to a SMTP server.
The function will be called with the same four arguments as
`open-network-stream' and should return a process object.
Here is an example:
\(setq smtp-open-connection-function
#'(lambda (name buffer host service)
(let ((process-connection-type nil))
(start-process name buffer \"ssh\" \"-C\" host
\"nc\" host service))))
It connects to a SMTP server using \"ssh\" before actually connecting
to the SMTP port. Where the command \"nc\" is the netcat executable;
see http://www.atstake.com/research/tools/index.html#network_utilities
for details.")
(defvar smtp-read-point nil)
(defvar smtp-connection-alist nil)
(defvar smtp-submit-package-function #'smtp-submit-package)
;;; @ SMTP package
;;; A package contains a mail message, an envelope sender address,
;;; and one or more envelope recipient addresses. In ESMTP model
;;; the current sending package should be guaranteed to be accessible
;;; anywhere from the hook methods (or SMTP commands).
(eval-and-compile
(luna-define-class smtp-package ()
(sender
recipients
buffer))
(luna-define-internal-accessors 'smtp-package))
(defun smtp-make-package (sender recipients buffer)
"Create a new package structure.
A package is a unit of SMTP message
SENDER specifies the package sender, a string.
RECIPIENTS is a list of recipients.
BUFFER may be a buffer or a buffer name which contains mail message."
(luna-make-entity 'smtp-package :sender sender :recipients recipients :buffer buffer))
(defun smtp-package-buffer-internal-size (package)
"Return the size of PACKAGE, an integer."
(save-excursion
(set-buffer (smtp-package-buffer-internal package))
(let ((size
(+ (buffer-size)
;; Add one byte for each change-of-line
;; because or CR-LF representation:
(count-lines (point-min) (point-max))
;; For some reason, an empty line is
;; added to the message. Maybe this
;; is a bug, but it can't hurt to add
;; those two bytes anyway:
2)))
(goto-char (point-min))
(while (re-search-forward "^\\." nil t)
(setq size (1+ size)))
size)))
;;; @ SMTP connection
;;; We should consider the function `open-network-stream' is a emulation
;;; for another network stream. They are likely to be implemented with an
;;; external program and the function `process-contact' returns the
;;; process id instead of `(HOST SERVICE)' pair.
(eval-and-compile
(luna-define-class smtp-connection ()
(process
server
service
extensions
encoder
decoder))
(luna-define-internal-accessors 'smtp-connection))
(defun smtp-make-connection (process server service)
"Create a new connection structure.
PROCESS is an internal subprocess-object. SERVER is name of the host
to connect to. SERVICE is name of the service desired."
(luna-make-entity 'smtp-connection :process process :server server :service service))
(luna-define-generic smtp-connection-opened (connection)
"Say whether the CONNECTION to server has been opened.")
(luna-define-generic smtp-close-connection (connection)
"Close the CONNECTION to server.")
(luna-define-method smtp-connection-opened ((connection smtp-connection))
(let ((process (smtp-connection-process-internal connection)))
(if (memq (process-status process) '(open run))
t)))
(luna-define-method smtp-close-connection ((connection smtp-connection))
(let ((process (smtp-connection-process-internal connection)))
(delete-process process)))
(defun smtp-make-fqdn ()
"Return user's fully qualified domain name."
(if smtp-fqdn
smtp-fqdn
(let ((system-name (system-name)))
(cond
(smtp-local-domain
(concat system-name "." smtp-local-domain))
((string-match "[^.]\\.[^.]" system-name)
system-name)
(t
(error "Cannot generate valid FQDN"))))))
(defun smtp-find-connection (buffer)
"Find the connection delivering to BUFFER."
(let ((entry (assq buffer smtp-connection-alist))
connection)
(when entry
(setq connection (nth 1 entry))
(if (smtp-connection-opened connection)
connection
(setq smtp-connection-alist
(delq entry smtp-connection-alist))
nil))))
(eval-and-compile
(autoload 'starttls-open-stream "starttls")
(autoload 'starttls-negotiate "starttls"))
(defun smtp-open-connection (buffer server service)
"Open a SMTP connection for a service to a host.
Return a newly allocated connection-object.
BUFFER is the buffer to associate with the connection. SERVER is name
of the host to connect to. SERVICE is name of the service desired."
(let ((process
(binary-funcall smtp-open-connection-function
"SMTP" buffer server service))
connection)
(when process
(setq connection (smtp-make-connection process server service))
(set-process-filter process 'smtp-process-filter)
(setq smtp-connection-alist
(cons (list buffer connection)
smtp-connection-alist))
connection)))
(eval-and-compile
(autoload 'dig-invoke "dig")
(autoload 'dig-extract-rr "dig"))
(defun smtp-find-mx (domain &optional doerror)
(let (server)
;; dig.el resolves only primally MX.
(cond ((setq server (smtp-dig domain "MX"))
(progn (string-match " \\([^ ]*\\)$" server)
(match-string 1 server)))
((smtp-dig domain "A")
domain)
(t
(if doerror
(error (format "SMTP cannot resolve %s" domain)))))))
(defun smtp-dig (domain type)
(let (dig-buf)
(set-buffer
(setq dig-buf (dig-invoke domain type)))
(prog1
(dig-extract-rr domain type)
(kill-buffer dig-buf))))
(defun smtp-find-server (recipients)
(save-excursion
(let ((rec
(mapcar (lambda (recipient)
(let (server)
(if (and (string-match "@\\([^\t\n ]*\\)" recipient)
(setq server
(smtp-find-mx
(match-string 1 recipient))))
(cons server (list recipient))
(error (format "cannot find server for %s." recipient)))))
recipients))
ret rets rlist)
(while (setq rets (pop rec))
(if (setq ret (assoc (car rets) rec))
(setcdr ret
(append (cdr ret) (cdr rets)))
(setq rlist
(append rlist (list rets)))))
rlist)))
;;;###autoload
(defun smtp-via-smtp (sender recipients buffer)
"Like `smtp-send-buffer', but sucks in any errors."
(condition-case nil
(progn
(smtp-send-buffer sender recipients buffer)
t)
(smtp-error)))
(make-obsolete 'smtp-via-smtp "It's old API.")
;;;###autoload
(defun smtp-send-buffer (sender recipients buffer)
"Send a message.
SENDER is an envelope sender address.
RECIPIENTS is a list of envelope recipient addresses.
BUFFER may be a buffer or a buffer name which contains mail message."
(if smtp-send-by-myself
(smtp-send-buffer-by-myself sender recipients buffer)
(let* ((server
(if (functionp smtp-server)
(funcall smtp-server sender recipients)
(or smtp-server
(error "`smtp-server' not defined"))))
(package
(smtp-make-package sender recipients buffer))
(starttls-program smtp-starttls-program)
(starttls-extra-args smtp-starttls-extra-args)
(smtp-open-connection-function
(if smtp-use-starttls
#'starttls-open-stream
smtp-open-connection-function)))
(save-excursion
(set-buffer
(get-buffer-create
(format "*trace of SMTP session to %s*" server)))
(erase-buffer)
(buffer-disable-undo)
(unless (smtp-find-connection (current-buffer))
(smtp-open-connection (current-buffer) server smtp-service))
(make-local-variable 'smtp-read-point)
(setq smtp-read-point (point-min))
(funcall smtp-submit-package-function package)))))
(defun smtp-submit-package (package)
(unwind-protect
(progn
(smtp-primitive-greeting package)
(condition-case nil
(smtp-primitive-ehlo package)
(smtp-response-error
(smtp-primitive-helo package)))
(if smtp-use-starttls
(if (assq 'starttls
(smtp-connection-extensions-internal
(smtp-find-connection (current-buffer))))
(progn
(smtp-primitive-starttls package)
(smtp-primitive-ehlo package))
(unless smtp-use-starttls-ignore-error
(error "STARTTLS is not supported on this server"))))
(if smtp-use-sasl
(smtp-primitive-auth package))
(smtp-primitive-mailfrom package)
(smtp-primitive-rcptto package)
(smtp-primitive-data package))
(let ((connection (smtp-find-connection (current-buffer))))
(when (and connection (smtp-connection-opened connection))
(condition-case nil
(smtp-primitive-quit package)
(smtp-error))
(smtp-close-connection connection)))))
(defun smtp-send-buffer-by-myself (sender recipients buffer)
"Send a message by myself.
SENDER is an envelope sender address.
RECIPIENTS is a list of envelope recipient addresses.
BUFFER may be a buffer or a buffer name which contains mail message."
(let ((servers
(smtp-find-server recipients))
(smtp-open-connection-function
(if smtp-use-starttls
#'starttls-open-stream
smtp-open-connection-function))
server package)
(while (car servers)
(setq server (caar servers))
(setq recipients (cdar servers))
(if (not (and server recipients))
;; MAILER-DAEMON is required. :)
(error (format "Cannot send <%s>"
(mapconcat 'concat recipients ">,<"))))
(setq package
(smtp-make-package sender recipients buffer))
(save-excursion
(set-buffer
(get-buffer-create
(format "*trace of SMTP session to %s*" server)))
(erase-buffer)
(buffer-disable-undo)
(unless (smtp-find-connection (current-buffer))
(smtp-open-connection (current-buffer) server smtp-service))
(make-local-variable 'smtp-read-point)
(setq smtp-read-point (point-min))
(let ((smtp-use-sasl nil)
(smtp-use-starttls-ignore-error t))
(funcall smtp-submit-package-function package)))
(setq servers (cdr servers)))))
;;; @ hook methods for `smtp-submit-package'
;;;
(defun smtp-primitive-greeting (package)
(let* ((connection
(smtp-find-connection (current-buffer)))
(response
(smtp-read-response connection)))
(if (/= (car response) 220)
(smtp-response-error response))))
(defun smtp-primitive-ehlo (package)
(let* ((connection
(smtp-find-connection (current-buffer)))
response)
(smtp-send-command connection (format "EHLO %s" (smtp-make-fqdn)))
(setq response (smtp-read-response connection))
(if (/= (car response) 250)
(smtp-response-error response))
(smtp-connection-set-extensions-internal
connection (mapcar
(lambda (extension)
(let ((extensions
(split-string extension)))
(setcar extensions
(car (read-from-string
(downcase (car extensions)))))
extensions))
(cdr response)))))
(defun smtp-primitive-helo (package)
(let* ((connection
(smtp-find-connection (current-buffer)))
response)
(smtp-send-command connection (format "HELO %s" (smtp-make-fqdn)))
(setq response (smtp-read-response connection))
(if (/= (car response) 250)
(smtp-response-error response))))
(defun smtp-primitive-auth (package)
(let* ((connection
(smtp-find-connection (current-buffer)))
(mechanisms
(cdr (assq 'auth (smtp-connection-extensions-internal connection))))
(sasl-mechanisms
(or smtp-sasl-mechanisms sasl-mechanisms))
(mechanism
(sasl-find-mechanism mechanisms))
client
name
step
response)
(unless mechanism
(error "No authentication mechanism available"))
(setq client (sasl-make-client mechanism smtp-sasl-user-name "smtp"
(smtp-connection-server-internal connection)))
(if smtp-sasl-properties
(sasl-client-set-properties client smtp-sasl-properties))
(setq name (sasl-mechanism-name mechanism)
;; Retrieve the initial response
step (sasl-next-step client nil))
(smtp-send-command
connection
(if (sasl-step-data step)
(format "AUTH %s %s" name (base64-encode-string (sasl-step-data step) t))
(format "AUTH %s" name)))
(catch 'done
(while t
(setq response (smtp-read-response connection))
(when (= (car response) 235)
;; The authentication process is finished.
(setq step (sasl-next-step client step))
(if (null step)
(throw 'done nil))
(smtp-response-error response)) ;Bogus server?
(if (/= (car response) 334)
(smtp-response-error response))
(sasl-step-set-data step (base64-decode-string (nth 1 response)))
(setq step (sasl-next-step client step))
(smtp-send-command
connection
(if (sasl-step-data step)
(base64-encode-string (sasl-step-data step) t)
""))))
;;; (smtp-connection-set-encoder-internal
;;; connection (sasl-client-encoder client))
;;; (smtp-connection-set-decoder-internal
;;; connection (sasl-client-decoder client))
))
(defun smtp-primitive-starttls (package)
(let* ((connection
(smtp-find-connection (current-buffer)))
response)
;; STARTTLS --- begin a TLS negotiation (RFC 2595)
(smtp-send-command connection "STARTTLS")
(setq response (smtp-read-response connection))
(if (/= (car response) 220)
(smtp-response-error response))
(starttls-negotiate (smtp-connection-process-internal connection))))
(defun smtp-primitive-mailfrom (package)
(let* ((connection
(smtp-find-connection (current-buffer)))
(extensions
(smtp-connection-extensions-internal
connection))
(sender
(smtp-package-sender-internal package))
extension
response)
;; SIZE --- Message Size Declaration (RFC1870)
(if (and smtp-use-size
(assq 'size extensions))
(setq extension (format " SIZE=%d" (smtp-package-buffer-internal-size package))))
;; 8BITMIME --- 8bit-MIMEtransport (RFC1652)
(if (and smtp-use-8bitmime
(assq '8bitmime extensions))
(setq extension (concat extension " BODY=8BITMIME")))
(smtp-send-command
connection
(if extension
(format "MAIL FROM:<%s>%s" sender extension)
(format "MAIL FROM:<%s>" sender)))
(setq response (smtp-read-response connection))
(if (/= (car response) 250)
(smtp-response-error response))))
(defun smtp-primitive-rcptto (package)
(let* ((connection
(smtp-find-connection (current-buffer)))
(recipients
(smtp-package-recipients-internal package))
response)
(while recipients
(smtp-send-command
connection (format "RCPT TO:<%s>" (pop recipients)))
(setq response (smtp-read-response connection))
(unless (memq (car response) '(250 251))
(smtp-response-error response)))))
(defun smtp-primitive-data (package)
(let* ((connection
(smtp-find-connection (current-buffer)))
response)
(smtp-send-command connection "DATA")
(setq response (smtp-read-response connection))
(if (/= (car response) 354)
(smtp-response-error response))
(save-excursion
(set-buffer (smtp-package-buffer-internal package))
(goto-char (point-min))
(while (not (eobp))
(smtp-send-data
connection (buffer-substring (point) (progn (end-of-line)(point))))
(beginning-of-line 2)))
(smtp-send-command connection ".")
(setq response (smtp-read-response connection))
(if (/= (car response) 250)
(smtp-response-error response))))
(defun smtp-primitive-quit (package)
(let* ((connection
(smtp-find-connection (current-buffer)))
response)
(smtp-send-command connection "QUIT")
(setq response (smtp-read-response connection))
(if (/= (car response) 221)
(smtp-response-error response))))
;;; @ low level process manipulating function
;;;
(defun smtp-process-filter (process output)
(save-excursion
(set-buffer (process-buffer process))
(goto-char (point-max))
(insert output)))
(put 'smtp-error 'error-message "SMTP error")
(put 'smtp-error 'error-conditions '(smtp-error error))
(put 'smtp-response-error 'error-message "SMTP response error")
(put 'smtp-response-error 'error-conditions '(smtp-response-error smtp-error error))
(defun smtp-response-error (response)
(signal 'smtp-response-error response))
(defun smtp-read-response (connection)
(let ((decoder
(smtp-connection-decoder-internal connection))
(response-continue t)
response)
(while response-continue
(goto-char smtp-read-point)
(while (not (re-search-forward "\r?\n" nil t))
(unless (smtp-connection-opened connection)
(signal 'smtp-error "Connection closed"))
(accept-process-output (smtp-connection-process-internal connection))
(goto-char smtp-read-point))
(let ((bol smtp-read-point)
(eol (match-beginning 0)))
(when decoder
(let ((string (buffer-substring bol eol)))
(delete-region bol (point))
(insert (funcall decoder string))
(setq eol (point))
(insert "\r\n")))
(setq smtp-read-point (point))
(goto-char bol)
(cond
((looking-at "[1-5][0-9][0-9]\\([ -]\\)")
(setq response
(nconc response
(list (buffer-substring (match-end 0) eol))))
(when (string= (match-string 1) " ")
(setq response (cons (read (point-marker)) response)
response-continue nil)))
(smtp-debug
(message "Invalid response: %s" (buffer-substring bol eol))))))
response))
(defun smtp-send-command (connection command)
(save-excursion
(let ((process
(smtp-connection-process-internal connection))
(encoder
(smtp-connection-encoder-internal connection)))
(set-buffer (process-buffer process))
(goto-char (point-max))
(setq command (concat command "\r\n"))
(insert command)
(setq smtp-read-point (point))
(if encoder
(setq command (funcall encoder command)))
(process-send-string process command))))
(defun smtp-send-data (connection data)
(let ((process
(smtp-connection-process-internal connection))
(encoder
(smtp-connection-encoder-internal connection)))
;; Escape "." at start of a line.
(if (eq (string-to-char data) ?.)
(setq data (concat "." data "\r\n"))
(setq data (concat data "\r\n")))
(if encoder
(setq data (funcall encoder data)))
(process-send-string process data)))
(defun smtp-deduce-address-list (smtp-text-buffer header-start header-end)
"Get address list suitable for smtp RCPT TO:<address>."
(let ((simple-address-list "")
this-line
this-line-end
addr-regexp
(smtp-address-buffer (generate-new-buffer " *smtp-mail*")))
(unwind-protect
(save-excursion
;;
(set-buffer smtp-address-buffer)
(setq case-fold-search t)
(erase-buffer)
(insert (save-excursion
(set-buffer smtp-text-buffer)
(buffer-substring-no-properties header-start header-end)))
(goto-char (point-min))
;; RESENT-* fields should stop processing of regular fields.
(save-excursion
(if (re-search-forward "^RESENT-TO:" header-end t)
(setq addr-regexp
"^\\(RESENT-TO:\\|RESENT-CC:\\|RESENT-BCC:\\)")
(setq addr-regexp "^\\(TO:\\|CC:\\|BCC:\\)")))
(while (re-search-forward addr-regexp header-end t)
(replace-match "")
(setq this-line (match-beginning 0))
(forward-line 1)
;; get any continuation lines.
(while (and (looking-at "^[ \t]+") (< (point) header-end))
(forward-line 1))
(setq this-line-end (point-marker))
(setq simple-address-list
(concat simple-address-list " "
(mail-strip-quoted-names
(buffer-substring this-line this-line-end)))))
(erase-buffer)
(insert " " simple-address-list "\n")
;; newline --> blank
(subst-char-in-region (point-min) (point-max) 10 ? t)
;; comma --> blank
(subst-char-in-region (point-min) (point-max) ?, ? t)
;; tab --> blank
(subst-char-in-region (point-min) (point-max) 9 ? t)
(goto-char (point-min))
;; tidyness in case hook is not robust when it looks at this
(while (re-search-forward "[ \t]+" header-end t) (replace-match " "))
(goto-char (point-min))
(let (recipient-address-list)
(while (re-search-forward " \\([^ ]+\\) " (point-max) t)
(backward-char 1)
(setq recipient-address-list
(cons (buffer-substring (match-beginning 1) (match-end 1))
recipient-address-list)))
recipient-address-list))
(kill-buffer smtp-address-buffer))))
(provide 'smtp)
;;; smtp.el ends here
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