1 ;;; smtp.el --- basic functions to send mail with SMTP server
3 ;; Copyright (C) 1995, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
5 ;; Author: Tomoji Kagatani <kagatani@rbc.ncl.omron.co.jp>
6 ;; Simon Leinen <simon@switch.ch> (ESMTP support)
7 ;; Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
8 ;; Daiki Ueno <ueno@unixuser.org>
9 ;; Keywords: SMTP, mail
11 ;; This file is part of FLIM (Faithful Library about Internet Message).
13 ;; This program is free software; you can redistribute it and/or
14 ;; modify it under the terms of the GNU General Public License as
15 ;; published by the Free Software Foundation; either version 2, or (at
16 ;; your option) any later version.
18 ;; This program is distributed in the hope that it will be useful, but
19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 ;; General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with this program; see the file COPYING. If not, write to the
25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
26 ;; Boston, MA 02111-1307, USA.
35 (require 'mail-utils) ; mail-strip-quoted-names
38 (require 'mel) ; binary-funcall
41 "SMTP protocol for sending mail."
44 (defgroup smtp-extensions nil
45 "SMTP service extensions (RFC1869)."
48 (defcustom smtp-default-server nil
49 "Specify default SMTP server."
50 :type '(choice (const nil) string)
53 (defcustom smtp-server (or (getenv "SMTPSERVER") smtp-default-server)
54 "The name of the host running SMTP server.
55 It can also be a function
56 called from `smtp-via-smtp' with arguments SENDER and RECIPIENTS."
57 :type '(choice (string :tag "Name")
58 (function :tag "Function"))
61 (defcustom smtp-service "smtp"
62 "SMTP service port number. \"smtp\" or 25."
63 :type '(choice (integer :tag "25" 25)
64 (string :tag "smtp" "smtp"))
67 (defcustom smtp-local-domain nil
68 "Local domain name without a host name.
69 If the function (system-name) returns the full internet address,
70 don't define this value."
71 :type '(choice (const nil) string)
74 (defcustom smtp-fqdn nil
75 "Fully qualified domain name used for Message-ID."
76 :type '(choice (const nil) string)
79 (defcustom smtp-use-8bitmime t
80 "If non-nil, use ESMTP 8BITMIME (RFC1652) if available."
82 :group 'smtp-extensions)
84 (defcustom smtp-use-size t
85 "If non-nil, use ESMTP SIZE (RFC1870) if available."
87 :group 'smtp-extensions)
89 (defcustom smtp-use-starttls nil
90 "If non-nil, use STARTTLS (RFC2595) if available."
92 :group 'smtp-extensions)
94 (defcustom smtp-use-sasl nil
95 "If non-nil, use SMTP Authentication (RFC2554) if available."
97 :group 'smtp-extensions)
99 (defcustom smtp-sasl-user-name (user-login-name)
100 "Identification to be used for authorization."
102 :group 'smtp-extensions)
104 (defcustom smtp-sasl-properties nil
105 "Properties set to SASL client."
107 :group 'smtp-extensions)
109 (defcustom smtp-sasl-mechanisms nil
110 "List of authentication mechanisms."
111 :type '(repeat string)
112 :group 'smtp-extensions)
114 (defvar sasl-mechanisms)
117 (defvar smtp-open-connection-function #'open-network-stream)
119 (defvar smtp-read-point nil)
121 (defvar smtp-connection-alist nil)
123 (defvar smtp-submit-package-function #'smtp-submit-package)
126 ;;; A package contains a mail message, an envelope sender address,
127 ;;; and one or more envelope recipient addresses. In ESMTP model
128 ;;; the current sending package should be guaranteed to be accessible
129 ;;; anywhere from the hook methods (or SMTP commands).
132 (luna-define-class smtp-package ()
137 (luna-define-internal-accessors 'smtp-package))
139 (defun smtp-make-package (sender recipients buffer)
140 "Create a new package structure.
141 A package is a unit of SMTP message
142 SENDER specifies the package sender, a string.
143 RECIPIENTS is a list of recipients.
144 BUFFER may be a buffer or a buffer name which contains mail message."
145 (luna-make-entity 'smtp-package :sender sender :recipients recipients :buffer buffer))
147 (defun smtp-package-buffer-internal-size (package)
148 "Return the size of PACKAGE, an integer."
150 (set-buffer (smtp-package-buffer-internal package))
153 ;; Add one byte for each change-of-line
154 ;; because or CR-LF representation:
155 (count-lines (point-min) (point-max))
156 ;; For some reason, an empty line is
157 ;; added to the message. Maybe this
158 ;; is a bug, but it can't hurt to add
159 ;; those two bytes anyway:
161 (goto-char (point-min))
162 (while (re-search-forward "^\\." nil t)
163 (setq size (1+ size)))
166 ;;; @ SMTP connection
167 ;;; We should consider the function `open-network-stream' is a emulation
168 ;;; for another network stream. They are likely to be implemented with an
169 ;;; external program and the function `process-contact' returns the
170 ;;; process id instead of `(HOST SERVICE)' pair.
173 (luna-define-class smtp-connection ()
181 (luna-define-internal-accessors 'smtp-connection))
183 (defun smtp-make-connection (process server service)
184 "Create a new connection structure.
185 PROCESS is an internal subprocess-object. SERVER is name of the host
186 to connect to. SERVICE is name of the service desired."
187 (luna-make-entity 'smtp-connection :process process :server server :service service))
189 (luna-define-generic smtp-connection-opened (connection)
190 "Say whether the CONNECTION to server has been opened.")
192 (luna-define-generic smtp-close-connection (connection)
193 "Close the CONNECTION to server.")
195 (luna-define-method smtp-connection-opened ((connection smtp-connection))
196 (let ((process (smtp-connection-process-internal connection)))
197 (if (memq (process-status process) '(open run))
200 (luna-define-method smtp-close-connection ((connection smtp-connection))
201 (let ((process (smtp-connection-process-internal connection)))
202 (delete-process process)))
204 (defun smtp-make-fqdn ()
205 "Return user's fully qualified domain name."
208 (let ((system-name (system-name)))
211 (concat system-name "." smtp-local-domain))
212 ((string-match "[^.]\\.[^.]" system-name)
215 (error "Cannot generate valid FQDN"))))))
217 (defun smtp-find-connection (buffer)
218 "Find the connection delivering to BUFFER."
219 (let ((entry (assq buffer smtp-connection-alist))
222 (setq connection (nth 1 entry))
223 (if (smtp-connection-opened connection)
225 (setq smtp-connection-alist
226 (delq entry smtp-connection-alist))
230 (autoload 'starttls-open-stream "starttls")
231 (autoload 'starttls-negotiate "starttls"))
233 (defun smtp-open-connection (buffer server service)
234 "Open a SMTP connection for a service to a host.
235 Return a newly allocated connection-object.
236 BUFFER is the buffer to associate with the connection. SERVER is name
237 of the host to connect to. SERVICE is name of the service desired."
239 (binary-funcall smtp-open-connection-function
240 "SMTP" buffer server service))
243 (setq connection (smtp-make-connection process server service))
244 (set-process-filter process 'smtp-process-filter)
245 (setq smtp-connection-alist
246 (cons (list buffer connection)
247 smtp-connection-alist))
251 (defun smtp-via-smtp (sender recipients buffer)
252 "Like `smtp-send-buffer', but sucks in any errors."
255 (smtp-send-buffer sender recipients buffer)
259 (make-obsolete 'smtp-via-smtp "It's old API.")
262 (defun smtp-send-buffer (sender recipients buffer)
264 SENDER is an envelope sender address.
265 RECIPIENTS is a list of envelope recipient addresses.
266 BUFFER may be a buffer or a buffer name which contains mail message."
268 (if (functionp smtp-server)
269 (funcall smtp-server sender recipients)
272 (smtp-make-package sender recipients buffer))
273 (smtp-open-connection-function
274 (if smtp-use-starttls
275 #'starttls-open-stream
276 smtp-open-connection-function)))
280 (format "*trace of SMTP session to %s*" server)))
282 (buffer-disable-undo)
283 (unless (smtp-find-connection (current-buffer))
284 (smtp-open-connection (current-buffer) server smtp-service))
285 (make-local-variable 'smtp-read-point)
286 (setq smtp-read-point (point-min))
287 (funcall smtp-submit-package-function package))))
289 (defun smtp-submit-package (package)
292 (smtp-primitive-greeting package)
294 (smtp-primitive-ehlo package)
296 (smtp-primitive-helo package)))
297 (if smtp-use-starttls
301 (smtp-connection-extensions-internal
302 (smtp-find-connection (current-buffer))))
303 (error "STARTTLS is not supported on this server"))
304 (smtp-primitive-starttls package)
305 (smtp-primitive-ehlo package)))
307 (smtp-primitive-auth package))
308 (smtp-primitive-mailfrom package)
309 (smtp-primitive-rcptto package)
310 (smtp-primitive-data package))
311 (let ((connection (smtp-find-connection (current-buffer))))
312 (when (smtp-connection-opened connection)
313 (smtp-primitive-quit package)
314 (smtp-close-connection connection)))))
316 ;;; @ hook methods for `smtp-submit-package'
319 (defun smtp-primitive-greeting (package)
321 (smtp-find-connection (current-buffer)))
323 (smtp-read-response connection)))
324 (if (/= (car response) 220)
325 (smtp-response-error response))))
327 (defun smtp-primitive-ehlo (package)
329 (smtp-find-connection (current-buffer)))
331 (smtp-send-command connection (format "EHLO %s" (smtp-make-fqdn)))
332 (setq response (smtp-read-response connection))
333 (if (/= (car response) 250)
334 (smtp-response-error response))
335 (smtp-connection-set-extensions-internal
339 (split-string extension)))
341 (car (read-from-string
342 (downcase (car extensions)))))
346 (defun smtp-primitive-helo (package)
348 (smtp-find-connection (current-buffer)))
350 (smtp-send-command connection (format "HELO %s" (smtp-make-fqdn)))
351 (setq response (smtp-read-response connection))
352 (if (/= (car response) 250)
353 (smtp-response-error response))))
355 (defun smtp-primitive-auth (package)
357 (smtp-find-connection (current-buffer)))
359 (cdr (assq 'auth (smtp-connection-extensions-internal connection))))
361 (or smtp-sasl-mechanisms sasl-mechanisms))
363 (sasl-find-mechanism mechanisms))
369 (error "No authentication mechanism available"))
370 (setq client (sasl-make-client mechanism smtp-sasl-user-name "smtp"
371 (smtp-connection-server-internal connection)))
372 (if smtp-sasl-properties
373 (sasl-client-set-properties client smtp-sasl-properties))
374 (setq name (sasl-mechanism-name mechanism)
375 ;; Retrieve the initial response
376 step (sasl-next-step client nil))
379 (if (sasl-step-data step)
380 (format "AUTH %s %s" name (base64-encode-string (sasl-step-data step) t))
381 (format "AUTH %s" name)))
384 (setq response (smtp-read-response connection))
385 (when (= (car response) 235)
386 ;; The authentication process is finished.
387 (setq step (sasl-next-step client step))
390 (smtp-response-error response)) ;Bogus server?
391 (if (/= (car response) 334)
392 (smtp-response-error response))
393 (sasl-step-set-data step (base64-decode-string (nth 1 response)))
394 (setq step (sasl-next-step client step))
397 (if (sasl-step-data step)
398 (base64-encode-string (sasl-step-data step) t)
400 ;;; (smtp-connection-set-encoder-internal
401 ;;; connection (sasl-client-encoder client))
402 ;;; (smtp-connection-set-decoder-internal
403 ;;; connection (sasl-client-decoder client))
406 (defun smtp-primitive-starttls (package)
408 (smtp-find-connection (current-buffer)))
410 ;; STARTTLS --- begin a TLS negotiation (RFC 2595)
411 (smtp-send-command connection "STARTTLS")
412 (setq response (smtp-read-response connection))
413 (if (/= (car response) 220)
414 (smtp-response-error response))
415 (starttls-negotiate (smtp-connection-process-internal connection))))
417 (defun smtp-primitive-mailfrom (package)
419 (smtp-find-connection (current-buffer)))
421 (smtp-connection-extensions-internal
424 (smtp-package-sender-internal package))
427 ;; SIZE --- Message Size Declaration (RFC1870)
428 (if (and smtp-use-size
429 (assq 'size extensions))
430 (setq extension (format "SIZE=%d" (smtp-package-buffer-internal-size package))))
431 ;; 8BITMIME --- 8bit-MIMEtransport (RFC1652)
432 (if (and smtp-use-8bitmime
433 (assq '8bitmime extensions))
434 (setq extension (concat extension " BODY=8BITMIME")))
438 (format "MAIL FROM:<%s> %s" sender extension)
439 (format "MAIL FROM:<%s>" sender)))
440 (setq response (smtp-read-response connection))
441 (if (/= (car response) 250)
442 (smtp-response-error response))))
444 (defun smtp-primitive-rcptto (package)
446 (smtp-find-connection (current-buffer)))
448 (smtp-package-recipients-internal package))
452 connection (format "RCPT TO:<%s>" (pop recipients)))
453 (setq response (smtp-read-response connection))
454 (unless (memq (car response) '(250 251))
455 (smtp-response-error response)))))
457 (defun smtp-primitive-data (package)
459 (smtp-find-connection (current-buffer)))
461 (smtp-send-command connection "DATA")
462 (setq response (smtp-read-response connection))
463 (if (/= (car response) 354)
464 (smtp-response-error response))
466 (set-buffer (smtp-package-buffer-internal package))
467 (goto-char (point-min))
470 connection (buffer-substring (point) (progn (end-of-line)(point))))
471 (beginning-of-line 2)))
472 (smtp-send-command connection ".")
473 (setq response (smtp-read-response connection))
474 (if (/= (car response) 250)
475 (smtp-response-error response))))
477 (defun smtp-primitive-quit (package)
479 (smtp-find-connection (current-buffer)))
481 (smtp-send-command connection "QUIT")
482 (setq response (smtp-read-response connection))
483 (if (/= (car response) 221)
484 (smtp-response-error response))))
486 ;;; @ low level process manipulating function
488 (defun smtp-process-filter (process output)
490 (set-buffer (process-buffer process))
491 (goto-char (point-max))
494 (put 'smtp-error 'error-message "SMTP error")
495 (put 'smtp-error 'error-conditions '(smtp-error error))
497 (put 'smtp-response-error 'error-message "SMTP response error")
498 (put 'smtp-response-error 'error-conditions '(smtp-response-error smtp-error error))
500 (defun smtp-response-error (response)
501 (signal 'smtp-response-error response))
503 (defun smtp-read-response (connection)
505 (smtp-connection-decoder-internal connection))
506 (response-continue t)
508 (while response-continue
509 (goto-char smtp-read-point)
510 (while (not (search-forward "\r\n" nil t))
511 (accept-process-output (smtp-connection-process-internal connection))
512 (goto-char smtp-read-point))
514 (let ((string (buffer-substring smtp-read-point (- (point) 2))))
515 (delete-region smtp-read-point (point))
516 (insert (funcall decoder string) "\r\n")))
519 (list (buffer-substring
520 (+ 4 smtp-read-point)
523 (prog1 smtp-read-point
524 (setq smtp-read-point (point))))
525 (if (looking-at "[1-5][0-9][0-9] ")
526 (setq response (cons (read (point-marker)) response)
527 response-continue nil)))
530 (defun smtp-send-command (connection command)
533 (smtp-connection-process-internal connection))
535 (smtp-connection-encoder-internal connection)))
536 (set-buffer (process-buffer process))
537 (goto-char (point-max))
538 (setq command (concat command "\r\n"))
540 (setq smtp-read-point (point))
542 (setq command (funcall encoder command)))
543 (process-send-string process command))))
545 (defun smtp-send-data (connection data)
547 (smtp-connection-process-internal connection))
549 (smtp-connection-encoder-internal connection)))
550 ;; Escape "." at start of a line.
551 (if (eq (string-to-char data) ?.)
552 (setq data (concat "." data "\r\n"))
553 (setq data (concat data "\r\n")))
555 (setq data (funcall encoder data)))
556 (process-send-string process data)))
558 (defun smtp-deduce-address-list (smtp-text-buffer header-start header-end)
559 "Get address list suitable for smtp RCPT TO:<address>."
560 (let ((simple-address-list "")
564 (smtp-address-buffer (generate-new-buffer " *smtp-mail*")))
568 (set-buffer smtp-address-buffer)
569 (setq case-fold-search t)
571 (insert (save-excursion
572 (set-buffer smtp-text-buffer)
573 (buffer-substring-no-properties header-start header-end)))
574 (goto-char (point-min))
575 ;; RESENT-* fields should stop processing of regular fields.
577 (if (re-search-forward "^RESENT-TO:" header-end t)
579 "^\\(RESENT-TO:\\|RESENT-CC:\\|RESENT-BCC:\\)")
580 (setq addr-regexp "^\\(TO:\\|CC:\\|BCC:\\)")))
582 (while (re-search-forward addr-regexp header-end t)
584 (setq this-line (match-beginning 0))
586 ;; get any continuation lines.
587 (while (and (looking-at "^[ \t]+") (< (point) header-end))
589 (setq this-line-end (point-marker))
590 (setq simple-address-list
591 (concat simple-address-list " "
592 (mail-strip-quoted-names
593 (buffer-substring this-line this-line-end)))))
596 (insert-string simple-address-list)
599 (subst-char-in-region (point-min) (point-max) 10 ? t)
601 (subst-char-in-region (point-min) (point-max) ?, ? t)
603 (subst-char-in-region (point-min) (point-max) 9 ? t)
605 (goto-char (point-min))
606 ;; tidyness in case hook is not robust when it looks at this
607 (while (re-search-forward "[ \t]+" header-end t) (replace-match " "))
609 (goto-char (point-min))
610 (let (recipient-address-list)
611 (while (re-search-forward " \\([^ ]+\\) " (point-max) t)
613 (setq recipient-address-list
614 (cons (buffer-substring (match-beginning 1) (match-end 1))
615 recipient-address-list)))
616 recipient-address-list))
617 (kill-buffer smtp-address-buffer))))
621 ;;; smtp.el ends here