lisp/mail/smtpmail.el

   1 ;;; smtpmail.el --- simple SMTP protocol (RFC 821) for sending mail
   2
   3 ;; Copyright (C) 1995, 1996, 2001 Free Software Foundation, Inc.
   4
   5 ;; Author: Tomoji Kagatani <kagatani@rbc.ncl.omron.co.jp>
   6 ;; Maintainer: Simon Josefsson <simon@josefsson.org>
   7 ;; w32 Maintainer: Brian D. Carlstrom <bdc@ai.mit.edu>
   8 ;; ESMTP support: Simon Leinen <simon@switch.ch>
   9 ;; Hacked by Mike Taylor, 11th October 1999 to add support for
  10 ;; automatically appending a domain to RCPT TO: addresses.
  11 ;; AUTH=LOGIN support: Stephen Cranefield <scranefield@infoscience.otago.ac.nz>
  12 ;; Keywords: mail
  13
  14 ;; This file is part of GNU Emacs.
  15
  16 ;; GNU Emacs is free software; you can redistribute it and/or modify
  17 ;; it under the terms of the GNU General Public License as published by
  18 ;; the Free Software Foundation; either version 2, or (at your option)
  19 ;; any later version.
  20
  21 ;; GNU Emacs is distributed in the hope that it will be useful,
  22 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 ;; GNU General Public License for more details.
  25
  26 ;; You should have received a copy of the GNU General Public License
  27 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  28 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  29 ;; Boston, MA 02111-1307, USA.
  30
  31 ;;; Commentary:
  32
  33 ;; Send Mail to smtp host from smtpmail temp buffer.
  34
  35 ;; Please add these lines in your .emacs(_emacs) or use customize.
  36 ;;
  37 ;;(setq send-mail-function 'smtpmail-send-it) ; if you use `mail'
  38 ;;(setq message-send-mail-function 'smtpmail-send-it) ; if you use message/Gnus
  39 ;;(setq smtpmail-default-smtp-server "YOUR SMTP HOST")
  40 ;;(setq smtpmail-local-domain "YOUR DOMAIN NAME")
  41 ;;(setq smtpmail-sendto-domain "YOUR DOMAIN NAME")
  42 ;;(setq smtpmail-debug-info t) ; only to debug problems
  43 ;;(setq smtpmail-auth-credentials  ; or use ~/.authinfo
  44 ;;      '(("YOUR SMTP HOST" 25 "username" "password")))
  45 ;;(setq smtpmail-starttls-credentials
  46 ;;      '(("YOUR SMTP HOST" 25 "~/.my_smtp_tls.key" "~/.my_smtp_tls.cert")))
  47
  48 ;; To queue mail, set smtpmail-queue-mail to t and use
  49 ;; smtpmail-send-queued-mail to send.
  50
  51 ;; Modified by Stephen Cranefield <scranefield@infoscience.otago.ac.nz>,
  52 ;; 22/6/99, to support SMTP Authentication by the AUTH=LOGIN mechanism.
  53 ;; See http://help.netscape.com/products/server/messaging/3x/info/smtpauth.html
  54 ;; Rewritten by Simon Josefsson to use same credential variable as AUTH
  55 ;; support below.
  56
  57 ;; Modified by Simon Josefsson <jas@pdc.kth.se>, 22/2/99, to support SMTP
  58 ;; Authentication by the AUTH mechanism.
  59 ;; See http://www.ietf.org/rfc/rfc2554.txt
  60
  61 ;; Modified by Simon Josefsson <simon@josefsson.org>, 2000-10-07, to support
  62 ;; STARTTLS.  Requires external program
  63 ;; ftp://ftp.opaopa.org/pub/elisp/starttls-*.tar.gz.
  64 ;; See http://www.ietf.org/rfc/rfc2246.txt, http://www.ietf.org/rfc/rfc2487.txt
  65
  66 ;;; Code:
  67
  68 (require 'sendmail)
  69 (require 'time-stamp)
  70 (autoload 'starttls-open-stream "starttls")
  71 (autoload 'starttls-negotiate "starttls")
  72 (autoload 'mail-strip-quoted-names "mail-utils")
  73 (autoload 'message-make-date "message")
  74 (autoload 'message-make-message-id "message")
  75 (autoload 'rfc2104-hash "rfc2104")
  76 (autoload 'netrc-parse "netrc")
  77 (autoload 'netrc-machine "netrc")
  78 (autoload 'netrc-get "netrc")
  79
  80 ;;;
  81 (defgroup smtpmail nil
  82   "SMTP protocol for sending mail."
  83   :group 'mail)
  84
  85
  86 (defcustom smtpmail-default-smtp-server nil
  87   "*Specify default SMTP server."
  88   :type '(choice (const nil) string)
  89   :group 'smtpmail)
  90
  91 (defcustom smtpmail-smtp-server
  92   (or (getenv "SMTPSERVER") smtpmail-default-smtp-server)
  93   "*The name of the host running SMTP server."
  94   :type '(choice (const nil) string)
  95   :group 'smtpmail)
  96
  97 (defcustom smtpmail-smtp-service 25
  98   "*SMTP service port number.
  99 The default value would be \"smtp\" or 25 ."
 100   :type '(choice (integer :tag "Port") (string :tag "Service"))
 101   :group 'smtpmail)
 102
 103 (defcustom smtpmail-local-domain nil
 104   "*Local domain name without a host name.
 105 If the function (system-name) returns the full internet address,
 106 don't define this value."
 107   :type '(choice (const nil) string)
 108   :group 'smtpmail)
 109
 110 (defcustom smtpmail-sendto-domain nil
 111   "*Local domain name without a host name.
 112 This is appended (with an @-sign) to any specified recipients which do
 113 not include an @-sign, so that each RCPT TO address is fully qualified.
 114 \(Some configurations of sendmail require this.)
 115
 116 Don't bother to set this unless you have get an error like:
 117         Sending failed; SMTP protocol error
 118 when sending mail, and the *trace of SMTP session to <somewhere>*
 119 buffer includes an exchange like:
 120         RCPT TO: <someone>
 121         501 <someone>: recipient address must contain a domain
 122 "
 123   :type '(choice (const nil) string)
 124   :group 'smtpmail)
 125
 126 (defcustom smtpmail-debug-info nil
 127   "Whether to print info in buffer *trace of SMTP session to <somewhere>*.
 128 See also `smtpmail-debug-verb' which determines if the SMTP protocol should
 129 be verbose as well."
 130   :type 'boolean
 131   :group 'smtpmail)
 132
 133 (defcustom smtpmail-debug-verb nil
 134   "Whether this library sends the SMTP VERB command or not.
 135 The commands enables verbose information from the SMTP server."
 136   :type 'boolean
 137   :group 'smtpmail)
 138
 139 (defcustom smtpmail-code-conv-from nil ;; *junet*
 140   "*smtpmail code convert from this code to *internal*..for tiny-mime.."
 141   :type 'boolean
 142   :group 'smtpmail)
 143
 144 (defcustom smtpmail-queue-mail nil
 145   "*Specify if mail is queued (if t) or sent immediately (if nil).
 146 If queued, it is stored in the directory `smtpmail-queue-dir'
 147 and sent with `smtpmail-send-queued-mail'."
 148   :type 'boolean
 149   :group 'smtpmail)
 150
 151 (defcustom smtpmail-queue-dir "~/Mail/queued-mail/"
 152   "*Directory where `smtpmail.el' stores queued mail."
 153   :type 'directory
 154   :group 'smtpmail)
 155
 156 (defcustom smtpmail-auth-credentials "~/.authinfo"
 157   "Specify username and password for servers, directly or via .netrc file.
 158 This variable can either be a filename pointing to a file in netrc(5)
 159 format, or list of four-element lists that contain, in order,
 160 `servername' (a string), `port' (an integer), `user' (a string) and
 161 `password' (a string, or nil to query the user when needed).  If you
 162 need to enter a `realm' too, add it to the user string, so that it
 163 looks like `user@realm'."
 164   :type '(choice file
 165                  (repeat (list (string  :tag "Server")
 166                        (integer :tag "Port")
 167                        (string  :tag "Username")
 168                        (choice (const :tag "Query when needed" nil)
 169                                        (string  :tag "Password")))))
 170   :version "21.4"
 171   :group 'smtpmail)
 172
 173 (defcustom smtpmail-starttls-credentials '(("" 25 "" ""))
 174   "Specify STARTTLS keys and certificates for servers.
 175 This is a list of four-element list with `servername' (a string),
 176 `port' (an integer), `key' (a filename) and `certificate' (a filename)."
 177   :type '(repeat (list (string  :tag "Server")
 178                        (integer :tag "Port")
 179                        (file    :tag "Key")
 180                        (file    :tag "Certificate")))
 181   :version "21.1"
 182   :group 'smtpmail)
 183
 184 (defcustom smtpmail-warn-about-unknown-extensions nil
 185   "*If set, print warnings about unknown SMTP extensions.
 186 This is mainly useful for development purposes, to learn about
 187 new SMTP extensions that might be useful to support."
 188   :type 'boolean
 189   :version "21.1"
 190   :group 'smtpmail)
 191
 192 (defvar smtpmail-queue-index-file "index"
 193   "File name of queued mail index,
 194 This is relative to `smtpmail-queue-dir'.")
 195
 196 (defvar smtpmail-address-buffer)
 197 (defvar smtpmail-recipient-address-list)
 198
 199 (defvar smtpmail-queue-counter 0)
 200
 201 ;; Buffer-local variable.
 202 (defvar smtpmail-read-point)
 203
 204 (defvar smtpmail-queue-index (concat smtpmail-queue-dir
 205                                      smtpmail-queue-index-file))
 206
 207 (defconst smtpmail-auth-supported '(cram-md5 login)
 208   "List of supported SMTP AUTH mechanisms.")
 209
 210 ;;;
 211 ;;;
 212 ;;;
 213
 214 (defvar smtpmail-mail-address nil
 215   "Value of `user-mail-address' in ambient buffer.")
 216
 217 ;;;###autoload
 218 (defun smtpmail-send-it ()
 219   (let ((errbuf (if mail-interactive
 220                     (generate-new-buffer " smtpmail errors")
 221                   0))
 222         (tembuf (generate-new-buffer " smtpmail temp"))
 223         (case-fold-search nil)
 224         delimline
 225         (mailbuf (current-buffer))
 226         (smtpmail-mail-address user-mail-address)
 227         (smtpmail-code-conv-from
 228          (if enable-multibyte-characters
 229              (let ((sendmail-coding-system smtpmail-code-conv-from))
 230                (select-message-coding-system)))))
 231     (unwind-protect
 232         (save-excursion
 233           (set-buffer tembuf)
 234           (erase-buffer)
 235           (insert-buffer-substring mailbuf)
 236           (goto-char (point-max))
 237           ;; require one newline at the end.
 238           (or (= (preceding-char) ?\n)
 239               (insert ?\n))
 240           ;; Change header-delimiter to be what sendmail expects.
 241           (mail-sendmail-undelimit-header)
 242           (setq delimline (point-marker))
 243 ;;        (sendmail-synch-aliases)
 244           (if mail-aliases
 245               (expand-mail-aliases (point-min) delimline))
 246           (goto-char (point-min))
 247           ;; ignore any blank lines in the header
 248           (while (and (re-search-forward "\n\n\n*" delimline t)
 249                       (< (point) delimline))
 250             (replace-match "\n"))
 251           (let ((case-fold-search t))
 252             ;; We used to process Resent-... headers here,
 253             ;; but it was not done properly, and the job
 254             ;; is done correctly in smtpmail-deduce-address-list.
 255             ;; Don't send out a blank subject line
 256             (goto-char (point-min))
 257             (if (re-search-forward "^Subject:\\([ \t]*\n\\)+\\b" delimline t)
 258                 (replace-match "")
 259               ;; This one matches a Subject just before the header delimiter.
 260               (if (and (re-search-forward "^Subject:\\([ \t]*\n\\)+" delimline t)
 261                        (= (match-end 0) delimline))
 262                   (replace-match "")))
 263             ;; Put the "From:" field in unless for some odd reason
 264             ;; they put one in themselves.
 265             (goto-char (point-min))
 266             (if (not (re-search-forward "^From:" delimline t))
 267                 (let* ((login smtpmail-mail-address)
 268                        (fullname (user-full-name)))
 269                   (cond ((eq mail-from-style 'angles)
 270                          (insert "From: " fullname)
 271                          (let ((fullname-start (+ (point-min) 6))
 272                                (fullname-end (point-marker)))
 273                            (goto-char fullname-start)
 274                            ;; Look for a character that cannot appear unquoted
 275                            ;; according to RFC 822.
 276                            (if (re-search-forward "[^- !#-'*+/-9=?A-Z^-~]"
 277                                                   fullname-end 1)
 278                                (progn
 279                                  ;; Quote fullname, escaping specials.
 280                                  (goto-char fullname-start)
 281                                  (insert "\"")
 282                                  (while (re-search-forward "[\"\\]"
 283                                                            fullname-end 1)
 284                                    (replace-match "\\\\\\&" t))
 285                                  (insert "\""))))
 286                          (insert " <" login ">\n"))
 287                         ((eq mail-from-style 'parens)
 288                          (insert "From: " login " (")
 289                          (let ((fullname-start (point)))
 290                            (insert fullname)
 291                            (let ((fullname-end (point-marker)))
 292                              (goto-char fullname-start)
 293                              ;; RFC 822 says \ and nonmatching parentheses
 294                              ;; must be escaped in comments.
 295                              ;; Escape every instance of ()\ ...
 296                              (while (re-search-forward "[()\\]" fullname-end 1)
 297                                (replace-match "\\\\\\&" t))
 298                              ;; ... then undo escaping of matching parentheses,
 299                              ;; including matching nested parentheses.
 300                              (goto-char fullname-start)
 301                              (while (re-search-forward
 302                                      "\\(\\=\\|[^\\]\\(\\\\\\\\\\)*\\)\\\\(\\(\\([^\\]\\|\\\\\\\\\\)*\\)\\\\)"
 303                                      fullname-end 1)
 304                                (replace-match "\\1(\\3)" t)
 305                                (goto-char fullname-start))))
 306                          (insert ")\n"))
 307                         ((null mail-from-style)
 308                          (insert "From: " login "\n")))))
 309             ;; Insert a `Message-Id:' field if there isn't one yet.
 310             (goto-char (point-min))
 311             (unless (re-search-forward "^Message-Id:" delimline t)
 312               (insert "Message-Id: " (message-make-message-id) "\n"))
 313             ;; Insert a `Date:' field if there isn't one yet.
 314             (goto-char (point-min))
 315             (unless (re-search-forward "^Date:" delimline t)
 316               (insert "Date: " (message-make-date) "\n"))
 317             ;; Insert an extra newline if we need it to work around
 318             ;; Sun's bug that swallows newlines.
 319             (goto-char (1+ delimline))
 320             (if (eval mail-mailer-swallows-blank-line)
 321                 (newline))
 322             ;; Find and handle any FCC fields.
 323             (goto-char (point-min))
 324             (if (re-search-forward "^FCC:" delimline t)
 325                 (mail-do-fcc delimline))
 326             (if mail-interactive
 327                 (with-current-buffer errbuf
 328                   (erase-buffer))))
 329           ;;
 330           ;;
 331           ;;
 332           (setq smtpmail-address-buffer (generate-new-buffer "*smtp-mail*"))
 333           (setq smtpmail-recipient-address-list
 334                     (smtpmail-deduce-address-list tembuf (point-min) delimline))
 335           (kill-buffer smtpmail-address-buffer)
 336
 337           (smtpmail-do-bcc delimline)
 338           ; Send or queue
 339           (if (not smtpmail-queue-mail)
 340               (if (not (null smtpmail-recipient-address-list))
 341                   (if (not (smtpmail-via-smtp
 342                             smtpmail-recipient-address-list tembuf))
 343                       (error "Sending failed; SMTP protocol error"))
 344                 (error "Sending failed; no recipients"))
 345             (let* ((file-data (concat
 346                                smtpmail-queue-dir
 347                                (concat (time-stamp-yyyy-mm-dd)
 348                                        "_" (time-stamp-hh:mm:ss)
 349                                        "_"
 350                                        (setq smtpmail-queue-counter
 351                                              (1+ smtpmail-queue-counter)))))
 352                       (file-elisp (concat file-data ".el"))
 353                    (buffer-data (create-file-buffer file-data))
 354                    (buffer-elisp (create-file-buffer file-elisp))
 355                    (buffer-scratch "*queue-mail*"))
 356               (with-current-buffer buffer-data
 357                 (erase-buffer)
 358                 (insert-buffer tembuf)
 359                 (write-file file-data)
 360                 (set-buffer buffer-elisp)
 361                 (erase-buffer)
 362                 (insert (concat
 363                          "(setq smtpmail-recipient-address-list '"
 364                          (prin1-to-string smtpmail-recipient-address-list)
 365                          ")\n"))
 366                 (write-file file-elisp)
 367                 (set-buffer (generate-new-buffer buffer-scratch))
 368                 (insert (concat file-data "\n"))
 369                 (append-to-file (point-min)
 370                                 (point-max)
 371                                 smtpmail-queue-index)
 372                 )
 373               (kill-buffer buffer-scratch)
 374               (kill-buffer buffer-data)
 375               (kill-buffer buffer-elisp))))
 376       (kill-buffer tembuf)
 377       (if (bufferp errbuf)
 378           (kill-buffer errbuf)))))
 379
 380 (defun smtpmail-send-queued-mail ()
 381   "Send mail that was queued as a result of setting `smtpmail-queue-mail'."
 382   (interactive)
 383   (with-temp-buffer
 384     ;;; Get index, get first mail, send it, update index, get second
 385     ;;; mail, send it, etc...
 386     (let ((file-msg ""))
 387       (insert-file-contents smtpmail-queue-index)
 388       (beginning-of-buffer)
 389       (while (not (eobp))
 390         (setq file-msg (buffer-substring (point) (line-end-position)))
 391         (load file-msg)
 392         ;; Insert the message literally: it is already encoded as per
 393         ;; the MIME headers, and code conversions might guess the
 394         ;; encoding wrongly.
 395         (with-temp-buffer
 396           (let ((coding-system-for-read 'no-conversion))
 397             (insert-file-contents file-msg))
 398           (if (not (null smtpmail-recipient-address-list))
 399               (if (not (smtpmail-via-smtp smtpmail-recipient-address-list
 400                                           (current-buffer)))
 401                   (error "Sending failed; SMTP protocol error"))
 402             (error "Sending failed; no recipients")))
 403         (delete-file file-msg)
 404         (delete-file (concat file-msg ".el"))
 405         (kill-line 1))
 406       (write-region (point-min) (point-max) smtpmail-queue-index))))
 407
 408 ;(defun smtpmail-via-smtp (host,port,sender,destination,smtpmail-text-buffer)
 409
 410 (defun smtpmail-fqdn ()
 411   (if smtpmail-local-domain
 412       (concat (system-name) "." smtpmail-local-domain)
 413     (system-name)))
 414
 415 (defsubst smtpmail-cred-server (cred)
 416   (nth 0 cred))
 417
 418 (defsubst smtpmail-cred-port (cred)
 419   (nth 1 cred))
 420
 421 (defsubst smtpmail-cred-key (cred)
 422   (nth 2 cred))
 423
 424 (defsubst smtpmail-cred-user (cred)
 425   (nth 2 cred))
 426
 427 (defsubst smtpmail-cred-cert (cred)
 428   (nth 3 cred))
 429
 430 (defsubst smtpmail-cred-passwd (cred)
 431   (nth 3 cred))
 432
 433 (defun smtpmail-find-credentials (cred server port)
 434   (catch 'done
 435     (let ((l cred) el)
 436       (while (setq el (pop l))
 437         (when (and (equal server (smtpmail-cred-server el))
 438                    (equal port (smtpmail-cred-port el)))
 439           (throw 'done el))))))
 440
 441 (defun smtpmail-maybe-append-domain (recipient)
 442   (if (or (not smtpmail-sendto-domain)
 443           (string-match "@" recipient))
 444       recipient
 445     (concat recipient "@" smtpmail-sendto-domain)))
 446
 447 (defun smtpmail-intersection (list1 list2)
 448   (let ((result nil))
 449     (dolist (el2 list2)
 450       (when (memq el2 list1)
 451         (push el2 result)))
 452     (nreverse result)))
 453
 454 (defun smtpmail-open-stream (process-buffer host port)
 455   (let ((cred (smtpmail-find-credentials
 456                smtpmail-starttls-credentials host port)))
 457     (if (null (and cred (condition-case ()
 458                             (call-process "starttls")
 459                           (error nil))))
 460         ;; The normal case.
 461         (open-network-stream "SMTP" process-buffer host port)
 462       (let* ((cred-key (smtpmail-cred-key cred))
 463              (cred-cert (smtpmail-cred-cert cred))
 464              (starttls-extra-args
 465               (when (and (stringp cred-key) (stringp cred-cert)
 466                          (file-regular-p
 467                           (setq cred-key (expand-file-name cred-key)))
 468                          (file-regular-p
 469                           (setq cred-cert (expand-file-name cred-cert))))
 470                 (list "--key-file" cred-key "--cert-file" cred-cert))))
 471         (starttls-open-stream "SMTP" process-buffer host port)))))
 472
 473 (defun smtpmail-try-auth-methods (process supported-extensions host port)
 474   (let* ((mechs (cdr-safe (assoc 'auth supported-extensions)))
 475          (mech (car (smtpmail-intersection smtpmail-auth-supported mechs)))
 476          (cred (if (stringp smtpmail-auth-credentials)
 477                    (let* ((netrc (netrc-parse smtpmail-auth-credentials))
 478                           (hostentry (netrc-machine
 479                                       netrc host (format "%s" (or port "smtp"))
 480                                       "smtp")))
 481                      (when hostentry
 482                        (list host port
 483                              (netrc-get hostentry "login")
 484                              (netrc-get hostentry "password"))))
 485                  (smtpmail-find-credentials
 486                   smtpmail-auth-credentials host port)))
 487          (passwd (when cred
 488                    (or (smtpmail-cred-passwd cred)
 489                        (read-passwd
 490                         (format "SMTP password for %s:%s: "
 491                                 (smtpmail-cred-server cred)
 492                                 (smtpmail-cred-port cred))))))
 493          ret)
 494     (when cred
 495       (cond
 496        ((eq mech 'cram-md5)
 497         (smtpmail-send-command process (format "AUTH %s" mech))
 498         (if (or (null (car (setq ret (smtpmail-read-response process))))
 499                 (not (integerp (car ret)))
 500                 (>= (car ret) 400))
 501             (throw 'done nil))
 502         (when (eq (car ret) 334)
 503           (let* ((challenge (substring (cadr ret) 4))
 504                  (decoded (base64-decode-string challenge))
 505                  (hash (rfc2104-hash 'md5 64 16 passwd decoded))
 506                  (response (concat (smtpmail-cred-user cred) " " hash))
 507                  (encoded (base64-encode-string response)))
 508             (smtpmail-send-command process (format "%s" encoded))
 509             (if (or (null (car (setq ret (smtpmail-read-response process))))
 510                     (not (integerp (car ret)))
 511                     (>= (car ret) 400))
 512                 (throw 'done nil)))))
 513        ((eq mech 'login)
 514         (smtpmail-send-command process "AUTH LOGIN")
 515         (if (or (null (car (setq ret (smtpmail-read-response process))))
 516                 (not (integerp (car ret)))
 517                 (>= (car ret) 400))
 518             (throw 'done nil))
 519         (smtpmail-send-command
 520          process (base64-encode-string (smtpmail-cred-user cred)))
 521         (if (or (null (car (setq ret (smtpmail-read-response process))))
 522                 (not (integerp (car ret)))
 523                 (>= (car ret) 400))
 524             (throw 'done nil))
 525         (smtpmail-send-command process (base64-encode-string passwd))
 526         (if (or (null (car (setq ret (smtpmail-read-response process))))
 527                 (not (integerp (car ret)))
 528                 (>= (car ret) 400))
 529             (throw 'done nil)))
 530        (t
 531         (error "Mechanism %s not implemented" mech)))
 532       ;; Remember the password.
 533       (when (and (not (stringp smtpmail-auth-credentials))
 534                  (null (smtpmail-cred-passwd cred)))
 535         (setcar (cdr (cdr (cdr cred))) passwd)))))
 536
 537 (defun smtpmail-via-smtp (recipient smtpmail-text-buffer)
 538   (let ((process nil)
 539         (host (or smtpmail-smtp-server
 540                   (error "`smtpmail-smtp-server' not defined")))
 541         (port smtpmail-smtp-service)
 542         response-code
 543         greeting
 544         process-buffer
 545         (supported-extensions '()))
 546     (unwind-protect
 547         (catch 'done
 548           ;; get or create the trace buffer
 549           (setq process-buffer
 550                 (get-buffer-create (format "*trace of SMTP session to %s*" host)))
 551
 552           ;; clear the trace buffer of old output
 553           (with-current-buffer process-buffer
 554             (erase-buffer))
 555
 556           ;; open the connection to the server
 557           (setq process (smtpmail-open-stream process-buffer host port))
 558           (and (null process) (throw 'done nil))
 559
 560           ;; set the send-filter
 561           (set-process-filter process 'smtpmail-process-filter)
 562
 563           (with-current-buffer process-buffer
 564             (set-buffer-process-coding-system 'raw-text-unix 'raw-text-unix)
 565             (make-local-variable 'smtpmail-read-point)
 566             (setq smtpmail-read-point (point-min))
 567
 568
 569             (if (or (null (car (setq greeting (smtpmail-read-response process))))
 570                     (not (integerp (car greeting)))
 571                     (>= (car greeting) 400))
 572                 (throw 'done nil)
 573               )
 574
 575             (let ((do-ehlo t)
 576                   (do-starttls t))
 577               (while do-ehlo
 578             ;; EHLO
 579             (smtpmail-send-command process (format "EHLO %s" (smtpmail-fqdn)))
 580
 581             (if (or (null (car (setq response-code
 582                                      (smtpmail-read-response process))))
 583                     (not (integerp (car response-code)))
 584                     (>= (car response-code) 400))
 585                 (progn
 586                   ;; HELO
 587                   (smtpmail-send-command
 588                    process (format "HELO %s" (smtpmail-fqdn)))
 589
 590                   (if (or (null (car (setq response-code
 591                                            (smtpmail-read-response process))))
 592                           (not (integerp (car response-code)))
 593                           (>= (car response-code) 400))
 594                       (throw 'done nil)))
 595               (dolist (line (cdr (cdr response-code)))
 596                 (let ((name (mapcar (lambda (s) (intern (downcase s)))
 597                                     (split-string (substring line 4) "[ ]"))))
 598                   (and (eq (length name) 1)
 599                        (setq name (car name)))
 600                     (and name
 601                        (cond ((memq (if (consp name) (car name) name)
 602                                     '(verb xvrb 8bitmime onex xone
 603                                                   expn size dsn etrn
 604                                       enhancedstatuscodes
 605                                       help xusr
 606                                       auth=login auth starttls))
 607                                 (setq supported-extensions
 608                                       (cons name supported-extensions)))
 609                                (smtpmail-warn-about-unknown-extensions
 610                               (message "Unknown extension %s" name)))))))
 611
 612             (if (and do-starttls
 613                      (smtpmail-find-credentials smtpmail-starttls-credentials host port)
 614                      (member 'starttls supported-extensions)
 615                      (process-id process))
 616                 (progn
 617                   (smtpmail-send-command process (format "STARTTLS"))
 618                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 619                           (not (integerp (car response-code)))
 620                           (>= (car response-code) 400))
 621                       (throw 'done nil))
 622                   (starttls-negotiate process)
 623                   (setq do-starttls nil))
 624               (setq do-ehlo nil))))
 625
 626             (smtpmail-try-auth-methods process supported-extensions host port)
 627
 628             (if (or (member 'onex supported-extensions)
 629                     (member 'xone supported-extensions))
 630                 (progn
 631                   (smtpmail-send-command process (format "ONEX"))
 632                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 633                           (not (integerp (car response-code)))
 634                           (>= (car response-code) 400))
 635                       (throw 'done nil))))
 636
 637             (if (and smtpmail-debug-verb
 638                      (or (member 'verb supported-extensions)
 639                          (member 'xvrb supported-extensions)))
 640                 (progn
 641                   (smtpmail-send-command process (format "VERB"))
 642                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 643                           (not (integerp (car response-code)))
 644                           (>= (car response-code) 400))
 645                       (throw 'done nil))))
 646
 647             (if (member 'xusr supported-extensions)
 648                 (progn
 649                   (smtpmail-send-command process (format "XUSR"))
 650                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 651                           (not (integerp (car response-code)))
 652                           (>= (car response-code) 400))
 653                       (throw 'done nil))))
 654
 655             ;; MAIL FROM: <sender>
 656             (let ((size-part
 657                    (if (or (member 'size supported-extensions)
 658                            (assoc 'size supported-extensions))
 659                        (format " SIZE=%d"
 660                                (with-current-buffer smtpmail-text-buffer
 661                                  ;; size estimate:
 662                                  (+ (- (point-max) (point-min))
 663                                     ;; Add one byte for each change-of-line
 664                                     ;; because or CR-LF representation:
 665                                     (count-lines (point-min) (point-max))
 666                                     ;; For some reason, an empty line is
 667                                     ;; added to the message.  Maybe this
 668                                     ;; is a bug, but it can't hurt to add
 669                                     ;; those two bytes anyway:
 670                                     2)))
 671                      ""))
 672                   (body-part
 673                    (if (member '8bitmime supported-extensions)
 674                        ;; FIXME:
 675                        ;; Code should be added here that transforms
 676                        ;; the contents of the message buffer into
 677                        ;; something the receiving SMTP can handle.
 678                        ;; For a receiver that supports 8BITMIME, this
 679                        ;; may mean converting BINARY to BASE64, or
 680                        ;; adding Content-Transfer-Encoding and the
 681                        ;; other MIME headers.  The code should also
 682                        ;; return an indication of what encoding the
 683                        ;; message buffer is now, i.e. ASCII or
 684                        ;; 8BITMIME.
 685                        (if nil
 686                            " BODY=8BITMIME"
 687                          "")
 688                      "")))
 689 ;             (smtpmail-send-command process (format "MAIL FROM:%s@%s" (user-login-name) (smtpmail-fqdn)))
 690               (smtpmail-send-command process (format "MAIL FROM: <%s>%s%s"
 691                                                      (or mail-envelope-from
 692                                                          smtpmail-mail-address)
 693                                                      size-part
 694                                                      body-part))
 695
 696               (if (or (null (car (setq response-code (smtpmail-read-response process))))
 697                       (not (integerp (car response-code)))
 698                       (>= (car response-code) 400))
 699                   (throw 'done nil)
 700                 ))
 701
 702             ;; RCPT TO: <recipient>
 703             (let ((n 0))
 704               (while (not (null (nth n recipient)))
 705                 (smtpmail-send-command process (format "RCPT TO: <%s>" (smtpmail-maybe-append-domain (nth n recipient))))
 706                 (setq n (1+ n))
 707
 708                 (setq response-code (smtpmail-read-response process))
 709                 (if (or (null (car response-code))
 710                         (not (integerp (car response-code)))
 711                         (>= (car response-code) 400))
 712                     (throw 'done nil)
 713                   )
 714                 ))
 715
 716             ;; DATA
 717             (smtpmail-send-command process "DATA")
 718
 719             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 720                     (not (integerp (car response-code)))
 721                     (>= (car response-code) 400))
 722                 (throw 'done nil)
 723               )
 724
 725             ;; Mail contents
 726             (smtpmail-send-data process smtpmail-text-buffer)
 727
 728             ;;DATA end "."
 729             (smtpmail-send-command process ".")
 730
 731             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 732                     (not (integerp (car response-code)))
 733                     (>= (car response-code) 400))
 734                 (throw 'done nil)
 735               )
 736
 737             ;;QUIT
 738 ;           (smtpmail-send-command process "QUIT")
 739 ;           (and (null (car (smtpmail-read-response process)))
 740 ;                (throw 'done nil))
 741             t ))
 742       (if process
 743           (with-current-buffer (process-buffer process)
 744             (smtpmail-send-command process "QUIT")
 745             (smtpmail-read-response process)
 746
 747 ;           (if (or (null (car (setq response-code (smtpmail-read-response process))))
 748 ;                   (not (integerp (car response-code)))
 749 ;                   (>= (car response-code) 400))
 750 ;               (throw 'done nil)
 751 ;             )
 752             (delete-process process)
 753             (unless smtpmail-debug-info
 754               (kill-buffer process-buffer)))))))
 755
 756
 757 (defun smtpmail-process-filter (process output)
 758   (with-current-buffer (process-buffer process)
 759     (goto-char (point-max))
 760     (insert output)))
 761
 762 (defun smtpmail-read-response (process)
 763   (let ((case-fold-search nil)
 764         (response-strings nil)
 765         (response-continue t)
 766         (return-value '(nil ()))
 767         match-end)
 768
 769     (while response-continue
 770       (goto-char smtpmail-read-point)
 771       (while (not (search-forward "\r\n" nil t))
 772         (accept-process-output process)
 773         (goto-char smtpmail-read-point))
 774
 775       (setq match-end (point))
 776       (setq response-strings
 777             (cons (buffer-substring smtpmail-read-point (- match-end 2))
 778                   response-strings))
 779
 780       (goto-char smtpmail-read-point)
 781       (if (looking-at "[0-9]+ ")
 782           (let ((begin (match-beginning 0))
 783                 (end (match-end 0)))
 784             (if smtpmail-debug-info
 785                 (message "%s" (car response-strings)))
 786
 787             (setq smtpmail-read-point match-end)
 788
 789             ;; ignore lines that start with "0"
 790             (if (looking-at "0[0-9]+ ")
 791                 nil
 792               (setq response-continue nil)
 793               (setq return-value
 794                     (cons (string-to-int
 795                            (buffer-substring begin end))
 796                           (nreverse response-strings)))))
 797
 798         (if (looking-at "[0-9]+-")
 799             (progn (if smtpmail-debug-info
 800                      (message "%s" (car response-strings)))
 801                    (setq smtpmail-read-point match-end)
 802                    (setq response-continue t))
 803           (progn
 804             (setq smtpmail-read-point match-end)
 805             (setq response-continue nil)
 806             (setq return-value
 807                   (cons nil (nreverse response-strings)))
 808             )
 809           )))
 810     (setq smtpmail-read-point match-end)
 811     return-value))
 812
 813
 814 (defun smtpmail-send-command (process command)
 815   (goto-char (point-max))
 816   (if (= (aref command 0) ?P)
 817       (insert "PASS <omitted>\r\n")
 818     (insert command "\r\n"))
 819   (setq smtpmail-read-point (point))
 820   (process-send-string process command)
 821   (process-send-string process "\r\n"))
 822
 823 (defun smtpmail-send-data-1 (process data)
 824   (goto-char (point-max))
 825
 826   (if (and (multibyte-string-p data)
 827            smtpmail-code-conv-from)
 828       (setq data (string-as-multibyte
 829                   (encode-coding-string data smtpmail-code-conv-from))))
 830
 831   (if smtpmail-debug-info
 832       (insert data "\r\n"))
 833
 834   (setq smtpmail-read-point (point))
 835   ;; Escape "." at start of a line
 836   (if (eq (string-to-char data) ?.)
 837       (process-send-string process "."))
 838   (process-send-string process data)
 839   (process-send-string process "\r\n")
 840   )
 841
 842 (defun smtpmail-send-data (process buffer)
 843   (let
 844       ((data-continue t)
 845        (sending-data nil)
 846        this-line
 847        this-line-end)
 848
 849     (with-current-buffer buffer
 850       (goto-char (point-min)))
 851
 852     (while data-continue
 853       (with-current-buffer buffer
 854         (beginning-of-line)
 855         (setq this-line (point))
 856         (end-of-line)
 857         (setq this-line-end (point))
 858         (setq sending-data nil)
 859         (setq sending-data (buffer-substring this-line this-line-end))
 860         (if (/= (forward-line 1) 0)
 861             (setq data-continue nil)))
 862
 863       (smtpmail-send-data-1 process sending-data)
 864       )
 865     )
 866   )
 867
 868
 869 (defun smtpmail-deduce-address-list (smtpmail-text-buffer header-start header-end)
 870   "Get address list suitable for smtp RCPT TO: <address>."
 871   (unwind-protect
 872       (with-current-buffer smtpmail-address-buffer
 873         (erase-buffer)
 874         (let
 875             ((case-fold-search t)
 876              (simple-address-list "")
 877              this-line
 878              this-line-end
 879              addr-regexp)
 880           (insert-buffer-substring smtpmail-text-buffer header-start header-end)
 881           (goto-char (point-min))
 882           ;; RESENT-* fields should stop processing of regular fields.
 883           (save-excursion
 884             (setq addr-regexp
 885                   (if (re-search-forward "^Resent-\\(to\\|cc\\|bcc\\):"
 886                                          header-end t)
 887                       "^Resent-\\(to\\|cc\\|bcc\\):"
 888                     "^\\(To:\\|Cc:\\|Bcc:\\)")))
 889
 890           (while (re-search-forward addr-regexp header-end t)
 891             (replace-match "")
 892             (setq this-line (match-beginning 0))
 893             (forward-line 1)
 894             ;; get any continuation lines
 895             (while (and (looking-at "^[ \t]+") (< (point) header-end))
 896               (forward-line 1))
 897             (setq this-line-end (point-marker))
 898             (setq simple-address-list
 899                   (concat simple-address-list " "
 900                           (mail-strip-quoted-names (buffer-substring this-line this-line-end))))
 901             )
 902           (erase-buffer)
 903           (insert " " simple-address-list "\n")
 904           (subst-char-in-region (point-min) (point-max) 10 ?  t);; newline --> blank
 905           (subst-char-in-region (point-min) (point-max) ?, ?  t);; comma   --> blank
 906           (subst-char-in-region (point-min) (point-max)  9 ?  t);; tab     --> blank
 907
 908           (goto-char (point-min))
 909           ;; tidyness in case hook is not robust when it looks at this
 910           (while (re-search-forward "[ \t]+" header-end t) (replace-match " "))
 911
 912           (goto-char (point-min))
 913           (let (recipient-address-list)
 914             (while (re-search-forward " \\([^ ]+\\) " (point-max) t)
 915               (backward-char 1)
 916               (setq recipient-address-list (cons (buffer-substring (match-beginning 1) (match-end 1))
 917                                                  recipient-address-list))
 918               )
 919             (setq smtpmail-recipient-address-list recipient-address-list))
 920
 921           )
 922         )
 923     )
 924   )
 925
 926
 927 (defun smtpmail-do-bcc (header-end)
 928   "Delete [Resent-]BCC: and their continuation lines from the header area.
 929 There may be multiple BCC: lines, and each may have arbitrarily
 930 many continuation lines."
 931   (let ((case-fold-search t))
 932     (save-excursion
 933       (goto-char (point-min))
 934       ;; iterate over all BCC: lines
 935       (while (re-search-forward "^\\(RESENT-\\)?BCC:" header-end t)
 936         (delete-region (match-beginning 0)
 937                        (progn (forward-line 1) (point)))
 938         ;; get rid of any continuation lines
 939         (while (and (looking-at "^[ \t].*\n") (< (point) header-end))
 940           (replace-match ""))))))
 941
 942
 943 (provide 'smtpmail)
 944
 945 ;;; smtpmail.el ends here