lisp/mail/smtpmail.el

   1 ;;; smtpmail.el --- simple SMTP protocol (RFC 821) for sending mail
   2
   3 ;; Copyright (C) 1995, 1996, 2001, 2002 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 (autoload 'starttls-open-stream "starttls")
  70 (autoload 'starttls-negotiate "starttls")
  71 (autoload 'mail-strip-quoted-names "mail-utils")
  72 (autoload 'message-make-date "message")
  73 (autoload 'message-make-message-id "message")
  74 (autoload 'rfc2104-hash "rfc2104")
  75 (autoload 'netrc-parse "netrc")
  76 (autoload 'netrc-machine "netrc")
  77 (autoload 'netrc-get "netrc")
  78
  79 ;;;
  80 (defgroup smtpmail nil
  81   "SMTP protocol for sending mail."
  82   :group 'mail)
  83
  84
  85 (defcustom smtpmail-default-smtp-server nil
  86   "*Specify default SMTP server.
  87 This only has effect if you specify it before loading the smtpmail library."
  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
 346                     (expand-file-name
 347                      (format "%s_%i"
 348                              (format-time-string "%Y-%m-%d_%H:%M:%S")
 349                              (setq smtpmail-queue-counter
 350                                    (1+ smtpmail-queue-counter)))
 351                      smtpmail-queue-dir))
 352                    (file-data (convert-standard-filename file-data))
 353                    (file-elisp (concat file-data ".el"))
 354                    (buffer-data (create-file-buffer file-data))
 355                    (buffer-elisp (create-file-buffer file-elisp))
 356                    (buffer-scratch "*queue-mail*"))
 357               (with-current-buffer buffer-data
 358                 (erase-buffer)
 359                 (insert-buffer tembuf)
 360                 (write-file file-data)
 361                 (set-buffer buffer-elisp)
 362                 (erase-buffer)
 363                 (insert (concat
 364                          "(setq smtpmail-recipient-address-list '"
 365                          (prin1-to-string smtpmail-recipient-address-list)
 366                          ")\n"))
 367                 (write-file file-elisp)
 368                 (set-buffer (generate-new-buffer buffer-scratch))
 369                 (insert (concat file-data "\n"))
 370                 (append-to-file (point-min)
 371                                 (point-max)
 372                                 smtpmail-queue-index)
 373                 )
 374               (kill-buffer buffer-scratch)
 375               (kill-buffer buffer-data)
 376               (kill-buffer buffer-elisp))))
 377       (kill-buffer tembuf)
 378       (if (bufferp errbuf)
 379           (kill-buffer errbuf)))))
 380
 381 (defun smtpmail-send-queued-mail ()
 382   "Send mail that was queued as a result of setting `smtpmail-queue-mail'."
 383   (interactive)
 384   (with-temp-buffer
 385     ;;; Get index, get first mail, send it, update index, get second
 386     ;;; mail, send it, etc...
 387     (let ((file-msg ""))
 388       (insert-file-contents smtpmail-queue-index)
 389       (beginning-of-buffer)
 390       (while (not (eobp))
 391         (setq file-msg (buffer-substring (point) (line-end-position)))
 392         (load file-msg)
 393         ;; Insert the message literally: it is already encoded as per
 394         ;; the MIME headers, and code conversions might guess the
 395         ;; encoding wrongly.
 396         (with-temp-buffer
 397           (let ((coding-system-for-read 'no-conversion))
 398             (insert-file-contents file-msg))
 399           (if (not (null smtpmail-recipient-address-list))
 400               (if (not (smtpmail-via-smtp smtpmail-recipient-address-list
 401                                           (current-buffer)))
 402                   (error "Sending failed; SMTP protocol error"))
 403             (error "Sending failed; no recipients")))
 404         (delete-file file-msg)
 405         (delete-file (concat file-msg ".el"))
 406         (kill-line 1))
 407       (write-region (point-min) (point-max) smtpmail-queue-index))))
 408
 409 ;(defun smtpmail-via-smtp (host,port,sender,destination,smtpmail-text-buffer)
 410
 411 (defun smtpmail-fqdn ()
 412   (if smtpmail-local-domain
 413       (concat (system-name) "." smtpmail-local-domain)
 414     (system-name)))
 415
 416 (defsubst smtpmail-cred-server (cred)
 417   (nth 0 cred))
 418
 419 (defsubst smtpmail-cred-port (cred)
 420   (nth 1 cred))
 421
 422 (defsubst smtpmail-cred-key (cred)
 423   (nth 2 cred))
 424
 425 (defsubst smtpmail-cred-user (cred)
 426   (nth 2 cred))
 427
 428 (defsubst smtpmail-cred-cert (cred)
 429   (nth 3 cred))
 430
 431 (defsubst smtpmail-cred-passwd (cred)
 432   (nth 3 cred))
 433
 434 (defun smtpmail-find-credentials (cred server port)
 435   (catch 'done
 436     (let ((l cred) el)
 437       (while (setq el (pop l))
 438         (when (and (equal server (smtpmail-cred-server el))
 439                    (equal port (smtpmail-cred-port el)))
 440           (throw 'done el))))))
 441
 442 (defun smtpmail-maybe-append-domain (recipient)
 443   (if (or (not smtpmail-sendto-domain)
 444           (string-match "@" recipient))
 445       recipient
 446     (concat recipient "@" smtpmail-sendto-domain)))
 447
 448 (defun smtpmail-intersection (list1 list2)
 449   (let ((result nil))
 450     (dolist (el2 list2)
 451       (when (memq el2 list1)
 452         (push el2 result)))
 453     (nreverse result)))
 454
 455 (defun smtpmail-open-stream (process-buffer host port)
 456   (let ((cred (smtpmail-find-credentials
 457                smtpmail-starttls-credentials host port)))
 458     (if (null (and cred (condition-case ()
 459                             (call-process "starttls")
 460                           (error nil))))
 461         ;; The normal case.
 462         (open-network-stream "SMTP" process-buffer host port)
 463       (let* ((cred-key (smtpmail-cred-key cred))
 464              (cred-cert (smtpmail-cred-cert cred))
 465              (starttls-extra-args
 466               (when (and (stringp cred-key) (stringp cred-cert)
 467                          (file-regular-p
 468                           (setq cred-key (expand-file-name cred-key)))
 469                          (file-regular-p
 470                           (setq cred-cert (expand-file-name cred-cert))))
 471                 (list "--key-file" cred-key "--cert-file" cred-cert))))
 472         (starttls-open-stream "SMTP" process-buffer host port)))))
 473
 474 (defun smtpmail-try-auth-methods (process supported-extensions host port)
 475   (let* ((mechs (cdr-safe (assoc 'auth supported-extensions)))
 476          (mech (car (smtpmail-intersection smtpmail-auth-supported mechs)))
 477          (cred (if (stringp smtpmail-auth-credentials)
 478                    (let* ((netrc (netrc-parse smtpmail-auth-credentials))
 479                           (hostentry (netrc-machine
 480                                       netrc host (format "%s" (or port "smtp"))
 481                                       "smtp")))
 482                      (when hostentry
 483                        (list host port
 484                              (netrc-get hostentry "login")
 485                              (netrc-get hostentry "password"))))
 486                  (smtpmail-find-credentials
 487                   smtpmail-auth-credentials host port)))
 488          (passwd (when cred
 489                    (or (smtpmail-cred-passwd cred)
 490                        (read-passwd
 491                         (format "SMTP password for %s:%s: "
 492                                 (smtpmail-cred-server cred)
 493                                 (smtpmail-cred-port cred))))))
 494          ret)
 495     (when cred
 496       (cond
 497        ((eq mech 'cram-md5)
 498         (smtpmail-send-command process (format "AUTH %s" mech))
 499         (if (or (null (car (setq ret (smtpmail-read-response process))))
 500                 (not (integerp (car ret)))
 501                 (>= (car ret) 400))
 502             (throw 'done nil))
 503         (when (eq (car ret) 334)
 504           (let* ((challenge (substring (cadr ret) 4))
 505                  (decoded (base64-decode-string challenge))
 506                  (hash (rfc2104-hash 'md5 64 16 passwd decoded))
 507                  (response (concat (smtpmail-cred-user cred) " " hash))
 508                  (encoded (base64-encode-string response)))
 509             (smtpmail-send-command process (format "%s" encoded))
 510             (if (or (null (car (setq ret (smtpmail-read-response process))))
 511                     (not (integerp (car ret)))
 512                     (>= (car ret) 400))
 513                 (throw 'done nil)))))
 514        ((eq mech 'login)
 515         (smtpmail-send-command process "AUTH LOGIN")
 516         (if (or (null (car (setq ret (smtpmail-read-response process))))
 517                 (not (integerp (car ret)))
 518                 (>= (car ret) 400))
 519             (throw 'done nil))
 520         (smtpmail-send-command
 521          process (base64-encode-string (smtpmail-cred-user cred)))
 522         (if (or (null (car (setq ret (smtpmail-read-response process))))
 523                 (not (integerp (car ret)))
 524                 (>= (car ret) 400))
 525             (throw 'done nil))
 526         (smtpmail-send-command process (base64-encode-string passwd))
 527         (if (or (null (car (setq ret (smtpmail-read-response process))))
 528                 (not (integerp (car ret)))
 529                 (>= (car ret) 400))
 530             (throw 'done nil)))
 531        (t
 532         (error "Mechanism %s not implemented" mech)))
 533       ;; Remember the password.
 534       (when (and (not (stringp smtpmail-auth-credentials))
 535                  (null (smtpmail-cred-passwd cred)))
 536         (setcar (cdr (cdr (cdr cred))) passwd)))))
 537
 538 (defun smtpmail-via-smtp (recipient smtpmail-text-buffer)
 539   (let ((process nil)
 540         (host (or smtpmail-smtp-server
 541                   (error "`smtpmail-smtp-server' not defined")))
 542         (port smtpmail-smtp-service)
 543         response-code
 544         greeting
 545         process-buffer
 546         (supported-extensions '()))
 547     (unwind-protect
 548         (catch 'done
 549           ;; get or create the trace buffer
 550           (setq process-buffer
 551                 (get-buffer-create (format "*trace of SMTP session to %s*" host)))
 552
 553           ;; clear the trace buffer of old output
 554           (with-current-buffer process-buffer
 555             (erase-buffer))
 556
 557           ;; open the connection to the server
 558           (setq process (smtpmail-open-stream process-buffer host port))
 559           (and (null process) (throw 'done nil))
 560
 561           ;; set the send-filter
 562           (set-process-filter process 'smtpmail-process-filter)
 563
 564           (with-current-buffer process-buffer
 565             (set-buffer-process-coding-system 'raw-text-unix 'raw-text-unix)
 566             (make-local-variable 'smtpmail-read-point)
 567             (setq smtpmail-read-point (point-min))
 568
 569
 570             (if (or (null (car (setq greeting (smtpmail-read-response process))))
 571                     (not (integerp (car greeting)))
 572                     (>= (car greeting) 400))
 573                 (throw 'done nil)
 574               )
 575
 576             (let ((do-ehlo t)
 577                   (do-starttls t))
 578               (while do-ehlo
 579             ;; EHLO
 580             (smtpmail-send-command process (format "EHLO %s" (smtpmail-fqdn)))
 581
 582             (if (or (null (car (setq response-code
 583                                      (smtpmail-read-response process))))
 584                     (not (integerp (car response-code)))
 585                     (>= (car response-code) 400))
 586                 (progn
 587                   ;; HELO
 588                   (smtpmail-send-command
 589                    process (format "HELO %s" (smtpmail-fqdn)))
 590
 591                   (if (or (null (car (setq response-code
 592                                            (smtpmail-read-response process))))
 593                           (not (integerp (car response-code)))
 594                           (>= (car response-code) 400))
 595                       (throw 'done nil)))
 596               (dolist (line (cdr (cdr response-code)))
 597                 (let ((name (mapcar (lambda (s) (intern (downcase s)))
 598                                     (split-string (substring line 4) "[ ]"))))
 599                   (and (eq (length name) 1)
 600                        (setq name (car name)))
 601                     (and name
 602                        (cond ((memq (if (consp name) (car name) name)
 603                                     '(verb xvrb 8bitmime onex xone
 604                                                   expn size dsn etrn
 605                                       enhancedstatuscodes
 606                                       help xusr
 607                                       auth=login auth starttls))
 608                                 (setq supported-extensions
 609                                       (cons name supported-extensions)))
 610                                (smtpmail-warn-about-unknown-extensions
 611                               (message "Unknown extension %s" name)))))))
 612
 613             (if (and do-starttls
 614                      (smtpmail-find-credentials smtpmail-starttls-credentials host port)
 615                      (member 'starttls supported-extensions)
 616                      (process-id process))
 617                 (progn
 618                   (smtpmail-send-command process (format "STARTTLS"))
 619                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 620                           (not (integerp (car response-code)))
 621                           (>= (car response-code) 400))
 622                       (throw 'done nil))
 623                   (starttls-negotiate process)
 624                   (setq do-starttls nil))
 625               (setq do-ehlo nil))))
 626
 627             (smtpmail-try-auth-methods process supported-extensions host port)
 628
 629             (if (or (member 'onex supported-extensions)
 630                     (member 'xone supported-extensions))
 631                 (progn
 632                   (smtpmail-send-command process (format "ONEX"))
 633                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 634                           (not (integerp (car response-code)))
 635                           (>= (car response-code) 400))
 636                       (throw 'done nil))))
 637
 638             (if (and smtpmail-debug-verb
 639                      (or (member 'verb supported-extensions)
 640                          (member 'xvrb supported-extensions)))
 641                 (progn
 642                   (smtpmail-send-command process (format "VERB"))
 643                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 644                           (not (integerp (car response-code)))
 645                           (>= (car response-code) 400))
 646                       (throw 'done nil))))
 647
 648             (if (member 'xusr supported-extensions)
 649                 (progn
 650                   (smtpmail-send-command process (format "XUSR"))
 651                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 652                           (not (integerp (car response-code)))
 653                           (>= (car response-code) 400))
 654                       (throw 'done nil))))
 655
 656             ;; MAIL FROM: <sender>
 657             (let ((size-part
 658                    (if (or (member 'size supported-extensions)
 659                            (assoc 'size supported-extensions))
 660                        (format " SIZE=%d"
 661                                (with-current-buffer smtpmail-text-buffer
 662                                  ;; size estimate:
 663                                  (+ (- (point-max) (point-min))
 664                                     ;; Add one byte for each change-of-line
 665                                     ;; because or CR-LF representation:
 666                                     (count-lines (point-min) (point-max))
 667                                     ;; For some reason, an empty line is
 668                                     ;; added to the message.  Maybe this
 669                                     ;; is a bug, but it can't hurt to add
 670                                     ;; those two bytes anyway:
 671                                     2)))
 672                      ""))
 673                   (body-part
 674                    (if (member '8bitmime supported-extensions)
 675                        ;; FIXME:
 676                        ;; Code should be added here that transforms
 677                        ;; the contents of the message buffer into
 678                        ;; something the receiving SMTP can handle.
 679                        ;; For a receiver that supports 8BITMIME, this
 680                        ;; may mean converting BINARY to BASE64, or
 681                        ;; adding Content-Transfer-Encoding and the
 682                        ;; other MIME headers.  The code should also
 683                        ;; return an indication of what encoding the
 684                        ;; message buffer is now, i.e. ASCII or
 685                        ;; 8BITMIME.
 686                        (if nil
 687                            " BODY=8BITMIME"
 688                          "")
 689                      "")))
 690 ;             (smtpmail-send-command process (format "MAIL FROM:%s@%s" (user-login-name) (smtpmail-fqdn)))
 691               (smtpmail-send-command process (format "MAIL FROM: <%s>%s%s"
 692                                                      (or mail-envelope-from
 693                                                          smtpmail-mail-address)
 694                                                      size-part
 695                                                      body-part))
 696
 697               (if (or (null (car (setq response-code (smtpmail-read-response process))))
 698                       (not (integerp (car response-code)))
 699                       (>= (car response-code) 400))
 700                   (throw 'done nil)
 701                 ))
 702
 703             ;; RCPT TO: <recipient>
 704             (let ((n 0))
 705               (while (not (null (nth n recipient)))
 706                 (smtpmail-send-command process (format "RCPT TO: <%s>" (smtpmail-maybe-append-domain (nth n recipient))))
 707                 (setq n (1+ n))
 708
 709                 (setq response-code (smtpmail-read-response process))
 710                 (if (or (null (car response-code))
 711                         (not (integerp (car response-code)))
 712                         (>= (car response-code) 400))
 713                     (throw 'done nil)
 714                   )
 715                 ))
 716
 717             ;; DATA
 718             (smtpmail-send-command process "DATA")
 719
 720             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 721                     (not (integerp (car response-code)))
 722                     (>= (car response-code) 400))
 723                 (throw 'done nil)
 724               )
 725
 726             ;; Mail contents
 727             (smtpmail-send-data process smtpmail-text-buffer)
 728
 729             ;;DATA end "."
 730             (smtpmail-send-command process ".")
 731
 732             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 733                     (not (integerp (car response-code)))
 734                     (>= (car response-code) 400))
 735                 (throw 'done nil)
 736               )
 737
 738             ;;QUIT
 739 ;           (smtpmail-send-command process "QUIT")
 740 ;           (and (null (car (smtpmail-read-response process)))
 741 ;                (throw 'done nil))
 742             t ))
 743       (if process
 744           (with-current-buffer (process-buffer process)
 745             (smtpmail-send-command process "QUIT")
 746             (smtpmail-read-response process)
 747
 748 ;           (if (or (null (car (setq response-code (smtpmail-read-response process))))
 749 ;                   (not (integerp (car response-code)))
 750 ;                   (>= (car response-code) 400))
 751 ;               (throw 'done nil)
 752 ;             )
 753             (delete-process process)
 754             (unless smtpmail-debug-info
 755               (kill-buffer process-buffer)))))))
 756
 757
 758 (defun smtpmail-process-filter (process output)
 759   (with-current-buffer (process-buffer process)
 760     (goto-char (point-max))
 761     (insert output)))
 762
 763 (defun smtpmail-read-response (process)
 764   (let ((case-fold-search nil)
 765         (response-strings nil)
 766         (response-continue t)
 767         (return-value '(nil ()))
 768         match-end)
 769
 770     (while response-continue
 771       (goto-char smtpmail-read-point)
 772       (while (not (search-forward "\r\n" nil t))
 773         (accept-process-output process)
 774         (goto-char smtpmail-read-point))
 775
 776       (setq match-end (point))
 777       (setq response-strings
 778             (cons (buffer-substring smtpmail-read-point (- match-end 2))
 779                   response-strings))
 780
 781       (goto-char smtpmail-read-point)
 782       (if (looking-at "[0-9]+ ")
 783           (let ((begin (match-beginning 0))
 784                 (end (match-end 0)))
 785             (if smtpmail-debug-info
 786                 (message "%s" (car response-strings)))
 787
 788             (setq smtpmail-read-point match-end)
 789
 790             ;; ignore lines that start with "0"
 791             (if (looking-at "0[0-9]+ ")
 792                 nil
 793               (setq response-continue nil)
 794               (setq return-value
 795                     (cons (string-to-int
 796                            (buffer-substring begin end))
 797                           (nreverse response-strings)))))
 798
 799         (if (looking-at "[0-9]+-")
 800             (progn (if smtpmail-debug-info
 801                      (message "%s" (car response-strings)))
 802                    (setq smtpmail-read-point match-end)
 803                    (setq response-continue t))
 804           (progn
 805             (setq smtpmail-read-point match-end)
 806             (setq response-continue nil)
 807             (setq return-value
 808                   (cons nil (nreverse response-strings)))
 809             )
 810           )))
 811     (setq smtpmail-read-point match-end)
 812     return-value))
 813
 814
 815 (defun smtpmail-send-command (process command)
 816   (goto-char (point-max))
 817   (if (= (aref command 0) ?P)
 818       (insert "PASS <omitted>\r\n")
 819     (insert command "\r\n"))
 820   (setq smtpmail-read-point (point))
 821   (process-send-string process command)
 822   (process-send-string process "\r\n"))
 823
 824 (defun smtpmail-send-data-1 (process data)
 825   (goto-char (point-max))
 826
 827   (if (and (multibyte-string-p data)
 828            smtpmail-code-conv-from)
 829       (setq data (string-as-multibyte
 830                   (encode-coding-string data smtpmail-code-conv-from))))
 831
 832   (if smtpmail-debug-info
 833       (insert data "\r\n"))
 834
 835   (setq smtpmail-read-point (point))
 836   ;; Escape "." at start of a line
 837   (if (eq (string-to-char data) ?.)
 838       (process-send-string process "."))
 839   (process-send-string process data)
 840   (process-send-string process "\r\n")
 841   )
 842
 843 (defun smtpmail-send-data (process buffer)
 844   (let
 845       ((data-continue t)
 846        (sending-data nil)
 847        this-line
 848        this-line-end)
 849
 850     (with-current-buffer buffer
 851       (goto-char (point-min)))
 852
 853     (while data-continue
 854       (with-current-buffer buffer
 855         (beginning-of-line)
 856         (setq this-line (point))
 857         (end-of-line)
 858         (setq this-line-end (point))
 859         (setq sending-data nil)
 860         (setq sending-data (buffer-substring this-line this-line-end))
 861         (if (/= (forward-line 1) 0)
 862             (setq data-continue nil)))
 863
 864       (smtpmail-send-data-1 process sending-data)
 865       )
 866     )
 867   )
 868
 869
 870 (defun smtpmail-deduce-address-list (smtpmail-text-buffer header-start header-end)
 871   "Get address list suitable for smtp RCPT TO: <address>."
 872   (unwind-protect
 873       (with-current-buffer smtpmail-address-buffer
 874         (erase-buffer)
 875         (let
 876             ((case-fold-search t)
 877              (simple-address-list "")
 878              this-line
 879              this-line-end
 880              addr-regexp)
 881           (insert-buffer-substring smtpmail-text-buffer header-start header-end)
 882           (goto-char (point-min))
 883           ;; RESENT-* fields should stop processing of regular fields.
 884           (save-excursion
 885             (setq addr-regexp
 886                   (if (re-search-forward "^Resent-\\(to\\|cc\\|bcc\\):"
 887                                          header-end t)
 888                       "^Resent-\\(to\\|cc\\|bcc\\):"
 889                     "^\\(To:\\|Cc:\\|Bcc:\\)")))
 890
 891           (while (re-search-forward addr-regexp header-end t)
 892             (replace-match "")
 893             (setq this-line (match-beginning 0))
 894             (forward-line 1)
 895             ;; get any continuation lines
 896             (while (and (looking-at "^[ \t]+") (< (point) header-end))
 897               (forward-line 1))
 898             (setq this-line-end (point-marker))
 899             (setq simple-address-list
 900                   (concat simple-address-list " "
 901                           (mail-strip-quoted-names (buffer-substring this-line this-line-end))))
 902             )
 903           (erase-buffer)
 904           (insert " " simple-address-list "\n")
 905           (subst-char-in-region (point-min) (point-max) 10 ?  t);; newline --> blank
 906           (subst-char-in-region (point-min) (point-max) ?, ?  t);; comma   --> blank
 907           (subst-char-in-region (point-min) (point-max)  9 ?  t);; tab     --> blank
 908
 909           (goto-char (point-min))
 910           ;; tidyness in case hook is not robust when it looks at this
 911           (while (re-search-forward "[ \t]+" header-end t) (replace-match " "))
 912
 913           (goto-char (point-min))
 914           (let (recipient-address-list)
 915             (while (re-search-forward " \\([^ ]+\\) " (point-max) t)
 916               (backward-char 1)
 917               (setq recipient-address-list (cons (buffer-substring (match-beginning 1) (match-end 1))
 918                                                  recipient-address-list))
 919               )
 920             (setq smtpmail-recipient-address-list recipient-address-list))
 921
 922           )
 923         )
 924     )
 925   )
 926
 927
 928 (defun smtpmail-do-bcc (header-end)
 929   "Delete [Resent-]BCC: and their continuation lines from the header area.
 930 There may be multiple BCC: lines, and each may have arbitrarily
 931 many continuation lines."
 932   (let ((case-fold-search t))
 933     (save-excursion
 934       (goto-char (point-min))
 935       ;; iterate over all BCC: lines
 936       (while (re-search-forward "^\\(RESENT-\\)?BCC:" header-end t)
 937         (delete-region (match-beginning 0)
 938                        (progn (forward-line 1) (point)))
 939         ;; get rid of any continuation lines
 940         (while (and (looking-at "^[ \t].*\n") (< (point) header-end))
 941           (replace-match ""))))))
 942
 943
 944 (provide 'smtpmail)
 945
 946 ;;; smtpmail.el ends here