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 ;;;###autoload
 382 (defun smtpmail-send-queued-mail ()
 383   "Send mail that was queued as a result of setting `smtpmail-queue-mail'."
 384   (interactive)
 385   (with-temp-buffer
 386     ;;; Get index, get first mail, send it, update index, get second
 387     ;;; mail, send it, etc...
 388     (let ((file-msg ""))
 389       (insert-file-contents smtpmail-queue-index)
 390       (beginning-of-buffer)
 391       (while (not (eobp))
 392         (setq file-msg (buffer-substring (point) (line-end-position)))
 393         (load file-msg)
 394         ;; Insert the message literally: it is already encoded as per
 395         ;; the MIME headers, and code conversions might guess the
 396         ;; encoding wrongly.
 397         (with-temp-buffer
 398           (let ((coding-system-for-read 'no-conversion))
 399             (insert-file-contents file-msg))
 400           (if (not (null smtpmail-recipient-address-list))
 401               (if (not (smtpmail-via-smtp smtpmail-recipient-address-list
 402                                           (current-buffer)))
 403                   (error "Sending failed; SMTP protocol error"))
 404             (error "Sending failed; no recipients")))
 405         (delete-file file-msg)
 406         (delete-file (concat file-msg ".el"))
 407         (kill-line 1))
 408       (write-region (point-min) (point-max) smtpmail-queue-index))))
 409
 410 ;(defun smtpmail-via-smtp (host,port,sender,destination,smtpmail-text-buffer)
 411
 412 (defun smtpmail-fqdn ()
 413   (if smtpmail-local-domain
 414       (concat (system-name) "." smtpmail-local-domain)
 415     (system-name)))
 416
 417 (defsubst smtpmail-cred-server (cred)
 418   (nth 0 cred))
 419
 420 (defsubst smtpmail-cred-port (cred)
 421   (nth 1 cred))
 422
 423 (defsubst smtpmail-cred-key (cred)
 424   (nth 2 cred))
 425
 426 (defsubst smtpmail-cred-user (cred)
 427   (nth 2 cred))
 428
 429 (defsubst smtpmail-cred-cert (cred)
 430   (nth 3 cred))
 431
 432 (defsubst smtpmail-cred-passwd (cred)
 433   (nth 3 cred))
 434
 435 (defun smtpmail-find-credentials (cred server port)
 436   (catch 'done
 437     (let ((l cred) el)
 438       (while (setq el (pop l))
 439         (when (and (equal server (smtpmail-cred-server el))
 440                    (equal port (smtpmail-cred-port el)))
 441           (throw 'done el))))))
 442
 443 (defun smtpmail-maybe-append-domain (recipient)
 444   (if (or (not smtpmail-sendto-domain)
 445           (string-match "@" recipient))
 446       recipient
 447     (concat recipient "@" smtpmail-sendto-domain)))
 448
 449 (defun smtpmail-intersection (list1 list2)
 450   (let ((result nil))
 451     (dolist (el2 list2)
 452       (when (memq el2 list1)
 453         (push el2 result)))
 454     (nreverse result)))
 455
 456 (defun smtpmail-open-stream (process-buffer host port)
 457   (let ((cred (smtpmail-find-credentials
 458                smtpmail-starttls-credentials host port)))
 459     (if (null (and cred (condition-case ()
 460                             (call-process "starttls")
 461                           (error nil))))
 462         ;; The normal case.
 463         (open-network-stream "SMTP" process-buffer host port)
 464       (let* ((cred-key (smtpmail-cred-key cred))
 465              (cred-cert (smtpmail-cred-cert cred))
 466              (starttls-extra-args
 467               (when (and (stringp cred-key) (stringp cred-cert)
 468                          (file-regular-p
 469                           (setq cred-key (expand-file-name cred-key)))
 470                          (file-regular-p
 471                           (setq cred-cert (expand-file-name cred-cert))))
 472                 (list "--key-file" cred-key "--cert-file" cred-cert))))
 473         (starttls-open-stream "SMTP" process-buffer host port)))))
 474
 475 (defun smtpmail-try-auth-methods (process supported-extensions host port)
 476   (let* ((mechs (cdr-safe (assoc 'auth supported-extensions)))
 477          (mech (car (smtpmail-intersection smtpmail-auth-supported mechs)))
 478          (cred (if (stringp smtpmail-auth-credentials)
 479                    (let* ((netrc (netrc-parse smtpmail-auth-credentials))
 480                           (hostentry (netrc-machine
 481                                       netrc host (format "%s" (or port "smtp"))
 482                                       "smtp")))
 483                      (when hostentry
 484                        (list host port
 485                              (netrc-get hostentry "login")
 486                              (netrc-get hostentry "password"))))
 487                  (smtpmail-find-credentials
 488                   smtpmail-auth-credentials host port)))
 489          (passwd (when cred
 490                    (or (smtpmail-cred-passwd cred)
 491                        (read-passwd
 492                         (format "SMTP password for %s:%s: "
 493                                 (smtpmail-cred-server cred)
 494                                 (smtpmail-cred-port cred))))))
 495          ret)
 496     (when cred
 497       (cond
 498        ((eq mech 'cram-md5)
 499         (smtpmail-send-command process (format "AUTH %s" mech))
 500         (if (or (null (car (setq ret (smtpmail-read-response process))))
 501                 (not (integerp (car ret)))
 502                 (>= (car ret) 400))
 503             (throw 'done nil))
 504         (when (eq (car ret) 334)
 505           (let* ((challenge (substring (cadr ret) 4))
 506                  (decoded (base64-decode-string challenge))
 507                  (hash (rfc2104-hash 'md5 64 16 passwd decoded))
 508                  (response (concat (smtpmail-cred-user cred) " " hash))
 509                  (encoded (base64-encode-string response)))
 510             (smtpmail-send-command process (format "%s" encoded))
 511             (if (or (null (car (setq ret (smtpmail-read-response process))))
 512                     (not (integerp (car ret)))
 513                     (>= (car ret) 400))
 514                 (throw 'done nil)))))
 515        ((eq mech 'login)
 516         (smtpmail-send-command process "AUTH LOGIN")
 517         (if (or (null (car (setq ret (smtpmail-read-response process))))
 518                 (not (integerp (car ret)))
 519                 (>= (car ret) 400))
 520             (throw 'done nil))
 521         (smtpmail-send-command
 522          process (base64-encode-string (smtpmail-cred-user cred)))
 523         (if (or (null (car (setq ret (smtpmail-read-response process))))
 524                 (not (integerp (car ret)))
 525                 (>= (car ret) 400))
 526             (throw 'done nil))
 527         (smtpmail-send-command process (base64-encode-string passwd))
 528         (if (or (null (car (setq ret (smtpmail-read-response process))))
 529                 (not (integerp (car ret)))
 530                 (>= (car ret) 400))
 531             (throw 'done nil)))
 532        (t
 533         (error "Mechanism %s not implemented" mech)))
 534       ;; Remember the password.
 535       (when (and (not (stringp smtpmail-auth-credentials))
 536                  (null (smtpmail-cred-passwd cred)))
 537         (setcar (cdr (cdr (cdr cred))) passwd)))))
 538
 539 (defun smtpmail-via-smtp (recipient smtpmail-text-buffer)
 540   (let ((process nil)
 541         (host (or smtpmail-smtp-server
 542                   (error "`smtpmail-smtp-server' not defined")))
 543         (port smtpmail-smtp-service)
 544         (envelope-from (or (mail-envelope-from)
 545                            smtpmail-mail-address
 546                            user-mail-address))
 547         response-code
 548         greeting
 549         process-buffer
 550         (supported-extensions '()))
 551     (unwind-protect
 552         (catch 'done
 553           ;; get or create the trace buffer
 554           (setq process-buffer
 555                 (get-buffer-create (format "*trace of SMTP session to %s*" host)))
 556
 557           ;; clear the trace buffer of old output
 558           (with-current-buffer process-buffer
 559             (erase-buffer))
 560
 561           ;; open the connection to the server
 562           (setq process (smtpmail-open-stream process-buffer host port))
 563           (and (null process) (throw 'done nil))
 564
 565           ;; set the send-filter
 566           (set-process-filter process 'smtpmail-process-filter)
 567
 568           (with-current-buffer process-buffer
 569             (set-buffer-process-coding-system 'raw-text-unix 'raw-text-unix)
 570             (make-local-variable 'smtpmail-read-point)
 571             (setq smtpmail-read-point (point-min))
 572
 573
 574             (if (or (null (car (setq greeting (smtpmail-read-response process))))
 575                     (not (integerp (car greeting)))
 576                     (>= (car greeting) 400))
 577                 (throw 'done nil)
 578               )
 579
 580             (let ((do-ehlo t)
 581                   (do-starttls t))
 582               (while do-ehlo
 583             ;; EHLO
 584             (smtpmail-send-command process (format "EHLO %s" (smtpmail-fqdn)))
 585
 586             (if (or (null (car (setq response-code
 587                                      (smtpmail-read-response process))))
 588                     (not (integerp (car response-code)))
 589                     (>= (car response-code) 400))
 590                 (progn
 591                   ;; HELO
 592                   (smtpmail-send-command
 593                    process (format "HELO %s" (smtpmail-fqdn)))
 594
 595                   (if (or (null (car (setq response-code
 596                                            (smtpmail-read-response process))))
 597                           (not (integerp (car response-code)))
 598                           (>= (car response-code) 400))
 599                       (throw 'done nil)))
 600               (dolist (line (cdr (cdr response-code)))
 601                 (let ((name (mapcar (lambda (s) (intern (downcase s)))
 602                                     (split-string (substring line 4) "[ ]"))))
 603                   (and (eq (length name) 1)
 604                        (setq name (car name)))
 605                     (and name
 606                        (cond ((memq (if (consp name) (car name) name)
 607                                     '(verb xvrb 8bitmime onex xone
 608                                                   expn size dsn etrn
 609                                       enhancedstatuscodes
 610                                       help xusr
 611                                       auth=login auth starttls))
 612                                 (setq supported-extensions
 613                                       (cons name supported-extensions)))
 614                                (smtpmail-warn-about-unknown-extensions
 615                               (message "Unknown extension %s" name)))))))
 616
 617             (if (and do-starttls
 618                      (smtpmail-find-credentials smtpmail-starttls-credentials host port)
 619                      (member 'starttls supported-extensions)
 620                      (numberp (process-id process)))
 621                 (progn
 622                   (smtpmail-send-command process (format "STARTTLS"))
 623                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 624                           (not (integerp (car response-code)))
 625                           (>= (car response-code) 400))
 626                       (throw 'done nil))
 627                   (starttls-negotiate process)
 628                   (setq do-starttls nil))
 629               (setq do-ehlo nil))))
 630
 631             (smtpmail-try-auth-methods process supported-extensions host port)
 632
 633             (if (or (member 'onex supported-extensions)
 634                     (member 'xone supported-extensions))
 635                 (progn
 636                   (smtpmail-send-command process (format "ONEX"))
 637                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 638                           (not (integerp (car response-code)))
 639                           (>= (car response-code) 400))
 640                       (throw 'done nil))))
 641
 642             (if (and smtpmail-debug-verb
 643                      (or (member 'verb supported-extensions)
 644                          (member 'xvrb supported-extensions)))
 645                 (progn
 646                   (smtpmail-send-command process (format "VERB"))
 647                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 648                           (not (integerp (car response-code)))
 649                           (>= (car response-code) 400))
 650                       (throw 'done nil))))
 651
 652             (if (member 'xusr supported-extensions)
 653                 (progn
 654                   (smtpmail-send-command process (format "XUSR"))
 655                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 656                           (not (integerp (car response-code)))
 657                           (>= (car response-code) 400))
 658                       (throw 'done nil))))
 659
 660             ;; MAIL FROM: <sender>
 661             (let ((size-part
 662                    (if (or (member 'size supported-extensions)
 663                            (assoc 'size supported-extensions))
 664                        (format " SIZE=%d"
 665                                (with-current-buffer smtpmail-text-buffer
 666                                  ;; size estimate:
 667                                  (+ (- (point-max) (point-min))
 668                                     ;; Add one byte for each change-of-line
 669                                     ;; because or CR-LF representation:
 670                                     (count-lines (point-min) (point-max))
 671                                     ;; For some reason, an empty line is
 672                                     ;; added to the message.  Maybe this
 673                                     ;; is a bug, but it can't hurt to add
 674                                     ;; those two bytes anyway:
 675                                     2)))
 676                      ""))
 677                   (body-part
 678                    (if (member '8bitmime supported-extensions)
 679                        ;; FIXME:
 680                        ;; Code should be added here that transforms
 681                        ;; the contents of the message buffer into
 682                        ;; something the receiving SMTP can handle.
 683                        ;; For a receiver that supports 8BITMIME, this
 684                        ;; may mean converting BINARY to BASE64, or
 685                        ;; adding Content-Transfer-Encoding and the
 686                        ;; other MIME headers.  The code should also
 687                        ;; return an indication of what encoding the
 688                        ;; message buffer is now, i.e. ASCII or
 689                        ;; 8BITMIME.
 690                        (if nil
 691                            " BODY=8BITMIME"
 692                          "")
 693                      "")))
 694 ;             (smtpmail-send-command process (format "MAIL FROM:%s@%s" (user-login-name) (smtpmail-fqdn)))
 695               (smtpmail-send-command process (format "MAIL FROM: <%s>%s%s"
 696                                                      envelope-from
 697                                                      size-part
 698                                                      body-part))
 699
 700               (if (or (null (car (setq response-code (smtpmail-read-response process))))
 701                       (not (integerp (car response-code)))
 702                       (>= (car response-code) 400))
 703                   (throw 'done nil)
 704                 ))
 705
 706             ;; RCPT TO: <recipient>
 707             (let ((n 0))
 708               (while (not (null (nth n recipient)))
 709                 (smtpmail-send-command process (format "RCPT TO: <%s>" (smtpmail-maybe-append-domain (nth n recipient))))
 710                 (setq n (1+ n))
 711
 712                 (setq response-code (smtpmail-read-response process))
 713                 (if (or (null (car response-code))
 714                         (not (integerp (car response-code)))
 715                         (>= (car response-code) 400))
 716                     (throw 'done nil)
 717                   )
 718                 ))
 719
 720             ;; DATA
 721             (smtpmail-send-command process "DATA")
 722
 723             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 724                     (not (integerp (car response-code)))
 725                     (>= (car response-code) 400))
 726                 (throw 'done nil)
 727               )
 728
 729             ;; Mail contents
 730             (smtpmail-send-data process smtpmail-text-buffer)
 731
 732             ;;DATA end "."
 733             (smtpmail-send-command process ".")
 734
 735             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 736                     (not (integerp (car response-code)))
 737                     (>= (car response-code) 400))
 738                 (throw 'done nil)
 739               )
 740
 741             ;;QUIT
 742 ;           (smtpmail-send-command process "QUIT")
 743 ;           (and (null (car (smtpmail-read-response process)))
 744 ;                (throw 'done nil))
 745             t ))
 746       (if process
 747           (with-current-buffer (process-buffer process)
 748             (smtpmail-send-command process "QUIT")
 749             (smtpmail-read-response process)
 750
 751 ;           (if (or (null (car (setq response-code (smtpmail-read-response process))))
 752 ;                   (not (integerp (car response-code)))
 753 ;                   (>= (car response-code) 400))
 754 ;               (throw 'done nil)
 755 ;             )
 756             (delete-process process)
 757             (unless smtpmail-debug-info
 758               (kill-buffer process-buffer)))))))
 759
 760
 761 (defun smtpmail-process-filter (process output)
 762   (with-current-buffer (process-buffer process)
 763     (goto-char (point-max))
 764     (insert output)))
 765
 766 (defun smtpmail-read-response (process)
 767   (let ((case-fold-search nil)
 768         (response-strings nil)
 769         (response-continue t)
 770         (return-value '(nil ()))
 771         match-end)
 772
 773     (while response-continue
 774       (goto-char smtpmail-read-point)
 775       (while (not (search-forward "\r\n" nil t))
 776         (accept-process-output process)
 777         (goto-char smtpmail-read-point))
 778
 779       (setq match-end (point))
 780       (setq response-strings
 781             (cons (buffer-substring smtpmail-read-point (- match-end 2))
 782                   response-strings))
 783
 784       (goto-char smtpmail-read-point)
 785       (if (looking-at "[0-9]+ ")
 786           (let ((begin (match-beginning 0))
 787                 (end (match-end 0)))
 788             (if smtpmail-debug-info
 789                 (message "%s" (car response-strings)))
 790
 791             (setq smtpmail-read-point match-end)
 792
 793             ;; ignore lines that start with "0"
 794             (if (looking-at "0[0-9]+ ")
 795                 nil
 796               (setq response-continue nil)
 797               (setq return-value
 798                     (cons (string-to-int
 799                            (buffer-substring begin end))
 800                           (nreverse response-strings)))))
 801
 802         (if (looking-at "[0-9]+-")
 803             (progn (if smtpmail-debug-info
 804                      (message "%s" (car response-strings)))
 805                    (setq smtpmail-read-point match-end)
 806                    (setq response-continue t))
 807           (progn
 808             (setq smtpmail-read-point match-end)
 809             (setq response-continue nil)
 810             (setq return-value
 811                   (cons nil (nreverse response-strings)))
 812             )
 813           )))
 814     (setq smtpmail-read-point match-end)
 815     return-value))
 816
 817
 818 (defun smtpmail-send-command (process command)
 819   (goto-char (point-max))
 820   (if (= (aref command 0) ?P)
 821       (insert "PASS <omitted>\r\n")
 822     (insert command "\r\n"))
 823   (setq smtpmail-read-point (point))
 824   (process-send-string process command)
 825   (process-send-string process "\r\n"))
 826
 827 (defun smtpmail-send-data-1 (process data)
 828   (goto-char (point-max))
 829
 830   (if (and (multibyte-string-p data)
 831            smtpmail-code-conv-from)
 832       (setq data (string-as-multibyte
 833                   (encode-coding-string data smtpmail-code-conv-from))))
 834
 835   (if smtpmail-debug-info
 836       (insert data "\r\n"))
 837
 838   (setq smtpmail-read-point (point))
 839   ;; Escape "." at start of a line
 840   (if (eq (string-to-char data) ?.)
 841       (process-send-string process "."))
 842   (process-send-string process data)
 843   (process-send-string process "\r\n")
 844   )
 845
 846 (defun smtpmail-send-data (process buffer)
 847   (let
 848       ((data-continue t)
 849        (sending-data nil)
 850        this-line
 851        this-line-end)
 852
 853     (with-current-buffer buffer
 854       (goto-char (point-min)))
 855
 856     (while data-continue
 857       (with-current-buffer buffer
 858         (beginning-of-line)
 859         (setq this-line (point))
 860         (end-of-line)
 861         (setq this-line-end (point))
 862         (setq sending-data nil)
 863         (setq sending-data (buffer-substring this-line this-line-end))
 864         (if (/= (forward-line 1) 0)
 865             (setq data-continue nil)))
 866
 867       (smtpmail-send-data-1 process sending-data)
 868       )
 869     )
 870   )
 871
 872
 873 (defun smtpmail-deduce-address-list (smtpmail-text-buffer header-start header-end)
 874   "Get address list suitable for smtp RCPT TO: <address>."
 875   (unwind-protect
 876       (with-current-buffer smtpmail-address-buffer
 877         (erase-buffer)
 878         (let
 879             ((case-fold-search t)
 880              (simple-address-list "")
 881              this-line
 882              this-line-end
 883              addr-regexp)
 884           (insert-buffer-substring smtpmail-text-buffer header-start header-end)
 885           (goto-char (point-min))
 886           ;; RESENT-* fields should stop processing of regular fields.
 887           (save-excursion
 888             (setq addr-regexp
 889                   (if (re-search-forward "^Resent-\\(to\\|cc\\|bcc\\):"
 890                                          header-end t)
 891                       "^Resent-\\(to\\|cc\\|bcc\\):"
 892                     "^\\(To:\\|Cc:\\|Bcc:\\)")))
 893
 894           (while (re-search-forward addr-regexp header-end t)
 895             (replace-match "")
 896             (setq this-line (match-beginning 0))
 897             (forward-line 1)
 898             ;; get any continuation lines
 899             (while (and (looking-at "^[ \t]+") (< (point) header-end))
 900               (forward-line 1))
 901             (setq this-line-end (point-marker))
 902             (setq simple-address-list
 903                   (concat simple-address-list " "
 904                           (mail-strip-quoted-names (buffer-substring this-line this-line-end))))
 905             )
 906           (erase-buffer)
 907           (insert " " simple-address-list "\n")
 908           (subst-char-in-region (point-min) (point-max) 10 ?  t);; newline --> blank
 909           (subst-char-in-region (point-min) (point-max) ?, ?  t);; comma   --> blank
 910           (subst-char-in-region (point-min) (point-max)  9 ?  t);; tab     --> blank
 911
 912           (goto-char (point-min))
 913           ;; tidyness in case hook is not robust when it looks at this
 914           (while (re-search-forward "[ \t]+" header-end t) (replace-match " "))
 915
 916           (goto-char (point-min))
 917           (let (recipient-address-list)
 918             (while (re-search-forward " \\([^ ]+\\) " (point-max) t)
 919               (backward-char 1)
 920               (setq recipient-address-list (cons (buffer-substring (match-beginning 1) (match-end 1))
 921                                                  recipient-address-list))
 922               )
 923             (setq smtpmail-recipient-address-list recipient-address-list))
 924
 925           )
 926         )
 927     )
 928   )
 929
 930
 931 (defun smtpmail-do-bcc (header-end)
 932   "Delete [Resent-]BCC: and their continuation lines from the header area.
 933 There may be multiple BCC: lines, and each may have arbitrarily
 934 many continuation lines."
 935   (let ((case-fold-search t))
 936     (save-excursion
 937       (goto-char (point-min))
 938       ;; iterate over all BCC: lines
 939       (while (re-search-forward "^\\(RESENT-\\)?BCC:" header-end t)
 940         (delete-region (match-beginning 0)
 941                        (progn (forward-line 1) (point)))
 942         ;; get rid of any continuation lines
 943         (while (and (looking-at "^[ \t].*\n") (< (point) header-end))
 944           (replace-match ""))))))
 945
 946
 947 (provide 'smtpmail)
 948
 949 ;;; smtpmail.el ends here