lisp/mail/smtpmail.el

   1 ;;; smtpmail.el --- simple SMTP protocol (RFC 821) for sending mail
   2
   3 ;; Copyright (C) 1995, 1996, 2001, 2002, 2003, 2004, 2005
   4 ;;   Free Software Foundation, Inc.
   5
   6 ;; Author: Tomoji Kagatani <kagatani@rbc.ncl.omron.co.jp>
   7 ;; Maintainer: Simon Josefsson <simon@josefsson.org>
   8 ;; w32 Maintainer: Brian D. Carlstrom <bdc@ai.mit.edu>
   9 ;; ESMTP support: Simon Leinen <simon@switch.ch>
  10 ;; Hacked by Mike Taylor, 11th October 1999 to add support for
  11 ;; automatically appending a domain to RCPT TO: addresses.
  12 ;; AUTH=LOGIN support: Stephen Cranefield <scranefield@infoscience.otago.ac.nz>
  13 ;; Keywords: mail
  14
  15 ;; This file is part of GNU Emacs.
  16
  17 ;; GNU Emacs is free software; you can redistribute it and/or modify
  18 ;; it under the terms of the GNU General Public License as published by
  19 ;; the Free Software Foundation; either version 2, or (at your option)
  20 ;; any later version.
  21
  22 ;; GNU Emacs is distributed in the hope that it will be useful,
  23 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 ;; GNU General Public License for more details.
  26
  27 ;; You should have received a copy of the GNU General Public License
  28 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  29 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  30 ;; Boston, MA 02110-1301, USA.
  31
  32 ;;; Commentary:
  33
  34 ;; Send Mail to smtp host from smtpmail temp buffer.
  35
  36 ;; Please add these lines in your .emacs(_emacs) or use customize.
  37 ;;
  38 ;;(setq send-mail-function 'smtpmail-send-it) ; if you use `mail'
  39 ;;(setq message-send-mail-function 'smtpmail-send-it) ; if you use message/Gnus
  40 ;;(setq smtpmail-default-smtp-server "YOUR SMTP HOST")
  41 ;;(setq smtpmail-local-domain "YOUR DOMAIN NAME")
  42 ;;(setq smtpmail-sendto-domain "YOUR DOMAIN NAME")
  43 ;;(setq smtpmail-debug-info t) ; only to debug problems
  44 ;;(setq smtpmail-auth-credentials  ; or use ~/.authinfo
  45 ;;      '(("YOUR SMTP HOST" 25 "username" "password")))
  46 ;;(setq smtpmail-starttls-credentials
  47 ;;      '(("YOUR SMTP HOST" 25 "~/.my_smtp_tls.key" "~/.my_smtp_tls.cert")))
  48 ;; Where the 25 equals the value of `smtpmail-smtp-service', it can be an
  49 ;; integer or a string, just as long as they match (eq).
  50
  51 ;; To queue mail, set smtpmail-queue-mail to t and use
  52 ;; smtpmail-send-queued-mail to send.
  53
  54 ;; Modified by Stephen Cranefield <scranefield@infoscience.otago.ac.nz>,
  55 ;; 22/6/99, to support SMTP Authentication by the AUTH=LOGIN mechanism.
  56 ;; See http://help.netscape.com/products/server/messaging/3x/info/smtpauth.html
  57 ;; Rewritten by Simon Josefsson to use same credential variable as AUTH
  58 ;; support below.
  59
  60 ;; Modified by Simon Josefsson <jas@pdc.kth.se>, 22/2/99, to support SMTP
  61 ;; Authentication by the AUTH mechanism.
  62 ;; See http://www.ietf.org/rfc/rfc2554.txt
  63
  64 ;; Modified by Simon Josefsson <simon@josefsson.org>, 2000-10-07, to support
  65 ;; STARTTLS.  Requires external program
  66 ;; ftp://ftp.opaopa.org/pub/elisp/starttls-*.tar.gz.
  67 ;; See http://www.ietf.org/rfc/rfc2246.txt, http://www.ietf.org/rfc/rfc2487.txt
  68
  69 ;;; Code:
  70
  71 (require 'sendmail)
  72 (autoload 'starttls-open-stream "starttls")
  73 (autoload 'starttls-negotiate "starttls")
  74 (autoload 'mail-strip-quoted-names "mail-utils")
  75 (autoload 'message-make-date "message")
  76 (autoload 'message-make-message-id "message")
  77 (autoload 'rfc2104-hash "rfc2104")
  78 (autoload 'netrc-parse "netrc")
  79 (autoload 'netrc-machine "netrc")
  80 (autoload 'netrc-get "netrc")
  81
  82 ;;;
  83 (defgroup smtpmail nil
  84   "SMTP protocol for sending mail."
  85   :group 'mail)
  86
  87
  88 (defcustom smtpmail-default-smtp-server nil
  89   "*Specify default SMTP server.
  90 This only has effect if you specify it before loading the smtpmail library."
  91   :type '(choice (const nil) string)
  92   :group 'smtpmail)
  93
  94 (defcustom smtpmail-smtp-server
  95   (or (getenv "SMTPSERVER") smtpmail-default-smtp-server)
  96   "*The name of the host running SMTP server."
  97   :type '(choice (const nil) string)
  98   :group 'smtpmail)
  99
 100 (defcustom smtpmail-smtp-service 25
 101   "*SMTP service port number.
 102 The default value would be \"smtp\" or 25 ."
 103   :type '(choice (integer :tag "Port") (string :tag "Service"))
 104   :group 'smtpmail)
 105
 106 (defcustom smtpmail-local-domain nil
 107   "*Local domain name without a host name.
 108 If the function (system-name) returns the full internet address,
 109 don't define this value."
 110   :type '(choice (const nil) string)
 111   :group 'smtpmail)
 112
 113 (defcustom smtpmail-sendto-domain nil
 114   "*Local domain name without a host name.
 115 This is appended (with an @-sign) to any specified recipients which do
 116 not include an @-sign, so that each RCPT TO address is fully qualified.
 117 \(Some configurations of sendmail require this.)
 118
 119 Don't bother to set this unless you have get an error like:
 120         Sending failed; SMTP protocol error
 121 when sending mail, and the *trace of SMTP session to <somewhere>*
 122 buffer includes an exchange like:
 123         RCPT TO: <someone>
 124         501 <someone>: recipient address must contain a domain
 125 "
 126   :type '(choice (const nil) string)
 127   :group 'smtpmail)
 128
 129 (defcustom smtpmail-debug-info nil
 130   "Whether to print info in buffer *trace of SMTP session to <somewhere>*.
 131 See also `smtpmail-debug-verb' which determines if the SMTP protocol should
 132 be verbose as well."
 133   :type 'boolean
 134   :group 'smtpmail)
 135
 136 (defcustom smtpmail-debug-verb nil
 137   "Whether this library sends the SMTP VERB command or not.
 138 The commands enables verbose information from the SMTP server."
 139   :type 'boolean
 140   :group 'smtpmail)
 141
 142 (defcustom smtpmail-code-conv-from nil ;; *junet*
 143   "*smtpmail code convert from this code to *internal*..for tiny-mime.."
 144   :type 'boolean
 145   :group 'smtpmail)
 146
 147 (defcustom smtpmail-queue-mail nil
 148   "*Specify if mail is queued (if t) or sent immediately (if nil).
 149 If queued, it is stored in the directory `smtpmail-queue-dir'
 150 and sent with `smtpmail-send-queued-mail'."
 151   :type 'boolean
 152   :group 'smtpmail)
 153
 154 (defcustom smtpmail-queue-dir "~/Mail/queued-mail/"
 155   "*Directory where `smtpmail.el' stores queued mail."
 156   :type 'directory
 157   :group 'smtpmail)
 158
 159 (defcustom smtpmail-auth-credentials "~/.authinfo"
 160   "Specify username and password for servers, directly or via .netrc file.
 161 This variable can either be a filename pointing to a file in netrc(5)
 162 format, or list of four-element lists that contain, in order,
 163 `servername' (a string), `port' (an integer), `user' (a string) and
 164 `password' (a string, or nil to query the user when needed).  If you
 165 need to enter a `realm' too, add it to the user string, so that it
 166 looks like `user@realm'."
 167   :type '(choice file
 168                  (repeat (list (string  :tag "Server")
 169                        (integer :tag "Port")
 170                        (string  :tag "Username")
 171                        (choice (const :tag "Query when needed" nil)
 172                                        (string  :tag "Password")))))
 173   :version "22.1"
 174   :group 'smtpmail)
 175
 176 (defcustom smtpmail-starttls-credentials '(("" 25 "" ""))
 177   "Specify STARTTLS keys and certificates for servers.
 178 This is a list of four-element list with `servername' (a string),
 179 `port' (an integer), `key' (a filename) and `certificate' (a filename)."
 180   :type '(repeat (list (string  :tag "Server")
 181                        (integer :tag "Port")
 182                        (file    :tag "Key")
 183                        (file    :tag "Certificate")))
 184   :version "21.1"
 185   :group 'smtpmail)
 186
 187 (defcustom smtpmail-warn-about-unknown-extensions nil
 188   "*If set, print warnings about unknown SMTP extensions.
 189 This is mainly useful for development purposes, to learn about
 190 new SMTP extensions that might be useful to support."
 191   :type 'boolean
 192   :version "21.1"
 193   :group 'smtpmail)
 194
 195 (defvar smtpmail-queue-index-file "index"
 196   "File name of queued mail index,
 197 This is relative to `smtpmail-queue-dir'.")
 198
 199 (defvar smtpmail-address-buffer)
 200 (defvar smtpmail-recipient-address-list)
 201
 202 (defvar smtpmail-queue-counter 0)
 203
 204 ;; Buffer-local variable.
 205 (defvar smtpmail-read-point)
 206
 207 (defvar smtpmail-queue-index (concat smtpmail-queue-dir
 208                                      smtpmail-queue-index-file))
 209
 210 (defconst smtpmail-auth-supported '(cram-md5 login plain)
 211   "List of supported SMTP AUTH mechanisms.")
 212
 213 ;;;
 214 ;;;
 215 ;;;
 216
 217 (defvar smtpmail-mail-address nil
 218   "Value to use for envelope-from address for mail from ambient buffer.")
 219
 220 ;;;###autoload
 221 (defun smtpmail-send-it ()
 222   (let ((errbuf (if mail-interactive
 223                     (generate-new-buffer " smtpmail errors")
 224                   0))
 225         (tembuf (generate-new-buffer " smtpmail temp"))
 226         (case-fold-search nil)
 227         delimline
 228         (mailbuf (current-buffer))
 229         ;; Examine this variable now, so that
 230         ;; local binding in the mail buffer will take effect.
 231         (smtpmail-mail-address
 232          (or (and mail-specify-envelope-from (mail-envelope-from))
 233              user-mail-address))
 234         (smtpmail-code-conv-from
 235          (if enable-multibyte-characters
 236              (let ((sendmail-coding-system smtpmail-code-conv-from))
 237                (select-message-coding-system)))))
 238     (unwind-protect
 239         (save-excursion
 240           (set-buffer tembuf)
 241           (erase-buffer)
 242           (insert-buffer-substring mailbuf)
 243           (goto-char (point-max))
 244           ;; require one newline at the end.
 245           (or (= (preceding-char) ?\n)
 246               (insert ?\n))
 247           ;; Change header-delimiter to be what sendmail expects.
 248           (mail-sendmail-undelimit-header)
 249           (setq delimline (point-marker))
 250 ;;        (sendmail-synch-aliases)
 251           (if mail-aliases
 252               (expand-mail-aliases (point-min) delimline))
 253           (goto-char (point-min))
 254           ;; ignore any blank lines in the header
 255           (while (and (re-search-forward "\n\n\n*" delimline t)
 256                       (< (point) delimline))
 257             (replace-match "\n"))
 258           (let ((case-fold-search t))
 259             ;; We used to process Resent-... headers here,
 260             ;; but it was not done properly, and the job
 261             ;; is done correctly in smtpmail-deduce-address-list.
 262             ;; Don't send out a blank subject line
 263             (goto-char (point-min))
 264             (if (re-search-forward "^Subject:\\([ \t]*\n\\)+\\b" delimline t)
 265                 (replace-match "")
 266               ;; This one matches a Subject just before the header delimiter.
 267               (if (and (re-search-forward "^Subject:\\([ \t]*\n\\)+" delimline t)
 268                        (= (match-end 0) delimline))
 269                   (replace-match "")))
 270             ;; Put the "From:" field in unless for some odd reason
 271             ;; they put one in themselves.
 272             (goto-char (point-min))
 273             (if (not (re-search-forward "^From:" delimline t))
 274                 (let* ((login smtpmail-mail-address)
 275                        (fullname (user-full-name)))
 276                   (cond ((eq mail-from-style 'angles)
 277                          (insert "From: " fullname)
 278                          (let ((fullname-start (+ (point-min) 6))
 279                                (fullname-end (point-marker)))
 280                            (goto-char fullname-start)
 281                            ;; Look for a character that cannot appear unquoted
 282                            ;; according to RFC 822.
 283                            (if (re-search-forward "[^- !#-'*+/-9=?A-Z^-~]"
 284                                                   fullname-end 1)
 285                                (progn
 286                                  ;; Quote fullname, escaping specials.
 287                                  (goto-char fullname-start)
 288                                  (insert "\"")
 289                                  (while (re-search-forward "[\"\\]"
 290                                                            fullname-end 1)
 291                                    (replace-match "\\\\\\&" t))
 292                                  (insert "\""))))
 293                          (insert " <" login ">\n"))
 294                         ((eq mail-from-style 'parens)
 295                          (insert "From: " login " (")
 296                          (let ((fullname-start (point)))
 297                            (insert fullname)
 298                            (let ((fullname-end (point-marker)))
 299                              (goto-char fullname-start)
 300                              ;; RFC 822 says \ and nonmatching parentheses
 301                              ;; must be escaped in comments.
 302                              ;; Escape every instance of ()\ ...
 303                              (while (re-search-forward "[()\\]" fullname-end 1)
 304                                (replace-match "\\\\\\&" t))
 305                              ;; ... then undo escaping of matching parentheses,
 306                              ;; including matching nested parentheses.
 307                              (goto-char fullname-start)
 308                              (while (re-search-forward
 309                                      "\\(\\=\\|[^\\]\\(\\\\\\\\\\)*\\)\\\\(\\(\\([^\\]\\|\\\\\\\\\\)*\\)\\\\)"
 310                                      fullname-end 1)
 311                                (replace-match "\\1(\\3)" t)
 312                                (goto-char fullname-start))))
 313                          (insert ")\n"))
 314                         ((null mail-from-style)
 315                          (insert "From: " login "\n")))))
 316             ;; Insert a `Message-Id:' field if there isn't one yet.
 317             (goto-char (point-min))
 318             (unless (re-search-forward "^Message-Id:" delimline t)
 319               (insert "Message-Id: " (message-make-message-id) "\n"))
 320             ;; Insert a `Date:' field if there isn't one yet.
 321             (goto-char (point-min))
 322             (unless (re-search-forward "^Date:" delimline t)
 323               (insert "Date: " (message-make-date) "\n"))
 324             ;; Insert an extra newline if we need it to work around
 325             ;; Sun's bug that swallows newlines.
 326             (goto-char (1+ delimline))
 327             (if (eval mail-mailer-swallows-blank-line)
 328                 (newline))
 329             ;; Find and handle any FCC fields.
 330             (goto-char (point-min))
 331             (if (re-search-forward "^FCC:" delimline t)
 332                 (mail-do-fcc delimline))
 333             (if mail-interactive
 334                 (with-current-buffer errbuf
 335                   (erase-buffer))))
 336           ;;
 337           ;;
 338           ;;
 339           (setq smtpmail-address-buffer (generate-new-buffer "*smtp-mail*"))
 340           (setq smtpmail-recipient-address-list
 341                     (smtpmail-deduce-address-list tembuf (point-min) delimline))
 342           (kill-buffer smtpmail-address-buffer)
 343
 344           (smtpmail-do-bcc delimline)
 345           ; Send or queue
 346           (if (not smtpmail-queue-mail)
 347               (if (not (null smtpmail-recipient-address-list))
 348                   (if (not (smtpmail-via-smtp
 349                             smtpmail-recipient-address-list tembuf))
 350                       (error "Sending failed; SMTP protocol error"))
 351                 (error "Sending failed; no recipients"))
 352             (let* ((file-data
 353                     (expand-file-name
 354                      (format "%s_%i"
 355                              (format-time-string "%Y-%m-%d_%H:%M:%S")
 356                              (setq smtpmail-queue-counter
 357                                    (1+ smtpmail-queue-counter)))
 358                      smtpmail-queue-dir))
 359                    (file-data (convert-standard-filename file-data))
 360                    (file-elisp (concat file-data ".el"))
 361                    (buffer-data (create-file-buffer file-data))
 362                    (buffer-elisp (create-file-buffer file-elisp))
 363                    (buffer-scratch "*queue-mail*"))
 364               (unless (file-exists-p smtpmail-queue-dir)
 365                 (make-directory smtpmail-queue-dir t))
 366               (with-current-buffer buffer-data
 367                 (erase-buffer)
 368                 (insert-buffer tembuf)
 369                 (write-file file-data)
 370                 (set-buffer buffer-elisp)
 371                 (erase-buffer)
 372                 (insert (concat
 373                          "(setq smtpmail-recipient-address-list '"
 374                          (prin1-to-string smtpmail-recipient-address-list)
 375                          ")\n"))
 376                 (write-file file-elisp)
 377                 (set-buffer (generate-new-buffer buffer-scratch))
 378                 (insert (concat file-data "\n"))
 379                 (append-to-file (point-min)
 380                                 (point-max)
 381                                 smtpmail-queue-index)
 382                 )
 383               (kill-buffer buffer-scratch)
 384               (kill-buffer buffer-data)
 385               (kill-buffer buffer-elisp))))
 386       (kill-buffer tembuf)
 387       (if (bufferp errbuf)
 388           (kill-buffer errbuf)))))
 389
 390 ;;;###autoload
 391 (defun smtpmail-send-queued-mail ()
 392   "Send mail that was queued as a result of setting `smtpmail-queue-mail'."
 393   (interactive)
 394   (with-temp-buffer
 395     ;;; Get index, get first mail, send it, update index, get second
 396     ;;; mail, send it, etc...
 397     (let ((file-msg ""))
 398       (insert-file-contents smtpmail-queue-index)
 399       (goto-char (point-min))
 400       (while (not (eobp))
 401         (setq file-msg (buffer-substring (point) (line-end-position)))
 402         (load file-msg)
 403         ;; Insert the message literally: it is already encoded as per
 404         ;; the MIME headers, and code conversions might guess the
 405         ;; encoding wrongly.
 406         (with-temp-buffer
 407           (let ((coding-system-for-read 'no-conversion))
 408             (insert-file-contents file-msg))
 409           (let ((smtpmail-mail-address
 410                  (or (and mail-specify-envelope-from (mail-envelope-from))
 411                      user-mail-address)))
 412             (if (not (null smtpmail-recipient-address-list))
 413                 (if (not (smtpmail-via-smtp smtpmail-recipient-address-list
 414                                             (current-buffer)))
 415                     (error "Sending failed; SMTP protocol error"))
 416               (error "Sending failed; no recipients"))))
 417         (delete-file file-msg)
 418         (delete-file (concat file-msg ".el"))
 419         (delete-region (point-at-bol) (point-at-bol 2)))
 420       (write-region (point-min) (point-max) smtpmail-queue-index))))
 421
 422 ;(defun smtpmail-via-smtp (host,port,sender,destination,smtpmail-text-buffer)
 423
 424 (defun smtpmail-fqdn ()
 425   (if smtpmail-local-domain
 426       (concat (system-name) "." smtpmail-local-domain)
 427     (system-name)))
 428
 429 (defsubst smtpmail-cred-server (cred)
 430   (nth 0 cred))
 431
 432 (defsubst smtpmail-cred-port (cred)
 433   (nth 1 cred))
 434
 435 (defsubst smtpmail-cred-key (cred)
 436   (nth 2 cred))
 437
 438 (defsubst smtpmail-cred-user (cred)
 439   (nth 2 cred))
 440
 441 (defsubst smtpmail-cred-cert (cred)
 442   (nth 3 cred))
 443
 444 (defsubst smtpmail-cred-passwd (cred)
 445   (nth 3 cred))
 446
 447 (defun smtpmail-find-credentials (cred server port)
 448   (catch 'done
 449     (let ((l cred) el)
 450       (while (setq el (pop l))
 451         (when (and (equal server (smtpmail-cred-server el))
 452                    (equal port (smtpmail-cred-port el)))
 453           (throw 'done el))))))
 454
 455 (defun smtpmail-maybe-append-domain (recipient)
 456   (if (or (not smtpmail-sendto-domain)
 457           (string-match "@" recipient))
 458       recipient
 459     (concat recipient "@" smtpmail-sendto-domain)))
 460
 461 (defun smtpmail-intersection (list1 list2)
 462   (let ((result nil))
 463     (dolist (el2 list2)
 464       (when (memq el2 list1)
 465         (push el2 result)))
 466     (nreverse result)))
 467
 468 (defvar starttls-extra-args)
 469 (defvar starttls-extra-arguments)
 470
 471 (defun smtpmail-open-stream (process-buffer host port)
 472   (let ((cred (smtpmail-find-credentials
 473                smtpmail-starttls-credentials host port)))
 474     (if (null (and cred (condition-case ()
 475                             (with-no-warnings
 476                               (require 'starttls)
 477                               (call-process (if starttls-use-gnutls
 478                                                 starttls-gnutls-program
 479                                               starttls-program)))
 480                           (error nil))))
 481         ;; The normal case.
 482         (open-network-stream "SMTP" process-buffer host port)
 483       (let* ((cred-key (smtpmail-cred-key cred))
 484              (cred-cert (smtpmail-cred-cert cred))
 485              (starttls-extra-args
 486               (append
 487                starttls-extra-args
 488                (when (and (stringp cred-key) (stringp cred-cert)
 489                           (file-regular-p
 490                            (setq cred-key (expand-file-name cred-key)))
 491                           (file-regular-p
 492                            (setq cred-cert (expand-file-name cred-cert))))
 493                  (list "--key-file" cred-key "--cert-file" cred-cert))))
 494              (starttls-extra-arguments
 495               (append
 496                starttls-extra-arguments
 497                (when (and (stringp cred-key) (stringp cred-cert)
 498                           (file-regular-p
 499                            (setq cred-key (expand-file-name cred-key)))
 500                           (file-regular-p
 501                            (setq cred-cert (expand-file-name cred-cert))))
 502                  (list "--x509keyfile" cred-key "--x509certfile" cred-cert)))))
 503         (starttls-open-stream "SMTP" process-buffer host port)))))
 504
 505 (defun smtpmail-try-auth-methods (process supported-extensions host port)
 506   (let* ((mechs (cdr-safe (assoc 'auth supported-extensions)))
 507          (mech (car (smtpmail-intersection smtpmail-auth-supported mechs)))
 508          (cred (if (stringp smtpmail-auth-credentials)
 509                    (let* ((netrc (netrc-parse smtpmail-auth-credentials))
 510                           (port-name (format "%s" (or port "smtp")))
 511                           (hostentry (netrc-machine netrc host port-name
 512                                                     port-name)))
 513                      (when hostentry
 514                        (list host port
 515                              (netrc-get hostentry "login")
 516                              (netrc-get hostentry "password"))))
 517                  (smtpmail-find-credentials
 518                   smtpmail-auth-credentials host port)))
 519          (passwd (when cred
 520                    (or (smtpmail-cred-passwd cred)
 521                        (read-passwd
 522                         (format "SMTP password for %s:%s: "
 523                                 (smtpmail-cred-server cred)
 524                                 (smtpmail-cred-port cred))))))
 525          ret)
 526     (when (and cred mech)
 527       (cond
 528        ((eq mech 'cram-md5)
 529         (smtpmail-send-command process (upcase (format "AUTH %s" mech)))
 530         (if (or (null (car (setq ret (smtpmail-read-response process))))
 531                 (not (integerp (car ret)))
 532                 (>= (car ret) 400))
 533             (throw 'done nil))
 534         (when (eq (car ret) 334)
 535           (let* ((challenge (substring (cadr ret) 4))
 536                  (decoded (base64-decode-string challenge))
 537                  (hash (rfc2104-hash 'md5 64 16 passwd decoded))
 538                  (response (concat (smtpmail-cred-user cred) " " hash))
 539                  (encoded (base64-encode-string response)))
 540             (smtpmail-send-command process (format "%s" encoded))
 541             (if (or (null (car (setq ret (smtpmail-read-response process))))
 542                     (not (integerp (car ret)))
 543                     (>= (car ret) 400))
 544                 (throw 'done nil)))))
 545        ((eq mech 'login)
 546         (smtpmail-send-command process "AUTH LOGIN")
 547         (if (or (null (car (setq ret (smtpmail-read-response process))))
 548                 (not (integerp (car ret)))
 549                 (>= (car ret) 400))
 550             (throw 'done nil))
 551         (smtpmail-send-command
 552          process (base64-encode-string (smtpmail-cred-user cred)))
 553         (if (or (null (car (setq ret (smtpmail-read-response process))))
 554                 (not (integerp (car ret)))
 555                 (>= (car ret) 400))
 556             (throw 'done nil))
 557         (smtpmail-send-command process (base64-encode-string passwd))
 558         (if (or (null (car (setq ret (smtpmail-read-response process))))
 559                 (not (integerp (car ret)))
 560                 (>= (car ret) 400))
 561             (throw 'done nil)))
 562        ((eq mech 'plain)
 563         (smtpmail-send-command process "AUTH PLAIN")
 564         (if (or (null (car (setq ret (smtpmail-read-response process))))
 565                 (not (integerp (car ret)))
 566                 (not (equal (car ret) 334)))
 567             (throw 'done nil))
 568         (smtpmail-send-command process (base64-encode-string
 569                                         (concat "\0"
 570                                                 (smtpmail-cred-user cred)
 571                                                 "\0"
 572                                                 (smtpmail-cred-passwd cred))))
 573         (if (or (null (car (setq ret (smtpmail-read-response process))))
 574                 (not (integerp (car ret)))
 575                 (not (equal (car ret) 235)))
 576             (throw 'done nil)))
 577
 578        (t
 579         (error "Mechanism %s not implemented" mech)))
 580       ;; Remember the password.
 581       (when (and (not (stringp smtpmail-auth-credentials))
 582                  (null (smtpmail-cred-passwd cred)))
 583         (setcar (cdr (cdr (cdr cred))) passwd)))))
 584
 585 (defun smtpmail-via-smtp (recipient smtpmail-text-buffer)
 586   (let ((process nil)
 587         (host (or smtpmail-smtp-server
 588                   (error "`smtpmail-smtp-server' not defined")))
 589         (port smtpmail-smtp-service)
 590         ;; smtpmail-mail-address should be set to the appropriate
 591         ;; buffer-local value by the caller, but in case not:
 592         (envelope-from (or smtpmail-mail-address
 593                            (and mail-specify-envelope-from
 594                                 (mail-envelope-from))
 595                            user-mail-address))
 596         response-code
 597         greeting
 598         process-buffer
 599         (supported-extensions '()))
 600     (unwind-protect
 601         (catch 'done
 602           ;; get or create the trace buffer
 603           (setq process-buffer
 604                 (get-buffer-create (format "*trace of SMTP session to %s*" host)))
 605
 606           ;; clear the trace buffer of old output
 607           (with-current-buffer process-buffer
 608             (erase-buffer))
 609
 610           ;; open the connection to the server
 611           (setq process (smtpmail-open-stream process-buffer host port))
 612           (and (null process) (throw 'done nil))
 613
 614           ;; set the send-filter
 615           (set-process-filter process 'smtpmail-process-filter)
 616
 617           (with-current-buffer process-buffer
 618             (set-buffer-process-coding-system 'raw-text-unix 'raw-text-unix)
 619             (make-local-variable 'smtpmail-read-point)
 620             (setq smtpmail-read-point (point-min))
 621
 622
 623             (if (or (null (car (setq greeting (smtpmail-read-response process))))
 624                     (not (integerp (car greeting)))
 625                     (>= (car greeting) 400))
 626                 (throw 'done nil)
 627               )
 628
 629             (let ((do-ehlo t)
 630                   (do-starttls t))
 631               (while do-ehlo
 632             ;; EHLO
 633             (smtpmail-send-command process (format "EHLO %s" (smtpmail-fqdn)))
 634
 635             (if (or (null (car (setq response-code
 636                                      (smtpmail-read-response process))))
 637                     (not (integerp (car response-code)))
 638                     (>= (car response-code) 400))
 639                 (progn
 640                   ;; HELO
 641                   (smtpmail-send-command
 642                    process (format "HELO %s" (smtpmail-fqdn)))
 643
 644                   (if (or (null (car (setq response-code
 645                                            (smtpmail-read-response process))))
 646                           (not (integerp (car response-code)))
 647                           (>= (car response-code) 400))
 648                       (throw 'done nil)))
 649               (dolist (line (cdr (cdr response-code)))
 650                 (let ((name (mapcar (lambda (s) (intern (downcase s)))
 651                                     (split-string (substring line 4) "[ ]"))))
 652                   (and (eq (length name) 1)
 653                        (setq name (car name)))
 654                     (and name
 655                        (cond ((memq (if (consp name) (car name) name)
 656                                     '(verb xvrb 8bitmime onex xone
 657                                                   expn size dsn etrn
 658                                       enhancedstatuscodes
 659                                       help xusr
 660                                       auth=login auth starttls))
 661                                 (setq supported-extensions
 662                                       (cons name supported-extensions)))
 663                                (smtpmail-warn-about-unknown-extensions
 664                               (message "Unknown extension %s" name)))))))
 665
 666             (if (and do-starttls
 667                      (smtpmail-find-credentials smtpmail-starttls-credentials host port)
 668                      (member 'starttls supported-extensions)
 669                      (numberp (process-id process)))
 670                 (progn
 671                   (smtpmail-send-command process (format "STARTTLS"))
 672                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 673                           (not (integerp (car response-code)))
 674                           (>= (car response-code) 400))
 675                       (throw 'done nil))
 676                   (starttls-negotiate process)
 677                   (setq do-starttls nil))
 678               (setq do-ehlo nil))))
 679
 680             (smtpmail-try-auth-methods process supported-extensions host port)
 681
 682             (if (or (member 'onex supported-extensions)
 683                     (member 'xone supported-extensions))
 684                 (progn
 685                   (smtpmail-send-command process (format "ONEX"))
 686                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 687                           (not (integerp (car response-code)))
 688                           (>= (car response-code) 400))
 689                       (throw 'done nil))))
 690
 691             (if (and smtpmail-debug-verb
 692                      (or (member 'verb supported-extensions)
 693                          (member 'xvrb supported-extensions)))
 694                 (progn
 695                   (smtpmail-send-command process (format "VERB"))
 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             (if (member 'xusr supported-extensions)
 702                 (progn
 703                   (smtpmail-send-command process (format "XUSR"))
 704                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 705                           (not (integerp (car response-code)))
 706                           (>= (car response-code) 400))
 707                       (throw 'done nil))))
 708
 709             ;; MAIL FROM:<sender>
 710             (let ((size-part
 711                    (if (or (member 'size supported-extensions)
 712                            (assoc 'size supported-extensions))
 713                        (format " SIZE=%d"
 714                                (with-current-buffer smtpmail-text-buffer
 715                                  ;; size estimate:
 716                                  (+ (- (point-max) (point-min))
 717                                     ;; Add one byte for each change-of-line
 718                                     ;; because of CR-LF representation:
 719                                     (count-lines (point-min) (point-max)))))
 720                      ""))
 721                   (body-part
 722                    (if (member '8bitmime supported-extensions)
 723                        ;; FIXME:
 724                        ;; Code should be added here that transforms
 725                        ;; the contents of the message buffer into
 726                        ;; something the receiving SMTP can handle.
 727                        ;; For a receiver that supports 8BITMIME, this
 728                        ;; may mean converting BINARY to BASE64, or
 729                        ;; adding Content-Transfer-Encoding and the
 730                        ;; other MIME headers.  The code should also
 731                        ;; return an indication of what encoding the
 732                        ;; message buffer is now, i.e. ASCII or
 733                        ;; 8BITMIME.
 734                        (if nil
 735                            " BODY=8BITMIME"
 736                          "")
 737                      "")))
 738 ;             (smtpmail-send-command process (format "MAIL FROM:%s@%s" (user-login-name) (smtpmail-fqdn)))
 739               (smtpmail-send-command process (format "MAIL FROM:<%s>%s%s"
 740                                                      envelope-from
 741                                                      size-part
 742                                                      body-part))
 743
 744               (if (or (null (car (setq response-code (smtpmail-read-response process))))
 745                       (not (integerp (car response-code)))
 746                       (>= (car response-code) 400))
 747                   (throw 'done nil)
 748                 ))
 749
 750             ;; RCPT TO:<recipient>
 751             (let ((n 0))
 752               (while (not (null (nth n recipient)))
 753                 (smtpmail-send-command process (format "RCPT TO:<%s>" (smtpmail-maybe-append-domain (nth n recipient))))
 754                 (setq n (1+ n))
 755
 756                 (setq response-code (smtpmail-read-response process))
 757                 (if (or (null (car response-code))
 758                         (not (integerp (car response-code)))
 759                         (>= (car response-code) 400))
 760                     (throw 'done nil)
 761                   )
 762                 ))
 763
 764             ;; DATA
 765             (smtpmail-send-command process "DATA")
 766
 767             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 768                     (not (integerp (car response-code)))
 769                     (>= (car response-code) 400))
 770                 (throw 'done nil)
 771               )
 772
 773             ;; Mail contents
 774             (smtpmail-send-data process smtpmail-text-buffer)
 775
 776             ;;DATA end "."
 777             (smtpmail-send-command process ".")
 778
 779             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 780                     (not (integerp (car response-code)))
 781                     (>= (car response-code) 400))
 782                 (throw 'done nil)
 783               )
 784
 785             ;;QUIT
 786 ;           (smtpmail-send-command process "QUIT")
 787 ;           (and (null (car (smtpmail-read-response process)))
 788 ;                (throw 'done nil))
 789             t ))
 790       (if process
 791           (with-current-buffer (process-buffer process)
 792             (smtpmail-send-command process "QUIT")
 793             (smtpmail-read-response process)
 794
 795 ;           (if (or (null (car (setq response-code (smtpmail-read-response process))))
 796 ;                   (not (integerp (car response-code)))
 797 ;                   (>= (car response-code) 400))
 798 ;               (throw 'done nil)
 799 ;             )
 800             (delete-process process)
 801             (unless smtpmail-debug-info
 802               (kill-buffer process-buffer)))))))
 803
 804
 805 (defun smtpmail-process-filter (process output)
 806   (with-current-buffer (process-buffer process)
 807     (goto-char (point-max))
 808     (insert output)))
 809
 810 (defun smtpmail-read-response (process)
 811   (let ((case-fold-search nil)
 812         (response-strings nil)
 813         (response-continue t)
 814         (return-value '(nil ()))
 815         match-end)
 816     (catch 'done
 817       (while response-continue
 818         (goto-char smtpmail-read-point)
 819         (while (not (search-forward "\r\n" nil t))
 820           (unless (memq (process-status process) '(open run))
 821             (throw 'done nil))
 822           (accept-process-output process)
 823           (goto-char smtpmail-read-point))
 824
 825         (setq match-end (point))
 826         (setq response-strings
 827               (cons (buffer-substring smtpmail-read-point (- match-end 2))
 828                     response-strings))
 829
 830         (goto-char smtpmail-read-point)
 831         (if (looking-at "[0-9]+ ")
 832             (let ((begin (match-beginning 0))
 833                   (end (match-end 0)))
 834               (if smtpmail-debug-info
 835                   (message "%s" (car response-strings)))
 836
 837               (setq smtpmail-read-point match-end)
 838
 839               ;; ignore lines that start with "0"
 840               (if (looking-at "0[0-9]+ ")
 841                   nil
 842                 (setq response-continue nil)
 843                 (setq return-value
 844                       (cons (string-to-number
 845                              (buffer-substring begin end))
 846                             (nreverse response-strings)))))
 847
 848           (if (looking-at "[0-9]+-")
 849               (progn (if smtpmail-debug-info
 850                          (message "%s" (car response-strings)))
 851                      (setq smtpmail-read-point match-end)
 852                      (setq response-continue t))
 853             (progn
 854               (setq smtpmail-read-point match-end)
 855               (setq response-continue nil)
 856               (setq return-value
 857                     (cons nil (nreverse response-strings)))))))
 858       (setq smtpmail-read-point match-end))
 859     return-value))
 860
 861
 862 (defun smtpmail-send-command (process command)
 863   (goto-char (point-max))
 864   (if (= (aref command 0) ?P)
 865       (insert "PASS <omitted>\r\n")
 866     (insert command "\r\n"))
 867   (setq smtpmail-read-point (point))
 868   (process-send-string process command)
 869   (process-send-string process "\r\n"))
 870
 871 (defun smtpmail-send-data-1 (process data)
 872   (goto-char (point-max))
 873
 874   (if (and (multibyte-string-p data)
 875            smtpmail-code-conv-from)
 876       (setq data (string-as-multibyte
 877                   (encode-coding-string data smtpmail-code-conv-from))))
 878
 879   (if smtpmail-debug-info
 880       (insert data "\r\n"))
 881
 882   (setq smtpmail-read-point (point))
 883   ;; Escape "." at start of a line
 884   (if (eq (string-to-char data) ?.)
 885       (process-send-string process "."))
 886   (process-send-string process data)
 887   (process-send-string process "\r\n")
 888   )
 889
 890 (defun smtpmail-send-data (process buffer)
 891   (let ((data-continue t) sending-data)
 892     (with-current-buffer buffer
 893       (goto-char (point-min)))
 894     (while data-continue
 895       (with-current-buffer buffer
 896         (setq sending-data (buffer-substring (point-at-bol) (point-at-eol)))
 897         (end-of-line 2)
 898         (setq data-continue (not (eobp))))
 899       (smtpmail-send-data-1 process sending-data))))
 900
 901 (defun smtpmail-deduce-address-list (smtpmail-text-buffer header-start header-end)
 902   "Get address list suitable for smtp RCPT TO: <address>."
 903   (unwind-protect
 904       (with-current-buffer smtpmail-address-buffer
 905         (erase-buffer)
 906         (let
 907             ((case-fold-search t)
 908              (simple-address-list "")
 909              this-line
 910              this-line-end
 911              addr-regexp)
 912           (insert-buffer-substring smtpmail-text-buffer header-start header-end)
 913           (goto-char (point-min))
 914           ;; RESENT-* fields should stop processing of regular fields.
 915           (save-excursion
 916             (setq addr-regexp
 917                   (if (re-search-forward "^Resent-\\(to\\|cc\\|bcc\\):"
 918                                          header-end t)
 919                       "^Resent-\\(to\\|cc\\|bcc\\):"
 920                     "^\\(To:\\|Cc:\\|Bcc:\\)")))
 921
 922           (while (re-search-forward addr-regexp header-end t)
 923             (replace-match "")
 924             (setq this-line (match-beginning 0))
 925             (forward-line 1)
 926             ;; get any continuation lines
 927             (while (and (looking-at "^[ \t]+") (< (point) header-end))
 928               (forward-line 1))
 929             (setq this-line-end (point-marker))
 930             (setq simple-address-list
 931                   (concat simple-address-list " "
 932                           (mail-strip-quoted-names (buffer-substring this-line this-line-end))))
 933             )
 934           (erase-buffer)
 935           (insert " " simple-address-list "\n")
 936           (subst-char-in-region (point-min) (point-max) 10 ?  t);; newline --> blank
 937           (subst-char-in-region (point-min) (point-max) ?, ?  t);; comma   --> blank
 938           (subst-char-in-region (point-min) (point-max)  9 ?  t);; tab     --> blank
 939
 940           (goto-char (point-min))
 941           ;; tidyness in case hook is not robust when it looks at this
 942           (while (re-search-forward "[ \t]+" header-end t) (replace-match " "))
 943
 944           (goto-char (point-min))
 945           (let (recipient-address-list)
 946             (while (re-search-forward " \\([^ ]+\\) " (point-max) t)
 947               (backward-char 1)
 948               (setq recipient-address-list (cons (buffer-substring (match-beginning 1) (match-end 1))
 949                                                  recipient-address-list))
 950               )
 951             (setq smtpmail-recipient-address-list recipient-address-list))
 952
 953           )
 954         )
 955     )
 956   )
 957
 958
 959 (defun smtpmail-do-bcc (header-end)
 960   "Delete [Resent-]BCC: and their continuation lines from the header area.
 961 There may be multiple BCC: lines, and each may have arbitrarily
 962 many continuation lines."
 963   (let ((case-fold-search t))
 964     (save-excursion
 965       (goto-char (point-min))
 966       ;; iterate over all BCC: lines
 967       (while (re-search-forward "^\\(RESENT-\\)?BCC:" header-end t)
 968         (delete-region (match-beginning 0)
 969                        (progn (forward-line 1) (point)))
 970         ;; get rid of any continuation lines
 971         (while (and (looking-at "^[ \t].*\n") (< (point) header-end))
 972           (replace-match ""))))))
 973
 974
 975 (provide 'smtpmail)
 976
 977 ;;; arch-tag: a76992df-6d71-43b7-9e72-4bacc6c05466
 978 ;;; smtpmail.el ends here