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, 2006, 2007,
   4 ;;   2008, 2009, 2010, 2011  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 3 of the License, or
  20 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  29
  30 ;;; Commentary:
  31
  32 ;; Send Mail to smtp host from smtpmail temp buffer.
  33
  34 ;; Please add these lines in your .emacs(_emacs) or use customize.
  35 ;;
  36 ;;(setq send-mail-function 'smtpmail-send-it) ; if you use `mail'
  37 ;;(setq message-send-mail-function 'smtpmail-send-it) ; if you use message/Gnus
  38 ;;(setq smtpmail-default-smtp-server "YOUR SMTP HOST")
  39 ;;(setq smtpmail-local-domain "YOUR DOMAIN NAME")
  40 ;;(setq smtpmail-sendto-domain "YOUR DOMAIN NAME")
  41 ;;(setq smtpmail-debug-info t) ; only to debug problems
  42 ;;(setq smtpmail-auth-credentials  ; or use ~/.authinfo
  43 ;;      '(("YOUR SMTP HOST" 25 "username" "password")))
  44 ;;(setq smtpmail-starttls-credentials
  45 ;;      '(("YOUR SMTP HOST" 25 "~/.my_smtp_tls.key" "~/.my_smtp_tls.cert")))
  46 ;; Where the 25 equals the value of `smtpmail-smtp-service', it can be an
  47 ;; integer or a string, just as long as they match (eq).
  48
  49 ;; To queue mail, set `smtpmail-queue-mail' to t and use
  50 ;; `smtpmail-send-queued-mail' to send.
  51
  52 ;; Modified by Stephen Cranefield <scranefield@infoscience.otago.ac.nz>,
  53 ;; 22/6/99, to support SMTP Authentication by the AUTH=LOGIN mechanism.
  54 ;; See http://help.netscape.com/products/server/messaging/3x/info/smtpauth.html
  55 ;; Rewritten by Simon Josefsson to use same credential variable as AUTH
  56 ;; support below.
  57
  58 ;; Modified by Simon Josefsson <jas@pdc.kth.se>, 22/2/99, to support SMTP
  59 ;; Authentication by the AUTH mechanism.
  60 ;; See http://www.ietf.org/rfc/rfc2554.txt
  61
  62 ;; Modified by Simon Josefsson <simon@josefsson.org>, 2000-10-07, to support
  63 ;; STARTTLS.  Requires external program
  64 ;; ftp://ftp.opaopa.org/pub/elisp/starttls-*.tar.gz.
  65 ;; See http://www.ietf.org/rfc/rfc2246.txt, http://www.ietf.org/rfc/rfc2487.txt
  66
  67 ;;; Code:
  68
  69 (require 'sendmail)
  70 (autoload 'starttls-any-program-available "starttls")
  71 (autoload 'starttls-open-stream "starttls")
  72 (autoload 'starttls-negotiate "starttls")
  73 (autoload 'mail-strip-quoted-names "mail-utils")
  74 (autoload 'message-make-date "message")
  75 (autoload 'message-make-message-id "message")
  76 (autoload 'rfc2104-hash "rfc2104")
  77 (autoload 'netrc-parse "netrc")
  78 (autoload 'netrc-machine "netrc")
  79 (autoload 'netrc-get "netrc")
  80 (autoload 'password-read "password-cache")
  81 (autoload 'auth-source-user-or-password "auth-source")
  82
  83 ;;;
  84 (defgroup smtpmail nil
  85   "SMTP protocol for sending mail."
  86   :group 'mail)
  87
  88
  89 (defcustom smtpmail-default-smtp-server nil
  90   "Specify default SMTP server.
  91 This only has effect if you specify it before loading the smtpmail library."
  92   :type '(choice (const nil) string)
  93   :group 'smtpmail)
  94
  95 (defcustom smtpmail-smtp-server
  96   (or (getenv "SMTPSERVER") smtpmail-default-smtp-server)
  97   "The name of the host running SMTP server."
  98   :type '(choice (const nil) string)
  99   :group 'smtpmail)
 100
 101 (defcustom smtpmail-smtp-service 25
 102   "SMTP service port number.
 103 The default value would be \"smtp\" or 25."
 104   :type '(choice (integer :tag "Port") (string :tag "Service"))
 105   :group 'smtpmail)
 106
 107 (defcustom smtpmail-local-domain nil
 108   "Local domain name without a host name.
 109 If the function `system-name' returns the full internet address,
 110 don't define this value."
 111   :type '(choice (const nil) string)
 112   :group 'smtpmail)
 113
 114 (defcustom smtpmail-sendto-domain nil
 115   "Local domain name without a host name.
 116 This is appended (with an @-sign) to any specified recipients which do
 117 not include an @-sign, so that each RCPT TO address is fully qualified.
 118 \(Some configurations of sendmail require this.)
 119
 120 Don't bother to set this unless you have get an error like:
 121         Sending failed; SMTP protocol error
 122 when sending mail, and the *trace of SMTP session to <somewhere>*
 123 buffer includes an exchange like:
 124         RCPT TO: <someone>
 125         501 <someone>: recipient address must contain a domain."
 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
 143   "Coding system for encoding outgoing mail.
 144 Used for the value of `sendmail-coding-system' when
 145 `select-message-coding-system' is called. "
 146   :type 'coding-system
 147   :group 'smtpmail)
 148
 149 (defcustom smtpmail-queue-mail nil
 150   "Non-nil means mail is queued; otherwise it is sent immediately.
 151 If queued, it is stored in the directory `smtpmail-queue-dir'
 152 and sent with `smtpmail-send-queued-mail'."
 153   :type 'boolean
 154   :group 'smtpmail)
 155
 156 (defcustom smtpmail-queue-dir "~/Mail/queued-mail/"
 157   "Directory where `smtpmail.el' stores queued mail."
 158   :type 'directory
 159   :group 'smtpmail)
 160
 161 (defcustom smtpmail-auth-credentials "~/.authinfo"
 162   "Specify username and password for servers, directly or via .netrc file.
 163 This variable can either be a filename pointing to a file in netrc(5)
 164 format, or list of four-element lists that contain, in order,
 165 `servername' (a string), `port' (an integer), `user' (a string) and
 166 `password' (a string, or nil to query the user when needed).  If you
 167 need to enter a `realm' too, add it to the user string, so that it
 168 looks like `user@realm'."
 169   :type '(choice file
 170                  (repeat (list (string  :tag "Server")
 171                                (integer :tag "Port")
 172                                (string  :tag "Username")
 173                                (choice (const :tag "Query when needed" nil)
 174                                        (string  :tag "Password")))))
 175   :version "22.1"
 176   :group 'smtpmail)
 177
 178 (defcustom smtpmail-starttls-credentials '(("" 25 "" ""))
 179   "Specify STARTTLS keys and certificates for servers.
 180 This is a list of four-element list with `servername' (a string),
 181 `port' (an integer), `key' (a filename) and `certificate' (a
 182 filename).
 183 If you do not have a certificate/key pair, leave the `key' and
 184 `certificate' fields as `nil'.  A key/certificate pair is only
 185 needed if you want to use X.509 client authenticated
 186 connections."
 187   :type '(repeat (list (string  :tag "Server")
 188                        (integer :tag "Port")
 189                        (file    :tag "Key")
 190                        (file    :tag "Certificate")))
 191   :version "21.1"
 192   :group 'smtpmail)
 193
 194 (defcustom smtpmail-warn-about-unknown-extensions nil
 195   "If set, print warnings about unknown SMTP extensions.
 196 This is mainly useful for development purposes, to learn about
 197 new SMTP extensions that might be useful to support."
 198   :type 'boolean
 199   :version "21.1"
 200   :group 'smtpmail)
 201
 202 (defcustom smtpmail-queue-index-file "index"
 203   "File name of queued mail index.
 204 This is relative to `smtpmail-queue-dir'."
 205   :type 'string
 206   :group 'smtpmail)
 207
 208 ;; End of customizable variables.
 209
 210
 211 (defvar smtpmail-address-buffer)
 212 (defvar smtpmail-recipient-address-list)
 213
 214 (defvar smtpmail-queue-counter 0)
 215
 216 ;; Buffer-local variable.
 217 (defvar smtpmail-read-point)
 218
 219 (defconst smtpmail-auth-supported '(cram-md5 plain login)
 220   "List of supported SMTP AUTH mechanisms.
 221 The list is in preference order.")
 222
 223 (defvar smtpmail-mail-address nil
 224   "Value to use for envelope-from address for mail from ambient buffer.")
 225
 226 ;;;###autoload
 227 (defun smtpmail-send-it ()
 228   (let ((errbuf (if mail-interactive
 229                     (generate-new-buffer " smtpmail errors")
 230                   0))
 231         (tembuf (generate-new-buffer " smtpmail temp"))
 232         (case-fold-search nil)
 233         delimline
 234         (mailbuf (current-buffer))
 235         ;; Examine this variable now, so that
 236         ;; local binding in the mail buffer will take effect.
 237         (smtpmail-mail-address
 238          (or (and mail-specify-envelope-from (mail-envelope-from))
 239              user-mail-address))
 240         (smtpmail-code-conv-from
 241          (if enable-multibyte-characters
 242              (let ((sendmail-coding-system smtpmail-code-conv-from))
 243                (select-message-coding-system)))))
 244     (unwind-protect
 245         (with-current-buffer tembuf
 246           (erase-buffer)
 247           ;; Use the same `buffer-file-coding-system' as in the mail
 248           ;; buffer, otherwise any `write-region' invocations (e.g., in
 249           ;; mail-do-fcc below) will annoy with asking for a suitable
 250           ;; encoding.
 251           (set-buffer-file-coding-system smtpmail-code-conv-from nil t)
 252           (insert-buffer-substring mailbuf)
 253           (goto-char (point-max))
 254           ;; require one newline at the end.
 255           (or (= (preceding-char) ?\n)
 256               (insert ?\n))
 257           ;; Change header-delimiter to be what sendmail expects.
 258           (mail-sendmail-undelimit-header)
 259           (setq delimline (point-marker))
 260           ;; (sendmail-synch-aliases)
 261           (if mail-aliases
 262               (expand-mail-aliases (point-min) delimline))
 263           (goto-char (point-min))
 264           ;; ignore any blank lines in the header
 265           (while (and (re-search-forward "\n\n\n*" delimline t)
 266                       (< (point) delimline))
 267             (replace-match "\n"))
 268           (let ((case-fold-search t))
 269             ;; We used to process Resent-... headers here,
 270             ;; but it was not done properly, and the job
 271             ;; is done correctly in `smtpmail-deduce-address-list'.
 272             ;; Don't send out a blank subject line
 273             (goto-char (point-min))
 274             (if (re-search-forward "^Subject:\\([ \t]*\n\\)+\\b" delimline t)
 275                 (replace-match "")
 276               ;; This one matches a Subject just before the header delimiter.
 277               (if (and (re-search-forward "^Subject:\\([ \t]*\n\\)+" delimline t)
 278                        (= (match-end 0) delimline))
 279                   (replace-match "")))
 280             ;; Put the "From:" field in unless for some odd reason
 281             ;; they put one in themselves.
 282             (goto-char (point-min))
 283             (if (not (re-search-forward "^From:" delimline t))
 284                 (let* ((login smtpmail-mail-address)
 285                        (fullname (user-full-name)))
 286                   (cond ((eq mail-from-style 'angles)
 287                          (insert "From: " fullname)
 288                          (let ((fullname-start (+ (point-min) 6))
 289                                (fullname-end (point-marker)))
 290                            (goto-char fullname-start)
 291                            ;; Look for a character that cannot appear unquoted
 292                            ;; according to RFC 822.
 293                            (if (re-search-forward "[^- !#-'*+/-9=?A-Z^-~]"
 294                                                   fullname-end 1)
 295                                (progn
 296                                  ;; Quote fullname, escaping specials.
 297                                  (goto-char fullname-start)
 298                                  (insert "\"")
 299                                  (while (re-search-forward "[\"\\]"
 300                                                            fullname-end 1)
 301                                    (replace-match "\\\\\\&" t))
 302                                  (insert "\""))))
 303                          (insert " <" login ">\n"))
 304                         ((eq mail-from-style 'parens)
 305                          (insert "From: " login " (")
 306                          (let ((fullname-start (point)))
 307                            (insert fullname)
 308                            (let ((fullname-end (point-marker)))
 309                              (goto-char fullname-start)
 310                              ;; RFC 822 says \ and nonmatching parentheses
 311                              ;; must be escaped in comments.
 312                              ;; Escape every instance of ()\ ...
 313                              (while (re-search-forward "[()\\]" fullname-end 1)
 314                                (replace-match "\\\\\\&" t))
 315                              ;; ... then undo escaping of matching parentheses,
 316                              ;; including matching nested parentheses.
 317                              (goto-char fullname-start)
 318                              (while (re-search-forward
 319                                      "\\(\\=\\|[^\\]\\(\\\\\\\\\\)*\\)\\\\(\\(\\([^\\]\\|\\\\\\\\\\)*\\)\\\\)"
 320                                      fullname-end 1)
 321                                (replace-match "\\1(\\3)" t)
 322                                (goto-char fullname-start))))
 323                          (insert ")\n"))
 324                         ((null mail-from-style)
 325                          (insert "From: " login "\n")))))
 326             ;; Insert a `Message-Id:' field if there isn't one yet.
 327             (goto-char (point-min))
 328             (unless (re-search-forward "^Message-Id:" delimline t)
 329               (insert "Message-Id: " (message-make-message-id) "\n"))
 330             ;; Insert a `Date:' field if there isn't one yet.
 331             (goto-char (point-min))
 332             (unless (re-search-forward "^Date:" delimline t)
 333               (insert "Date: " (message-make-date) "\n"))
 334             ;; Possibly add a MIME header for the current coding system
 335             (let (charset)
 336               (goto-char (point-min))
 337               (and (eq mail-send-nonascii 'mime)
 338                    (not (re-search-forward "^MIME-version:" delimline t))
 339                    (progn (skip-chars-forward "\0-\177")
 340                           (/= (point) (point-max)))
 341                    smtpmail-code-conv-from
 342                    (setq charset
 343                          (coding-system-get smtpmail-code-conv-from
 344                                             'mime-charset))
 345                    (goto-char delimline)
 346                    (insert "MIME-version: 1.0\n"
 347                            "Content-type: text/plain; charset="
 348                            (symbol-name charset)
 349                            "\nContent-Transfer-Encoding: 8bit\n")))
 350             ;; Insert an extra newline if we need it to work around
 351             ;; Sun's bug that swallows newlines.
 352             (goto-char (1+ delimline))
 353             (if (eval mail-mailer-swallows-blank-line)
 354                 (newline))
 355             ;; Find and handle any FCC fields.
 356             (goto-char (point-min))
 357             (if (re-search-forward "^FCC:" delimline t)
 358                 ;; Force `mail-do-fcc' to use the encoding of the mail
 359                 ;; buffer to encode outgoing messages on FCC files.
 360                 (let ((coding-system-for-write smtpmail-code-conv-from))
 361                   (mail-do-fcc delimline)))
 362             (if mail-interactive
 363                 (with-current-buffer errbuf
 364                   (erase-buffer))))
 365           ;;
 366           (setq smtpmail-address-buffer (generate-new-buffer "*smtp-mail*"))
 367           (setq smtpmail-recipient-address-list
 368                 (smtpmail-deduce-address-list tembuf (point-min) delimline))
 369           (kill-buffer smtpmail-address-buffer)
 370
 371           (smtpmail-do-bcc delimline)
 372           ;; Send or queue
 373           (if (not smtpmail-queue-mail)
 374               (if (not (null smtpmail-recipient-address-list))
 375                   (if (not (smtpmail-via-smtp
 376                             smtpmail-recipient-address-list tembuf))
 377                       (error "Sending failed; SMTP protocol error"))
 378                 (error "Sending failed; no recipients"))
 379             (let* ((file-data
 380                     (expand-file-name
 381                      (format "%s_%i"
 382                              (format-time-string "%Y-%m-%d_%H:%M:%S")
 383                              (setq smtpmail-queue-counter
 384                                    (1+ smtpmail-queue-counter)))
 385                      smtpmail-queue-dir))
 386                    (file-data (convert-standard-filename file-data))
 387                    (file-elisp (concat file-data ".el"))
 388                    (buffer-data (create-file-buffer file-data))
 389                    (buffer-elisp (create-file-buffer file-elisp))
 390                    (buffer-scratch "*queue-mail*"))
 391               (unless (file-exists-p smtpmail-queue-dir)
 392                 (make-directory smtpmail-queue-dir t))
 393               (with-current-buffer buffer-data
 394                 (erase-buffer)
 395                 (set-buffer-file-coding-system
 396                  ;; We will be reading the file with no-conversion in
 397                  ;; smtpmail-send-queued-mail below, so write it out
 398                  ;; with Unix EOLs.
 399                  (coding-system-change-eol-conversion
 400                   (or smtpmail-code-conv-from 'undecided)
 401                   'unix)
 402                  nil t)
 403                 (insert-buffer-substring tembuf)
 404                 (write-file file-data)
 405                 (set-buffer buffer-elisp)
 406                 (erase-buffer)
 407                 (insert (concat
 408                          "(setq smtpmail-recipient-address-list '"
 409                          (prin1-to-string smtpmail-recipient-address-list)
 410                          ")\n"))
 411                 (write-file file-elisp)
 412                 (set-buffer (generate-new-buffer buffer-scratch))
 413                 (insert (concat file-data "\n"))
 414                 (append-to-file (point-min)
 415                                 (point-max)
 416                                 (expand-file-name smtpmail-queue-index-file
 417                                                   smtpmail-queue-dir)))
 418               (kill-buffer buffer-scratch)
 419               (kill-buffer buffer-data)
 420               (kill-buffer buffer-elisp))))
 421       (kill-buffer tembuf)
 422       (if (bufferp errbuf)
 423           (kill-buffer errbuf)))))
 424
 425 ;;;###autoload
 426 (defun smtpmail-send-queued-mail ()
 427   "Send mail that was queued as a result of setting `smtpmail-queue-mail'."
 428   (interactive)
 429   (with-temp-buffer
 430     ;; Get index, get first mail, send it, update index, get second
 431     ;; mail, send it, etc...
 432     (let ((file-msg "")
 433           (qfile (expand-file-name smtpmail-queue-index-file
 434                                    smtpmail-queue-dir)))
 435       (insert-file-contents qfile)
 436       (goto-char (point-min))
 437       (while (not (eobp))
 438         (setq file-msg (buffer-substring (point) (line-end-position)))
 439         (load file-msg)
 440         ;; Insert the message literally: it is already encoded as per
 441         ;; the MIME headers, and code conversions might guess the
 442         ;; encoding wrongly.
 443         (with-temp-buffer
 444           (let ((coding-system-for-read 'no-conversion))
 445             (insert-file-contents file-msg))
 446           (let ((smtpmail-mail-address
 447                  (or (and mail-specify-envelope-from (mail-envelope-from))
 448                      user-mail-address)))
 449             (if (not (null smtpmail-recipient-address-list))
 450                 (if (not (smtpmail-via-smtp smtpmail-recipient-address-list
 451                                             (current-buffer)))
 452                     (error "Sending failed; SMTP protocol error"))
 453               (error "Sending failed; no recipients"))))
 454         (delete-file file-msg)
 455         (delete-file (concat file-msg ".el"))
 456         (delete-region (point-at-bol) (point-at-bol 2)))
 457       (write-region (point-min) (point-max) qfile))))
 458
 459 ;; (defun smtpmail-via-smtp (host,port,sender,destination,smtpmail-text-buffer)
 460
 461 (defun smtpmail-fqdn ()
 462   (if smtpmail-local-domain
 463       (concat (system-name) "." smtpmail-local-domain)
 464     (system-name)))
 465
 466 (defsubst smtpmail-cred-server (cred)
 467   (nth 0 cred))
 468
 469 (defsubst smtpmail-cred-port (cred)
 470   (nth 1 cred))
 471
 472 (defsubst smtpmail-cred-key (cred)
 473   (nth 2 cred))
 474
 475 (defsubst smtpmail-cred-user (cred)
 476   (nth 2 cred))
 477
 478 (defsubst smtpmail-cred-cert (cred)
 479   (nth 3 cred))
 480
 481 (defsubst smtpmail-cred-passwd (cred)
 482   (nth 3 cred))
 483
 484 (defun smtpmail-find-credentials (cred server port)
 485   (catch 'done
 486     (let ((l cred) el)
 487       (while (setq el (pop l))
 488         (when (and (equal server (smtpmail-cred-server el))
 489                    (equal port (smtpmail-cred-port el)))
 490           (throw 'done el))))))
 491
 492 (defun smtpmail-maybe-append-domain (recipient)
 493   (if (or (not smtpmail-sendto-domain)
 494           (string-match "@" recipient))
 495       recipient
 496     (concat recipient "@" smtpmail-sendto-domain)))
 497
 498 (defun smtpmail-intersection (list1 list2)
 499   (let ((result nil))
 500     (dolist (el2 list2)
 501       (when (memq el2 list1)
 502         (push el2 result)))
 503     (nreverse result)))
 504
 505 (defvar starttls-extra-args)
 506 (defvar starttls-extra-arguments)
 507
 508 (defun smtpmail-open-stream (process-buffer host port)
 509   (let ((cred (smtpmail-find-credentials
 510                smtpmail-starttls-credentials host port)))
 511     (if (null (and cred (starttls-any-program-available)))
 512         ;; The normal case.
 513         (open-network-stream "SMTP" process-buffer host port)
 514       (let* ((cred-key (smtpmail-cred-key cred))
 515              (cred-cert (smtpmail-cred-cert cred))
 516              (starttls-extra-args
 517               (append
 518                starttls-extra-args
 519                (when (and (stringp cred-key) (stringp cred-cert)
 520                           (file-regular-p
 521                            (setq cred-key (expand-file-name cred-key)))
 522                           (file-regular-p
 523                            (setq cred-cert (expand-file-name cred-cert))))
 524                  (list "--key-file" cred-key "--cert-file" cred-cert))))
 525              (starttls-extra-arguments
 526               (append
 527                starttls-extra-arguments
 528                (when (and (stringp cred-key) (stringp cred-cert)
 529                           (file-regular-p
 530                            (setq cred-key (expand-file-name cred-key)))
 531                           (file-regular-p
 532                            (setq cred-cert (expand-file-name cred-cert))))
 533                  (list "--x509keyfile" cred-key "--x509certfile" cred-cert)))))
 534         (starttls-open-stream "SMTP" process-buffer host port)))))
 535
 536 ;; `password-read' autoloads password-cache.
 537 (declare-function password-cache-add "password-cache" (key password))
 538
 539 (defun smtpmail-try-auth-methods (process supported-extensions host port)
 540   (let* ((mechs (cdr-safe (assoc 'auth supported-extensions)))
 541          (mech (car (smtpmail-intersection mechs smtpmail-auth-supported)))
 542          (auth-user (auth-source-user-or-password
 543                      "login" host (or port "smtp")))
 544          (auth-pass (auth-source-user-or-password
 545                      "password" host (or port "smtp")))
 546          (cred (if (and auth-user auth-pass) ; try user-auth-* before netrc-*
 547                    (list host port auth-user auth-pass)
 548                  ;; else, if auth-source didn't return them...
 549                  (if (stringp smtpmail-auth-credentials)
 550                      (let* ((netrc (netrc-parse smtpmail-auth-credentials))
 551                             (port-name (format "%s" (or port "smtp")))
 552                             (hostentry (netrc-machine netrc host port-name
 553                                                       port-name)))
 554                        (when hostentry
 555                          (list host port
 556                                (netrc-get hostentry "login")
 557                                (netrc-get hostentry "password"))))
 558                    ;; else, try `smtpmail-find-credentials' since
 559                    ;; `smtpmail-auth-credentials' is not a string
 560                    (smtpmail-find-credentials
 561                     smtpmail-auth-credentials host port))))
 562          (prompt (when cred (format "SMTP password for %s:%s: "
 563                                     (smtpmail-cred-server cred)
 564                                     (smtpmail-cred-port cred))))
 565          (passwd (when cred
 566                    (or (smtpmail-cred-passwd cred)
 567                        (password-read prompt prompt))))
 568          ret)
 569     (when (and cred mech)
 570       (cond
 571        ((eq mech 'cram-md5)
 572         (smtpmail-send-command process (upcase (format "AUTH %s" mech)))
 573         (if (or (null (car (setq ret (smtpmail-read-response process))))
 574                 (not (integerp (car ret)))
 575                 (>= (car ret) 400))
 576             (throw 'done nil))
 577         (when (eq (car ret) 334)
 578           (let* ((challenge (substring (cadr ret) 4))
 579                  (decoded (base64-decode-string challenge))
 580                  (hash (rfc2104-hash 'md5 64 16 passwd decoded))
 581                  (response (concat (smtpmail-cred-user cred) " " hash))
 582                  ;; Osamu Yamane <yamane@green.ocn.ne.jp>:
 583                  ;; SMTP auth fails because the SMTP server identifies
 584                  ;; only the first part of the string (delimited by
 585                  ;; new line characters) as a response from the
 586                  ;; client, and the rest as distinct commands.
 587
 588                  ;; In my case, the response string is 80 characters
 589                  ;; long.  Without the no-line-break option for
 590                  ;; `base64-encode-string', only the first 76 characters
 591                  ;; are taken as a response to the server, and the
 592                  ;; authentication fails.
 593                  (encoded (base64-encode-string response t)))
 594             (smtpmail-send-command process (format "%s" encoded))
 595             (if (or (null (car (setq ret (smtpmail-read-response process))))
 596                     (not (integerp (car ret)))
 597                     (>= (car ret) 400))
 598                 (throw 'done nil)))))
 599        ((eq mech 'login)
 600         (smtpmail-send-command process "AUTH LOGIN")
 601         (if (or (null (car (setq ret (smtpmail-read-response process))))
 602                 (not (integerp (car ret)))
 603                 (>= (car ret) 400))
 604             (throw 'done nil))
 605         (smtpmail-send-command
 606          process (base64-encode-string (smtpmail-cred-user cred) t))
 607         (if (or (null (car (setq ret (smtpmail-read-response process))))
 608                 (not (integerp (car ret)))
 609                 (>= (car ret) 400))
 610             (throw 'done nil))
 611         (smtpmail-send-command process (base64-encode-string passwd t))
 612         (if (or (null (car (setq ret (smtpmail-read-response process))))
 613                 (not (integerp (car ret)))
 614                 (>= (car ret) 400))
 615             (throw 'done nil)))
 616        ((eq mech 'plain)
 617         ;; We used to send an empty initial request, and wait for an
 618         ;; empty response, and then send the password, but this
 619         ;; violate a SHOULD in RFC 2222 paragraph 5.1.  Note that this
 620         ;; is not sent if the server did not advertise AUTH PLAIN in
 621         ;; the EHLO response.  See RFC 2554 for more info.
 622         (smtpmail-send-command process
 623                                (concat "AUTH PLAIN "
 624                                        (base64-encode-string
 625                                         (concat "\0"
 626                                                 (smtpmail-cred-user cred)
 627                                                 "\0"
 628                                                 passwd) t)))
 629         (if (or (null (car (setq ret (smtpmail-read-response process))))
 630                 (not (integerp (car ret)))
 631                 (not (equal (car ret) 235)))
 632             (throw 'done nil)))
 633
 634        (t
 635         (error "Mechanism %s not implemented" mech)))
 636       ;; Remember the password.
 637       (when (null (smtpmail-cred-passwd cred))
 638         (password-cache-add prompt passwd)))))
 639
 640 (defun smtpmail-via-smtp (recipient smtpmail-text-buffer)
 641   (let ((process nil)
 642         (host (or smtpmail-smtp-server
 643                   (error "`smtpmail-smtp-server' not defined")))
 644         (port smtpmail-smtp-service)
 645         ;; `smtpmail-mail-address' should be set to the appropriate
 646         ;; buffer-local value by the caller, but in case not:
 647         (envelope-from (or smtpmail-mail-address
 648                            (and mail-specify-envelope-from
 649                                 (mail-envelope-from))
 650                            user-mail-address))
 651         response-code
 652         greeting
 653         process-buffer
 654         (supported-extensions '()))
 655     (unwind-protect
 656         (catch 'done
 657           ;; get or create the trace buffer
 658           (setq process-buffer
 659                 (get-buffer-create (format "*trace of SMTP session to %s*" host)))
 660
 661           ;; clear the trace buffer of old output
 662           (with-current-buffer process-buffer
 663             (setq buffer-undo-list t)
 664             (erase-buffer))
 665
 666           ;; open the connection to the server
 667           (setq process (smtpmail-open-stream process-buffer host port))
 668           (and (null process) (throw 'done nil))
 669
 670           ;; set the send-filter
 671           (set-process-filter process 'smtpmail-process-filter)
 672
 673           (with-current-buffer process-buffer
 674             (set-buffer-process-coding-system 'raw-text-unix 'raw-text-unix)
 675             (make-local-variable 'smtpmail-read-point)
 676             (setq smtpmail-read-point (point-min))
 677
 678
 679             (if (or (null (car (setq greeting (smtpmail-read-response process))))
 680                     (not (integerp (car greeting)))
 681                     (>= (car greeting) 400))
 682                 (throw 'done nil))
 683
 684             (let ((do-ehlo t)
 685                   (do-starttls t))
 686               (while do-ehlo
 687                 ;; EHLO
 688                 (smtpmail-send-command process (format "EHLO %s" (smtpmail-fqdn)))
 689
 690                 (if (or (null (car (setq response-code
 691                                          (smtpmail-read-response process))))
 692                         (not (integerp (car response-code)))
 693                         (>= (car response-code) 400))
 694                     (progn
 695                       ;; HELO
 696                       (smtpmail-send-command
 697                        process (format "HELO %s" (smtpmail-fqdn)))
 698
 699                       (if (or (null (car (setq response-code
 700                                                (smtpmail-read-response process))))
 701                               (not (integerp (car response-code)))
 702                               (>= (car response-code) 400))
 703                           (throw 'done nil)))
 704                   (dolist (line (cdr (cdr response-code)))
 705                     (let ((name
 706                            (with-case-table ascii-case-table
 707                              (mapcar (lambda (s) (intern (downcase s)))
 708                                      (split-string (substring line 4) "[ ]")))))
 709                       (and (eq (length name) 1)
 710                            (setq name (car name)))
 711                       (and name
 712                            (cond ((memq (if (consp name) (car name) name)
 713                                         '(verb xvrb 8bitmime onex xone
 714                                                expn size dsn etrn
 715                                                enhancedstatuscodes
 716                                                help xusr
 717                                                auth=login auth starttls))
 718                                   (setq supported-extensions
 719                                         (cons name supported-extensions)))
 720                                  (smtpmail-warn-about-unknown-extensions
 721                                   (message "Unknown extension %s" name)))))))
 722
 723                 (if (and do-starttls
 724                          (smtpmail-find-credentials smtpmail-starttls-credentials host port)
 725                          (member 'starttls supported-extensions)
 726                          (numberp (process-id process)))
 727                     (progn
 728                       (smtpmail-send-command process (format "STARTTLS"))
 729                       (if (or (null (car (setq response-code (smtpmail-read-response process))))
 730                               (not (integerp (car response-code)))
 731                               (>= (car response-code) 400))
 732                           (throw 'done nil))
 733                       (starttls-negotiate process)
 734                       (setq do-starttls nil))
 735                   (setq do-ehlo nil))))
 736
 737             (smtpmail-try-auth-methods process supported-extensions host port)
 738
 739             (if (or (member 'onex supported-extensions)
 740                     (member 'xone supported-extensions))
 741                 (progn
 742                   (smtpmail-send-command process (format "ONEX"))
 743                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 744                           (not (integerp (car response-code)))
 745                           (>= (car response-code) 400))
 746                       (throw 'done nil))))
 747
 748             (if (and smtpmail-debug-verb
 749                      (or (member 'verb supported-extensions)
 750                          (member 'xvrb supported-extensions)))
 751                 (progn
 752                   (smtpmail-send-command process (format "VERB"))
 753                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 754                           (not (integerp (car response-code)))
 755                           (>= (car response-code) 400))
 756                       (throw 'done nil))))
 757
 758             (if (member 'xusr supported-extensions)
 759                 (progn
 760                   (smtpmail-send-command process (format "XUSR"))
 761                   (if (or (null (car (setq response-code (smtpmail-read-response process))))
 762                           (not (integerp (car response-code)))
 763                           (>= (car response-code) 400))
 764                       (throw 'done nil))))
 765
 766             ;; MAIL FROM:<sender>
 767             (let ((size-part
 768                    (if (or (member 'size supported-extensions)
 769                            (assoc 'size supported-extensions))
 770                        (format " SIZE=%d"
 771                                (with-current-buffer smtpmail-text-buffer
 772                                  ;; size estimate:
 773                                  (+ (- (point-max) (point-min))
 774                                     ;; Add one byte for each change-of-line
 775                                     ;; because of CR-LF representation:
 776                                     (count-lines (point-min) (point-max)))))
 777                      ""))
 778                   (body-part
 779                    (if (member '8bitmime supported-extensions)
 780                        ;; FIXME:
 781                        ;; Code should be added here that transforms
 782                        ;; the contents of the message buffer into
 783                        ;; something the receiving SMTP can handle.
 784                        ;; For a receiver that supports 8BITMIME, this
 785                        ;; may mean converting BINARY to BASE64, or
 786                        ;; adding Content-Transfer-Encoding and the
 787                        ;; other MIME headers.  The code should also
 788                        ;; return an indication of what encoding the
 789                        ;; message buffer is now, i.e. ASCII or
 790                        ;; 8BITMIME.
 791                        (if nil
 792                            " BODY=8BITMIME"
 793                          "")
 794                      "")))
 795               ;; (smtpmail-send-command process (format "MAIL FROM:%s@%s" (user-login-name) (smtpmail-fqdn)))
 796               (smtpmail-send-command process (format "MAIL FROM:<%s>%s%s"
 797                                                      envelope-from
 798                                                      size-part
 799                                                      body-part))
 800
 801               (if (or (null (car (setq response-code (smtpmail-read-response process))))
 802                       (not (integerp (car response-code)))
 803                       (>= (car response-code) 400))
 804                   (throw 'done nil)))
 805
 806             ;; RCPT TO:<recipient>
 807             (let ((n 0))
 808               (while (not (null (nth n recipient)))
 809                 (smtpmail-send-command process (format "RCPT TO:<%s>" (smtpmail-maybe-append-domain (nth n recipient))))
 810                 (setq n (1+ n))
 811
 812                 (setq response-code (smtpmail-read-response process))
 813                 (if (or (null (car response-code))
 814                         (not (integerp (car response-code)))
 815                         (>= (car response-code) 400))
 816                     (throw 'done nil))))
 817
 818             ;; DATA
 819             (smtpmail-send-command process "DATA")
 820
 821             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 822                     (not (integerp (car response-code)))
 823                     (>= (car response-code) 400))
 824                 (throw 'done nil))
 825
 826             ;; Mail contents
 827             (smtpmail-send-data process smtpmail-text-buffer)
 828
 829             ;; DATA end "."
 830             (smtpmail-send-command process ".")
 831
 832             (if (or (null (car (setq response-code (smtpmail-read-response process))))
 833                     (not (integerp (car response-code)))
 834                     (>= (car response-code) 400))
 835                 (throw 'done nil))
 836
 837             ;; QUIT
 838             ;; (smtpmail-send-command process "QUIT")
 839             ;; (and (null (car (smtpmail-read-response process)))
 840             ;;      (throw 'done nil))
 841             t))
 842       (if process
 843           (with-current-buffer (process-buffer process)
 844             (smtpmail-send-command process "QUIT")
 845             (smtpmail-read-response process)
 846
 847             ;; (if (or (null (car (setq response-code (smtpmail-read-response process))))
 848             ;;         (not (integerp (car response-code)))
 849             ;;         (>= (car response-code) 400))
 850             ;;     (throw 'done nil))
 851             (delete-process process)
 852             (unless smtpmail-debug-info
 853               (kill-buffer process-buffer)))))))
 854
 855
 856 (defun smtpmail-process-filter (process output)
 857   (with-current-buffer (process-buffer process)
 858     (goto-char (point-max))
 859     (insert output)))
 860
 861 (defun smtpmail-read-response (process)
 862   (let ((case-fold-search nil)
 863         (response-strings nil)
 864         (response-continue t)
 865         (return-value '(nil ()))
 866         match-end)
 867     (catch 'done
 868       (while response-continue
 869         (goto-char smtpmail-read-point)
 870         (while (not (search-forward "\r\n" nil t))
 871           (unless (memq (process-status process) '(open run))
 872             (throw 'done nil))
 873           (accept-process-output process)
 874           (goto-char smtpmail-read-point))
 875
 876         (setq match-end (point))
 877         (setq response-strings
 878               (cons (buffer-substring smtpmail-read-point (- match-end 2))
 879                     response-strings))
 880
 881         (goto-char smtpmail-read-point)
 882         (if (looking-at "[0-9]+ ")
 883             (let ((begin (match-beginning 0))
 884                   (end (match-end 0)))
 885               (if smtpmail-debug-info
 886                   (message "%s" (car response-strings)))
 887
 888               (setq smtpmail-read-point match-end)
 889
 890               ;; ignore lines that start with "0"
 891               (if (looking-at "0[0-9]+ ")
 892                   nil
 893                 (setq response-continue nil)
 894                 (setq return-value
 895                       (cons (string-to-number
 896                              (buffer-substring begin end))
 897                             (nreverse response-strings)))))
 898
 899           (if (looking-at "[0-9]+-")
 900               (progn (if smtpmail-debug-info
 901                          (message "%s" (car response-strings)))
 902                      (setq smtpmail-read-point match-end)
 903                      (setq response-continue t))
 904             (progn
 905               (setq smtpmail-read-point match-end)
 906               (setq response-continue nil)
 907               (setq return-value
 908                     (cons nil (nreverse response-strings)))))))
 909       (setq smtpmail-read-point match-end))
 910     return-value))
 911
 912
 913 (defun smtpmail-send-command (process command)
 914   (goto-char (point-max))
 915   (if (= (aref command 0) ?P)
 916       (insert "PASS <omitted>\r\n")
 917     (insert command "\r\n"))
 918   (setq smtpmail-read-point (point))
 919   (process-send-string process command)
 920   (process-send-string process "\r\n"))
 921
 922 (defun smtpmail-send-data-1 (process data)
 923   (goto-char (point-max))
 924
 925   (if (and (multibyte-string-p data)
 926            smtpmail-code-conv-from)
 927       (setq data (string-as-multibyte
 928                   (encode-coding-string data smtpmail-code-conv-from))))
 929
 930   (if smtpmail-debug-info
 931       (insert data "\r\n"))
 932
 933   (setq smtpmail-read-point (point))
 934   ;; Escape "." at start of a line
 935   (if (eq (string-to-char data) ?.)
 936       (process-send-string process "."))
 937   (process-send-string process data)
 938   (process-send-string process "\r\n"))
 939
 940 (defun smtpmail-send-data (process buffer)
 941   (let ((data-continue t) sending-data)
 942     (with-current-buffer buffer
 943       (goto-char (point-min)))
 944     (while data-continue
 945       (with-current-buffer buffer
 946         (setq sending-data (buffer-substring (point-at-bol) (point-at-eol)))
 947         (end-of-line 2)
 948         (setq data-continue (not (eobp))))
 949       (smtpmail-send-data-1 process sending-data))))
 950
 951 (defun smtpmail-deduce-address-list (smtpmail-text-buffer header-start header-end)
 952   "Get address list suitable for smtp RCPT TO: <address>."
 953   (unwind-protect
 954       (with-current-buffer smtpmail-address-buffer
 955         (erase-buffer)
 956         (let ((case-fold-search t)
 957               (simple-address-list "")
 958               this-line
 959               this-line-end
 960               addr-regexp)
 961           (insert-buffer-substring smtpmail-text-buffer header-start header-end)
 962           (goto-char (point-min))
 963           ;; RESENT-* fields should stop processing of regular fields.
 964           (save-excursion
 965             (setq addr-regexp
 966                   (if (re-search-forward "^Resent-\\(to\\|cc\\|bcc\\):"
 967                                          header-end t)
 968                       "^Resent-\\(to\\|cc\\|bcc\\):"
 969                     "^\\(To:\\|Cc:\\|Bcc:\\)")))
 970
 971           (while (re-search-forward addr-regexp header-end t)
 972             (replace-match "")
 973             (setq this-line (match-beginning 0))
 974             (forward-line 1)
 975             ;; get any continuation lines
 976             (while (and (looking-at "^[ \t]+") (< (point) header-end))
 977               (forward-line 1))
 978             (setq this-line-end (point-marker))
 979             (setq simple-address-list
 980                   (concat simple-address-list " "
 981                           (mail-strip-quoted-names (buffer-substring this-line this-line-end)))))
 982           (erase-buffer)
 983           (insert " " simple-address-list "\n")
 984           (subst-char-in-region (point-min) (point-max) 10 ?  t) ; newline --> blank
 985           (subst-char-in-region (point-min) (point-max) ?, ?  t) ; comma   --> blank
 986           (subst-char-in-region (point-min) (point-max)  9 ?  t) ; tab     --> blank
 987
 988           (goto-char (point-min))
 989           ;; tidyness in case hook is not robust when it looks at this
 990           (while (re-search-forward "[ \t]+" header-end t) (replace-match " "))
 991
 992           (goto-char (point-min))
 993           (let (recipient-address-list)
 994             (while (re-search-forward " \\([^ ]+\\) " (point-max) t)
 995               (backward-char 1)
 996               (setq recipient-address-list (cons (buffer-substring (match-beginning 1) (match-end 1))
 997                                                  recipient-address-list)))
 998             (setq smtpmail-recipient-address-list recipient-address-list))))))
 999
1000 (defun smtpmail-do-bcc (header-end)
1001   "Delete [Resent-]BCC: and their continuation lines from the header area.
1002 There may be multiple BCC: lines, and each may have arbitrarily
1003 many continuation lines."
1004   (let ((case-fold-search t))
1005     (save-excursion
1006       (goto-char (point-min))
1007       ;; iterate over all BCC: lines
1008       (while (re-search-forward "^\\(RESENT-\\)?BCC:" header-end t)
1009         (delete-region (match-beginning 0)
1010                        (progn (forward-line 1) (point)))
1011         ;; get rid of any continuation lines
1012         (while (and (looking-at "^[ \t].*\n") (< (point) header-end))
1013           (replace-match ""))))))
1014
1015 (provide 'smtpmail)
1016
1017 ;;; smtpmail.el ends here