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emacs/lisp/mail/smtpmail.el
Paul Eggert 5c7dd8a783 Update copyright year to 2018 
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;;; smtpmail.el --- simple SMTP protocol (RFC 821) for sending mail
;; Copyright (C) 1995-1996, 2001-2018 Free Software Foundation, Inc.
;; Author: Tomoji Kagatani <kagatani@rbc.ncl.omron.co.jp>
;; Maintainer: Simon Josefsson <simon@josefsson.org>
;; w32 Maintainer: Brian D. Carlstrom <bdc@ai.mit.edu>
;; ESMTP support: Simon Leinen <simon@switch.ch>
;; Hacked by Mike Taylor, 11th October 1999 to add support for
;; automatically appending a domain to RCPT TO: addresses.
;; AUTH=LOGIN support: Stephen Cranefield <scranefield@infoscience.otago.ac.nz>
;; Keywords: mail
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Send Mail to smtp host from smtpmail temp buffer.
;; Please add these lines in your .emacs(_emacs) or use customize.
;;
;;(setq send-mail-function 'smtpmail-send-it) ; if you use `mail'
;;(setq message-send-mail-function 'smtpmail-send-it) ; if you use message/Gnus
;;(setq smtpmail-smtp-server "YOUR SMTP HOST")
;;(setq smtpmail-local-domain "YOUR DOMAIN NAME")
;;(setq smtpmail-sendto-domain "YOUR DOMAIN NAME")
;;(setq smtpmail-debug-info t) ; only to debug problems
;; To queue mail, set `smtpmail-queue-mail' to t and use
;; `smtpmail-send-queued-mail' to send.
;; Modified by Stephen Cranefield <scranefield@infoscience.otago.ac.nz>,
;; 22/6/99, to support SMTP Authentication by the AUTH=LOGIN mechanism.
;; See http://help.netscape.com/products/server/messaging/3x/info/smtpauth.html
;; Rewritten by Simon Josefsson to use same credential variable as AUTH
;; support below.
;; Modified by Simon Josefsson <jas@pdc.kth.se>, 22/2/99, to support SMTP
;; Authentication by the AUTH mechanism.
;; See http://www.ietf.org/rfc/rfc2554.txt
;;; Code:
(require 'sendmail)
(require 'auth-source)
(autoload 'mail-strip-quoted-names "mail-utils")
(autoload 'message-make-date "message")
(autoload 'message-make-message-id "message")
(autoload 'rfc2104-hash "rfc2104")
;;;
(defgroup smtpmail nil
"SMTP protocol for sending mail."
:group 'mail)
(defcustom smtpmail-default-smtp-server nil
"Specify default SMTP server.
This only has effect if you specify it before loading the smtpmail library."
:type '(choice (const nil) string)
:group 'smtpmail)
(defcustom smtpmail-smtp-server
(or (getenv "SMTPSERVER") smtpmail-default-smtp-server)
"The name of the host running SMTP server."
:type '(choice (const nil) string)
:group 'smtpmail)
(defcustom smtpmail-smtp-service 25
"SMTP service port number.
The default value would be \"smtp\" or 25."
:type '(choice (integer :tag "Port") (string :tag "Service"))
:group 'smtpmail)
(defcustom smtpmail-smtp-user nil
"User name to use when looking up credentials in the authinfo file.
If non-nil, only consider credentials for the specified user."
:version "24.1"
:type '(choice (const nil) string)
:group 'smtpmail)
(defcustom smtpmail-local-domain nil
"Local domain name without a host name.
If the function `system-name' returns the full internet address,
don't define this value."
:type '(choice (const nil) string)
:group 'smtpmail)
(defcustom smtpmail-stream-type nil
"Type of SMTP connections to use.
This may be either nil (possibly upgraded to STARTTLS if possible),
or `starttls' (refuse to send if STARTTLS isn't available), or `plain'
\(never use STARTTLS), or `ssl' (to use TLS/SSL)."
:version "24.1"
:group 'smtpmail
:type '(choice (const :tag "Possibly upgrade to STARTTLS" nil)
(const :tag "Always use STARTTLS" starttls)
(const :tag "Never use STARTTLS" plain)
(const :tag "Use TLS/SSL" ssl)))
(defcustom smtpmail-sendto-domain nil
"Local domain name without a host name.
This is appended (with an @-sign) to any specified recipients which do
not include an @-sign, so that each RCPT TO address is fully qualified.
\(Some configurations of sendmail require this.)
Don't bother to set this unless you have get an error like:
Sending failed; 501 <someone>: recipient address must contain a domain."
:type '(choice (const nil) string)
:group 'smtpmail)
(defcustom smtpmail-debug-info nil
"Whether to print info in buffer *trace of SMTP session to <somewhere>*.
See also `smtpmail-debug-verb' which determines if the SMTP protocol should
be verbose as well."
:type 'boolean
:group 'smtpmail)
(defcustom smtpmail-debug-verb nil
"Whether this library sends the SMTP VERB command or not.
The commands enables verbose information from the SMTP server."
:type 'boolean
:group 'smtpmail)
(defcustom smtpmail-code-conv-from nil
"Coding system for encoding outgoing mail.
Used for the value of `sendmail-coding-system' when
`select-message-coding-system' is called. "
:type 'coding-system
:group 'smtpmail)
(defcustom smtpmail-queue-mail nil
"Non-nil means mail is queued; otherwise it is sent immediately.
If queued, it is stored in the directory `smtpmail-queue-dir'
and sent with `smtpmail-send-queued-mail'."
:type 'boolean
:group 'smtpmail)
(defcustom smtpmail-queue-dir "~/Mail/queued-mail/"
"Directory where `smtpmail.el' stores queued mail."
:type 'directory
:group 'smtpmail)
(defcustom smtpmail-warn-about-unknown-extensions nil
"If set, print warnings about unknown SMTP extensions.
This is mainly useful for development purposes, to learn about
new SMTP extensions that might be useful to support."
:type 'boolean
:version "21.1"
:group 'smtpmail)
(defcustom smtpmail-queue-index-file "index"
"File name of queued mail index.
This is relative to `smtpmail-queue-dir'."
:type 'string
:group 'smtpmail)
;; End of customizable variables.
(defvar smtpmail-address-buffer)
(defvar smtpmail-recipient-address-list)
(defvar smtpmail-queue-counter 0)
;; Buffer-local variable.
(defvar smtpmail-read-point)
(defconst smtpmail-auth-supported '(cram-md5 plain login)
"List of supported SMTP AUTH mechanisms.
The list is in preference order.")
(defvar smtpmail-mail-address nil
"Value to use for envelope-from address for mail from ambient buffer.")
;;;###autoload
(defun smtpmail-send-it ()
(let ((errbuf (if mail-interactive
(generate-new-buffer " smtpmail errors")
0))
(tembuf (generate-new-buffer " smtpmail temp"))
(case-fold-search nil)
delimline
result
(mailbuf (current-buffer))
;; Examine this variable now, so that
;; local binding in the mail buffer will take effect.
(smtpmail-mail-address
(or (and mail-specify-envelope-from (mail-envelope-from))
(let ((from (mail-fetch-field "from")))
(and from
(cadr (mail-extract-address-components from))))
(smtpmail-user-mail-address)))
(smtpmail-code-conv-from
(if enable-multibyte-characters
(let ((sendmail-coding-system smtpmail-code-conv-from))
(select-message-coding-system)))))
(unwind-protect
(with-current-buffer tembuf
(erase-buffer)
;; Use the same `buffer-file-coding-system' as in the mail
;; buffer, otherwise any `write-region' invocations (e.g., in
;; mail-do-fcc below) will annoy with asking for a suitable
;; encoding.
(set-buffer-file-coding-system smtpmail-code-conv-from nil t)
(insert-buffer-substring mailbuf)
(goto-char (point-max))
;; require one newline at the end.
(or (= (preceding-char) ?\n)
(insert ?\n))
;; Change header-delimiter to be what sendmail expects.
(mail-sendmail-undelimit-header)
(setq delimline (point-marker))
;; (sendmail-synch-aliases)
(if mail-aliases
(expand-mail-aliases (point-min) delimline))
(goto-char (point-min))
;; ignore any blank lines in the header
(while (and (re-search-forward "\n\n\n*" delimline t)
(< (point) delimline))
(replace-match "\n"))
(let ((case-fold-search t))
;; We used to process Resent-... headers here,
;; but it was not done properly, and the job
;; is done correctly in `smtpmail-deduce-address-list'.
;; Don't send out a blank subject line
(goto-char (point-min))
(if (re-search-forward "^Subject:\\([ \t]*\n\\)+\\b" delimline t)
(replace-match "")
;; This one matches a Subject just before the header delimiter.
(if (and (re-search-forward "^Subject:\\([ \t]*\n\\)+" delimline t)
(= (match-end 0) delimline))
(replace-match "")))
;; Put the "From:" field in unless for some odd reason
;; they put one in themselves.
(goto-char (point-min))
(if (not (re-search-forward "^From:" delimline t))
(let* ((login smtpmail-mail-address)
(fullname (user-full-name)))
(cond ((eq mail-from-style 'angles)
(insert "From: " fullname)
(let ((fullname-start (+ (point-min) 6))
(fullname-end (point-marker)))
(goto-char fullname-start)
;; Look for a character that cannot appear unquoted
;; according to RFC 822.
(if (re-search-forward "[^- !#-'*+/-9=?A-Z^-~]"
fullname-end 1)
(progn
;; Quote fullname, escaping specials.
(goto-char fullname-start)
(insert "\"")
(while (re-search-forward "[\"\\]"
fullname-end 1)
(replace-match "\\\\\\&" t))
(insert "\""))))
(insert " <" login ">\n"))
((eq mail-from-style 'parens)
(insert "From: " login " (")
(let ((fullname-start (point)))
(insert fullname)
(let ((fullname-end (point-marker)))
(goto-char fullname-start)
;; RFC 822 says \ and nonmatching parentheses
;; must be escaped in comments.
;; Escape every instance of ()\ ...
(while (re-search-forward "[()\\]" fullname-end 1)
(replace-match "\\\\\\&" t))
;; ... then undo escaping of matching parentheses,
;; including matching nested parentheses.
(goto-char fullname-start)
(while (re-search-forward
"\\(\\=\\|[^\\]\\(\\\\\\\\\\)*\\)\\\\(\\(\\([^\\]\\|\\\\\\\\\\)*\\)\\\\)"
fullname-end 1)
(replace-match "\\1(\\3)" t)
(goto-char fullname-start))))
(insert ")\n"))
((null mail-from-style)
(insert "From: " login "\n")))))
;; Insert a `Message-Id:' field if there isn't one yet.
(goto-char (point-min))
(unless (re-search-forward "^Message-Id:" delimline t)
(insert "Message-Id: " (message-make-message-id) "\n"))
;; Insert a `Date:' field if there isn't one yet.
(goto-char (point-min))
(unless (re-search-forward "^Date:" delimline t)
(insert "Date: " (message-make-date) "\n"))
;; Possibly add a MIME header for the current coding system
(let (charset)
(goto-char (point-min))
(and (eq mail-send-nonascii 'mime)
(not (re-search-forward "^MIME-version:" delimline t))
(progn (skip-chars-forward "\0-\177")
(/= (point) (point-max)))
smtpmail-code-conv-from
(setq charset
(coding-system-get smtpmail-code-conv-from
'mime-charset))
(goto-char delimline)
(insert "MIME-version: 1.0\n"
"Content-type: text/plain; charset="
(symbol-name charset)
"\nContent-Transfer-Encoding: 8bit\n")))
;; Insert an extra newline if we need it to work around
;; Sun's bug that swallows newlines.
(goto-char (1+ delimline))
(if (eval mail-mailer-swallows-blank-line)
(newline))
;; Find and handle any FCC fields.
(goto-char (point-min))
(if (re-search-forward "^FCC:" delimline t)
;; Force `mail-do-fcc' to use the encoding of the mail
;; buffer to encode outgoing messages on FCC files.
(let ((coding-system-for-write
;; mbox files must have Unix EOLs.
(coding-system-change-eol-conversion
smtpmail-code-conv-from 'unix)))
(mail-do-fcc delimline)))
(if mail-interactive
(with-current-buffer errbuf
(erase-buffer))))
;; Encode the header according to RFC2047.
(mail-encode-header (point-min) delimline)
;;
(setq smtpmail-address-buffer (generate-new-buffer "*smtp-mail*"))
(setq smtpmail-recipient-address-list
(smtpmail-deduce-address-list tembuf (point-min) delimline))
(kill-buffer smtpmail-address-buffer)
(smtpmail-do-bcc delimline)
;; Send or queue
(if (not smtpmail-queue-mail)
(if (not (null smtpmail-recipient-address-list))
(when (setq result
(smtpmail-via-smtp
smtpmail-recipient-address-list tembuf))
(error "Sending failed: %s" result))
(error "Sending failed; no recipients"))
(let* ((file-data
(expand-file-name
(format "%s_%i"
(format-time-string "%Y-%m-%d_%H:%M:%S")
(setq smtpmail-queue-counter
(1+ smtpmail-queue-counter)))
smtpmail-queue-dir))
(file-data (convert-standard-filename file-data))
(file-elisp (concat file-data ".el"))
(buffer-data (create-file-buffer file-data))
(buffer-elisp (create-file-buffer file-elisp))
(buffer-scratch "*queue-mail*"))
(unless (file-exists-p smtpmail-queue-dir)
(make-directory smtpmail-queue-dir t))
(with-current-buffer buffer-data
(erase-buffer)
(set-buffer-file-coding-system
;; We will be reading the file with no-conversion in
;; smtpmail-send-queued-mail below, so write it out
;; with Unix EOLs.
(coding-system-change-eol-conversion
(or smtpmail-code-conv-from 'undecided)
'unix)
nil t)
(insert-buffer-substring tembuf)
(write-file file-data)
(set-buffer buffer-elisp)
(erase-buffer)
(insert (concat
"(setq smtpmail-recipient-address-list '"
(prin1-to-string smtpmail-recipient-address-list)
")\n"))
(write-file file-elisp)
(set-buffer (generate-new-buffer buffer-scratch))
(insert (concat file-data "\n"))
(append-to-file (point-min)
(point-max)
(expand-file-name smtpmail-queue-index-file
smtpmail-queue-dir)))
(kill-buffer buffer-scratch)
(kill-buffer buffer-data)
(kill-buffer buffer-elisp))))
(kill-buffer tembuf)
(if (bufferp errbuf)
(kill-buffer errbuf)))))
;;;###autoload
(defun smtpmail-send-queued-mail ()
"Send mail that was queued as a result of setting `smtpmail-queue-mail'."
(interactive)
(with-temp-buffer
;; Get index, get first mail, send it, update index, get second
;; mail, send it, etc...
(let ((file-msg "")
(qfile (expand-file-name smtpmail-queue-index-file
smtpmail-queue-dir))
result)
(insert-file-contents qfile)
(goto-char (point-min))
(while (not (eobp))
(setq file-msg (buffer-substring (point) (line-end-position)))
(load file-msg)
;; Insert the message literally: it is already encoded as per
;; the MIME headers, and code conversions might guess the
;; encoding wrongly.
(with-temp-buffer
(let ((coding-system-for-read 'no-conversion))
(insert-file-contents file-msg))
(let ((smtpmail-mail-address
(or (and mail-specify-envelope-from (mail-envelope-from))
user-mail-address)))
(if (not (null smtpmail-recipient-address-list))
(when (setq result (smtpmail-via-smtp
smtpmail-recipient-address-list
(current-buffer)))
(error "Sending failed: %s" result))
(error "Sending failed; no recipients"))))
(delete-file file-msg)
(delete-file (concat file-msg ".el"))
(delete-region (point-at-bol) (point-at-bol 2)))
(write-region (point-min) (point-max) qfile))))
(defun smtpmail-fqdn ()
(if smtpmail-local-domain
(concat (system-name) "." smtpmail-local-domain)
(system-name)))
(defsubst smtpmail-cred-server (cred)
(nth 0 cred))
(defsubst smtpmail-cred-port (cred)
(nth 1 cred))
(defsubst smtpmail-cred-key (cred)
(nth 2 cred))
(defsubst smtpmail-cred-user (cred)
(nth 2 cred))
(defsubst smtpmail-cred-cert (cred)
(nth 3 cred))
(defsubst smtpmail-cred-passwd (cred)
(nth 3 cred))
(defun smtpmail-find-credentials (cred server port)
(catch 'done
(let ((l cred) el)
(while (setq el (pop l))
(when (and (equal server (smtpmail-cred-server el))
(equal port (smtpmail-cred-port el)))
(throw 'done el))))))
(defun smtpmail-maybe-append-domain (recipient)
(if (or (not smtpmail-sendto-domain)
(string-match "@" recipient))
recipient
(concat recipient "@" smtpmail-sendto-domain)))
(defun smtpmail-intersection (list1 list2)
(let ((result nil))
(dolist (el2 list2)
(when (memq el2 list1)
(push el2 result)))
(nreverse result)))
(defun smtpmail-command-or-throw (process string &optional code)
(let (ret)
(smtpmail-send-command process string)
(unless (smtpmail-ok-p (setq ret (smtpmail-read-response process))
code)
(throw 'done (format "%s in response to %s"
(smtpmail-response-text ret)
string)))
ret))
(defun smtpmail-try-auth-methods (process supported-extensions host port
&optional ask-for-password)
(setq port
(if port
(format "%s" port)
"smtp"))
(let* ((mechs (cdr-safe (assoc 'auth supported-extensions)))
(mech (car (smtpmail-intersection mechs smtpmail-auth-supported)))
(auth-source-creation-prompts
'((user . "SMTP user name for %h: ")
(secret . "SMTP password for %u@%h: ")))
(auth-info (car
(auth-source-search
:host host
:port port
:user smtpmail-smtp-user
:max 1
:require (and ask-for-password
'(:user :secret))
:create ask-for-password)))
(user (plist-get auth-info :user))
(password (plist-get auth-info :secret))
(save-function (and ask-for-password
(plist-get auth-info :save-function)))
ret)
(when (functionp password)
(setq password (funcall password)))
(when (and user
(not password))
;; The user has stored the user name, but not the password, so
;; ask for the password, even if we're not forcing that through
;; `ask-for-password'.
(setq auth-info
(car
(auth-source-search
:max 1
:host host
:port port
:user smtpmail-smtp-user
:require '(:user :secret)
:create t))
password (plist-get auth-info :secret)))
(when (functionp password)
(setq password (funcall password)))
(let ((result (catch 'done
(smtpmail-try-auth-method process mech user password))))
(if (stringp result)
(progn
(auth-source-forget+ :host host :port port)
(throw 'done result))
(when save-function
(funcall save-function))
result))))
(defun smtpmail-try-auth-method (process mech user password)
(let (ret)
(cond
((or (not mech)
(not user)
(not password))
;; No mechanism, or no credentials.
mech)
((eq mech 'cram-md5)
(setq ret (smtpmail-command-or-throw process "AUTH CRAM-MD5"))
(when (eq (car ret) 334)
(let* ((challenge (substring (cadr ret) 4))
(decoded (base64-decode-string challenge))
(hash (rfc2104-hash 'md5 64 16 password decoded))
(response (concat user " " hash))
;; Osamu Yamane <yamane@green.ocn.ne.jp>:
;; SMTP auth fails because the SMTP server identifies
;; only the first part of the string (delimited by
;; new line characters) as a response from the
;; client, and the rest as distinct commands.
;; In my case, the response string is 80 characters
;; long. Without the no-line-break option for
;; `base64-encode-string', only the first 76 characters
;; are taken as a response to the server, and the
;; authentication fails.
(encoded (base64-encode-string response t)))
(smtpmail-command-or-throw process encoded))))
((eq mech 'login)
(smtpmail-command-or-throw process "AUTH LOGIN")
(smtpmail-command-or-throw process (base64-encode-string user t))
(smtpmail-command-or-throw process (base64-encode-string password t)))
((eq mech 'plain)
;; We used to send an empty initial request, and wait for an
;; empty response, and then send the password, but this
;; violate a SHOULD in RFC 2222 paragraph 5.1. Note that this
;; is not sent if the server did not advertise AUTH PLAIN in
;; the EHLO response. See RFC 2554 for more info.
(smtpmail-command-or-throw
process
(concat "AUTH PLAIN "
(base64-encode-string (concat "\0" user "\0" password) t))
235))
(t
(error "Mechanism %s not implemented" mech)))))
(defun smtpmail-response-code (string)
(when string
(with-temp-buffer
(insert string)
(goto-char (point-min))
(and (re-search-forward "^\\([0-9]+\\) " nil t)
(string-to-number (match-string 1))))))
(defun smtpmail-ok-p (response &optional code)
(and (car response)
(integerp (car response))
(< (car response) 400)
(or (null code)
(= code (car response)))))
(defun smtpmail-response-text (response)
(mapconcat 'identity (cdr response) "\n"))
(defun smtpmail-query-smtp-server ()
"Query for an SMTP server and try to contact it.
If the contact succeeds, customizes and saves `smtpmail-smtp-server'
and `smtpmail-smtp-service'. This tries standard SMTP ports, and if
none works asks you to supply one. If you know that you need to use
a non-standard port, you can set `smtpmail-smtp-service' in advance.
Returns an error if the server cannot be contacted."
(let ((server (read-string "Outgoing SMTP mail server: "))
(ports '(25 587))
stream port prompted)
(when (and smtpmail-smtp-service
(not (member smtpmail-smtp-service ports)))
(push smtpmail-smtp-service ports))
(while (and (not smtpmail-smtp-server)
(setq port (pop ports)))
(if (not (setq stream (condition-case ()
(open-network-stream "smtp" nil server port)
(quit nil)
(error nil))))
;; We've used up the list of default ports, so query the user.
(when (and (not ports)
(not prompted))
(push (read-number (format "Port number to use when contacting %s? "
server))
ports)
(setq prompted t))
(customize-save-variable 'smtpmail-smtp-server server)
(customize-save-variable 'smtpmail-smtp-service port)
(delete-process stream)))
(unless smtpmail-smtp-server
(error "Couldn't contact an SMTP server"))))
(defun smtpmail-user-mail-address ()
"Return `user-mail-address' if it's a valid email address."
(and user-mail-address
(let ((parts (split-string user-mail-address "@")))
(and (= (length parts) 2)
;; There's a dot in the domain name.
(string-match "\\." (cadr parts))
user-mail-address))))
(defun smtpmail-via-smtp (recipient smtpmail-text-buffer
&optional ask-for-password)
(unless smtpmail-smtp-server
(smtpmail-query-smtp-server))
(let ((process nil)
(host (or smtpmail-smtp-server
(error "`smtpmail-smtp-server' not defined")))
(port smtpmail-smtp-service)
;; `smtpmail-mail-address' should be set to the appropriate
;; buffer-local value by the caller, but in case not:
(envelope-from
(or smtpmail-mail-address
(and mail-specify-envelope-from
(mail-envelope-from))
(let ((from (mail-fetch-field "from")))
(and from
(cadr (mail-extract-address-components from))))
(smtpmail-user-mail-address)))
response-code
process-buffer
result
auth-mechanisms
(supported-extensions '()))
(unwind-protect
(catch 'done
;; get or create the trace buffer
(setq process-buffer
(get-buffer-create
(format "*trace of SMTP session to %s*" host)))
;; clear the trace buffer of old output
(with-current-buffer process-buffer
(setq buffer-undo-list t)
(erase-buffer))
;; open the connection to the server
(let ((coding-system-for-read 'binary)
(coding-system-for-write 'binary))
(setq result
(open-network-stream
"smtpmail" process-buffer host port
:type smtpmail-stream-type
:return-list t
:warn-unless-encrypted ask-for-password
:capability-command (format "EHLO %s\r\n" (smtpmail-fqdn))
:end-of-command "^[0-9]+ .*\r\n"
:success "^2.*\n"
:always-query-capabilities t
:starttls-function
(lambda (capabilities)
(and (string-match "[ -]STARTTLS" capabilities)
"STARTTLS\r\n"))
:client-certificate t
:use-starttls-if-possible t)))
;; If we couldn't access the server at all, we give up.
(unless (setq process (car result))
(throw 'done (if (plist-get (cdr result) :error)
(plist-get (cdr result) :error)
"Unable to contact server")))
;; set the send-filter
(set-process-filter process 'smtpmail-process-filter)
(let* ((greeting (plist-get (cdr result) :greeting))
(code (smtpmail-response-code greeting)))
(unless code
(throw 'done (format "No greeting: %s" greeting)))
(when (>= code 400)
(throw 'done (format "Connection not allowed: %s" greeting))))
(with-current-buffer process-buffer
(set-buffer-process-coding-system 'raw-text-unix 'raw-text-unix)
(make-local-variable 'smtpmail-read-point)
(setq smtpmail-read-point (point-min))
(let* ((capabilities (plist-get (cdr result) :capabilities))
(code (smtpmail-response-code capabilities)))
(if (or (null code)
(>= code 400))
;; The server didn't accept EHLO, so we fall back on HELO.
(smtpmail-command-or-throw
process (format "HELO %s" (smtpmail-fqdn)))
;; EHLO was successful, so we parse the extensions.
(dolist (line (delete
""
(split-string
(plist-get (cdr result) :capabilities)
"\r\n")))
(let ((name
(with-case-table ascii-case-table ;FIXME: Why?
(mapcar (lambda (s) (intern (downcase s)))
(split-string (substring line 4) "[ ]")))))
(when (= (length name) 1)
(setq name (car name)))
(when name
(cond ((memq (if (consp name) (car name) name)
'(verb xvrb 8bitmime onex xone
expn size dsn etrn
enhancedstatuscodes
help xusr
auth=login auth starttls))
(setq supported-extensions
(cons name supported-extensions)))
(smtpmail-warn-about-unknown-extensions
(message "Unknown extension %s" name))))))))
(setq auth-mechanisms
(smtpmail-try-auth-methods
process supported-extensions host port
ask-for-password))
(when (or (member 'onex supported-extensions)
(member 'xone supported-extensions))
(smtpmail-command-or-throw process (format "ONEX")))
(when (and smtpmail-debug-verb
(or (member 'verb supported-extensions)
(member 'xvrb supported-extensions)))
(smtpmail-command-or-throw process (format "VERB")))
(when (member 'xusr supported-extensions)
(smtpmail-command-or-throw process (format "XUSR")))
;; MAIL FROM:<sender>
(let ((size-part
(if (or (member 'size supported-extensions)
(assoc 'size supported-extensions))
(format " SIZE=%d"
(with-current-buffer smtpmail-text-buffer
;; size estimate:
(+ (- (point-max) (point-min))
;; Add one byte for each change-of-line
;; because of CR-LF representation:
(count-lines (point-min) (point-max)))))
""))
(body-part
(if (member '8bitmime supported-extensions)
;; FIXME:
;; Code should be added here that transforms
;; the contents of the message buffer into
;; something the receiving SMTP can handle.
;; For a receiver that supports 8BITMIME, this
;; may mean converting BINARY to BASE64, or
;; adding Content-Transfer-Encoding and the
;; other MIME headers. The code should also
;; return an indication of what encoding the
;; message buffer is now, i.e. ASCII or
;; 8BITMIME.
(if nil
" BODY=8BITMIME"
"")
"")))
(smtpmail-send-command
process (format "MAIL FROM:<%s>%s%s"
envelope-from size-part body-part))
(cond
((smtpmail-ok-p (setq result (smtpmail-read-response process)))
;; Success.
)
((and auth-mechanisms
(not ask-for-password)
(eq (car result) 530))
;; We got a "530 auth required", so we close and try
;; again, this time asking the user for a password.
;; We ignore any errors here, because some MTAs just
;; close the connection immediately after giving the
;; error message.
(ignore-errors
(smtpmail-send-command process "QUIT")
(smtpmail-read-response process))
(delete-process process)
(setq process nil)
(throw 'done
(smtpmail-via-smtp recipient smtpmail-text-buffer t)))
(t
;; Return the error code.
(throw 'done
(smtpmail-response-text result)))))
;; RCPT TO:<recipient>
(let ((n 0))
(while (not (null (nth n recipient)))
(smtpmail-send-command
process (format "RCPT TO:<%s>"
(smtpmail-maybe-append-domain
(nth n recipient))))
(cond
((smtpmail-ok-p (setq result (smtpmail-read-response process)))
;; Success.
nil)
((and auth-mechanisms
(not ask-for-password)
(integerp (car result))
(>= (car result) 550)
(<= (car result) 554))
;; We got a "550 relay not permitted" (or the like),
;; and the server accepts credentials, so we try
;; again, but ask for a password first.
(smtpmail-send-command process "QUIT")
(smtpmail-read-response process)
(delete-process process)
(setq process nil)
(throw 'done
(smtpmail-via-smtp recipient smtpmail-text-buffer t)))
(t
;; Return the error code.
(throw 'done
(smtpmail-response-text result))))
(setq n (1+ n))))
;; Send the contents.
(smtpmail-command-or-throw process "DATA")
(smtpmail-send-data process smtpmail-text-buffer)
;; Return success.
nil))
(when (and process
(buffer-live-p process-buffer))
(with-current-buffer (process-buffer process)
(smtpmail-send-command process "QUIT")
(smtpmail-read-response process)
(delete-process process)
(unless smtpmail-debug-info
(kill-buffer process-buffer)))))))
(defun smtpmail-process-filter (process output)
(with-current-buffer (process-buffer process)
(goto-char (point-max))
(insert output)
(set-marker (process-mark process) (point))))
(defun smtpmail-read-response (process)
(let ((case-fold-search nil)
(response-strings nil)
(response-continue t)
(return-value '(nil ()))
match-end)
(catch 'done
(while response-continue
(goto-char smtpmail-read-point)
(while (not (search-forward "\r\n" nil t))
(unless (memq (process-status process) '(open run))
(throw 'done nil))
(accept-process-output process)
(goto-char smtpmail-read-point))
(setq match-end (point))
(setq response-strings
(cons (buffer-substring smtpmail-read-point (- match-end 2))
response-strings))
(goto-char smtpmail-read-point)
(if (looking-at "[0-9]+ ")
(let ((begin (match-beginning 0))
(end (match-end 0)))
(if smtpmail-debug-info
(message "%s" (car response-strings)))
(setq smtpmail-read-point match-end)
;; ignore lines that start with "0"
(if (looking-at "0[0-9]+ ")
nil
(setq response-continue nil)
(setq return-value
(cons (string-to-number
(buffer-substring begin end))
(nreverse response-strings)))))
(if (looking-at "[0-9]+-")
(progn (if smtpmail-debug-info
(message "%s" (car response-strings)))
(setq smtpmail-read-point match-end)
(setq response-continue t))
(progn
(setq smtpmail-read-point match-end)
(setq response-continue nil)
(setq return-value
(cons nil (nreverse response-strings)))))))
(setq smtpmail-read-point match-end))
return-value))
(defun smtpmail-send-command (process command)
(goto-char (point-max))
(if (string-match "\\`AUTH [A-Z]+ " command)
(insert (match-string 0 command) "<omitted>\r\n")
(insert command "\r\n"))
(setq smtpmail-read-point (point))
(process-send-string process (concat command "\r\n")))
(defun smtpmail-send-data-1 (process data)
(goto-char (point-max))
(if (and (multibyte-string-p data)
smtpmail-code-conv-from)
(setq data (string-as-multibyte
(encode-coding-string data smtpmail-code-conv-from))))
(if smtpmail-debug-info
(insert data "\r\n"))
(setq smtpmail-read-point (point))
;; Escape "." at start of a line
(if (eq (string-to-char data) ?.)
(process-send-string process "."))
(process-send-string process data)
(process-send-string process "\r\n"))
(defun smtpmail-send-data (process buffer)
(let ((data-continue t)
(pr (with-current-buffer buffer
(make-progress-reporter "Sending email "
(point-min) (point-max))))
sending-data)
(with-current-buffer buffer
(goto-char (point-min)))
(while data-continue
(with-current-buffer buffer
(progress-reporter-update pr (point))
(setq sending-data (buffer-substring (point-at-bol) (point-at-eol)))
(end-of-line 2)
(setq data-continue (not (eobp))))
(smtpmail-send-data-1 process sending-data))
;; DATA end "."
(smtpmail-command-or-throw process ".")
(progress-reporter-done pr)))
(defun smtpmail-deduce-address-list (smtpmail-text-buffer header-start header-end)
"Get address list suitable for smtp RCPT TO: <address>."
(unwind-protect
(with-current-buffer smtpmail-address-buffer
(erase-buffer)
(let ((case-fold-search t)
(simple-address-list "")
this-line
this-line-end
addr-regexp)
(insert-buffer-substring smtpmail-text-buffer header-start header-end)
(goto-char (point-min))
;; RESENT-* fields should stop processing of regular fields.
(save-excursion
(setq addr-regexp
(if (re-search-forward "^Resent-\\(to\\|cc\\|bcc\\):"
header-end t)
"^Resent-\\(to\\|cc\\|bcc\\):"
"^\\(To:\\|Cc:\\|Bcc:\\)")))
(while (re-search-forward addr-regexp header-end t)
(replace-match "")
(setq this-line (match-beginning 0))
(forward-line 1)
;; get any continuation lines
(while (and (looking-at "^[ \t]+") (< (point) header-end))
(forward-line 1))
(setq this-line-end (point-marker))
(setq simple-address-list
(concat simple-address-list " "
(mail-strip-quoted-names (buffer-substring this-line this-line-end)))))
(erase-buffer)
(insert " " simple-address-list "\n")
(subst-char-in-region (point-min) (point-max) 10 ? t) ; newline --> blank
(subst-char-in-region (point-min) (point-max) ?, ? t) ; comma --> blank
(subst-char-in-region (point-min) (point-max) 9 ? t) ; tab --> blank
(goto-char (point-min))
;; tidiness in case hook is not robust when it looks at this
(while (re-search-forward "[ \t]+" header-end t) (replace-match " "))
(goto-char (point-min))
(let (recipient-address-list)
(while (re-search-forward " \\([^ ]+\\) " (point-max) t)
(backward-char 1)
(setq recipient-address-list (cons (buffer-substring (match-beginning 1) (match-end 1))
recipient-address-list)))
(setq smtpmail-recipient-address-list recipient-address-list))))))
(defun smtpmail-do-bcc (header-end)
"Delete [Resent-]BCC: and their continuation lines from the header area.
There may be multiple BCC: lines, and each may have arbitrarily
many continuation lines."
(let ((case-fold-search t))
(save-excursion
(goto-char (point-min))
;; iterate over all BCC: lines
(while (re-search-forward "^\\(RESENT-\\)?BCC:" header-end t)
(delete-region (match-beginning 0)
(progn (forward-line 1) (point)))
;; get rid of any continuation lines
(while (and (looking-at "^[ \t].*\n") (< (point) header-end))
(replace-match ""))))))
(provide 'smtpmail)
;;; smtpmail.el ends here
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