1 ;;; pop3.el --- Post Office Protocol (RFC 1460) interface
3 ;; Copyright (C) 1996,1997,1998 Free Software Foundation, Inc.
5 ;; Author: Richard L. Pieri <ratinox@peorth.gweep.net>
6 ;; Keywords: mail, pop3
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
28 ;; Most of the standard Post Office Protocol version 3 (RFC 1460) commands
29 ;; are implemented. The LIST command has not been implemented due to lack
30 ;; of actual usefulness.
31 ;; The optional POP3 command TOP has not been implemented.
33 ;; This program was inspired by Kyle E. Jones's vm-pop program.
40 (defconst pop3-version "1.3m+")
42 (defvar pop3-maildrop (or (user-login-name) (getenv "LOGNAME") (getenv "USER") nil)
44 (defvar pop3-mailhost (or (getenv "MAILHOST") nil)
49 (defvar pop3-password-required t
50 "*Non-nil if a password is required when connecting to POP server.")
51 (defvar pop3-password nil
52 "*Password to use when connecting to POP server.")
54 (defvar pop3-authentication-scheme 'pass
55 "*POP3 authentication scheme.
56 Defaults to 'pass, for the standard USER/PASS authentication. Other valid
59 (defvar pop3-timestamp nil
60 "Timestamp returned when initially connected to the POP server.
61 Used for APOP authentication.")
63 (defvar pop3-movemail-file-coding-system 'binary
64 "Crashbox made by pop3-movemail with this coding system.")
66 (defvar pop3-read-point nil)
67 (defvar pop3-debug nil)
69 (defun pop3-movemail (&optional crashbox)
70 "Transfer contents of a maildrop to the specified CRASHBOX."
71 (or crashbox (setq crashbox (expand-file-name "~/.crashbox")))
72 (let* ((process (pop3-open-server pop3-mailhost pop3-port))
73 (crashbuf (get-buffer-create " *pop3-retr*"))
76 (pop3-password pop3-password)
79 (if pop3-debug (switch-to-buffer (process-buffer process)))
81 (if (and pop3-password-required (not pop3-password))
83 (pop3-read-passwd (format "Password for %s: " pop3-maildrop))))
84 (cond ((equal 'apop pop3-authentication-scheme)
85 (pop3-apop process pop3-maildrop))
86 ((equal 'pass pop3-authentication-scheme)
87 (pop3-user process pop3-maildrop)
89 (t (error "Invalid POP3 authentication scheme.")))
90 (setq message-count (car (pop3-stat process)))
91 (while (<= n message-count)
92 (message (format "Retrieving message %d of %d from %s..."
93 n message-count pop3-mailhost))
94 (pop3-retr process n crashbuf)
97 (let ((coding-system-for-write pop3-movemail-file-coding-system))
98 (append-to-file (point-min) (point-max) crashbox))
99 (set-buffer (process-buffer process))
100 (while (> (buffer-size) 5000)
101 (goto-char (point-min))
103 (delete-region (point-min) (point))))
104 (pop3-dele process n)
106 (if pop3-debug (sit-for 1) (sit-for 0.1))
109 (kill-buffer crashbuf)
113 (defun pop3-open-server (mailhost port)
114 "Open TCP connection to MAILHOST.
115 Returns the process associated with the connection."
116 (let ((process-buffer
117 (get-buffer-create (format "trace of POP session to %s" mailhost)))
119 (coding-system-for-read 'binary) ;; because 0000n0000 S000l 0a0
120 (coding-system-for-write 'binary) ;; is st00pid
123 (set-buffer process-buffer)
125 (setq pop3-read-point (point-min))
128 (open-network-stream "POP" process-buffer mailhost port))
129 (let ((response (pop3-read-response process t)))
131 (substring response (or (string-match "<" response) 0)
132 (+ 1 (or (string-match ">" response) -1)))))
137 (defun pop3-process-filter (process output)
139 (set-buffer (process-buffer process))
140 (goto-char (point-max))
143 (defun pop3-send-command (process command)
144 (set-buffer (process-buffer process))
145 (goto-char (point-max))
146 ;; (if (= (aref command 0) ?P)
147 ;; (insert "PASS <omitted>\r\n")
148 ;; (insert command "\r\n"))
149 (setq pop3-read-point (point))
150 (goto-char (point-max))
151 (process-send-string process command)
152 (process-send-string process "\r\n")
155 (defun pop3-read-response (process &optional return)
156 "Read the response from the server.
157 Return the response string if optional second argument is non-nil."
158 (let ((case-fold-search nil)
161 (set-buffer (process-buffer process))
162 (goto-char pop3-read-point)
163 (while (not (search-forward "\r\n" nil t))
164 (accept-process-output process 3)
165 (goto-char pop3-read-point))
166 (setq match-end (point))
167 (goto-char pop3-read-point)
168 (if (looking-at "-ERR")
169 (error (buffer-substring (point) (- match-end 2)))
170 (if (not (looking-at "+OK"))
171 (progn (setq pop3-read-point match-end) nil)
172 (setq pop3-read-point match-end)
174 (buffer-substring (point) match-end)
178 (defun pop3-string-to-list (string &optional regexp)
179 "Chop up a string into a list."
181 (regexp (or regexp " "))
182 (string (if (string-match "\r" string)
183 (substring string 0 (match-beginning 0))
185 (store-match-data nil)
187 (if (string-match regexp string)
188 (setq list (cons (substring string 0 (- (match-end 0) 1)) list)
189 string (substring string (match-end 0)))
190 (setq list (cons string list)
194 (defvar pop3-read-passwd nil)
195 (defun pop3-read-passwd (prompt)
196 (if (not pop3-read-passwd)
197 (if (functionp 'read-passwd)
198 (setq pop3-read-passwd 'read-passwd)
199 (if (load "passwd" t)
200 (setq pop3-read-passwd 'read-passwd)
201 (autoload 'ange-ftp-read-passwd "ange-ftp")
202 (setq pop3-read-passwd 'ange-ftp-read-passwd))))
203 (funcall pop3-read-passwd prompt))
205 (defun pop3-clean-region (start end)
206 (setq end (set-marker (make-marker) end))
209 (while (and (< (point) end) (search-forward "\r\n" end t))
210 (replace-match "\n" t t))
212 (while (and (< (point) end) (re-search-forward "^\\." end t))
213 (replace-match "" t t)
215 (set-marker end nil))
217 (defun pop3-munge-message-separator (start end)
218 "Check to see if a message separator exists. If not, generate one."
219 (if (not (fboundp 'message-make-date)) (autoload 'message-make-date "message"))
222 (narrow-to-region start end)
223 (goto-char (point-min))
224 (if (not (or (looking-at "From .?") ; Unix mail
225 (looking-at "\001\001\001\001\n") ; MMDF
226 (looking-at "BABYL OPTIONS:") ; Babyl
228 (let ((from (mail-strip-quoted-names (mail-fetch-field "From")))
229 (date (pop3-string-to-list (or (mail-fetch-field "Date")
230 (message-make-date))))
232 ;; sample date formats I have seen
233 ;; Date: Tue, 9 Jul 1996 09:04:21 -0400 (EDT)
234 ;; Date: 08 Jul 1996 23:22:24 -0400
236 ;; Tue Jul 9 09:04:21 1996
238 (cond ((string-match "[A-Z]" (nth 0 date))
239 (format "%s %s %s %s %s"
240 (nth 0 date) (nth 2 date) (nth 1 date)
241 (nth 4 date) (nth 3 date)))
243 ;; this really needs to be better but I don't feel
244 ;; like writing a date to day converter.
245 (format "Sun %s %s %s %s"
246 (nth 1 date) (nth 0 date)
247 (nth 3 date) (nth 2 date)))
249 (setq From_ (format "\nFrom %s %s\n" from date))
250 (while (string-match "," From_)
251 (setq From_ (concat (substring From_ 0 (match-beginning 0))
252 (substring From_ (match-end 0)))))
253 (goto-char (point-min))
258 ;; AUTHORIZATION STATE
260 (defun pop3-user (process user)
261 "Send USER information to POP3 server."
262 (pop3-send-command process (format "USER %s" user))
263 (let ((response (pop3-read-response process t)))
264 (if (not (and response (string-match "+OK" response)))
265 (error (format "USER %s not valid." user)))))
267 (defun pop3-pass (process)
268 "Send authentication information to the server."
269 (pop3-send-command process (format "PASS %s" pop3-password))
270 (let ((response (pop3-read-response process t)))
271 (if (not (and response (string-match "+OK" response)))
272 (pop3-quit process))))
274 (defun pop3-apop (process user)
275 "Send alternate authentication information to the server."
276 (if (not (fboundp 'md5)) (autoload 'md5 "md5"))
277 (let ((hash (md5 (concat pop3-timestamp pop3-password))))
278 (pop3-send-command process (format "APOP %s %s" user hash))
279 (let ((response (pop3-read-response process t)))
280 (if (not (and response (string-match "+OK" response)))
281 (pop3-quit process)))))
285 (defun pop3-stat (process)
286 "Return the number of messages in the maildrop and the maildrop's size."
287 (pop3-send-command process "STAT")
288 (let ((response (pop3-read-response process t)))
289 (list (string-to-int (nth 1 (pop3-string-to-list response)))
290 (string-to-int (nth 2 (pop3-string-to-list response))))
293 (defun pop3-list (process &optional msg)
294 "Scan listing of available messages.
295 This function currently does nothing.")
297 (defun pop3-retr (process msg crashbuf)
298 "Retrieve message-id MSG to buffer CRASHBUF."
299 (pop3-send-command process (format "RETR %s" msg))
300 (pop3-read-response process)
301 (let ((start pop3-read-point) end)
303 (set-buffer (process-buffer process))
304 (while (not (re-search-forward "^\\.\r\n" nil t))
305 (accept-process-output process 3)
306 ;; bill@att.com ... to save wear and tear on the heap
307 ;; uncommented because the condensed version below is a problem for
309 (if (> (buffer-size) 20000) (sleep-for 1))
310 (if (> (buffer-size) 50000) (sleep-for 1))
311 (if (> (buffer-size) 100000) (sleep-for 1))
312 (if (> (buffer-size) 200000) (sleep-for 1))
313 (if (> (buffer-size) 500000) (sleep-for 1))
316 ;; (sometimes causes problems for really large messages.)
317 ; (if (> (buffer-size) 20000) (sleep-for (/ (buffer-size) 20000)))
319 (setq pop3-read-point (point-marker))
320 ;; this code does not seem to work for some POP servers...
321 ;; and I cannot figure out why not.
322 ; (goto-char (match-beginning 0))
324 ; (if (not (looking-at "\r\n"))
326 ; (re-search-forward "\\.\r\n")
327 (goto-char (match-beginning 0))
328 (setq end (point-marker))
329 (pop3-clean-region start end)
330 (pop3-munge-message-separator start end)
332 (set-buffer crashbuf)
334 (copy-to-buffer crashbuf start end)
335 (delete-region start end)
338 (defun pop3-dele (process msg)
339 "Mark message-id MSG as deleted."
340 (pop3-send-command process (format "DELE %s" msg))
341 (pop3-read-response process))
343 (defun pop3-noop (process msg)
345 (pop3-send-command process "NOOP")
346 (pop3-read-response process))
348 (defun pop3-last (process)
349 "Return highest accessed message-id number for the session."
350 (pop3-send-command process "LAST")
351 (let ((response (pop3-read-response process t)))
352 (string-to-int (nth 1 (pop3-string-to-list response)))
355 (defun pop3-rset (process)
356 "Remove all delete marks from current maildrop."
357 (pop3-send-command process "RSET")
358 (pop3-read-response process))
362 (defun pop3-quit (process)
363 "Close connection to POP3 server.
364 Tell server to remove all messages marked as deleted, unlock the maildrop,
365 and close the connection."
366 (pop3-send-command process "QUIT")
367 (pop3-read-response process t)
370 (set-buffer (process-buffer process))
371 (goto-char (point-max))
372 (delete-process process))))
374 ;; Summary of POP3 (Post Office Protocol version 3) commands and responses
376 ;;; AUTHORIZATION STATE
378 ;; Initial TCP connection
380 ;; Restrictions: none
381 ;; Possible responses:
382 ;; +OK [POP3 server ready]
385 ;; Arguments: a server specific user-id (required)
386 ;; Restrictions: authorization state [after unsuccessful USER or PASS
387 ;; Possible responses:
388 ;; +OK [valid user-id]
389 ;; -ERR [invalid user-id]
392 ;; Arguments: a server/user-id specific password (required)
393 ;; Restrictions: authorization state, after successful USER
394 ;; Possible responses:
395 ;; +OK [maildrop locked and ready]
396 ;; -ERR [invalid password]
397 ;; -ERR [unable to lock maildrop]
399 ;;; TRANSACTION STATE
403 ;; Restrictions: transaction state
404 ;; Possible responses:
405 ;; +OK nn mm [# of messages, size of maildrop]
408 ;; Arguments: a message-id (optional)
409 ;; Restrictions: transaction state; msg must not be deleted
410 ;; Possible responses:
411 ;; +OK [scan listing follows]
412 ;; -ERR [no such message]
415 ;; Arguments: a message-id (required)
416 ;; Restrictions: transaction state; msg must not be deleted
417 ;; Possible responses:
418 ;; +OK [message contents follow]
419 ;; -ERR [no such message]
422 ;; Arguments: a message-id (required)
423 ;; Restrictions: transaction state; msg must not be deleted
424 ;; Possible responses:
425 ;; +OK [message deleted]
426 ;; -ERR [no such message]
430 ;; Restrictions: transaction state
431 ;; Possible responses:
436 ;; Restrictions: transaction state
437 ;; Possible responses:
438 ;; +OK nn [highest numbered message accessed]
442 ;; Restrictions: transaction state
443 ;; Possible responses:
444 ;; +OK [all delete marks removed]
450 ;; Restrictions: none
451 ;; Possible responses:
452 ;; +OK [TCP connection closed]