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- ;;; pop3.el --- Post Office Protocol (RFC 1460) interface
-
- ;; Copyright (C) 1996,1997 Free Software Foundation, Inc.
-
- ;; Author: Richard L. Pieri <ratinox@peorth.gweep.net>
- ;; Keywords: mail, pop3
- ;; Version: 1.3g
-
- ;; 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 2, 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; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; Most of the standard Post Office Protocol version 3 (RFC 1460) commands
- ;; are implemented. The LIST command has not been implemented due to lack
- ;; of actual usefulness.
- ;; The optional POP3 command TOP has not been implemented.
-
- ;; This program was inspired by Kyle E. Jones's vm-pop program.
-
- ;;; Code:
-
- (require 'mail-utils)
- (provide 'pop3)
-
- (defconst pop3-version "1.3g")
-
- (defvar pop3-maildrop (or user-login-name (getenv "LOGNAME") (getenv "USER") nil)
- "*POP3 maildrop.")
- (defvar pop3-mailhost (or (getenv "MAILHOST") nil)
- "*POP3 mailhost.")
- (defvar pop3-port 110
- "*POP3 port.")
-
- (defvar pop3-password-required t
- "*Non-nil if a password is required when connecting to POP server.")
- (defvar pop3-password nil
- "*Password to use when connecting to POP server.")
-
- (defvar pop3-authentication-scheme 'pass
- "*POP3 authentication scheme.
- Defaults to 'pass, for the standard USER/PASS authentication. Other valid
- values are 'apop.")
-
- (defvar pop3-timestamp nil
- "Timestamp returned when initially connected to the POP server.
- Used for APOP authentication.")
-
- (defvar pop3-movemail-file-coding-system nil
- "Crashbox made by pop3-movemail with this coding system.")
-
- (defvar pop3-read-point nil)
- (defvar pop3-debug nil)
-
- (defun pop3-movemail (&optional crashbox)
- "Transfer contents of a maildrop to the specified CRASHBOX."
- (or crashbox (setq crashbox (expand-file-name "~/.crashbox")))
- (let* ((process (pop3-open-server pop3-mailhost pop3-port))
- (crashbuf (get-buffer-create " *pop3-retr*"))
- (n 1)
- message-count)
- ;; for debugging only
- (if pop3-debug (switch-to-buffer (process-buffer process)))
- (cond ((equal 'apop pop3-authentication-scheme)
- (pop3-apop process pop3-maildrop))
- ((equal 'pass pop3-authentication-scheme)
- (pop3-user process pop3-maildrop)
- (pop3-pass process))
- (t (error "Invalid POP3 authentication scheme.")))
- (setq message-count (car (pop3-stat process)))
- (while (<= n message-count)
- (message (format "Retrieving message %d of %d from %s..."
- n message-count pop3-mailhost))
- (pop3-retr process n crashbuf)
- (save-excursion
- (set-buffer crashbuf)
- (let ((coding-system-for-write pop3-movemail-file-coding-system))
- (append-to-file (point-min) (point-max) crashbox))
- (set-buffer (process-buffer process))
- (while (> (buffer-size) 5000)
- (goto-char (point-min))
- (forward-line 50)
- (delete-region (point-min) (point))))
- (pop3-dele process n)
- (setq n (+ 1 n))
- (if pop3-debug (sit-for 1) (sit-for 0.1))
- )
- (pop3-quit process)
- (kill-buffer crashbuf)
- )
- )
-
- (defun pop3-open-server (mailhost port)
- "Open TCP connection to MAILHOST.
- Returns the process associated with the connection."
- (let ((process-buffer
- (get-buffer-create (format "trace of POP session to %s" mailhost)))
- (process))
- (save-excursion
- (set-buffer process-buffer)
- (erase-buffer))
- (setq process
- (open-network-stream "POP" process-buffer mailhost port))
- (setq pop3-read-point (point-min))
- (let ((response (pop3-read-response process t)))
- (setq pop3-timestamp
- (substring response (or (string-match "<" response) 0)
- (+ 1 (or (string-match ">" response) -1)))))
- process
- ))
-
- ;; Support functions
-
- (defun pop3-process-filter (process output)
- (save-excursion
- (set-buffer (process-buffer process))
- (goto-char (point-max))
- (insert output)))
-
- (defun pop3-send-command (process command)
- (set-buffer (process-buffer process))
- (goto-char (point-max))
- ;; (if (= (aref command 0) ?P)
- ;; (insert "PASS <omitted>\r\n")
- ;; (insert command "\r\n"))
- (setq pop3-read-point (point))
- (goto-char (point-max))
- (process-send-string process command)
- (process-send-string process "\r\n")
- )
-
- (defun pop3-read-response (process &optional return)
- "Read the response from the server.
- Return the response string if optional second argument is non-nil."
- (let ((case-fold-search nil)
- match-end)
- (save-excursion
- (set-buffer (process-buffer process))
- (goto-char pop3-read-point)
- (while (not (search-forward "\r\n" nil t))
- (accept-process-output process 3)
- (goto-char pop3-read-point))
- (setq match-end (point))
- (goto-char pop3-read-point)
- (if (looking-at "-ERR")
- (error (buffer-substring (point) (- match-end 2)))
- (if (not (looking-at "+OK"))
- (progn (setq pop3-read-point match-end) nil)
- (setq pop3-read-point match-end)
- (if return
- (buffer-substring (point) match-end)
- t)
- )))))
-
- (defun pop3-string-to-list (string &optional regexp)
- "Chop up a string into a list."
- (let ((list)
- (regexp (or regexp " "))
- (string (if (string-match "\r" string)
- (substring string 0 (match-beginning 0))
- string)))
- (store-match-data nil)
- (while string
- (if (string-match regexp string)
- (setq list (cons (substring string 0 (- (match-end 0) 1)) list)
- string (substring string (match-end 0)))
- (setq list (cons string list)
- string nil)))
- (nreverse list)))
-
- (defvar pop3-read-passwd nil)
- (defun pop3-read-passwd (prompt)
- (if (not pop3-read-passwd)
- (if (load "passwd" t)
- (setq pop3-read-passwd 'read-passwd)
- (autoload 'ange-ftp-read-passwd "ange-ftp")
- (setq pop3-read-passwd 'ange-ftp-read-passwd)))
- (funcall pop3-read-passwd prompt))
-
- (defun pop3-clean-region (start end)
- (setq end (set-marker (make-marker) end))
- (save-excursion
- (goto-char start)
- (while (and (< (point) end) (search-forward "\r\n" end t))
- (replace-match "\n" t t))
- (goto-char start)
- (while (and (< (point) end) (re-search-forward "^\\." end t))
- (replace-match "" t t)
- (forward-char)))
- (set-marker end nil))
-
- (defun pop3-munge-message-separator (start end)
- "Check to see if a message separator exists. If not, generate one."
- (if (not (fboundp 'message-make-date)) (autoload 'message-make-date "message"))
- (save-excursion
- (save-restriction
- (narrow-to-region start end)
- (goto-char (point-min))
- (if (not (or (looking-at "From .?") ; Unix mail
- (looking-at "\001\001\001\001\n") ; MMDF
- (looking-at "BABYL OPTIONS:") ; Babyl
- ))
- (let ((from (mail-strip-quoted-names (mail-fetch-field "From")))
- (date (pop3-string-to-list (or (mail-fetch-field "Date")
- (message-make-date))))
- (From_))
- ;; sample date formats I have seen
- ;; Date: Tue, 9 Jul 1996 09:04:21 -0400 (EDT)
- ;; Date: 08 Jul 1996 23:22:24 -0400
- ;; should be
- ;; Tue Jul 9 09:04:21 1996
- (setq date
- (cond ((string-match "[A-Z]" (nth 0 date))
- (format "%s %s %s %s %s"
- (nth 0 date) (nth 2 date) (nth 1 date)
- (nth 4 date) (nth 3 date)))
- (t
- ;; this really needs to be better but I don't feel
- ;; like writing a date to day converter.
- (format "Sun %s %s %s %s"
- (nth 1 date) (nth 0 date)
- (nth 3 date) (nth 2 date)))
- ))
- (setq From_ (format "\nFrom %s %s\n" from date))
- (while (string-match "," From_)
- (setq From_ (concat (substring From_ 0 (match-beginning 0))
- (substring From_ (match-end 0)))))
- (goto-char (point-min))
- (insert From_))))))
-
- ;; The Command Set
-
- ;; AUTHORIZATION STATE
-
- (defun pop3-user (process user)
- "Send USER information to POP3 server."
- (pop3-send-command process (format "USER %s" user))
- (let ((response (pop3-read-response process t)))
- (if (not (and response (string-match "+OK" response)))
- (error (format "USER %s not valid." user)))))
-
- (defun pop3-pass (process)
- "Send authentication information to the server."
- (let ((pass pop3-password))
- (if (and pop3-password-required (not pass))
- (setq pass
- (pop3-read-passwd (format "Password for %s: " pop3-maildrop))))
- (if pass
- (progn
- (pop3-send-command process (format "PASS %s" pass))
- (let ((response (pop3-read-response process t)))
- (if (not (and response (string-match "+OK" response)))
- (pop3-quit process)))))
- ))
-
- (defvar pop3-md5-program "md5"
- "*Program to encode its input in MD5.")
-
- (defun pop3-md5 (string)
- (with-temp-buffer
- (insert string)
- (call-process-region (point-min) (point-max)
- (or shell-file-name "/bin/sh")
- t (current-buffer) nil
- "-c" pop3-md5-program)
- ;; The meaningful output is the first 32 characters.
- ;; Don't return the newline that follows them!
- (buffer-substring (point-min) (+ (point-min) 32))))
-
- (defun pop3-apop (process user)
- "Send alternate authentication information to the server."
- (let ((pass pop3-password))
- (if (and pop3-password-required (not pass))
- (setq pass
- (pop3-read-passwd (format "Password for %s: " pop3-maildrop))))
- (if pass
- (let ((hash (pop3-md5 (concat pop3-timestamp pass))))
- (pop3-send-command process (format "APOP %s %s" user hash))
- (let ((response (pop3-read-response process t)))
- (if (not (and response (string-match "+OK" response)))
- (pop3-quit process)))))
- ))
-
- ;; TRANSACTION STATE
-
- (defun pop3-stat (process)
- "Return the number of messages in the maildrop and the maildrop's size."
- (pop3-send-command process "STAT")
- (let ((response (pop3-read-response process t)))
- (list (string-to-int (nth 1 (pop3-string-to-list response)))
- (string-to-int (nth 2 (pop3-string-to-list response))))
- ))
-
- (defun pop3-list (process &optional msg)
- "Scan listing of available messages.
- This function currently does nothing.")
-
- (defun pop3-retr (process msg crashbuf)
- "Retrieve message-id MSG to buffer CRASHBUF."
- (pop3-send-command process (format "RETR %s" msg))
- (pop3-read-response process)
- (let ((start pop3-read-point) end)
- (save-excursion
- (set-buffer (process-buffer process))
- (while (not (re-search-forward "^\\.\r\n" nil t))
- (accept-process-output process 3)
- ;; bill@att.com ... to save wear and tear on the heap
- (if (> (buffer-size) 20000) (sleep-for 1))
- (if (> (buffer-size) 50000) (sleep-for 1))
- (if (> (buffer-size) 100000) (sleep-for 1))
- (if (> (buffer-size) 200000) (sleep-for 1))
- (if (> (buffer-size) 500000) (sleep-for 1))
- ;; bill@att.com
- (goto-char start))
- (setq pop3-read-point (point-marker))
- ;; this code does not seem to work for some POP servers...
- ;; and I cannot figure out why not.
- ; (goto-char (match-beginning 0))
- ; (backward-char 2)
- ; (if (not (looking-at "\r\n"))
- ; (insert "\r\n"))
- ; (re-search-forward "\\.\r\n")
- (goto-char (match-beginning 0))
- (setq end (point-marker))
- (pop3-clean-region start end)
- (pop3-munge-message-separator start end)
- (save-excursion
- (set-buffer crashbuf)
- (erase-buffer))
- (copy-to-buffer crashbuf start end)
- (delete-region start end)
- )))
-
- (defun pop3-dele (process msg)
- "Mark message-id MSG as deleted."
- (pop3-send-command process (format "DELE %s" msg))
- (pop3-read-response process))
-
- (defun pop3-noop (process msg)
- "No-operation."
- (pop3-send-command process "NOOP")
- (pop3-read-response process))
-
- (defun pop3-last (process)
- "Return highest accessed message-id number for the session."
- (pop3-send-command process "LAST")
- (let ((response (pop3-read-response process t)))
- (string-to-int (nth 1 (pop3-string-to-list response)))
- ))
-
- (defun pop3-rset (process)
- "Remove all delete marks from current maildrop."
- (pop3-send-command process "RSET")
- (pop3-read-response process))
-
- ;; UPDATE
-
- (defun pop3-quit (process)
- "Close connection to POP3 server.
- Tell server to remove all messages marked as deleted, unlock the maildrop,
- and close the connection."
- (pop3-send-command process "QUIT")
- (pop3-read-response process t)
- (if process
- (save-excursion
- (set-buffer (process-buffer process))
- (goto-char (point-max))
- (delete-process process))))
-
- ;; Summary of POP3 (Post Office Protocol version 3) commands and responses
-
- ;;; AUTHORIZATION STATE
-
- ;; Initial TCP connection
- ;; Arguments: none
- ;; Restrictions: none
- ;; Possible responses:
- ;; +OK [POP3 server ready]
-
- ;; USER name
- ;; Arguments: a server specific user-id (required)
- ;; Restrictions: authorization state [after unsuccessful USER or PASS
- ;; Possible responses:
- ;; +OK [valid user-id]
- ;; -ERR [invalid user-id]
-
- ;; PASS string
- ;; Arguments: a server/user-id specific password (required)
- ;; Restrictions: authorization state, after successful USER
- ;; Possible responses:
- ;; +OK [maildrop locked and ready]
- ;; -ERR [invalid password]
- ;; -ERR [unable to lock maildrop]
-
- ;;; TRANSACTION STATE
-
- ;; STAT
- ;; Arguments: none
- ;; Restrictions: transaction state
- ;; Possible responses:
- ;; +OK nn mm [# of messages, size of maildrop]
-
- ;; LIST [msg]
- ;; Arguments: a message-id (optional)
- ;; Restrictions: transaction state; msg must not be deleted
- ;; Possible responses:
- ;; +OK [scan listing follows]
- ;; -ERR [no such message]
-
- ;; RETR msg
- ;; Arguments: a message-id (required)
- ;; Restrictions: transaction state; msg must not be deleted
- ;; Possible responses:
- ;; +OK [message contents follow]
- ;; -ERR [no such message]
-
- ;; DELE msg
- ;; Arguments: a message-id (required)
- ;; Restrictions: transaction state; msg must not be deleted
- ;; Possible responses:
- ;; +OK [message deleted]
- ;; -ERR [no such message]
-
- ;; NOOP
- ;; Arguments: none
- ;; Restrictions: transaction state
- ;; Possible responses:
- ;; +OK
-
- ;; LAST
- ;; Arguments: none
- ;; Restrictions: transaction state
- ;; Possible responses:
- ;; +OK nn [highest numbered message accessed]
-
- ;; RSET
- ;; Arguments: none
- ;; Restrictions: transaction state
- ;; Possible responses:
- ;; +OK [all delete marks removed]
-
- ;;; UPDATE STATE
-
- ;; QUIT
- ;; Arguments: none
- ;; Restrictions: none
- ;; Possible responses:
- ;; +OK [TCP connection closed]
-