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;;; mew-ssh.el
;; Author: Kazu Yamamoto <Kazu@Mew.org>
;; Created: Dec 14, 1999
;;; Code:
(require 'mew)
(defvar mew-ssh-prog-ver nil) ;; 0-SSH1, 1-SSH2, 2-OpenSSH, 3-PuTTY
(defun mew-ssh-get (case list-or-vec)
(elt list-or-vec (mew-ssh-prog-ver case)))
(defconst mew-ssh-msg-passwd
'("password:\\|Enter passphrase"
"password:\\|Passphrase for\\|Enter passphrase"
"password:\\|Enter passphrase"
"Password:\\|Passphrase for key"))
(defconst mew-ssh-msg-connected
'("Entering interactive session"
"Authentication successful\\|client_authenticated"
"Entering interactive session"
"Access granted"))
(defconst mew-ssh-msg-denied
'("Permission denied\\." "Permission denied\\." "Permission denied\\."
"Permission denied\\.")) ;XXX
(defconst mew-ssh-msg-refused
'("Secure connection .* refused\\."
"FATAL: Connecting .* failed:"
"Secure connection .* refused\\."
"Secure connection .* refused\\.")) ;XXX
(defconst mew-ssh-process-exec-cnt 3)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; SSH info
;;;
(defvar mew-ssh-info-list '("case" "status" "try" "account"))
(mew-info-defun "mew-ssh-" mew-ssh-info-list)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Process name
;;;
(defconst mew-ssh-info-prefix "mew-ssh-info-")
(defun mew-ssh-info-name (sshserver server remoteport localport)
(format "%s:%s:%s:%d:%d"
mew-ssh-info-prefix sshserver server remoteport localport))
(defun mew-ssh-info-name-regex (sshserver server remoteport)
(format "^%s:%s:%s:%d" mew-ssh-info-prefix sshserver server remoteport))
(defun mew-ssh-pnm-to-lport (pnm)
(if (string-match ":\\([0-9]+\\)$" pnm) (match-string 1 pnm)))
;; user@host:port should be used here.
;; However, SSH does not symbolic port name "ssh" for the "-p" option
;; while OpenSSH does. Sigh...
(defun mew-ssh-passtag (name)
(if (string-match (format "^%s:[^:]+:" mew-ssh-info-prefix) name)
(match-string 0 name)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Executing SSH
;;;
(defun mew-open-ssh-stream (case server serv sshserver)
"Open SSH stream for SERVER's SERV via SSHSERVER.
This function returns a process when an SSH connection is created
successfully. A local port number can be obtained the process name
after ':'."
(let* ((ssh (mew-ssh-prog case))
(args (mew-ssh-prog-args case))
(remoteport (mew-serv-to-port serv))
(localport (+ 8000 (% (mew-random) 4000)))
(process-connection-type mew-connection-type2)
(N mew-ssh-process-exec-cnt)
(pros (process-list))
(regex (mew-ssh-info-name-regex sshserver server remoteport))
name pnm pro status)
(cond
((not (mew-which-exec ssh))
(message "'%s' is not found" ssh))
(t
(catch 'find
(dolist (pr pros)
(when (string-match regex (process-name pr))
(if (memq (process-status pr) '(run))
(setq pro pr)
(delete-process pr))
(throw 'find nil))))
(if pro
pro
(message "Connecting to the SSH server...")
(setq pro nil)
(catch 'loop
(dotimes (i N)
(setq name (mew-ssh-info-name sshserver server remoteport localport))
(setq pro (apply 'start-process
name nil
ssh "-x" "-v" "-L"
(format "%d:%s:%d" localport server remoteport)
(append args (list sshserver))))
;; An error would occur. So, let's exit in the case.
(mew-timing)
(cond
((not (processp pro))
(message "Connecting to the SSH server...FAILED")
(throw 'loop nil))
((not (memq (process-status pro) '(run)))
(delete-process pro)
(message "Connecting to the SSH server...FAILED")
(throw 'loop nil)))
;; ssh is now running.
(mew-process-silent-exit pro)
(setq pnm (process-name pro))
(mew-info-clean-up pnm)
(mew-ssh-set-try pnm 0)
(mew-ssh-set-case pnm case)
(mew-ssh-set-account pnm (format "%s" sshserver))
(mew-set-process-cs pro mew-cs-text-for-read mew-cs-text-for-write)
(set-process-filter pro 'mew-ssh-filter)
(set-process-sentinel pro 'mew-ssh-sentinel)
(mew-rendezvous (null (mew-ssh-get-status pnm)))
(setq status (mew-ssh-get-status pnm))
(cond
((eq status t)
(throw 'loop pro)) ;; return value
((not (eq status 'bound))
(message "Connecting to the SSH server...FAILED")
(throw 'loop nil))) ;; return value
;; 'bound
(setq localport (1+ localport))
(message "Connecting to the SSH server...FAILED")
nil))))))) ;; return value
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Filter and sentinel
;;;
(defun mew-ssh-debug (label string)
(when (mew-debug 'net)
(with-current-buffer (get-buffer-create mew-buffer-debug)
(goto-char (point-max))
(insert (format "\n<%s>\n%s\n" label string)))))
(defun mew-ssh-filter (process string)
(save-excursion
(mew-ssh-debug "SSH: " string)
(let* ((pnm (process-name process))
(case (mew-ssh-get-case pnm))
pass)
(cond
((string-match (mew-ssh-get case mew-ssh-msg-passwd) string)
(if (= (mew-ssh-get-try pnm) 0)
(setq pass (mew-input-passwd (format "SSH password (%s): "
(mew-ssh-get-account pnm))
(mew-ssh-passtag pnm)))
(mew-passwd-set-passwd (mew-ssh-passtag pnm) nil)
(setq pass (mew-input-passwd (format "SSH password again (%s): "
(mew-ssh-get-account pnm))
(mew-ssh-passtag pnm))))
(mew-ssh-set-try pnm (1+ (mew-ssh-get-try pnm)))
(if (and (processp process)
(memq (process-status process) '(run)))
(progn
(message "Sending password to the SSH server...")
(process-send-string process (concat pass "\n")))
(mew-passwd-set-passwd (mew-ssh-passtag pnm) nil)
(message "Cannot find SSH process")))
((or (string-match (mew-ssh-get case mew-ssh-msg-denied) string)
(string-match (mew-ssh-get case mew-ssh-msg-refused) string))
(message "Cannot connect to the SSH server")
(mew-passwd-set-passwd (mew-ssh-passtag pnm) nil)
(mew-ssh-set-status pnm 'denied))
((string-match (mew-ssh-get case mew-ssh-msg-connected) string)
(mew-ssh-set-status pnm t)
(message "Connecting to the SSH server...done"))
((string-match "Local: bind: Address already in use" string)
(mew-ssh-set-status pnm 'bound)
(message "Connecting to the SSH server...done"))))))
(defun mew-ssh-sentinel (process event)
(let ((pnm (process-name process)))
(save-excursion
(unless (mew-ssh-get-status pnm)
(mew-ssh-set-status pnm 'exit)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; SSH version check
;;;
(defun mew-ssh-setup ()
(let ((ssh (mew-ssh-prog)))
(if (not (mew-which-exec ssh))
(setq mew-ssh-prog-ver nil)
(with-temp-buffer
(call-process ssh nil t nil "-V")
(goto-char (point-min))
(cond
((looking-at "SSH Version 1")
(setq mew-ssh-prog-ver 0))
((looking-at (concat ssh ": SSH Version 2"))
(setq mew-ssh-prog-ver 1))
((looking-at (concat ssh ": SSH Secure Shell [23]"))
(setq mew-ssh-prog-ver 1))
((looking-at "\\(SSH Version \\)?\\(OpenSSH\\|NetBSD\\|Sun_SSH\\)")
(setq mew-ssh-prog-ver 2))
((looking-at "plink:")
(setq mew-ssh-prog-ver 3))
(t
(setq mew-ssh-prog-ver nil)))))))
(provide 'mew-ssh)
;;; Copyright Notice:
;; Copyright (C) 1999-2010 Mew developing team.
;; All rights reserved.
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions
;; are met:
;;
;; 1. Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;; 2. Redistributions in binary form must reproduce the above copyright
;; notice, this list of conditions and the following disclaimer in the
;; documentation and/or other materials provided with the distribution.
;; 3. Neither the name of the team nor the names of its contributors
;; may be used to endorse or promote products derived from this software
;; without specific prior written permission.
;;
;; THIS SOFTWARE IS PROVIDED BY THE TEAM AND CONTRIBUTORS ``AS IS'' AND
;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
;; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE TEAM OR CONTRIBUTORS BE
;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
;; BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
;; OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
;; IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;; mew-ssh.el ends here
|