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278 lines
9.1 KiB
EmacsLisp
278 lines
9.1 KiB
EmacsLisp
;;; url-gw.el --- Gateway munging for URL loading
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;; Copyright (C) 1997, 1998, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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;; Free Software Foundation, Inc.
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;; Author: Bill Perry <wmperry@gnu.org>
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;; Keywords: comm, data, processes
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Code:
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(eval-when-compile (require 'cl))
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(require 'url-vars)
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;; Fixme: support SSH explicitly or via a url-gateway-rlogin-program?
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(autoload 'socks-open-network-stream "socks")
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(autoload 'open-ssl-stream "ssl")
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(autoload 'open-tls-stream "tls")
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(defgroup url-gateway nil
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"URL gateway variables."
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:group 'url)
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(defcustom url-gateway-local-host-regexp nil
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"*A regular expression specifying local hostnames/machines."
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:type '(choice (const nil) regexp)
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:group 'url-gateway)
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(defcustom url-gateway-prompt-pattern
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"^[^#$%>;]*[#$%>;] *" ;; "bash\\|\$ *\r?$\\|> *\r?"
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"*A regular expression matching a shell prompt."
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:type 'regexp
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:group 'url-gateway)
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(defcustom url-gateway-rlogin-host nil
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"*What hostname to actually rlog into before doing a telnet."
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:type '(choice (const nil) string)
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:group 'url-gateway)
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(defcustom url-gateway-rlogin-user-name nil
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"*Username to log into the remote machine with when using rlogin."
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:type '(choice (const nil) string)
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:group 'url-gateway)
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(defcustom url-gateway-rlogin-parameters '("telnet" "-8")
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"*Parameters to `url-open-rlogin'.
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This list will be used as the parameter list given to rsh."
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:type '(repeat string)
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:group 'url-gateway)
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(defcustom url-gateway-telnet-host nil
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"*What hostname to actually login to before doing a telnet."
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:type '(choice (const nil) string)
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:group 'url-gateway)
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(defcustom url-gateway-telnet-parameters '("exec" "telnet" "-8")
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"*Parameters to `url-open-telnet'.
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This list will be executed as a command after logging in via telnet."
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:type '(repeat string)
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:group 'url-gateway)
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(defcustom url-gateway-telnet-login-prompt "^\r*.?login:"
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"*Prompt that tells us we should send our username when loggin in w/telnet."
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:type 'regexp
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:group 'url-gateway)
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(defcustom url-gateway-telnet-password-prompt "^\r*.?password:"
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"*Prompt that tells us we should send our password when loggin in w/telnet."
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:type 'regexp
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:group 'url-gateway)
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(defcustom url-gateway-telnet-user-name nil
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"User name to log in via telnet with."
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:type '(choice (const nil) string)
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:group 'url-gateway)
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(defcustom url-gateway-telnet-password nil
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"Password to use to log in via telnet with."
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:type '(choice (const nil) string)
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:group 'url-gateway)
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(defcustom url-gateway-broken-resolution nil
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"*Whether to use nslookup to resolve hostnames.
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This should be used when your version of Emacs cannot correctly use DNS,
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but your machine can. This usually happens if you are running a statically
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linked Emacs under SunOS 4.x."
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:type 'boolean
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:group 'url-gateway)
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(defcustom url-gateway-nslookup-program "nslookup"
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"*If non-nil then a string naming nslookup program."
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:type '(choice (const :tag "None" :value nil) string)
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:group 'url-gateway)
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;; Stolen from ange-ftp
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;;;###autoload
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(defun url-gateway-nslookup-host (host)
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"Attempt to resolve the given HOST using nslookup if possible."
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(interactive "sHost: ")
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(if url-gateway-nslookup-program
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(let ((proc (start-process " *nslookup*" " *nslookup*"
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url-gateway-nslookup-program host))
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(res host))
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(set-process-query-on-exit-flag proc nil)
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(with-current-buffer (process-buffer proc)
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(while (memq (process-status proc) '(run open))
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(accept-process-output proc))
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(goto-char (point-min))
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(if (re-search-forward "Name:.*\nAddress: *\\(.*\\)$" nil t)
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(setq res (buffer-substring (match-beginning 1)
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(match-end 1))))
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(kill-buffer (current-buffer)))
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res)
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host))
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;; Stolen from red gnus nntp.el
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(defun url-wait-for-string (regexp proc)
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"Wait until string matching REGEXP arrives in process PROC's buffer."
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(let ((buf (current-buffer)))
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(goto-char (point-min))
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(while (not (re-search-forward regexp nil t))
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(accept-process-output proc)
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(set-buffer buf)
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(goto-char (point-min)))))
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;; Stolen from red gnus nntp.el
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(defun url-open-rlogin (name buffer host service)
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"Open a connection using rsh."
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(if (not (stringp service))
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(setq service (int-to-string service)))
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(let ((proc (if url-gateway-rlogin-user-name
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(start-process
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name buffer "rsh"
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url-gateway-rlogin-host "-l" url-gateway-rlogin-user-name
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(mapconcat 'identity
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(append url-gateway-rlogin-parameters
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(list host service)) " "))
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(start-process
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name buffer "rsh" url-gateway-rlogin-host
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(mapconcat 'identity
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(append url-gateway-rlogin-parameters
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(list host service))
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" ")))))
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(set-buffer buffer)
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(url-wait-for-string "^\r*200" proc)
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(beginning-of-line)
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(delete-region (point-min) (point))
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proc))
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;; Stolen from red gnus nntp.el
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(defun url-open-telnet (name buffer host service)
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(if (not (stringp service))
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(setq service (int-to-string service)))
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(with-current-buffer (get-buffer-create buffer)
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(erase-buffer)
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(let ((proc (start-process name buffer "telnet" "-8"))
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(case-fold-search t))
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(when (memq (process-status proc) '(open run))
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(process-send-string proc "set escape \^X\n")
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(process-send-string proc (concat
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"open " url-gateway-telnet-host "\n"))
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(url-wait-for-string url-gateway-telnet-login-prompt proc)
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(process-send-string
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proc (concat
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(or url-gateway-telnet-user-name
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(setq url-gateway-telnet-user-name (read-string "login: ")))
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"\n"))
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(url-wait-for-string url-gateway-telnet-password-prompt proc)
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(process-send-string
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proc (concat
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(or url-gateway-telnet-password
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(setq url-gateway-telnet-password
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(read-passwd "Password: ")))
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"\n"))
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(erase-buffer)
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(url-wait-for-string url-gateway-prompt-pattern proc)
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(process-send-string
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proc (concat (mapconcat 'identity
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(append url-gateway-telnet-parameters
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(list host service)) " ") "\n"))
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(url-wait-for-string "^\r*Escape character.*\r*\n+" proc)
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(delete-region (point-min) (match-end 0))
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(process-send-string proc "\^]\n")
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(url-wait-for-string "^telnet" proc)
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(process-send-string proc "mode character\n")
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(accept-process-output proc 1)
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(sit-for 1)
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(goto-char (point-min))
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(forward-line 1)
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(delete-region (point) (point-max)))
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proc)))
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;;;###autoload
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(defun url-open-stream (name buffer host service)
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"Open a stream to HOST, possibly via a gateway.
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Args per `open-network-stream'.
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Will not make a connection if `url-gateway-unplugged' is non-nil.
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Might do a non-blocking connection; use `process-status' to check."
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(unless url-gateway-unplugged
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(let ((gw-method (if (and url-gateway-local-host-regexp
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(not (eq 'tls url-gateway-method))
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(not (eq 'ssl url-gateway-method))
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(string-match
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url-gateway-local-host-regexp
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host))
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'native
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url-gateway-method))
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;;; ;; This hack is for OS/2 Emacs so that it will not do bogus CRLF
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;;; ;; conversions while trying to be 'helpful'
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;;; (tcp-binary-process-output-services (if (stringp service)
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;;; (list service)
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;;; (list service
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;;; (int-to-string service))))
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;; An attempt to deal with denied connections, and attempt
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;; to reconnect
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(cur-retries 0)
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(retry t)
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(errobj nil)
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(conn nil))
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;; If the user told us to do DNS for them, do it.
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(if url-gateway-broken-resolution
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(setq host (url-gateway-nslookup-host host)))
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(condition-case errobj
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;; This is a clean way to ensure the new process inherits the
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;; right coding systems in both Emacs and XEmacs.
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(let ((coding-system-for-read 'binary)
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(coding-system-for-write 'binary))
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(setq conn (case gw-method
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(tls
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(open-tls-stream name buffer host service))
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(ssl
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(open-ssl-stream name buffer host service))
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((native)
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;; Use non-blocking socket if we can.
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(make-network-process :name name :buffer buffer
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:host host :service service
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:nowait
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(featurep 'make-network-process '(:nowait t))))
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(socks
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(socks-open-network-stream name buffer host service))
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(telnet
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(url-open-telnet name buffer host service))
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(rlogin
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(url-open-rlogin name buffer host service))
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(otherwise
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(error "Bad setting of url-gateway-method: %s"
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url-gateway-method)))))
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;; Ignoring errors here seems wrong. E.g. it'll throw away the
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;; error signaled two lines above. It was also found inconvenient
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;; during debugging.
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;; (error
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;; (setq conn nil))
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)
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conn)))
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(provide 'url-gw)
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;; arch-tag: 1c4c0317-6d03-45b8-b3f3-838bd8f9d838
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;;; url-gw.el ends here
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