summaryrefslogtreecommitdiff
path: root/lisp/url/url-gw.el
blob: 169ccf57be077f48cadafd22b1620a5088081005 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
;;; url-gw.el --- Gateway munging for URL loading

;; Copyright (C) 1997, 1998, 2004, 2005, 2006, 2007, 2008, 2009
;;   Free Software Foundation, Inc.

;; Author: Bill Perry <wmperry@gnu.org>
;; Keywords: comm, data, processes

;; 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 <http://www.gnu.org/licenses/>.

;;; Code:

(eval-when-compile (require 'cl))
(require 'url-vars)

;; Fixme: support SSH explicitly or via a url-gateway-rlogin-program?

(autoload 'socks-open-network-stream "socks")
(autoload 'open-ssl-stream "ssl")
(autoload 'open-tls-stream "tls")

(defgroup url-gateway nil
  "URL gateway variables."
  :group 'url)

(defcustom url-gateway-local-host-regexp nil
  "*A regular expression specifying local hostnames/machines."
  :type '(choice (const nil) regexp)
  :group 'url-gateway)

(defcustom url-gateway-prompt-pattern
  "^[^#$%>;]*[#$%>;] *" ;; "bash\\|\$ *\r?$\\|> *\r?"
  "*A regular expression matching a shell prompt."
  :type 'regexp
  :group 'url-gateway)

(defcustom url-gateway-rlogin-host nil
  "*What hostname to actually rlog into before doing a telnet."
  :type '(choice (const nil) string)
  :group 'url-gateway)

(defcustom url-gateway-rlogin-user-name nil
  "*Username to log into the remote machine with when using rlogin."
  :type '(choice (const nil) string)
  :group 'url-gateway)

(defcustom url-gateway-rlogin-parameters '("telnet" "-8")
  "*Parameters to `url-open-rlogin'.
This list will be used as the parameter list given to rsh."
  :type '(repeat string)
  :group 'url-gateway)

(defcustom url-gateway-telnet-host nil
  "*What hostname to actually login to before doing a telnet."
  :type '(choice (const nil) string)
  :group 'url-gateway)

(defcustom url-gateway-telnet-parameters '("exec" "telnet" "-8")
  "*Parameters to `url-open-telnet'.
This list will be executed as a command after logging in via telnet."
  :type '(repeat string)
  :group 'url-gateway)

(defcustom url-gateway-telnet-login-prompt "^\r*.?login:"
  "*Prompt that tells us we should send our username when loggin in w/telnet."
  :type 'regexp
  :group 'url-gateway)

(defcustom url-gateway-telnet-password-prompt "^\r*.?password:"
  "*Prompt that tells us we should send our password when loggin in w/telnet."
  :type 'regexp
  :group 'url-gateway)

(defcustom url-gateway-telnet-user-name nil
  "User name to log in via telnet with."
  :type '(choice (const nil) string)
  :group 'url-gateway)

(defcustom url-gateway-telnet-password nil
  "Password to use to log in via telnet with."
  :type '(choice (const nil) string)
  :group 'url-gateway)

(defcustom url-gateway-broken-resolution nil
  "*Whether to use nslookup to resolve hostnames.
This should be used when your version of Emacs cannot correctly use DNS,
but your machine can.  This usually happens if you are running a statically
linked Emacs under SunOS 4.x."
  :type 'boolean
  :group 'url-gateway)

(defcustom url-gateway-nslookup-program "nslookup"
  "*If non-nil then a string naming nslookup program."
  :type '(choice (const :tag "None" :value nil) string)
  :group 'url-gateway)

;; Stolen from ange-ftp
;;;###autoload
(defun url-gateway-nslookup-host (host)
  "Attempt to resolve the given HOST using nslookup if possible."
  (interactive "sHost:  ")
  (if url-gateway-nslookup-program
      (let ((proc (start-process " *nslookup*" " *nslookup*"
				 url-gateway-nslookup-program host))
	    (res host))
	(set-process-query-on-exit-flag proc nil)
	(with-current-buffer (process-buffer proc)
	  (while (memq (process-status proc) '(run open))
	    (accept-process-output proc))
	  (goto-char (point-min))
	  (if (re-search-forward "Name:.*\nAddress: *\\(.*\\)$" nil t)
	      (setq res (buffer-substring (match-beginning 1)
					  (match-end 1))))
	  (kill-buffer (current-buffer)))
	res)
    host))

;; Stolen from red gnus nntp.el
(defun url-wait-for-string (regexp proc)
  "Wait until string matching REGEXP arrives in process PROC's buffer."
  (let ((buf (current-buffer)))
    (goto-char (point-min))
    (while (not (re-search-forward regexp nil t))
      (accept-process-output proc)
      (set-buffer buf)
      (goto-char (point-min)))))

;; Stolen from red gnus nntp.el
(defun url-open-rlogin (name buffer host service)
  "Open a connection using rsh."
  (if (not (stringp service))
      (setq service (int-to-string service)))
  (let ((proc (if url-gateway-rlogin-user-name
		  (start-process
		   name buffer "rsh"
		   url-gateway-rlogin-host "-l" url-gateway-rlogin-user-name
		   (mapconcat 'identity
			      (append url-gateway-rlogin-parameters
				      (list host service)) " "))
		(start-process
		 name buffer "rsh" url-gateway-rlogin-host
		 (mapconcat 'identity
			    (append url-gateway-rlogin-parameters
				    (list host service))
			    " ")))))
    (set-buffer buffer)
    (url-wait-for-string "^\r*200" proc)
    (beginning-of-line)
    (delete-region (point-min) (point))
    proc))

;; Stolen from red gnus nntp.el
(defun url-open-telnet (name buffer host service)
  (if (not (stringp service))
      (setq service (int-to-string service)))
  (with-current-buffer (get-buffer-create buffer)
    (erase-buffer)
    (let ((proc (start-process name buffer "telnet" "-8"))
	  (case-fold-search t))
      (when (memq (process-status proc) '(open run))
	(process-send-string proc "set escape \^X\n")
	(process-send-string proc (concat
				   "open " url-gateway-telnet-host "\n"))
	(url-wait-for-string url-gateway-telnet-login-prompt proc)
	(process-send-string
	 proc (concat
	       (or url-gateway-telnet-user-name
		   (setq url-gateway-telnet-user-name (read-string "login: ")))
	       "\n"))
	(url-wait-for-string url-gateway-telnet-password-prompt proc)
	(process-send-string
	 proc (concat
	       (or url-gateway-telnet-password
		   (setq url-gateway-telnet-password
			 (read-passwd "Password: ")))
	       "\n"))
	(erase-buffer)
	(url-wait-for-string url-gateway-prompt-pattern proc)
	(process-send-string
	 proc (concat (mapconcat 'identity
				 (append url-gateway-telnet-parameters
					 (list host service)) " ") "\n"))
	(url-wait-for-string "^\r*Escape character.*\r*\n+" proc)
	(delete-region (point-min) (match-end 0))
	(process-send-string proc "\^]\n")
	(url-wait-for-string "^telnet" proc)
	(process-send-string proc "mode character\n")
	(accept-process-output proc 1)
	(sit-for 1)
	(goto-char (point-min))
	(forward-line 1)
	(delete-region (point) (point-max)))
      proc)))

;;;###autoload
(defun url-open-stream (name buffer host service)
  "Open a stream to HOST, possibly via a gateway.
Args per `open-network-stream'.
Will not make a connection if `url-gateway-unplugged' is non-nil.
Might do a non-blocking connection; use `process-status' to check."
  (unless url-gateway-unplugged
    (let ((gw-method (if (and url-gateway-local-host-regexp
			      (not (eq 'tls url-gateway-method))
			      (not (eq 'ssl url-gateway-method))
			      (string-match
			       url-gateway-local-host-regexp
			       host))
			 'native
		       url-gateway-method))
;;; 	;; This hack is for OS/2 Emacs so that it will not do bogus CRLF
;;; 	;; conversions while trying to be 'helpful'
;;; 	(tcp-binary-process-output-services (if (stringp service)
;;; 						(list service)
;;; 					      (list service
;;; 						    (int-to-string service))))

	  ;; An attempt to deal with denied connections, and attempt
	  ;; to reconnect
	  (cur-retries 0)
	  (retry t)
	  (errobj nil)
	  (conn nil))

      ;; If the user told us to do DNS for them, do it.
      (if url-gateway-broken-resolution
	  (setq host (url-gateway-nslookup-host host)))

      (condition-case errobj
	  ;; This is a clean way to ensure the new process inherits the
	  ;; right coding systems in both Emacs and XEmacs.
	  (let ((coding-system-for-read 'binary)
		(coding-system-for-write 'binary))
	    (setq conn (case gw-method
			 (tls
			  (open-tls-stream name buffer host service))
			 (ssl
			  (open-ssl-stream name buffer host service))
			 ((native)
			  ;; Use non-blocking socket if we can.
			  (make-network-process :name name :buffer buffer
						:host host :service service
						:nowait
						(featurep 'make-network-process '(:nowait t))))
			 (socks
			  (socks-open-network-stream name buffer host service))
			 (telnet
			  (url-open-telnet name buffer host service))
			 (rlogin
			  (url-open-rlogin name buffer host service))
			 (otherwise
			  (error "Bad setting of url-gateway-method: %s"
				 url-gateway-method)))))
        ;; Ignoring errors here seems wrong.  E.g. it'll throw away the
        ;; error signaled two lines above.  It was also found inconvenient
        ;; during debugging.
	;; (error
	;;  (setq conn nil))
	)
      conn)))

(provide 'url-gw)

;; arch-tag: 1c4c0317-6d03-45b8-b3f3-838bd8f9d838
;;; url-gw.el ends here