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8c8b8430 | 1 | ;;; url-gw.el --- Gateway munging for URL loading |
00eef4de | 2 | |
ae940284 | 3 | ;; Copyright (C) 1997, 1998, 2004, 2005, 2006, 2007, 2008, 2009 |
04bf5b65 | 4 | ;; Free Software Foundation, Inc. |
00eef4de | 5 | |
8c8b8430 | 6 | ;; Author: Bill Perry <wmperry@gnu.org> |
8c8b8430 SM |
7 | ;; Keywords: comm, data, processes |
8 | ||
00eef4de LH |
9 | ;; This file is part of GNU Emacs. |
10 | ||
4936186e | 11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
00eef4de | 12 | ;; it under the terms of the GNU General Public License as published by |
4936186e GM |
13 | ;; the Free Software Foundation, either version 3 of the License, or |
14 | ;; (at your option) any later version. | |
00eef4de LH |
15 | |
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. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
4936186e | 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
00eef4de LH |
23 | |
24 | ;;; Code: | |
25 | ||
8c8b8430 SM |
26 | (eval-when-compile (require 'cl)) |
27 | (require 'url-vars) | |
28 | ||
29 | ;; Fixme: support SSH explicitly or via a url-gateway-rlogin-program? | |
30 | ||
31 | (autoload 'socks-open-network-stream "socks") | |
32 | (autoload 'open-ssl-stream "ssl") | |
5bbb0eb9 | 33 | (autoload 'open-tls-stream "tls") |
8c8b8430 SM |
34 | |
35 | (defgroup url-gateway nil | |
383168ec | 36 | "URL gateway variables." |
8c8b8430 SM |
37 | :group 'url) |
38 | ||
39 | (defcustom url-gateway-local-host-regexp nil | |
40 | "*A regular expression specifying local hostnames/machines." | |
41 | :type '(choice (const nil) regexp) | |
42 | :group 'url-gateway) | |
43 | ||
44 | (defcustom url-gateway-prompt-pattern | |
45 | "^[^#$%>;]*[#$%>;] *" ;; "bash\\|\$ *\r?$\\|> *\r?" | |
46 | "*A regular expression matching a shell prompt." | |
47 | :type 'regexp | |
48 | :group 'url-gateway) | |
49 | ||
50 | (defcustom url-gateway-rlogin-host nil | |
51 | "*What hostname to actually rlog into before doing a telnet." | |
52 | :type '(choice (const nil) string) | |
53 | :group 'url-gateway) | |
54 | ||
55 | (defcustom url-gateway-rlogin-user-name nil | |
56 | "*Username to log into the remote machine with when using rlogin." | |
57 | :type '(choice (const nil) string) | |
58 | :group 'url-gateway) | |
59 | ||
60 | (defcustom url-gateway-rlogin-parameters '("telnet" "-8") | |
61 | "*Parameters to `url-open-rlogin'. | |
62 | This list will be used as the parameter list given to rsh." | |
63 | :type '(repeat string) | |
64 | :group 'url-gateway) | |
65 | ||
66 | (defcustom url-gateway-telnet-host nil | |
67 | "*What hostname to actually login to before doing a telnet." | |
68 | :type '(choice (const nil) string) | |
69 | :group 'url-gateway) | |
70 | ||
71 | (defcustom url-gateway-telnet-parameters '("exec" "telnet" "-8") | |
72 | "*Parameters to `url-open-telnet'. | |
73 | This list will be executed as a command after logging in via telnet." | |
74 | :type '(repeat string) | |
75 | :group 'url-gateway) | |
76 | ||
77 | (defcustom url-gateway-telnet-login-prompt "^\r*.?login:" | |
78 | "*Prompt that tells us we should send our username when loggin in w/telnet." | |
79 | :type 'regexp | |
80 | :group 'url-gateway) | |
81 | ||
82 | (defcustom url-gateway-telnet-password-prompt "^\r*.?password:" | |
83 | "*Prompt that tells us we should send our password when loggin in w/telnet." | |
84 | :type 'regexp | |
85 | :group 'url-gateway) | |
86 | ||
87 | (defcustom url-gateway-telnet-user-name nil | |
88 | "User name to log in via telnet with." | |
89 | :type '(choice (const nil) string) | |
90 | :group 'url-gateway) | |
91 | ||
92 | (defcustom url-gateway-telnet-password nil | |
93 | "Password to use to log in via telnet with." | |
94 | :type '(choice (const nil) string) | |
95 | :group 'url-gateway) | |
96 | ||
97 | (defcustom url-gateway-broken-resolution nil | |
98 | "*Whether to use nslookup to resolve hostnames. | |
99 | This should be used when your version of Emacs cannot correctly use DNS, | |
100 | but your machine can. This usually happens if you are running a statically | |
d1ce47b0 | 101 | linked Emacs under SunOS 4.x." |
8c8b8430 SM |
102 | :type 'boolean |
103 | :group 'url-gateway) | |
104 | ||
105 | (defcustom url-gateway-nslookup-program "nslookup" | |
0c852d6e | 106 | "*If non-nil then a string naming nslookup program." |
8c8b8430 SM |
107 | :type '(choice (const :tag "None" :value nil) string) |
108 | :group 'url-gateway) | |
109 | ||
110 | ;; Stolen from ange-ftp | |
111 | ;;;###autoload | |
112 | (defun url-gateway-nslookup-host (host) | |
113 | "Attempt to resolve the given HOST using nslookup if possible." | |
114 | (interactive "sHost: ") | |
115 | (if url-gateway-nslookup-program | |
116 | (let ((proc (start-process " *nslookup*" " *nslookup*" | |
117 | url-gateway-nslookup-program host)) | |
118 | (res host)) | |
ed87225a | 119 | (set-process-query-on-exit-flag proc nil) |
351b838f | 120 | (with-current-buffer (process-buffer proc) |
8c8b8430 SM |
121 | (while (memq (process-status proc) '(run open)) |
122 | (accept-process-output proc)) | |
123 | (goto-char (point-min)) | |
124 | (if (re-search-forward "Name:.*\nAddress: *\\(.*\\)$" nil t) | |
125 | (setq res (buffer-substring (match-beginning 1) | |
126 | (match-end 1)))) | |
127 | (kill-buffer (current-buffer))) | |
128 | res) | |
129 | host)) | |
130 | ||
131 | ;; Stolen from red gnus nntp.el | |
132 | (defun url-wait-for-string (regexp proc) | |
133 | "Wait until string matching REGEXP arrives in process PROC's buffer." | |
134 | (let ((buf (current-buffer))) | |
135 | (goto-char (point-min)) | |
136 | (while (not (re-search-forward regexp nil t)) | |
137 | (accept-process-output proc) | |
138 | (set-buffer buf) | |
139 | (goto-char (point-min))))) | |
140 | ||
141 | ;; Stolen from red gnus nntp.el | |
142 | (defun url-open-rlogin (name buffer host service) | |
143 | "Open a connection using rsh." | |
144 | (if (not (stringp service)) | |
145 | (setq service (int-to-string service))) | |
146 | (let ((proc (if url-gateway-rlogin-user-name | |
147 | (start-process | |
148 | name buffer "rsh" | |
149 | url-gateway-rlogin-host "-l" url-gateway-rlogin-user-name | |
150 | (mapconcat 'identity | |
151 | (append url-gateway-rlogin-parameters | |
152 | (list host service)) " ")) | |
153 | (start-process | |
154 | name buffer "rsh" url-gateway-rlogin-host | |
155 | (mapconcat 'identity | |
156 | (append url-gateway-rlogin-parameters | |
157 | (list host service)) | |
158 | " "))))) | |
159 | (set-buffer buffer) | |
160 | (url-wait-for-string "^\r*200" proc) | |
161 | (beginning-of-line) | |
162 | (delete-region (point-min) (point)) | |
163 | proc)) | |
164 | ||
165 | ;; Stolen from red gnus nntp.el | |
166 | (defun url-open-telnet (name buffer host service) | |
167 | (if (not (stringp service)) | |
168 | (setq service (int-to-string service))) | |
351b838f | 169 | (with-current-buffer (get-buffer-create buffer) |
8c8b8430 SM |
170 | (erase-buffer) |
171 | (let ((proc (start-process name buffer "telnet" "-8")) | |
172 | (case-fold-search t)) | |
173 | (when (memq (process-status proc) '(open run)) | |
174 | (process-send-string proc "set escape \^X\n") | |
175 | (process-send-string proc (concat | |
176 | "open " url-gateway-telnet-host "\n")) | |
177 | (url-wait-for-string url-gateway-telnet-login-prompt proc) | |
178 | (process-send-string | |
179 | proc (concat | |
180 | (or url-gateway-telnet-user-name | |
181 | (setq url-gateway-telnet-user-name (read-string "login: "))) | |
182 | "\n")) | |
183 | (url-wait-for-string url-gateway-telnet-password-prompt proc) | |
184 | (process-send-string | |
185 | proc (concat | |
186 | (or url-gateway-telnet-password | |
187 | (setq url-gateway-telnet-password | |
af3e7f78 | 188 | (read-passwd "Password: "))) |
8c8b8430 SM |
189 | "\n")) |
190 | (erase-buffer) | |
191 | (url-wait-for-string url-gateway-prompt-pattern proc) | |
192 | (process-send-string | |
193 | proc (concat (mapconcat 'identity | |
194 | (append url-gateway-telnet-parameters | |
195 | (list host service)) " ") "\n")) | |
196 | (url-wait-for-string "^\r*Escape character.*\r*\n+" proc) | |
197 | (delete-region (point-min) (match-end 0)) | |
198 | (process-send-string proc "\^]\n") | |
199 | (url-wait-for-string "^telnet" proc) | |
200 | (process-send-string proc "mode character\n") | |
201 | (accept-process-output proc 1) | |
202 | (sit-for 1) | |
203 | (goto-char (point-min)) | |
204 | (forward-line 1) | |
205 | (delete-region (point) (point-max))) | |
206 | proc))) | |
207 | ||
208 | ;;;###autoload | |
209 | (defun url-open-stream (name buffer host service) | |
210 | "Open a stream to HOST, possibly via a gateway. | |
211 | Args per `open-network-stream'. | |
5695d1dd CY |
212 | Will not make a connection if `url-gateway-unplugged' is non-nil. |
213 | Might do a non-blocking connection; use `process-status' to check." | |
8c8b8430 SM |
214 | (unless url-gateway-unplugged |
215 | (let ((gw-method (if (and url-gateway-local-host-regexp | |
5bbb0eb9 | 216 | (not (eq 'tls url-gateway-method)) |
8c8b8430 SM |
217 | (not (eq 'ssl url-gateway-method)) |
218 | (string-match | |
219 | url-gateway-local-host-regexp | |
220 | host)) | |
221 | 'native | |
222 | url-gateway-method)) | |
223 | ;;; ;; This hack is for OS/2 Emacs so that it will not do bogus CRLF | |
224 | ;;; ;; conversions while trying to be 'helpful' | |
225 | ;;; (tcp-binary-process-output-services (if (stringp service) | |
226 | ;;; (list service) | |
227 | ;;; (list service | |
228 | ;;; (int-to-string service)))) | |
229 | ||
230 | ;; An attempt to deal with denied connections, and attempt | |
231 | ;; to reconnect | |
232 | (cur-retries 0) | |
233 | (retry t) | |
234 | (errobj nil) | |
235 | (conn nil)) | |
236 | ||
237 | ;; If the user told us to do DNS for them, do it. | |
238 | (if url-gateway-broken-resolution | |
239 | (setq host (url-gateway-nslookup-host host))) | |
240 | ||
241 | (condition-case errobj | |
242 | ;; This is a clean way to ensure the new process inherits the | |
243 | ;; right coding systems in both Emacs and XEmacs. | |
244 | (let ((coding-system-for-read 'binary) | |
245 | (coding-system-for-write 'binary)) | |
246 | (setq conn (case gw-method | |
5bbb0eb9 SJ |
247 | (tls |
248 | (open-tls-stream name buffer host service)) | |
8c8b8430 SM |
249 | (ssl |
250 | (open-ssl-stream name buffer host service)) | |
251 | ((native) | |
5695d1dd CY |
252 | ;; Use non-blocking socket if we can. |
253 | (make-network-process :name name :buffer buffer | |
254 | :host host :service service | |
0c852d6e | 255 | :nowait |
080234b6 | 256 | (featurep 'make-network-process '(:nowait t)))) |
8c8b8430 SM |
257 | (socks |
258 | (socks-open-network-stream name buffer host service)) | |
259 | (telnet | |
260 | (url-open-telnet name buffer host service)) | |
261 | (rlogin | |
262 | (url-open-rlogin name buffer host service)) | |
263 | (otherwise | |
264 | (error "Bad setting of url-gateway-method: %s" | |
265 | url-gateway-method))))) | |
351b838f | 266 | ;; Ignoring errors here seems wrong. E.g. it'll throw away the |
04bf5b65 | 267 | ;; error signaled two lines above. It was also found inconvenient |
351b838f SM |
268 | ;; during debugging. |
269 | ;; (error | |
270 | ;; (setq conn nil)) | |
271 | ) | |
8c8b8430 SM |
272 | conn))) |
273 | ||
274 | (provide 'url-gw) | |
e5566bd5 | 275 | |
351b838f | 276 | ;; arch-tag: 1c4c0317-6d03-45b8-b3f3-838bd8f9d838 |
00eef4de | 277 | ;;; url-gw.el ends here |