| 1 | ;;; url-gw.el --- Gateway munging for URL loading |
| 2 | |
| 3 | ;; Copyright (C) 1997-1998, 2004-2011 |
| 4 | ;; Free Software Foundation, Inc. |
| 5 | |
| 6 | ;; Author: Bill Perry <wmperry@gnu.org> |
| 7 | ;; Keywords: comm, data, processes |
| 8 | |
| 9 | ;; This file is part of GNU Emacs. |
| 10 | |
| 11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
| 12 | ;; it under the terms of the GNU General Public License as published by |
| 13 | ;; the Free Software Foundation, either version 3 of the License, or |
| 14 | ;; (at your option) any later version. |
| 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 |
| 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
| 23 | |
| 24 | ;;; Code: |
| 25 | |
| 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") |
| 33 | (autoload 'open-tls-stream "tls") |
| 34 | |
| 35 | (defgroup url-gateway nil |
| 36 | "URL gateway variables." |
| 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 |
| 101 | linked Emacs under SunOS 4.x." |
| 102 | :type 'boolean |
| 103 | :group 'url-gateway) |
| 104 | |
| 105 | (defcustom url-gateway-nslookup-program "nslookup" |
| 106 | "If non-nil then a string naming nslookup program." |
| 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)) |
| 119 | (set-process-query-on-exit-flag proc nil) |
| 120 | (with-current-buffer (process-buffer proc) |
| 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))) |
| 169 | (with-current-buffer (get-buffer-create buffer) |
| 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 |
| 188 | (read-passwd "Password: "))) |
| 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'. |
| 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." |
| 214 | (unless url-gateway-unplugged |
| 215 | (let ((gw-method (if (and url-gateway-local-host-regexp |
| 216 | (not (eq 'tls url-gateway-method)) |
| 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 |
| 247 | (tls |
| 248 | (funcall (if (fboundp 'open-gnutls-stream) |
| 249 | 'open-gnutls-stream |
| 250 | 'open-tls-stream) |
| 251 | name buffer host service)) |
| 252 | (ssl |
| 253 | (open-ssl-stream name buffer host service)) |
| 254 | ((native) |
| 255 | ;; Use non-blocking socket if we can. |
| 256 | (make-network-process :name name :buffer buffer |
| 257 | :host host :service service |
| 258 | :nowait |
| 259 | (featurep 'make-network-process '(:nowait t)))) |
| 260 | (socks |
| 261 | (socks-open-network-stream name buffer host service)) |
| 262 | (telnet |
| 263 | (url-open-telnet name buffer host service)) |
| 264 | (rlogin |
| 265 | (url-open-rlogin name buffer host service)) |
| 266 | (otherwise |
| 267 | (error "Bad setting of url-gateway-method: %s" |
| 268 | url-gateway-method))))) |
| 269 | ;; Ignoring errors here seems wrong. E.g. it'll throw away the |
| 270 | ;; error signaled two lines above. It was also found inconvenient |
| 271 | ;; during debugging. |
| 272 | ;; (error |
| 273 | ;; (setq conn nil)) |
| 274 | ) |
| 275 | conn))) |
| 276 | |
| 277 | (provide 'url-gw) |
| 278 | |
| 279 | ;;; url-gw.el ends here |