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1 ;;; url-gw.el --- Gateway munging for URL loading
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2 ;; Author: wmperry
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118
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3 ;; Created: 1997/03/27 21:29:24
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4 ;; Version: 1.8
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5 ;; Keywords: comm, data, processes
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6
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7 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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8 ;;; Copyright (c) 1997 Free Software Foundation, Inc.
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9 ;;;
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10 ;;; This file is not part of GNU Emacs, but the same permissions apply.
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11 ;;;
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12 ;;; GNU Emacs is free software; you can redistribute it and/or modify
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13 ;;; it under the terms of the GNU General Public License as published by
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14 ;;; the Free Software Foundation; either version 2, or (at your option)
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15 ;;; any later version.
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16 ;;;
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17 ;;; GNU Emacs is distributed in the hope that it will be useful,
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18 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 ;;; GNU General Public License for more details.
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21 ;;;
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22 ;;; You should have received a copy of the GNU General Public License
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23 ;;; along with GNU Emacs; see the file COPYING. If not, write to the
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24 ;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;;; Boston, MA 02111-1307, USA.
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26 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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27 (require 'cl)
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28
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29 (defvar url-gateway-local-host-regexp nil
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30 "*A regular expression specifying local hostnames/machines.")
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31
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32 (defvar url-gateway-prompt-pattern
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33 "^[^#$%>;]*[#$%>;] *" ;; "bash\\|\$ *\r?$\\|> *\r?"
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34 "*A regular expression matching a shell prompt.")
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35
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36 (defvar url-gateway-rlogin-host nil
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37 "*What hostname to actually rlog into before doing a telnet.")
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38
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39 (defvar url-gateway-rlogin-user-name nil
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40 "*Username to log into the remote machine with when using rlogin.")
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41
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42 (defvar url-gateway-rlogin-parameters '("telnet" "-8")
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43 "*Parameters to `url-open-rlogin'.
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44 This list will be used as the parameter list given to rsh.")
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45
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46 (defvar url-gateway-telnet-host nil
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47 "*What hostname to actually login to before doing a telnet.")
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48
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49 (defvar url-gateway-telnet-parameters '("exec" "telnet" "-8")
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50 "*Parameters to `url-open-telnet'.
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51 This list will be executed as a command after logging in via telnet.")
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52
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53 (defvar url-gateway-telnet-login-prompt "^\r*.?login:"
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54 "*Prompt that tells us we should send our username when loggin in w/telnet.")
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55
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56 (defvar url-gateway-telnet-password-prompt "^\r*.?password:"
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57 "*Prompt that tells us we should send our password when loggin in w/telnet.")
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58
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59 (defvar url-gateway-telnet-user-name nil
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60 "User name to log in via telnet with.")
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61
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62 (defvar url-gateway-telnet-password nil
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63 "Password to use to log in via telnet with.")
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64
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65 (defvar url-gateway-broken-resolution nil
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66 "*Whether to use nslookup to resolve hostnames.
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67 This should be used when your version of Emacs cannot correctly use DNS,
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68 but your machine can. This usually happens if you are running a statically
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69 linked Emacs under SunOS 4.x")
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70
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71 (defvar url-gateway-nslookup-program "nslookup"
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72 "*If non-NIL then a string naming nslookup program." )
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73
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74 ;; Stolen from ange-ftp
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75 ;;;###autoload
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76 (defun url-gateway-nslookup-host (host)
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77 "Attempt to resolve the given HOSTNAME using nslookup if possible."
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78 (interactive "sHost: ")
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79 (if url-gateway-nslookup-program
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80 (let ((proc (start-process " *nslookup*" " *nslookup*"
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81 url-gateway-nslookup-program host))
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82 (res host))
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83 (process-kill-without-query proc)
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84 (save-excursion
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85 (set-buffer (process-buffer proc))
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86 (while (memq (process-status proc) '(run open))
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87 (accept-process-output proc))
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88 (goto-char (point-min))
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89 (if (re-search-forward "Name:.*\nAddress: *\\(.*\\)$" nil t)
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90 (setq res (buffer-substring (match-beginning 1)
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91 (match-end 1))))
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92 (kill-buffer (current-buffer)))
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93 res)
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94 host))
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95
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96 ;; Stolen from red gnus nntp.el
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97 (defun url-wait-for-string (regexp proc)
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98 "Wait until string arrives in the buffer."
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99 (let ((buf (current-buffer)))
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100 (goto-char (point-min))
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101 (while (not (re-search-forward regexp nil t))
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102 (accept-process-output proc)
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103 (set-buffer buf)
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104 (goto-char (point-min)))))
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105
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106 ;; Stolen from red gnus nntp.el
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107 (defun url-open-rlogin (name buffer host service)
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108 "Open a connection using rsh."
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109 (if (not (stringp service))
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116
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110 (setq service (int-to-string service)))
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111 (let ((proc (if url-gateway-rlogin-user-name
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112 (start-process
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113 name buffer "rsh"
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114 url-gateway-rlogin-host "-l" url-gateway-rlogin-user-name
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115 (mapconcat 'identity
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116 (append url-gateway-rlogin-parameters
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117 (list host service)) " "))
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118 (start-process
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119 name buffer "rsh" url-gateway-rlogin-host
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120 (mapconcat 'identity
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121 (append url-gateway-rlogin-parameters
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122 (list host service))
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123 " ")))))
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124 (set-buffer buffer)
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125 (url-wait-for-string "^\r*200" proc)
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126 (beginning-of-line)
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127 (delete-region (point-min) (point))
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128 proc))
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129
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130 ;; Stolen from red gnus nntp.el
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131 (defun url-open-telnet (name buffer host service)
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132 (if (not (stringp service))
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116
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133 (setq service (int-to-string service)))
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134 (save-excursion
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135 (set-buffer (get-buffer-create buffer))
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136 (erase-buffer)
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137 (let ((proc (start-process name buffer "telnet" "-8"))
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138 (case-fold-search t))
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139 (when (memq (process-status proc) '(open run))
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140 (process-send-string proc "set escape \^X\n")
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141 (process-send-string proc (concat
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142 "open " url-gateway-telnet-host "\n"))
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143 (url-wait-for-string url-gateway-telnet-login-prompt proc)
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144 (process-send-string
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145 proc (concat
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146 (or url-gateway-telnet-user-name
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147 (setq url-gateway-telnet-user-name (read-string "login: ")))
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148 "\n"))
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149 (url-wait-for-string url-gateway-telnet-password-prompt proc)
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150 (process-send-string
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151 proc (concat
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152 (or url-gateway-telnet-password
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153 (setq url-gateway-telnet-password
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154 (funcall url-passwd-entry-func "Password: ")))
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155 "\n"))
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156 (erase-buffer)
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157 (url-wait-for-string url-gateway-prompt-pattern proc)
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158 (process-send-string
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159 proc (concat (mapconcat 'identity
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160 (append url-gateway-telnet-parameters
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161 (list host service)) " ") "\n"))
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162 (url-wait-for-string "^\r*Escape character.*\r*\n+" proc)
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163 (delete-region (point-min) (match-end 0))
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164 (process-send-string proc "\^]\n")
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165 (url-wait-for-string "^telnet" proc)
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166 (process-send-string proc "mode character\n")
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167 (accept-process-output proc 1)
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168 (sit-for 1)
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169 (goto-char (point-min))
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170 (forward-line 1)
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171 (delete-region (point) (point-max)))
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172 proc)))
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173
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174 ;;###autoload
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175 (defun url-open-stream (name buffer host service)
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176 "Open a stream to a host"
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177 (let ((gw-method (if (and url-gateway-local-host-regexp
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178 (not (eq 'ssl url-gateway-method))
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179 (string-match
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180 url-gateway-local-host-regexp
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181 host))
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182 'native
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183 url-gateway-method))
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184 ;; This hack is for OS/2 Emacs so that it will not do bogus CRLF
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185 ;; conversions while trying to be 'helpful'
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186 (tcp-binary-process-output-services (if (stringp service)
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187 (list service)
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188 (list service
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189 (int-to-string service))))
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190
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191 ;; An attempt to deal with denied connections, and attempt to reconnect
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192 (cur-retries 0)
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193 (retry t)
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194 (errobj nil)
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195 (conn nil))
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196
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197 ;; If the user told us to do DNS for them, do it.
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198 (if url-gateway-broken-resolution
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98
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199 (setq host (url-gateway-nslookup-host host)))
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200
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98
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201 (condition-case errobj
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202 (setq conn (case gw-method
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203 (ssl
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204 (open-ssl-stream name buffer host service))
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205 ((tcp native)
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206 (and (eq 'tcp gw-method) (require 'tcp))
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207 (open-network-stream name buffer host service))
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208 (socks
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209 (socks-open-network-stream name buffer host service))
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210 (telnet
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211 (url-open-telnet name buffer host service))
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212 (rlogin
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213 (url-open-rlogin name buffer host service))
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214 (otherwise
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215 (error "Bad setting of url-gateway-method: %s"
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216 url-gateway-method))))
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217 (error
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218 (insert "Could not contact host: " host " / "
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219 (if (stringp service) service (int-to-string service))
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220 "\nAttempted using gateway method: "
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221 (symbol-name gw-method)
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222 "\n---- Error was: ----\n")
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223 (setq url-current-mime-headers '(("content-type" . "text/plain")))
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224 (display-error errobj (current-buffer))))
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225 (if conn
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226 (mule-inhibit-code-conversion conn))
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227 conn))
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228
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229 (provide 'url-gw)
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