(eval-when-compile (require 'cl))
(require 'url-vars)
(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
"^[^#$%>;]*[#$%>;] *" "*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)
(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))
(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)))))
(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))
(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)))
(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))
(cur-retries 0)
(retry t)
(errobj nil)
(conn nil))
(if url-gateway-broken-resolution
(setq host (url-gateway-nslookup-host host)))
(condition-case errobj
(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)
(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)))))
)
conn)))
(provide 'url-gw)