661 lines
23 KiB
EmacsLisp
661 lines
23 KiB
EmacsLisp
;;; socks.el --- A Socks v5 Client for Emacs -*- lexical-binding:t -*-
|
||
|
||
;; Copyright (C) 1996-2000, 2002, 2007-2024 Free Software Foundation,
|
||
;; Inc.
|
||
|
||
;; Author: William M. Perry <wmperry@gnu.org>
|
||
;; Dave Love <fx@gnu.org>
|
||
;; Keywords: comm, firewalls
|
||
|
||
;; 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 <https://www.gnu.org/licenses/>.
|
||
|
||
;;; Commentary:
|
||
|
||
;; This is an implementation of the SOCKS v5 protocol as defined in
|
||
;; RFC 1928.
|
||
|
||
;; TODO
|
||
;; - Finish the redirection rules stuff
|
||
;; - Implement composition of servers. Recursively evaluate the
|
||
;; redirection rules and do SOCKS-over-HTTP and SOCKS-in-SOCKS
|
||
|
||
;;; Code:
|
||
|
||
(eval-when-compile (require 'cl-lib))
|
||
|
||
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
;; ;;; Custom widgets
|
||
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
||
;; (eval-when-compile
|
||
;; (require 'wid-edit))
|
||
|
||
;; (define-widget 'dynamic-choice 'menu-choice
|
||
;; "A pretty simple dynamic dropdown list"
|
||
;; :format "%[%t%]: %v"
|
||
;; :tag "Network"
|
||
;; :case-fold t
|
||
;; :void '(item :format "invalid (%t)\n")
|
||
;; :value-create 's5-widget-value-create
|
||
;; :value-delete 'widget-children-value-delete
|
||
;; :value-get 'widget-choice-value-get
|
||
;; :value-inline 'widget-choice-value-inline
|
||
;; :mouse-down-action 'widget-choice-mouse-down-action
|
||
;; :action 'widget-choice-action
|
||
;; :error "Make a choice"
|
||
;; :validate 'widget-choice-validate
|
||
;; :match 's5-dynamic-choice-match
|
||
;; :match-inline 's5-dynamic-choice-match-inline)
|
||
;;
|
||
;; (defun s5-dynamic-choice-match (widget value)
|
||
;; (let ((choices (funcall (widget-get widget :choice-function)))
|
||
;; current found)
|
||
;; (while (and choices (not found))
|
||
;; (setq current (car choices)
|
||
;; choices (cdr choices)
|
||
;; found (widget-apply current :match value)))
|
||
;; found))
|
||
;;
|
||
;; (defun s5-dynamic-choice-match-inline (widget value)
|
||
;; (let ((choices (funcall (widget-get widget :choice-function)))
|
||
;; current found)
|
||
;; (while (and choices (not found))
|
||
;; (setq current (car choices)
|
||
;; choices (cdr choices)
|
||
;; found (widget-match-inline current value)))
|
||
;; found))
|
||
;;
|
||
;; (defun s5-widget-value-create (widget)
|
||
;; (let ((choices (funcall (widget-get widget :choice-function)))
|
||
;; (value (widget-get widget :value)))
|
||
;; (if (not value)
|
||
;; (widget-put widget :value (widget-value (car choices))))
|
||
;; (widget-put widget :args choices)
|
||
;; (widget-choice-value-create widget)))
|
||
|
||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
;;; Customization support
|
||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
(defgroup socks nil
|
||
"SOCKS support."
|
||
:version "22.2"
|
||
:prefix "socks-"
|
||
:group 'processes)
|
||
|
||
;; (defcustom socks-server-aliases nil
|
||
;; "A list of server aliases for use in access control and filtering rules."
|
||
;; :type '(repeat (list :format "%v"
|
||
;; :value ("" "" 1080 5)
|
||
;; (string :tag "Alias")
|
||
;; (string :tag "Hostname/IP Address")
|
||
;; (integer :tag "Port #")
|
||
;; (choice :tag "SOCKS Version"
|
||
;; (integer :tag "SOCKS v4" :value 4)
|
||
;; (integer :tag "SOCKS v5" :value 5)))))
|
||
;;
|
||
;; (defcustom socks-network-aliases
|
||
;; '(("Anywhere" (netmask "0.0.0.0" "0.0.0.0")))
|
||
;; "A list of network aliases for use in subsequent rules."
|
||
;; :type '(repeat (list :format "%v"
|
||
;; :value (netmask "" "255.255.255.0")
|
||
;; (string :tag "Alias")
|
||
;; (radio-button-choice
|
||
;; :format "%v"
|
||
;; (list :tag "IP address range"
|
||
;; (const :format "" :value range)
|
||
;; (string :tag "From")
|
||
;; (string :tag "To"))
|
||
;; (list :tag "IP address/netmask"
|
||
;; (const :format "" :value netmask)
|
||
;; (string :tag "IP Address")
|
||
;; (string :tag "Netmask"))
|
||
;; (list :tag "Domain Name"
|
||
;; (const :format "" :value domain)
|
||
;; (string :tag "Domain name"))
|
||
;; (list :tag "Unique hostname/IP address"
|
||
;; (const :format "" :value exact)
|
||
;; (string :tag "Hostname/IP Address"))))))
|
||
;;
|
||
;; (defun s5-servers-filter ()
|
||
;; (if socks-server-aliases
|
||
;; (mapcar (lambda (x) (list 'const :tag (car x) :value (car x))) s5-server-aliases)
|
||
;; '((const :tag "No aliases defined" :value nil))))
|
||
;;
|
||
;; (defun s5-network-aliases-filter ()
|
||
;; (mapcar (lambda (x) (list 'const :tag (car x) :value (car x)))
|
||
;; socks-network-aliases))
|
||
;;
|
||
;; (defcustom socks-redirection-rules
|
||
;; nil
|
||
;; "A list of redirection rules."
|
||
;; :type '(repeat (list :format "%v"
|
||
;; :value ("Anywhere" nil)
|
||
;; (dynamic-choice :choice-function s5-network-aliases-filter
|
||
;; :tag "Destination network")
|
||
;; (radio-button-choice
|
||
;; :tag "Connection type"
|
||
;; (const :tag "Direct connection" :value nil)
|
||
;; (dynamic-choice :format "%t: %[%v%]"
|
||
;; :choice-function s5-servers-filter
|
||
;; :tag "Proxy chain via")))))
|
||
|
||
(defcustom socks-server
|
||
(list "Default server" "socks" 1080 5)
|
||
"Socks server."
|
||
:type '(list
|
||
(string :format "" :value "Default server")
|
||
(string :tag "Server")
|
||
(integer :tag "Port")
|
||
(radio-button-choice :tag "SOCKS Version"
|
||
:format "%t: %v"
|
||
(const :tag "SOCKS v4 " :format "%t" :value 4)
|
||
(const :tag "SOCKS v4a" :format "%t" :value 4a)
|
||
(const :tag "SOCKS v5" :format "%t" :value 5))))
|
||
|
||
|
||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
;;; Get down to the nitty gritty
|
||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
(defconst socks-version 5)
|
||
(defvar socks-debug nil)
|
||
|
||
;; Common socks v5 commands
|
||
(defconst socks-connect-command 1)
|
||
(defconst socks-bind-command 2)
|
||
(defconst socks-udp-associate-command 3)
|
||
|
||
;; Miscellaneous other socks constants
|
||
(defconst socks-authentication-null 0)
|
||
(defconst socks-authentication-failure 255)
|
||
|
||
;; Response codes
|
||
(defconst socks-response-success 0)
|
||
(defconst socks-response-general-failure 1)
|
||
(defconst socks-response-access-denied 2)
|
||
(defconst socks-response-network-unreachable 3)
|
||
(defconst socks-response-host-unreachable 4)
|
||
(defconst socks-response-connection-refused 5)
|
||
(defconst socks-response-ttl-expired 6)
|
||
(defconst socks-response-cmd-not-supported 7)
|
||
(defconst socks-response-address-not-supported 8)
|
||
|
||
(defvar socks-errors
|
||
'("Succeeded"
|
||
"General SOCKS server failure"
|
||
"Connection not allowed by ruleset"
|
||
"Network unreachable"
|
||
"Host unreachable"
|
||
"Connection refused"
|
||
"Time-to-live expired"
|
||
"Command not supported"
|
||
"Address type not supported"))
|
||
|
||
(defconst socks--errors-4
|
||
'("Granted"
|
||
"Rejected or failed"
|
||
"Cannot connect to identd on the client"
|
||
"Client and identd report differing user IDs"))
|
||
|
||
;; The socks v5 address types
|
||
(defconst socks-address-type-v4 1)
|
||
(defconst socks-address-type-name 3)
|
||
(defconst socks-address-type-v6 4)
|
||
|
||
;; Base variables
|
||
(defvar socks-timeout 5)
|
||
|
||
;; Miscellaneous stuff for authentication
|
||
(defvar socks-authentication-methods nil)
|
||
(defvar socks-username (user-login-name))
|
||
(defvar socks-password nil)
|
||
|
||
(defun socks-register-authentication-method (id desc callback)
|
||
(let ((old (assq id socks-authentication-methods)))
|
||
(if old
|
||
(setcdr old (cons desc callback))
|
||
(setq socks-authentication-methods
|
||
(cons (cons id (cons desc callback))
|
||
socks-authentication-methods)))))
|
||
|
||
(defun socks-unregister-authentication-method (id)
|
||
(let ((old (assq id socks-authentication-methods)))
|
||
(if old
|
||
(setq socks-authentication-methods
|
||
(delq old socks-authentication-methods)))))
|
||
|
||
(socks-register-authentication-method 0 "No authentication" 'identity)
|
||
|
||
(defun socks-build-auth-list ()
|
||
(let ((num 0)
|
||
(retval ""))
|
||
(mapc
|
||
(lambda (x)
|
||
(if (fboundp (cdr (cdr x)))
|
||
(setq retval (format "%s%c" retval (car x))
|
||
num (1+ num))))
|
||
(reverse socks-authentication-methods))
|
||
(format "%c%s" num retval)))
|
||
|
||
(defconst socks-state-waiting-for-auth 0)
|
||
(defconst socks-state-submethod-negotiation 1)
|
||
(defconst socks-state-authenticated 2)
|
||
(defconst socks-state-waiting 3)
|
||
(defconst socks-state-connected 4)
|
||
|
||
(defun socks-wait-for-state-change (proc cur-state)
|
||
(while (and (= (process-get proc 'socks-state) cur-state)
|
||
(memq (process-status proc) '(run open)))
|
||
(accept-process-output proc socks-timeout)))
|
||
|
||
(defun socks-filter (proc string)
|
||
(let (state version desired-len)
|
||
(or (process-get proc 'socks)
|
||
(error "socks-filter called on non-SOCKS connection %S" proc))
|
||
(setq state (process-get proc 'socks-state))
|
||
(cond
|
||
((= state socks-state-waiting-for-auth)
|
||
(cl-callf (lambda (s) (setq string (concat s string)))
|
||
(process-get proc 'socks-scratch))
|
||
(if (< (length string) 2)
|
||
nil ; We need to spin some more
|
||
(process-put proc 'socks-authtype (aref string 1))
|
||
(process-put proc 'socks-scratch (substring string 2 nil))
|
||
(process-put proc 'socks-state socks-state-submethod-negotiation)))
|
||
((= state socks-state-submethod-negotiation)
|
||
)
|
||
((= state socks-state-authenticated)
|
||
)
|
||
((= state socks-state-waiting)
|
||
(cl-callf (lambda (s) (setq string (concat s string)))
|
||
(process-get proc 'socks-scratch))
|
||
(setq version (process-get proc 'socks-server-protocol))
|
||
(cond
|
||
((equal version 'http)
|
||
(if (not (string-search "\r\n\r\n" string))
|
||
nil ; Need to spin some more
|
||
(process-put proc 'socks-state socks-state-connected)
|
||
(process-put proc 'socks-reply 0)
|
||
(process-put proc 'socks-response string)))
|
||
((equal version 4)
|
||
(if (< (length string) 2)
|
||
nil ; Can't know how much to read yet
|
||
(setq desired-len
|
||
(+ 4 ; address length
|
||
2 ; port
|
||
2 ; initial data
|
||
))
|
||
(if (< (length string) desired-len)
|
||
nil ; need to spin some more
|
||
(let ((response (aref string 1)))
|
||
(if (= response 90)
|
||
(setq response 0))
|
||
(process-put proc 'socks-state socks-state-connected)
|
||
(process-put proc 'socks-reply response)
|
||
(process-put proc 'socks-response string)))))
|
||
((equal version 5)
|
||
(if (< (length string) 4)
|
||
nil
|
||
(setq desired-len
|
||
(+ 6 ; Standard socks header
|
||
(pcase (aref string 3)
|
||
((pred (= socks-address-type-v4)) 4)
|
||
((pred (= socks-address-type-v6)) 16)
|
||
((pred (= socks-address-type-name))
|
||
(if (< (length string) 5)
|
||
255
|
||
(+ 1 (aref string 4))))
|
||
(0 0))))
|
||
(if (< (length string) desired-len)
|
||
nil ; Need to spin some more
|
||
(process-put proc 'socks-state socks-state-connected)
|
||
(process-put proc 'socks-reply (aref string 1))
|
||
(process-put proc 'socks-response string))))))
|
||
((= state socks-state-connected)))))
|
||
|
||
;; FIXME this is a terrible idea.
|
||
;; It is not even compatible with the argument spec of open-network-stream
|
||
;; in 24.1.
|
||
|
||
(defvar socks-override-functions nil
|
||
"If non-nil, overwrite `open-network-stream' function with SOCKSified version.")
|
||
|
||
(when socks-override-functions
|
||
(advice-add 'open-network-stream :around #'socks--open-network-stream))
|
||
|
||
(defun socks-open-connection (server-info)
|
||
(save-excursion
|
||
(let ((proc
|
||
(let ((socks-override-functions nil))
|
||
(open-network-stream "socks"
|
||
nil
|
||
(nth 1 server-info)
|
||
(nth 2 server-info))))
|
||
(authtype nil)
|
||
version)
|
||
|
||
;; Initialize process and info about the process
|
||
(set-process-filter proc #'socks-filter)
|
||
(set-process-query-on-exit-flag proc nil)
|
||
(process-put proc 'socks t)
|
||
(process-put proc 'socks-state socks-state-waiting-for-auth)
|
||
(process-put proc 'socks-authtype socks-authentication-failure)
|
||
(process-put proc 'socks-server-protocol (nth 3 server-info))
|
||
(process-put proc 'socks-server-name (nth 1 server-info))
|
||
(setq version (nth 3 server-info))
|
||
(cond
|
||
((equal version 'http)
|
||
;; Don't really have to do any connection setup under http
|
||
nil)
|
||
((equal version 4)
|
||
;; Don't really have to do any connection setup under v4
|
||
nil)
|
||
((equal version 5)
|
||
;; Need to handle all the authentication crap under v5
|
||
;; Send what we think we can handle for authentication types
|
||
(process-send-string proc (format "%c%s" socks-version
|
||
(socks-build-auth-list)))
|
||
|
||
;; Basically just do a select() until we change states.
|
||
(socks-wait-for-state-change proc socks-state-waiting-for-auth)
|
||
(setq authtype (process-get proc 'socks-authtype))
|
||
(cond
|
||
((= authtype socks-authentication-null)
|
||
(and socks-debug (message "No authentication necessary")))
|
||
((= authtype socks-authentication-failure)
|
||
(error "No acceptable authentication methods found"))
|
||
(t
|
||
(let* ((auth-type (process-get proc 'socks-authtype))
|
||
(auth-handler (assoc auth-type socks-authentication-methods))
|
||
(auth-func (and auth-handler (cdr (cdr auth-handler))))
|
||
(auth-desc (and auth-handler (car (cdr auth-handler)))))
|
||
(set-process-filter proc nil)
|
||
(if (and auth-func (fboundp auth-func)
|
||
(funcall auth-func proc))
|
||
nil ; We succeeded!
|
||
(delete-process proc)
|
||
(error "Failed to use auth method: %s (%d)"
|
||
(or auth-desc "Unknown") auth-type))
|
||
)
|
||
)
|
||
)
|
||
(process-put proc 'socks-state socks-state-authenticated)
|
||
(process-put proc 'socks-scratch "")
|
||
(set-process-filter proc #'socks-filter)))
|
||
proc)))
|
||
|
||
(defun socks-send-command (proc command atype address port)
|
||
"Send COMMAND to SOCKS service PROC for proxying ADDRESS and PORT.
|
||
When ATYPE indicates an IP, param ADDRESS must be given as raw bytes."
|
||
(let ((addr (cond
|
||
((or (= atype socks-address-type-v4)
|
||
(= atype socks-address-type-v6))
|
||
address)
|
||
((= atype socks-address-type-name)
|
||
(format "%c%s" (length address) address))
|
||
(t
|
||
(error "Unknown address type: %d" atype))))
|
||
trailing
|
||
request version)
|
||
(or (process-get proc 'socks)
|
||
(error "socks-send-command called on non-SOCKS connection %S" proc))
|
||
(process-put proc 'socks-state socks-state-waiting)
|
||
(setq version (process-get proc 'socks-server-protocol))
|
||
(cond
|
||
((equal version 'http)
|
||
(setq request (format (concat
|
||
"CONNECT %s:%d HTTP/1.0\r\n"
|
||
"User-Agent: Emacs/SOCKS v1.0\r\n"
|
||
"\r\n")
|
||
(cond
|
||
((equal atype socks-address-type-name) address)
|
||
(t
|
||
(error "Unsupported address type for HTTP: %d" atype)))
|
||
port)))
|
||
((and (eq version '4a)
|
||
(setf addr "\0\0\0\1"
|
||
trailing (concat address "\0")
|
||
version 4 ; become version 4
|
||
(process-get proc 'socks-server-protocol) 4)
|
||
nil)) ; fall through
|
||
((equal version 4)
|
||
(setq request (concat
|
||
(unibyte-string
|
||
version ; version
|
||
command ; command
|
||
(ash port -8) ; port, high byte
|
||
(logand port #xff)) ; port, low byte
|
||
addr ; address
|
||
socks-username ; username
|
||
"\0" ; terminate username
|
||
trailing))) ; optional host to look up
|
||
((equal version 5)
|
||
(setq request (concat
|
||
(unibyte-string
|
||
version ; version
|
||
command ; command
|
||
0 ; reserved
|
||
atype) ; address type
|
||
addr ; address
|
||
(unibyte-string
|
||
(ash port -8) ; port, high byte
|
||
(logand port #xff))))) ; port, low byte
|
||
(t
|
||
(error "Unknown protocol version: %d" version)))
|
||
(process-send-string proc request)
|
||
(socks-wait-for-state-change proc socks-state-waiting)
|
||
(process-status proc)
|
||
(if (= (or (process-get proc 'socks-reply) 1) socks-response-success)
|
||
nil ; Sweet sweet success!
|
||
(delete-process proc)
|
||
(error "SOCKS: %s"
|
||
(let ((err (process-get proc 'socks-reply)))
|
||
(if (eql version 5)
|
||
(nth (or err 1) socks-errors)
|
||
;; The defined error codes for v4 range from
|
||
;; 90-93, but we store them in a simple list.
|
||
(nth (pcase err (90 0) (92 2) (93 3) (_ 1))
|
||
socks--errors-4)))))
|
||
proc))
|
||
|
||
|
||
;; Replacement functions for open-network-stream, etc.
|
||
(defvar socks-noproxy nil
|
||
"List of regexps matching hosts that we should not socksify connections to.")
|
||
|
||
(defun socks-find-route (host _service)
|
||
(let ((route socks-server)
|
||
(noproxy socks-noproxy))
|
||
(while noproxy
|
||
(if (eq ?! (aref (car noproxy) 0))
|
||
(if (string-match (substring (car noproxy) 1) host)
|
||
(setq noproxy nil))
|
||
(if (string-match (car noproxy) host)
|
||
(setq route nil
|
||
noproxy nil)))
|
||
(setq noproxy (cdr noproxy)))
|
||
route))
|
||
|
||
(defvar socks-services-file "/etc/services")
|
||
(defvar socks-tcp-services (make-hash-table :size 13 :test 'equal))
|
||
(defvar socks-udp-services (make-hash-table :size 13 :test 'equal))
|
||
|
||
(defun socks-parse-services ()
|
||
(if (not (and (file-exists-p socks-services-file)
|
||
(file-readable-p socks-services-file)))
|
||
(error "Could not find services file: %s" socks-services-file))
|
||
(clrhash socks-tcp-services)
|
||
(clrhash socks-udp-services)
|
||
(with-current-buffer (get-buffer-create " *socks-tmp*")
|
||
(erase-buffer)
|
||
(insert-file-contents socks-services-file)
|
||
;; Nuke comments
|
||
(goto-char (point-min))
|
||
(while (re-search-forward "#.*" nil t)
|
||
(replace-match ""))
|
||
;; Nuke empty lines
|
||
(goto-char (point-min))
|
||
(while (re-search-forward "^[ \t\n]+" nil t)
|
||
(replace-match ""))
|
||
;; Now find all the lines
|
||
(goto-char (point-min))
|
||
(let (name port type)
|
||
(while (re-search-forward "^\\([^ \t]+\\)[ \t]+\\([0-9]+\\)/\\([a-z]+\\)"
|
||
nil t)
|
||
(setq name (downcase (match-string 1))
|
||
port (string-to-number (match-string 2))
|
||
type (downcase (match-string 3)))
|
||
(puthash name port (if (equal type "udp")
|
||
socks-udp-services
|
||
socks-tcp-services))))))
|
||
|
||
(defun socks-find-services-entry (service &optional udp)
|
||
"Return the port # associated with SERVICE."
|
||
(if (= (hash-table-count socks-tcp-services) 0)
|
||
(socks-parse-services))
|
||
(gethash (downcase service)
|
||
(if udp socks-udp-services socks-tcp-services)))
|
||
|
||
(defun socks-open-network-stream (name buffer host service)
|
||
(let ((socks-override-functions t))
|
||
(socks--open-network-stream
|
||
(lambda (&rest args)
|
||
(let ((socks-override-functions nil))
|
||
(apply #'open-network-stream args)))
|
||
name buffer host service)))
|
||
|
||
(defun socks--open-network-stream (orig-fun name buffer host service &rest params)
|
||
(let ((route (and socks-override-functions
|
||
(socks-find-route host service))))
|
||
(if (not route)
|
||
(apply orig-fun name buffer host service params)
|
||
;; FIXME: Obey `params'!
|
||
(let* ((proc (socks-open-connection route))
|
||
(version (process-get proc 'socks-server-protocol))
|
||
(atype
|
||
(cond
|
||
((equal version 4)
|
||
(setq host (socks-nslookup-host host))
|
||
(if (not (listp host))
|
||
(error "Could not get IP address for: %s" host))
|
||
(setq host (apply #'unibyte-string host))
|
||
socks-address-type-v4)
|
||
(t
|
||
socks-address-type-name))))
|
||
(socks-send-command proc
|
||
socks-connect-command
|
||
atype
|
||
host
|
||
(if (stringp service)
|
||
(or
|
||
(socks-find-services-entry service)
|
||
(error "Unknown service: %s" service))
|
||
service))
|
||
(process-put proc 'socks-buffer buffer)
|
||
(process-put proc 'socks-host host)
|
||
(process-put proc 'socks-service service)
|
||
(set-process-filter proc nil)
|
||
(set-process-buffer proc (if buffer (get-buffer-create buffer)))
|
||
proc))))
|
||
|
||
;; Authentication modules go here
|
||
|
||
;; Basic username/password authentication, ala RFC 1929
|
||
(socks-register-authentication-method 2 "Username/Password"
|
||
'socks-username/password-auth)
|
||
|
||
(defconst socks-username/password-auth-version 1)
|
||
|
||
(defun socks-username/password-auth-filter (proc str)
|
||
(or (process-get proc 'socks)
|
||
(error "socks-filter called on non-SOCKS connection %S" proc))
|
||
(cl-callf (lambda (s) (concat s str))
|
||
(process-get proc 'socks-scratch))
|
||
(if (< (length (process-get proc 'socks-scratch)) 2)
|
||
nil
|
||
(process-put proc 'socks-password-auth-status
|
||
(aref (process-get proc 'socks-scratch) 1))
|
||
(process-put proc 'socks-state socks-state-authenticated)))
|
||
|
||
(defun socks-username/password-auth (proc)
|
||
(let ((state (process-get proc 'socks-state)))
|
||
(if (not socks-password)
|
||
(setq socks-password (read-passwd
|
||
(format "Password for %s@%s: "
|
||
socks-username
|
||
(process-get proc 'socks-server-name)))))
|
||
(process-put proc 'socks-scratch "")
|
||
(set-process-filter proc #'socks-username/password-auth-filter)
|
||
(process-send-string proc
|
||
(format "%c%c%s%c%s"
|
||
socks-username/password-auth-version
|
||
(length socks-username)
|
||
socks-username
|
||
(length socks-password)
|
||
socks-password))
|
||
(socks-wait-for-state-change proc state)
|
||
(= (process-get proc 'socks-password-auth-status) 0)))
|
||
|
||
|
||
;; More advanced GSS/API stuff, not yet implemented - volunteers?
|
||
;; (socks-register-authentication-method 1 "GSS/API" 'socks-gssapi-auth)
|
||
|
||
(defun socks-gssapi-auth (_proc)
|
||
nil)
|
||
|
||
|
||
;; CHAP stuff
|
||
;; (socks-register-authentication-method 3 "CHAP" 'socks-chap-auth)
|
||
(defun socks-chap-auth (_proc)
|
||
nil)
|
||
|
||
|
||
;; CRAM stuff
|
||
;; (socks-register-authentication-method 5 "CRAM" 'socks-cram-auth)
|
||
(defun socks-cram-auth (_proc)
|
||
nil)
|
||
|
||
|
||
(defcustom socks-nslookup-program "nslookup"
|
||
"If non-nil then a string naming the nslookup program."
|
||
:type '(choice (const :tag "None" :value nil) string))
|
||
|
||
(defun socks-nslookup-host (host)
|
||
"Attempt to resolve the given HOSTNAME using nslookup if possible."
|
||
(interactive "sHost: ")
|
||
(if socks-nslookup-program
|
||
(let ((proc (start-process " *nslookup*" " *nslookup*"
|
||
socks-nslookup-program host))
|
||
(res host))
|
||
(set-process-query-on-exit-flag proc nil)
|
||
(with-current-buffer (process-buffer proc)
|
||
(while (progn
|
||
(accept-process-output proc)
|
||
(memq (process-status proc) '(run open))))
|
||
(goto-char (point-min))
|
||
(if (re-search-forward "Name:.*\nAddress\\(es\\)?: *\\([0-9.]+\\)$" nil t)
|
||
(progn
|
||
(setq res (buffer-substring (match-beginning 2)
|
||
(match-end 2))
|
||
res (mapcar #'string-to-number
|
||
(split-string res "\\.")))))
|
||
(kill-buffer (current-buffer)))
|
||
res)
|
||
host))
|
||
|
||
(provide 'socks)
|
||
|
||
;;; socks.el ends here
|