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|
#!@GUILE@ \
--debug -e main
# aside from this initial boilerplate, this is actually -*- scheme -*- code
!#
;;; client.scm -- Echo client example.
;; Copyright (C) 2014, 2015 Artyom V. Poptsov <poptsov.artyom@gmail.com>
;;
;; This program 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.
;;
;; This program 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 this program. If not, see
;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Echo client example.
;;
;; Usage: client.scm [ options ] <host> <string>
;;
;; Options:
;; --user=<user>, -u <user> User name
;; --port=<port-number>, -p <port-number> Port number
;; --identity-file=<file>, -i <file> Path to private key
;;
;; Examples:
;; $ ./client.scm -i ~/.ssh/id_rsa -p 12345 127.0.0.1 "`date`"
;;; Code:
(use-modules (ice-9 getopt-long)
(ice-9 rdelim)
(ssh channel)
(ssh session)
(ssh auth)
(ssh key))
(define *program-name* "client.scm")
(define *default-identity-file* (format #f "~a/.ssh/id_rsa" (getenv "HOME")))
(define *default-user* (getenv "USER"))
(define *default-port* "22")
;; Command line options
(define *option-spec*
'((user (single-char #\u) (value #t))
(port (single-char #\p) (value #t))
(identity-file (single-char #\i) (value #t))
(help (single-char #\h) (value #f))))
(define (print-help-and-exit)
"Print information about program usage."
(display (string-append "\
" *program-name* " -- Echo client example.
Copyright (C) Artyom V. Poptsov <poptsov.artyom@gmail.com>
Licensed under GNU GPLv3+
Usage: " *program-name* " [ options ] <host> <string>
Options:
--user=<user>, -u <user> User name
--port=<port-number>, -p <port-number> Port number
--identity-file=<file>, -i <file> Path to private key
"))
(exit 0))
(define (handle-error session)
"Handle a SSH error."
(display (get-error session))
(newline)
(exit 1))
(define (get-prvkey session identity-file)
"Get a private SSH key. Handle possible errors."
(let ((prvkey (private-key-from-file identity-file)))
(or prvkey
(handle-error session))
prvkey))
(define (read-all port)
"Read all lines from the PORT."
(let r ((res (read-line port 'concat))
(str ""))
(if (not (eof-object? str))
(r (string-append res str) (read-line port 'concat))
res)))
(define (main args)
"Entry point of the program."
(let* ((options (getopt-long args *option-spec*))
(user (option-ref options 'user *default-user*))
(port (option-ref options 'port *default-port*))
(identity-file (option-ref options 'identity-file
*default-identity-file*))
(help-needed? (option-ref options 'help #f))
(args (option-ref options '() #f)))
(and (or (null? args) help-needed?)
(print-help-and-exit))
(let* ((host (car args))
(str (cadr args))
(session (make-session #:user user
#:host host
#:port (string->number port)
#:log-verbosity 'nolog))) ;Be quiet
(connect! session)
(case (authenticate-server session)
((not-known)
(let* ((pubkey (get-server-public-key session))
(hash (get-public-key-hash pubkey 'md5)))
(display "The server is unknown. Please check MD5 sum:\n")
(format #t " ~a~%" (bytevector->hex-string hash)))))
(let ((private-key (get-prvkey session identity-file)))
(and (eqv? (userauth-public-key! session private-key) 'error)
(handle-error session))
(let ((channel (make-channel session)))
(or channel
(handle-error session))
(channel-open-session channel)
(write-line str channel)
(let poll ((ready? #f))
(if ready?
(format #t "Response from server: ~a~%" (read-all channel))
(poll (char-ready? channel))))
(close channel))))))
;;; echo.scm ends here.
|
