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|
#!@GUILE@ \
--debug -e main
!#
;;; sscp.scm -- Scheme Secure Copy implementation.
;; Copyright (C) 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:
;; Somewhat a minimal implementation of scp (Secure Copy) in Scheme that is
;; aimed to show how one could use (ssh sftp) module from Guile-SSH to do such
;; a work.
;;; Code:
(use-modules (ice-9 regex) ; 'make-regexp' etc
(ice-9 rdelim) ; 'read-line', 'write-line'
(ice-9 getopt-long) ; CLI options parsing
;; Guile-SSH modules
(ssh session) ; Guile-SSH sessions
(ssh auth) ; Authentication
(ssh sftp)) ; SFTP client API
(define (debug fmt . args)
(format #t "DEBUG: ~a~%" (apply format #f fmt args)))
(define (print-help-and-exit)
(display "
Usage: sscp source dest
Example:
sscp avp@127.0.0.1:/etc/profile profile
")
(exit 0))
(define %remote-regex
(make-regexp "(.*)@([0-9]+\\.[0-9]+\\.[0-9]\\.[0-9]+):(.*)"))
(define (cp user host path destination)
"Copy a file specified by a PATH from HOST to a local DESTINATION."
(let ((session (make-session #:user user #:host host)))
(connect! session)
(userauth-agent! session)
(let ((sftp-session (make-sftp-session session)))
(let ((remote-file (sftp-open sftp-session path O_RDONLY))
(local-file (open-output-file destination)))
(let copy ((line (read-line remote-file)))
(unless (eof-object? line)
(write-line line local-file)
(copy (read-line remote-file))))))))
(define (main args)
"Entry point."
(let* ((option-spec '((help (single-char #\h) (value #f))))
(options (getopt-long args option-spec))
(help-needed? (option-ref options 'help #f))
(args (option-ref options '() #f)))
(and help-needed?
(print-help-and-exit))
(debug "program args: ~a" args)
(let* ((source (car args))
(destination (cadr args)))
(debug "source: ~a; dest: ~a" source destination)
(cond
((regexp-exec %remote-regex source) =>
(lambda (match)
(let ((user (match:substring match 1))
(host (match:substring match 2))
(path (match:substring match 3)))
(debug "user: ~a; host: ~a; path: ~a" user host path)
(cp user host path destination))))
(else
(error "Not supported yet. :-/" args))))))
;;; sscp.scm ends here.
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