62 lines
2.1 KiB
Racket
62 lines
2.1 KiB
Racket
#lang racket/base
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;; Sandbox management and use.
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;;
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;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
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;;;
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;;; This file is part of marketplace-ssh.
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;;;
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;;; marketplace-ssh is free software: you can redistribute it and/or
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;;; modify it under the terms of the GNU General Public License as
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;;; published by the Free Software Foundation, either version 3 of the
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;;; License, or (at your option) any later version.
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;;;
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;;; marketplace-ssh is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with marketplace-ssh. If not, see
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;;; <http://www.gnu.org/licenses/>.
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(require racket/match)
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(require racket/sandbox)
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(provide repl-shell)
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(struct user-state (name master-sandbox master-namespace) #:transparent)
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(define *user-states* (make-hash))
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(define (get-user-state username)
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(when (not (hash-has-key? *user-states* username))
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(let* ((sb (make-evaluator 'racket/base))
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(ns (call-in-sandbox-context sb current-namespace)))
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(hash-set! *user-states* username
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(user-state username
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sb
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ns))))
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(hash-ref *user-states* username))
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(define (repl-shell username in out)
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(match-define (user-state _ master-sandbox master-namespace) (get-user-state username))
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(parameterize ((current-input-port in)
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(current-output-port out)
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(current-error-port out)
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(sandbox-input in)
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(sandbox-output out)
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(sandbox-error-output out)
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(sandbox-memory-limit 2) ;; megabytes
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(sandbox-eval-limits #f)
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(sandbox-namespace-specs (list (lambda () master-namespace))))
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(printf "Hello, ~a.\n" username)
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(define slave-sandbox (make-evaluator '(begin)))
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;; ^^ uses master-namespace via sandbox-namespace-specs
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(parameterize ((current-namespace master-namespace)
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(current-eval slave-sandbox))
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(read-eval-print-loop))
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(fprintf out "\nGoodbye!\n")
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(kill-evaluator slave-sandbox)
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(close-input-port in)
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(close-output-port out)))
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