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;;;; 00-repl-server.test --- REPL server. -*- mode: scheme; coding: utf-8; -*-
;;;;
;;;; Copyright (C) 2016, 2017, 2021 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
(define-module (repl-server)
#:use-module (system repl server)
#:use-module (ice-9 match)
#:use-module (ice-9 rdelim)
#:use-module (web uri)
#:use-module (web request)
#:use-module (test-suite lib))
(define (call-with-repl-server proc)
"Set up a REPL server in a separate process and call PROC with a
socket connected to that server."
;; The REPL server requires thread. The test requires fork.
(unless (and (provided? 'threads) (provided? 'fork) (defined? 'mkdtemp))
(throw 'unsupported))
(let* ((tmpdir (mkdtemp "/tmp/repl-server-test-XXXXXX"))
(sockaddr (make-socket-address AF_UNIX (string-append tmpdir "/repl-server")))
(client-socket (socket AF_UNIX SOCK_STREAM 0)))
(false-if-exception (delete-file (sockaddr:path sockaddr)))
(match (primitive-fork)
(0
(dynamic-wind
(const #t)
(lambda ()
(let ((server-socket (socket AF_UNIX SOCK_STREAM 0)))
(bind server-socket sockaddr)
(set! %load-verbosely #f)
(close-fdes 2)
;; Arrange so that the alarming "possible break-in attempt"
;; message doesn't show up when running the test suite.
(dup2 (open-fdes "/dev/null" O_WRONLY) 2)
(run-server server-socket)))
(lambda ()
(primitive-exit 0))))
(pid
(sigaction SIGPIPE SIG_IGN)
(dynamic-wind
(const #t)
(lambda ()
;; XXX: We can't synchronize with the server's 'accept' call
;; because it's buried inside 'run-server', hence this hack.
(let loop ((tries 0))
(catch 'system-error
(lambda ()
(connect client-socket sockaddr))
(lambda args
(when (memv (system-error-errno args)
(list ENOENT ECONNREFUSED))
(when (> tries 30)
(throw 'unresolved))
(usleep 100)
(loop (+ tries 1))))))
(proc client-socket))
(lambda ()
(false-if-exception (close-port client-socket))
(false-if-exception (kill pid SIGTERM))
(false-if-exception (delete-file (sockaddr:path sockaddr)))
(false-if-exception (rmdir tmpdir))
(sigaction SIGPIPE SIG_DFL)))))))
(define-syntax-rule (with-repl-server client-socket body ...)
"Evaluate BODY... in a context where CLIENT-SOCKET is bound to a
socket connected to a fresh REPL server."
(call-with-repl-server
(lambda (client-socket)
body ...)))
(define (read-until-prompt port str)
"Read from PORT until STR has been read or the end-of-file was
reached."
(let loop ()
(match (read-line port)
((? eof-object?)
#t)
(line
(or (string=? line str) (loop))))))
(define %last-line-before-prompt
"Enter `,help' for help.")
;;; REPL server tests.
;;;
;;; Since we call 'primitive-fork', these tests must run before any
;;; tests that create threads.
(with-test-prefix "repl-server"
(pass-if-equal "simple expression"
"scheme@(repl-server)> $1 = 42\n"
(with-repl-server socket
(read-until-prompt socket %last-line-before-prompt)
;; Wait until 'repl-reader' in boot-9 has written the prompt.
;; Otherwise, if we write too quickly, 'repl-reader' checks for
;; 'char-ready?' and doesn't print the prompt.
(match (select (list socket) '() (list socket) 3)
(((_) () ())
(display "(+ 40 2)\n(quit)\n" socket)
(read-string socket)))))
(pass-if "HTTP inter-protocol attack" ;CVE-2016-8606
(with-repl-server socket
;; Avoid SIGPIPE when the server closes the connection.
(sigaction SIGPIPE SIG_IGN)
(read-until-prompt socket %last-line-before-prompt)
;; Simulate an HTTP inter-protocol attack.
(write-request (build-request (string->uri "http://localhost"))
socket)
;; Make sure the server reacts by closing the connection. If it
;; fails to do that, this test hangs.
(catch 'system-error
(lambda ()
(let loop ((n 0))
(display "(+ 40 2)\n(quit)\n" socket) ;trigger EPIPE
(read-string socket)
(if (> n 5)
#f ;failure
(begin
(sleep 1)
(loop (+ 1 n))))))
(lambda args
(->bool (memv (system-error-errno args)
(list ECONNRESET EPIPE ECONNABORTED))))))))
;;; Local Variables:
;;; eval: (put 'with-repl-server 'scheme-indent-function 1)
;;; End:
|
