Re: Race condition with SCardGetStatusChange() when USB Reader is removed

/*
 * MUSCLE SmartCard Development ( http://pcsclite.alioth.debian.org/pcsclite.html )
 *
 * Copyright (C) 1999
 *  David Corcoran <[email protected]>
 * Copyright (C) 2004-2010
 *  Ludovic Rousseau <[email protected]>
 *
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
   derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 * @brief This is a test program for pcsc-lite.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <pcsclite.h>
#include <winscard.h>

#define PANIC 0
#define DONT_PANIC 1

#define BLUE "\33[34m"
#define RED "\33[31m"
#define BRIGHT_RED "\33[01;31m"
#define GREEN "\33[32m"
#define NORMAL "\33[0m"
#define MAGENTA "\33[35m"

static void test_rv(LONG rv, SCARDCONTEXT hContext, int dont_panic)
{
	if (rv != SCARD_S_SUCCESS)
	{
		if (dont_panic)
			printf(BLUE "%s (don't panic)\n" NORMAL, pcsc_stringify_error(rv));
		else
		{
			printf(RED "%s\n" NORMAL, pcsc_stringify_error(rv));
			(void)SCardReleaseContext(hContext);
			exit(-1);
		}
	}
	else
		(void)puts(pcsc_stringify_error(rv));
}

int main(/*@unused@*/ int argc, /*@unused@*/ char **argv)
{
	SCARDHANDLE hCard;
	SCARDCONTEXT hContext;
	SCARD_READERSTATE rgReaderStates[2];
	DWORD dwReaderLen, dwState, dwProt, dwAtrLen;
	DWORD dwReaders = 0;
	char *mszReaders = NULL;
	unsigned char *pbAtr = NULL;
	char *mszGroups;
	long rv;
	DWORD i;
	int p, iReader;
	int iList[16] = {0};

	(void)argc;
	(void)argv;

	printf("\nTest race condition in SCardGetStatusChange on USB reader disconnect\n\n");

	printf("Testing SCardEstablishContext\t: ");
	rv = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL, &hContext);
	test_rv(rv, hContext, PANIC);

	printf("Testing SCardListReaders\t: ");
	mszGroups = NULL;
	dwReaders = SCARD_AUTOALLOCATE;
	rv = SCardListReaders(hContext, mszGroups, (LPSTR)&mszReaders, &dwReaders);
	test_rv(rv, hContext, DONT_PANIC);

	/*
	 * Have to understand the multi-string here
	 */
	p = 0;
	for (i = 0; i+1 < dwReaders; i++)
	{
		++p;
		printf(GREEN "Reader %02d: %s\n" NORMAL, p, &mszReaders[i]);
		iList[p] = i;
		while (mszReaders[++i] != 0) ;
	}

	if (p != 1) {
		printf(RED "Please connect exactly 1 reader\n" NORMAL);
		goto end;
	}


	/* Observe PnP Notification */
	rgReaderStates[0].szReader = "\\\\?PnP?\\Notification";
	rgReaderStates[0].dwCurrentState = SCARD_STATE_UNAWARE;

	/* Observe connected reader */
	rgReaderStates[1].szReader = &mszReaders[iList[0]];
	rgReaderStates[1].dwCurrentState = SCARD_STATE_UNKNOWN;

	printf("First SCardGetStatusChange to get reader state - expected to return\n");
	(void)fflush(stdout);
	rv = SCardGetStatusChange(hContext, INFINITE, rgReaderStates, 2);
	test_rv(rv, hContext, PANIC);

	printf(GREEN "Reader %s - event state: %08lX\n" NORMAL, rgReaderStates[0].szReader, rgReaderStates[0].dwEventState);
	printf(GREEN "Reader %s - event state: %08lX\n" NORMAL, rgReaderStates[1].szReader, rgReaderStates[1].dwEventState);

	rgReaderStates[0].dwCurrentState = SCARD_STATE_UNAWARE;
	rgReaderStates[1].dwCurrentState = rgReaderStates[1].dwEventState;
	rgReaderStates[1].dwEventState = 0;

	printf("Second SCardGetStatusChange waiting for reader disconnect - expected to block until timeout\n");
	(void)fflush(stdout);
	rv = SCardGetStatusChange(hContext, INFINITE, rgReaderStates, 2);
	test_rv(rv, hContext, PANIC);

	printf(GREEN "Reader %s - event state: %08lX\n" NORMAL, rgReaderStates[0].szReader, rgReaderStates[0].dwEventState);
	printf(GREEN "Reader %s - event state: %08lX\n" NORMAL, rgReaderStates[1].szReader, rgReaderStates[1].dwEventState);


end:
	printf("Testing SCardFreeMemory\t\t: ");
	rv = SCardFreeMemory(hContext, mszReaders);
	test_rv(rv, hContext, PANIC);

	printf("Testing SCardReleaseContext\t: ");
	rv = SCardReleaseContext(hContext);
	test_rv(rv, hContext, PANIC);

	return 0;
}