This is xnu-8019. See this file in:
/*
 * Copyright (c) 2009 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#include <stdio.h>

#include <CoreFoundation/CoreFoundation.h>

#include <kxld.h>

#define kCFBundleGetInfoStringKey CFSTR("CFBundleGetInfoString")
#define kNSHumanReadableCopyrightKey CFSTR("NSHumanReadableCopyright")

const char *gProgname = NULL;

static void usage(void);
static void printFormat(void);
static char *convert_cfstring(CFStringRef the_string);

/******************************************************************************
******************************************************************************/
static void
usage(void)
{
	printf("usage: %s [path to kext]\n\n"
	    "This program validates the copyright string in a kext's info "
	    "dictionary.\n\n", gProgname);

	printFormat();
}

/******************************************************************************
******************************************************************************/
static void
printFormat(void)
{
	fprintf(stderr,
	    "The copyright string should be contained in the NSHumanReadableCopyright key.\n"
	    "It should be of the format:\n"
	    "\tCopyright © [year(s) of publication] Apple Inc. All rights reserved.\n\n"
	    "where [year(s) of publication] is a comma-separated list of years and/or\n"
	    "year ranges, e.g., 2004, 2006-2008.  Years must be four digits.  Year ranges\n"
	    "may not contain spaces and must use four digits for both years.\n\n"
	    "The following are examples of valid copyright strings:\n"
	    "\tCopyright © 2008 Apple Inc. All rights reserved.\n"
	    "\tCopyright © 2004-2008 Apple Inc. All rights reserved.\n"
	    "\tCopyright © 1998,2000-2002,2004,2006-2008 Apple Inc. All rights reserved.\n");
}

/******************************************************************************
******************************************************************************/
char *
convert_cfstring(CFStringRef the_string)
{
	char *result = NULL;
	CFDataRef the_data = NULL;
	const UInt8 *data_bytes = NULL;
	char *converted_string = NULL;
	u_long converted_len = 0;
	u_long bytes_copied = 0;

	the_data = CFStringCreateExternalRepresentation(kCFAllocatorDefault,
	    the_string, kCFStringEncodingUTF8, 0);
	if (!the_data) {
		fprintf(stderr, "Failed to convert string\n");
		goto finish;
	}

	data_bytes = CFDataGetBytePtr(the_data);
	if (!data_bytes) {
		fprintf(stderr, "Failed to get converted string bytes\n");
		goto finish;
	}

	converted_len = strlen((const char *)data_bytes) + 1; // +1 for nul
	converted_string = malloc(converted_len);
	if (!converted_string) {
		fprintf(stderr, "Failed to allocate memory\n");
		goto finish;
	}

	bytes_copied = strlcpy(converted_string, (const char *) data_bytes,
	    converted_len) + 1; // +1 for nul
	if (bytes_copied != converted_len) {
		fprintf(stderr, "Failed to copy converted string\n");
		goto finish;
	}

	result = converted_string;
finish:
	if (the_data) {
		CFRelease(the_data);
	}
	return result;
}

/******************************************************************************
******************************************************************************/
int
main(int argc, const char *argv[])
{
	int result = 1;
	boolean_t infoCopyrightIsValid = false;
	boolean_t readableCopyrightIsValid = false;
	CFURLRef anURL = NULL;                  // must release
	CFBundleRef aBundle = NULL;             // must release
	CFDictionaryRef aDict = NULL;           // do not release
	CFStringRef infoCopyrightString = NULL; // do not release
	CFStringRef readableCopyrightString = NULL; // do not release
	char *infoStr = NULL;                   // must free
	char *readableStr = NULL;               // must free

	gProgname = argv[0];

	if (argc != 2) {
		usage();
		goto finish;
	}

	anURL = CFURLCreateFromFileSystemRepresentation(kCFAllocatorDefault,
	    (const UInt8 *) argv[1], strlen(argv[1]), /* isDirectory */ FALSE);
	if (!anURL) {
		fprintf(stderr, "Can't create path from %s\n", argv[1]);
		goto finish;
	}

	aBundle = CFBundleCreate(kCFAllocatorDefault, anURL);
	if (!aBundle) {
		fprintf(stderr, "Can't create bundle at path %s\n", argv[1]);
		goto finish;
	}

	aDict = CFBundleGetInfoDictionary(aBundle);
	if (!aDict) {
		fprintf(stderr, "Can't get info dictionary from bundle\n");
		goto finish;
	}

	infoCopyrightString = CFDictionaryGetValue(aDict, kCFBundleGetInfoStringKey);
	readableCopyrightString = CFDictionaryGetValue(aDict, kNSHumanReadableCopyrightKey);

	if (!infoCopyrightString && !readableCopyrightString) {
		fprintf(stderr, "This kext does not have a value for NSHumanReadableCopyright");
		goto finish;
	}

	if (infoCopyrightString) {
		fprintf(stderr, "Warning: This kext has a value for CFBundleGetInfoString.\n"
		    "This key is obsolete, and may be removed from the kext's Info.plist.\n"
		    "It has been replaced by CFBundleVersion and NSHumanReadableCopyright.\n\n");

		infoStr = convert_cfstring(infoCopyrightString);
		if (!infoStr) {
			goto finish;
		}

		infoCopyrightIsValid = kxld_validate_copyright_string(infoStr);
	}

	if (readableCopyrightString) {
		readableStr = convert_cfstring(readableCopyrightString);
		if (!readableStr) {
			goto finish;
		}

		readableCopyrightIsValid = kxld_validate_copyright_string(readableStr);
	}

	if (!readableCopyrightIsValid) {
		if (infoCopyrightIsValid) {
			fprintf(stderr, "Warning: The copyright string in NSHumanReadableCopyright is invalid,\n"
			    "but the string in CFBundleGetInfoString is valid.  CFBundleGetInfoString is\n"
			    "obsolete.  Please migrate your copyright string to NSHumanReadableCopyright.\n\n");
		} else {
			fprintf(stderr, "Error: There is no valid copyright string for this kext.\n\n");
			printFormat();
			goto finish;
		}
	}

	result = 0;
finish:
	if (anURL) {
		CFRelease(anURL);
	}
	if (aBundle) {
		CFRelease(aBundle);
	}
	if (infoStr) {
		free(infoStr);
	}
	if (readableStr) {
		free(readableStr);
	}

	return result;
}