1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "CookieStorageShimLibrary.h"
28
29#if ENABLE(NETWORK_PROCESS) && !PLATFORM(IOS)
30
31#include <WebCore/DynamicLinkerInterposing.h>
32
33extern "C" CFDictionaryRef _CFHTTPCookieStorageCopyRequestHeaderFieldsForURL(CFAllocatorRef inAllocator, CFHTTPCookieStorageRef inCookieStorage, CFURLRef inRequestURL);
34
35namespace WebKit {
36
37extern "C" void WebKitCookieStorageShimInitialize(const CookieStorageShimCallbacks&);
38
39static CookieStorageShimCallbacks cookieStorageShimCallbacks;
40
41class ShimProtector {
42public:
43    ShimProtector() { ++m_count; }
44    ~ShimProtector() { --m_count; }
45    static unsigned count() { return m_count; }
46private:
47    __thread static unsigned m_count;
48};
49
50__thread unsigned ShimProtector::m_count = 0;
51
52static CFDictionaryRef shimCFHTTPCookieStorageCopyRequestHeaderFieldsForURL(CFAllocatorRef inAllocator, CFHTTPCookieStorageRef inCookieStorage, CFURLRef inRequestURL)
53{
54    ShimProtector protector;
55
56    do {
57        // Protect against uninitialized callbacks:
58        if (!cookieStorageShimCallbacks.cookieStorageCopyRequestHeaderFieldsForURL)
59            break;
60
61        // Protect against accidental recursion:
62        if (ShimProtector::count() > 1)
63            break;
64
65        CFDictionaryRef results = cookieStorageShimCallbacks.cookieStorageCopyRequestHeaderFieldsForURL(inCookieStorage, inRequestURL);
66        if (!results)
67            break;
68
69        return results;
70    } while (0);
71
72    // If we've failed to retrieve the cookies manually, fall back to the original imposed function:
73    return _CFHTTPCookieStorageCopyRequestHeaderFieldsForURL(inAllocator, inCookieStorage, inRequestURL);
74}
75
76DYLD_INTERPOSE(shimCFHTTPCookieStorageCopyRequestHeaderFieldsForURL, _CFHTTPCookieStorageCopyRequestHeaderFieldsForURL);
77
78__attribute__((visibility("default")))
79void WebKitCookieStorageShimInitialize(const CookieStorageShimCallbacks& callbacks)
80{
81    // Because the value of cookieStorageShimCallbacks will be read from mulitple threads,
82    // only allow it to be initialized once.
83    static int initialized = 0;
84    if (!OSAtomicCompareAndSwapInt(0, 1, &initialized)) {
85        return;
86    }
87
88    cookieStorageShimCallbacks = callbacks;
89}
90
91}
92
93#endif // ENABLE(NETWORK_PROCESS) && !PLATFORM(IOS)
94