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Side by Side Diff: mojo/edk/system/simple_token_serializer_win.cc

Issue 1387963004: Create a broker interface for the new Mojo EDK so that the browser can create and duplicate messa... (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: presubmit whitespace error Created 5 years ago
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1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "mojo/edk/system/simple_token_serializer_win.h"
6
7 #include <windows.h>
8
9 #include "base/process/process.h"
10 #include "mojo/edk/embedder/platform_channel_pair.h"
11
12 namespace mojo {
13 namespace edk {
14
15 SimpleTokenSerializer::SimpleTokenSerializer() {
16 }
17
18 SimpleTokenSerializer::~SimpleTokenSerializer() {
19 }
20
21 void SimpleTokenSerializer::CreatePlatformChannelPair(
22 ScopedPlatformHandle* server, ScopedPlatformHandle* client) {
23 PlatformChannelPair channel_pair;
24 *server = channel_pair.PassServerHandle();
25 *client = channel_pair.PassClientHandle();
26 }
27
28 void SimpleTokenSerializer::HandleToToken(
29 const PlatformHandle* platform_handles,
30 size_t count,
31 uint64_t* tokens) {
32 // Since we're not sure which process might ultimately deserialize the message
33 // we can't duplicate the handle now. Instead, write the process ID and handle
34 // now and let the receiver duplicate it.
35 uint32_t current_process_id = base::GetCurrentProcId();
36 for (size_t i = 0; i < count; ++i) {
37 tokens[i] = current_process_id;
38 tokens[i] = tokens[i] << 32;
39 // Windows HANDLES are always 32 bit per
40 // https://msdn.microsoft.com/en-us/library/windows/desktop/aa384203(v=vs.85 ).aspx
41 #if defined(_WIN64)
42 tokens[i] |= static_cast<int32_t>(
43 reinterpret_cast<int64_t>(platform_handles[i].handle));
44 #else
45 tokens[i] |= reinterpret_cast<int32_t>(platform_handles[i].handle);
46 #endif
47 }
48 }
49
50 void SimpleTokenSerializer::TokenToHandle(const uint64_t* tokens,
51 size_t count,
52 PlatformHandle* handles) {
53 for (size_t i = 0; i < count; ++i) {
54 DWORD pid = tokens[i] >> 32;
55 #if defined(_WIN64)
56 // Sign-extend to preserve INVALID_HANDLE_VALUE.
57 HANDLE source_handle = reinterpret_cast<HANDLE>(
58 static_cast<int64_t>(static_cast<int32_t>(tokens[i] & 0xFFFFFFFF)));
59 #else
60 HANDLE source_handle = reinterpret_cast<HANDLE>(tokens[i] & 0xFFFFFFFF);
61 #endif
62 base::Process sender =
63 base::Process::OpenWithAccess(pid, PROCESS_DUP_HANDLE);
64 handles[i] = PlatformHandle();
65 if (!sender.IsValid()) {
66 // Sender died.
67 } else {
68 BOOL dup_result = DuplicateHandle(
69 sender.Handle(), source_handle,
70 base::GetCurrentProcessHandle(), &handles[i].handle, 0,
71 FALSE, DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);
72 DCHECK(dup_result);
73 }
74 }
75 }
76
77 } // namespace edk
78 } // namespace mojo
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