1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/sync_socket.h"
#include <limits.h>
#include <stdio.h>
#include <windows.h>
#include <sys/types.h>
#include "base/atomicops.h"
#include "base/logging.h"
namespace base {
namespace {
// This prefix used to be appended to pipe names for pipes
// created in CreatePair.
const wchar_t kPipePrefix[] = L"\\\\.\\pipe\\chrome.sync.";
const size_t kPipePrefixSize = arraysize(kPipePrefix);
const size_t kPathMax = 28; // print length of process id + pair count.
const size_t kPipePathMax = kPipePrefixSize + kPathMax + 1;
// To avoid users sending negative message lengths to Send/Receive
// we clamp message lengths, which are size_t, to no more than INT_MAX.
const size_t kMaxMessageLength = static_cast<size_t>(INT_MAX);
const int kOutBufferSize = 4096;
const int kInBufferSize = 4096;
const int kDefaultTimeoutMilliSeconds = 1000;
static const SyncSocket::Handle kInvalidHandle = INVALID_HANDLE_VALUE;
} // namespace
bool SyncSocket::CreatePair(SyncSocket* pair[2]) {
Handle handles[2];
SyncSocket* tmp_sockets[2];
// Create the two SyncSocket objects first to avoid ugly cleanup issues.
tmp_sockets[0] = new SyncSocket(kInvalidHandle);
if (tmp_sockets[0] == NULL) {
return false;
}
tmp_sockets[1] = new SyncSocket(kInvalidHandle);
if (tmp_sockets[1] == NULL) {
delete tmp_sockets[0];
return false;
}
wchar_t name[kPipePathMax];
do {
unsigned int rnd_name;
if (rand_s(&rnd_name) != 0)
return false;
swprintf(name, kPipePathMax, L"%s%u.%lu",
kPipePrefix, GetCurrentProcessId(),
rnd_name);
handles[0] = CreateNamedPipeW(
name,
PIPE_ACCESS_DUPLEX | FILE_FLAG_FIRST_PIPE_INSTANCE,
PIPE_TYPE_BYTE | PIPE_READMODE_BYTE,
1,
kOutBufferSize,
kInBufferSize,
kDefaultTimeoutMilliSeconds,
NULL);
if (handles[0] == INVALID_HANDLE_VALUE &&
GetLastError() != ERROR_ACCESS_DENIED &&
GetLastError() != ERROR_PIPE_BUSY) {
return false;
}
} while (handles[0] == INVALID_HANDLE_VALUE);
handles[1] = CreateFileW(name,
GENERIC_READ | GENERIC_WRITE,
0, // no sharing.
NULL, // default security attributes.
OPEN_EXISTING, // opens existing pipe.
SECURITY_SQOS_PRESENT | SECURITY_ANONYMOUS,
// no impersonation.
NULL); // no template file.
if (handles[1] == INVALID_HANDLE_VALUE) {
CloseHandle(handles[0]);
return false;
}
if (ConnectNamedPipe(handles[0], NULL) == FALSE) {
DWORD error = GetLastError();
if (error != ERROR_PIPE_CONNECTED) {
CloseHandle(handles[0]);
CloseHandle(handles[1]);
return false;
}
}
// Copy the handles out for successful return.
tmp_sockets[0]->handle_ = handles[0];
pair[0] = tmp_sockets[0];
tmp_sockets[1]->handle_ = handles[1];
pair[1] = tmp_sockets[1];
return true;
}
bool SyncSocket::Close() {
if (handle_ == kInvalidHandle) {
return false;
}
BOOL retval = CloseHandle(handle_);
handle_ = kInvalidHandle;
return retval ? true : false;
}
size_t SyncSocket::Send(const void* buffer, size_t length) {
DCHECK(length <= kMaxMessageLength);
size_t count = 0;
while (count < length) {
DWORD len;
// The following statement is for 64 bit portability.
DWORD chunk = static_cast<DWORD>(
((length - count) <= UINT_MAX) ? (length - count) : UINT_MAX);
if (WriteFile(handle_, static_cast<const char*>(buffer) + count,
chunk, &len, NULL) == FALSE) {
return (0 < count) ? count : 0;
}
count += len;
}
return count;
}
size_t SyncSocket::Receive(void* buffer, size_t length) {
DCHECK(length <= kMaxMessageLength);
size_t count = 0;
while (count < length) {
DWORD len;
DWORD chunk = static_cast<DWORD>(
((length - count) <= UINT_MAX) ? (length - count) : UINT_MAX);
if (ReadFile(handle_, static_cast<char*>(buffer) + count,
chunk, &len, NULL) == FALSE) {
return (0 < count) ? count : 0;
}
count += len;
}
return count;
}
size_t SyncSocket::Peek() {
DWORD available = 0;
PeekNamedPipe(handle_, NULL, 0, NULL, &available, NULL);
return available;
}
} // namespace base
|
