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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/IOBSD.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/storage/IOBlockStorageDevice.h>
#include <IOKit/storage/IOMedia.h>
#include <IOKit/storage/IOStorageProtocolCharacteristics.h>
#include <stddef.h>
#include <sys/socket.h>
#include <memory>
#include "base/apple/scoped_cftyperef.h"
#include "base/command_line.h"
#include "base/files/scoped_file.h"
#include "base/functional/bind.h"
#include "base/mac/scoped_ioobject.h"
#include "base/posix/eintr_wrapper.h"
#include "base/process/kill.h"
#include "base/process/launch.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/sys_string_conversions.h"
#include "chrome/common/extensions/image_writer/image_writer_util_mac.h"
#include "chrome/utility/image_writer/disk_unmounter_mac.h"
#include "chrome/utility/image_writer/error_message_strings.h"
#include "chrome/utility/image_writer/image_writer.h"
namespace image_writer {
static const char kAuthOpenPath[] = "/usr/libexec/authopen";
bool ImageWriter::IsValidDevice() {
base::apple::ScopedCFTypeRef<CFStringRef> cf_bsd_name(
base::SysUTF8ToCFStringRef(device_path_.value()));
base::apple::ScopedCFTypeRef<CFMutableDictionaryRef> matching(
IOServiceMatching(kIOMediaClass));
CFDictionaryAddValue(matching.get(), CFSTR(kIOMediaWholeKey), kCFBooleanTrue);
CFDictionaryAddValue(matching.get(), CFSTR(kIOMediaWritableKey),
kCFBooleanTrue);
CFDictionaryAddValue(matching.get(), CFSTR(kIOBSDNameKey), cf_bsd_name.get());
// IOServiceGetMatchingService consumes a reference to the matching dictionary
// passed to it.
base::mac::ScopedIOObject<io_service_t> disk_obj(
IOServiceGetMatchingService(kIOMainPortDefault, matching.release()));
if (!disk_obj)
return false;
return extensions::IsSuitableRemovableStorageDevice(disk_obj.get(), nullptr,
nullptr, nullptr);
}
void ImageWriter::UnmountVolumes(base::OnceClosure continuation) {
if (!unmounter_)
unmounter_ = std::make_unique<DiskUnmounterMac>();
unmounter_->Unmount(
device_path_.value(), std::move(continuation),
base::BindOnce(&ImageWriter::Error, base::Unretained(this),
error::kUnmountVolumes));
}
bool ImageWriter::OpenDevice() {
base::LaunchOptions options;
options.wait = false;
// Create a socket pair for communication.
int sockets[2];
int result = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
if (result == -1) {
PLOG(ERROR) << "Unable to allocate socket pair.";
return false;
}
base::ScopedFD parent_socket(sockets[0]);
base::ScopedFD child_socket(sockets[1]);
// Map the client socket to the client's STDOUT.
options.fds_to_remap.push_back(
std::pair<int, int>(child_socket.get(), STDOUT_FILENO));
// Find the file path to open.
base::FilePath real_device_path;
if (device_path_.IsAbsolute()) {
// This only occurs for tests where the device path is mocked with a
// temporary file.
real_device_path = device_path_;
} else {
// Get the raw device file. Writes need to be in multiples of
// DAMediaBlockSize (usually 512). This is fine since WriteChunk() writes in
// multiples of kMemoryAlignment.
real_device_path =
base::FilePath("/dev").Append("r" + device_path_.BaseName().value());
}
// Build the command line.
std::string rdwr = base::NumberToString(O_RDWR);
base::CommandLine cmd_line = base::CommandLine(base::FilePath(kAuthOpenPath));
cmd_line.AppendSwitch("-stdoutpipe");
// Using AppendSwitchNative will use an equal-symbol which we don't want.
cmd_line.AppendArg("-o");
cmd_line.AppendArg(rdwr);
cmd_line.AppendArgPath(real_device_path);
// Launch the process.
base::Process process = base::LaunchProcess(cmd_line, options);
if (!process.IsValid()) {
LOG(ERROR) << "Failed to launch authopen process.";
return false;
}
// Receive a file descriptor from authopen which sends a single FD via
// sendmsg and the SCM_RIGHTS extension.
int fd = -1;
const size_t kDataBufferSize = sizeof(struct cmsghdr) + sizeof(int);
char data_buffer[kDataBufferSize];
struct iovec io_vec[1];
io_vec[0].iov_base = data_buffer;
io_vec[0].iov_len = kDataBufferSize;
const socklen_t kCmsgSocketSize =
static_cast<socklen_t>(CMSG_SPACE(sizeof(int)));
char cmsg_socket[kCmsgSocketSize];
struct msghdr message = {0};
message.msg_iov = io_vec;
message.msg_iovlen = 1;
message.msg_control = cmsg_socket;
message.msg_controllen = kCmsgSocketSize;
ssize_t size = HANDLE_EINTR(recvmsg(parent_socket.get(), &message, 0));
if (size > 0) {
struct cmsghdr* cmsg_socket_header = CMSG_FIRSTHDR(&message);
if (cmsg_socket_header && cmsg_socket_header->cmsg_level == SOL_SOCKET &&
cmsg_socket_header->cmsg_type == SCM_RIGHTS) {
fd = *reinterpret_cast<int*>(CMSG_DATA(cmsg_socket_header));
}
}
device_file_ = base::File(fd);
// Wait for the child.
int child_exit_status;
if (!process.WaitForExit(&child_exit_status)) {
LOG(ERROR) << "Unable to wait for child.";
return false;
}
if (child_exit_status) {
LOG(ERROR) << "Child process returned failure.";
return false;
}
return device_file_.IsValid();
}
} // namespace image_writer
|
