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 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/mojo_service_manager/connection.h"
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <cstdlib>
#include <string>
#include <utility>
#include "base/check_op.h"
#include "base/compiler_specific.h"
#include "base/functional/bind.h"
#include "base/metrics/histogram_functions.h"
#include "base/no_destructor.h"
#include "base/posix/eintr_wrapper.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "base/timer/elapsed_timer.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/platform/platform_channel.h"
#include "mojo/public/cpp/system/invitation.h"
namespace ash::mojo_service_manager {
namespace mojom = chromeos::mojo_service_manager::mojom;
namespace {
// The socket path to connect to the service manager.
constexpr char kServiceManagerSocketPath[] = "/run/mojo/service_manager.sock";
// The default mojo pipe name for bootstrap the mojo.
constexpr int kDefaultMojoInvitationPipeName = 0;
// The connection may fail if the socket is not exist or the permission is not
// set to the right permission. This could happen if the ChromeOS mojo service
// manager is starting. We may need to wait for a while and retry.
//
// TODO(b/234318452): Clean up this retry logic after we collect enough UMA
// data.
//
// The retry interval of connecting to the service manager. It is expected that
// normally the first retry should be able to perform the bootstrap on all
// devices.
constexpr base::TimeDelta kRetryInterval = base::Milliseconds(1);
// The retry timeout of connecting to the service manager.
constexpr base::TimeDelta kRetryTimeout = base::Seconds(5);
base::ScopedFD ConnectToServiceManagerUnixSocket() {
base::ScopedFD sock{socket(AF_UNIX, SOCK_STREAM, 0)};
if (!sock.is_valid()) {
PLOG(ERROR) << "Failed to create socket.";
return base::ScopedFD{};
}
struct sockaddr_un unix_addr {
.sun_family = AF_UNIX,
};
static_assert(sizeof(kServiceManagerSocketPath) <=
sizeof(unix_addr.sun_path));
UNSAFE_TODO(strncpy(unix_addr.sun_path, kServiceManagerSocketPath,
sizeof(kServiceManagerSocketPath)));
int rc = HANDLE_EINTR(connect(sock.get(),
reinterpret_cast<const sockaddr*>(&unix_addr),
sizeof(unix_addr)));
if (rc == -1 && errno != EISCONN) {
PLOG(ERROR) << "Failed to connect to service manager unix socket.";
return base::ScopedFD{};
}
return sock;
}
mojo::PendingRemote<mojom::ServiceManager> ConnectToMojoServiceManager() {
base::ScopedFD sock = ConnectToServiceManagerUnixSocket();
if (!sock.is_valid())
return mojo::PendingRemote<mojom::ServiceManager>{};
auto invitation = mojo::IncomingInvitation::Accept(
mojo::PlatformChannelEndpoint(mojo::PlatformHandle(std::move(sock))));
mojo::ScopedMessagePipeHandle pipe =
invitation.ExtractMessagePipe(kDefaultMojoInvitationPipeName);
return mojo::PendingRemote<mojom::ServiceManager>(std::move(pipe), 0u);
}
mojo::Remote<mojom::ServiceManager>& GetRemote() {
static base::NoDestructor<mojo::Remote<mojom::ServiceManager>> instance;
return *instance;
}
// Sends the histogram to record the retry times of bootstrap.
void SendBootsrapRetryTimesHistogram(int retry_times) {
// Note that sample will be 0 if didn't retry, and it will be in the underflow
// bucket.
base::UmaHistogramCustomCounts("Ash.MojoServiceManager.BootstrapRetryTimes",
retry_times, 1, 5000, 50);
}
// Sends the histogram to record whether the connection is lost during ash
// running.
void SendIsConnectionLostHistogram(bool is_connection_lost) {
base::UmaHistogramBoolean("Ash.MojoServiceManager.IsConnectionLost",
is_connection_lost);
}
void OnDisconnect(uint32_t reason, const std::string& message) {
SendIsConnectionLostHistogram(true);
LOG(FATAL) << "Disconnecting from ChromeOS mojo service manager is "
"unexpected. Reason: "
<< reason << ", message: " << message;
}
} // namespace
bool BootstrapServiceManagerConnection() {
CHECK(!GetRemote().is_bound()) << "remote_ has already bound.";
// We block and sleep here because we assume that it doesn't need to retry at
// all.
int retry_times = 0;
for (base::ElapsedTimer timer; timer.Elapsed() < kRetryTimeout;
base::PlatformThread::Sleep(kRetryInterval), ++retry_times) {
mojo::PendingRemote<mojom::ServiceManager> remote =
ConnectToMojoServiceManager();
if (!remote.is_valid())
continue;
SendBootsrapRetryTimesHistogram(retry_times);
GetRemote().Bind(std::move(remote));
GetRemote().set_disconnect_with_reason_handler(
base::BindOnce(&OnDisconnect));
return true;
}
SendBootsrapRetryTimesHistogram(retry_times);
return false;
}
bool IsServiceManagerBound() {
return GetRemote().is_bound();
}
void ResetServiceManagerConnection() {
SendIsConnectionLostHistogram(false);
GetRemote().reset();
}
mojom::ServiceManagerProxy* GetServiceManagerProxy() {
return GetRemote().get();
}
void SetServiceManagerRemoteForTesting( // IN-TEST
mojo::PendingRemote<mojom::ServiceManager> remote) {
CHECK(remote.is_valid());
GetRemote().Bind(std::move(remote));
GetRemote().set_disconnect_with_reason_handler(base::BindOnce(&OnDisconnect));
}
mojo::PendingReceiver<chromeos::mojo_service_manager::mojom::ServiceManager>
BootstrapServiceManagerInUtilityProcess() {
return GetRemote().BindNewPipeAndPassReceiver();
}
} // namespace ash::mojo_service_manager
|
