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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
//
// Copyright 2017 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "h4_packetizer.h"
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/uio.h>
#include <unistd.h>
#include "os/log.h"
namespace test_vendor_lib {
namespace hci {
constexpr size_t H4Packetizer::COMMAND_PREAMBLE_SIZE;
constexpr size_t H4Packetizer::COMMAND_LENGTH_OFFSET;
constexpr size_t H4Packetizer::ACL_PREAMBLE_SIZE;
constexpr size_t H4Packetizer::ACL_LENGTH_OFFSET;
constexpr size_t H4Packetizer::SCO_PREAMBLE_SIZE;
constexpr size_t H4Packetizer::SCO_LENGTH_OFFSET;
constexpr size_t H4Packetizer::EVENT_PREAMBLE_SIZE;
constexpr size_t H4Packetizer::EVENT_LENGTH_OFFSET;
constexpr size_t H4Packetizer::PREAMBLE_SIZE_MAX;
size_t H4Packetizer::HciGetPacketLengthForType(hci::PacketType type, const uint8_t* preamble) {
static const size_t packet_length_offset[static_cast<size_t>(hci::PacketType::EVENT) + 1] = {
0,
H4Packetizer::COMMAND_LENGTH_OFFSET,
H4Packetizer::ACL_LENGTH_OFFSET,
H4Packetizer::SCO_LENGTH_OFFSET,
H4Packetizer::EVENT_LENGTH_OFFSET,
};
size_t offset = packet_length_offset[static_cast<size_t>(type)];
if (type != hci::PacketType::ACL) return preamble[offset];
return (((preamble[offset + 1]) << 8) | preamble[offset]);
}
H4Packetizer::H4Packetizer(int fd, PacketReadCallback command_cb, PacketReadCallback event_cb,
PacketReadCallback acl_cb, PacketReadCallback sco_cb, ClientDisconnectCallback disconnect_cb)
: uart_fd_(fd), command_cb_(command_cb), event_cb_(event_cb), acl_cb_(acl_cb), sco_cb_(sco_cb),
disconnect_cb_(disconnect_cb) {}
size_t H4Packetizer::Send(uint8_t type, const uint8_t* data, size_t length) {
struct iovec iov[] = {{&type, sizeof(type)}, {const_cast<uint8_t*>(data), length}};
ssize_t ret = 0;
do {
ret = TEMP_FAILURE_RETRY(writev(uart_fd_, iov, sizeof(iov) / sizeof(iov[0])));
} while (-1 == ret && EAGAIN == errno);
if (ret == -1) {
LOG_ERROR("%s error writing to UART (%s)", __func__, strerror(errno));
} else if (ret < static_cast<ssize_t>(length + 1)) {
LOG_ERROR("%s: %d / %d bytes written - something went wrong...", __func__, static_cast<int>(ret),
static_cast<int>(length + 1));
}
return ret;
}
void H4Packetizer::OnPacketReady() {
switch (hci_packet_type_) {
case hci::PacketType::COMMAND:
command_cb_(packet_);
break;
case hci::PacketType::ACL:
acl_cb_(packet_);
break;
case hci::PacketType::SCO:
sco_cb_(packet_);
break;
case hci::PacketType::EVENT:
event_cb_(packet_);
break;
default:
LOG_ALWAYS_FATAL("%s: Unimplemented packet type %d", __func__, static_cast<int>(hci_packet_type_));
}
// Get ready for the next type byte.
hci_packet_type_ = hci::PacketType::UNKNOWN;
}
void H4Packetizer::OnDataReady(int fd) {
if (hci_packet_type_ == hci::PacketType::UNKNOWN) {
uint8_t buffer[1] = {0};
ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer, 1));
if (bytes_read == 0) {
LOG_INFO("%s: remote disconnected!", __func__);
disconnect_cb_();
return;
} else if (bytes_read < 0) {
if (errno == EAGAIN) {
// No data, try again later.
return;
} else if (errno == ECONNRESET) {
// They probably rejected our packet
return;
} else {
LOG_ALWAYS_FATAL("%s: Read packet type error: %s", __func__, strerror(errno));
}
} else if (bytes_read > 1) {
LOG_ALWAYS_FATAL("%s: More bytes read than expected (%u)!", __func__, static_cast<unsigned int>(bytes_read));
}
hci_packet_type_ = static_cast<hci::PacketType>(buffer[0]);
if (hci_packet_type_ != hci::PacketType::ACL && hci_packet_type_ != hci::PacketType::SCO &&
hci_packet_type_ != hci::PacketType::COMMAND && hci_packet_type_ != hci::PacketType::EVENT) {
LOG_ALWAYS_FATAL("%s: Unimplemented packet type %d", __func__, static_cast<int>(hci_packet_type_));
}
} else {
static const size_t preamble_size[static_cast<size_t>(hci::PacketType::EVENT) + 1] = {
0,
H4Packetizer::COMMAND_PREAMBLE_SIZE,
H4Packetizer::ACL_PREAMBLE_SIZE,
H4Packetizer::SCO_PREAMBLE_SIZE,
H4Packetizer::EVENT_PREAMBLE_SIZE,
};
switch (state_) {
case HCI_PREAMBLE: {
size_t preamble_bytes = preamble_size[static_cast<size_t>(hci_packet_type_)];
ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, preamble_ + bytes_read_, preamble_bytes - bytes_read_));
if (bytes_read == 0) {
LOG_ERROR("%s: Will try again to read the header!", __func__);
return;
}
if (bytes_read < 0) {
// Ignore temporary failures.
if (errno == EAGAIN) {
return;
}
LOG_ALWAYS_FATAL("%s: Read header error: %s", __func__, strerror(errno));
}
bytes_read_ += bytes_read;
if (bytes_read_ == preamble_bytes) {
size_t packet_length = HciGetPacketLengthForType(hci_packet_type_, preamble_);
packet_.resize(preamble_bytes + packet_length);
memcpy(packet_.data(), preamble_, preamble_bytes);
bytes_remaining_ = packet_length;
if (bytes_remaining_ == 0) {
OnPacketReady();
state_ = HCI_PREAMBLE;
bytes_read_ = 0;
} else {
state_ = HCI_PAYLOAD;
bytes_read_ = 0;
}
}
break;
}
case HCI_PAYLOAD: {
size_t preamble_bytes = preamble_size[static_cast<size_t>(hci_packet_type_)];
ssize_t bytes_read =
TEMP_FAILURE_RETRY(read(fd, packet_.data() + preamble_bytes + bytes_read_, bytes_remaining_));
if (bytes_read == 0) {
LOG_INFO("%s: Will try again to read the payload!", __func__);
return;
}
if (bytes_read < 0) {
// Ignore temporary failures.
if (errno == EAGAIN) {
return;
}
LOG_ALWAYS_FATAL("%s: Read payload error: %s", __func__, strerror(errno));
}
bytes_remaining_ -= bytes_read;
bytes_read_ += bytes_read;
if (bytes_remaining_ == 0) {
OnPacketReady();
state_ = HCI_PREAMBLE;
bytes_read_ = 0;
}
break;
}
}
}
}
} // namespace hci
} // namespace test_vendor_lib
|
