1 /*
2 * Copyright 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "model/devices/link_layer_socket_device.h"
18
19 #include <packet_runtime.h>
20
21 #include <cerrno>
22 #include <cstdint>
23 #include <cstring>
24 #include <memory>
25 #include <utility>
26 #include <vector>
27
28 #include "log.h"
29 #include "model/devices/device.h"
30 #include "packets/link_layer_packets.h"
31 #include "phy.h"
32
33 using std::vector;
34
35 namespace rootcanal {
36
LinkLayerSocketDevice(std::shared_ptr<AsyncDataChannel> socket_fd,Phy::Type phy_type)37 LinkLayerSocketDevice::LinkLayerSocketDevice(std::shared_ptr<AsyncDataChannel> socket_fd,
38 Phy::Type phy_type)
39 : socket_(socket_fd),
40 phy_type_(phy_type),
41 size_bytes_(std::make_shared<std::vector<uint8_t>>(kSizeBytes)) {}
42
Tick()43 void LinkLayerSocketDevice::Tick() {
44 if (receiving_size_) {
45 ssize_t bytes_received = socket_->Recv(size_bytes_->data() + offset_, kSizeBytes);
46 if (bytes_received <= 0) {
47 if (errno == EAGAIN || errno == EWOULDBLOCK) {
48 // Nothing available yet.
49 // DEBUG("Nothing available yet...");
50 return;
51 }
52 INFO("Closing socket, received: {}, {}", bytes_received, strerror(errno));
53 Close();
54 return;
55 }
56 if ((size_t)bytes_received < bytes_left_) {
57 bytes_left_ -= bytes_received;
58 offset_ += bytes_received;
59 return;
60 }
61 pdl::packet::slice size(std::move(size_bytes_));
62 bytes_left_ = size.read_le<uint32_t>();
63 received_ = std::make_shared<std::vector<uint8_t>>(bytes_left_);
64 offset_ = 0;
65 receiving_size_ = false;
66 }
67 ssize_t bytes_received = socket_->Recv(received_->data() + offset_, bytes_left_);
68 if (bytes_received <= 0) {
69 if (errno == EAGAIN || errno == EWOULDBLOCK) {
70 // Nothing available yet.
71 // DEBUG("Nothing available yet...");
72 return;
73 }
74 INFO("Closing socket, received: {}, {}", bytes_received, strerror(errno));
75 Close();
76 return;
77 }
78 if ((size_t)bytes_received < bytes_left_) {
79 bytes_left_ -= bytes_received;
80 offset_ += bytes_received;
81 return;
82 }
83 bytes_left_ = kSizeBytes;
84 offset_ = 0;
85 receiving_size_ = true;
86 SendLinkLayerPacket(*received_, phy_type_);
87 }
88
Close()89 void LinkLayerSocketDevice::Close() {
90 if (socket_) {
91 socket_->Close();
92 }
93 Device::Close();
94 }
95
ReceiveLinkLayerPacket(model::packets::LinkLayerPacketView packet,Phy::Type,int8_t)96 void LinkLayerSocketDevice::ReceiveLinkLayerPacket(model::packets::LinkLayerPacketView packet,
97 Phy::Type /*type*/, int8_t /*rssi*/) {
98 std::vector<uint8_t> packet_bytes = packet.bytes().bytes();
99 std::vector<uint8_t> size_bytes;
100 pdl::packet::Builder::write_le<uint32_t>(size_bytes, packet_bytes.size());
101
102 if (socket_->Send(size_bytes.data(), size_bytes.size()) == kSizeBytes) {
103 socket_->Send(packet_bytes.data(), packet_bytes.size());
104 }
105 }
106
107 } // namespace rootcanal
108