Mike J. Chen | 6c92951 | 2011-08-15 11:59:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 | /* |
| 18 | * A service that exchanges time synchronization information between |
| 19 | * a master that defines a timeline and clients that follow the timeline. |
| 20 | */ |
| 21 | |
| 22 | #define LOG_TAG "common_time" |
| 23 | #include <utils/Log.h> |
| 24 | |
| 25 | #include <arpa/inet.h> |
| 26 | #include <stdint.h> |
| 27 | |
| 28 | #include "common_time_server_packets.h" |
| 29 | |
| 30 | namespace android { |
| 31 | |
| 32 | const uint32_t TimeServicePacketHeader::kMagic = |
| 33 | (static_cast<uint32_t>('c') << 24) | |
| 34 | (static_cast<uint32_t>('c') << 16) | |
| 35 | (static_cast<uint32_t>('l') << 8) | |
| 36 | static_cast<uint32_t>('k'); |
| 37 | |
| 38 | const uint16_t TimeServicePacketHeader::kCurVersion = 1; |
| 39 | |
| 40 | #define SERIALIZE_FIELD(field_name, type, converter) \ |
| 41 | do { \ |
| 42 | if ((offset + sizeof(field_name)) > length) \ |
| 43 | return -1; \ |
| 44 | *((type*)(data + offset)) = converter(field_name); \ |
| 45 | offset += sizeof(field_name); \ |
| 46 | } while (0) |
| 47 | #define SERIALIZE_INT16(field_name) SERIALIZE_FIELD(field_name, int16_t, htons) |
| 48 | #define SERIALIZE_INT32(field_name) SERIALIZE_FIELD(field_name, int32_t, htonl) |
| 49 | #define SERIALIZE_INT64(field_name) SERIALIZE_FIELD(field_name, int64_t, htonq) |
| 50 | |
Chih-Hung Hsieh | 2bd7a3e | 2016-05-19 15:21:42 -0700 | [diff] [blame] | 51 | #define DESERIALIZE_FIELD(field_name, type, converter) \ |
| 52 | do { \ |
| 53 | if ((offset + sizeof(field_name)) > length) \ |
| 54 | return -1; \ |
| 55 | (field_name) = converter(*((type*)(data + offset))); \ |
| 56 | offset += sizeof(field_name); \ |
Mike J. Chen | 6c92951 | 2011-08-15 11:59:47 -0700 | [diff] [blame] | 57 | } while (0) |
| 58 | #define DESERIALIZE_INT16(field_name) DESERIALIZE_FIELD(field_name, int16_t, ntohs) |
| 59 | #define DESERIALIZE_INT32(field_name) DESERIALIZE_FIELD(field_name, int32_t, ntohl) |
| 60 | #define DESERIALIZE_INT64(field_name) DESERIALIZE_FIELD(field_name, int64_t, ntohq) |
| 61 | |
| 62 | #define kDevicePriorityShift 56 |
| 63 | #define kDeviceIDMask ((static_cast<uint64_t>(1) << kDevicePriorityShift) - 1) |
| 64 | |
| 65 | inline uint64_t packDeviceID(uint64_t devID, uint8_t prio) { |
| 66 | return (devID & kDeviceIDMask) | |
| 67 | (static_cast<uint64_t>(prio) << kDevicePriorityShift); |
| 68 | } |
| 69 | |
| 70 | inline uint64_t unpackDeviceID(uint64_t packed) { |
| 71 | return (packed & kDeviceIDMask); |
| 72 | } |
| 73 | |
| 74 | inline uint8_t unpackDevicePriority(uint64_t packed) { |
| 75 | return static_cast<uint8_t>(packed >> kDevicePriorityShift); |
| 76 | } |
| 77 | |
| 78 | ssize_t TimeServicePacketHeader::serializeHeader(uint8_t* data, |
| 79 | uint32_t length) { |
| 80 | ssize_t offset = 0; |
| 81 | int16_t pktType = static_cast<int16_t>(packetType); |
| 82 | SERIALIZE_INT32(magic); |
| 83 | SERIALIZE_INT16(version); |
| 84 | SERIALIZE_INT16(pktType); |
| 85 | SERIALIZE_INT64(timelineID); |
| 86 | SERIALIZE_INT64(syncGroupID); |
| 87 | return offset; |
| 88 | } |
| 89 | |
| 90 | ssize_t TimeServicePacketHeader::deserializeHeader(const uint8_t* data, |
| 91 | uint32_t length) { |
| 92 | ssize_t offset = 0; |
| 93 | int16_t tmp; |
| 94 | DESERIALIZE_INT32(magic); |
| 95 | DESERIALIZE_INT16(version); |
| 96 | DESERIALIZE_INT16(tmp); |
| 97 | DESERIALIZE_INT64(timelineID); |
| 98 | DESERIALIZE_INT64(syncGroupID); |
| 99 | packetType = static_cast<TimeServicePacketType>(tmp); |
| 100 | return offset; |
| 101 | } |
| 102 | |
| 103 | ssize_t TimeServicePacketHeader::serializePacket(uint8_t* data, |
| 104 | uint32_t length) { |
| 105 | ssize_t ret, tmp; |
| 106 | |
| 107 | ret = serializeHeader(data, length); |
| 108 | if (ret < 0) |
| 109 | return ret; |
| 110 | |
| 111 | data += ret; |
| 112 | length -= ret; |
| 113 | |
| 114 | switch (packetType) { |
| 115 | case TIME_PACKET_WHO_IS_MASTER_REQUEST: |
| 116 | tmp =((WhoIsMasterRequestPacket*)(this))->serializePacket(data, |
| 117 | length); |
| 118 | break; |
| 119 | case TIME_PACKET_WHO_IS_MASTER_RESPONSE: |
| 120 | tmp =((WhoIsMasterResponsePacket*)(this))->serializePacket(data, |
| 121 | length); |
| 122 | break; |
| 123 | case TIME_PACKET_SYNC_REQUEST: |
| 124 | tmp =((SyncRequestPacket*)(this))->serializePacket(data, length); |
| 125 | break; |
| 126 | case TIME_PACKET_SYNC_RESPONSE: |
| 127 | tmp =((SyncResponsePacket*)(this))->serializePacket(data, length); |
| 128 | break; |
| 129 | case TIME_PACKET_MASTER_ANNOUNCEMENT: |
| 130 | tmp =((MasterAnnouncementPacket*)(this))->serializePacket(data, |
| 131 | length); |
| 132 | break; |
| 133 | default: |
| 134 | return -1; |
| 135 | } |
| 136 | |
| 137 | if (tmp < 0) |
| 138 | return tmp; |
| 139 | |
| 140 | return ret + tmp; |
| 141 | } |
| 142 | |
| 143 | ssize_t UniversalTimeServicePacket::deserializePacket( |
| 144 | const uint8_t* data, |
| 145 | uint32_t length, |
| 146 | uint64_t expectedSyncGroupID) { |
| 147 | ssize_t ret; |
| 148 | TimeServicePacketHeader* header; |
| 149 | if (length < 8) |
| 150 | return -1; |
| 151 | |
| 152 | packetType = ntohs(*((uint16_t*)(data + 6))); |
| 153 | switch (packetType) { |
| 154 | case TIME_PACKET_WHO_IS_MASTER_REQUEST: |
| 155 | ret = p.who_is_master_request.deserializePacket(data, length); |
| 156 | header = &p.who_is_master_request; |
| 157 | break; |
| 158 | case TIME_PACKET_WHO_IS_MASTER_RESPONSE: |
| 159 | ret = p.who_is_master_response.deserializePacket(data, length); |
| 160 | header = &p.who_is_master_response; |
| 161 | break; |
| 162 | case TIME_PACKET_SYNC_REQUEST: |
| 163 | ret = p.sync_request.deserializePacket(data, length); |
| 164 | header = &p.sync_request; |
| 165 | break; |
| 166 | case TIME_PACKET_SYNC_RESPONSE: |
| 167 | ret = p.sync_response.deserializePacket(data, length); |
| 168 | header = &p.sync_response; |
| 169 | break; |
| 170 | case TIME_PACKET_MASTER_ANNOUNCEMENT: |
| 171 | ret = p.master_announcement.deserializePacket(data, length); |
| 172 | header = &p.master_announcement; |
| 173 | break; |
| 174 | default: |
| 175 | return -1; |
| 176 | } |
| 177 | |
| 178 | if ((ret >= 0) && !header->checkPacket(expectedSyncGroupID)) |
| 179 | ret = -1; |
| 180 | |
| 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | ssize_t WhoIsMasterRequestPacket::serializePacket(uint8_t* data, |
| 185 | uint32_t length) { |
| 186 | ssize_t offset = serializeHeader(data, length); |
| 187 | if (offset > 0) { |
| 188 | uint64_t packed = packDeviceID(senderDeviceID, senderDevicePriority); |
| 189 | SERIALIZE_INT64(packed); |
| 190 | } |
| 191 | return offset; |
| 192 | } |
| 193 | |
| 194 | ssize_t WhoIsMasterRequestPacket::deserializePacket(const uint8_t* data, |
| 195 | uint32_t length) { |
| 196 | ssize_t offset = deserializeHeader(data, length); |
| 197 | if (offset > 0) { |
| 198 | uint64_t packed; |
| 199 | DESERIALIZE_INT64(packed); |
| 200 | senderDeviceID = unpackDeviceID(packed); |
| 201 | senderDevicePriority = unpackDevicePriority(packed); |
| 202 | } |
| 203 | return offset; |
| 204 | } |
| 205 | |
| 206 | ssize_t WhoIsMasterResponsePacket::serializePacket(uint8_t* data, |
| 207 | uint32_t length) { |
| 208 | ssize_t offset = serializeHeader(data, length); |
| 209 | if (offset > 0) { |
| 210 | uint64_t packed = packDeviceID(deviceID, devicePriority); |
| 211 | SERIALIZE_INT64(packed); |
| 212 | } |
| 213 | return offset; |
| 214 | } |
| 215 | |
| 216 | ssize_t WhoIsMasterResponsePacket::deserializePacket(const uint8_t* data, |
| 217 | uint32_t length) { |
| 218 | ssize_t offset = deserializeHeader(data, length); |
| 219 | if (offset > 0) { |
| 220 | uint64_t packed; |
| 221 | DESERIALIZE_INT64(packed); |
| 222 | deviceID = unpackDeviceID(packed); |
| 223 | devicePriority = unpackDevicePriority(packed); |
| 224 | } |
| 225 | return offset; |
| 226 | } |
| 227 | |
| 228 | ssize_t SyncRequestPacket::serializePacket(uint8_t* data, |
| 229 | uint32_t length) { |
| 230 | ssize_t offset = serializeHeader(data, length); |
| 231 | if (offset > 0) { |
| 232 | SERIALIZE_INT64(clientTxLocalTime); |
| 233 | } |
| 234 | return offset; |
| 235 | } |
| 236 | |
| 237 | ssize_t SyncRequestPacket::deserializePacket(const uint8_t* data, |
| 238 | uint32_t length) { |
| 239 | ssize_t offset = deserializeHeader(data, length); |
| 240 | if (offset > 0) { |
| 241 | DESERIALIZE_INT64(clientTxLocalTime); |
| 242 | } |
| 243 | return offset; |
| 244 | } |
| 245 | |
| 246 | ssize_t SyncResponsePacket::serializePacket(uint8_t* data, |
| 247 | uint32_t length) { |
| 248 | ssize_t offset = serializeHeader(data, length); |
| 249 | if (offset > 0) { |
| 250 | SERIALIZE_INT64(clientTxLocalTime); |
| 251 | SERIALIZE_INT64(masterRxCommonTime); |
| 252 | SERIALIZE_INT64(masterTxCommonTime); |
| 253 | SERIALIZE_INT32(nak); |
| 254 | } |
| 255 | return offset; |
| 256 | } |
| 257 | |
| 258 | ssize_t SyncResponsePacket::deserializePacket(const uint8_t* data, |
| 259 | uint32_t length) { |
| 260 | ssize_t offset = deserializeHeader(data, length); |
| 261 | if (offset > 0) { |
| 262 | DESERIALIZE_INT64(clientTxLocalTime); |
| 263 | DESERIALIZE_INT64(masterRxCommonTime); |
| 264 | DESERIALIZE_INT64(masterTxCommonTime); |
| 265 | DESERIALIZE_INT32(nak); |
| 266 | } |
| 267 | return offset; |
| 268 | } |
| 269 | |
| 270 | ssize_t MasterAnnouncementPacket::serializePacket(uint8_t* data, |
| 271 | uint32_t length) { |
| 272 | ssize_t offset = serializeHeader(data, length); |
| 273 | if (offset > 0) { |
| 274 | uint64_t packed = packDeviceID(deviceID, devicePriority); |
| 275 | SERIALIZE_INT64(packed); |
| 276 | } |
| 277 | return offset; |
| 278 | } |
| 279 | |
| 280 | ssize_t MasterAnnouncementPacket::deserializePacket(const uint8_t* data, |
| 281 | uint32_t length) { |
| 282 | ssize_t offset = deserializeHeader(data, length); |
| 283 | if (offset > 0) { |
| 284 | uint64_t packed; |
| 285 | DESERIALIZE_INT64(packed); |
| 286 | deviceID = unpackDeviceID(packed); |
| 287 | devicePriority = unpackDevicePriority(packed); |
| 288 | } |
| 289 | return offset; |
| 290 | } |
| 291 | |
| 292 | } // namespace android |
| 293 | |