Jan Kamidra / WebSocketClient

Fork of https://os.mbed.com/teams/mbed_example/code/WebSocketClient/ Update to MbedOS6

Websocket.cpp@8:ccedee13be8d, 2013-10-23 (annotated)

Committer:
mbed_official
Date:
Wed Oct 23 09:58:39 2013 +0000
Revision:
8:ccedee13be8d
Parent:
7:4567996414a5
Child:
9:efa2c147bee1
Apache V2 License

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 8:ccedee13be8d 1 /* mbed Microcontroller Library
mbed_official 8:ccedee13be8d 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 8:ccedee13be8d 3 *
mbed_official 8:ccedee13be8d 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 8:ccedee13be8d 5 * you may not use this file except in compliance with the License.
mbed_official 8:ccedee13be8d 6 * You may obtain a copy of the License at
mbed_official 8:ccedee13be8d 7 *
mbed_official 8:ccedee13be8d 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 8:ccedee13be8d 9 *
mbed_official 8:ccedee13be8d 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 8:ccedee13be8d 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 8:ccedee13be8d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 8:ccedee13be8d 13 * See the License for the specific language governing permissions and
mbed_official 8:ccedee13be8d 14 * limitations under the License.
mbed_official 8:ccedee13be8d 15 */
samux 3:9589afa4712e 16 #include "Websocket.h"
samux 3:9589afa4712e 17
samux 7:4567996414a5 18 #define MAX_TRY_WRITE 20
samux 7:4567996414a5 19 #define MAX_TRY_READ 10
samux 3:9589afa4712e 20
samux 3:9589afa4712e 21 //Debug is disabled by default
samux 3:9589afa4712e 22 #if 0
samux 3:9589afa4712e 23 #define DBG(x, ...) std::printf("[WebSocket : DBG]"x"\r\n", ##__VA_ARGS__);
samux 3:9589afa4712e 24 #define WARN(x, ...) std::printf("[WebSocket : WARN]"x"\r\n", ##__VA_ARGS__);
samux 3:9589afa4712e 25 #define ERR(x, ...) std::printf("[WebSocket : ERR]"x"\r\n", ##__VA_ARGS__);
samux 3:9589afa4712e 26 #else
samux 3:9589afa4712e 27 #define DBG(x, ...)
samux 3:9589afa4712e 28 #define WARN(x, ...)
samux 3:9589afa4712e 29 #define ERR(x, ...)
samux 3:9589afa4712e 30 #endif
samux 3:9589afa4712e 31
samux 3:9589afa4712e 32 #define INFO(x, ...) printf("[WebSocket : INFO]"x"\r\n", ##__VA_ARGS__);
samux 3:9589afa4712e 33
samux 3:9589afa4712e 34 Websocket::Websocket(char * url) {
samux 3:9589afa4712e 35 fillFields(url);
samux 3:9589afa4712e 36 socket.set_blocking(false, 400);
samux 3:9589afa4712e 37 }
samux 3:9589afa4712e 38
samux 3:9589afa4712e 39 void Websocket::fillFields(char * url) {
donatien 6:86e89a0369b9 40 int ret = parseURL(url, scheme, sizeof(scheme), host, sizeof(host), &port, path, sizeof(path));
donatien 6:86e89a0369b9 41 if(ret)
donatien 6:86e89a0369b9 42 {
donatien 6:86e89a0369b9 43 ERR("URL parsing failed; please use: \"ws://ip-or-domain[:port]/path\"");
donatien 6:86e89a0369b9 44 return;
donatien 6:86e89a0369b9 45 }
samux 3:9589afa4712e 46
donatien 6:86e89a0369b9 47 if(port == 0) //TODO do handle WSS->443
donatien 6:86e89a0369b9 48 {
donatien 6:86e89a0369b9 49 port = 80;
donatien 6:86e89a0369b9 50 }
donatien 6:86e89a0369b9 51
donatien 6:86e89a0369b9 52 if(strcmp(scheme, "ws"))
donatien 6:86e89a0369b9 53 {
donatien 6:86e89a0369b9 54 ERR("Wrong scheme, please use \"ws\" instead");
donatien 6:86e89a0369b9 55 }
donatien 6:86e89a0369b9 56 }
samux 3:9589afa4712e 57
donatien 6:86e89a0369b9 58 int Websocket::parseURL(const char* url, char* scheme, size_t maxSchemeLen, char* host, size_t maxHostLen, uint16_t* port, char* path, size_t maxPathLen) //Parse URL
donatien 6:86e89a0369b9 59 {
donatien 6:86e89a0369b9 60 char* schemePtr = (char*) url;
donatien 6:86e89a0369b9 61 char* hostPtr = (char*) strstr(url, "://");
donatien 6:86e89a0369b9 62 if(hostPtr == NULL)
donatien 6:86e89a0369b9 63 {
donatien 6:86e89a0369b9 64 WARN("Could not find host");
donatien 6:86e89a0369b9 65 return -1; //URL is invalid
donatien 6:86e89a0369b9 66 }
donatien 6:86e89a0369b9 67
donatien 6:86e89a0369b9 68 if( maxSchemeLen < hostPtr - schemePtr + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 69 {
donatien 6:86e89a0369b9 70 WARN("Scheme str is too small (%d >= %d)", maxSchemeLen, hostPtr - schemePtr + 1);
donatien 6:86e89a0369b9 71 return -1;
donatien 6:86e89a0369b9 72 }
donatien 6:86e89a0369b9 73 memcpy(scheme, schemePtr, hostPtr - schemePtr);
donatien 6:86e89a0369b9 74 scheme[hostPtr - schemePtr] = '\0';
donatien 6:86e89a0369b9 75
donatien 6:86e89a0369b9 76 hostPtr+=3;
donatien 6:86e89a0369b9 77
donatien 6:86e89a0369b9 78 size_t hostLen = 0;
samux 3:9589afa4712e 79
donatien 6:86e89a0369b9 80 char* portPtr = strchr(hostPtr, ':');
donatien 6:86e89a0369b9 81 if( portPtr != NULL )
donatien 6:86e89a0369b9 82 {
donatien 6:86e89a0369b9 83 hostLen = portPtr - hostPtr;
donatien 6:86e89a0369b9 84 portPtr++;
donatien 6:86e89a0369b9 85 if( sscanf(portPtr, "%hu", port) != 1)
donatien 6:86e89a0369b9 86 {
donatien 6:86e89a0369b9 87 WARN("Could not find port");
donatien 6:86e89a0369b9 88 return -1;
donatien 6:86e89a0369b9 89 }
donatien 6:86e89a0369b9 90 }
donatien 6:86e89a0369b9 91 else
donatien 6:86e89a0369b9 92 {
donatien 6:86e89a0369b9 93 *port=0;
donatien 6:86e89a0369b9 94 }
donatien 6:86e89a0369b9 95 char* pathPtr = strchr(hostPtr, '/');
donatien 6:86e89a0369b9 96 if( hostLen == 0 )
donatien 6:86e89a0369b9 97 {
donatien 6:86e89a0369b9 98 hostLen = pathPtr - hostPtr;
donatien 6:86e89a0369b9 99 }
samux 3:9589afa4712e 100
donatien 6:86e89a0369b9 101 if( maxHostLen < hostLen + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 102 {
donatien 6:86e89a0369b9 103 WARN("Host str is too small (%d >= %d)", maxHostLen, hostLen + 1);
donatien 6:86e89a0369b9 104 return -1;
donatien 6:86e89a0369b9 105 }
donatien 6:86e89a0369b9 106 memcpy(host, hostPtr, hostLen);
donatien 6:86e89a0369b9 107 host[hostLen] = '\0';
samux 3:9589afa4712e 108
donatien 6:86e89a0369b9 109 size_t pathLen;
donatien 6:86e89a0369b9 110 char* fragmentPtr = strchr(hostPtr, '#');
donatien 6:86e89a0369b9 111 if(fragmentPtr != NULL)
donatien 6:86e89a0369b9 112 {
donatien 6:86e89a0369b9 113 pathLen = fragmentPtr - pathPtr;
donatien 6:86e89a0369b9 114 }
donatien 6:86e89a0369b9 115 else
donatien 6:86e89a0369b9 116 {
donatien 6:86e89a0369b9 117 pathLen = strlen(pathPtr);
donatien 6:86e89a0369b9 118 }
donatien 6:86e89a0369b9 119
donatien 6:86e89a0369b9 120 if( maxPathLen < pathLen + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 121 {
donatien 6:86e89a0369b9 122 WARN("Path str is too small (%d >= %d)", maxPathLen, pathLen + 1);
donatien 6:86e89a0369b9 123 return -1;
donatien 6:86e89a0369b9 124 }
donatien 6:86e89a0369b9 125 memcpy(path, pathPtr, pathLen);
donatien 6:86e89a0369b9 126 path[pathLen] = '\0';
donatien 6:86e89a0369b9 127
donatien 6:86e89a0369b9 128 return 0;
samux 3:9589afa4712e 129 }
samux 3:9589afa4712e 130
samux 3:9589afa4712e 131
samux 3:9589afa4712e 132 bool Websocket::connect() {
samux 3:9589afa4712e 133 char cmd[200];
samux 3:9589afa4712e 134
donatien 6:86e89a0369b9 135 while (socket.connect(host, port) < 0) {
donatien 6:86e89a0369b9 136 ERR("Unable to connect to (%s) on port (%d)", host, port);
samux 3:9589afa4712e 137 wait(0.2);
donatien 6:86e89a0369b9 138 return false;
samux 3:9589afa4712e 139 }
samux 3:9589afa4712e 140
samux 3:9589afa4712e 141 // sent http header to upgrade to the ws protocol
donatien 6:86e89a0369b9 142 sprintf(cmd, "GET %s HTTP/1.1\r\n", path);
samux 3:9589afa4712e 143 write(cmd, strlen(cmd));
donatien 6:86e89a0369b9 144
donatien 6:86e89a0369b9 145 sprintf(cmd, "Host: %s:%d\r\n", host, port);
samux 3:9589afa4712e 146 write(cmd, strlen(cmd));
samux 3:9589afa4712e 147
samux 3:9589afa4712e 148 sprintf(cmd, "Upgrade: WebSocket\r\n");
samux 3:9589afa4712e 149 write(cmd, strlen(cmd));
samux 3:9589afa4712e 150
samux 3:9589afa4712e 151 sprintf(cmd, "Connection: Upgrade\r\n");
samux 3:9589afa4712e 152 write(cmd, strlen(cmd));
samux 3:9589afa4712e 153
samux 3:9589afa4712e 154 sprintf(cmd, "Sec-WebSocket-Key: L159VM0TWUzyDxwJEIEzjw==\r\n");
samux 3:9589afa4712e 155 write(cmd, strlen(cmd));
samux 3:9589afa4712e 156
samux 3:9589afa4712e 157 sprintf(cmd, "Sec-WebSocket-Version: 13\r\n\r\n");
samux 3:9589afa4712e 158 int ret = write(cmd, strlen(cmd));
samux 3:9589afa4712e 159 if (ret != strlen(cmd)) {
samux 3:9589afa4712e 160 close();
samux 3:9589afa4712e 161 ERR("Could not send request");
samux 3:9589afa4712e 162 return false;
samux 3:9589afa4712e 163 }
samux 3:9589afa4712e 164
samux 3:9589afa4712e 165 ret = read(cmd, 200, 100);
samux 3:9589afa4712e 166 if (ret < 0) {
samux 3:9589afa4712e 167 close();
samux 3:9589afa4712e 168 ERR("Could not receive answer\r\n");
samux 3:9589afa4712e 169 return false;
samux 3:9589afa4712e 170 }
samux 3:9589afa4712e 171
samux 3:9589afa4712e 172 cmd[ret] = '\0';
samux 3:9589afa4712e 173 DBG("recv: %s\r\n", cmd);
samux 3:9589afa4712e 174
samux 3:9589afa4712e 175 if ( strstr(cmd, "DdLWT/1JcX+nQFHebYP+rqEx5xI=") == NULL ) {
samux 3:9589afa4712e 176 ERR("Wrong answer from server, got \"%s\" instead\r\n", cmd);
samux 3:9589afa4712e 177 do {
samux 3:9589afa4712e 178 ret = read(cmd, 200, 100);
samux 3:9589afa4712e 179 if (ret < 0) {
samux 3:9589afa4712e 180 ERR("Could not receive answer\r\n");
samux 3:9589afa4712e 181 return false;
samux 3:9589afa4712e 182 }
samux 3:9589afa4712e 183 cmd[ret] = '\0';
samux 3:9589afa4712e 184 printf("%s",cmd);
samux 3:9589afa4712e 185 } while (ret > 0);
samux 3:9589afa4712e 186 close();
samux 3:9589afa4712e 187 return false;
samux 3:9589afa4712e 188 }
samux 3:9589afa4712e 189
donatien 6:86e89a0369b9 190 INFO("\r\nhost: %s\r\npath: %s\r\nport: %d\r\n\r\n", host, path, port);
samux 3:9589afa4712e 191 return true;
samux 3:9589afa4712e 192 }
samux 3:9589afa4712e 193
samux 4:466f90b7849a 194 int Websocket::sendLength(uint32_t len, char * msg) {
samux 3:9589afa4712e 195
samux 3:9589afa4712e 196 if (len < 126) {
samux 4:466f90b7849a 197 msg[0] = len | (1<<7);
samux 3:9589afa4712e 198 return 1;
samux 3:9589afa4712e 199 } else if (len < 65535) {
samux 4:466f90b7849a 200 msg[0] = 126 | (1<<7);
samux 4:466f90b7849a 201 msg[1] = (len >> 8) & 0xff;
samux 4:466f90b7849a 202 msg[2] = len & 0xff;
samux 3:9589afa4712e 203 return 3;
samux 3:9589afa4712e 204 } else {
samux 4:466f90b7849a 205 msg[0] = 127 | (1<<7);
samux 3:9589afa4712e 206 for (int i = 0; i < 8; i++) {
samux 4:466f90b7849a 207 msg[i+1] = (len >> i*8) & 0xff;
samux 3:9589afa4712e 208 }
samux 3:9589afa4712e 209 return 9;
samux 3:9589afa4712e 210 }
samux 3:9589afa4712e 211 }
samux 3:9589afa4712e 212
samux 3:9589afa4712e 213 int Websocket::readChar(char * pC, bool block) {
samux 3:9589afa4712e 214 return read(pC, 1, 1);
samux 3:9589afa4712e 215 }
samux 3:9589afa4712e 216
samux 4:466f90b7849a 217 int Websocket::sendOpcode(uint8_t opcode, char * msg) {
samux 4:466f90b7849a 218 msg[0] = 0x80 | (opcode & 0x0f);
samux 4:466f90b7849a 219 return 1;
samux 3:9589afa4712e 220 }
samux 3:9589afa4712e 221
samux 4:466f90b7849a 222 int Websocket::sendMask(char * msg) {
samux 3:9589afa4712e 223 for (int i = 0; i < 4; i++) {
samux 4:466f90b7849a 224 msg[i] = 0;
samux 3:9589afa4712e 225 }
samux 3:9589afa4712e 226 return 4;
samux 3:9589afa4712e 227 }
samux 3:9589afa4712e 228
samux 3:9589afa4712e 229 int Websocket::send(char * str) {
samux 4:466f90b7849a 230 char msg[strlen(str) + 15];
samux 4:466f90b7849a 231 int idx = 0;
samux 4:466f90b7849a 232 idx = sendOpcode(0x01, msg);
samux 4:466f90b7849a 233 idx += sendLength(strlen(str), msg + idx);
samux 4:466f90b7849a 234 idx += sendMask(msg + idx);
samux 4:466f90b7849a 235 memcpy(msg+idx, str, strlen(str));
samux 4:466f90b7849a 236 int res = write(msg, idx + strlen(str));
samux 3:9589afa4712e 237 return res;
samux 3:9589afa4712e 238 }
samux 3:9589afa4712e 239
samux 3:9589afa4712e 240
samux 3:9589afa4712e 241 bool Websocket::read(char * message) {
samux 3:9589afa4712e 242 int i = 0;
samux 3:9589afa4712e 243 uint32_t len_msg;
samux 3:9589afa4712e 244 char opcode = 0;
samux 3:9589afa4712e 245 char c;
samux 3:9589afa4712e 246 char mask[4] = {0, 0, 0, 0};
samux 3:9589afa4712e 247 bool is_masked = false;
samux 3:9589afa4712e 248 Timer tmr;
samux 3:9589afa4712e 249
samux 3:9589afa4712e 250 // read the opcode
samux 3:9589afa4712e 251 tmr.start();
samux 3:9589afa4712e 252 while (true) {
samux 3:9589afa4712e 253 if (tmr.read() > 3) {
samux 3:9589afa4712e 254 DBG("timeout ws\r\n");
samux 3:9589afa4712e 255 return false;
samux 3:9589afa4712e 256 }
donatien 5:bb09d7a6c92f 257
donatien 5:bb09d7a6c92f 258 if(!socket.is_connected())
donatien 5:bb09d7a6c92f 259 {
donatien 5:bb09d7a6c92f 260 WARN("Connection was closed by server");
donatien 5:bb09d7a6c92f 261 return false;
donatien 5:bb09d7a6c92f 262 }
samux 3:9589afa4712e 263
samux 3:9589afa4712e 264 socket.set_blocking(false, 1);
samux 3:9589afa4712e 265 if (socket.receive(&opcode, 1) != 1) {
samux 3:9589afa4712e 266 socket.set_blocking(false, 2000);
samux 3:9589afa4712e 267 return false;
samux 3:9589afa4712e 268 }
samux 3:9589afa4712e 269
samux 3:9589afa4712e 270 socket.set_blocking(false, 2000);
samux 3:9589afa4712e 271
samux 3:9589afa4712e 272 if (opcode == 0x81)
samux 3:9589afa4712e 273 break;
samux 3:9589afa4712e 274 }
samux 3:9589afa4712e 275 DBG("opcode: 0x%X\r\n", opcode);
samux 3:9589afa4712e 276
samux 3:9589afa4712e 277 readChar(&c);
samux 3:9589afa4712e 278 len_msg = c & 0x7f;
samux 3:9589afa4712e 279 is_masked = c & 0x80;
samux 3:9589afa4712e 280 if (len_msg == 126) {
samux 3:9589afa4712e 281 readChar(&c);
samux 3:9589afa4712e 282 len_msg = c << 8;
samux 3:9589afa4712e 283 readChar(&c);
samux 3:9589afa4712e 284 len_msg += c;
samux 3:9589afa4712e 285 } else if (len_msg == 127) {
samux 3:9589afa4712e 286 len_msg = 0;
samux 3:9589afa4712e 287 for (int i = 0; i < 8; i++) {
samux 3:9589afa4712e 288 readChar(&c);
samux 3:9589afa4712e 289 len_msg += (c << (7-i)*8);
samux 3:9589afa4712e 290 }
samux 3:9589afa4712e 291 }
samux 3:9589afa4712e 292
samux 3:9589afa4712e 293 if (len_msg == 0) {
samux 3:9589afa4712e 294 return false;
samux 3:9589afa4712e 295 }
samux 3:9589afa4712e 296 DBG("length: %d\r\n", len_msg);
samux 3:9589afa4712e 297
samux 3:9589afa4712e 298 if (is_masked) {
samux 3:9589afa4712e 299 for (i = 0; i < 4; i++)
samux 3:9589afa4712e 300 readChar(&c);
samux 3:9589afa4712e 301 mask[i] = c;
samux 3:9589afa4712e 302 }
samux 3:9589afa4712e 303
samux 3:9589afa4712e 304 int nb = read(message, len_msg, len_msg);
samux 3:9589afa4712e 305 if (nb != len_msg)
samux 3:9589afa4712e 306 return false;
samux 3:9589afa4712e 307
samux 3:9589afa4712e 308 for (i = 0; i < len_msg; i++) {
samux 3:9589afa4712e 309 message[i] = message[i] ^ mask[i % 4];
samux 3:9589afa4712e 310 }
samux 3:9589afa4712e 311
samux 3:9589afa4712e 312 message[len_msg] = '\0';
samux 3:9589afa4712e 313
samux 3:9589afa4712e 314 return true;
samux 3:9589afa4712e 315 }
samux 3:9589afa4712e 316
samux 3:9589afa4712e 317 bool Websocket::close() {
samux 3:9589afa4712e 318 if (!is_connected())
samux 3:9589afa4712e 319 return false;
samux 3:9589afa4712e 320
samux 3:9589afa4712e 321 int ret = socket.close();
samux 3:9589afa4712e 322 if (ret < 0) {
samux 3:9589afa4712e 323 ERR("Could not disconnect");
samux 3:9589afa4712e 324 return false;
samux 3:9589afa4712e 325 }
samux 3:9589afa4712e 326 return true;
samux 3:9589afa4712e 327 }
samux 3:9589afa4712e 328
samux 3:9589afa4712e 329 bool Websocket::is_connected() {
samux 3:9589afa4712e 330 return socket.is_connected();
samux 3:9589afa4712e 331 }
samux 3:9589afa4712e 332
donatien 6:86e89a0369b9 333 char* Websocket::getPath() {
samux 3:9589afa4712e 334 return path;
samux 3:9589afa4712e 335 }
samux 3:9589afa4712e 336
samux 3:9589afa4712e 337 int Websocket::write(char * str, int len) {
samux 3:9589afa4712e 338 int res = 0, idx = 0;
samux 3:9589afa4712e 339
samux 3:9589afa4712e 340 for (int j = 0; j < MAX_TRY_WRITE; j++) {
donatien 5:bb09d7a6c92f 341
donatien 5:bb09d7a6c92f 342 if(!socket.is_connected())
donatien 5:bb09d7a6c92f 343 {
donatien 5:bb09d7a6c92f 344 WARN("Connection was closed by server");
donatien 5:bb09d7a6c92f 345 break;
donatien 5:bb09d7a6c92f 346 }
samux 3:9589afa4712e 347
samux 3:9589afa4712e 348 if ((res = socket.send_all(str + idx, len - idx)) == -1)
samux 3:9589afa4712e 349 continue;
samux 3:9589afa4712e 350
samux 3:9589afa4712e 351 idx += res;
samux 3:9589afa4712e 352
samux 3:9589afa4712e 353 if (idx == len)
samux 3:9589afa4712e 354 return len;
samux 3:9589afa4712e 355 }
samux 3:9589afa4712e 356
samux 3:9589afa4712e 357 return (idx == 0) ? -1 : idx;
samux 3:9589afa4712e 358 }
samux 3:9589afa4712e 359
samux 3:9589afa4712e 360 int Websocket::read(char * str, int len, int min_len) {
samux 3:9589afa4712e 361 int res = 0, idx = 0;
samux 3:9589afa4712e 362
samux 3:9589afa4712e 363 for (int j = 0; j < MAX_TRY_WRITE; j++) {
samux 3:9589afa4712e 364
samux 3:9589afa4712e 365 if ((res = socket.receive_all(str + idx, len - idx)) == -1)
samux 3:9589afa4712e 366 continue;
samux 3:9589afa4712e 367
samux 3:9589afa4712e 368 idx += res;
samux 3:9589afa4712e 369
samux 3:9589afa4712e 370 if (idx == len || (min_len != -1 && idx > min_len))
samux 3:9589afa4712e 371 return idx;
samux 3:9589afa4712e 372 }
samux 3:9589afa4712e 373
samux 3:9589afa4712e 374 return (idx == 0) ? -1 : idx;
samux 3:9589afa4712e 375 }