Doug Anson / WebSocketClient-ThermostatDemo

modified for Doug Ansons ThermostatDemo: single change that turns off the debugging information by default.

Dependents:   df-2013-thermostat-handson df-2013-minihack-thermostat-complete df-2013-minihack-thermostat df-2013-thermostat-remotes

Fork of WebSocketClient by Doug Anson

Websocket.cpp@9:8ee61b912743, 2013-06-28 (annotated)

Committer:
ansond
Date:
Fri Jun 28 19:36:04 2013 +0000
Revision:
9:8ee61b912743
Parent:
8:4daf215761cb 
turned off debugging - it appeared to break the API with it enabled.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samux 3:9589afa4712e 1 #include "Websocket.h"
samux 3:9589afa4712e 2
samux 7:4567996414a5 3 #define MAX_TRY_WRITE 20
samux 7:4567996414a5 4 #define MAX_TRY_READ 10
samux 3:9589afa4712e 5
samux 3:9589afa4712e 6 //Debug is disabled by default
ansond 9:8ee61b912743 7 #if 0
samux 3:9589afa4712e 8 #define DBG(x, ...) std::printf("[WebSocket : DBG]"x"\r\n", ##__VA_ARGS__);
samux 3:9589afa4712e 9 #define WARN(x, ...) std::printf("[WebSocket : WARN]"x"\r\n", ##__VA_ARGS__);
samux 3:9589afa4712e 10 #define ERR(x, ...) std::printf("[WebSocket : ERR]"x"\r\n", ##__VA_ARGS__);
ansond 9:8ee61b912743 11 #define INFO(x, ...) printf("[WebSocket : INFO]"x"\r\n", ##__VA_ARGS__);
samux 3:9589afa4712e 12 #else
samux 3:9589afa4712e 13 #define DBG(x, ...)
samux 3:9589afa4712e 14 #define WARN(x, ...)
samux 3:9589afa4712e 15 #define ERR(x, ...)
ansond 9:8ee61b912743 16 #define INFO(x, ...)
samux 3:9589afa4712e 17 #endif
samux 3:9589afa4712e 18
ansond 9:8ee61b912743 19
samux 3:9589afa4712e 20
samux 3:9589afa4712e 21 Websocket::Websocket(char * url) {
samux 3:9589afa4712e 22 fillFields(url);
samux 3:9589afa4712e 23 socket.set_blocking(false, 400);
samux 3:9589afa4712e 24 }
samux 3:9589afa4712e 25
samux 3:9589afa4712e 26 void Websocket::fillFields(char * url) {
donatien 6:86e89a0369b9 27 int ret = parseURL(url, scheme, sizeof(scheme), host, sizeof(host), &port, path, sizeof(path));
donatien 6:86e89a0369b9 28 if(ret)
donatien 6:86e89a0369b9 29 {
donatien 6:86e89a0369b9 30 ERR("URL parsing failed; please use: \"ws://ip-or-domain[:port]/path\"");
donatien 6:86e89a0369b9 31 return;
donatien 6:86e89a0369b9 32 }
samux 3:9589afa4712e 33
donatien 6:86e89a0369b9 34 if(port == 0) //TODO do handle WSS->443
donatien 6:86e89a0369b9 35 {
donatien 6:86e89a0369b9 36 port = 80;
donatien 6:86e89a0369b9 37 }
donatien 6:86e89a0369b9 38
donatien 6:86e89a0369b9 39 if(strcmp(scheme, "ws"))
donatien 6:86e89a0369b9 40 {
donatien 6:86e89a0369b9 41 ERR("Wrong scheme, please use \"ws\" instead");
donatien 6:86e89a0369b9 42 }
donatien 6:86e89a0369b9 43 }
samux 3:9589afa4712e 44
donatien 6:86e89a0369b9 45 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 46 {
donatien 6:86e89a0369b9 47 char* schemePtr = (char*) url;
donatien 6:86e89a0369b9 48 char* hostPtr = (char*) strstr(url, "://");
donatien 6:86e89a0369b9 49 if(hostPtr == NULL)
donatien 6:86e89a0369b9 50 {
donatien 6:86e89a0369b9 51 WARN("Could not find host");
donatien 6:86e89a0369b9 52 return -1; //URL is invalid
donatien 6:86e89a0369b9 53 }
donatien 6:86e89a0369b9 54
donatien 6:86e89a0369b9 55 if( maxSchemeLen < hostPtr - schemePtr + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 56 {
donatien 6:86e89a0369b9 57 WARN("Scheme str is too small (%d >= %d)", maxSchemeLen, hostPtr - schemePtr + 1);
donatien 6:86e89a0369b9 58 return -1;
donatien 6:86e89a0369b9 59 }
donatien 6:86e89a0369b9 60 memcpy(scheme, schemePtr, hostPtr - schemePtr);
donatien 6:86e89a0369b9 61 scheme[hostPtr - schemePtr] = '\0';
donatien 6:86e89a0369b9 62
donatien 6:86e89a0369b9 63 hostPtr+=3;
donatien 6:86e89a0369b9 64
donatien 6:86e89a0369b9 65 size_t hostLen = 0;
samux 3:9589afa4712e 66
donatien 6:86e89a0369b9 67 char* portPtr = strchr(hostPtr, ':');
donatien 6:86e89a0369b9 68 if( portPtr != NULL )
donatien 6:86e89a0369b9 69 {
donatien 6:86e89a0369b9 70 hostLen = portPtr - hostPtr;
donatien 6:86e89a0369b9 71 portPtr++;
donatien 6:86e89a0369b9 72 if( sscanf(portPtr, "%hu", port) != 1)
donatien 6:86e89a0369b9 73 {
donatien 6:86e89a0369b9 74 WARN("Could not find port");
donatien 6:86e89a0369b9 75 return -1;
donatien 6:86e89a0369b9 76 }
donatien 6:86e89a0369b9 77 }
donatien 6:86e89a0369b9 78 else
donatien 6:86e89a0369b9 79 {
donatien 6:86e89a0369b9 80 *port=0;
donatien 6:86e89a0369b9 81 }
donatien 6:86e89a0369b9 82 char* pathPtr = strchr(hostPtr, '/');
donatien 6:86e89a0369b9 83 if( hostLen == 0 )
donatien 6:86e89a0369b9 84 {
donatien 6:86e89a0369b9 85 hostLen = pathPtr - hostPtr;
donatien 6:86e89a0369b9 86 }
samux 3:9589afa4712e 87
donatien 6:86e89a0369b9 88 if( maxHostLen < hostLen + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 89 {
donatien 6:86e89a0369b9 90 WARN("Host str is too small (%d >= %d)", maxHostLen, hostLen + 1);
donatien 6:86e89a0369b9 91 return -1;
donatien 6:86e89a0369b9 92 }
donatien 6:86e89a0369b9 93 memcpy(host, hostPtr, hostLen);
donatien 6:86e89a0369b9 94 host[hostLen] = '\0';
samux 3:9589afa4712e 95
donatien 6:86e89a0369b9 96 size_t pathLen;
donatien 6:86e89a0369b9 97 char* fragmentPtr = strchr(hostPtr, '#');
donatien 6:86e89a0369b9 98 if(fragmentPtr != NULL)
donatien 6:86e89a0369b9 99 {
donatien 6:86e89a0369b9 100 pathLen = fragmentPtr - pathPtr;
donatien 6:86e89a0369b9 101 }
donatien 6:86e89a0369b9 102 else
donatien 6:86e89a0369b9 103 {
donatien 6:86e89a0369b9 104 pathLen = strlen(pathPtr);
donatien 6:86e89a0369b9 105 }
donatien 6:86e89a0369b9 106
donatien 6:86e89a0369b9 107 if( maxPathLen < pathLen + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 108 {
donatien 6:86e89a0369b9 109 WARN("Path str is too small (%d >= %d)", maxPathLen, pathLen + 1);
donatien 6:86e89a0369b9 110 return -1;
donatien 6:86e89a0369b9 111 }
donatien 6:86e89a0369b9 112 memcpy(path, pathPtr, pathLen);
donatien 6:86e89a0369b9 113 path[pathLen] = '\0';
donatien 6:86e89a0369b9 114
donatien 6:86e89a0369b9 115 return 0;
samux 3:9589afa4712e 116 }
samux 3:9589afa4712e 117
samux 3:9589afa4712e 118
samux 3:9589afa4712e 119 bool Websocket::connect() {
samux 3:9589afa4712e 120 char cmd[200];
samux 3:9589afa4712e 121
donatien 6:86e89a0369b9 122 while (socket.connect(host, port) < 0) {
donatien 6:86e89a0369b9 123 ERR("Unable to connect to (%s) on port (%d)", host, port);
samux 3:9589afa4712e 124 wait(0.2);
donatien 6:86e89a0369b9 125 return false;
samux 3:9589afa4712e 126 }
samux 3:9589afa4712e 127
samux 3:9589afa4712e 128 // sent http header to upgrade to the ws protocol
donatien 6:86e89a0369b9 129 sprintf(cmd, "GET %s HTTP/1.1\r\n", path);
samux 3:9589afa4712e 130 write(cmd, strlen(cmd));
donatien 6:86e89a0369b9 131
donatien 6:86e89a0369b9 132 sprintf(cmd, "Host: %s:%d\r\n", host, port);
samux 3:9589afa4712e 133 write(cmd, strlen(cmd));
samux 3:9589afa4712e 134
samux 3:9589afa4712e 135 sprintf(cmd, "Upgrade: WebSocket\r\n");
samux 3:9589afa4712e 136 write(cmd, strlen(cmd));
samux 3:9589afa4712e 137
samux 3:9589afa4712e 138 sprintf(cmd, "Connection: Upgrade\r\n");
samux 3:9589afa4712e 139 write(cmd, strlen(cmd));
samux 3:9589afa4712e 140
samux 3:9589afa4712e 141 sprintf(cmd, "Sec-WebSocket-Key: L159VM0TWUzyDxwJEIEzjw==\r\n");
samux 3:9589afa4712e 142 write(cmd, strlen(cmd));
samux 3:9589afa4712e 143
samux 3:9589afa4712e 144 sprintf(cmd, "Sec-WebSocket-Version: 13\r\n\r\n");
samux 3:9589afa4712e 145 int ret = write(cmd, strlen(cmd));
samux 3:9589afa4712e 146 if (ret != strlen(cmd)) {
samux 3:9589afa4712e 147 close();
samux 3:9589afa4712e 148 ERR("Could not send request");
samux 3:9589afa4712e 149 return false;
samux 3:9589afa4712e 150 }
samux 3:9589afa4712e 151
samux 3:9589afa4712e 152 ret = read(cmd, 200, 100);
samux 3:9589afa4712e 153 if (ret < 0) {
samux 3:9589afa4712e 154 close();
samux 3:9589afa4712e 155 ERR("Could not receive answer\r\n");
samux 3:9589afa4712e 156 return false;
samux 3:9589afa4712e 157 }
samux 3:9589afa4712e 158
samux 3:9589afa4712e 159 cmd[ret] = '\0';
samux 3:9589afa4712e 160 DBG("recv: %s\r\n", cmd);
samux 3:9589afa4712e 161
samux 3:9589afa4712e 162 if ( strstr(cmd, "DdLWT/1JcX+nQFHebYP+rqEx5xI=") == NULL ) {
samux 3:9589afa4712e 163 ERR("Wrong answer from server, got \"%s\" instead\r\n", cmd);
samux 3:9589afa4712e 164 do {
samux 3:9589afa4712e 165 ret = read(cmd, 200, 100);
samux 3:9589afa4712e 166 if (ret < 0) {
samux 3:9589afa4712e 167 ERR("Could not receive answer\r\n");
samux 3:9589afa4712e 168 return false;
samux 3:9589afa4712e 169 }
samux 3:9589afa4712e 170 cmd[ret] = '\0';
samux 3:9589afa4712e 171 printf("%s",cmd);
samux 3:9589afa4712e 172 } while (ret > 0);
samux 3:9589afa4712e 173 close();
samux 3:9589afa4712e 174 return false;
samux 3:9589afa4712e 175 }
samux 3:9589afa4712e 176
donatien 6:86e89a0369b9 177 INFO("\r\nhost: %s\r\npath: %s\r\nport: %d\r\n\r\n", host, path, port);
samux 3:9589afa4712e 178 return true;
samux 3:9589afa4712e 179 }
samux 3:9589afa4712e 180
samux 4:466f90b7849a 181 int Websocket::sendLength(uint32_t len, char * msg) {
samux 3:9589afa4712e 182
samux 3:9589afa4712e 183 if (len < 126) {
samux 4:466f90b7849a 184 msg[0] = len | (1<<7);
samux 3:9589afa4712e 185 return 1;
samux 3:9589afa4712e 186 } else if (len < 65535) {
samux 4:466f90b7849a 187 msg[0] = 126 | (1<<7);
samux 4:466f90b7849a 188 msg[1] = (len >> 8) & 0xff;
samux 4:466f90b7849a 189 msg[2] = len & 0xff;
samux 3:9589afa4712e 190 return 3;
samux 3:9589afa4712e 191 } else {
samux 4:466f90b7849a 192 msg[0] = 127 | (1<<7);
samux 3:9589afa4712e 193 for (int i = 0; i < 8; i++) {
samux 4:466f90b7849a 194 msg[i+1] = (len >> i*8) & 0xff;
samux 3:9589afa4712e 195 }
samux 3:9589afa4712e 196 return 9;
samux 3:9589afa4712e 197 }
samux 3:9589afa4712e 198 }
samux 3:9589afa4712e 199
samux 3:9589afa4712e 200 int Websocket::readChar(char * pC, bool block) {
samux 3:9589afa4712e 201 return read(pC, 1, 1);
samux 3:9589afa4712e 202 }
samux 3:9589afa4712e 203
samux 4:466f90b7849a 204 int Websocket::sendOpcode(uint8_t opcode, char * msg) {
samux 4:466f90b7849a 205 msg[0] = 0x80 | (opcode & 0x0f);
samux 4:466f90b7849a 206 return 1;
samux 3:9589afa4712e 207 }
samux 3:9589afa4712e 208
samux 4:466f90b7849a 209 int Websocket::sendMask(char * msg) {
samux 3:9589afa4712e 210 for (int i = 0; i < 4; i++) {
samux 4:466f90b7849a 211 msg[i] = 0;
samux 3:9589afa4712e 212 }
samux 3:9589afa4712e 213 return 4;
samux 3:9589afa4712e 214 }
samux 3:9589afa4712e 215
samux 3:9589afa4712e 216 int Websocket::send(char * str) {
samux 4:466f90b7849a 217 char msg[strlen(str) + 15];
samux 4:466f90b7849a 218 int idx = 0;
samux 4:466f90b7849a 219 idx = sendOpcode(0x01, msg);
samux 4:466f90b7849a 220 idx += sendLength(strlen(str), msg + idx);
samux 4:466f90b7849a 221 idx += sendMask(msg + idx);
samux 4:466f90b7849a 222 memcpy(msg+idx, str, strlen(str));
samux 4:466f90b7849a 223 int res = write(msg, idx + strlen(str));
samux 3:9589afa4712e 224 return res;
samux 3:9589afa4712e 225 }
samux 3:9589afa4712e 226
samux 3:9589afa4712e 227
samux 3:9589afa4712e 228 bool Websocket::read(char * message) {
samux 3:9589afa4712e 229 int i = 0;
samux 3:9589afa4712e 230 uint32_t len_msg;
samux 3:9589afa4712e 231 char opcode = 0;
samux 3:9589afa4712e 232 char c;
samux 3:9589afa4712e 233 char mask[4] = {0, 0, 0, 0};
samux 3:9589afa4712e 234 bool is_masked = false;
samux 3:9589afa4712e 235 Timer tmr;
samux 3:9589afa4712e 236
samux 3:9589afa4712e 237 // read the opcode
samux 3:9589afa4712e 238 tmr.start();
samux 3:9589afa4712e 239 while (true) {
samux 3:9589afa4712e 240 if (tmr.read() > 3) {
samux 3:9589afa4712e 241 DBG("timeout ws\r\n");
samux 3:9589afa4712e 242 return false;
samux 3:9589afa4712e 243 }
donatien 5:bb09d7a6c92f 244
donatien 5:bb09d7a6c92f 245 if(!socket.is_connected())
donatien 5:bb09d7a6c92f 246 {
donatien 5:bb09d7a6c92f 247 WARN("Connection was closed by server");
donatien 5:bb09d7a6c92f 248 return false;
donatien 5:bb09d7a6c92f 249 }
samux 3:9589afa4712e 250
samux 3:9589afa4712e 251 socket.set_blocking(false, 1);
samux 3:9589afa4712e 252 if (socket.receive(&opcode, 1) != 1) {
samux 3:9589afa4712e 253 socket.set_blocking(false, 2000);
samux 3:9589afa4712e 254 return false;
samux 3:9589afa4712e 255 }
samux 3:9589afa4712e 256
samux 3:9589afa4712e 257 socket.set_blocking(false, 2000);
samux 3:9589afa4712e 258
samux 3:9589afa4712e 259 if (opcode == 0x81)
samux 3:9589afa4712e 260 break;
samux 3:9589afa4712e 261 }
samux 3:9589afa4712e 262 DBG("opcode: 0x%X\r\n", opcode);
samux 3:9589afa4712e 263
samux 3:9589afa4712e 264 readChar(&c);
samux 3:9589afa4712e 265 len_msg = c & 0x7f;
samux 3:9589afa4712e 266 is_masked = c & 0x80;
samux 3:9589afa4712e 267 if (len_msg == 126) {
samux 3:9589afa4712e 268 readChar(&c);
samux 3:9589afa4712e 269 len_msg = c << 8;
samux 3:9589afa4712e 270 readChar(&c);
samux 3:9589afa4712e 271 len_msg += c;
samux 3:9589afa4712e 272 } else if (len_msg == 127) {
samux 3:9589afa4712e 273 len_msg = 0;
samux 3:9589afa4712e 274 for (int i = 0; i < 8; i++) {
samux 3:9589afa4712e 275 readChar(&c);
samux 3:9589afa4712e 276 len_msg += (c << (7-i)*8);
samux 3:9589afa4712e 277 }
samux 3:9589afa4712e 278 }
samux 3:9589afa4712e 279
samux 3:9589afa4712e 280 if (len_msg == 0) {
samux 3:9589afa4712e 281 return false;
samux 3:9589afa4712e 282 }
samux 3:9589afa4712e 283 DBG("length: %d\r\n", len_msg);
samux 3:9589afa4712e 284
samux 3:9589afa4712e 285 if (is_masked) {
samux 3:9589afa4712e 286 for (i = 0; i < 4; i++)
samux 3:9589afa4712e 287 readChar(&c);
samux 3:9589afa4712e 288 mask[i] = c;
samux 3:9589afa4712e 289 }
samux 3:9589afa4712e 290
samux 3:9589afa4712e 291 int nb = read(message, len_msg, len_msg);
samux 3:9589afa4712e 292 if (nb != len_msg)
samux 3:9589afa4712e 293 return false;
samux 3:9589afa4712e 294
samux 3:9589afa4712e 295 for (i = 0; i < len_msg; i++) {
samux 3:9589afa4712e 296 message[i] = message[i] ^ mask[i % 4];
samux 3:9589afa4712e 297 }
samux 3:9589afa4712e 298
samux 3:9589afa4712e 299 message[len_msg] = '\0';
samux 3:9589afa4712e 300
samux 3:9589afa4712e 301 return true;
samux 3:9589afa4712e 302 }
samux 3:9589afa4712e 303
samux 3:9589afa4712e 304 bool Websocket::close() {
samux 3:9589afa4712e 305 if (!is_connected())
samux 3:9589afa4712e 306 return false;
samux 3:9589afa4712e 307
samux 3:9589afa4712e 308 int ret = socket.close();
samux 3:9589afa4712e 309 if (ret < 0) {
samux 3:9589afa4712e 310 ERR("Could not disconnect");
samux 3:9589afa4712e 311 return false;
samux 3:9589afa4712e 312 }
samux 3:9589afa4712e 313 return true;
samux 3:9589afa4712e 314 }
samux 3:9589afa4712e 315
samux 3:9589afa4712e 316 bool Websocket::is_connected() {
samux 3:9589afa4712e 317 return socket.is_connected();
samux 3:9589afa4712e 318 }
samux 3:9589afa4712e 319
donatien 6:86e89a0369b9 320 char* Websocket::getPath() {
samux 3:9589afa4712e 321 return path;
samux 3:9589afa4712e 322 }
samux 3:9589afa4712e 323
samux 3:9589afa4712e 324 int Websocket::write(char * str, int len) {
samux 3:9589afa4712e 325 int res = 0, idx = 0;
samux 3:9589afa4712e 326
samux 3:9589afa4712e 327 for (int j = 0; j < MAX_TRY_WRITE; j++) {
donatien 5:bb09d7a6c92f 328
donatien 5:bb09d7a6c92f 329 if(!socket.is_connected())
donatien 5:bb09d7a6c92f 330 {
donatien 5:bb09d7a6c92f 331 WARN("Connection was closed by server");
donatien 5:bb09d7a6c92f 332 break;
donatien 5:bb09d7a6c92f 333 }
samux 3:9589afa4712e 334
samux 3:9589afa4712e 335 if ((res = socket.send_all(str + idx, len - idx)) == -1)
samux 3:9589afa4712e 336 continue;
samux 3:9589afa4712e 337
samux 3:9589afa4712e 338 idx += res;
samux 3:9589afa4712e 339
samux 3:9589afa4712e 340 if (idx == len)
samux 3:9589afa4712e 341 return len;
samux 3:9589afa4712e 342 }
samux 3:9589afa4712e 343
samux 3:9589afa4712e 344 return (idx == 0) ? -1 : idx;
samux 3:9589afa4712e 345 }
samux 3:9589afa4712e 346
samux 3:9589afa4712e 347 int Websocket::read(char * str, int len, int min_len) {
samux 3:9589afa4712e 348 int res = 0, idx = 0;
samux 3:9589afa4712e 349
samux 3:9589afa4712e 350 for (int j = 0; j < MAX_TRY_WRITE; j++) {
samux 3:9589afa4712e 351
samux 3:9589afa4712e 352 if ((res = socket.receive_all(str + idx, len - idx)) == -1)
samux 3:9589afa4712e 353 continue;
samux 3:9589afa4712e 354
samux 3:9589afa4712e 355 idx += res;
samux 3:9589afa4712e 356
samux 3:9589afa4712e 357 if (idx == len || (min_len != -1 && idx > min_len))
samux 3:9589afa4712e 358 return idx;
samux 3:9589afa4712e 359 }
samux 3:9589afa4712e 360
samux 3:9589afa4712e 361 return (idx == 0) ? -1 : idx;
samux 3:9589afa4712e 362 }