KDDI Fx0 hackathon / WebSocketClient

Debug Version

Fork of WebSocketClient by Samuel Mokrani

Websocket.cpp@8:53d05ccff94a, 2015-02-14 (annotated)

Committer:
komoritan
Date:
Sat Feb 14 00:28:52 2015 +0000
Revision:
8:53d05ccff94a
Parent:
7:4567996414a5 
Customized

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
komoritan 8:53d05ccff94a 7 #if 1
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__);
samux 3:9589afa4712e 11 #else
samux 3:9589afa4712e 12 #define DBG(x, ...)
samux 3:9589afa4712e 13 #define WARN(x, ...)
samux 3:9589afa4712e 14 #define ERR(x, ...)
samux 3:9589afa4712e 15 #endif
samux 3:9589afa4712e 16
samux 3:9589afa4712e 17 #define INFO(x, ...) printf("[WebSocket : INFO]"x"\r\n", ##__VA_ARGS__);
samux 3:9589afa4712e 18
komoritan 8:53d05ccff94a 19 Websocket::Websocket(){
komoritan 8:53d05ccff94a 20 socket.set_blocking(false, 400);
komoritan 8:53d05ccff94a 21 }
samux 3:9589afa4712e 22 Websocket::Websocket(char * url) {
samux 3:9589afa4712e 23 fillFields(url);
samux 3:9589afa4712e 24 socket.set_blocking(false, 400);
samux 3:9589afa4712e 25 }
komoritan 8:53d05ccff94a 26 void Websocket::set_server(char* url){
komoritan 8:53d05ccff94a 27 fillFields(url);
komoritan 8:53d05ccff94a 28 socket.set_blocking(false, 400);
komoritan 8:53d05ccff94a 29 }
samux 3:9589afa4712e 30
samux 3:9589afa4712e 31 void Websocket::fillFields(char * url) {
donatien 6:86e89a0369b9 32 int ret = parseURL(url, scheme, sizeof(scheme), host, sizeof(host), &port, path, sizeof(path));
donatien 6:86e89a0369b9 33 if(ret)
donatien 6:86e89a0369b9 34 {
donatien 6:86e89a0369b9 35 ERR("URL parsing failed; please use: \"ws://ip-or-domain[:port]/path\"");
donatien 6:86e89a0369b9 36 return;
donatien 6:86e89a0369b9 37 }
samux 3:9589afa4712e 38
donatien 6:86e89a0369b9 39 if(port == 0) //TODO do handle WSS->443
donatien 6:86e89a0369b9 40 {
donatien 6:86e89a0369b9 41 port = 80;
donatien 6:86e89a0369b9 42 }
donatien 6:86e89a0369b9 43
donatien 6:86e89a0369b9 44 if(strcmp(scheme, "ws"))
donatien 6:86e89a0369b9 45 {
donatien 6:86e89a0369b9 46 ERR("Wrong scheme, please use \"ws\" instead");
donatien 6:86e89a0369b9 47 }
donatien 6:86e89a0369b9 48 }
samux 3:9589afa4712e 49
donatien 6:86e89a0369b9 50 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 51 {
donatien 6:86e89a0369b9 52 char* schemePtr = (char*) url;
donatien 6:86e89a0369b9 53 char* hostPtr = (char*) strstr(url, "://");
donatien 6:86e89a0369b9 54 if(hostPtr == NULL)
donatien 6:86e89a0369b9 55 {
donatien 6:86e89a0369b9 56 WARN("Could not find host");
donatien 6:86e89a0369b9 57 return -1; //URL is invalid
donatien 6:86e89a0369b9 58 }
donatien 6:86e89a0369b9 59
donatien 6:86e89a0369b9 60 if( maxSchemeLen < hostPtr - schemePtr + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 61 {
donatien 6:86e89a0369b9 62 WARN("Scheme str is too small (%d >= %d)", maxSchemeLen, hostPtr - schemePtr + 1);
donatien 6:86e89a0369b9 63 return -1;
donatien 6:86e89a0369b9 64 }
donatien 6:86e89a0369b9 65 memcpy(scheme, schemePtr, hostPtr - schemePtr);
donatien 6:86e89a0369b9 66 scheme[hostPtr - schemePtr] = '\0';
donatien 6:86e89a0369b9 67
donatien 6:86e89a0369b9 68 hostPtr+=3;
donatien 6:86e89a0369b9 69
donatien 6:86e89a0369b9 70 size_t hostLen = 0;
samux 3:9589afa4712e 71
donatien 6:86e89a0369b9 72 char* portPtr = strchr(hostPtr, ':');
donatien 6:86e89a0369b9 73 if( portPtr != NULL )
donatien 6:86e89a0369b9 74 {
donatien 6:86e89a0369b9 75 hostLen = portPtr - hostPtr;
donatien 6:86e89a0369b9 76 portPtr++;
donatien 6:86e89a0369b9 77 if( sscanf(portPtr, "%hu", port) != 1)
donatien 6:86e89a0369b9 78 {
donatien 6:86e89a0369b9 79 WARN("Could not find port");
donatien 6:86e89a0369b9 80 return -1;
donatien 6:86e89a0369b9 81 }
donatien 6:86e89a0369b9 82 }
donatien 6:86e89a0369b9 83 else
donatien 6:86e89a0369b9 84 {
donatien 6:86e89a0369b9 85 *port=0;
donatien 6:86e89a0369b9 86 }
donatien 6:86e89a0369b9 87 char* pathPtr = strchr(hostPtr, '/');
donatien 6:86e89a0369b9 88 if( hostLen == 0 )
donatien 6:86e89a0369b9 89 {
donatien 6:86e89a0369b9 90 hostLen = pathPtr - hostPtr;
donatien 6:86e89a0369b9 91 }
samux 3:9589afa4712e 92
donatien 6:86e89a0369b9 93 if( maxHostLen < hostLen + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 94 {
donatien 6:86e89a0369b9 95 WARN("Host str is too small (%d >= %d)", maxHostLen, hostLen + 1);
donatien 6:86e89a0369b9 96 return -1;
donatien 6:86e89a0369b9 97 }
donatien 6:86e89a0369b9 98 memcpy(host, hostPtr, hostLen);
donatien 6:86e89a0369b9 99 host[hostLen] = '\0';
samux 3:9589afa4712e 100
donatien 6:86e89a0369b9 101 size_t pathLen;
donatien 6:86e89a0369b9 102 char* fragmentPtr = strchr(hostPtr, '#');
donatien 6:86e89a0369b9 103 if(fragmentPtr != NULL)
donatien 6:86e89a0369b9 104 {
donatien 6:86e89a0369b9 105 pathLen = fragmentPtr - pathPtr;
donatien 6:86e89a0369b9 106 }
donatien 6:86e89a0369b9 107 else
donatien 6:86e89a0369b9 108 {
donatien 6:86e89a0369b9 109 pathLen = strlen(pathPtr);
donatien 6:86e89a0369b9 110 }
donatien 6:86e89a0369b9 111
donatien 6:86e89a0369b9 112 if( maxPathLen < pathLen + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 113 {
donatien 6:86e89a0369b9 114 WARN("Path str is too small (%d >= %d)", maxPathLen, pathLen + 1);
donatien 6:86e89a0369b9 115 return -1;
donatien 6:86e89a0369b9 116 }
donatien 6:86e89a0369b9 117 memcpy(path, pathPtr, pathLen);
donatien 6:86e89a0369b9 118 path[pathLen] = '\0';
donatien 6:86e89a0369b9 119
donatien 6:86e89a0369b9 120 return 0;
samux 3:9589afa4712e 121 }
samux 3:9589afa4712e 122
samux 3:9589afa4712e 123
samux 3:9589afa4712e 124 bool Websocket::connect() {
samux 3:9589afa4712e 125 char cmd[200];
samux 3:9589afa4712e 126
donatien 6:86e89a0369b9 127 while (socket.connect(host, port) < 0) {
donatien 6:86e89a0369b9 128 ERR("Unable to connect to (%s) on port (%d)", host, port);
samux 3:9589afa4712e 129 wait(0.2);
donatien 6:86e89a0369b9 130 return false;
samux 3:9589afa4712e 131 }
samux 3:9589afa4712e 132
samux 3:9589afa4712e 133 // sent http header to upgrade to the ws protocol
donatien 6:86e89a0369b9 134 sprintf(cmd, "GET %s HTTP/1.1\r\n", path);
samux 3:9589afa4712e 135 write(cmd, strlen(cmd));
donatien 6:86e89a0369b9 136
donatien 6:86e89a0369b9 137 sprintf(cmd, "Host: %s:%d\r\n", host, port);
samux 3:9589afa4712e 138 write(cmd, strlen(cmd));
samux 3:9589afa4712e 139
samux 3:9589afa4712e 140 sprintf(cmd, "Upgrade: WebSocket\r\n");
samux 3:9589afa4712e 141 write(cmd, strlen(cmd));
samux 3:9589afa4712e 142
samux 3:9589afa4712e 143 sprintf(cmd, "Connection: Upgrade\r\n");
samux 3:9589afa4712e 144 write(cmd, strlen(cmd));
samux 3:9589afa4712e 145
samux 3:9589afa4712e 146 sprintf(cmd, "Sec-WebSocket-Key: L159VM0TWUzyDxwJEIEzjw==\r\n");
samux 3:9589afa4712e 147 write(cmd, strlen(cmd));
samux 3:9589afa4712e 148
samux 3:9589afa4712e 149 sprintf(cmd, "Sec-WebSocket-Version: 13\r\n\r\n");
samux 3:9589afa4712e 150 int ret = write(cmd, strlen(cmd));
samux 3:9589afa4712e 151 if (ret != strlen(cmd)) {
samux 3:9589afa4712e 152 close();
samux 3:9589afa4712e 153 ERR("Could not send request");
samux 3:9589afa4712e 154 return false;
samux 3:9589afa4712e 155 }
samux 3:9589afa4712e 156
samux 3:9589afa4712e 157 ret = read(cmd, 200, 100);
samux 3:9589afa4712e 158 if (ret < 0) {
samux 3:9589afa4712e 159 close();
samux 3:9589afa4712e 160 ERR("Could not receive answer\r\n");
samux 3:9589afa4712e 161 return false;
samux 3:9589afa4712e 162 }
samux 3:9589afa4712e 163
samux 3:9589afa4712e 164 cmd[ret] = '\0';
samux 3:9589afa4712e 165 DBG("recv: %s\r\n", cmd);
samux 3:9589afa4712e 166
samux 3:9589afa4712e 167 if ( strstr(cmd, "DdLWT/1JcX+nQFHebYP+rqEx5xI=") == NULL ) {
samux 3:9589afa4712e 168 ERR("Wrong answer from server, got \"%s\" instead\r\n", cmd);
samux 3:9589afa4712e 169 do {
samux 3:9589afa4712e 170 ret = read(cmd, 200, 100);
samux 3:9589afa4712e 171 if (ret < 0) {
samux 3:9589afa4712e 172 ERR("Could not receive answer\r\n");
samux 3:9589afa4712e 173 return false;
samux 3:9589afa4712e 174 }
samux 3:9589afa4712e 175 cmd[ret] = '\0';
samux 3:9589afa4712e 176 printf("%s",cmd);
samux 3:9589afa4712e 177 } while (ret > 0);
samux 3:9589afa4712e 178 close();
samux 3:9589afa4712e 179 return false;
samux 3:9589afa4712e 180 }
samux 3:9589afa4712e 181
donatien 6:86e89a0369b9 182 INFO("\r\nhost: %s\r\npath: %s\r\nport: %d\r\n\r\n", host, path, port);
samux 3:9589afa4712e 183 return true;
samux 3:9589afa4712e 184 }
samux 3:9589afa4712e 185
samux 4:466f90b7849a 186 int Websocket::sendLength(uint32_t len, char * msg) {
samux 3:9589afa4712e 187
samux 3:9589afa4712e 188 if (len < 126) {
samux 4:466f90b7849a 189 msg[0] = len | (1<<7);
samux 3:9589afa4712e 190 return 1;
samux 3:9589afa4712e 191 } else if (len < 65535) {
samux 4:466f90b7849a 192 msg[0] = 126 | (1<<7);
samux 4:466f90b7849a 193 msg[1] = (len >> 8) & 0xff;
samux 4:466f90b7849a 194 msg[2] = len & 0xff;
samux 3:9589afa4712e 195 return 3;
samux 3:9589afa4712e 196 } else {
samux 4:466f90b7849a 197 msg[0] = 127 | (1<<7);
samux 3:9589afa4712e 198 for (int i = 0; i < 8; i++) {
samux 4:466f90b7849a 199 msg[i+1] = (len >> i*8) & 0xff;
samux 3:9589afa4712e 200 }
samux 3:9589afa4712e 201 return 9;
samux 3:9589afa4712e 202 }
samux 3:9589afa4712e 203 }
samux 3:9589afa4712e 204
samux 3:9589afa4712e 205 int Websocket::readChar(char * pC, bool block) {
samux 3:9589afa4712e 206 return read(pC, 1, 1);
samux 3:9589afa4712e 207 }
samux 3:9589afa4712e 208
samux 4:466f90b7849a 209 int Websocket::sendOpcode(uint8_t opcode, char * msg) {
samux 4:466f90b7849a 210 msg[0] = 0x80 | (opcode & 0x0f);
samux 4:466f90b7849a 211 return 1;
samux 3:9589afa4712e 212 }
samux 3:9589afa4712e 213
samux 4:466f90b7849a 214 int Websocket::sendMask(char * msg) {
samux 3:9589afa4712e 215 for (int i = 0; i < 4; i++) {
samux 4:466f90b7849a 216 msg[i] = 0;
samux 3:9589afa4712e 217 }
samux 3:9589afa4712e 218 return 4;
samux 3:9589afa4712e 219 }
samux 3:9589afa4712e 220
samux 3:9589afa4712e 221 int Websocket::send(char * str) {
samux 4:466f90b7849a 222 char msg[strlen(str) + 15];
samux 4:466f90b7849a 223 int idx = 0;
samux 4:466f90b7849a 224 idx = sendOpcode(0x01, msg);
samux 4:466f90b7849a 225 idx += sendLength(strlen(str), msg + idx);
samux 4:466f90b7849a 226 idx += sendMask(msg + idx);
samux 4:466f90b7849a 227 memcpy(msg+idx, str, strlen(str));
samux 4:466f90b7849a 228 int res = write(msg, idx + strlen(str));
samux 3:9589afa4712e 229 return res;
samux 3:9589afa4712e 230 }
samux 3:9589afa4712e 231
samux 3:9589afa4712e 232
samux 3:9589afa4712e 233 bool Websocket::read(char * message) {
samux 3:9589afa4712e 234 int i = 0;
samux 3:9589afa4712e 235 uint32_t len_msg;
samux 3:9589afa4712e 236 char opcode = 0;
samux 3:9589afa4712e 237 char c;
samux 3:9589afa4712e 238 char mask[4] = {0, 0, 0, 0};
samux 3:9589afa4712e 239 bool is_masked = false;
samux 3:9589afa4712e 240 Timer tmr;
samux 3:9589afa4712e 241
samux 3:9589afa4712e 242 // read the opcode
samux 3:9589afa4712e 243 tmr.start();
samux 3:9589afa4712e 244 while (true) {
samux 3:9589afa4712e 245 if (tmr.read() > 3) {
samux 3:9589afa4712e 246 DBG("timeout ws\r\n");
samux 3:9589afa4712e 247 return false;
samux 3:9589afa4712e 248 }
donatien 5:bb09d7a6c92f 249
donatien 5:bb09d7a6c92f 250 if(!socket.is_connected())
donatien 5:bb09d7a6c92f 251 {
donatien 5:bb09d7a6c92f 252 WARN("Connection was closed by server");
donatien 5:bb09d7a6c92f 253 return false;
donatien 5:bb09d7a6c92f 254 }
samux 3:9589afa4712e 255
samux 3:9589afa4712e 256 socket.set_blocking(false, 1);
samux 3:9589afa4712e 257 if (socket.receive(&opcode, 1) != 1) {
samux 3:9589afa4712e 258 socket.set_blocking(false, 2000);
samux 3:9589afa4712e 259 return false;
samux 3:9589afa4712e 260 }
samux 3:9589afa4712e 261
samux 3:9589afa4712e 262 socket.set_blocking(false, 2000);
samux 3:9589afa4712e 263
samux 3:9589afa4712e 264 if (opcode == 0x81)
samux 3:9589afa4712e 265 break;
samux 3:9589afa4712e 266 }
samux 3:9589afa4712e 267 DBG("opcode: 0x%X\r\n", opcode);
samux 3:9589afa4712e 268
samux 3:9589afa4712e 269 readChar(&c);
samux 3:9589afa4712e 270 len_msg = c & 0x7f;
samux 3:9589afa4712e 271 is_masked = c & 0x80;
samux 3:9589afa4712e 272 if (len_msg == 126) {
samux 3:9589afa4712e 273 readChar(&c);
samux 3:9589afa4712e 274 len_msg = c << 8;
samux 3:9589afa4712e 275 readChar(&c);
samux 3:9589afa4712e 276 len_msg += c;
samux 3:9589afa4712e 277 } else if (len_msg == 127) {
samux 3:9589afa4712e 278 len_msg = 0;
samux 3:9589afa4712e 279 for (int i = 0; i < 8; i++) {
samux 3:9589afa4712e 280 readChar(&c);
samux 3:9589afa4712e 281 len_msg += (c << (7-i)*8);
samux 3:9589afa4712e 282 }
samux 3:9589afa4712e 283 }
samux 3:9589afa4712e 284
samux 3:9589afa4712e 285 if (len_msg == 0) {
samux 3:9589afa4712e 286 return false;
samux 3:9589afa4712e 287 }
samux 3:9589afa4712e 288 DBG("length: %d\r\n", len_msg);
samux 3:9589afa4712e 289
samux 3:9589afa4712e 290 if (is_masked) {
samux 3:9589afa4712e 291 for (i = 0; i < 4; i++)
samux 3:9589afa4712e 292 readChar(&c);
samux 3:9589afa4712e 293 mask[i] = c;
samux 3:9589afa4712e 294 }
samux 3:9589afa4712e 295
samux 3:9589afa4712e 296 int nb = read(message, len_msg, len_msg);
samux 3:9589afa4712e 297 if (nb != len_msg)
samux 3:9589afa4712e 298 return false;
samux 3:9589afa4712e 299
samux 3:9589afa4712e 300 for (i = 0; i < len_msg; i++) {
samux 3:9589afa4712e 301 message[i] = message[i] ^ mask[i % 4];
samux 3:9589afa4712e 302 }
samux 3:9589afa4712e 303
samux 3:9589afa4712e 304 message[len_msg] = '\0';
samux 3:9589afa4712e 305
samux 3:9589afa4712e 306 return true;
samux 3:9589afa4712e 307 }
samux 3:9589afa4712e 308
samux 3:9589afa4712e 309 bool Websocket::close() {
samux 3:9589afa4712e 310 if (!is_connected())
samux 3:9589afa4712e 311 return false;
samux 3:9589afa4712e 312
samux 3:9589afa4712e 313 int ret = socket.close();
samux 3:9589afa4712e 314 if (ret < 0) {
samux 3:9589afa4712e 315 ERR("Could not disconnect");
samux 3:9589afa4712e 316 return false;
samux 3:9589afa4712e 317 }
samux 3:9589afa4712e 318 return true;
samux 3:9589afa4712e 319 }
samux 3:9589afa4712e 320
samux 3:9589afa4712e 321 bool Websocket::is_connected() {
samux 3:9589afa4712e 322 return socket.is_connected();
samux 3:9589afa4712e 323 }
samux 3:9589afa4712e 324
donatien 6:86e89a0369b9 325 char* Websocket::getPath() {
samux 3:9589afa4712e 326 return path;
samux 3:9589afa4712e 327 }
samux 3:9589afa4712e 328
samux 3:9589afa4712e 329 int Websocket::write(char * str, int len) {
samux 3:9589afa4712e 330 int res = 0, idx = 0;
samux 3:9589afa4712e 331
samux 3:9589afa4712e 332 for (int j = 0; j < MAX_TRY_WRITE; j++) {
donatien 5:bb09d7a6c92f 333
donatien 5:bb09d7a6c92f 334 if(!socket.is_connected())
donatien 5:bb09d7a6c92f 335 {
donatien 5:bb09d7a6c92f 336 WARN("Connection was closed by server");
donatien 5:bb09d7a6c92f 337 break;
donatien 5:bb09d7a6c92f 338 }
samux 3:9589afa4712e 339
samux 3:9589afa4712e 340 if ((res = socket.send_all(str + idx, len - idx)) == -1)
samux 3:9589afa4712e 341 continue;
samux 3:9589afa4712e 342
samux 3:9589afa4712e 343 idx += res;
samux 3:9589afa4712e 344
samux 3:9589afa4712e 345 if (idx == len)
samux 3:9589afa4712e 346 return len;
samux 3:9589afa4712e 347 }
samux 3:9589afa4712e 348
samux 3:9589afa4712e 349 return (idx == 0) ? -1 : idx;
samux 3:9589afa4712e 350 }
samux 3:9589afa4712e 351
samux 3:9589afa4712e 352 int Websocket::read(char * str, int len, int min_len) {
samux 3:9589afa4712e 353 int res = 0, idx = 0;
samux 3:9589afa4712e 354
samux 3:9589afa4712e 355 for (int j = 0; j < MAX_TRY_WRITE; j++) {
samux 3:9589afa4712e 356
samux 3:9589afa4712e 357 if ((res = socket.receive_all(str + idx, len - idx)) == -1)
samux 3:9589afa4712e 358 continue;
samux 3:9589afa4712e 359
samux 3:9589afa4712e 360 idx += res;
samux 3:9589afa4712e 361
samux 3:9589afa4712e 362 if (idx == len || (min_len != -1 && idx > min_len))
samux 3:9589afa4712e 363 return idx;
samux 3:9589afa4712e 364 }
samux 3:9589afa4712e 365
samux 3:9589afa4712e 366 return (idx == 0) ? -1 : idx;
samux 3:9589afa4712e 367 }