Scott Vincent / WebSocketClient

update

Websocket.cpp@11:42e786972903, 2021-03-10 (annotated)

Committer:
jump_man
Date:
Wed Mar 10 17:03:33 2021 +0000
Revision:
11:42e786972903
Parent:
10:521a8bb6eabf 
update

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
samux 3:9589afa4712e 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__);
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
mbed_official 9:efa2c147bee1 19 Websocket::Websocket(char * url, NetworkInterface * iface) {
samux 3:9589afa4712e 20 fillFields(url);
adamvincent 10:521a8bb6eabf 21 iface->get_ip_address(&add);
adamvincent 10:521a8bb6eabf 22 iface->gethostbyname(host, &add);
adamvincent 10:521a8bb6eabf 23 add.set_port(port);
mbed_official 9:efa2c147bee1 24 socket.open(iface);
mbed_official 9:efa2c147bee1 25 socket.set_timeout(400);
samux 3:9589afa4712e 26 }
samux 3:9589afa4712e 27
samux 3:9589afa4712e 28 void Websocket::fillFields(char * url) {
donatien 6:86e89a0369b9 29 int ret = parseURL(url, scheme, sizeof(scheme), host, sizeof(host), &port, path, sizeof(path));
donatien 6:86e89a0369b9 30 if(ret)
donatien 6:86e89a0369b9 31 {
donatien 6:86e89a0369b9 32 ERR("URL parsing failed; please use: \"ws://ip-or-domain[:port]/path\"");
donatien 6:86e89a0369b9 33 return;
donatien 6:86e89a0369b9 34 }
samux 3:9589afa4712e 35
donatien 6:86e89a0369b9 36 if(port == 0) //TODO do handle WSS->443
donatien 6:86e89a0369b9 37 {
donatien 6:86e89a0369b9 38 port = 80;
donatien 6:86e89a0369b9 39 }
donatien 6:86e89a0369b9 40
donatien 6:86e89a0369b9 41 if(strcmp(scheme, "ws"))
donatien 6:86e89a0369b9 42 {
donatien 6:86e89a0369b9 43 ERR("Wrong scheme, please use \"ws\" instead");
donatien 6:86e89a0369b9 44 }
donatien 6:86e89a0369b9 45 }
samux 3:9589afa4712e 46
donatien 6:86e89a0369b9 47 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 48 {
donatien 6:86e89a0369b9 49 char* schemePtr = (char*) url;
donatien 6:86e89a0369b9 50 char* hostPtr = (char*) strstr(url, "://");
donatien 6:86e89a0369b9 51 if(hostPtr == NULL)
donatien 6:86e89a0369b9 52 {
donatien 6:86e89a0369b9 53 WARN("Could not find host");
donatien 6:86e89a0369b9 54 return -1; //URL is invalid
donatien 6:86e89a0369b9 55 }
donatien 6:86e89a0369b9 56
donatien 6:86e89a0369b9 57 if( maxSchemeLen < hostPtr - schemePtr + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 58 {
donatien 6:86e89a0369b9 59 WARN("Scheme str is too small (%d >= %d)", maxSchemeLen, hostPtr - schemePtr + 1);
donatien 6:86e89a0369b9 60 return -1;
donatien 6:86e89a0369b9 61 }
donatien 6:86e89a0369b9 62 memcpy(scheme, schemePtr, hostPtr - schemePtr);
donatien 6:86e89a0369b9 63 scheme[hostPtr - schemePtr] = '\0';
donatien 6:86e89a0369b9 64
donatien 6:86e89a0369b9 65 hostPtr+=3;
donatien 6:86e89a0369b9 66
donatien 6:86e89a0369b9 67 size_t hostLen = 0;
samux 3:9589afa4712e 68
donatien 6:86e89a0369b9 69 char* portPtr = strchr(hostPtr, ':');
donatien 6:86e89a0369b9 70 if( portPtr != NULL )
donatien 6:86e89a0369b9 71 {
donatien 6:86e89a0369b9 72 hostLen = portPtr - hostPtr;
donatien 6:86e89a0369b9 73 portPtr++;
donatien 6:86e89a0369b9 74 if( sscanf(portPtr, "%hu", port) != 1)
donatien 6:86e89a0369b9 75 {
donatien 6:86e89a0369b9 76 WARN("Could not find port");
donatien 6:86e89a0369b9 77 return -1;
donatien 6:86e89a0369b9 78 }
donatien 6:86e89a0369b9 79 }
donatien 6:86e89a0369b9 80 else
donatien 6:86e89a0369b9 81 {
donatien 6:86e89a0369b9 82 *port=0;
donatien 6:86e89a0369b9 83 }
donatien 6:86e89a0369b9 84 char* pathPtr = strchr(hostPtr, '/');
mbed_official 9:efa2c147bee1 85 if(pathPtr == NULL)
mbed_official 9:efa2c147bee1 86 {
mbed_official 9:efa2c147bee1 87 WARN("Path not specified. Please add /[path] to the end of the websocket address");
mbed_official 9:efa2c147bee1 88 return -1;
mbed_official 9:efa2c147bee1 89 }
donatien 6:86e89a0369b9 90 if( hostLen == 0 )
donatien 6:86e89a0369b9 91 {
donatien 6:86e89a0369b9 92 hostLen = pathPtr - hostPtr;
donatien 6:86e89a0369b9 93 }
samux 3:9589afa4712e 94
donatien 6:86e89a0369b9 95 if( maxHostLen < hostLen + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 96 {
donatien 6:86e89a0369b9 97 WARN("Host str is too small (%d >= %d)", maxHostLen, hostLen + 1);
donatien 6:86e89a0369b9 98 return -1;
donatien 6:86e89a0369b9 99 }
donatien 6:86e89a0369b9 100 memcpy(host, hostPtr, hostLen);
donatien 6:86e89a0369b9 101 host[hostLen] = '\0';
samux 3:9589afa4712e 102
donatien 6:86e89a0369b9 103 size_t pathLen;
donatien 6:86e89a0369b9 104 char* fragmentPtr = strchr(hostPtr, '#');
donatien 6:86e89a0369b9 105 if(fragmentPtr != NULL)
donatien 6:86e89a0369b9 106 {
donatien 6:86e89a0369b9 107 pathLen = fragmentPtr - pathPtr;
donatien 6:86e89a0369b9 108 }
donatien 6:86e89a0369b9 109 else
donatien 6:86e89a0369b9 110 {
donatien 6:86e89a0369b9 111 pathLen = strlen(pathPtr);
donatien 6:86e89a0369b9 112 }
donatien 6:86e89a0369b9 113
donatien 6:86e89a0369b9 114 if( maxPathLen < pathLen + 1 ) //including NULL-terminating char
donatien 6:86e89a0369b9 115 {
donatien 6:86e89a0369b9 116 WARN("Path str is too small (%d >= %d)", maxPathLen, pathLen + 1);
donatien 6:86e89a0369b9 117 return -1;
donatien 6:86e89a0369b9 118 }
donatien 6:86e89a0369b9 119 memcpy(path, pathPtr, pathLen);
donatien 6:86e89a0369b9 120 path[pathLen] = '\0';
donatien 6:86e89a0369b9 121
donatien 6:86e89a0369b9 122 return 0;
samux 3:9589afa4712e 123 }
samux 3:9589afa4712e 124
samux 3:9589afa4712e 125
samux 3:9589afa4712e 126 bool Websocket::connect() {
samux 3:9589afa4712e 127 char cmd[200];
samux 3:9589afa4712e 128
adamvincent 10:521a8bb6eabf 129 while (socket.connect(add) < 0) {
donatien 6:86e89a0369b9 130 ERR("Unable to connect to (%s) on port (%d)", host, port);
adamvincent 10:521a8bb6eabf 131 wait_us(200);
donatien 6:86e89a0369b9 132 return false;
samux 3:9589afa4712e 133 }
samux 3:9589afa4712e 134
samux 3:9589afa4712e 135 // sent http header to upgrade to the ws protocol
donatien 6:86e89a0369b9 136 sprintf(cmd, "GET %s HTTP/1.1\r\n", path);
samux 3:9589afa4712e 137 write(cmd, strlen(cmd));
donatien 6:86e89a0369b9 138
donatien 6:86e89a0369b9 139 sprintf(cmd, "Host: %s:%d\r\n", host, port);
samux 3:9589afa4712e 140 write(cmd, strlen(cmd));
samux 3:9589afa4712e 141
samux 3:9589afa4712e 142 sprintf(cmd, "Upgrade: WebSocket\r\n");
samux 3:9589afa4712e 143 write(cmd, strlen(cmd));
samux 3:9589afa4712e 144
samux 3:9589afa4712e 145 sprintf(cmd, "Connection: Upgrade\r\n");
samux 3:9589afa4712e 146 write(cmd, strlen(cmd));
samux 3:9589afa4712e 147
samux 3:9589afa4712e 148 sprintf(cmd, "Sec-WebSocket-Key: L159VM0TWUzyDxwJEIEzjw==\r\n");
samux 3:9589afa4712e 149 write(cmd, strlen(cmd));
samux 3:9589afa4712e 150
samux 3:9589afa4712e 151 sprintf(cmd, "Sec-WebSocket-Version: 13\r\n\r\n");
samux 3:9589afa4712e 152 int ret = write(cmd, strlen(cmd));
samux 3:9589afa4712e 153 if (ret != strlen(cmd)) {
samux 3:9589afa4712e 154 close();
samux 3:9589afa4712e 155 ERR("Could not send request");
samux 3:9589afa4712e 156 return false;
samux 3:9589afa4712e 157 }
samux 3:9589afa4712e 158
samux 3:9589afa4712e 159 ret = read(cmd, 200, 100);
samux 3:9589afa4712e 160 if (ret < 0) {
samux 3:9589afa4712e 161 close();
samux 3:9589afa4712e 162 ERR("Could not receive answer\r\n");
samux 3:9589afa4712e 163 return false;
samux 3:9589afa4712e 164 }
samux 3:9589afa4712e 165
samux 3:9589afa4712e 166 cmd[ret] = '\0';
samux 3:9589afa4712e 167 DBG("recv: %s\r\n", cmd);
samux 3:9589afa4712e 168
samux 3:9589afa4712e 169 if ( strstr(cmd, "DdLWT/1JcX+nQFHebYP+rqEx5xI=") == NULL ) {
samux 3:9589afa4712e 170 ERR("Wrong answer from server, got \"%s\" instead\r\n", cmd);
samux 3:9589afa4712e 171 do {
samux 3:9589afa4712e 172 ret = read(cmd, 200, 100);
samux 3:9589afa4712e 173 if (ret < 0) {
samux 3:9589afa4712e 174 ERR("Could not receive answer\r\n");
samux 3:9589afa4712e 175 return false;
samux 3:9589afa4712e 176 }
samux 3:9589afa4712e 177 cmd[ret] = '\0';
samux 3:9589afa4712e 178 } while (ret > 0);
samux 3:9589afa4712e 179 close();
samux 3:9589afa4712e 180 return false;
samux 3:9589afa4712e 181 }
samux 3:9589afa4712e 182
jump_man 11:42e786972903 183 //INFO("\r\nhost: %s\r\npath: %s\r\nport: %d\r\n\r\n", host, path, port);
samux 3:9589afa4712e 184 return true;
samux 3:9589afa4712e 185 }
samux 3:9589afa4712e 186
samux 4:466f90b7849a 187 int Websocket::sendLength(uint32_t len, char * msg) {
samux 3:9589afa4712e 188
samux 3:9589afa4712e 189 if (len < 126) {
samux 4:466f90b7849a 190 msg[0] = len | (1<<7);
samux 3:9589afa4712e 191 return 1;
samux 3:9589afa4712e 192 } else if (len < 65535) {
samux 4:466f90b7849a 193 msg[0] = 126 | (1<<7);
samux 4:466f90b7849a 194 msg[1] = (len >> 8) & 0xff;
samux 4:466f90b7849a 195 msg[2] = len & 0xff;
samux 3:9589afa4712e 196 return 3;
samux 3:9589afa4712e 197 } else {
samux 4:466f90b7849a 198 msg[0] = 127 | (1<<7);
samux 3:9589afa4712e 199 for (int i = 0; i < 8; i++) {
samux 4:466f90b7849a 200 msg[i+1] = (len >> i*8) & 0xff;
samux 3:9589afa4712e 201 }
samux 3:9589afa4712e 202 return 9;
samux 3:9589afa4712e 203 }
samux 3:9589afa4712e 204 }
samux 3:9589afa4712e 205
samux 3:9589afa4712e 206 int Websocket::readChar(char * pC, bool block) {
samux 3:9589afa4712e 207 return read(pC, 1, 1);
samux 3:9589afa4712e 208 }
samux 3:9589afa4712e 209
samux 4:466f90b7849a 210 int Websocket::sendOpcode(uint8_t opcode, char * msg) {
samux 4:466f90b7849a 211 msg[0] = 0x80 | (opcode & 0x0f);
samux 4:466f90b7849a 212 return 1;
samux 3:9589afa4712e 213 }
samux 3:9589afa4712e 214
samux 4:466f90b7849a 215 int Websocket::sendMask(char * msg) {
samux 3:9589afa4712e 216 for (int i = 0; i < 4; i++) {
samux 4:466f90b7849a 217 msg[i] = 0;
samux 3:9589afa4712e 218 }
samux 3:9589afa4712e 219 return 4;
samux 3:9589afa4712e 220 }
samux 3:9589afa4712e 221
samux 3:9589afa4712e 222 int Websocket::send(char * str) {
samux 4:466f90b7849a 223 char msg[strlen(str) + 15];
samux 4:466f90b7849a 224 int idx = 0;
samux 4:466f90b7849a 225 idx = sendOpcode(0x01, msg);
samux 4:466f90b7849a 226 idx += sendLength(strlen(str), msg + idx);
samux 4:466f90b7849a 227 idx += sendMask(msg + idx);
samux 4:466f90b7849a 228 memcpy(msg+idx, str, strlen(str));
samux 4:466f90b7849a 229 int res = write(msg, idx + strlen(str));
samux 3:9589afa4712e 230 return res;
samux 3:9589afa4712e 231 }
samux 3:9589afa4712e 232
samux 3:9589afa4712e 233
samux 3:9589afa4712e 234 bool Websocket::read(char * message) {
samux 3:9589afa4712e 235 int i = 0;
samux 3:9589afa4712e 236 uint32_t len_msg;
samux 3:9589afa4712e 237 char opcode = 0;
samux 3:9589afa4712e 238 char c;
samux 3:9589afa4712e 239 char mask[4] = {0, 0, 0, 0};
samux 3:9589afa4712e 240 bool is_masked = false;
samux 3:9589afa4712e 241 Timer tmr;
samux 3:9589afa4712e 242
samux 3:9589afa4712e 243 // read the opcode
samux 3:9589afa4712e 244 tmr.start();
samux 3:9589afa4712e 245 while (true) {
samux 3:9589afa4712e 246 if (tmr.read() > 3) {
samux 3:9589afa4712e 247 DBG("timeout ws\r\n");
samux 3:9589afa4712e 248 return false;
samux 3:9589afa4712e 249 }
mbed_official 9:efa2c147bee1 250
mbed_official 9:efa2c147bee1 251 socket.set_timeout(1);
mbed_official 9:efa2c147bee1 252 if (socket.recv(&opcode, 1) != 1) {
mbed_official 9:efa2c147bee1 253 socket.set_timeout(2000);
donatien 5:bb09d7a6c92f 254 return false;
donatien 5:bb09d7a6c92f 255 }
samux 3:9589afa4712e 256
mbed_official 9:efa2c147bee1 257 socket.set_timeout(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) {
mbed_official 9:efa2c147bee1 286 for (i = 0; i < 4; i++) {
mbed_official 9:efa2c147bee1 287 readChar(&c);
mbed_official 9:efa2c147bee1 288 mask[i] = c;
mbed_official 9:efa2c147bee1 289 }
samux 3:9589afa4712e 290 }
samux 3:9589afa4712e 291
samux 3:9589afa4712e 292 int nb = read(message, len_msg, len_msg);
samux 3:9589afa4712e 293 if (nb != len_msg)
samux 3:9589afa4712e 294 return false;
samux 3:9589afa4712e 295
samux 3:9589afa4712e 296 for (i = 0; i < len_msg; i++) {
samux 3:9589afa4712e 297 message[i] = message[i] ^ mask[i % 4];
samux 3:9589afa4712e 298 }
samux 3:9589afa4712e 299
samux 3:9589afa4712e 300 message[len_msg] = '\0';
samux 3:9589afa4712e 301
samux 3:9589afa4712e 302 return true;
samux 3:9589afa4712e 303 }
samux 3:9589afa4712e 304
samux 3:9589afa4712e 305 bool Websocket::close() {
samux 3:9589afa4712e 306
samux 3:9589afa4712e 307 int ret = socket.close();
samux 3:9589afa4712e 308 if (ret < 0) {
samux 3:9589afa4712e 309 ERR("Could not disconnect");
samux 3:9589afa4712e 310 return false;
samux 3:9589afa4712e 311 }
samux 3:9589afa4712e 312 return true;
samux 3:9589afa4712e 313 }
samux 3:9589afa4712e 314
donatien 6:86e89a0369b9 315 char* Websocket::getPath() {
samux 3:9589afa4712e 316 return path;
samux 3:9589afa4712e 317 }
samux 3:9589afa4712e 318
samux 3:9589afa4712e 319 int Websocket::write(char * str, int len) {
samux 3:9589afa4712e 320 int res = 0, idx = 0;
samux 3:9589afa4712e 321
samux 3:9589afa4712e 322 for (int j = 0; j < MAX_TRY_WRITE; j++) {
samux 3:9589afa4712e 323
mbed_official 9:efa2c147bee1 324 if ((res = socket.send(str + idx, len - idx)) < 0)
samux 3:9589afa4712e 325 continue;
samux 3:9589afa4712e 326
samux 3:9589afa4712e 327 idx += res;
samux 3:9589afa4712e 328
samux 3:9589afa4712e 329 if (idx == len)
samux 3:9589afa4712e 330 return len;
samux 3:9589afa4712e 331 }
samux 3:9589afa4712e 332
samux 3:9589afa4712e 333 return (idx == 0) ? -1 : idx;
samux 3:9589afa4712e 334 }
samux 3:9589afa4712e 335
samux 3:9589afa4712e 336 int Websocket::read(char * str, int len, int min_len) {
samux 3:9589afa4712e 337 int res = 0, idx = 0;
samux 3:9589afa4712e 338
samux 3:9589afa4712e 339 for (int j = 0; j < MAX_TRY_WRITE; j++) {
samux 3:9589afa4712e 340
mbed_official 9:efa2c147bee1 341 if ((res = socket.recv(str + idx, len - idx)) < 0)
mbed_official 9:efa2c147bee1 342 continue;
samux 3:9589afa4712e 343
samux 3:9589afa4712e 344 idx += res;
samux 3:9589afa4712e 345
samux 3:9589afa4712e 346 if (idx == len || (min_len != -1 && idx > min_len))
samux 3:9589afa4712e 347 return idx;
samux 3:9589afa4712e 348 }
samux 3:9589afa4712e 349
samux 3:9589afa4712e 350 return (idx == 0) ? -1 : idx;
samux 3:9589afa4712e 351 }