fork of WebSocketClient with some fixes
Fork of WebSocketClient by
Diff: Websocket.cpp
- Revision:
- 0:10b6eaafc2da
- Child:
- 1:de85cd4ec77b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Websocket.cpp Fri Aug 10 11:08:44 2012 +0000 @@ -0,0 +1,302 @@ +#include "Websocket.h" +#include <string> + +#define MAX_TRY_WRITE 5 +#define MAX_TRY_READ 3 + +//#define DEBUG + +Websocket::Websocket(char * url) { + fillFields(url); + socket.set_blocking(false, 2000); +} + +void Websocket::fillFields(char * url) { + char *res = NULL; + char *res1 = NULL; + + char buf[50]; + strcpy(buf, url); + + res = strtok(buf, ":"); + if (strcmp(res, "ws")) { +#ifdef DEBUG + printf("\r\nFormat printfor: please use: \"ws://ip-or-domain[:port]/path\"\r\n\r\n"); +#endif + } else { + //ip_domain and port + res = strtok(NULL, "/"); + + //path + res1 = strtok(NULL, " "); + if (res1 != NULL) { + path = res1; + } + + //ip_domain + res = strtok(res, ":"); + + //port + res1 = strtok(NULL, " "); + if (res1 != NULL) { + port = res1; + } else { + port = "80"; + } + + if (res != NULL) { + ip_domain = res; + } + } +} + + +bool Websocket::connect() { + char cmd[192]; + + while (socket.connect(ip_domain.c_str(), atoi(port.c_str())) < 0) { + printf("Unable to connect to (%s) on port (%d)\r\n", ip_domain.c_str(), atoi(port.c_str())); + wait(0.2); + } + + // sent http header to upgrade to the ws protocol + sprintf(cmd, "GET /%s HTTP/1.1\r\n", path.c_str()); + write(cmd, strlen(cmd)); + + sprintf(cmd, "Host: %s:%s\r\n", ip_domain.c_str(), port.c_str()); + write(cmd, strlen(cmd)); + + sprintf(cmd, "Upgrade: WebSocket\r\n"); + write(cmd, strlen(cmd)); + + sprintf(cmd, "Connection: Upgrade\r\n"); + write(cmd, strlen(cmd)); + + sprintf(cmd, "Sec-WebSocket-Key: L159VM0TWUzyDxwJEIEzjw==\r\n"); + write(cmd, strlen(cmd)); + + sprintf(cmd, "Sec-WebSocket-Version: 13\r\n\r\n"); + int ret = write(cmd, strlen(cmd)); + if(ret != strlen(cmd)) + { + close(); + printf("Could not send request"); + return false; + } + + while(socket.receive(cmd, 1) != 1); + + ret = read(cmd, 512); + if(ret < 0) + { + close(); + printf("Could not receive answer\r\n"); + return false; + } + + cmd[ret] = '\0'; +#ifdef DEBUG + printf("recv: %s\r\n", cmd); +#endif + + if( strstr(cmd, "DdLWT/1JcX+nQFHebYP+rqEx5xI=") == NULL ) + { + printf("Wrong answer from server, got \"%s\" instead\r\n", cmd); + do{ + ret = read(cmd, 512); + if(ret < 0) + { + printf("Could not receive answer\r\n"); + return false; + } + cmd[ret] = '\0'; + printf("%s",cmd); + } while(ret > 0); + close(); + return false; + } + + printf("\r\nip_domain: %s\r\npath: /%s\r\nport: %s\r\n\r\n", ip_domain.c_str(), path.c_str(), port.c_str()); + return true; +} + +int Websocket::sendLength(uint32_t len) { + + if (len < 126) { + sendChar(len | (1<<7)); + return 1; + } else if (len < 65535) { + sendChar(126 | (1<<7)); + sendChar((len >> 8) & 0xff); + sendChar(len & 0xff); + return 3; + } else { + sendChar(127 | (1<<7)); + for (int i = 0; i < 8; i++) { + sendChar((len >> i*8) & 0xff); + } + return 9; + } +} + +int Websocket::sendChar(char c) { + return write(&c, 1); +} + +int Websocket::readChar(char * pC, bool block) +{ + return read(pC, 1, block); +} + +int Websocket::sendOpcode(uint8_t opcode) { + return sendChar(0x80 | (opcode & 0x0f)); +} + +int Websocket::sendMask() { + for (int i = 0; i < 4; i++) { + sendChar(0); + } + return 4; +} + +int Websocket::send(char * str) { + sendOpcode(0x01); + sendLength(strlen(str)); + sendMask(); + int res = write(str, strlen(str)); + return res; +} + + +bool Websocket::read(char * message) { + int i = 0; + uint32_t len_msg; + char opcode = 0; + char c; + char mask[4] = {0, 0, 0, 0}; + bool is_masked = false; + Timer tmr; + + // read the opcode + tmr.start(); + while (true) { + if (tmr.read() > 3) { + printf("timeout ws\r\n"); + return false; + } + + if (socket.receive(&opcode, 1) != 1) { + return false; + } + + if (opcode == 0x81) + break; + } +#ifdef DEBUG + printf("opcode: 0x%X\r\n", opcode); +#endif + + readChar(&c); + len_msg = c & 0x7f; + is_masked = c & 0x80; + if (len_msg == 126) { + readChar(&c); + len_msg = c << 8; + readChar(&c); + len_msg += c; + } else if (len_msg == 127) { + len_msg = 0; + for (int i = 0; i < 8; i++) { + readChar(&c); + len_msg += (c << (7-i)*8); + } + } + + if(len_msg == 0) { + return false; + } +#ifdef DEBUG + printf("length: %d\r\n", len_msg); +#endif + if (is_masked) { + for (i = 0; i < 4; i++) + readChar(&c); + mask[i] = c; + } + + int nb = read(message, len_msg, false); + if (nb != len_msg) + return false; + + for (i = 0; i < len_msg; i++) { + message[i] = message[i] ^ mask[i % 4]; + } + + message[len_msg] = '\0'; + + return true; +} + +bool Websocket::close() { + if(!is_connected()) + return false; + + int ret = socket.close(); + if (ret < 0) + { + printf("Could not disconnect"); + return false; + } + return true; +} + +bool Websocket::is_connected() { + return socket.is_connected(); +} + +std::string Websocket::getPath() { + return path; +} + +int Websocket::write(char * str, int len, uint32_t timeout) { + int res = 0, idx = 0; + for (int j = 0; j < MAX_TRY_WRITE; j++) { + if (idx == len) + return len; + for(int i = 0; i < MAX_TRY_WRITE; i++) { + if ((res = socket.send_all(str + idx, len - idx)) != -1) + break; + + if (i == MAX_TRY_WRITE - 1) + return -1; + } + idx += res; + } + return idx; +} + +int Websocket::read(char * str, int len, bool block) { + int res = 0, idx = 0; + for (int j = 0; j < MAX_TRY_READ; j++) { + + if (idx == len) + return len; + + for(int i = 0; i < MAX_TRY_READ; i++) { + + if (block) { + if ((res = socket.receive_all(str + idx, len - idx)) != -1) + break; + } else { + if ((res = socket.receive(str + idx, len - idx)) != -1) + break; + } + + if (i == MAX_TRY_READ - 1 || !block) + return (idx == 0) ? -1 : idx; + } + + idx += res; + } + return idx; +}