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;
+}