Revision 6:9044de9736a1, committed 2014-05-13

Comitter:

sunilaluri6

Date:

Tue May 13 03:44:37 2014 +0000

Parent:

5:0f0fdadab553

Commit message:

Cookie Server

Changed in this revision

diff -r 0f0fdadab553 -r 9044de9736a1 main.cpp
--- a/main.cpp	Fri Mar 01 15:37:15 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,34 +0,0 @@
-#include "mbed.h"
-#include "EthernetInterface.h"
-
-#define ECHO_SERVER_PORT   7
-
-int main (void) {
-    EthernetInterface eth;
-    eth.init(); //Use DHCP
-    eth.connect();
-    printf("IP Address is %s\n", eth.getIPAddress());
-    
-    TCPSocketServer server;
-    server.bind(ECHO_SERVER_PORT);
-    server.listen();
-    
-    while (true) {
-        printf("\nWait for new connection...\n");
-        TCPSocketConnection client;
-        server.accept(client);
-        client.set_blocking(false, 1500); // Timeout after (1.5)s
-        
-        printf("Connection from: %s\n", client.get_address());
-        char buffer[256];
-        while (true) {
-            int n = client.receive(buffer, sizeof(buffer));
-            if (n <= 0) break;
-            
-            client.send_all(buffer, n);
-            if (n <= 0) break;
-        }
-        
-        client.close();
-    }
-}

diff -r 0f0fdadab553 -r 9044de9736a1 mbed_tcp_cookie_server_Sunil_Aluri.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed_tcp_cookie_server_Sunil_Aluri.cpp	Tue May 13 03:44:37 2014 +0000
@@ -0,0 +1,116 @@
+/***********************************************************************/
+/******************************Prologue*********************************/
+/*              University of California Santa Cruz Extension          */
+/*                                                                     */
+/*          Internet of Things                                         */
+/*          Instructor: Avnish Aggarwal                                */
+/*          Author: Sunil Aluri                                        */
+/*          Assignment 4 part2a                                        */
+/*                                                                     */
+/*          File name: mbed_tcp_cookie_server_Sunil_Aluri.cpp          */
+/*          Date:5/12/2014                                             */
+/*          Objective: Develop a program to                            */
+/*          fetch cookies,date from internet and send them to client   */
+/*          each time it connects                                      */
+/*          Comments: Since, I do not have two Mbed boards, used a     */
+/*          telent client to get the server data                       */
+/***********************************************************************/
+
+
+#include "mbed.h"
+#include "EthernetInterface.h"
+#define ECHO_SERVER_PORT   7  // define the port which the clients can connect to 
+
+// FetchCookies Class function is to , connect to a http web server and get the html header
+// of the webiste, which contains Date and Set-Cookie fields.
+class FetchCookies
+{
+private:
+    char buffer[300],*key,*date,*cookie,*client_message;
+    int ret;
+    TCPSocketConnection sock; //create a socket for TCP connection on the server
+public:
+    FetchCookies() {  // initiate all the pointers and buffers
+        ret=0;
+        buffer[0]='\0';
+        key =0;
+        date=0;
+        cookie=0;
+        client_message=0;
+    }
+    ~FetchCookies() { // destructor that frees the memory allocated
+        free(client_message);
+    }
+
+
+// getCookie method, connects to a website and requests header. It fetches the date and cookie
+// part of the received header and sends out the information to the caller function.
+    char* getCookie () {
+        sock.connect("google.com", 80); // connect to the webserver
+        //send the HEAD cmd to request header of the webpage
+        char http_cmd[] = "HEAD http://www.google.com/ HTTP/1.0\r\n\r\n"; 
+        sock.send_all(http_cmd, sizeof(http_cmd)-1);
+        // receive the information from web server
+        ret = sock.receive(buffer, sizeof(buffer)-1);
+        // using strtok function, fetch for date and cookie part of header, which are
+        //delimited by \n charecter
+        if (ret > 0) {
+            buffer[ret] = '\0';
+            key = strtok(buffer,"\n");
+            date = strtok(NULL,"\n");
+            while(key!=NULL) {
+                key=strtok(NULL,"\n");
+                if(strstr(key,"Set")==NULL) {
+                    continue;
+                } else {
+                    cookie =key;
+                    break;
+                }
+            }
+            // for string concatenation, assign memory
+            client_message = (char*)malloc(strlen(date)+strlen(cookie)+1);
+            // copy the date and cookie info into the message pointer
+            sprintf(client_message,"%s\r\n%s",date,cookie);
+        }
+        //close the webserver connection
+        sock.close();
+        // send the TCP client message pointer.
+        return(client_message);
+    }
+};
+
+
+int main (void)
+{
+    /**** ether net interface definition begin *****/
+    EthernetInterface eth; 
+    eth.init(); //Use DHCP
+    eth.connect();
+    /**** ethernet interface definition end*******/
+    FetchCookies FC; // create an object for Fetch Cookies class
+    printf("\r\nIP Address is %s\n", eth.getIPAddress()); //print the server IP address
+    TCPSocketServer server; //create a socket for server to listen to requests
+    server.bind(ECHO_SERVER_PORT); // bind the port to server
+    server.listen(); //listen for client requests
+    char *client_info=0;
+    //the following loop, listens for new connections, make them and send the response message to clients
+    while (true) {
+        printf("\r\nWait for new connection...\r\n");
+        TCPSocketConnection client;
+
+        server.accept(client); // accept the incoming connection
+        client.set_blocking(false, 5500); // Timeout after (1.5)s
+        client_info =FC.getCookie(); // fetch new cookie and date from webservers
+        printf("Connection from: %s\r\n", client.get_address());
+        if(client_info == 0)  // if no message was obtained, quit and start for new client connection 
+            break;
+        printf("Sending Data to client...\r\n"); // if webserver gives the cookies, send them to client.
+        client.send_all(client_info,strlen(client_info));
+        wait(5); 
+        printf("Closing connection\r\n"); // after sending the message, close the connection
+        client.close();
+    }
+    
+}
+
+