Network threaded C program please solve and write Execution of below code: gcc w

Question

Network threaded C program please solve and write

Execution of below code:

gcc webproxy.c

./a.out (any port number)

Go to your web browser then type in "cse01.cse.unt.edu:8888/www.google.com"

But for the Instructions above it should be able to handle using multiple browsers opened. Atleast finish the parts about multithreading, blocking websites and caching.

Code:

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>

int main(int argc, char *argv[])
{
   int sock;

   sock = socket(AF_INET, SOCK_STREAM, 0);
   if (socket < 0) {
       printf("Error creating a socket. ");
       return 0;
   }

   int i;
   struct sockaddr_in my_addr;
   unsigned short port;

   port = atoi(argv[1]);
   printf("Port is: %d ", port);

   memset(&my_addr, 0, sizeof(my_addr));
   my_addr.sin_family = AF_INET;
   my_addr.sin_addr.s_addr = INADDR_ANY;
   my_addr.sin_port = htons(port);

   i = bind(sock, (struct sockaddr *) &my_addr, sizeof(my_addr));
   if (i < 0) {
       printf("Error binding the socket. ");
       return 0;
   }

   i = listen(sock, 5);
   if (i < 0) {
       printf("Error listening failed. ");
       return 0;
   }

   int receive, sizeaddr;
   struct sockaddr_in recaddr;
  
   sizeaddr = sizeof(recaddr);
   receive = accept (sock, (struct sockaddr *) &recaddr, &sizeaddr);

   char info[100000];

   recv(receive, info, sizeof(info), 0);

   char url[100];
   int j, pos = 5, count = 0;

   if (info[5] == ' ') {
       printf("Wrong URL ");
       return 0;
   }

   while (info[pos] != ' ') {
       pos ++;
   }

   for (j=9; j<pos; j++) {
       url[count] = info[j];
       count++;
   }
   url[count] = '';

   char filereq[100000] = "GET / HTTP/1.1 Host: www.";
   int k, c = strlen(filereq);

   for (j=0; j<sizeof(url); j++) {
       filereq[c] = url[j];
       c++;
   }

   for (j=0; j<sizeof(info); j++) {
       if (info[j]=='C' && info[j+1]=='o' && info[j+2]=='n' && info[j+3]=='n' && info[j+4]=='e' && info[j+5]=='c' && info[j+6]=='t') {
           c = strlen(filereq);
           for (k=j-1; k<sizeof(info); k++) {
               filereq[c] = info[k];
               c++;
           }
       }
   }

   int sock2;

   sock2 = socket(AF_INET, SOCK_STREAM, 0);
   if (sock2 < 0) {
       printf("Error creating a socket. ");
       return 0;
   }

   struct sockaddr_in addrnew;
   struct hostent *requesturl;

   if ((requesturl = gethostbyname(url)) == NULL) {
       printf("host name not received. ");
       return 0;
   }

   memset(&addrnew, 0, sizeof(addrnew));
   memcpy((char *) &addrnew.sin_addr.s_addr, (char *) requesturl->h_addr, requesturl->h_length);

   addrnew.sin_port = htons(80);
   addrnew.sin_family = AF_INET;

   if (connect(sock2, (struct sockaddr *) &addrnew, sizeof(addrnew)) != 0) {
       printf("Connection failed. ");
       return 0;
   }

   write(sock2, filereq, sizeof(filereq));
   read(sock2, filereq, sizeof(filereq));
   write(receive, filereq, sizeof(filereq));

   close(sock);
   close(sock2);

   return 0;
}

Multi-threaded Proxy Server Use the Web Proxy from Programming #1 to build a mutli-threaded proxy server that will have the following features: It should be able to handle multiple requests at the same time. Blocking web sites if they are found in a black list (www.facebook.com, www.youtube.com, www.hulu.com, www.virus.com Filtering out inappropriate language (http://www.hyperhero.com/en/insults.htm) from a requested site 1. 2. 3. (The proxy has all the previous features it receives an HTTP request for an object from a browser, it generates a new HTTP request for the same object and sends it to a remote server that is hosting the requested object. When the proxy receives the corresponding HTTP response with the object from the remote server, it creates a new HTTP response, including the object, and sends it to the client. If the object is in cache, the request doesn't go to origin server!) Complete your assignment in C programming language!! The programming problem are taken from the textbook, "Compute Networking, A top down approach" To test your program, use a web browser as a client. The following address format should be used in the address bar 129.120.151.96:8888/www.cse.unt.edu 129,120.151.96-> ip address of the proxy server 8888-> port number of the proxy server www.cse.unt.edu-> the address of the website being accessed on the origin server ·

Explanation / Answer

//#include <iostream.h>
#include <stdio.h>
#include <stdlib.h>
//#include <string.h>
// #include <conio.h>

// the following additional codes are required to be added
//   to the code already typed in the question
#include <unistd.h>
#include <sys/socket.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
// arpanet = Advanced Research Project Agency Network
/*

*/
#include <pthread.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/types.h>

#define PortNumber 7070 // this is where the clients are trying to connect via to the server
#define PendingAllowed 15 // up to a maximum of 15 clients can await in the queue for server
int exitCondition = 1;
void signalChildHandler(int signal1)       {
   pid_t condition = wait(NULL);
   while (condition);
} // end function signalChildHandler
  
forkedSubProcess()   {
   pid_t currentProcessId;
   int j, k, l;
   char string1[5000];
   currentProcessId = getpid();
} // end function forkedSubProcess

void signalChildHandler2(int signal2)   {
   pid_t processId5, processId6;
   processId5 = fork();
   if (processId == 0 )    {
       forkedSubProcess(" Fifth Process ");
   }
   if (processId5 < 0 ) {
       printf(" Unable to fork the child process numberd 5 ");
       // one tab = indenting for each process id hence 5 times tab indent for process id 5
       exit(exitCondition);      
   } // end then part of if
   processId6 = fork();
   if (processId == 0 )    {
       forkedSubProcess(" Sixth Process ");
   }
   if (processId6 < 0 ) {
       printf(" Unable to fork the child process numberd 6 ");
       // one tab = indenting for each process id hence 6 times tab indent for process id 6
       exit(exitCondition);      
   } // end then part of if
   processId7 = fork();
   if (processId == 0 )    {
       forkedSubProcess(" Seventh Process ");
   }
   if (processId7 < 0 ) {
       printf(" Unable to fork the child process numberd 7 ");
       // one tab = indenting for each process id hence 7 times tab indent for process id 7
       exit(exitCondition);      
   } // end then part of if
   processId9 = fork();
   if (processId == 0 )    {
       forkedSubProcess(" Fifth Process ");
   }
   if (processId9 < 0 ) {
       printf(" Unable to fork the child process numberd 9 ");
       // one tab = indenting for each process id hence 9 times tab indent for process id 9
       exit(exitCondition);      
   } // end then part of if
   processId10 = fork();
   if (processId == 0 )    {
       forkedSubProcess(" Fifth Process ");
   }
   if (processId10 < 0 ) {
       printf(" Unable to fork the child process numberd 10 ");
       // one tab = indenting for each process id hence 10 times tab indent for process id 10
       exit(exitCondition);      
   } // end then part of if

} // // end function signalChildHandler2

int main()
{

return 0; // exit
} // end of main()

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