ProxyServer/server.c+cach2 at master · AustinWatersUNT/ProxyServer · GitHub

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/* Multiple simultaneous clients handled by threads; */
#include <unistd.h>
#include <pthread.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>  /* system type defintions */
#include <sys/socket.h> /* network system functions */
#include <netinet/in.h> /* protocol & struct definitions */
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>

#define BACKLOG 	   5
#define BUF_SIZE	   1024
#define LISTEN_PORT 	8871
#define SERVER_PORT 	80

int threadCount = BACKLOG;
void *client_handler(void *arg);
int getIpAddress(char*, char*);
int destinationSock(char*);
int blacklist(char*);
FILE *cach;
FILE *Wcach;
char *mode = "r";
char outputFilename[20];
char inputFilename[20];
char ch;
int main(int argc, char *argv[]){
  int status, *sock_tmp;
  pthread_t a_thread;
  void *thread_result;

   struct sockaddr_in addr_mine;
   struct sockaddr_in addr_remote;
   int sock_listen;
   int sock_aClient;
   int addr_size;
   int reuseaddr = 1;


   sock_listen = socket(AF_INET, SOCK_STREAM, 0);
   if (sock_listen < 0) {
      perror("socket() failed");
      exit(0);
   }

   memset(&addr_mine, 0, sizeof (addr_mine));
   addr_mine.sin_family = AF_INET;
   addr_mine.sin_addr.s_addr = htonl(INADDR_ANY);
   addr_mine.sin_port = htons((unsigned short)LISTEN_PORT);

   // /* Enable the socket to reuse the address */
   // if (setsockopt(sock_listen, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
   //   sizeof(int)) == -1) {
   // perror("setsockopt");
   //   close(sock_listen);
   // exit(1);
   // }

   status = bind(sock_listen, (struct sockaddr *) &addr_mine,
   sizeof (addr_mine));
   if (status < 0) {
      perror("bind() failed");
      close(sock_listen);
      exit(1);
   }

   status = listen(sock_listen, 5);
   if (status < 0) {
      perror("listen() failed");
      close(sock_listen);
      exit(1);
   }

   addr_size = sizeof(struct sockaddr_in);
   printf("waiting for a client\n");
   while(1) {
      if (threadCount < 1) {
      sleep(1);
   }

   sock_aClient = accept(sock_listen, (struct sockaddr *) &addr_remote,
   &addr_size);
   if (sock_aClient == -1){
      close(sock_listen);
      exit(1);
   }

   printf("Got a connection from %s on port %d\n",
   inet_ntoa(addr_remote.sin_addr),
   htons(addr_remote.sin_port));
   sock_tmp = malloc(1);
   *sock_tmp = sock_aClient;
   printf("thread count = %d\n", threadCount);
   threadCount--;
   status = pthread_create(&a_thread, NULL, client_handler,
   (void *) sock_tmp);
   if (status != 0) {
      perror("Thread creation failed");
      close(sock_listen);
      close(sock_aClient);
      free(sock_tmp);
      exit(1);
   }
}

return 0;
}

void *client_handler(void *sock_desc) {

   int msg_size;
   char ip[100];
   int sock_send;
   int i;
   int send_len, bytes_sent;
   char buf[BUF_SIZE];
   int sock = *(int*)sock_desc;

   printf("In client_handler\n");

   while ((msg_size = recv(sock, buf, BUF_SIZE, 0)) > 0) { //This grabs a from the browser

      buf[msg_size] = 0;
      printf("Message:\n%s\n\n\n", buf);

	  char message[BUF_SIZE];
      strcpy(message, buf);
      char* url = strtok(message, "/");
      url = strtok(NULL, " ");

      printf("Weburl: %s\n", url);
      char tempUrl[100];
      strcpy(tempUrl, url);
      char* hostname = strtok(url, "/");
      char* fileRoute = strtok(NULL, "\0");

      printf("hostname: %s\n", hostname);
      if(blacklist(hostname) == 0)
      {
          strcpy(buf, "HTTP/1.1 200\r\n");
          strcat(buf, "Content-Type: text/html; charset=UTF-8\r\n\r\n");
          strcat(buf, "<!DOCTYPE html><html><head><title>Blacklist Page</title></head><body><h1>BLACKLIST</h1><p>THIS SITE IS NOT ALLOWED ON THIS SERVER</p></body></html>");
          send_len=strlen(buf);
          bytes_sent=send(sock,buf,send_len,0);
      }
      else
      {
         int fail = getIpAddress(hostname, ip); //retrives the ip address for website and saves it to ip
         if(fail == 1)
         {
			strcpy(buf, "HTTP/1.1 404\r\n");
            strcat(buf, "Content-Type: text/html; charset=UTF-8\r\n\r\n");
            strcat(buf, "<!DOCTYPE html><html><head><title>Page Doesn't Exist</title></head><body><h1>404</h1><p>Webpage not found</p></body></html>");
            send_len=strlen(buf);
            bytes_sent=send(sock,buf,send_len,0);
         }
         else
         {
//inputFilename = hostname;
mode ="r";
cach = fopen(hostname, mode);
if (cach != NULL) {
printf("\ncache detected sending info\n");
  while( ( ch = fgetc(cach) ) != EOF ){
              // send_len=strlen(ch);
               bytes_sent=send(sock,ch,1,0);}
printf("done sending data\n");
fclose(cach);
}
else{
printf("no cache file detected %s!\n",inputFilename);
//fclose(cach);
mode = "w";
strcpy(outputFilename, hostname);
//outputFilename = hostname;
Wcach = fopen(hostname, mode);
if (Wcach == NULL) {
  fprintf(stderr, "Can't open output file %s!\n",
          outputFilename);
}

	printf("output file atttmpting to access %s\n",outputFilename);
            printf("\nSending IP: %s\n", ip); //prints the ip
            sock_send = destinationSock(ip); //creates a socket to that ip and port 80
            strcpy(buf, "GET /");
            //strcat(buf, fileRoute);
            strcat(buf, " HTTP/1.1\r\n");
            strcat(buf, "Host: ");
            strcat(buf, url);
            strcat(buf, "\r\n");
            strcat(buf, "Connection: keep-alive\r\n");
            strcat(buf, "Cache-Control: max-age=0\r\n");
            strcat(buf, "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\n");
            strcat(buf, "User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.90 Safari/537.36\r\n");
            strcat(buf, "Accept-Encoding: gzip, deflate, sdch\r\n");
            strcat(buf, "Accept-Language: en-US,en;q=0.8\r\n\r\n");

            send_len=strlen(buf);
            bytes_sent=send(sock_send,buf,send_len,0);

            printf("\n\n");
             //this reads in the response 1024 characters and sends that 1024 characters to the browser
            //this is also where we would stream buf to a file as well for reading from cache

		    if(strcmp(hostname, "cse.unt.edu") == 0)
            {
               strcpy(buf, "HTTP/1.1 200\r\n");
               strcat(buf, "Content-Type: text/html; charset=UTF-8\r\n\r\n");
               send_len=strlen(buf);
               bytes_sent=send(sock,buf,send_len,0);
            }
            while ((msg_size = recv(sock_send, buf, BUF_SIZE, 0)) > 0) {
               buf[msg_size] = 0;
		fprintf(Wcach,"%s", buf);
               printf("%s", buf);
               send_len=strlen(buf);
               bytes_sent=send(sock,buf,send_len,0);
               strcpy(buf, "\0");
            }
		fclose(Wcach);
            printf("\n\nOut of Loop\n");
            strcpy(buf, "");
            close(sock_send);
         }
	}
      }
   }
   close(sock);
   free(sock_desc);
   threadCount++;
   // pthread_exit("Thank you for the CPU time");
}

int blacklist(char* hostname)
{
   if(strcmp(hostname, "facebook.com") == 0) return 0;
   else if(strcmp(hostname, "youtube.com") == 0) return 0;
   else if(strcmp(hostname, "hulu.com") == 0) return 0;
   else if(strcmp(hostname, "example.com") == 0) return 0;
   else return 1;
}

int getIpAddress(char* hostname, char* ip)
{
   int sockfd;
    struct addrinfo hints, *servinfo, *p;
    struct sockaddr_in *h;
    int rv;

    if ( (rv = getaddrinfo( hostname , NULL , NULL , &servinfo)) != 0)
    {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
        return 1;
    }

    // loop through all the results and connect to the first we can
    for(p = servinfo; p != NULL; p = p->ai_next)
    {
        h = (struct sockaddr_in *) p->ai_addr;
        strcpy(ip , inet_ntoa( h->sin_addr ) );
    }

    freeaddrinfo(servinfo); // all done with this structure
    return 0;
}

int destinationSock(char* ip)
{
   int sock_send;
   struct sockaddr_in addr_send;
   int i;

   sock_send=socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
   if (sock_send < 0) {
      printf("socket() failed\n");
      exit(0);
    }
    else {
      printf("socket created\n");
   }

   /* create socket address structure to connect to */
   memset(&addr_send, 0, sizeof (addr_send)); /* zero out structure */
   addr_send.sin_family = AF_INET; /* address family */
   addr_send.sin_addr.s_addr = inet_addr(ip);
   addr_send.sin_port = htons((unsigned short)SERVER_PORT);

   /* connect to the server */
   i=connect(sock_send, (struct sockaddr *) &addr_send, sizeof (addr_send));
   if (i < 0) {
      printf("connect() failed\n");
      close(sock_send);
      exit(0);
    }
    else {
      printf("connect successful\n");
   }
   return sock_send;
}