server.c~

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include "packet.c";


int main (int argc, char*argv[]){
  struct sockaddr_in client_ip, host_ip;
  char buffer[1024], str[1024];;
  struct sockaddr_storage mem;
  socklen_t memSize, client_length;
  int sock, n, port, file_size, packet_amount, i;
  FILE *fp;
 if(argc < 1){
	printf("enter port number \n");
   return -1;
 }

port = atoi(argv[1]);

//start up memory size
  memSize = sizeof mem;

	struct packet p;
	p.number = 0;
	//open a socket for data
  sock = socket(PF_INET, SOCK_DGRAM, 0);

	//set up the server addres
  host_ip.sin_family = AF_INET;
  host_ip.sin_addr.s_addr = inet_addr("127.0.0.1");
  host_ip.sin_port = htons(port);
  memset(host_ip.sin_zero, '\0', sizeof host_ip.sin_zero);  

printf("SERVER STARTED \n");

  bind(sock, (struct sockaddr *) &host_ip, sizeof(host_ip));

  while(1){

    n = recvfrom(sock,buffer,1024,0,(struct sockaddr *)&mem, &memSize);

	//file exists
	if( access( buffer, F_OK ) != -1 ) {
		//get file size
		fp = fopen(buffer, "r");
		fseek(fp, 0L, SEEK_END);
		file_size = ftell(fp);
		fseek(fp, 0L, SEEK_SET);
		
		packet_amount = file_size/1024 + 1;	
		sprintf(str, "%d", packet_amount);
		strcpy(buffer, str);
    	    sendto(sock, buffer , n, 0, (struct sockaddr *)&mem, memSize);

	} else {


	}
	    strcpy(buffer, "file does not exist");
    	    sendto(sock, buffer , n, 0, (struct sockaddr *)&mem, memSize);
  }

  return 0;
}