/*
   tcp torture client, with a simulated delay between receives.

   compile with gcc tcpclient.c -o tcpclient
   run with ./tcpclient serverip
*/

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<netdb.h>
#include<fcntl.h>
#include<pthread.h>
#include <sys/time.h>

#define RPORT 30000
#define BUFSIZE 1024

// first command-line arg is ip address of server
int main(int argc, char**argv)
{
  int cfd;   //  client file descriptors
  int result;     
  int x, i;        
  unsigned char buffer[BUFSIZE];    // 1K buffer

  struct sockaddr_in saddr;
  saddr.sin_family = AF_INET;
  saddr.sin_addr.s_addr = inet_addr(argv[1]);
  saddr.sin_port = htons(RPORT);
  cfd = socket(AF_INET,SOCK_STREAM,0);
  connect(cfd,(struct sockaddr *)&saddr,sizeof(saddr));
 
  printf(" ****** connection established\n");

  for(i=0;i<10000000;i++)
    {
      result = read(cfd,buffer,BUFSIZE); // result == bytes read
      // extract and print sequence number inside first 4 bytes of buffer:
      x = *((int*)buffer);
      printf("packet %d received\n",x);

      // intensional delay to throttle server
      for(x=0;x<100000000;x++) { x++; x--; } 
      
    } // for i

  close(cfd);  
  
  exit(0);
} // main