#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>

static int set_nonblock(int fd) {
  int fl;
  fl = fcntl(fd, F_GETFL);
  if(fl==-1) return -1;
  if(!fcntl(fd, F_SETFL, fl|O_NONBLOCK)) return 0;
  return -1;
}

static int do_connect(uint32_t b_addr, uint16_t b_port, uint32_t addr, uint16_t port) {
  struct sockaddr_in ba, sa;
  int fd;
  
  bzero(&ba, sizeof(ba));
  ba.sin_family = AF_INET;
  ba.sin_addr.s_addr = b_addr;
  ba.sin_port = htons(b_port);
  bzero(&sa, sizeof(sa));
  sa.sin_family = AF_INET;
  sa.sin_addr.s_addr = addr;
  sa.sin_port = htons(port);
  if((fd = socket(PF_INET, SOCK_STREAM, 0))<0) { fprintf(stderr,"socket() error %d (%s)\n", errno, strerror(errno)); return -1; }
  if(b_addr!=0xFFFFFFFF && bind(fd, (struct sockaddr*)&ba, sizeof(ba))<0) { fprintf(stderr,"bind() error %d (%s)\n", errno, strerror(errno)); return -1; }
  if(set_nonblock(fd)<0) { fprintf(stderr,"set_nonblock() error %d (%s)\n", errno, strerror(errno)); return -1; }
  if(connect(fd, (struct sockaddr*)&sa, sizeof(sa))<0 && errno!=EINPROGRESS) { fprintf(stderr,"connect() error %d (%s)\n", errno, strerror(errno)); return -1; }
  return 0;
}

int main(int argc, char **argv) {
  int i, j;
  uint32_t addr, raddr;
  j = atoi(argv[1]);
  addr = inet_addr(argv[2]);
  raddr = inet_addr(argv[3]);
  for(i=0; i<j; i++) do_connect(raddr,0,addr,2000);
  system("netstat -an");
  while(1) sleep(1);
  return 0;
}