client.cpp

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


void error(const char *msg) {
  perror(msg);
  exit(0);
}

int main() {
  int sockfd, portno, n;
  struct sockaddr_in serv_addr;
  struct hostent *server;
  char buffer[256];

  portno = 8080;
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0)
    error("ERROR opening socket");

  server = gethostbyname("localhost");
  if (server == NULL) {
    fprintf(stderr, "ERROR, no such host\n");
    exit(0);
  }

  bzero((char *)&serv_addr, sizeof(serv_addr));
  serv_addr.sin_family = AF_INET;
  bcopy((char *)server->h_addr, (char *)&serv_addr.sin_addr.s_addr,
        server->h_length);
  serv_addr.sin_port = htons(portno);

  if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
    error("ERROR connecting");

  bzero(buffer, 256);
  strcpy(buffer, "Hello Server");
  printf("Sending to server: %s\n", buffer);

  n = write(sockfd, buffer, strlen(buffer));
  if (n < 0)
    error("ERROR writing to socket");

  bzero(buffer, 256);
  n = read(sockfd, buffer, 255);
  if (n < 0)
    error("ERROR reading from socket");

  printf("Server response: %s\n", buffer);

  close(sockfd);
  return 0;
}