client.c

socket, server.c and client.c

/****************************************************************
 * $ID: client.c        三, 26  3月 2008 15:36:59 +0800  root $ *
 *                                                              *
 * Description:                                                 *
 *                                                              *
 * Maintainer:  范美辉(Meihui Fan)  <[e-mail]>            *
 *                                                              *
 * Copyright (C)  2008  HHTech                                  *
 *   www.hhcn.com, www.hhcn.org                                 *
 *   All rights reserved.                                       *
 *                                                              *
 * This file is free software;                                  *
 *   you are free to modify and/or redistribute it   	        *
 *   under the terms of the GNU General Public Licence (GPL).   *
 *                                                              *
 * Last modified: 三, 26  3月 2008 17:01:07 +0800       by root #
 ****************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#define PORT	4000
#define BACKLOG	10

int main(int argc, char *argv[])
{
    int sock_fd, new_fd;
    int sin_size;
    struct sockaddr_in server_addr;
    struct hostent *he;
    char welcome[50];
    char buf[100];
    
    if(argc != 2)
    {
	printf("USAGE: client <server>\n");
	exit(1);
    }

    if((he = gethostbyname(argv[1])) == NULL)
    {
	printf("gethostbyname");
	exit(1);
    }

    if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
	perror("socket");
	exit(1);
    }
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr = *((struct in_addr *)(he->h_addr));
    bzero(&(server_addr.sin_zero), 8);

    if(connect(sock_fd, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
    {
	perror("connect");
	close(sock_fd);
	exit(1);
    }
    if(recv(sock_fd, &welcome[0], 50, 0) == -1)
    {
	perror("recv");
	close(sock_fd);
	exit(1);
    }
    printf(welcome);

    while(1)
    {
	printf("send => ");
	while(fgets(buf, 100, stdin) == NULL);
	send(sock_fd, &buf[0], 100, 0);
	recv(sock_fd, &buf[0], 100, 0);
	printf("receive => %s\n", &buf[0]);
    }

    close(sock_fd);

    return 0;
}

/******************** End Of File: client.c ********************/
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