socket()服务端与客户端

思念

我没有很刻意的去想念你,因为我知道,遇到了就应该感恩,路过了就需要释怀。我只是在很多很多的小瞬
间,想起你。比如一部电影,一首歌,一句歌词,一条马路和无数个闭上眼睛的瞬间。

  1. 服务端代码:

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    /*server.c*/
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <sys/ioctl.h>
    #include <unistd.h>
    #include <netinet/in.h>

    #define PORT 4321
    #define BUFFER_SIZE 1024
    #define MAX_QUE_CONN_NM 5

    int main()
    {
    struct sockaddr_in server_sockaddr, client_sockaddr;
    int sin_size, recvbytes;
    int sockfd, client_fd;
    char buf[BUFFER_SIZE];

    /*建立socket连接*/
    if ((sockfd = socket(AF_INET,SOCK_STREAM,0))== -1)
    {
    perror("socket");
    exit(1);
    }
    printf("Socket id = %d\n",sockfd);

    /*设置sockaddr_in 结构体中相关参数*/
    server_sockaddr.sin_family = AF_INET;
    server_sockaddr.sin_port = htons(PORT);
    server_sockaddr.sin_addr.s_addr = INADDR_ANY;
    bzero(&(server_sockaddr.sin_zero), 8);

    int i = 1;/* 使得重复使用本地地址与套接字进行绑定 */
    setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));

    /*绑定函数bind*/
    if (bind(sockfd, (struct sockaddr *)&server_sockaddr, sizeof(struct sockaddr))== -1)
    {
    perror("bind");
    exit(1);
    }
    printf("Bind success!\n");

    /*调用listen函数*/
    if (listen(sockfd, MAX_QUE_CONN_NM) == -1)
    {
    perror("listen");
    exit(1);
    }
    printf("Listening....\n");

    /*调用accept函数,等待客户端的连接*/
    if ((client_fd = accept(sockfd, (struct sockaddr *)&client_sockaddr, &sin_size)) == -1)
    {
    perror("accept");
    exit(1);
    }

    /*调用recv函数接收客户端的请求*/
    memset(buf , 0, sizeof(buf));
    if ((recvbytes = recv(client_fd, buf, BUFFER_SIZE, 0)) == -1)
    {
    perror("recv");
    exit(1);
    }
    printf("Received a message: %s\n", buf);
    close(sockfd);
    exit(0);
    }
  2. 客户端代码:

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/*client.c*/
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>

#define PORT 4321
#define BUFFER_SIZE 1024

int main(int argc, char *argv[])
{
int sockfd, sendbytes;
char buf[BUFFER_SIZE];
struct hostent *host;
struct sockaddr_in serv_addr;

if(argc < 3)
{
fprintf(stderr,"USAGE: ./client Hostname(or ip address) Text\n");
exit(1);
}

/*地址解析函数*/
if ((host = gethostbyname(argv[1])) == NULL)
{
perror("gethostbyname");
exit(1);
}

memset(buf, 0, sizeof(buf));
sprintf(buf, "%s", argv[2]);

/*创建socket*/
if ((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1)
{
perror("socket");
exit(1);
}

/*设置sockaddr_in 结构体中相关参数*/
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(PORT);
serv_addr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(serv_addr.sin_zero), 8);

/*调用connect函数主动发起对服务器端的连接*/
if(connect(sockfd,(struct sockaddr *)&serv_addr, sizeof(struct sockaddr))== -1)
{
perror("connect");
exit(1);
}

/*发送消息给服务器端*/
if ((sendbytes = send(sockfd, buf, strlen(buf), 0)) == -1)
{
perror("send");
exit(1);
}
close(sockfd);
exit(0);
}
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