简单的UDP通信的例子

最新推荐文章于 2024-07-11 14:50:23 发布

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这篇博客展示了如何进行简单的UDP通信。客户端通过发送'UDP TEST'字符串到服务器，服务器在接收到数据后，会将相同的字符串回传给客户端。主要涉及两个核心文件：udp_server.c（服务器端代码）和udp_client.c（客户端代码）。

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客户端向服务端发送字符串UDP TEST，服务器接收数据后将接收到的字符串发送回客户端

udp_server.c

#include <sys/types.h>
#include <sys/socket.h> /*socket()/bind()*/
#include <linux/in.h>   /*struct sockaddr_in*/
#include <string.h>     /*memset()*/
#define PORT_SERV 8888
#define BUFF_LEN 256
static udpserv_echo(int s, struct sockaddr *client)
{
    int n;
    char buff[BUFF_LEN];
    int len;
    while(1)
    {
        len = sizeof(*client);
        //接收数据放到buff中，并获得客户端地址
        n = recvfrom(s, buff, BUFF_LEN, 0, client, &len);
        //将接收到的n个字节发送回客户端
        sendto(s, buff, n, 0, client, len);

    }
}

int main(int argc, char *argv[])
{
    int s;
    struct sockaddr_in addr_serv,addr_clie;
    s = socket(AF_INET, SOCK_DGRAM, 0);
    memset(&addr_serv, 0, sizeof(addr_serv));
    addr_serv.sin_family = AF_INET;
    addr_serv.sin_addr.s_addr = htonl(INADDR_ANY);
    addr_serv.sin_port = htons(PORT_SERV);
    bind(s, (struct sockaddr*)&addr_serv, sizeof(addr_serv));
    udpserv_echo(s, (struct sockaddr*)&addr_clie);
    return 0;   

}

udp_client.c

#include <sys/types.h>
#include <sys/socket.h> /*socket()/bind()*/
#include <linux/in.h>   /*struct sockaddr_in*/
#include <string.h>     /*memset()*/
#include <stdio.h>
#define PORT_SERV 8888
#define BUFF_LEN 256
static void udpclie_echo(int s, struct sockaddr *to)
{
    char buff[BUFF_LEN] = "UDP TEST";
    struct sockaddr_in from;
    int len = sizeof(*to);
    sendto(s, buff, BUFF_LEN, 0, to, len);
    recvfrom(s,buff,BUFF_LEN,0, (struct sockaddr*)&from,&len);
    printf("recved:%s\n",buff); 
}

int main(int argc, char *argv[])
{
    int s;
    struct sockaddr_in addr_serv;
    s = socket(AF_INET, SOCK_DGRAM, 0);
    memset(&addr_serv, 0, sizeof(addr_serv));
    addr_serv.sin_family = AF_INET;
    addr_serv.sin_addr.s_addr = htonl(INADDR_ANY);
    addr_serv.sin_port = htons(PORT_SERV);
    udpclie_echo(s, (struct sockaddr*)&addr_serv);
    close(s);
    return 0;   

}