基于linux 的socket UDP编程例程

最新推荐文章于 2025-05-03 12:54:49 发布

hulin001007

最新推荐文章于 2025-05-03 12:54:49 发布

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分类专栏： UNIX编程文章标签： socket linux struct server 编程

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本文介绍了如何在Linux环境下使用C语言进行UDP套接字编程，包括服务器端(server_socket.c)和客户端(client_socket.c)的实现。服务器端创建并绑定UDP套接字，接收客户端发送的数据并回应，客户端发送'hello world!'消息并等待服务器响应。

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// server_socket.c

#include <unistd.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>

#define SERVER_PORT 6666
int main()
{
   int socketfd;
   int ret;
   int RecvLen;
   char RecvBuff[256];
   char SendBuff[256];

   struct sockaddr_in ser_addr, client_addr;

   socketfd = socket(AF_INET, SOCK_DGRAM, 0);
   if (0 > socketfd)
   {
       printf("can't create socket\n");
       return -1;
   }

   memset(&ser_addr, 0, sizeof(struct sockaddr_in));
   ser_addr.sin_family = AF_INET;
   ser_addr.sin_addr.s_addr = htonl(INADDR_ANY);
   ser_addr.sin_port = htons(SERVER_PORT);

   ret = bind(socketfd, (struct sockaddr *)&ser_addr,sizeof(struct sockaddr));
   if (0 > ret)
   {
       printf(" Bind fail\n");
       return -1;
   }

   int AddrLen = sizeof(struct sockaddr);
   while(1)
   {
       memset(RecvBuff, 0, sizeof(RecvBuff));
       RecvLen = recvfrom(socketfd, RecvBuff, sizeof(RecvBuff), 0,
           (struct sockaddr *)&ser_addr, &AddrLen);
       printf("recv: %s\n",RecvBuff);
       memset(SendBuff, 0, sizeof(SendBuff));
       printf("server-> :");
       gets(SendBuff);
       sendto(socketfd, SendBuff, sizeof(SendBuff), 0, (struct sockaddr*)
           &ser_addr, sizeof(struct sockaddr));
   }

   close(socketfd);
   return 0;
}

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//client_socket.c

#include <unistd.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>

#define SERVER_PORT 6666
int main()
{
   int socketfd;
   int ret;
   int RecvLen = 0;
   char RecvBuff[256];
   char SendBuff[256];

   struct sockaddr_in ser_addr, client_addr;

   socketfd = socket(AF_INET, SOCK_DGRAM, 0);
   if (0 > socketfd)
   {
       printf("can't create socket\n");
       return -1;
   }

   memset(&ser_addr, 0, sizeof(struct sockaddr_in));
   client_addr.sin_family = AF_INET;
   client_addr.sin_addr.s_addr = htonl(INADDR_ANY);
   client_addr.sin_port = htons(SERVER_PORT);

   memset(SendBuff, 0, sizeof(SendBuff));
   memcpy(SendBuff, "hello word!\n", 100);
   sendto(socketfd, SendBuff, sizeof(SendBuff), 0, (struct sockaddr *)
       &client_addr, sizeof(struct sockaddr));

   int AddrLen = sizeof(struct sockaddr);
   while(1)
   {
       memset(RecvBuff, 0, sizeof(RecvBuff));
       RecvLen = recvfrom(socketfd, RecvBuff, sizeof(RecvBuff), 0,
           (struct sockaddr *)&client_addr, &AddrLen);
       printf("recv: %s\n",RecvBuff);
       memset(&SendBuff, 0, sizeof(SendBuff));
       printf("client-> :");
       gets(SendBuff);
       sendto(socketfd, SendBuff, sizeof(SendBuff), 0, (struct sockaddr *)
           &client_addr, sizeof(struct sockaddr));
   }

   close(socketfd);
   return 0;
}