Linux环境下 UDP服务端/客户端代码

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//发送端代码
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <error.h>
#include <stdlib.h>
#include <arpa/inet.h>

int main(int argc, char *argv[])
{
   struct sockaddr_in s_addr;//结构体
   int sock;
   int addr_len;//获取结构长度
   int len;
   char buff[128];
   int yes;

   if (argc != 2)
   {
       printf("Please input %s IP\n",argv[1]);
   }

   if(-1 == (sock = socket(AF_INET, SOCK_DGRAM, 0))){ //以UDP方式创建socket
       perror("socket");
       exit(EXIT_FAILURE);
   }
   else
       printf("create socket.\n\r");
   yes = 1;
   setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(yes)); //设置socket为可发送广播消息

   s_addr.sin_family = AF_INET;
   s_addr.sin_port = htons(7838);//指定接收广播消息的端口

   if(argv[1]){
       s_addr.sin_addr.s_addr = inet_addr(argv[1]); //argv[1] 为广播消息的目的地址，即广播地址
   }
   else{
       printf("input server IP!\n");
       exit(0);
   }
   addr_len = sizeof(s_addr);
   strcpy(buff, "hello message");
//   while(1){
   int i;
   for(i=0; ; i++){
       len = sendto(sock, buff, strlen(buff), 0, (struct sockaddr*)&s_addr, addr_len);   //使用UDP广播的消息
       if(len < 0){
           printf("\n\rsend error.\n\r");
           exit(EXIT_FAILURE);
       }
       sleep(1);
       printf("send success %d:\tsend message is %s\n",i,&buff);
   }
   return 0;
}

接受端代码

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <error.h>
#include <stdlib.h>
#include <arpa/inet.h>
#define MAXSIZE 128

int main(int argc, char* argv[])
{
   struct sockaddr_in s_addr;
   struct sockaddr_in c_addr;
   int sock;
   socklen_t addr_len;
   int len;
   char buff[MAXSIZE];
   if(-1 == (sock = socket(AF_INET, SOCK_DGRAM, 0))){
       perror("socket");
       exit(EXIT_FAILURE);
   }
   else
       printf("create socket success\n");

   memset(&s_addr, 0 , sizeof(struct sockaddr_in));
   s_addr.sin_family = AF_INET;
   s_addr.sin_port = htons(7838);
   s_addr.sin_addr.s_addr = INADDR_ANY; //指示接收的数据IP，必须为此值,因为是广播，接收地址任意

   if(-1 == (bind(sock, (struct sockaddr*)&s_addr, sizeof(s_addr)))){
       perror("bind");
       exit(EXIT_FAILURE);
   }
   else{
       printf("bind address to socket.\n");
   }
   addr_len = sizeof(c_addr);
   while(1){
       len = recvfrom(sock, buff,sizeof(buff)-1, 0, (struct sockaddr*)&c_addr, &addr_len);//从服务端接收数据
       if(len < 0){
           perror("recvfrom failed...");
           exit(EXIT_FAILURE);
       }
   buff[len]= '\0';
   printf("receive come from %s:%d message:%s\n",inet_ntoa(c_addr.sin_addr), ntohs(c_addr.sin_port),buff);
   }
   return 0;
}

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