广播机制的CS模型实现

广播机制的cs模型实现如下：

　　首先可以使用ifconfig命令查看自己所在网段的广播地址

server.c

 #include<stdio.h>
 #include<unistd.h>
 #include<stdlib.h>
 #include <strings.h>
 #include<string.h>
 #include<sys/socket.h>
 #include<arpa/inet.h>
 #include<net/if.h>

 #define SERVER_PORT 8000 //服务端端口无关紧要
 #define MAXLINE 1500

 #define BROADCAST_IP "192.168.23.255"//所在局域网的广播IP
 #define CLIENT_PORT 9000 //客户端端口必须指定

 int main(int argc,char* argv[])
 {
     int sockfd;
     struct sockaddr_in servaddr,clieaddr;
     char buf[MAXLINE];
     //构造用于UDP通信的套接字
     sockfd = socket(AF_INET,SOCK_DGRAM,);

     bzero(&servaddr,sizeof(servaddr));
     servaddr.sin_family = AF_INET;               //IPv4
     servaddr.sin_addr.s_addr = htonl(INADDR_ANY);//本地任意有效IP
     servaddr.sin_port = htons(SERVER_PORT);

     bind(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr));

     int flag = ;
     setsockopt(sockfd,SOL_SOCKET,SO_BROADCAST,&flag,sizeof(flag));

     //构造client地址 IP+端口
     bzero(&clieaddr,sizeof(clieaddr));
     clieaddr.sin_family = AF_INET;
     inet_pton(AF_INET,BROADCAST_IP,&clieaddr.sin_addr.s_addr);
     clieaddr.sin_port = htons(CLIENT_PORT);

     int i = ;
     while()
     {
         sprintf(buf,"服务端发送了广播%d 次\n",i++);
         sendto(sockfd,buf,strlen(buf),,(struct sockaddr*)&clieaddr,sizeof(clieaddr));
         sleep();
     }
     close(sockfd);

     return ;
 }

client.c

 #include<stdio.h>
 #include<stdlib.h>
 #include<strings.h>
 #include<string.h>
 #include<sys/socket.h>
 #include<unistd.h>
 #include<sys/types.h>
 #include<arpa/inet.h>

 #define SERVER_PORT 8000
 #define CLIENT_PORT 9000
 #define MAXLINE 4096

 int main(int argc,char* argv[])
 {
     struct sockaddr_in localaddr;
     int confd;
     ssize_t len;
     char buf[MAXLINE];
     //1.创建一个socket
     confd = socket(AF_INET,SOCK_DGRAM,);
     //初始化本地地址
     bzero(&localaddr,sizeof(localaddr));
     localaddr.sin_family = AF_INET;
     inet_pton(AF_INET,"0.0.0.0",&localaddr.sin_addr.s_addr);
     localaddr.sin_port = htons(CLIENT_PORT);

     int ret = bind(confd,(struct sockaddr*)&localaddr,sizeof(localaddr));
     if(ret == )
     {
         printf("...bind ok...\n");
     }
     while()
     {
         len = recvfrom(confd,buf,sizeof(buf),,NULL,);
         write(STDOUT_FILENO,buf,len);
     }
     close(confd);

     return ;
 }

测试结果：