C-UDP-广播模型

来源：互联网发布：java if 缩写编辑：程序博客网时间：2024/05/21 11:21

服务端

#include <string.h>#include <stdio.h>#include <unistd.h>#include <arpa/inet.h>#include <ctype.h>#include <stdlib.h>#define SERVER_PORT 8000#define CLIENT_PORT 9000#define MAXLINE 1500#define BROADCAST_IP "192.168.2.255"int main(){    int sockfd;    struct sockaddr_in serveraddr, clientaddr;    char buf[MAXLINE];    /* 构造用于udp通信的套接字 */    sockfd=socket(AF_INET, SOCK_DGRAM, 0);    bzero(&serveraddr,sizeof(serveraddr));    serveraddr.sin_family =AF_INET;    serveraddr.sin_addr.s_addr=htonl(INADDR_ANY);   /* 本地任意IP */    serveraddr.sin_port = htons(SERVER_PORT);    bind(sockfd,(struct sockaddr *)&serveraddr,sizeof(serveraddr));    int flag=1;    setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &flag, sizeof(flag));    /* 构造 client 地址 IP+端口 192.168.14.255+9000 */    bzero(&clientaddr,sizeof(serveraddr));    clientaddr.sin_family= AF_INET;    inet_pton(AF_INET,BROADCAST_IP,&clientaddr.sin_addr.s_addr);    clientaddr.sin_port =htons(CLIENT_PORT);    int i=0;    while(1){        sprintf(buf,"Drink %d glasses of water\n",i++);        sendto(sockfd,buf,strlen(buf),0,(struct sockaddr *)&clientaddr,sizeof(clientaddr));        sleep(1);    }    close(sockfd);    return 0;}

客户端

#include <stdio.h>#include <string.h>#include <unistd.h>#include <arpa/inet.h>#include <ctype.h>#define SERVER_PORT 8000#define MAXLINE 4096#define CLIENT_PORT 9000int main(){    struct sockaddr_in localaddr;    int confd;    ssize_t len;    char buf[MAXLINE];    confd=socket(AF_INET,SOCK_DGRAM,0);    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 ==0)        printf(" bind ok  \n");    while(1){        len=recvfrom(confd,buf,sizeof(buf),0,NULL,0);        write(STDOUT_FILENO,buf,len);    }    close(confd);    return 0;}

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