怎么查什么时候做的网站,前端网站开发实例,wordpress二级分类,网站突然掉排名问题描述#xff1a; 自己在vmware中搭建了2台虚拟机#xff0c;虚拟机A向虚拟机A和虚拟机B发送广播信息#xff0c;接收端在虚拟机A和虚拟机B#xff0c;这个时候#xff0c;由于没配置sin.sin_addr.s_addr htonl(INADDR_ANY);#xff0c;而是配置的inet_pton(AF_INET,…问题描述 自己在vmware中搭建了2台虚拟机虚拟机A向虚拟机A和虚拟机B发送广播信息接收端在虚拟机A和虚拟机B这个时候由于没配置sin.sin_addr.s_addr htonl(INADDR_ANY);而是配置的inet_pton(AF_INET, SERV_IP, sin.sin_addr.s_addr);导致虚拟机A的广播信号发出去了但是虚拟机B和虚拟机A完全收不到UDP广播数据。 要点 在发送端配置 // 设置允许广播数据 int b_br 1; setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, b_br, sizeof(int));在接收端配置 sin.sin_addr.s_addr htonl(INADDR_ANY);绑定到任意接口 // receive.c
#include stdio.h
#include stdlib.h
#include string.h
#include strings.h
#include sys/types.h
#include sys/socket.h
#include netinet/ip.h
#include arpa/inet.h
#include netinet/in.h
#include unistd.h#define SERV_PORT 5001
#define SERV_IP 192.168.32.133int main(int argc, char *argv[])
{int sockfd;struct sockaddr_in sin;struct in_addr sinp;char buf[BUFSIZ];// 1. 创建socketif((sockfd socket(AF_INET, SOCK_DGRAM, 0)) 0){perror(socket);exit(1);}// int b_br 1;
// setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, b_br, sizeof(int));// 2. 绑定服务器sin.sin_family AF_INET;sin.sin_port htons(SERV_PORT);// inet_pton(AF_INET, SERV_IP, sin.sin_addr.s_addr);sin.sin_addr.s_addr htonl(INADDR_ANY);bzero(sin.sin_zero, 8);if(bind(sockfd, (struct sockaddr *)sin, sizeof(sin)) 0){perror(bind);exit(1);}// 3. 从客户端接收while(1){int recvlen -1;struct sockaddr_in srcaddrin;char srcaddr[16];int port -1, addrlen;recvlen recvfrom(sockfd, buf, BUFSIZ, 0, (struct sockaddr*)srcaddrin, addrlen);inet_ntop(AF_INET, srcaddrin.sin_addr.s_addr, srcaddr, sizeof(srcaddrin));port ntohs(srcaddrin.sin_port);if(recvlen 0) printf(Client (%s:%d) is orderly shutdown\n, srcaddr, port);else if(recvlen 0){perror(recvfrom);break;}else {// 接收到recvlen个数据if(strncasecmp(quit, buf, 4) 0) break;printf(Client (%s:%d) recv data len%d, addrlen%d from client: %s\n, srcaddr, port, recvlen, addrlen, buf);}}// 4. 处理业务// 5. 发送数据close(sockfd);return 0;
}
// sender.c
#include stdio.h
#include stdlib.h
#include string.h
#include strings.h
#include sys/types.h
#include sys/socket.h
#include netinet/ip.h
#include arpa/inet.h
#include netinet/in.h
#include unistd.h#define SERV_PORT 5001
#define SERV_IP 192.168.32.255int main(int argc, char *argv[])
{int sockfd;struct sockaddr_in sin;struct in_addr sinp;char buf[BUFSIZ];// 1. 创建socketif((sockfd socket(AF_INET, SOCK_DGRAM, 0)) 0){perror(socket);exit(1);}// 设置允许广播数据int b_br 1;setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, b_br, sizeof(int));// 2. 发送消息sendtosin.sin_family AF_INET;sin.sin_port htons(SERV_PORT);inet_pton(AF_INET, SERV_IP, sin.sin_addr.s_addr);bzero(sin.sin_zero, 8);while(1){if(fgets(buf, BUFSIZ, stdin) NULL){perror(fgets);continue;}sendto(sockfd, buf, BUFSIZ, 0, (struct sockaddr *)sin, sizeof(sin));if(strncasecmp(quit, buf, 4) 0) break;}close(sockfd);return 0;
}
