問題描述：
自己在vmware中搭建了2臺虛擬機，虛擬機A向虛擬機A和虛擬機B發(fā)送廣播信息，接收端在虛擬機A和虛擬機B，這個時候，由于沒配置sin.sin_addr.s_addr = htonl(INADDR_ANY);，而是配置的inet_pton(AF_INET, SERV_IP, &sin.sin_addr.s_addr);，導(dǎo)致虛擬機A的廣播信號發(fā)出去了，但是虛擬機B和虛擬機A完全收不到UDP廣播數(shù)據(jù)。

要點：文章來源地址http://www.zghlxwxcb.cn/news/detail-816464.html

1. 在發(fā)送端配置
   // 設(shè)置允許廣播數(shù)據(jù)
   int b_br = 1;
   setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &b_br, sizeof(int));
2. 在接收端配置
   sin.sin_addr.s_addr = htonl(INADDR_ANY);綁定到任意接口

// 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 "192.168.32.133"

int main(int argc, char *argv[])
{
	int sockfd;
	struct sockaddr_in sin;
	struct in_addr sinp;
	char buf[BUFSIZ];

	// 1. 創(chuàng)建socket
	if((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. 綁定服務(wù)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. 從客戶端接收
	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個數(shù)據(jù)
			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. 處理業(yè)務(wù)

	// 5. 發(fā)送數(shù)據(jù)

	
	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 "192.168.32.255"

int main(int argc, char *argv[])
{
	int sockfd;
	struct sockaddr_in sin;
	struct in_addr sinp;
	char buf[BUFSIZ];

	// 1. 創(chuàng)建socket
	if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
	{
		perror("socket");
		exit(1);
	}

	// 設(shè)置允許廣播數(shù)據(jù)
	int b_br = 1;
	setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &b_br, sizeof(int));

	// 2. 發(fā)送消息sendto
	sin.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;
}

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