Linux系统下UDP发送和接收广播消息小例子

时间:2022-12-15 16:52:01
// 发送端
#include <iostream>
#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/types.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>


using namespace std;

int main()
{
setvbuf(stdout, NULL, _IONBF, 0);
fflush(stdout);

int sock = -1;
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
cout<<"socket error"<<endl;
return false;
}

const int opt = 1;
//设置该套接字为广播类型,
int nb = 0;
nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));
if(nb == -1)
{
cout<<"set socket error..."<<endl;
return false;
}

struct sockaddr_in addrto;
bzero(&addrto, sizeof(struct sockaddr_in));
addrto.sin_family=AF_INET;
addrto.sin_addr.s_addr=htonl(INADDR_BROADCAST);
addrto.sin_port=htons(6000);
int nlen=sizeof(addrto);

while(1)
{
sleep(1);
//从广播地址发送消息
char smsg[] = {"abcdef"};
int ret=sendto(sock, smsg, strlen(smsg), 0, (sockaddr*)&addrto, nlen);
if(ret<0)
{
cout<<"send error...."<<ret<<endl;
}
else
{
printf("ok ");
}
}

return 0;
}

 

// 接收端 http://blog.csdn.net/robertkun

#include <iostream>
#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/types.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>


using namespace std;

int main()
{
setvbuf(stdout, NULL, _IONBF, 0);
fflush(stdout);

// 绑定地址
struct sockaddr_in addrto;
bzero(&addrto, sizeof(struct sockaddr_in));
addrto.sin_family = AF_INET;
addrto.sin_addr.s_addr = htonl(INADDR_ANY);
addrto.sin_port = htons(6000);

// 广播地址
struct sockaddr_in from;
bzero(&from, sizeof(struct sockaddr_in));
from.sin_family = AF_INET;
from.sin_addr.s_addr = htonl(INADDR_ANY);
from.sin_port = htons(6000);

int sock = -1;
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
cout<<"socket error"<<endl;
return false;
}

const int opt = 1;
//设置该套接字为广播类型,
int nb = 0;
nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt));
if(nb == -1)
{
cout<<"set socket error..."<<endl;
return false;
}

if(bind(sock,(struct sockaddr *)&(addrto), sizeof(struct sockaddr_in)) == -1)
{
cout<<"bind error..."<<endl;
return false;
}

int len = sizeof(sockaddr_in);
char smsg[100] = {0};

while(1)
{
//从广播地址接受消息
int ret=recvfrom(sock, smsg, 100, 0, (struct sockaddr*)&from,(socklen_t*)&len);
if(ret<=0)
{
cout<<"read error...."<<sock<<endl;
}
else
{
printf("%s\t", smsg);
}

sleep(1);
}

return 0;
}


自已在Linux虚拟机下测试可以成功, 前提是要把主机设置在同一网段内, 还有就是不要忘记关闭Linux的防火墙.. 可以使用setup命令进行设置。

(我在测试的时候只能发送不收接收,折磨了我半天,后来才想到是Linux防火墙的问题。。)

 

关于虚拟机的网卡配置,建议选择桥接模式。NAT的模式的话,是受限制的,可能会收不到广播消息。

具体的参考网上的文章吧。。

祝你成功。。