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k8s笔记17(组播测试代码)

驚鴻飛雪 2024-01-28 阅读 9

摘要:

mc_svcttl;mc_clittl;mcjoin;smcrouted

  • k8s笔记13(SMCRoute)_ATCtoK8s 空管智能运维的技术博客_51CTO博客(第2项)
  • k8s笔记14_ATCtoK8s 空管智能运维的技术博客_51CTO博客(第2、8项)

测试OK:(前提k8s-node07和k8s-node08运行smcrouted)

omping-a   172.27.29.185   k8s-node07 
omping-b   172.19.199.175  k8s-node08
root@omping-a:/# mc_svcttl 
[root@k8s-node07 home]# mcjoin  -j 234.0.0.100 -p 8888
[root@k8s-node08 ~]# mcjoin  -j 234.0.0.100 -p 8888  
root@omping-b:/# mcjoin  -j 234.0.0.100 -p 8888  
root@omping-b:/# mc_clittl 
(SO_REUSEADDR)Recv 0st message from server:BROADCAST TEST DATA 232.0.0.100:8888  TTL=64


1、多播服务程序:MCAST_ADDR "234.0.0.100"    MCAST_PORT 8888

/*
 * *broadcast_server.c - 多播服务程序
 * */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define MCAST_PORT 8888
#define MCAST_ADDR "234.0.0.100"   /*一个局部连接多播地址,路由器不进行转发*/
#define MCAST_DATA "BROADCAST TEST DATA 234.0.0.100:8888"      /*多播发送的数据*/
#define MCAST_INTERVAL 5                      /*发送间隔时间*/

int main(int argc, char*argv)
{
    int s;
    struct sockaddr_in mcast_addr;     
    s = socket(AF_INET, SOCK_DGRAM, 0);         /*建立套接字*/

    if (s == -1)
    {
        perror("socket()");
        return -1;
    }

    memset(&mcast_addr, 0, sizeof(mcast_addr));/*初始化IP多播地址为0*/
	
    mcast_addr.sin_family = AF_INET;                /*设置协议族类行为AF*/
    mcast_addr.sin_addr.s_addr = inet_addr(MCAST_ADDR);/*设置多播IP地址*/
    mcast_addr.sin_port = htons(MCAST_PORT);        /*设置多播端口*/

                                                    /*向多播地址发送数据*/
    while(1) {
        int n = sendto(s,                     /*套接字描述符*/
                       MCAST_DATA,            /*数据*/
                       sizeof(MCAST_DATA),    /*长度*/
                       0,
                       (struct sockaddr*)&mcast_addr,
                       sizeof(mcast_addr)) ;
        if( n < 0)
        {
            perror("sendto()");
            return -2;
        }      
        sleep(MCAST_INTERVAL);             /*等待一段时间*/
    }
    return 0;
}

2、多播的客户端:MCAST_ADDR "234.0.0.100"   MCAST_PORT 8888

/*
 * *broadcast_client.c - 多播的客户端
 * */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define MCAST_PORT 8888
#define MCAST_ADDR "234.0.0.100"     /*234组播地址全局有效,路由器进行转发*/
#define MCAST_INTERVAL 5                        /*发送间隔时间*/
#define BUFF_SIZE 256                           /*接收缓冲区大小*/

int main(int argc, char*argv[])
{  
    int s;                                      /*套接字文件描述符*/
    struct sockaddr_in local_addr;              /*本地地址*/
    int err = -1;

    s = socket(AF_INET, SOCK_DGRAM, 0);     /*建立套接字*/

    if (s == -1)
    {
        perror("socket()");
        return -1;
    }    
/*设定 SO_REUSEADDR,允许多个应用绑定同一个本地端口接收数据包*/
    int reuse = 1;
    if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, sizeof(reuse)) < 0)
	{
          perror("Setting SO_REUSEADDR error");
          close(s);
          exit(1);	
	}


	/*初始化地址*/
    memset(&local_addr, 0, sizeof(local_addr));

    local_addr.sin_family = AF_INET;
    local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    local_addr.sin_port = htons(MCAST_PORT); 
	
/*bind绑定本地端口,IP为INADDR_ANY,从而能接收组播数据包。*/
    err = bind(s,(struct sockaddr*)&local_addr, sizeof(local_addr)) ;

    if(err < 0)
    {
        perror("bind()");
        return -2;
    }   
                                                /*设置回环许可*/
    int loop = 1;

    err = setsockopt(s,IPPROTO_IP, IP_MULTICAST_LOOP,&loop, sizeof(loop));

    if(err < 0)
    {
        perror("setsockopt():IP_MULTICAST_LOOP");
        return -3;
    }
  
    struct ip_mreq mreq;                                    /*加入多播组*/
    mreq.imr_multiaddr.s_addr = inet_addr(MCAST_ADDR); /*多播地址*/
    mreq.imr_interface.s_addr = htonl(INADDR_ANY); /*网络接口为默认*/
 /*将本机加入多播组*/
    err = setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP,&mreq, sizeof
    (mreq));

    if (err < 0)
    {
        perror("setsockopt():IP_ADD_MEMBERSHIP");
        return -4;
    }
   
    int times = 0;
    int addr_len = 0;
    char buff[BUFF_SIZE];
    int n = 0;

	
                                        /*循环接收多播组的消息,5次后退出*/
    for(times = 0;times<15;times++)
    {
        addr_len = sizeof(local_addr);
        memset(buff, 0, BUFF_SIZE);                 /*清空接收缓冲区*/
                                                    /*接收数据*/
        n = recvfrom(s, buff, BUFF_SIZE, 0,(struct sockaddr*)&local_addr,
        &addr_len);

        if( n== -1)
        {
            perror("recvfrom()");
        }
                                                    /*打印信息*/
        printf("(SO_REUSEADDR)Recv %dst message from server:%s\n", times, buff);
        sleep(MCAST_INTERVAL);
    }
                                                    /*退出多播组*/
    err = setsockopt(s, IPPROTO_IP, IP_DROP_MEMBERSHIP,&mreq, sizeof
    (mreq));

    close(s);
    return 0;

}




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