1.前言

UDP组播测试对于局域网内数据链路测试十分必要，轻量化和易用性是首要考虑的问题，使用mping作为UDP组播测试工具，能够非常方便的进行linux、Windows等平台的组播测试。本文第4章还提供了基于C/C++的udp_sender和udp_reciver组播源码，可以在Linux下编译执行。

2.mping工具编译

GITHUB：https://github.com/tongxinCode/mping
或使用如下链接（go源码+build可执行程序）
CSDN:https://download.csdn.net/download/Axugo/89070577
官方给出的编译方法：

# windows
SET CGO_ENABLED=0
SET GOOS=windows
SET GOARCH=amd64
go build -o mping.exe main.go
# linux
SET CGO_ENABLED=0
SET GOOS=linux 
SET GOARCH=amd64 
go build -o mping main.go
# linux arm
SET CGO_ENABLED=0
SET GOOS=linux
SET GOARCH=arm
go build -o mping main.go

3.mping工具使用

以Windows为例，将编译好的mping.exe拷贝至C:\Windows\System32路径下，即可全局使用

3.1 参数说明

mping.exe -h

可以得到如下

mping version: mping/1.8.1
Usage: ./mping [-h] [-s sendGroup] [-r receiveGroup] [-l localAddress] [-S sourceAddress] [-m message] [-i interval] [-log path]

Options:
  -C int
        [number] the limit number of sending packets(-1 means no limits) (default -1)
  -S string
        [ip[:port]] must determine the peer source ip if using SSM (default "127.0.0.1:8888")
  -c    whether to count Packet loss rate(default false)
  -e string
        ['ascii','utf8','gbk'] change the content of sending (default "ascii")
  -h    this help
  -i int
        [number] change the interval between package sent (unit:Nanosecond) (default 1000000000)
  -l string
        [ip[:port]] must choose your local using interface (default "127.0.0.1:8888")
  -log string
        [/tmp/] or [C:\] determine whether to log, Path e.g ./, Forbidden / (default "/")
  -m string
        [string] change the content of sending (default "Init Data")
  -p int
        [number] the size of payload data(0 means use 1472 Bytes payloads) (default -1)
  -proto string
        choose a lua script to parse udp data, function Parse(dataBytes) must be included (default "*.lua")
  -r string
        [group:port] receive packet from group (default "239.255.255.255:9999")
  -s string
        [group:port] send packet to group (default "239.255.255.255:9999")
  -test
        send and receive locally to examinate a test(default false)
  -time
        send real time as the content to examinate(default false)
  -x    whether to show the hex data(default false)

3.1 组播播发（-s）

将组播信息播发至本机的19901端口

mping.exe -s 127.0.0.1:19901

3.1 组播播发（-r）

从19901端口接收播发的组播信息

mping.exe -r 224.0.0.8:19901

3.3 Linux下mping测试

4.Linux组播udp_sender及udp_reciver使用

4.1 udp_sender源码

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

//#define MULTICAST_GROUP "224.0.0.1"
//#define PORT 10000

int main(int argc,char *argv[]) {
    if(argc<3)
    {
        printf("ERROR: argc<3 !\n");
        printf("Example: ./udp_sender 224.0.0.8 18044 \n\n");
        return 0;
    }
    int PORT=atoi(argv[2]);
    char *MULTICAST_GROUP=argv[1];

    struct sockaddr_in addr;
    int sock;
    char message[] = "This is a multicast test message...";

    // 创建UDP套接字
    sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock < 0) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

    // 设置组播TTL（生存时间）
    int ttl = 1;
    if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0) {
        perror("setsockopt failed");
        exit(EXIT_FAILURE);
    }

    // 设置组播目标地址和端口
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = inet_addr(MULTICAST_GROUP);
    addr.sin_port = htons(PORT);

    while (1) {
        // 发送消息
        if (sendto(sock, message, strlen(message), 0, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
            perror("sendto failed");
            exit(EXIT_FAILURE);
        }
        printf("udp_sender send msg to %s %d YES!\n\n",MULTICAST_GROUP,PORT);

        sleep(1);  // 每秒发送一次消息
    }

    // 关闭套接字
    close(sock);

    return 0;
}

4.1 udp_reciver源码

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

//#define MULTICAST_GROUP "224.0.0.1"
//#define PORT 10000
#define MAX_BUFFER_SIZE 1024

//第一个参数：组播IP 
//第二个参数：组播端口

int main(int argc,char *argv[]) {

    if(argc<3)
    {
        printf("ERROR: argc<3 !\n");
        printf("Example: ./udp_reciver 224.0.0.8 18044 \n\n");
        return 0;
    }
    int PORT=atoi(argv[2]);
    char *MULTICAST_GROUP=argv[1];
    struct sockaddr_in addr;
    int sock;
    char buffer[MAX_BUFFER_SIZE];
    ssize_t nbytes;

    // 创建UDP套接字
    sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock < 0) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

    // 设置套接字选项，允许多个进程绑定到相同的地址和端口
    int reuse = 1;
    if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
        perror("setsockopt failed");
        exit(EXIT_FAILURE);
    }

    // 绑定到特定地址和端口
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = htonl(INADDR_ANY);
    addr.sin_port = htons(PORT);
    if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // 加入组播组
    struct ip_mreq mreq;
    mreq.imr_multiaddr.s_addr = inet_addr(MULTICAST_GROUP);
    mreq.imr_interface.s_addr = htonl(INADDR_ANY);
    if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&mreq, sizeof(mreq)) < 0) {
        perror("setsockopt failed");
        exit(EXIT_FAILURE);
    }

    printf("wait receive multimessage...\n");

    while (1) {
        // 接收消息
        nbytes = recvfrom(sock, buffer, sizeof(buffer), 0, NULL, 0);
        if (nbytes < 0) {
            perror("recvfrom failed");
            exit(EXIT_FAILURE);
        }

        printf("Have receive multimessage from %s %d\n",MULTICAST_GROUP,PORT);
        printf("%.*s\n", (int)nbytes, buffer);
    }

    // 关闭套接字
    close(sock);

    return 0;
}

4.3 编译方法

gcc sender.c -o udp_sender
gcc recver.c -o udp_reciver

4.4 测试使用

4.4.1 udp_sender

./udp_sender 224.0.0.8 19901

4.4.2 udp_reciver

./udp_reciver 224.0.0.8 19901