linux端组播测试代码

Linux端组播网络测试客户端和服务器端

服务器端循环输入发送

客户端接收并打印

客户端：

#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <errno.h>

#define BUFLEN 255

int
main (int argc, char **argv)
{
    struct sockaddr_in peeraddr,ia;
    int sockfd;
    char recmsg[BUFLEN + 1];
    unsigned int socklen, n;
    struct ip_mreq mreq;

    /* 创建 socket 用于UDP通讯 */
    sockfd = socket (AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0)
    {
        printf ("socket creating err in udptalk\n");
        exit (1);
    }
    /* 设置要加入组播的地址 */
    bzero(&mreq, sizeof (struct ip_mreq));

    inet_pton(AF_INET,"226.0.1.192",&ia.sin_addr);
    /* 设置组地址 */
    bcopy (&ia.sin_addr.s_addr, &mreq.imr_multiaddr.s_addr, sizeof (struct in_addr));
    /* 设置发送组播消息的源主机的地址信息 */
    mreq.imr_interface.s_addr = htonl (INADDR_ANY);
   // mreq.imr_interface.s_addr = inet_addr("192.168.0.88");

    /* 把本机加入组播地址，即本机网卡作为组播成员，只有加入组才能收到组播消息 */
    if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,sizeof (struct ip_mreq)) == -1)
    {
        perror ("asdfsetsockopt");
        exit (-1);
    }

    socklen = sizeof (struct sockaddr_in);
    memset (&peeraddr, 0, socklen);
    peeraddr.sin_family = AF_INET;
    peeraddr.sin_port = htons (7838);
    inet_pton(AF_INET, "226.0.1.192", &peeraddr.sin_addr);

    /* 绑定自己的端口和IP信息到socket上 */
    if (bind(sockfd, (struct sockaddr *) &peeraddr,sizeof (struct sockaddr_in)) == -1)
    {
        printf ("Bind error\n");
        exit (0);
    }

    /* 循环接收网络上来的组播消息 */
    for (;;)
    {
        bzero (recmsg, BUFLEN + 1);
        n = recvfrom (sockfd, recmsg, BUFLEN, 0, (struct sockaddr *) &peeraddr, &socklen);
        if (n < 0)
        {
            printf ("recvfrom err in udptalk!\n");
            exit (4);
        }
        else{
        /* 成功接收到数据报 */
            recmsg[n] = 0;
            printf ("peer:%s", recmsg);
        }

    }

}
服务器端：

#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define BUFLEN 255

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

    struct sockaddr_in peeraddr, myaddr;
    int sockfd;
    char recmsg[BUFLEN + 1];
    unsigned int socklen;
    socklen = sizeof (struct sockaddr_in);

    /* 创建 socket 用于UDP通讯 */
    sockfd = socket (AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0)
    {
        printf ("socket creating error\n");
        exit (1);
    }

    /* 设置对方的端口和IP信息 */
    memset (&peeraddr, 0, socklen);
    peeraddr.sin_family = AF_INET;
    peeraddr.sin_port = htons (7838);
   inet_pton (AF_INET, "226.0.1.192", &peeraddr.sin_addr);
// inet_pton (AF_INET, "192.168.0.100", &peeraddr.sin_addr);

/* 设置自己的端口和IP信息 */
    memset (&myaddr, 0, socklen);
    myaddr.sin_family = AF_INET;
    myaddr.sin_port = htons (23456);
   // myaddr.sin_addr.s_addr = inet_addr("192.168.0.88") ;
    myaddr.sin_addr.s_addr = htonl (INADDR_ANY) ;

    /* 绑定自己的端口和IP信息到socket上 */
    if (bind (sockfd, (struct sockaddr *) &myaddr,     sizeof (struct sockaddr_in)) == -1)
    {
        printf ("Bind error\n");
        exit (0);
    }

    /* 循环接受用户输入的消息发送组播消息 */
    for (;;)
    {
        /* 接受用户输入 */
        bzero (recmsg, BUFLEN + 1);
        if (fgets (recmsg, BUFLEN, stdin) == (char *) EOF)
            exit (0);

        /* 发送消息 */
        if (sendto(sockfd, recmsg, strlen (recmsg), 0, (struct sockaddr *) &peeraddr, sizeof (struct sockaddr_in)) < 0)
        {
            printf ("sendto error!\n");
            exit (3);
        }

        printf ("'%s' send ok\n", recmsg);
    }
}

(责任编辑：IT)

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linux端组播测试代码