嗨
我想在有两个NIC的机器上编写多点传送客户端,但我无法使其工作。
我可以看到一个嗅探器,一旦我启动程序的NIC(eth4)开始接收多播数据报,但是,我无法接收()我的程序中的任何。
运行时 “tshark的-i ETH4 -R udp.port == XXX(多播端口)”
我得到:
1059.435483 y.y.y.y. (某些IP) - > zzzz(多播IP,不是我的eth4 NIC IP)UDP源端口:kkk(某些其他端口)目标端口:xxx(多播端口)收听C++多点传送多点传送的问题
搜索网络的一些示例/解释,看起来像我做别人做的事情。
任何帮助将不胜感激...
谢谢!
bool connectionManager::sendMulticastJoinRequest()
{
struct sockaddr_in localSock;
struct ip_mreqn group;
char* mc_addr_str = SystemManager::Instance()->getTCP_IP_CHT();
char* local_addr_str = SystemManager::Instance()->getlocal_IP_TOLA();
int port = SystemManager::Instance()->getTCP_Port_CHT();
/* Create a datagram socket on which to receive. */
CHT_UDP_Feed_sock = socket(AF_INET, SOCK_DGRAM, 0);
if(CHT_UDP_Feed_sock < 0)
{
perror("Opening datagram socket error");
return false;
}
/* application to receive copies of the multicast datagrams. */
{
int reuse = 1;
if(setsockopt(CHT_UDP_Feed_sock, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, sizeof(reuse)) < 0)
{
perror("Setting SO_REUSEADDR error");
close(CHT_UDP_Feed_sock);
return false;
}
}
/* Bind to the proper port number with the IP address */
/* specified as INADDR_ANY. */
memset((char *) &localSock, 0, sizeof(localSock));
localSock.sin_family = AF_INET;
localSock.sin_port = htons(port);
localSock.sin_addr.s_addr =inet_addr(local_addr_str); // htonl(INADDR_ANY); //
if(bind(CHT_UDP_Feed_sock, (struct sockaddr*)&localSock, sizeof(localSock)))
{
perror("Binding datagram socket error");
close(CHT_UDP_Feed_sock);
return false;
}
/* Join the multicast group mc_addr_str on the local local_addr_str */
/* interface. Note that this IP_ADD_MEMBERSHIP option must be */
/* called for each local interface over which the multicast */
/* datagrams are to be received. */
group.imr_ifindex = if_nametoindex("eth4");
if (setsockopt(CHT_UDP_Feed_sock, SOL_SOCKET, SO_BINDTODEVICE, "eth4", 5) < 0)
return false;
group.imr_multiaddr.s_addr = inet_addr(mc_addr_str);
group.imr_address.s_addr = htonl(INADDR_ANY); //also tried inet_addr(local_addr_str); instead
if(setsockopt(CHT_UDP_Feed_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&group, sizeof(group)) < 0)
{
perror("Adding multicast group error");
close(CHT_UDP_Feed_sock);
return false;
}
// Read from the socket.
char databuf[1024];
int datalen = sizeof(databuf);
if(read(CHT_UDP_Feed_sock, databuf, datalen) < 0)
{
perror("Reading datagram message error");
close(CHT_UDP_Feed_sock);
return false;
}
else
{
printf("Reading datagram message...OK.\n");
printf("The message from multicast server is: \"%s\"\n", databuf);
}
return true;
}
重复? http://stackoverflow.com/questions/4054238/udp-multicast-from-specific-network-card – young 2011-02-25 08:42:03
不重复。它没有帮助。我可以看到多播正在获得eth4,但出于某种原因,我无法在我的套接字上看到它.. – 2011-02-26 14:57:38