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python中使用socket作组播

2010-09-20 09:54:14| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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组播的socket套接字选项是IPPROTO_IP(level)，IP_ADD_MEMBERSHIP(option)，ip_mreq(value)
从/usr/include/linux/in.h中查到ip_mreq的结构为
struct ip_mreq
{
struct in_addr imr_multiaddr; /* IP multicast address of group */
struct in_addr imr_interface; /* local IP address of interface */
};
而在python中没有对应的类型，所以要用struct来构造一个
首先将struct import进来，然后使用struct.pack将两个地址进行打包，返回值即可作为setsockopt的值参数
mreq=struct.pack("4sl",inet_aton("224.0.0.123"),INADDR_ANY)
s.setsockopt(IPPROTO_IP,IP_ADD_MEMBERSHIP,mreq)
然后要将设置这个选项，告诉服务器要往Internet上组播，<32的值表示在局域网内，>32表示往互联网上发
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 255)
遗憾的是，组播还需要路由设备的支持，实际支持情况并不乐观。

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