在Python中发送和接收IPv6链路本地多播UDP数据报?

这里有一个链接 python mcast demo ,同时执行IPv4和IPv6。

我正在问一个问题 here 这涉及到获取接收到的消息的多播地址,但是源代码回答了您的问题!

倾听:

# Initialise socket for IPv6 datagrams
sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM, socket.IPPROTO_UDP)

# Allows address to be reused
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

# Binds to all interfaces on the given port
sock.bind(('', 8080))

# Allow messages from this socket to loop back for development
sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_LOOP, True)

# Construct message for joining multicast group
mreq = struct.pack("16s15s".encode('utf-8'), socket.inet_pton(socket.AF_INET6, "ff02::abcd:1"), (chr(0) * 16).encode('utf-8'))
sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mreq)

data, addr = sock.recvfrom(1024)

发送:

# Create ipv6 datagram socket
sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
# Allow own messages to be sent back (for local testing)
sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_LOOP, True)
sock.sendto("hello world".encode('utf-8'), ("ff02::abcd:1", 8080))

这是针对python3.6的,对于python2.7,我认为没有必要进行编码。同样在struct.pack系列中,我也看到了“16s15s”的变体,比如“4s”,但我不知道它是什么,也不知道我为自己做了什么!