Question

我从UDP嗅探器的多播接收数据，但仅在IPv4中。我的代码看起来像这样，

try:
    s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_UDP)
except socket.error as msg:
    print('Socket could not be created. Error Code : ' + str(msg[0]) + ' Message ' + msg[1])
    sys.exit()

mreq = struct.pack("4sl", socket.inet_aton('239.255.11.3'), socket.INADDR_ANY)
# receive a packet

s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)

packet = s.recvfrom(65000)

但是我只在设置IPv4地址时才接收数据，并且我也希望从IPv6多播地址接收数据。我会非常感激任何想法并抱歉我的英语。 ;-)

Answer 1

此示例在Windows中的FF02 :: 158（IoTivity UDP CoAP）上获得多播

import socket
import struct

address = ('', 5683)
interface_index = 0  # default

sock = socket.socket(family=socket.AF_INET6, type=socket.SOCK_DGRAM)
sock.bind(address)
for group in ['ff02::158']:  # multiple addresses can be specified
    sock.setsockopt(
        41,  # socket.IPPROTO_IPV6 = 41 - not found in windows 10, bug python
        socket.IPV6_JOIN_GROUP,
        struct.pack(
            '16si',
            socket.inet_pton(socket.AF_INET6, group),
            interface_index
        )
    )

while True:
    data, sender = sock.recvfrom(1500)
    while data[-1:] == '\0': data = data[:-1]  
    print(str(sender) + '  ' + repr(data))

Answer 2

您需要使用sockopt IPV6_ADD_MEMBERSHIP，因为IPv6和IPv4之间的API略有不同。 This就是一个很好的例子。

Answer 3

这就是我在my code中所做的事情：

mc_address = ipaddress.IPv6Address('ff02::1:2')
listen_port = 547
interface_index = socket.if_nametoindex('eth0')

mc_sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
mc_sock.bind((str(mc_address), listen_port, 0, interface_index))
mc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP,
                   struct.pack('16sI', mc_address.packed, interface_index))

这适用于DHCPv6服务器，但您可以理解。

如果您还希望获得自己传输的组播数据包，则必须添加：

mc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_LOOP, 1)

IPv6中的RAW套接字UDP组播

3 个答案: