getting multicast source IP address on Linux

Question

I'm using at struct sockaddr_in to receive multicast data sent out from another machine. When I print out the source address using inet_ntop it gives me the source address of the PC that sent the data.

I would like to know if there is a way of getting the multicast address that the data was 'sent to'?

Look at the destination address field and use inet_ntop? – jørgensen Apr 21 '12 at 23:49 — jørgensen, Apr 21 '12 at 23:49

score 1 · Accepted Answer · answered Apr 22 '12 at 00:27

1

Use setsockopt(2) to set the IP_PKTINFO option (see ip(7)) on your receiving socket. Then use recvmsg(2) to collect incoming datagrams, with the msg_control and msg_controllen fields of its msg argument referring to a buffer where the datagram's destination address can be captured.

Systems other than Linux might provide this capability through the BSD IP_RECVDSTADDR option instead.

answered Apr 22 '12 at 00:27

ottomeister

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http://stackoverflow.com/questions/5281409/get-destination-address-of-a-received-udp-packet – Dima Apr 24 '12 at 23:46

getting multicast source IP address on Linux

1 Answers1