Dear Lukas,
Experimenting with multicast, I found it convenient to be able to set
the interface for multicast traffic. My suggestion allows setting this
interface. It might be handy to have a overloaded version or to use two
different procedures. It let this up to you to decide whatever is better
for compatibility with other platforms.
Also I did not yet cover the IP6 part.
---
procedure TUDPBlockSocket.AddMulticast(MCastIP, MCastInAddr: string);
var
Multicast: TIP_mreq;
Multicast6: TIPv6_mreq;
n: integer;
ip6: Tip6bytes;
begin
if FIP6Used then
begin
ip6 := StrToIp6(MCastIP);
for n := 0 to 15 do
Multicast6.ipv6mr_multiaddr.u6_addr8[n] := Ip6[n];
Multicast6.ipv6mr_interface := 0;
SockCheck(synsock.SetSockOpt(FSocket, IPPROTO_IPV6, IPV6_JOIN_GROUP,
PAnsiChar(@Multicast6), SizeOf(Multicast6)));
end
else
begin
if MCastInAddr='' then
MCastInAddr := cAnyHost;
Multicast.imr_multiaddr.S_addr := swapbytes(strtoip(MCastIP));
Multicast.imr_interface.S_addr := swapbytes(strtoip(MCastInAddr));
SockCheck(synsock.SetSockOpt(FSocket, IPPROTO_IP, IP_ADD_MEMBERSHIP,
PAnsiChar(@Multicast), SizeOf(Multicast)));
end;
ExceptCheck;
end;
---
Best regards
Thomas Kerkmann
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