Date: Thu, 14 Oct 2004 08:01:49 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: Grigory Klyuchnikov <grn@ispras.ru> Cc: snap-users@kame.net Subject: Re: Get multicast addresses from interface Message-ID: <20041014150149.GB26684@odin.ac.hmc.edu> In-Reply-To: <416E82D9.80002@ispras.ru> References: <416E82D9.80002@ispras.ru>
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On Thu, Oct 14, 2004 at 05:44:57PM +0400, Grigory Klyuchnikov wrote:
> Hello,
>=20
> How can a user process get IPv6 multicast addresses of ethernet
> interfaces? I have FreeBSD 5.2.1 and get interface addresses
> via ioctl(SIOCGIFCONF) or sysctl(witch NET_RT_IFLIST),
> but all returned addresses are unicast.
getifaddrs(3) and getifmaddrs(3) may do what you want.
> In net/if.h there is a struct ifma_msghdr:
>=20
> /*
> * Message format for use in obtaining information about multicast addres=
ses
> * from the routing socket
> */
> struct ifma_msghdr {
> u_short ifmam_msglen; /* to skip over non-understood messages */
> u_char ifmam_version; /* future binary compatibility */
> u_char ifmam_type; /* message type */
> int ifmam_addrs; /* like rtm_addrs */
> int ifmam_flags; /* value of ifa_flags */
> u_short ifmam_index; /* index for associated ifp */
> };
>=20
>=20
> How it may be used?
In addition to the functions above, you can directly access these
structures via sysctl (see src/lib/libc/net/getifmaddrs.c for an
example).
-- Brooks
--=20
Any statement of the form "X is the one, true Y" is FALSE.
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