On Thu, Oct 14, 2004 at 05:44:57PM +0400, Grigory Klyuchnikov wrote: > Hello, > > 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:
>
> /*
> * Message format for use in obtaining information about multicast addresses
> * 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 */
> };
>
>
> 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
--
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