int
getsourcefilter (int s, uint32_t interface, const struct sockaddr *group,
socklen_t grouplen, uint32_t *fmode, uint32_t *numsrc,
struct sockaddr_storage *slist)
{
/* We have to create an struct ip_msfilter object which we can pass
to the kernel. */
socklen_t needed = GROUP_FILTER_SIZE (*numsrc);
int use_alloca = __libc_use_alloca (needed);
struct group_filter *gf;
if (use_alloca)
gf = (struct group_filter *) alloca (needed);
else
{
gf = (struct group_filter *) malloc (needed);
if (gf == NULL)
return -1;
}
gf->gf_interface = interface;
memcpy (&gf->gf_group, group, grouplen);
gf->gf_numsrc = *numsrc;
/* We need to provide the appropriate socket level value. */
int result;
int sol = __get_sol (group->sa_family, grouplen);
if (sol == -1)
{
__set_errno (EINVAL);
result = -1;
}
else
{
result = __getsockopt (s, sol, MCAST_MSFILTER, gf, &needed);
/* If successful, copy the results to the places the caller wants
them in. */
if (result == 0)
{
*fmode = gf->gf_fmode;
memcpy (slist, gf->gf_slist,
MIN (*numsrc, gf->gf_numsrc)
* sizeof (struct sockaddr_storage));
*numsrc = gf->gf_numsrc;
}
}
if (! use_alloca)
{
int save_errno = errno;
free (gf);
__set_errno (save_errno);
}
return result;
}
int
getipv4sourcefilter (int s, struct in_addr interface, struct in_addr group,
uint32_t *fmode, uint32_t *numsrc, struct in_addr *slist)
{
/* We have to create an struct ip_msfilter object which we can pass
to the kernel. */
socklen_t needed = IP_MSFILTER_SIZE (*numsrc);
int use_alloca = __libc_use_alloca (needed);
struct ip_msfilter *imsf;
if (use_alloca)
imsf = (struct ip_msfilter *) alloca (needed);
else
{
imsf = (struct ip_msfilter *) malloc (needed);
if (imsf == NULL)
return -1;
}
imsf->imsf_multiaddr = group;
imsf->imsf_interface = interface;
imsf->imsf_numsrc = *numsrc;
int result = __getsockopt (s, SOL_IP, IP_MSFILTER, imsf, &needed);
/* If successful, copy the results to the places the caller wants
them in. */
if (result == 0)
{
*fmode = imsf->imsf_fmode;
memcpy (slist, imsf->imsf_slist,
MIN (*numsrc, imsf->imsf_numsrc) * sizeof (struct in_addr));
*numsrc = imsf->imsf_numsrc;
}
if (! use_alloca)
{
int save_errno = errno;
free (imsf);
__set_errno (save_errno);
}
return result;
}
