int
Family_to_level(int family)
{
int rc;
if ( (rc = family_to_level(family)) < 0)
err_sys("family_to_level error");
return(rc);
}
int
mcast_leave(int sockfd, const SA *grp, socklen_t grplen)
{
#ifdef MCAST_JOIN_GROUP
struct group_req req;
req.gr_interface = 0;
if (grplen > sizeof(req.gr_group))
{
errno = EINVAL;
return -1;
}
memcpy(&req.gr_group, grp, grplen);
return (setsockopt(sockfd, family_to_level(grp->sa_family),
MCAST_LEAVE_GROUP, &req, sizeof(req)));
#else
switch (grp->sa_family)
{
case AF_INET:
{
struct ip_mreq mreq;
memcpy(&mreq.imr_multiaddr,
&((const struct sockaddr_in *) grp)->sin_addr,
sizeof(struct in_addr));
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
return(setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
&mreq, sizeof(mreq)));
}
#ifdef IPV6
#ifndef IPV6_LEAVE_GROUP /* APIv0 compatibility */
#define IPV6_LEAVE_GROUP IPV6_DROP_MEMBERSHIP
#endif
case AF_INET6:
{
struct ipv6_mreq mreq6;
memcpy(&mreq6.ipv6mr_multiaddr,
&((const struct sockaddr_in6 *) grp)->sin6_addr,
sizeof(struct in6_addr));
mreq6.ipv6mr_interface = 0;
return(setsockopt(sockfd, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
&mreq6, sizeof(mreq6)));
}
#endif
default:
errno = EAFNOSUPPORT;
return(-1);
}
#endif
}
int
mcast_leave_source_group(int sockfd, const SA *src, socklen_t srclen,
const SA *grp, socklen_t grplen)
{
#ifdef MCAST_LEAVE_SOURCE_GROUP
struct group_source_req req;
req.gsr_interface = 0;
if (grplen > sizeof(req.gsr_group) || srclen > sizeof(req.gsr_source))
{
errno = EINVAL;
return -1;
}
memcpy(&req.gsr_group, grp, grplen);
memcpy(&req.gsr_source, src, srclen);
return (setsockopt(sockfd, family_to_level(grp->sa_family),
MCAST_LEAVE_SOURCE_GROUP, &req, sizeof(req)));
#else
switch (grp->sa_family)
{
#ifdef IP_DROP_SOURCE_MEMBERSHIP
case AF_INET:
{
struct ip_mreq_source mreq;
memcpy(&mreq.imr_multiaddr,
&((struct sockaddr_in *) grp)->sin_addr,
sizeof(struct in_addr));
memcpy(&mreq.imr_sourceaddr,
&((struct sockaddr_in *) src)->sin_addr,
sizeof(struct in_addr));
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
return(setsockopt(sockfd, IPPROTO_IP, IP_DROP_SOURCE_MEMBERSHIP,
&mreq, sizeof(mreq)));
}
#endif
#ifdef IPV6
case AF_INET6: /* IPv6 source-specific API is MCAST_LEAVE_SOURCE_GROUP */
#endif
default:
errno = EAFNOSUPPORT;
return(-1);
}
#endif
}
int
mcast_join(int sockfd, const struct sockaddr *grp, socklen_t grplen, const char *ifname, u_int ifindex)
{
#ifdef MCAST_JOIN_GROUP
struct group_req req;
if (ifindex > 0) {
req.gr_interface = ifindex;
} else if (ifname != NULL) {
if ( (req.gr_interface = if_nametoindex(ifname)) == 0) {
errno = ENXIO; /* i/f name not found */
return -1;
}
} else req.gr_interface = 0;
if (grplen > sizeof(req.gr_group)) {
errno = EINVAL;
return -1;
}
memcpy(&req.gr_group, grp, grplen);
return setsockopt(sockfd, family_to_level(grp->sa_family), MCAST_JOIN_GROUP, &req, sizeof(req));
#else
/* end mcast_join1 */
/* include mcast_join2 */
switch (grp->sa_family) {
case AF_INET:
struct ip_mreqn mreq;
struct ifreq ifreq;
memcpy(&mreq.imr_multiaddr,\
&((const struct sockaddr_in *) grp)->sin_addr,\
sizeof(struct in_addr));
if (ifindex > 0) {
if (if_indextoname(ifindex, ifreq.ifr_name) == NULL) {
errno = ENXIO; /* i/f index not found */
return -1;
}
goto doioctl;
} else if (ifname != NULL) {
strncpy(ifreq.ifr_name, ifname, IFNAMSIZ);
doioctl:
if (ioctl(sockfd, SIOCGIFADDR, &ifreq) < 0) return -1;
memcpy(&mreq.imr_interface,\
&((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr,\
sizeof(struct in_addr));
} else mreq.imr_interface.s_addr = htonl(INADDR_ANY);
return setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
/* end mcast_join2 */
/* include mcast_join3 */
#ifdef IPV6
#ifndef IPV6_JOIN_GROUP /* APIv0 compatibility */
#define IPV6_JOIN_GROUP IPV6_ADD_MEMBERSHIP
#endif
case AF_INET6:
struct ipv6_mreq mreq6;
memcpy(&mreq6.ipv6mr_multiaddr,\
&((const struct sockaddr_in6 *) grp)->sin6_addr,\
sizeof(struct in6_addr));
if (ifindex > 0) mreq6.ipv6mr_interface = ifindex;
else if (ifname != NULL) {
if ( (mreq6.ipv6mr_interface = if_nametoindex(ifname)) == 0) {
errno = ENXIO; /* i/f name not found */
return -1;
}
} else mreq6.ipv6mr_interface = 0;
return setsockopt(sockfd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, sizeof(mreq6));
#endif
default:
errno = EAFNOSUPPORT;
return -1;
}
#endif
}
