ip.7p (2010 09)

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IP(7P) IP(7P)

gr_interface ﬁeld holds the interface index of a local interface, or zero. If the interface address is

INADDR_ANY, or if the interface index is zero, the system chooses a multicast group by matching the

multicast address only. For example:

struct ip_mreq mreq;

mreq.imr_multiaddr.s_addr = inet_addr("224.1.2.3");

mreq.imr_interface.s_addr = INADDR_ANY;

setsockopt(s, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));

struct group_req gr;

struct sockaddr_in *sin;

sin = (struct sockaddr_in *)&gr.gr_group;

bzero(sin, sizeof(*sin));

sin->sin_family = AF_INET;

sin->sin_addr.s_addr = inet_addr("224.1.2.3");

gr.gr_interface = 0;

setsockopt(s, IPPROTO_IP, MCAST_LEAVE_GROUP, &gr, sizeof(gr));

IP_BLOCK_SOURCE

and MCAST_BLOCK_SOURCE

add a source address to the list of sources being

blocked.

IP_UNBLOCK_SOURCE

and MCAST_UNBLOCK_SOURCE

remove a source address from the list

of sources being blocked. The group must already be joined, and must be in "exclude" mode. The

imr_interface ﬁeld holds the IPv4 address of a local interface, or

INADDR_ANY. The

gsr_interface ﬁeld holds the interface index of a local interface, or zero. If the interface address is

INADDR_ANY, or if the interface index is zero, the system chooses a multicast group by matching the

multicast address only. For example:

struct ip_mreq_source imr;

imr.imr_multiaddr.s_addr = inet_addr("224.1.2.3");

imr.imr_sourceaddr.s_addr = inet_addr("10.4.5.6");

imr.imr_interface.s_addr = INADDR_ANY;

setsockopt(s, IPPROTO_IP, IP_BLOCK_SOURCE, &imr, sizeof(imr));

setsockopt(s, IPPROTO_IP, IP_UNBLOCK_SOURCE, &imr, sizeof(imr));

struct group_source_req gsr;

struct sockaddr_in *sin;

sin = (struct sockaddr_in *)&gsr.gsr_group;

bzero(sin, sizeof(*sin));

sin->sin_family = AF_INET;

sin->sin_addr.s_addr = inet_addr("224.1.2.3");

sin = (struct sockaddr_in *)&gsr.gsr_source;

bzero(sin, sizeof(*sin));

sin->sin_family = AF_INET;

sin->sin_addr.s_addr = inet_addr("10.4.5.6");

gsr.gsr_interface = 0;

setsockopt(s, IPPROTO_IP, MCAST_BLOCK_SOURCE, &gsr, sizeof(gsr));

setsockopt(s, IPPROTO_IP, MCAST_UNBLOCK_SOURCE, &gsr, sizeof(gsr));

IP_ADD_SOURCE_MEMBERSHIP and MCAST_JOIN_SOURCE_GROUP

add a source address to the list

of allowed sources for a multicast group in "include" mode, joining the group in "include" mode if not

already joined.

IP_DROP_SOURCE_MEMBERSHIP and MCAST_LEAVE_SOURCE_GROUP

remove a

source address from the list of allowed sources for a multicast group in "include" mode, leaving the group

if the last source is being removed. The

imr_interface ﬁeld holds the IPv4 address of a local inter-

face, or INADDR_ANY. The gsr_interface ﬁeld holds the interface index of a local interface, or zero.

If the interface address is INADDR_ANY or the interface index is zero, the behavior depends on whether

the group is being joined. If the group is being joined, the system joins the speciﬁed group on the inter-

face from which datagrams for that group would be sent, based on the routing conﬁguration; otherwise,

the system chooses a multicast group by matching the multicast address only. For example:

struct ip_mreq_source imr;

imr.imr_multiaddr.s_addr = inet_addr("224.1.2.3");

imr.imr_sourceaddr.s_addr = inet_addr("10.4.5.6");

imr.imr_interface.s_addr = INADDR_ANY;

setsockopt(s, IPPROTO_IP, IP_ADD_SOURCE_MEMBERSHIP, &imr, sizeof(imr));

setsockopt(s, IPPROTO_IP, IP_DROP_SOURCE_MEMBERSHIP, &imr, sizeof(imr));

HP-UX 11i Version 3: September 2010 − 3 − Hewlett-Packard Company 3