;
    }

    if (family =3D=3D PF_INET) {
        struct sockaddr_in sa4;
        struct ip_mreq mreq4;

        memset(&sa4, 0, sizeof(sa4));
        sa4.sin_len =3D sizeof(sa4);
        sa4.sin_family =3D AF_INET;
        sa4.sin_port =3D htons(6790);
        sa4.sin_addr.s_addr =3D htonl(INADDR_ANY);

        if (bind(fd, (struct sockaddr *)&sa4, sizeof(sa4)) < 0) {
            print_errno("bind(AF_INET)");
            close(fd);
            return 1;
        }
        printf("bind(AF_INET 0.0.0.0:6790) ok\n");

        memset(&mreq4, 0, sizeof(mreq4));
        if (inet_pton(AF_INET, group_str, &mreq4.imr_multiaddr) !=3D 1)
            die("inet_pton(AF_INET)");

        mreq4.imr_interface.s_addr =3D htonl(INADDR_ANY);

        printf("attempting IP_ADD_MEMBERSHIP for %s\n", group_str);
        if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq4,
sizeof(mreq4)) < 0) {
            print_errno("IP_ADD_MEMBERSHIP");
            close(fd);
            return 1;
        }

        printf("IP_ADD_MEMBERSHIP ok -> joined IPv4 multicast successfully =
on
PF_INET\n");
    } else {
        struct sockaddr_in6 sa6;
        struct ip_mreq mreq4;

        memset(&sa6, 0, sizeof(sa6));
        sa6.sin6_len =3D sizeof(sa6);
        sa6.sin6_family =3D AF_INET6;
        sa6.sin6_port =3D htons(6790);
        sa6.sin6_addr =3D in6addr_any;

        if (bind(fd, (struct sockaddr *)&sa6, sizeof(sa6)) < 0) {
            print_errno("bind(AF_INET6)");
            close(fd);
            return 1;
        }
        printf("bind(AF_INET6 :::6790) ok\n");

        memset(&mreq4, 0, sizeof(mreq4));
        if (inet_pton(AF_INET, group_str, &mreq4.imr_multiaddr) !=3D 1)
            die("inet_pton(AF_INET)");

        mreq4.imr_interface.s_addr =3D htonl(INADDR_ANY);

        printf("attempting IP_ADD_MEMBERSHIP for %s\n", group_str);
        if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq4,
sizeof(mreq4)) < 0) {
            print_errno("IP_ADD_MEMBERSHIP");
            close(fd);
            return 1;
        }

        printf("IP_ADD_MEMBERSHIP ok -> joined IPv4 multicast successfully =
on
PF_INET6\n");
    }

    close(fd);
    return 0;
}

$ cc -Wall -Wextra -o mcast_repro mcast_repro.c
$ ./mcast_repro 4
mode: family=3DPF_INET
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
bind(AF_INET 0.0.0.0:6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP ok -> joined IPv4 multicast successfully on PF_INET
$ ./mcast_repro 6 0
mode: family=3DPF_INET6 v6only=3D0
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
setsockopt(IPV6_V6ONLY=3D0) ok
bind(AF_INET6 :::6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP failed: Invalid argument (errno=3D22)
$ ./mcast_repro 6 1
mode: family=3DPF_INET6 v6only=3D1
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
setsockopt(IPV6_V6ONLY=3D1) ok
bind(AF_INET6 :::6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP failed: Invalid argument (errno=3D22)
$ ./mcast_repro 6 0
mode: family=3DPF_INET6 v6only=3D0
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
setsockopt(IPV6_V6ONLY=3D0) ok
bind(AF_INET6 :::6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP failed: Invalid argument (errno=3D22)

Same program on HP-UX 11.31:
osipovmi@deblndw028v:~
$ ./mcast_repro 4
mode: family=3DPF_INET
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
bind(AF_INET 0.0.0.0:6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP ok -> joined IPv4 multicast successfully on PF_INET
osipovmi@deblndw028v:~
$ ./mcast_repro 6
mode: family=3DPF_INET6 v6only=3D1
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
setsockopt(IPV6_V6ONLY=3D1) ok
bind(AF_INET6 :::6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP failed: Operation not supported (errno=3D223)
osipovmi@deblndw028v:~
$ ./mcast_repro 6 0
mode: family=3DPF_INET6 v6only=3D0
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
setsockopt(IPV6_V6ONLY=3D0) ok
bind(AF_INET6 :::6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP failed: Operation not supported (errno=3D223)
osipovmi@deblndw028v:~
$ ./mcast_repro 6 1
mode: family=3DPF_INET6 v6only=3D1
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
setsockopt(IPV6_V6ONLY=3D1) ok
bind(AF_INET6 :::6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP failed: Operation not supported (errno=3D223)

and RHEL 8.x:
osipovmi@deblndw012x:~
$ ./mcast_repro 4
mode: family=3DPF_INET
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
bind(AF_INET 0.0.0.0:6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP ok -> joined IPv4 multicast successfully on PF_INET

osipovmi@deblndw012x:~
$ ./mcast_repro 6
mode: family=3DPF_INET6 v6only=3D1
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
setsockopt(IPV6_V6ONLY=3D1) ok
bind(AF_INET6 :::6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP ok -> joined IPv4 multicast successfully on PF_INET6

osipovmi@deblndw012x:~
$ ./mcast_repro 6 0
mode: family=3DPF_INET6 v6only=3D0
socket() ok -> fd=3D3
setsockopt(SO_REUSEADDR) ok
setsockopt(SO_REUSEPORT) ok
setsockopt(SO_BROADCAST) ok
setsockopt(IPV6_V6ONLY=3D0) ok
bind(AF_INET6 :::6790) ok
attempting IP_ADD_MEMBERSHIP for 228.5.6.7
IP_ADD_MEMBERSHIP ok -> joined IPv4 multicast successfully on PF_INET6


I am not an expert, let me know whether my approach is wrong and where to go
from here.

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