[avahi] compound hostname causes avahi core failure

[Troyanker, Vlad]

We build avahi 0.6.31. When I changed my hostname from <hostname> to
<hostname>.<blah>.<domain>.com as mandated by our company IT, avahi core
fails to initialize with 'Invalid host name' error. I tracked it down to
function avahi_is_valid_host_name() in domain.c
The very last condition returns 0 as 't' is pointing to <blah>. I wonder
what is the purpose of that conditional and  why cannot avahi handle
compound hostname?


Int avahi_is_valid_host_name(const char *t) {
    char label[AVAHI_LABEL_MAX];
    assert(t);

    if (strlen(t) >= AVAHI_DOMAIN_NAME_MAX || !*t)
        return 0;

    if (!(avahi_unescape_label(&t, label, sizeof(label))))
        return 0;

    if (strlen(label) < 1)
        return 0;

    if (*t)
        return 0;

    return 1;
}