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# File 'ext/vmnet/vmnet.c', line 56
static VALUE
vmnet_get_mac_address_from_uuid(VALUE self, VALUE guest_uuid_str_ruby) {
/*
* from vmn_create() in https://github.com/mist64/xhyve/blob/master/src/pci_virtio_vmnet.c
*/
char* guest_uuid_str;
xpc_object_t interface_desc;
uuid_t uuid;
__block interface_ref iface;
__block vmnet_return_t iface_status;
__block char* mac = malloc(18);
dispatch_semaphore_t iface_created, iface_stopped;
dispatch_queue_t if_create_q, if_stop_q;
uint32_t uuid_status;
guest_uuid_str = RSTRING_PTR(guest_uuid_str_ruby);
interface_desc = xpc_dictionary_create(NULL, NULL, 0);
xpc_dictionary_set_uint64(interface_desc, vmnet_operation_mode_key, VMNET_SHARED_MODE);
uuid_from_string(guest_uuid_str, &uuid, &uuid_status);
if (uuid_status != uuid_s_ok) {
fprintf(stderr, "Invalid UUID %s\n", guest_uuid_str);
return rb_str_new2("");
}
xpc_dictionary_set_uuid(interface_desc, vmnet_interface_id_key, uuid);
iface = NULL;
iface_status = 0;
if_create_q = dispatch_queue_create("org.xhyve.vmnet.create", DISPATCH_QUEUE_SERIAL);
iface_created = dispatch_semaphore_create(0);
iface = vmnet_start_interface(interface_desc, if_create_q,
^(vmnet_return_t status, xpc_object_t interface_param)
{
iface_status = status;
if (status != VMNET_SUCCESS || !interface_param) {
dispatch_semaphore_signal(iface_created);
return;
}
//printf("%s\n", xpc_dictionary_get_string(interface_param, vmnet_mac_address_key));
const char *macStr = xpc_dictionary_get_string(interface_param, vmnet_mac_address_key);
strcpy(mac, macStr);
dispatch_semaphore_signal(iface_created);
});
dispatch_semaphore_wait(iface_created, DISPATCH_TIME_FOREVER);
dispatch_release(if_create_q);
if (iface == NULL || iface_status != VMNET_SUCCESS) {
fprintf(stderr, "virtio_net: Could not create vmnet interface, "
"permission denied or no entitlement?\n");
return rb_str_new2("");
}
iface_status = 0;
if_stop_q = dispatch_queue_create("org.xhyve.vmnet.stop", DISPATCH_QUEUE_SERIAL);
iface_stopped = dispatch_semaphore_create(0);
iface_status = vmnet_stop_interface(iface, if_stop_q,
^(vmnet_return_t status)
{
iface_status = status;
dispatch_semaphore_signal(iface_stopped);
});
dispatch_semaphore_wait(iface_stopped, DISPATCH_TIME_FOREVER);
dispatch_release(if_stop_q);
if (iface_status != VMNET_SUCCESS) {
fprintf(stderr, "virtio_net: Could not stop vmnet interface, "
"permission denied or no entitlement?\n");
return rb_str_new2("");
}
return rb_str_new2(mac);
}
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