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/*
* Copyright (c)2013-2020 ZeroTier, Inc.
*
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file in the project's root directory.
*
* Change Date: 2024-01-01
*
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2.0 of the Apache License.
*/
/****/
/**
* @file
*
* Callback event processing logic
*/
#include "concurrentqueue.h"
#ifdef SDK_JNI
#include <jni.h>
#endif
#include "Node.hpp"
#include "OSUtils.hpp"
#include "Debug.hpp"
#include "Events.hpp"
#include "ZeroTierSockets.h"
#include "NodeService.hpp"
#define NODE_EVENT_TYPE(code) code >= ZTS_EVENT_NODE_UP && code <= ZTS_EVENT_NODE_NORMAL_TERMINATION
#define NETWORK_EVENT_TYPE(code) code >= ZTS_EVENT_NETWORK_NOT_FOUND && code <= ZTS_EVENT_NETWORK_DOWN
#define STACK_EVENT_TYPE(code) code >= ZTS_EVENT_STACK_UP && code <= ZTS_EVENT_STACK_DOWN
#define NETIF_EVENT_TYPE(code) code >= ZTS_EVENT_NETIF_UP && code <= ZTS_EVENT_NETIF_LINK_DOWN
#define PEER_EVENT_TYPE(code) code >= ZTS_EVENT_PEER_DIRECT && code <= ZTS_EVENT_PEER_UNREACHABLE
#define PATH_EVENT_TYPE(code) code >= ZTS_EVENT_PATH_DISCOVERED && code <= ZTS_EVENT_PATH_DEAD
#define ROUTE_EVENT_TYPE(code) code >= ZTS_EVENT_ROUTE_ADDED && code <= ZTS_EVENT_ROUTE_REMOVED
#define ADDR_EVENT_TYPE(code) code >= ZTS_EVENT_ADDR_ADDED_IP4 && code <= ZTS_EVENT_ADDR_REMOVED_IP6
namespace ZeroTier {
extern NodeService *service;
// Global state variable shared between Socket, Control, Event and NodeService logic.
uint8_t _serviceStateFlags;
// Lock to guard access to callback function pointers.
Mutex _callbackLock;
void (*_userEventCallbackFunc)(void *);
moodycamel::ConcurrentQueue<struct ::zts_callback_msg*> _callbackMsgQueue;
void _enqueueEvent(int16_t eventCode, void *arg)
{
struct ::zts_callback_msg *msg = new ::zts_callback_msg();
msg->node = NULL;
msg->network = NULL;
msg->netif = NULL;
msg->route = NULL;
msg->path = NULL;
msg->peer = NULL;
msg->addr = NULL;
msg->eventCode = eventCode;
if (NODE_EVENT_TYPE(eventCode)) {
msg->node = (struct zts_node_details*)arg;
} if (NETWORK_EVENT_TYPE(eventCode)) {
msg->network = (struct zts_network_details*)arg;
} if (NETIF_EVENT_TYPE(eventCode)) {
msg->netif = (struct zts_netif_details*)arg;
} if (ROUTE_EVENT_TYPE(eventCode)) {
msg->route = (struct zts_virtual_network_route*)arg;
} if (PATH_EVENT_TYPE(eventCode)) {
msg->path = (struct zts_physical_path*)arg;
} if (PEER_EVENT_TYPE(eventCode)) {
msg->peer = (struct zts_peer_details*)arg;
} if (ADDR_EVENT_TYPE(eventCode)) {
msg->addr = (struct zts_addr_details*)arg;
}
_callbackMsgQueue.enqueue(msg);
}
void _freeEvent(struct ::zts_callback_msg *msg)
{
if (!msg) {
return;
}
if (msg->node) { delete msg->node; }
if (msg->network) { delete msg->network; }
if (msg->netif) { delete msg->netif; }
if (msg->route) { delete msg->route; }
if (msg->path) { delete msg->path; }
if (msg->peer) { delete msg->peer; }
if (msg->addr) { delete msg->addr; }
}
void _passDequeuedEventToUser(struct ::zts_callback_msg *msg)
{
#ifdef SDK_JNI
if(_userCallbackMethodRef) {
JNIEnv *env;
#if defined(__ANDROID__)
jint rs = jvm->AttachCurrentThread(&env, NULL);
#else
jint rs = jvm->AttachCurrentThread((void **)&env, NULL);
#endif
assert (rs == JNI_OK);
uint64_t arg = 0;
uint64_t id = 0;
if (NODE_EVENT_TYPE(msg->eventCode)) {
id = msg->node ? msg->node->address : 0;
}
if (NETWORK_EVENT_TYPE(msg->eventCode)) {
id = msg->network ? msg->network->nwid : 0;
}
if (PEER_EVENT_TYPE(msg->eventCode)) {
id = msg->peer ? msg->peer->address : 0;
}
env->CallVoidMethod(objRef, _userCallbackMethodRef, id, msg->eventCode);
_freeEvent(msg);
}
#else
if (_userEventCallbackFunc) {
_userEventCallbackFunc(msg);
_freeEvent(msg);
}
#endif
}
bool _isCallbackRegistered()
{
_callbackLock.lock();
bool retval = false;
#ifdef SDK_JNI
retval = (jvm && objRef && _userCallbackMethodRef);
#else
retval = _userEventCallbackFunc;
#endif
_callbackLock.unlock();
return retval;
}
void _clearRegisteredCallback()
{
_callbackLock.lock();
#ifdef SDK_JNI
objRef = NULL;
_userCallbackMethodRef = NULL;
#else
_userEventCallbackFunc = NULL;
#endif
_callbackLock.unlock();
}
int _canPerformServiceOperation()
{
return service
&& service->isRunning()
&& service->getNode()
&& service->getNode()->online()
&& !_getState(ZTS_STATE_FREE_CALLED);
}
#define RESET_FLAGS( ) _serviceStateFlags = 0;
#define SET_FLAGS(f) _serviceStateFlags |= f;
#define CLR_FLAGS(f) _serviceStateFlags &= ~f;
#define GET_FLAGS(f) ((_serviceStateFlags & f) > 0)
void _setState(uint8_t newFlags)
{
if ((newFlags ^ _serviceStateFlags) & ZTS_STATE_NET_SERVICE_RUNNING) {
return; // No effect. Not allowed to set this flag manually
}
SET_FLAGS(newFlags);
if ( GET_FLAGS(ZTS_STATE_NODE_RUNNING)
&& GET_FLAGS(ZTS_STATE_STACK_RUNNING)
&& !(GET_FLAGS(ZTS_STATE_FREE_CALLED)))
{
SET_FLAGS(ZTS_STATE_NET_SERVICE_RUNNING);
}
else {
CLR_FLAGS(ZTS_STATE_NET_SERVICE_RUNNING);
}
}
void _clrState(uint8_t newFlags)
{
if (newFlags & ZTS_STATE_NET_SERVICE_RUNNING) {
return; // No effect. Not allowed to set this flag manually
}
CLR_FLAGS(newFlags);
if ( GET_FLAGS(ZTS_STATE_NODE_RUNNING)
&& GET_FLAGS(ZTS_STATE_STACK_RUNNING)
&& !(GET_FLAGS(ZTS_STATE_FREE_CALLED)))
{
SET_FLAGS(ZTS_STATE_NET_SERVICE_RUNNING);
}
else {
CLR_FLAGS(ZTS_STATE_NET_SERVICE_RUNNING);
}
}
bool _getState(uint8_t testFlags)
{
return testFlags & _serviceStateFlags;
}
#if defined(__WINDOWS__)
DWORD WINAPI _runCallbacks(LPVOID thread_id)
#else
void *_runCallbacks(void *thread_id)
#endif
{
#if defined(__APPLE__)
pthread_setname_np(ZTS_EVENT_CALLBACK_THREAD_NAME);
#endif
while (_getState(ZTS_STATE_CALLBACKS_RUNNING) || _callbackMsgQueue.size_approx() > 0)
{
struct ::zts_callback_msg *msg;
size_t sz = _callbackMsgQueue.size_approx();
for (size_t j = 0; j < sz; j++) {
if (_callbackMsgQueue.try_dequeue(msg)) {
_callbackLock.lock();
_passDequeuedEventToUser(msg);
_callbackLock.unlock();
delete msg;
}
}
zts_delay_ms(ZTS_CALLBACK_PROCESSING_INTERVAL);
}
#if SDK_JNI
JNIEnv *env;
jint rs = jvm->DetachCurrentThread();
pthread_exit(0);
#endif
return NULL;
}
} // namespace ZeroTier
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