/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
/*
* This defines the external C API for ZeroTier's core network virtualization
* engine.
*/
#ifndef ZT_ZEROTIERONE_H
#define ZT_ZEROTIERONE_H
#include
// For the struct sockaddr_storage structure
#if defined(_WIN32) || defined(_WIN64)
#include
#include
#include
#else /* not Windows */
#include
#include
#include
#include
#endif /* Windows or not */
#ifdef __cplusplus
extern "C" {
#endif
/****************************************************************************/
/* Core constants */
/****************************************************************************/
/**
* Default UDP port for devices running a ZeroTier endpoint
*/
#define ZT_DEFAULT_PORT 9993
/**
* Maximum MTU for ZeroTier virtual networks
*
* This is pretty much an unchangeable global constant. To make it change
* across nodes would require logic to send ICMP packet too big messages,
* which would complicate things. 1500 has been good enough on most LANs
* for ages, so a larger MTU should be fine for the forseeable future. This
* typically results in two UDP packets per single large frame. Experimental
* results seem to show that this is good. Larger MTUs resulting in more
* fragments seemed too brittle on slow/crummy links for no benefit.
*
* If this does change, also change it in tap.h in the tuntaposx code under
* mac-tap.
*
* Overhead for a normal frame split into two packets:
*
* 1414 = 1444 (typical UDP MTU) - 28 (packet header) - 2 (ethertype)
* 1428 = 1444 (typical UDP MTU) - 16 (fragment header)
* SUM: 2842
*
* We use 2800, which leaves some room for other payload in other types of
* messages such as multicast propagation or future support for bridging.
*/
#define ZT_MAX_MTU 2800
/**
* Maximum length of network short name
*/
#define ZT_MAX_NETWORK_SHORT_NAME_LENGTH 127
/**
* Maximum number of pushed routes on a network
*/
#define ZT_MAX_NETWORK_ROUTES 32
/**
* Maximum number of statically assigned IP addresses per network endpoint using ZT address management (not DHCP)
*/
#define ZT_MAX_ZT_ASSIGNED_ADDRESSES 16
/**
* Maximum number of "specialists" on a network -- bridges, relays, etc.
*/
#define ZT_MAX_NETWORK_SPECIALISTS 256
/**
* Maximum number of static physical to ZeroTier address mappings (typically relays, etc.)
*/
#define ZT_MAX_NETWORK_STATIC_PHYSICAL_ADDRESSES 16
/**
* Maximum number of rule table entries per network (can be increased)
*/
#define ZT_MAX_NETWORK_RULES 256
/**
* Maximum number of multicast group subscriptions per network
*/
#define ZT_MAX_NETWORK_MULTICAST_SUBSCRIPTIONS 4096
/**
* Maximum number of direct network paths to a given peer
*/
#define ZT_MAX_PEER_NETWORK_PATHS 4
/**
* Maximum number of hops in a ZeroTier circuit test
*
* This is more or less the max that can be fit in a given packet (with
* fragmentation) and only one address per hop.
*/
#define ZT_CIRCUIT_TEST_MAX_HOPS 256
/**
* Maximum number of addresses per hop in a circuit test
*/
#define ZT_CIRCUIT_TEST_MAX_HOP_BREADTH 8
/**
* Maximum number of cluster members (and max member ID plus one)
*/
#define ZT_CLUSTER_MAX_MEMBERS 128
/**
* Maximum number of physical ZeroTier addresses a cluster member can report
*/
#define ZT_CLUSTER_MAX_ZT_PHYSICAL_ADDRESSES 16
/**
* Maximum allowed cluster message length in bytes
*/
#define ZT_CLUSTER_MAX_MESSAGE_LENGTH (1500 - 48)
/**
* A null/empty sockaddr (all zero) to signify an unspecified socket address
*/
extern const struct sockaddr_storage ZT_SOCKADDR_NULL;
/****************************************************************************/
/* Structures and other types */
/****************************************************************************/
/**
* Function return code: OK (0) or error results
*
* Use ZT_ResultCode_isFatal() to check for a fatal error. If a fatal error
* occurs, the node should be considered to not be working correctly. These
* indicate serious problems like an inaccessible data store or a compile
* problem.
*/
enum ZT_ResultCode
{
/**
* Operation completed normally
*/
ZT_RESULT_OK = 0,
// Fatal errors (>0, <1000)
/**
* Ran out of memory
*/
ZT_RESULT_FATAL_ERROR_OUT_OF_MEMORY = 1,
/**
* Data store is not writable or has failed
*/
ZT_RESULT_FATAL_ERROR_DATA_STORE_FAILED = 2,
/**
* Internal error (e.g. unexpected exception indicating bug or build problem)
*/
ZT_RESULT_FATAL_ERROR_INTERNAL = 3,
// Non-fatal errors (>1000)
/**
* Network ID not valid
*/
ZT_RESULT_ERROR_NETWORK_NOT_FOUND = 1000,
/**
* The requested operation is not supported on this version or build
*/
ZT_RESULT_ERROR_UNSUPPORTED_OPERATION = 1001,
/**
* The requestion operation was given a bad parameter or was called in an invalid state
*/
ZT_RESULT_ERROR_BAD_PARAMETER = 1002
};
/**
* @param x Result code
* @return True if result code indicates a fatal error
*/
#define ZT_ResultCode_isFatal(x) ((((int)(x)) > 0)&&(((int)(x)) < 1000))
/**
* Status codes sent to status update callback when things happen
*/
enum ZT_Event
{
/**
* Node has been initialized
*
* This is the first event generated, and is always sent. It may occur
* before Node's constructor returns.
*
* Meta-data: none
*/
ZT_EVENT_UP = 0,
/**
* Node is offline -- network does not seem to be reachable by any available strategy
*
* Meta-data: none
*/
ZT_EVENT_OFFLINE = 1,
/**
* Node is online -- at least one upstream node appears reachable
*
* Meta-data: none
*/
ZT_EVENT_ONLINE = 2,
/**
* Node is shutting down
*
* This is generated within Node's destructor when it is being shut down.
* It's done for convenience, since cleaning up other state in the event
* handler may appear more idiomatic.
*
* Meta-data: none
*/
ZT_EVENT_DOWN = 3,
/**
* Your identity has collided with another node's ZeroTier address
*
* This happens if two different public keys both hash (via the algorithm
* in Identity::generate()) to the same 40-bit ZeroTier address.
*
* This is something you should "never" see, where "never" is defined as
* once per 2^39 new node initializations / identity creations. If you do
* see it, you're going to see it very soon after a node is first
* initialized.
*
* This is reported as an event rather than a return code since it's
* detected asynchronously via error messages from authoritative nodes.
*
* If this occurs, you must shut down and delete the node, delete the
* identity.secret record/file from the data store, and restart to generate
* a new identity. If you don't do this, you will not be able to communicate
* with other nodes.
*
* We'd automate this process, but we don't think silently deleting
* private keys or changing our address without telling the calling code
* is good form. It violates the principle of least surprise.
*
* You can technically get away with not handling this, but we recommend
* doing so in a mature reliable application. Besides, handling this
* condition is a good way to make sure it never arises. It's like how
* umbrellas prevent rain and smoke detectors prevent fires. They do, right?
*
* Meta-data: none
*/
ZT_EVENT_FATAL_ERROR_IDENTITY_COLLISION = 4,
/**
* Trace (debugging) message
*
* These events are only generated if this is a TRACE-enabled build.
*
* Meta-data: C string, TRACE message
*/
ZT_EVENT_TRACE = 5
};
/**
* Current node status
*/
typedef struct
{
/**
* 40-bit ZeroTier address of this node
*/
uint64_t address;
/**
* Current world ID
*/
uint64_t worldId;
/**
* Current world revision/timestamp
*/
uint64_t worldTimestamp;
/**
* Public identity in string-serialized form (safe to send to others)
*
* This pointer will remain valid as long as the node exists.
*/
const char *publicIdentity;
/**
* Full identity including secret key in string-serialized form
*
* This pointer will remain valid as long as the node exists.
*/
const char *secretIdentity;
/**
* True if some kind of connectivity appears available
*/
int online;
} ZT_NodeStatus;
/**
* Virtual network status codes
*/
enum ZT_VirtualNetworkStatus
{
/**
* Waiting for network configuration (also means revision == 0)
*/
ZT_NETWORK_STATUS_REQUESTING_CONFIGURATION = 0,
/**
* Configuration received and we are authorized
*/
ZT_NETWORK_STATUS_OK = 1,
/**
* Netconf master told us 'nope'
*/
ZT_NETWORK_STATUS_ACCESS_DENIED = 2,
/**
* Netconf master exists, but this virtual network does not
*/
ZT_NETWORK_STATUS_NOT_FOUND = 3,
/**
* Initialization of network failed or other internal error
*/
ZT_NETWORK_STATUS_PORT_ERROR = 4,
/**
* ZeroTier One version too old
*/
ZT_NETWORK_STATUS_CLIENT_TOO_OLD = 5
};
/**
* Virtual network type codes
*/
enum ZT_VirtualNetworkType
{
/**
* Private networks are authorized via certificates of membership
*/
ZT_NETWORK_TYPE_PRIVATE = 0,
/**
* Public networks have no access control -- they'll always be AUTHORIZED
*/
ZT_NETWORK_TYPE_PUBLIC = 1
};
/**
* The type of a virtual network rules table entry
*
* These must range from 0 to 127 (0x7f).
*
* Each rule is composed of one or more MATCHes followed by an ACTION.
*/
enum ZT_VirtualNetworkRuleType
{
/**
* Drop frame
*/
ZT_NETWORK_RULE_ACTION_DROP = 0,
/**
* Accept and pass frame
*/
ZT_NETWORK_RULE_ACTION_ACCEPT = 1,
/**
* Forward a copy of this frame to an observer
*/
ZT_NETWORK_RULE_ACTION_TEE = 2,
/**
* Explicitly redirect this frame to another device (ignored if this is the target device)
*/
ZT_NETWORK_RULE_ACTION_REDIRECT = 3,
/**
* Source ZeroTier address -- analogous to an Ethernet port ID on a switch
*/
ZT_NETWORK_RULE_MATCH_SOURCE_ZEROTIER_ADDRESS = 32,
/**
* Destination ZeroTier address -- analogous to an Ethernet port ID on a switch
*/
ZT_NETWORK_RULE_MATCH_DEST_ZEROTIER_ADDRESS = 33,
/**
* Ethernet VLAN ID
*/
ZT_NETWORK_RULE_MATCH_VLAN_ID = 34,
/**
* Ethernet VLAN PCP
*/
ZT_NETWORK_RULE_MATCH_VLAN_PCP = 35,
/**
* Ethernet VLAN DEI
*/
ZT_NETWORK_RULE_MATCH_VLAN_DEI = 36,
/**
* Ethernet frame type
*/
ZT_NETWORK_RULE_MATCH_ETHERTYPE = 37,
/**
* Source Ethernet MAC address
*/
ZT_NETWORK_RULE_MATCH_MAC_SOURCE = 38,
/**
* Destination Ethernet MAC address
*/
ZT_NETWORK_RULE_MATCH_MAC_DEST = 39,
/**
* Source IPv4 address
*/
ZT_NETWORK_RULE_MATCH_IPV4_SOURCE = 40,
/**
* Destination IPv4 address
*/
ZT_NETWORK_RULE_MATCH_IPV4_DEST = 41,
/**
* Source IPv6 address
*/
ZT_NETWORK_RULE_MATCH_IPV6_SOURCE = 42,
/**
* Destination IPv6 address
*/
ZT_NETWORK_RULE_MATCH_IPV6_DEST = 43,
/**
* IP TOS (type of service)
*/
ZT_NETWORK_RULE_MATCH_IP_TOS = 44,
/**
* IP protocol
*/
ZT_NETWORK_RULE_MATCH_IP_PROTOCOL = 45,
/**
* IP source port range (start-end, inclusive)
*/
ZT_NETWORK_RULE_MATCH_IP_SOURCE_PORT_RANGE = 46,
/**
* IP destination port range (start-end, inclusive)
*/
ZT_NETWORK_RULE_MATCH_IP_DEST_PORT_RANGE = 47,
/**
* Packet characteristics (set of flags)
*/
ZT_NETWORK_RULE_MATCH_CHARACTERISTICS = 48,
/**
* Frame size range (start-end, inclusive)
*/
ZT_NETWORK_RULE_MATCH_FRAME_SIZE_RANGE = 49
};
/**
* Network flow rule
*
* NOTE: Currently (1.1.x) only etherType is supported! Other things will
* have no effect until the rules engine is fully implemented.
*
* Rules are stored in a table in which one or more match entries is followed
* by an action. If more than one match precedes an action, the rule is
* the AND of all matches. An action with no match is always taken since it
* matches anything. If nothing matches, the default action is DROP.
*
* This is designed to be a more memory-efficient way of storing rules than
* a wide table, yet still fast and simple to access in code.
*/
typedef struct
{
/**
* Least significant 7 bits: ZT_VirtualNetworkRuleType, most significant 1 bit is NOT bit
*
* If the NOT bit is set, then matches will be interpreted as "does not
* match." The NOT bit has no effect on actions.
*
* Use "& 0x7f" to get the enum and "& 0x80" to get the NOT flag.
*
* The union 'v' is a variant type, and this selects which field in 'v' is
* actually used and valid.
*/
uint8_t t;
/**
* Union containing the value of this rule -- which field is used depends on 't'
*/
union {
/**
* IPv6 address in big-endian / network byte order and netmask bits
*/
struct {
uint8_t ip[16];
uint8_t mask;
} ipv6;
/**
* IPv4 address in big-endian / network byte order
*/
struct {
uint32_t ip;
uint8_t mask;
} ipv4;
/**
* Packet characteristic flags being matched
*/
uint64_t characteristics;
/**
* IP port range -- start-end inclusive -- host byte order
*/
uint16_t port[2];
/**
* 40-bit ZeroTier address (in least significant bits, host byte order)
*/
uint64_t zt;
/**
* 48-bit Ethernet MAC address in big-endian order
*/
uint8_t mac[6];
/**
* VLAN ID in host byte order
*/
uint16_t vlanId;
/**
* VLAN PCP (least significant 3 bits)
*/
uint8_t vlanPcp;
/**
* VLAN DEI (single bit / boolean)
*/
uint8_t vlanDei;
/**
* Ethernet type in host byte order
*/
uint16_t etherType;
/**
* IP protocol
*/
uint8_t ipProtocol;
/**
* IP type of service
*/
uint8_t ipTos;
/**
* Ethernet packet size in host byte order (start-end, inclusive)
*/
uint16_t frameSize[2];
} v;
} ZT_VirtualNetworkRule;
/**
* A route to be pushed on a virtual network
*/
typedef struct
{
/**
* Target network / netmask bits (in port field) or NULL or 0.0.0.0/0 for default
*/
struct sockaddr_storage target;
/**
* Gateway IP address (port ignored) or NULL (family == 0) for LAN-local (no gateway)
*/
struct sockaddr_storage via;
} ZT_VirtualNetworkRoute;
/**
* An Ethernet multicast group
*/
typedef struct
{
/**
* MAC address (least significant 48 bits)
*/
uint64_t mac;
/**
* Additional distinguishing information (usually zero)
*/
unsigned long adi;
} ZT_MulticastGroup;
/**
* Virtual network configuration update type
*/
enum ZT_VirtualNetworkConfigOperation
{
/**
* Network is coming up (either for the first time or after service restart)
*/
ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_UP = 1,
/**
* Network configuration has been updated
*/
ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_CONFIG_UPDATE = 2,
/**
* Network is going down (not permanently)
*/
ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_DOWN = 3,
/**
* Network is going down permanently (leave/delete)
*/
ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_DESTROY = 4
};
/**
* What trust hierarchy role does this peer have?
*/
enum ZT_PeerRole {
ZT_PEER_ROLE_LEAF = 0, // ordinary node
ZT_PEER_ROLE_RELAY = 1, // relay node
ZT_PEER_ROLE_ROOT = 2 // root server
};
/**
* Vendor ID
*/
enum ZT_Vendor {
ZT_VENDOR_UNSPECIFIED = 0,
ZT_VENDOR_ZEROTIER = 1
};
/**
* Platform type
*/
enum ZT_Platform {
ZT_PLATFORM_UNSPECIFIED = 0,
ZT_PLATFORM_LINUX = 1,
ZT_PLATFORM_WINDOWS = 2,
ZT_PLATFORM_MACOS = 3,
ZT_PLATFORM_ANDROID = 4,
ZT_PLATFORM_IOS = 5,
ZT_PLATFORM_SOLARIS_SMARTOS = 6,
ZT_PLATFORM_FREEBSD = 7,
ZT_PLATFORM_NETBSD = 8,
ZT_PLATFORM_OPENBSD = 9,
ZT_PLATFORM_RISCOS = 10,
ZT_PLATFORM_VXWORKS = 11,
ZT_PLATFORM_FREERTOS = 12,
ZT_PLATFORM_SYSBIOS = 13,
ZT_PLATFORM_HURD = 14
};
/**
* Architecture type
*/
enum ZT_Architecture {
ZT_ARCHITECTURE_UNSPECIFIED = 0,
ZT_ARCHITECTURE_X86 = 1,
ZT_ARCHITECTURE_X64 = 2,
ZT_ARCHITECTURE_ARM32 = 3,
ZT_ARCHITECTURE_ARM64 = 4,
ZT_ARCHITECTURE_MIPS32 = 5,
ZT_ARCHITECTURE_MIPS64 = 6,
ZT_ARCHITECTURE_POWER32 = 7,
ZT_ARCHITECTURE_POWER64 = 8
};
/**
* Virtual network configuration
*/
typedef struct
{
/**
* 64-bit ZeroTier network ID
*/
uint64_t nwid;
/**
* Ethernet MAC (48 bits) that should be assigned to port
*/
uint64_t mac;
/**
* Network name (from network configuration master)
*/
char name[ZT_MAX_NETWORK_SHORT_NAME_LENGTH + 1];
/**
* Network configuration request status
*/
enum ZT_VirtualNetworkStatus status;
/**
* Network type
*/
enum ZT_VirtualNetworkType type;
/**
* Maximum interface MTU
*/
unsigned int mtu;
/**
* If nonzero, the network this port belongs to indicates DHCP availability
*
* This is a suggestion. The underlying implementation is free to ignore it
* for security or other reasons. This is simply a netconf parameter that
* means 'DHCP is available on this network.'
*/
int dhcp;
/**
* If nonzero, this port is allowed to bridge to other networks
*
* This is informational. If this is false (0), bridged packets will simply
* be dropped and bridging won't work.
*/
int bridge;
/**
* If nonzero, this network supports and allows broadcast (ff:ff:ff:ff:ff:ff) traffic
*/
int broadcastEnabled;
/**
* If the network is in PORT_ERROR state, this is the error most recently returned by the port config callback
*/
int portError;
/**
* Is this network enabled? If not, all frames to/from are dropped.
*/
int enabled;
/**
* Network config revision as reported by netconf master
*
* If this is zero, it means we're still waiting for our netconf.
*/
unsigned long netconfRevision;
/**
* Number of multicast group subscriptions
*/
unsigned int multicastSubscriptionCount;
/**
* Multicast group subscriptions
*/
ZT_MulticastGroup multicastSubscriptions[ZT_MAX_NETWORK_MULTICAST_SUBSCRIPTIONS];
/**
* Number of assigned addresses
*/
unsigned int assignedAddressCount;
/**
* ZeroTier-assigned addresses (in sockaddr_storage structures)
*
* For IP, the port number of the sockaddr_XX structure contains the number
* of bits in the address netmask. Only the IP address and port are used.
* Other fields like interface number can be ignored.
*
* This is only used for ZeroTier-managed address assignments sent by the
* virtual network's configuration master.
*/
struct sockaddr_storage assignedAddresses[ZT_MAX_ZT_ASSIGNED_ADDRESSES];
} ZT_VirtualNetworkConfig;
/**
* A list of networks
*/
typedef struct
{
ZT_VirtualNetworkConfig *networks;
unsigned long networkCount;
} ZT_VirtualNetworkList;
/**
* Physical network path to a peer
*/
typedef struct
{
/**
* Address of endpoint
*/
struct sockaddr_storage address;
/**
* Time of last send in milliseconds or 0 for never
*/
uint64_t lastSend;
/**
* Time of last receive in milliseconds or 0 for never
*/
uint64_t lastReceive;
/**
* Is path active?
*/
int active;
/**
* Is path preferred?
*/
int preferred;
} ZT_PeerPhysicalPath;
/**
* Peer status result buffer
*/
typedef struct
{
/**
* ZeroTier address (40 bits)
*/
uint64_t address;
/**
* Time we last received a unicast frame from this peer
*/
uint64_t lastUnicastFrame;
/**
* Time we last received a multicast rame from this peer
*/
uint64_t lastMulticastFrame;
/**
* Remote major version or -1 if not known
*/
int versionMajor;
/**
* Remote minor version or -1 if not known
*/
int versionMinor;
/**
* Remote revision or -1 if not known
*/
int versionRev;
/**
* Last measured latency in milliseconds or zero if unknown
*/
unsigned int latency;
/**
* What trust hierarchy role does this device have?
*/
enum ZT_PeerRole role;
/**
* Number of paths (size of paths[])
*/
unsigned int pathCount;
/**
* Known network paths to peer
*/
ZT_PeerPhysicalPath paths[ZT_MAX_PEER_NETWORK_PATHS];
} ZT_Peer;
/**
* List of peers
*/
typedef struct
{
ZT_Peer *peers;
unsigned long peerCount;
} ZT_PeerList;
/**
* ZeroTier circuit test configuration and path
*/
typedef struct {
/**
* Test ID -- an arbitrary 64-bit identifier
*/
uint64_t testId;
/**
* Timestamp -- sent with test and echoed back by each reporter
*/
uint64_t timestamp;
/**
* Originator credential: network ID
*
* If this is nonzero, a network ID will be set for this test and
* the originator must be its primary network controller. This is
* currently the only authorization method available, so it must
* be set to run a test.
*/
uint64_t credentialNetworkId;
/**
* Hops in circuit test (a.k.a. FIFO for graph traversal)
*/
struct {
/**
* Hop flags (currently unused, must be zero)
*/
unsigned int flags;
/**
* Number of addresses in this hop (max: ZT_CIRCUIT_TEST_MAX_HOP_BREADTH)
*/
unsigned int breadth;
/**
* 40-bit ZeroTier addresses (most significant 24 bits ignored)
*/
uint64_t addresses[ZT_CIRCUIT_TEST_MAX_HOP_BREADTH];
} hops[ZT_CIRCUIT_TEST_MAX_HOPS];
/**
* Number of hops (max: ZT_CIRCUIT_TEST_MAX_HOPS)
*/
unsigned int hopCount;
/**
* If non-zero, circuit test will report back at every hop
*/
int reportAtEveryHop;
/**
* An arbitrary user-settable pointer
*/
void *ptr;
/**
* Pointer for internal use -- initialize to zero and do not modify
*/
void *_internalPtr;
} ZT_CircuitTest;
/**
* Circuit test result report
*/
typedef struct {
/**
* Sender of report (current hop)
*/
uint64_t current;
/**
* Previous hop
*/
uint64_t upstream;
/**
* 64-bit test ID
*/
uint64_t testId;
/**
* Timestamp from original test (echoed back at each hop)
*/
uint64_t timestamp;
/**
* Timestamp on remote device
*/
uint64_t remoteTimestamp;
/**
* 64-bit packet ID of packet received by the reporting device
*/
uint64_t sourcePacketId;
/**
* Flags (currently unused, will be zero)
*/
uint64_t flags;
/**
* ZeroTier protocol-level hop count of packet received by reporting device (>0 indicates relayed)
*/
unsigned int sourcePacketHopCount;
/**
* Error code (currently unused, will be zero)
*/
unsigned int errorCode;
/**
* Remote device vendor ID
*/
enum ZT_Vendor vendor;
/**
* Remote device protocol compliance version
*/
unsigned int protocolVersion;
/**
* Software major version
*/
unsigned int majorVersion;
/**
* Software minor version
*/
unsigned int minorVersion;
/**
* Software revision
*/
unsigned int revision;
/**
* Platform / OS
*/
enum ZT_Platform platform;
/**
* System architecture
*/
enum ZT_Architecture architecture;
/**
* Local device address on which packet was received by reporting device
*
* This may have ss_family equal to zero (null address) if unspecified.
*/
struct sockaddr_storage receivedOnLocalAddress;
/**
* Remote address from which reporter received the test packet
*
* This may have ss_family set to zero (null address) if unspecified.
*/
struct sockaddr_storage receivedFromRemoteAddress;
/**
* Next hops to which packets are being or will be sent by the reporter
*
* In addition to reporting back, the reporter may send the test on if
* there are more recipients in the FIFO. If it does this, it can report
* back the address(es) that make up the next hop and the physical address
* for each if it has one. The physical address being null/unspecified
* typically indicates that no direct path exists and the next packet
* will be relayed.
*/
struct {
/**
* 40-bit ZeroTier address
*/
uint64_t address;
/**
* Physical address or null address (ss_family == 0) if unspecified or unknown
*/
struct sockaddr_storage physicalAddress;
} nextHops[ZT_CIRCUIT_TEST_MAX_HOP_BREADTH];
/**
* Number of next hops reported in nextHops[]
*/
unsigned int nextHopCount;
} ZT_CircuitTestReport;
/**
* A cluster member's status
*/
typedef struct {
/**
* This cluster member's ID (from 0 to 1-ZT_CLUSTER_MAX_MEMBERS)
*/
unsigned int id;
/**
* Number of milliseconds since last 'alive' heartbeat message received via cluster backplane address
*/
unsigned int msSinceLastHeartbeat;
/**
* Non-zero if cluster member is alive
*/
int alive;
/**
* X, Y, and Z coordinates of this member (if specified, otherwise zero)
*
* What these mean depends on the location scheme being used for
* location-aware clustering. At present this is GeoIP and these
* will be the X, Y, and Z coordinates of the location on a spherical
* approximation of Earth where Earth's core is the origin (in km).
* They don't have to be perfect and need only be comparable with others
* to find shortest path via the standard vector distance formula.
*/
int x,y,z;
/**
* Cluster member's last reported load
*/
uint64_t load;
/**
* Number of peers
*/
uint64_t peers;
/**
* Physical ZeroTier endpoints for this member (where peers are sent when directed here)
*/
struct sockaddr_storage zeroTierPhysicalEndpoints[ZT_CLUSTER_MAX_ZT_PHYSICAL_ADDRESSES];
/**
* Number of physical ZeroTier endpoints this member is announcing
*/
unsigned int numZeroTierPhysicalEndpoints;
} ZT_ClusterMemberStatus;
/**
* ZeroTier cluster status
*/
typedef struct {
/**
* My cluster member ID (a record for 'self' is included in member[])
*/
unsigned int myId;
/**
* Number of cluster members
*/
unsigned int clusterSize;
/**
* Cluster member statuses
*/
ZT_ClusterMemberStatus members[ZT_CLUSTER_MAX_MEMBERS];
} ZT_ClusterStatus;
/**
* An instance of a ZeroTier One node (opaque)
*/
typedef void ZT_Node;
/****************************************************************************/
/* Callbacks used by Node API */
/****************************************************************************/
/**
* Callback called to update virtual network port configuration
*
* This can be called at any time to update the configuration of a virtual
* network port. The parameter after the network ID specifies whether this
* port is being brought up, updated, brought down, or permanently deleted.
*
* This in turn should be used by the underlying implementation to create
* and configure tap devices at the OS (or virtual network stack) layer.
*
* The supplied config pointer is not guaranteed to remain valid, so make
* a copy if you want one.
*
* This should not call multicastSubscribe() or other network-modifying
* methods, as this could cause a deadlock in multithreaded or interrupt
* driven environments.
*
* This must return 0 on success. It can return any OS-dependent error code
* on failure, and this results in the network being placed into the
* PORT_ERROR state.
*/
typedef int (*ZT_VirtualNetworkConfigFunction)(
ZT_Node *, /* Node */
void *, /* User ptr */
uint64_t, /* Network ID */
void **, /* Modifiable network user PTR */
enum ZT_VirtualNetworkConfigOperation, /* Config operation */
const ZT_VirtualNetworkConfig *); /* Network configuration */
/**
* Function to send a frame out to a virtual network port
*
* Parameters: (1) node, (2) user ptr, (3) network ID, (4) source MAC,
* (5) destination MAC, (6) ethertype, (7) VLAN ID, (8) frame data,
* (9) frame length.
*/
typedef void (*ZT_VirtualNetworkFrameFunction)(
ZT_Node *, /* Node */
void *, /* User ptr */
uint64_t, /* Network ID */
void **, /* Modifiable network user PTR */
uint64_t, /* Source MAC */
uint64_t, /* Destination MAC */
unsigned int, /* Ethernet type */
unsigned int, /* VLAN ID (0 for none) */
const void *, /* Frame data */
unsigned int); /* Frame length */
/**
* Callback for events
*
* Events are generated when the node's status changes in a significant way
* and on certain non-fatal errors and events of interest. The final void
* parameter points to event meta-data. The type of event meta-data (and
* whether it is present at all) is event type dependent. See the comments
* in the definition of ZT_Event.
*/
typedef void (*ZT_EventCallback)(
ZT_Node *,
void *,
enum ZT_Event,
const void *);
/**
* Function to get an object from the data store
*
* Parameters: (1) object name, (2) buffer to fill, (3) size of buffer, (4)
* index in object to start reading, (5) result parameter that must be set
* to the actual size of the object if it exists.
*
* Object names can contain forward slash (/) path separators. They will
* never contain .. or backslash (\), so this is safe to map as a Unix-style
* path if the underlying storage permits. For security reasons we recommend
* returning errors if .. or \ are used.
*
* The function must return the actual number of bytes read. If the object
* doesn't exist, it should return -1. -2 should be returned on other errors
* such as errors accessing underlying storage.
*
* If the read doesn't fit in the buffer, the max number of bytes should be
* read. The caller may call the function multiple times to read the whole
* object.
*/
typedef long (*ZT_DataStoreGetFunction)(
ZT_Node *,
void *,
const char *,
void *,
unsigned long,
unsigned long,
unsigned long *);
/**
* Function to store an object in the data store
*
* Parameters: (1) node, (2) user ptr, (3) object name, (4) object data,
* (5) object size, (6) secure? (bool).
*
* If secure is true, the file should be set readable and writable only
* to the user running ZeroTier One. What this means is platform-specific.
*
* Name semantics are the same as the get function. This must return zero on
* success. You can return any OS-specific error code on failure, as these
* may be visible in logs or error messages and might aid in debugging.
*
* If the data pointer is null, this must be interpreted as a delete
* operation.
*/
typedef int (*ZT_DataStorePutFunction)(
ZT_Node *,
void *,
const char *,
const void *,
unsigned long,
int);
/**
* Function to send a ZeroTier packet out over the wire
*
* Parameters:
* (1) Node
* (2) User pointer
* (3) Local interface address
* (4) Remote address
* (5) Packet data
* (6) Packet length
* (7) Desired IP TTL or 0 to use default
*
* If there is only one local interface it is safe to ignore the local
* interface address. Otherwise if running with multiple interfaces, the
* correct local interface should be chosen by address unless NULL. If
* the ss_family field is zero (NULL address), a random or preferred
* default interface should be used.
*
* If TTL is nonzero, packets should have their IP TTL value set to this
* value if possible. If this is not possible it is acceptable to ignore
* this value and send anyway with normal or default TTL.
*
* The function must return zero on success and may return any error code
* on failure. Note that success does not (of course) guarantee packet
* delivery. It only means that the packet appears to have been sent.
*/
typedef int (*ZT_WirePacketSendFunction)(
ZT_Node *, /* Node */
void *, /* User ptr */
const struct sockaddr_storage *, /* Local address */
const struct sockaddr_storage *, /* Remote address */
const void *, /* Packet data */
unsigned int, /* Packet length */
unsigned int); /* TTL or 0 to use default */
/**
* Function to check whether a path should be used for ZeroTier traffic
*
* Paramters:
* (1) Node
* (2) User pointer
* (3) Local interface address
* (4) Remote address
*
* This function must return nonzero (true) if the path should be used.
*
* If no path check function is specified, ZeroTier will still exclude paths
* that overlap with ZeroTier-assigned and managed IP address blocks. But the
* use of a path check function is recommended to ensure that recursion does
* not occur in cases where addresses are assigned by the OS or managed by
* an out of band mechanism like DHCP. The path check function should examine
* all configured ZeroTier interfaces and check to ensure that the supplied
* addresses will not result in ZeroTier traffic being sent over a ZeroTier
* interface (recursion).
*
* Obviously this is not required in configurations where this can't happen,
* such as network containers or embedded.
*/
typedef int (*ZT_PathCheckFunction)(
ZT_Node *, /* Node */
void *, /* User ptr */
const struct sockaddr_storage *, /* Local address */
const struct sockaddr_storage *); /* Remote address */
/****************************************************************************/
/* C Node API */
/****************************************************************************/
/**
* Create a new ZeroTier One node
*
* Note that this can take a few seconds the first time it's called, as it
* will generate an identity.
*
* @param node Result: pointer is set to new node instance on success
* @param uptr User pointer to pass to functions/callbacks
* @param now Current clock in milliseconds
* @param dataStoreGetFunction Function called to get objects from persistent storage
* @param dataStorePutFunction Function called to put objects in persistent storage
* @param virtualNetworkConfigFunction Function to be called when virtual LANs are created, deleted, or their config parameters change
* @param pathCheckFunction A function to check whether a path should be used for ZeroTier traffic, or NULL to allow any path
* @param eventCallback Function to receive status updates and non-fatal error notices
* @return OK (0) or error code if a fatal error condition has occurred
*/
enum ZT_ResultCode ZT_Node_new(
ZT_Node **node,
void *uptr,
uint64_t now,
ZT_DataStoreGetFunction dataStoreGetFunction,
ZT_DataStorePutFunction dataStorePutFunction,
ZT_WirePacketSendFunction wirePacketSendFunction,
ZT_VirtualNetworkFrameFunction virtualNetworkFrameFunction,
ZT_VirtualNetworkConfigFunction virtualNetworkConfigFunction,
ZT_PathCheckFunction pathCheckFunction,
ZT_EventCallback eventCallback);
/**
* Delete a node and free all resources it consumes
*
* If you are using multiple threads, all other threads must be shut down
* first. This can crash if processXXX() methods are in progress.
*
* @param node Node to delete
*/
void ZT_Node_delete(ZT_Node *node);
/**
* Process a packet received from the physical wire
*
* @param node Node instance
* @param now Current clock in milliseconds
* @param localAddress Local address, or point to ZT_SOCKADDR_NULL if unspecified
* @param remoteAddress Origin of packet
* @param packetData Packet data
* @param packetLength Packet length
* @param nextBackgroundTaskDeadline Value/result: set to deadline for next call to processBackgroundTasks()
* @return OK (0) or error code if a fatal error condition has occurred
*/
enum ZT_ResultCode ZT_Node_processWirePacket(
ZT_Node *node,
uint64_t now,
const struct sockaddr_storage *localAddress,
const struct sockaddr_storage *remoteAddress,
const void *packetData,
unsigned int packetLength,
volatile uint64_t *nextBackgroundTaskDeadline);
/**
* Process a frame from a virtual network port (tap)
*
* @param node Node instance
* @param now Current clock in milliseconds
* @param nwid ZeroTier 64-bit virtual network ID
* @param sourceMac Source MAC address (least significant 48 bits)
* @param destMac Destination MAC address (least significant 48 bits)
* @param etherType 16-bit Ethernet frame type
* @param vlanId 10-bit VLAN ID or 0 if none
* @param frameData Frame payload data
* @param frameLength Frame payload length
* @param nextBackgroundTaskDeadline Value/result: set to deadline for next call to processBackgroundTasks()
* @return OK (0) or error code if a fatal error condition has occurred
*/
enum ZT_ResultCode ZT_Node_processVirtualNetworkFrame(
ZT_Node *node,
uint64_t now,
uint64_t nwid,
uint64_t sourceMac,
uint64_t destMac,
unsigned int etherType,
unsigned int vlanId,
const void *frameData,
unsigned int frameLength,
volatile uint64_t *nextBackgroundTaskDeadline);
/**
* Perform periodic background operations
*
* @param node Node instance
* @param now Current clock in milliseconds
* @param nextBackgroundTaskDeadline Value/result: set to deadline for next call to processBackgroundTasks()
* @return OK (0) or error code if a fatal error condition has occurred
*/
enum ZT_ResultCode ZT_Node_processBackgroundTasks(ZT_Node *node,uint64_t now,volatile uint64_t *nextBackgroundTaskDeadline);
/**
* Join a network
*
* This may generate calls to the port config callback before it returns,
* or these may be deffered if a netconf is not available yet.
*
* If we are already a member of the network, nothing is done and OK is
* returned.
*
* @param node Node instance
* @param nwid 64-bit ZeroTier network ID
* @param uptr An arbitrary pointer to associate with this network (default: NULL)
* @return OK (0) or error code if a fatal error condition has occurred
*/
enum ZT_ResultCode ZT_Node_join(ZT_Node *node,uint64_t nwid,void *uptr);
/**
* Leave a network
*
* If a port has been configured for this network this will generate a call
* to the port config callback with a NULL second parameter to indicate that
* the port is now deleted.
*
* The uptr parameter is optional and is NULL by default. If it is not NULL,
* the pointer it points to is set to this network's uptr on success.
*
* @param node Node instance
* @param nwid 64-bit network ID
* @param uptr Target pointer is set to uptr (if not NULL)
* @return OK (0) or error code if a fatal error condition has occurred
*/
enum ZT_ResultCode ZT_Node_leave(ZT_Node *node,uint64_t nwid,void **uptr);
/**
* Subscribe to an Ethernet multicast group
*
* ADI stands for additional distinguishing information. This defaults to zero
* and is rarely used. Right now its only use is to enable IPv4 ARP to scale,
* and this must be done.
*
* For IPv4 ARP, the implementation must subscribe to 0xffffffffffff (the
* broadcast address) but with an ADI equal to each IPv4 address in host
* byte order. This converts ARP from a non-scalable broadcast protocol to
* a scalable multicast protocol with perfect address specificity.
*
* If this is not done, ARP will not work reliably.
*
* Multiple calls to subscribe to the same multicast address will have no
* effect. It is perfectly safe to do this.
*
* This does not generate an update call to networkConfigCallback().
*
* @param node Node instance
* @param nwid 64-bit network ID
* @param multicastGroup Ethernet multicast or broadcast MAC (least significant 48 bits)
* @param multicastAdi Multicast ADI (least significant 32 bits only, use 0 if not needed)
* @return OK (0) or error code if a fatal error condition has occurred
*/
enum ZT_ResultCode ZT_Node_multicastSubscribe(ZT_Node *node,uint64_t nwid,uint64_t multicastGroup,unsigned long multicastAdi);
/**
* Unsubscribe from an Ethernet multicast group (or all groups)
*
* If multicastGroup is zero (0), this will unsubscribe from all groups. If
* you are not subscribed to a group this has no effect.
*
* This does not generate an update call to networkConfigCallback().
*
* @param node Node instance
* @param nwid 64-bit network ID
* @param multicastGroup Ethernet multicast or broadcast MAC (least significant 48 bits)
* @param multicastAdi Multicast ADI (least significant 32 bits only, use 0 if not needed)
* @return OK (0) or error code if a fatal error condition has occurred
*/
enum ZT_ResultCode ZT_Node_multicastUnsubscribe(ZT_Node *node,uint64_t nwid,uint64_t multicastGroup,unsigned long multicastAdi);
/**
* Get this node's 40-bit ZeroTier address
*
* @param node Node instance
* @return ZeroTier address (least significant 40 bits of 64-bit int)
*/
uint64_t ZT_Node_address(ZT_Node *node);
/**
* Get the status of this node
*
* @param node Node instance
* @param status Buffer to fill with current node status
*/
void ZT_Node_status(ZT_Node *node,ZT_NodeStatus *status);
/**
* Get a list of known peer nodes
*
* The pointer returned here must be freed with freeQueryResult()
* when you are done with it.
*
* @param node Node instance
* @return List of known peers or NULL on failure
*/
ZT_PeerList *ZT_Node_peers(ZT_Node *node);
/**
* Get the status of a virtual network
*
* The pointer returned here must be freed with freeQueryResult()
* when you are done with it.
*
* @param node Node instance
* @param nwid 64-bit network ID
* @return Network configuration or NULL if we are not a member of this network
*/
ZT_VirtualNetworkConfig *ZT_Node_networkConfig(ZT_Node *node,uint64_t nwid);
/**
* Enumerate and get status of all networks
*
* @param node Node instance
* @return List of networks or NULL on failure
*/
ZT_VirtualNetworkList *ZT_Node_networks(ZT_Node *node);
/**
* Free a query result buffer
*
* Use this to free the return values of listNetworks(), listPeers(), etc.
*
* @param node Node instance
* @param qr Query result buffer
*/
void ZT_Node_freeQueryResult(ZT_Node *node,void *qr);
/**
* Add a local interface address
*
* This is used to make ZeroTier aware of those local interface addresses
* that you wish to use for ZeroTier communication. This is optional, and if
* it is not used ZeroTier will rely upon upstream peers (and roots) to
* perform empirical address discovery and NAT traversal. But the use of this
* method is recommended as it improves peer discovery when both peers are
* on the same LAN.
*
* It is the responsibility of the caller to take care that these are never
* ZeroTier interface addresses, whether these are assigned by ZeroTier or
* are otherwise assigned to an interface managed by this ZeroTier instance.
* This can cause recursion or other undesirable behavior.
*
* This returns a boolean indicating whether or not the address was
* accepted. ZeroTier will only communicate over certain address types
* and (for IP) address classes.
*
* @param addr Local interface address
* @return Boolean: non-zero if address was accepted and added
*/
int ZT_Node_addLocalInterfaceAddress(ZT_Node *node,const struct sockaddr_storage *addr);
/**
* Clear local interface addresses
*/
void ZT_Node_clearLocalInterfaceAddresses(ZT_Node *node);
/**
* Set a network configuration master instance for this node
*
* Normal nodes should not need to use this. This is for nodes with
* special compiled-in support for acting as network configuration
* masters / controllers.
*
* The supplied instance must be a C++ object that inherits from the
* NetworkConfigMaster base class in node/. No type checking is performed,
* so a pointer to anything else will result in a crash.
*
* @param node ZertTier One node
* @param networkConfigMasterInstance Instance of NetworkConfigMaster C++ class or NULL to disable
* @return OK (0) or error code if a fatal error condition has occurred
*/
void ZT_Node_setNetconfMaster(ZT_Node *node,void *networkConfigMasterInstance);
/**
* Initiate a VL1 circuit test
*
* This sends an initial VERB_CIRCUIT_TEST and reports results back to the
* supplied callback until circuitTestEnd() is called. The supplied
* ZT_CircuitTest structure should be initially zeroed and then filled
* in with settings and hops.
*
* It is the caller's responsibility to call circuitTestEnd() and then
* to dispose of the test structure. Otherwise this node will listen
* for results forever.
*
* @param node Node instance
* @param test Test configuration
* @param reportCallback Function to call each time a report is received
* @return OK or error if, for example, test is too big for a packet or support isn't compiled in
*/
enum ZT_ResultCode ZT_Node_circuitTestBegin(ZT_Node *node,ZT_CircuitTest *test,void (*reportCallback)(ZT_Node *, ZT_CircuitTest *,const ZT_CircuitTestReport *));
/**
* Stop listening for results to a given circuit test
*
* This does not free the 'test' structure. The caller may do that
* after calling this method to unregister it.
*
* Any reports that are received for a given test ID after it is
* terminated are ignored.
*
* @param node Node instance
* @param test Test configuration to unregister
*/
void ZT_Node_circuitTestEnd(ZT_Node *node,ZT_CircuitTest *test);
/**
* Initialize cluster operation
*
* This initializes the internal structures and state for cluster operation.
* It takes two function pointers. The first is to a function that can be
* used to send data to cluster peers (mechanism is not defined by Node),
* and the second is to a function that can be used to get the location of
* a physical address in X,Y,Z coordinate space (e.g. as cartesian coordinates
* projected from the center of the Earth).
*
* Send function takes an arbitrary pointer followed by the cluster member ID
* to send data to, a pointer to the data, and the length of the data. The
* maximum message length is ZT_CLUSTER_MAX_MESSAGE_LENGTH (65535). Messages
* must be delivered whole and may be dropped or transposed, though high
* failure rates are undesirable and can cause problems. Validity checking or
* CRC is also not required since the Node validates the authenticity of
* cluster messages using cryptogrphic methods and will silently drop invalid
* messages.
*
* Address to location function is optional and if NULL geo-handoff is not
* enabled (in this case x, y, and z in clusterInit are also unused). It
* takes an arbitrary pointer followed by a physical address and three result
* parameters for x, y, and z. It returns zero on failure or nonzero if these
* three coordinates have been set. Coordinate space is arbitrary and can be
* e.g. coordinates on Earth relative to Earth's center. These can be obtained
* from latitutde and longitude with versions of the Haversine formula.
*
* See: http://stackoverflow.com/questions/1185408/converting-from-longitude-latitude-to-cartesian-coordinates
*
* Neither the send nor the address to location function should block. If the
* address to location function does not have a location for an address, it
* should return zero and then look up the address for future use since it
* will be called again in (typically) 1-3 minutes.
*
* Note that both functions can be called from any thread from which the
* various Node functions are called, and so must be thread safe if multiple
* threads are being used.
*
* @param node Node instance
* @param myId My cluster member ID (less than or equal to ZT_CLUSTER_MAX_MEMBERS)
* @param zeroTierPhysicalEndpoints Preferred physical address(es) for ZeroTier clients to contact this cluster member (for peer redirect)
* @param numZeroTierPhysicalEndpoints Number of physical endpoints in zeroTierPhysicalEndpoints[] (max allowed: 255)
* @param x My cluster member's X location
* @param y My cluster member's Y location
* @param z My cluster member's Z location
* @param sendFunction Function to be called to send data to other cluster members
* @param sendFunctionArg First argument to sendFunction()
* @param addressToLocationFunction Function to be called to get the location of a physical address or NULL to disable geo-handoff
* @param addressToLocationFunctionArg First argument to addressToLocationFunction()
* @return OK or UNSUPPORTED_OPERATION if this Node was not built with cluster support
*/
enum ZT_ResultCode ZT_Node_clusterInit(
ZT_Node *node,
unsigned int myId,
const struct sockaddr_storage *zeroTierPhysicalEndpoints,
unsigned int numZeroTierPhysicalEndpoints,
int x,
int y,
int z,
void (*sendFunction)(void *,unsigned int,const void *,unsigned int),
void *sendFunctionArg,
int (*addressToLocationFunction)(void *,const struct sockaddr_storage *,int *,int *,int *),
void *addressToLocationFunctionArg);
/**
* Add a member to this cluster
*
* Calling this without having called clusterInit() will do nothing.
*
* @param node Node instance
* @param memberId Member ID (must be less than or equal to ZT_CLUSTER_MAX_MEMBERS)
* @return OK or error if clustering is disabled, ID invalid, etc.
*/
enum ZT_ResultCode ZT_Node_clusterAddMember(ZT_Node *node,unsigned int memberId);
/**
* Remove a member from this cluster
*
* Calling this without having called clusterInit() will do nothing.
*
* @param node Node instance
* @param memberId Member ID to remove (nothing happens if not present)
*/
void ZT_Node_clusterRemoveMember(ZT_Node *node,unsigned int memberId);
/**
* Handle an incoming cluster state message
*
* The message itself contains cluster member IDs, and invalid or badly
* addressed messages will be silently discarded.
*
* Calling this without having called clusterInit() will do nothing.
*
* @param node Node instance
* @param msg Cluster message
* @param len Length of cluster message
*/
void ZT_Node_clusterHandleIncomingMessage(ZT_Node *node,const void *msg,unsigned int len);
/**
* Get the current status of the cluster from this node's point of view
*
* Calling this without clusterInit() or without cluster support will just
* zero out the structure and show a cluster size of zero.
*
* @param node Node instance
* @param cs Cluster status structure to fill with data
*/
void ZT_Node_clusterStatus(ZT_Node *node,ZT_ClusterStatus *cs);
/**
* Do things in the background until Node dies
*
* This function can be called from one or more background threads to process
* certain tasks in the background to improve foreground performance. It will
* not return until the Node is shut down. If threading is not enabled in
* this build it will return immediately and will do nothing.
*
* This is completely optional. If this is never called, all processing is
* done in the foreground in the various processXXXX() methods.
*
* This does NOT replace or eliminate the need to call the normal
* processBackgroundTasks() function in your main loop. This mechanism is
* used to offload the processing of expensive mssages onto background
* handler threads to prevent foreground performance degradation under
* high load.
*
* @param node Node instance
*/
void ZT_Node_backgroundThreadMain(ZT_Node *node);
/**
* Get ZeroTier One version
*
* @param major Result: major version
* @param minor Result: minor version
* @param revision Result: revision
*/
void ZT_version(int *major,int *minor,int *revision);
#ifdef __cplusplus
}
#endif
#endif