PSTUNClient Class Reference

#include <pstun.h>

Inheritance diagram for PSTUNClient:


Public Types
	DefaultPort = 3478
	UnknownNat
	OpenNat
	ConeNat
	RestrictedNat
	PortRestrictedNat
	SymmetricNat
	SymmetricFirewall
	BlockedNat
	PartialBlockedNat
	NumNatTypes
enum	{ DefaultPort = 3478 }
enum	NatTypes { UnknownNat, OpenNat, ConeNat, RestrictedNat, PortRestrictedNat, SymmetricNat, SymmetricFirewall, BlockedNat, PartialBlockedNat, NumNatTypes }
Public Member Functions
	PSTUNClient ()
	PSTUNClient (const PString &server, WORD portBase=0, WORD portMax=0, WORD portPairBase=0, WORD portPairMax=0)
	PSTUNClient (const PIPSocket::Address &serverAddress, WORD serverPort=DefaultPort, WORD portBase=0, WORD portMax=0, WORD portPairBase=0, WORD portPairMax=0)
void	Initialise (const PString &server, WORD portBase=0, WORD portMax=0, WORD portPairBase=0, WORD portPairMax=0)
virtual PString	GetName () const
virtual bool	GetServerAddress (PIPSocket::Address &address, WORD &port) const
PBoolean	SetServer (const PString &server)
PBoolean	SetServer (const PIPSocket::Address &serverAddress, WORD serverPort=0)
NatTypes	GetNatType (PBoolean force=PFalse)
PString	GetNatTypeName (PBoolean force=PFalse)
RTPSupportTypes	GetRTPSupport (PBoolean force=PFalse)
virtual PBoolean	GetExternalAddress (PIPSocket::Address &externalAddress, const PTimeInterval &maxAge=1000)
virtual bool	GetInterfaceAddress (PIPSocket::Address &internalAddress) const
void	InvalidateCache ()
PBoolean	CreateSocket (PUDPSocket *&socket, const PIPSocket::Address &binding=PIPSocket::GetDefaultIpAny(), WORD localPort=0)
virtual PBoolean	CreateSocketPair (PUDPSocket &socket1, PUDPSocket &socket2, const PIPSocket::Address &binding=PIPSocket::GetDefaultIpAny())
const PTimeInterval	GetTimeout () const
void	SetTimeout (const PTimeInterval &timeout)
PINDEX	GetRetries () const
void	SetRetries (PINDEX retries)
PINDEX	GetSocketsForPairing () const
void	SetSocketsForPairing (PINDEX numSockets)
virtual bool	IsAvailable (const PIPSocket::Address &binding=PIPSocket::GetDefaultIpAny())
Static Public Member Functions
static PStringList	GetNatMethodName ()
static PString	GetNatTypeString (NatTypes type)
Protected Member Functions
bool	OpenSocket (PUDPSocket &socket, PortInfo &portInfo, const PIPSocket::Address &binding)
Protected Attributes
PString	serverHost
WORD	serverPort
PTimeInterval	replyTimeout
PINDEX	pollRetries
PINDEX	numSocketsForPairing
NatTypes	natType
PIPSocket::Address	cachedServerAddress
PIPSocket::Address	cachedExternalAddress
PIPSocket::Address	interfaceAddress
PTime	timeAddressObtained

Detailed Description

STUN client.

Member Enumeration Documentation

anonymous enum

Enumerator:

DefaultPort

enum PSTUNClient::NatTypes

Enumerator:

UnknownNat
OpenNat
ConeNat
RestrictedNat
PortRestrictedNat
SymmetricNat
SymmetricFirewall
BlockedNat
PartialBlockedNat
NumNatTypes

Constructor & Destructor Documentation

PSTUNClient::PSTUNClient ( )

PSTUNClient::PSTUNClient	(	const PString &	server,
		WORD	portBase = `0`,
		WORD	portMax = `0`,
		WORD	portPairBase = `0`,
		WORD	portPairMax = `0`
	)

PSTUNClient::PSTUNClient	(	const PIPSocket::Address &	serverAddress,
		WORD	serverPort = `DefaultPort`,
		WORD	portBase = `0`,
		WORD	portMax = `0`,
		WORD	portPairBase = `0`,
		WORD	portPairMax = `0`
	)

Member Function Documentation

PBoolean PSTUNClient::CreateSocket	(	PUDPSocket *&	socket,
		const PIPSocket::Address &	binding = `PIPSocket::GetDefaultIpAny()`,
		WORD	localPort = `0`
	)			`[virtual]`

Create a single socket. The STUN protocol is used to create a socket for which the external IP address and port numbers are known. A PUDPSocket descendant is returned which will, in response to GetLocalAddress() return the externally visible IP and port rather than the local machines IP and socket.

The will create a new socket pointer. It is up to the caller to make sure the socket is deleted to avoid memory leaks.

The socket pointer is set to NULL if the function fails and returns PFalse.

Implements PNatMethod.

virtual PBoolean PSTUNClient::CreateSocketPair	(	PUDPSocket *&	socket1,
		PUDPSocket *&	socket2,
		const PIPSocket::Address &	binding = `PIPSocket::GetDefaultIpAny()`
	)			`[virtual]`

Create a socket pair. The STUN protocol is used to create a pair of sockets with adjacent port numbers for which the external IP address and port numbers are known. PUDPSocket descendants are returned which will, in response to GetLocalAddress() return the externally visible IP and port rather than the local machines IP and socket.

The will create new socket pointers. It is up to the caller to make sure the sockets are deleted to avoid memory leaks.

The socket pointers are set to NULL if the function fails and returns PFalse.

Implements PNatMethod.

virtual PBoolean PSTUNClient::GetExternalAddress	(	PIPSocket::Address &	externalAddress,
		const PTimeInterval &	maxAge = `1000`
	)			`[virtual]`

Determine the external router address. This will send UDP packets out using the STUN protocol to determine the intervening routers external IP address.

A cached address is returned provided it is no older than the time specified.

Parameters:

externalAddress	External address of router
maxAge	Maximum age for caching

Implements PNatMethod.

virtual bool PSTUNClient::GetInterfaceAddress ( PIPSocket::Address & internalAddress ) const [virtual]

Return the interface NAT router is using.

Implements PNatMethod.

virtual PString PSTUNClient::GetName ( ) const [inline, virtual]

Get the NAT traversal method name

Implements PNatMethod.

static PStringList PSTUNClient::GetNatMethodName ( ) [inline, static]

Get the NAT Method Name

NatTypes PSTUNClient::GetNatType ( PBoolean force = PFalse )

Determine via the STUN protocol the NAT type for the router. This will cache the last determine NAT type. Use the force variable to guarantee an up to date value.

Parameters:

force

Force a new check

PString PSTUNClient::GetNatTypeName ( PBoolean force = PFalse ) [inline]

Determine via the STUN protocol the NAT type for the router. As for GetNatType() but returns an English string for the type.

Parameters:

force

Force a new check

static PString PSTUNClient::GetNatTypeString ( NatTypes type ) [static]

Get NatTypes enumeration as an English string for the type.

Parameters:

type

NAT Type to get name of

PINDEX PSTUNClient::GetRetries ( ) const [inline]

Get the number of retries for responses from STUN server.

RTPSupportTypes PSTUNClient::GetRTPSupport ( PBoolean force = PFalse ) [virtual]

Return an indication if the current STUN type supports RTP Use the force variable to guarantee an up to date test

Parameters:

force

Force a new check

Implements PNatMethod.

virtual bool PSTUNClient::GetServerAddress	(	PIPSocket::Address &	address,
		WORD &	port
	)			const `[virtual]`

Get the current server address and port being used.

Parameters:

address	Address of server
port	Port server is using.

Implements PNatMethod.

PINDEX PSTUNClient::GetSocketsForPairing ( ) const [inline]

Get the number of sockets to create in attempt to get a port pair. RTP requires a pair of consecutive ports. To get this several sockets must be opened and fired through the NAT firewall to get a pair. The busier the firewall the more sockets will be required.

const PTimeInterval PSTUNClient::GetTimeout ( ) const [inline]

Get the timeout for responses from STUN server.

void PSTUNClient::Initialise	(	const PString &	server,
		WORD	portBase = `0`,
		WORD	portMax = `0`,
		WORD	portPairBase = `0`,
		WORD	portPairMax = `0`
	)

void PSTUNClient::InvalidateCache ( )

Invalidates the cached addresses and modes. This allows to lazily update the external address cache at the next attempt to get the external address.

virtual bool PSTUNClient::IsAvailable ( const PIPSocket::Address & binding = PIPSocket::GetDefaultIpAny() ) [virtual]

Returns whether the Nat Method is ready and available in assisting in NAT Traversal. The principal is this function is to allow the EP to detect various methods and if a method is detected then this method is available for NAT traversal. The availablity of the STUN Method is dependant on the Type of NAT being used.

Parameters:

binding

Interface to see if NAT is available on

Implements PNatMethod.

bool PSTUNClient::OpenSocket	(	PUDPSocket &	socket,
		PortInfo &	portInfo,
		const PIPSocket::Address &	binding
	)			`[protected]`

void PSTUNClient::SetRetries ( PINDEX retries ) [inline]

Set the number of retries for responses from STUN server.

Parameters:

retries

Number of retries

PBoolean PSTUNClient::SetServer	(	const PIPSocket::Address &	serverAddress,
		WORD	serverPort = `0`
	)

Set the STUN server to use by IP address and port. If serverPort is zero then the default port of 3478 is used.

PBoolean PSTUNClient::SetServer ( const PString & server )

Set the STUN server to use. The server string may be of the form host:port. If :port is absent then the default port 3478 is used. The substring port can also be a service name as found in /etc/services. The host substring may be a DNS name or explicit IP address.

void PSTUNClient::SetSocketsForPairing ( PINDEX numSockets ) [inline]

Set the number of sockets to create in attempt to get a port pair. RTP requires a pair of consecutive ports. To get this several sockets must be opened and fired through the NAT firewall to get a pair. The busier the firewall the more sockets will be required.

Parameters:

numSockets

Number opf sockets to create

void PSTUNClient::SetTimeout ( const PTimeInterval & timeout ) [inline]

Set the timeout for responses from STUN server.

Parameters:

timeout

New timeout in milliseconds