ast_h323.cpp

来自「一个非常美妙的proxy。功能强大。基于sip的协议。如果还要的话」· C++ 代码 · 共 1,533 行 · 第 1/3 页

#define _GNU_SOURCE
/*
 * ast_h323.cpp
 *
 * OpenH323 Channel Driver for ASTERISK PBX.
 *			By  Jeremy McNamara
 *			For The NuFone Network
 * 
 * chan_h323 has been derived from code created by
 *               Michael Manousos and Mark Spencer
 *
 * This file is part of the chan_h323 driver for Asterisk
 *
 * chan_h323 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 2 of the License, or
 * (at your option) any later version. 
 *
 * chan_h323 is distributed 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, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 * Version Info: $Id: ast_h323.cpp 7221 2005-11-29 18:24:39Z kpfleming $
 */
#include <arpa/inet.h>

#include <list>
#include <string>
#include <algorithm>

#include <ptlib.h>
#include <h323.h>
#include <h323pdu.h>
#include <mediafmt.h>
#include <lid.h>

#ifdef __cplusplus
extern "C" {
#endif
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#ifdef __cplusplus
}
#endif

#include "chan_h323.h"
#include "ast_h323.h"

/* PWlib Required Components  */
#define MAJOR_VERSION 1
#define MINOR_VERSION 0
#define BUILD_TYPE    ReleaseCode
#define BUILD_NUMBER  0

/** Counter for the number of connections */
int channelsOpen;

/* DTMF Mode */
int mode = H323_DTMF_RFC2833;

/**
 * We assume that only one endPoint should exist.
 * The application cannot run the h323_end_point_create() more than once
 * FIXME: Singleton this, for safety
 */
MyH323EndPoint *endPoint = NULL;

/** PWLib entry point */
MyProcess *localProcess = NULL;

class PAsteriskLog : public PObject, public iostream {
	PCLASSINFO(PAsteriskLog, PObject);

	public:
	PAsteriskLog() : iostream(cout.rdbuf()) { init(&buffer); }
	~PAsteriskLog() { flush(); }

	private:
	PAsteriskLog(const PAsteriskLog &) : iostream(cout.rdbuf()) { }
	PAsteriskLog & operator=(const PAsteriskLog &) { return *this; }

	class Buffer : public streambuf {
		public:
		virtual int overflow(int=EOF);
		virtual int underflow();
		virtual int sync();
		PString string;
	} buffer;
	friend class Buffer;
};

static PAsteriskLog *logstream = NULL;

int PAsteriskLog::Buffer::overflow(int c)
{
	if (pptr() >= epptr()) {
		int ppos = pptr() - pbase();
		char *newptr = string.GetPointer(string.GetSize() + 2000);
		setp(newptr, newptr + string.GetSize() - 1);
		pbump(ppos);
	}
	if (c != EOF) {
		*pptr() = (char)c;
		pbump(1);
	}
	return 0;
}

int PAsteriskLog::Buffer::underflow()
{
	return EOF;
}

int PAsteriskLog::Buffer::sync()
{
	char *str = strdup(string);
	char *s, *s1;
	char c;

	/* Pass each line with different ast_verbose() call */
	for (s = str; s && *s; s = s1) {
		s1 = strchr(s, '\n');
		if (!s1)
			s1 = s + strlen(s);
		else
			s1++;
		c = *s1;
		*s1 = '\0';
		ast_verbose("%s", s);
		*s1 = c;
	}
	free(str);

	string = PString();
	char *base = string.GetPointer(2000);
	setp(base, base + string.GetSize() - 1);
	return 0;
}

#define cout (*logstream)

MyProcess::MyProcess(): PProcess("The NuFone Network's", "H.323 Channel Driver for Asterisk",
             MAJOR_VERSION, MINOR_VERSION, BUILD_TYPE, BUILD_NUMBER)
{
	/* Fix missed one in PWLib */
	PX_firstTimeStart = FALSE;
	Resume();
}

void MyProcess::Main()
{
	cout << "  == Creating H.323 Endpoint" << endl;
	endPoint = new MyH323EndPoint();
	/* Due to a bug in the H.323 recomendation/stack we should request a sane
	   amount of bandwidth from the GK - this function is ignored if not using a GK 
	   We are requesting 128 (64k in each direction), which is the worst case codec. */
        endPoint->SetInitialBandwidth(1280);

	PTrace::Initialise(0, NULL, PTrace::Timestamp | PTrace::Thread | PTrace::FileAndLine);
	PTrace::SetStream(logstream);
}

void PAssertFunc(const char *msg)
{
	ast_log(LOG_ERROR, "%s\n", msg);
	/* XXX: Probably we need to crash here */
}

H323_REGISTER_CAPABILITY(H323_G7231Capability, OPAL_G7231);
H323_REGISTER_CAPABILITY(AST_G729Capability,  OPAL_G729);
H323_REGISTER_CAPABILITY(AST_G729ACapability, OPAL_G729A);

H323_G7231Capability::H323_G7231Capability(BOOL annexA_)
  : H323AudioCapability(7, 4)
{
  	annexA = annexA_;
}

PObject::Comparison H323_G7231Capability::Compare(const PObject & obj) const
{
  	Comparison result = H323AudioCapability::Compare(obj);
  	if (result != EqualTo) {
    		return result;
	}
  	PINDEX otherAnnexA = ((const H323_G7231Capability &)obj).annexA;
  	if (annexA < otherAnnexA) {
    		return LessThan;
	}
  	if (annexA > otherAnnexA) {
    		return GreaterThan;
	}
	return EqualTo;
}

PObject * H323_G7231Capability::Clone() const
{
 	 return new H323_G7231Capability(*this);
}

PString H323_G7231Capability::GetFormatName() const
{
  	return OPAL_G7231;
}

unsigned H323_G7231Capability::GetSubType() const
{
  	return H245_AudioCapability::e_g7231;
}

BOOL H323_G7231Capability::OnSendingPDU(H245_AudioCapability & cap,
                                          unsigned packetSize) const
{
  	cap.SetTag(H245_AudioCapability::e_g7231);
  	H245_AudioCapability_g7231 & g7231 = cap;
  	g7231.m_maxAl_sduAudioFrames = packetSize;
  	g7231.m_silenceSuppression = annexA;
  	return TRUE;
}

BOOL H323_G7231Capability::OnReceivedPDU(const H245_AudioCapability & cap,
                                           unsigned & packetSize)
{
	if (cap.GetTag() != H245_AudioCapability::e_g7231) {
    		return FALSE;
	}
  	const H245_AudioCapability_g7231 & g7231 = cap;
  	packetSize = g7231.m_maxAl_sduAudioFrames;
  	annexA = g7231.m_silenceSuppression;
  	return TRUE;
}

H323Codec * H323_G7231Capability::CreateCodec(H323Codec::Direction direction) const
{
  	return NULL;
}

AST_G729Capability::AST_G729Capability()
  : H323AudioCapability(24, 2)
{
}

PObject * AST_G729Capability::Clone() const
{
  	return new AST_G729Capability(*this);
}

unsigned AST_G729Capability::GetSubType() const
{
  	return H245_AudioCapability::e_g729;
}

PString AST_G729Capability::GetFormatName() const
{
  	return OPAL_G729;
}

H323Codec * AST_G729Capability::CreateCodec(H323Codec::Direction direction) const
{
  	return NULL;
}

AST_G729ACapability::AST_G729ACapability()
  : H323AudioCapability(24, 6)
{
}

PObject * AST_G729ACapability::Clone() const
{
  	return new AST_G729ACapability(*this);
}

unsigned AST_G729ACapability::GetSubType() const
{
  	return H245_AudioCapability::e_g729AnnexA;
}

PString AST_G729ACapability::GetFormatName() const
{
  	return OPAL_G729A;
}

H323Codec * AST_G729ACapability::CreateCodec(H323Codec::Direction direction) const
{
  	return NULL;
}

/** MyH323EndPoint 
  */
MyH323EndPoint::MyH323EndPoint()
		: H323EndPoint()
{
	// Capabilities will be negotiated on per-connection basis
	capabilities.RemoveAll();
}

/** The fullAddress parameter is used directly in the MakeCall method so
  * the General form for the fullAddress argument is :
  * [alias@][transport$]host[:port]
  * default values:	alias = the same value as host.
  *					transport = ip.
  *					port = 1720.
  */
int MyH323EndPoint::MakeCall(const PString & dest, PString & token, unsigned int *callReference, call_options_t *opts)
{
	PString fullAddress;
	MyH323Connection * connection;

	/* Determine whether we are using a gatekeeper or not. */
	if (GetGatekeeper()) {
		fullAddress = dest;
		if (h323debug) {
			cout << " -- Making call to " << fullAddress << " using gatekeeper." << endl;
		}
	} else {
		fullAddress = dest; 
		if (h323debug) {
			cout << " -- Making call to " << fullAddress << " without gatekeeper." << endl;
		}
	}
	if (!(connection = (MyH323Connection *)H323EndPoint::MakeCallLocked(fullAddress, token, opts))) {
		if (h323debug) {
			cout << "Error making call to \"" << fullAddress << '"' << endl;
		}
		return 1;
	}
	*callReference = connection->GetCallReference();	

	if (opts->cid_num) {
		connection->ast_cid_num = PString(opts->cid_num);
	}
	if (opts->cid_name) {
		connection->ast_cid_name = PString(opts->cid_name);
		connection->SetLocalPartyName(connection->ast_cid_name);
	}

	connection->dtmfCodec = (RTP_DataFrame::PayloadTypes)opts->dtmfcodec;

	if (h323debug) {
		cout << "\t-- " << GetLocalUserName() << " is calling host " << fullAddress << endl;
		cout << "\t-- Call token is " << (const char *)token << endl;
		cout << "\t-- Call reference is " << *callReference << endl;
		cout << "\t-- DTMF Payload is " << connection->dtmfCodec << endl;
	}
	connection->Unlock(); 	
	return 0;
}

void MyH323EndPoint::SetEndpointTypeInfo( H225_EndpointType & info ) const
{
  	H323EndPoint::SetEndpointTypeInfo(info);

	if (terminalType == e_GatewayOnly){
		info.RemoveOptionalField(H225_EndpointType::e_terminal);
		info.IncludeOptionalField(H225_EndpointType::e_gateway);
	}

  	info.m_gateway.IncludeOptionalField(H225_GatewayInfo::e_protocol);
  	info.m_gateway.m_protocol.SetSize(1);
  	H225_SupportedProtocols &protocol=info.m_gateway.m_protocol[0];
  	protocol.SetTag(H225_SupportedProtocols::e_voice);
  	PINDEX as=SupportedPrefixes.GetSize();
  	((H225_VoiceCaps &)protocol).m_supportedPrefixes.SetSize(as);
  	for (PINDEX p=0; p<as; p++) {
		H323SetAliasAddress(SupportedPrefixes[p], ((H225_VoiceCaps &)protocol).m_supportedPrefixes[p].m_prefix, H225_AliasAddress::e_dialedDigits);
  	}
}

void MyH323EndPoint::SetGateway(void)
{
	terminalType = e_GatewayOnly;
}

BOOL MyH323EndPoint::ClearCall(const PString & token, H323Connection::CallEndReason reason)
{
	if (h323debug) {
		cout << "\t-- ClearCall: Request to clear call with token " << token << ", cause " << reason << endl;
	}
	return H323EndPoint::ClearCall(token, reason);
}

BOOL MyH323EndPoint::ClearCall(const PString & token)
{
	if (h323debug) {
		cout << "\t-- ClearCall: Request to clear call with token " << token << endl;
	}
	return H323EndPoint::ClearCall(token, H323Connection::EndedByLocalUser);
}

void MyH323EndPoint::SendUserTone(const PString &token, char tone)
{
	H323Connection *connection = NULL;
		
	connection = FindConnectionWithLock(token);
	if (connection != NULL) {
		connection->SendUserInputTone(tone, 500);
		connection->Unlock();
	}
}

void MyH323EndPoint::OnClosedLogicalChannel(H323Connection & connection, const H323Channel & channel)
{
	channelsOpen--;
	if (h323debug) {
		cout << "\t\tchannelsOpen = " << channelsOpen << endl;
	}
	H323EndPoint::OnClosedLogicalChannel(connection, channel);
}

BOOL MyH323EndPoint::OnConnectionForwarded(H323Connection & connection,
 		const PString & forwardParty,
 		const H323SignalPDU & pdu)
 {
 	if (h323debug) {
	 	cout << "\t-- Call Forwarded to " << forwardParty << endl;
 	}
	return FALSE;
 }
 
BOOL MyH323EndPoint::ForwardConnection(H323Connection & connection,
 		const PString & forwardParty,
 		const H323SignalPDU & pdu)
{
 	if (h323debug) {
 		cout << "\t-- Forwarding call to " << forwardParty << endl;
 	}
	return H323EndPoint::ForwardConnection(connection, forwardParty, pdu);
}

void MyH323EndPoint::OnConnectionEstablished(H323Connection & connection, const PString & estCallToken)
{
	if (h323debug) {
		cout << "\t=-= In OnConnectionEstablished for call " << connection.GetCallReference() << endl;
		cout << "\t\t-- Connection Established with \"" << connection.GetRemotePartyName() << "\"" << endl;
	}
	on_connection_established(connection.GetCallReference(), (const char *)connection.GetCallToken());
}

/** OnConnectionCleared callback function is called upon the dropping of an established
  * H323 connection. 
  */
void MyH323EndPoint::OnConnectionCleared(H323Connection & connection, const PString & clearedCallToken)
{
	PString remoteName = connection.GetRemotePartyName();

	switch (connection.GetCallEndReason()) {
		case H323Connection::EndedByCallForwarded:
			if (h323debug) {
				cout << "-- " << remoteName << " has forwarded the call" << endl;
			}
			break;
		case H323Connection::EndedByRemoteUser:
			if (h323debug) {
				cout << "-- " << remoteName << " has cleared the call" << endl;
			}
			break;
		case H323Connection::EndedByCallerAbort:
			if (h323debug) {
				cout << "-- " << remoteName << " has stopped calling" << endl;
			}
			break;
		case H323Connection::EndedByRefusal:
			if (h323debug) {
				cout << "-- " << remoteName << " did not accept your call" << endl;
			}
			break;
		case H323Connection::EndedByRemoteBusy:
			if (h323debug) {
				cout << "-- " << remoteName << " was busy" << endl;
			}
			break;
		case H323Connection::EndedByRemoteCongestion:
			if (h323debug) {
				cout << "-- Congested link to " << remoteName << endl;
			}
			break;
		case H323Connection::EndedByNoAnswer:
			if (h323debug) {
				cout << "-- " << remoteName << " did not answer your call" << endl;
			}
			break;
		case H323Connection::EndedByTransportFail:
			if (h323debug) {
				cout << "-- Call with " << remoteName << " ended abnormally" << endl;
			}
			break;
		case H323Connection::EndedByCapabilityExchange:
			if (h323debug) {
				cout << "-- Could not find common codec with " << remoteName << endl;
			}
			break;
		case H323Connection::EndedByNoAccept:
			if (h323debug) {
				cout << "-- Did not accept incoming call from " << remoteName << endl;
			}
			break;
		case H323Connection::EndedByAnswerDenied:
			if (h323debug) {
				cout << "-- Refused incoming call from " << remoteName << endl;
			}
			break;
		case H323Connection::EndedByNoUser:
			if (h323debug) {
				cout << "-- Remote endpoint could not find user: " << remoteName << endl;
			}
			break;
		case H323Connection::EndedByNoBandwidth:
			if (h323debug) {