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yate/libs/yiax/engine.cpp

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/**
* engine.cpp
* Yet Another IAX2 Stack
* This file is part of the YATE Project http://YATE.null.ro
*
* Yet Another Telephony Engine - a fully featured software PBX and IVR
* Copyright (C) 2004-2014 Null Team
* Author: Marian Podgoreanu
*
* This software is distributed under multiple licenses;
* see the COPYING file in the main directory for licensing
* information for this specific distribution.
*
* This use of this software may be subject to additional restrictions.
* See the LEGAL file in the main directory for details.
*
* 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.
*/
#include <yateiax.h>
#include <yateversn.h>
#include <stdlib.h>
#include <string.h>
using namespace TelEngine;
// Local call number to set when rejecting calls with missing call token
#define IAX2_CALLTOKEN_REJ_CALLNO 1
// Local call number to set when sending call token message
#define IAX2_CALLTOKEN_CALLNO 1
// Minimum value for local call numbers
#define IAX2_MIN_CALLNO 2
// Outgoing data adjust timestamp defaults
#define IAX2_ADJUSTTSOUT_THRES 120
#define IAX2_ADJUSTTSOUT_OVER 120
#define IAX2_ADJUSTTSOUT_UNDER 60
// Build an MD5 digest from secret, address, integer value and engine run id
// MD5(addr.host() + secret + addr.port() + t)
static void buildSecretDigest(String& buf, const String& secret, unsigned int t,
const SocketAddr& addr)
{
String tmp;
tmp << addr.host() << secret << addr.port() << t;
MD5 md5(tmp);
buf << md5.hexDigest();
}
IAXEngine::IAXEngine(const char* iface, int port, u_int32_t format, u_int32_t capab,
const NamedList* params, const char* name)
: Mutex(true,"IAXEngine"),
m_trunking(0),
m_name(name),
m_lastGetEvIndex(0),
m_exiting(false),
m_maxFullFrameDataLen(1400),
m_startLocalCallNo(0),
m_transListCount(64),
m_challengeTout(IAX2_CHALLENGETOUT_DEF),
m_callToken(false),
m_callTokenAge(10),
m_showCallTokenFailures(false),
m_printMsg(true),
m_callerNumType(0),
m_callingPres(0),
m_format(format),
m_formatVideo(0),
m_capability(capab),
m_adjustTsOutThreshold(IAX2_ADJUSTTSOUT_THRES),
m_adjustTsOutOverrun(IAX2_ADJUSTTSOUT_OVER),
m_adjustTsOutUnderrun(IAX2_ADJUSTTSOUT_UNDER),
m_mutexTrunk(false,"IAXEngine::Trunk"),
m_trunkInfoMutex(false,"IAXEngine::TrunkInfo")
{
debugName(m_name);
if ((port <= 0) || port > 65535)
port = 4569;
bool forceBind = true;
if (params) {
m_transListCount = params->getIntValue("translist_count",64,4,256);
m_maxFullFrameDataLen = params->getIntValue("maxfullframedatalen",1400,20);
m_callTokenSecret = params->getValue("calltoken_secret");
forceBind = params->getBoolValue("force_bind",true);
}
m_transList = new ObjList*[m_transListCount];
for (unsigned int i = 0; i < m_transListCount; i++)
m_transList[i] = new ObjList;
for(unsigned int i = 0; i <= IAX2_MAX_CALLNO; i++)
m_lUsedCallNo[i] = false;
if (!m_callTokenSecret)
for (unsigned int i = 0; i < 3; i++)
m_callTokenSecret << (int)(Random::random() ^ Time::now());
bind(iface,port,forceBind);
m_startLocalCallNo = 1 + (u_int16_t)(Random::random() % IAX2_MAX_CALLNO);
if (m_startLocalCallNo < IAX2_MIN_CALLNO)
m_startLocalCallNo = IAX2_MIN_CALLNO;
initialize(params ? *params : NamedList::empty());
}
IAXEngine::~IAXEngine()
{
for (int i = 0; i < m_transListCount; i++)
TelEngine::destruct(m_transList[i]);
delete[] m_transList;
}
IAXTransaction* IAXEngine::addFrame(const SocketAddr& addr, IAXFrame* frame)
{
if (!frame)
return 0;
IAXTransaction* tr = 0;
ObjList* l = 0;
Lock lock(this);
// Transaction exists for this frame?
// Incomplete transactions. They MUST receive a full frame with destination call number set
IAXFullFrame* full = frame->fullFrame();
if (full && full->destCallNo()) {
l = m_incompleteTransList.skipNull();
for (; l; l = l->next()) {
tr = static_cast<IAXTransaction*>(l->get());
if (!(tr && tr->localCallNo() == full->destCallNo() && addr == tr->remoteAddr()))
continue;
// Incomplete outgoing receiving call token
if (full->type() == IAXFrame::IAX &&
full->subclass() == IAXControl::CallToken) {
RefPointer<IAXTransaction> t = tr;
lock.drop();
if (!t)
return 0;
full->updateIEList(true);
IAXIEList* list = full->ieList();
DataBlock db;
if (list)
list->getBinary(IAXInfoElement::CALLTOKEN,db);
t->processCallToken(db);
t = 0;
return 0;
}
// Complete transaction
tr->m_rCallNo = frame->sourceCallNo();
m_incompleteTransList.remove(tr,false);
m_transList[frame->sourceCallNo() % m_transListCount]->append(tr);
XDebug(this,DebugAll,"New incomplete outgoing transaction completed (%u,%u) [%p]",
tr->localCallNo(),tr->remoteCallNo(),this);
return tr->processFrame(frame);
}
}
// Complete transactions
l = m_transList[frame->sourceCallNo() % m_transListCount];
if (l)
l = l->skipNull();
for (; l; l = l->skipNext()) {
tr = static_cast<IAXTransaction*>(l->get());
if (tr->remoteCallNo() != frame->sourceCallNo())
continue;
// Mini frame
if (!full) {
if (addr == tr->remoteAddr()) {
// keep transaction referenced but unlock the engine
RefPointer<IAXTransaction> t = tr;
lock.drop();
return t ? t->processFrame(frame) : 0;
}
continue;
}
// Full frame
// Has a local number assigned? If not, test socket
if (full->destCallNo() || addr == tr->remoteAddr()) {
// keep transaction referenced but unlock the engine
RefPointer<IAXTransaction> t = tr;
lock.drop();
return t ? t->processFrame(frame) : 0;
}
}
// Frame doesn't belong to an existing transaction
if (exiting()) {
sendInval(full,addr);
return 0;
}
// Test if it is a full frame with an IAX control message that needs a new transaction
if (!full || frame->type() != IAXFrame::IAX) {
if (full)
sendInval(full,addr);
return 0;
}
switch (full->subclass()) {
case IAXControl::New:
if (!checkCallToken(addr,*full))
return 0;
break;
case IAXControl::RegReq:
case IAXControl::RegRel:
case IAXControl::Poke:
break;
case IAXControl::Inval:
case IAXControl::FwDownl:
case IAXControl::TxCnt:
case IAXControl::TxAcc:
// These are often used as keepalives
return 0;
default:
if (full->destCallNo() == 0)
Debug(this,DebugAll,
"Unsupported incoming transaction Frame(%u,%u). Source call no: %u [%p]",
frame->type(),full->subclass(),full->sourceCallNo(),this);
else
Debug(this,DebugAll,"Unmatched Frame(%u,%u) for (%u,%u) [%p]",
frame->type(),full->subclass(),full->destCallNo(),
full->sourceCallNo(),this);
sendInval(full,addr);
return 0;
}
// Generate local number
u_int16_t lcn = generateCallNo();
if (lcn) {
// Create and add transaction
tr = IAXTransaction::factoryIn(this,full,lcn,addr);
if (tr)
m_transList[frame->sourceCallNo() % m_transListCount]->append(tr);
else
releaseCallNo(lcn);
}
if (!tr)
Debug(this,DebugInfo,"Failed to build incoming transaction for Frame(%u,%u) [%p]",
frame->type(),full->subclass(),this);
return tr;
}
IAXTransaction* IAXEngine::addFrame(const SocketAddr& addr, const unsigned char* buf, unsigned int len)
{
IAXFrame* frame = IAXFrame::parse(buf,len,this,&addr);
if (!frame)
return 0;
if (m_printMsg && frame->fullFrame() && debugAt(DebugInfo)) {
String s;
SocketAddr local;
m_socket.getSockName(local);
frame->fullFrame()->toString(s,local,addr,true);
Debug(this,DebugInfo,"Received frame [%p]%s",this,s.c_str());
}
IAXTransaction* tr = addFrame(addr,frame);
if (!tr)
frame->deref();
return tr;
}
// Find a complete transaction
IAXTransaction* IAXEngine::findTransaction(const SocketAddr& addr, u_int16_t rCallNo)
{
Lock lck(this);
ObjList* o = m_transList[rCallNo % m_transListCount]->skipNull();
for (; o; o = o->skipNext()) {
IAXTransaction* tr = static_cast<IAXTransaction*>(o->get());
if (tr->remoteCallNo() == rCallNo && addr == tr->remoteAddr())
return tr->ref() ? tr : 0;
}
return 0;
}
void IAXEngine::sendInval(IAXFullFrame* frame, const SocketAddr& addr)
{
if (!frame)
return;
// Check for frames that should not receive INVAL
if (frame->type() == IAXFrame::IAX && frame->subclass() == IAXControl::Inval)
return;
DDebug(this,DebugInfo,
"Sending INVAL for unmatched frame(%u,%u) with OSeq=%u ISeq=%u [%p]",
frame->type(),frame->subclass(),frame->oSeqNo(),frame->iSeqNo(),this);
IAXFullFrame* f = new IAXFullFrame(IAXFrame::IAX,IAXControl::Inval,frame->destCallNo(),
frame->sourceCallNo(),frame->iSeqNo(),frame->oSeqNo(),frame->timeStamp());
writeSocket(f->data().data(),f->data().length(),addr,f);
f->deref();
}
bool IAXEngine::process()
{
bool ok = false;
for (;;) {
IAXEvent* event = getEvent();
if (!event)
break;
ok = true;
if ((event->final() && !event->frameType()) || !event->getTransaction()) {
XDebug(this,DebugAll,"Deleting internal event type %u Frame(%u,%u) [%p]",
event->type(),event->frameType(),event->subclass(),this);
delete event;
continue;
}
processEvent(event);
}
return ok;
}
static inline void roundUp10(unsigned int& value)
{
unsigned int rest = value % 10;
if (rest)
value += 10 - rest;
}
// Initialize outgoing data timestamp adjust values
void IAXEngine::initOutDataAdjust(const NamedList& params, IAXTransaction* tr)
{
const String* thresS = 0;
const String* overS = 0;
const String* underS = 0;
NamedIterator iter(params);
for (const NamedString* ns = 0; 0 != (ns = iter.get());) {
if (ns->name() == YSTRING("adjust_ts_out_threshold"))
thresS = ns;
else if (ns->name() == YSTRING("adjust_ts_out_over"))
overS = ns;
else if (ns->name() == YSTRING("adjust_ts_out_under"))
underS = ns;
}
// No need to set transaction's data if no parameter found
if (tr && !(thresS || overS || underS))
return;
Lock lck(tr ? (Mutex*)tr : (Mutex*)this);
unsigned int thresDef = IAX2_ADJUSTTSOUT_THRES;
unsigned int overDef = IAX2_ADJUSTTSOUT_OVER;
unsigned int underDef = IAX2_ADJUSTTSOUT_UNDER;
if (tr) {
thresDef = tr->m_adjustTsOutThreshold;
overDef = tr->m_adjustTsOutOverrun;
underDef = tr->m_adjustTsOutUnderrun;
}
unsigned int thres = thresS ? thresS->toInteger(thresDef,0,20,300) : thresDef;
unsigned int over = overS ? overS->toInteger(overDef,0,10) : overDef;
unsigned int under = underS ? underS->toInteger(underDef,0,10) : underDef;
bool adjusted = false;
// Round down to multiple of 10
roundUp10(thres);
roundUp10(over);
roundUp10(under);
// Overrun must not be greater then threshold
if (over > thres) {
over = thres;
adjusted = true;
}
// Underrun must be less then 2 * threshold
unsigned int doubleThres = 2 * thres;
if (under >= doubleThres) {
under = doubleThres - 10;
adjusted = true;
}
if (tr) {
tr->m_adjustTsOutThreshold = thres;
tr->m_adjustTsOutOverrun = over;
tr->m_adjustTsOutUnderrun = under;
Debug(this,DebugAll,
"Transaction(%u,%u) adjust ts out set to thres=%u over=%u under=%u [%p]",
tr->localCallNo(),tr->remoteCallNo(),thres,over,under,tr);
return;
}
m_adjustTsOutThreshold = thres;
m_adjustTsOutOverrun = over;
m_adjustTsOutUnderrun = under;
if (adjusted)
Debug(this,DebugConf,
"Adjust ts out set to thres=%u over=%u under=%u from thres=%s over=%s under=%s [%p]",
thres,over,under,TelEngine::c_safe(thresS),
TelEngine::c_safe(overS),TelEngine::c_safe(underS),this);
else
Debug(this,DebugAll,"Adjust ts out set to thres=%u over=%u under=%u [%p]",
thres,over,under,this);
}
// (Re)Initialize the engine
void IAXEngine::initialize(const NamedList& params)
{
m_callToken = params.getBoolValue("calltoken_in");
m_callTokenAge = params.getIntValue("calltoken_age",10,1,25);
m_showCallTokenFailures = params.getBoolValue("calltoken_printfailure");
m_rejectMissingCallToken = params.getBoolValue("calltoken_rejectmissing",true);
m_printMsg = params.getBoolValue("printmsg",true);
m_callerNumType = lookup(params["numtype"],IAXInfoElement::s_typeOfNumber);
m_callingPres = lookup(params["presentation"],IAXInfoElement::s_presentation) |
lookup(params["screening"],IAXInfoElement::s_screening);
m_challengeTout = params.getIntValue("challenge_timeout",
IAX2_CHALLENGETOUT_DEF,IAX2_CHALLENGETOUT_MIN);
initOutDataAdjust(params);
IAXTrunkInfo* ti = new IAXTrunkInfo;
ti->initTrunking(params,"trunk_");
ti->init(params);
Lock lck(m_trunkInfoMutex);
m_trunkInfoDef = ti;
#ifdef XDEBUG
String tiS;
m_trunkInfoDef->dump(tiS,"\r\n");
Debug(this,DebugAll,"Initialized trunk info defaults: [%p]\r\n-----\r\n%s\r\n-----",
this,tiS.c_str());
#endif
TelEngine::destruct(ti);
}
void IAXEngine::readSocket(SocketAddr& addr)
{
unsigned char buf[1500];
while (1) {
if (Thread::check(false))
break;
int len = m_socket.recvFrom(buf,sizeof(buf),addr);
if (len == Socket::socketError()) {
if (!m_socket.canRetry()) {
String tmp;
Thread::errorString(tmp,m_socket.error());
Debug(this,DebugWarn,"Socket read error: %s (%d) [%p]",
tmp.c_str(),m_socket.error(),this);
}
Thread::idle(false);
continue;
}
addFrame(addr,buf,len);
}
}
bool IAXEngine::writeSocket(const void* buf, int len, const SocketAddr& addr,
IAXFullFrame* frame, unsigned int* sent)
{
if (m_printMsg && frame && debugAt(DebugInfo)) {
String s;
SocketAddr local;
m_socket.getSockName(local);
frame->toString(s,local,addr,false);
Debug(this,DebugInfo,"Sending frame [%p]%s",this,s.c_str());
}
len = m_socket.sendTo(buf,len,addr);
if (len == Socket::socketError()) {
if (!m_socket.canRetry()) {
String tmp;
Thread::errorString(tmp,m_socket.error());
Alarm(this,"socket",DebugWarn,"Socket write error: %s (%d) [%p]",
tmp.c_str(),m_socket.error(),this);
}
#ifdef DEBUG
else {
String tmp;
Thread::errorString(tmp,m_socket.error());
Debug(this,DebugMild,"Socket temporary unavailable: %s (%d) [%p]",
tmp.c_str(),m_socket.error(),this);
}
#endif
return false;
}
if (sent)
*sent = (unsigned int)len;
return true;
}
void IAXEngine::runGetEvents()
{
while (1) {
if (Thread::check(false))
break;
if (!process())
Thread::idle(false);
}
}
void IAXEngine::removeTransaction(IAXTransaction* transaction)
{
if (!transaction)
return;
Lock lock(this);
releaseCallNo(transaction->localCallNo());
if (!m_incompleteTransList.remove(transaction,false)) {
if (m_transList[transaction->remoteCallNo() % m_transListCount]->remove(transaction,false)) {
DDebug(this,DebugAll,"Transaction(%u,%u) removed [%p]",
transaction->localCallNo(),transaction->remoteCallNo(),this);
}
else {
DDebug(this,DebugAll,
"Trying to remove transaction(%u,%u) but does not exist [%p]",
transaction->localCallNo(),transaction->remoteCallNo(),this);
}
}
else {
DDebug(this,DebugAll,"Transaction(%u,%u) (incomplete outgoing) removed [%p]",
transaction->localCallNo(),transaction->remoteCallNo(),this);
}
}
// Check if there are any transactions in the engine
bool IAXEngine::haveTransactions()
{
Lock lock(this);
// Incomplete transactions
if (m_incompleteTransList.skipNull())
return true;
// Complete transactions
for (int i = 0; i < m_transListCount; i++)
if (m_transList[i]->skipNull())
return true;
return false;
}
u_int32_t IAXEngine::transactionCount()
{
u_int32_t n = 0;
Lock lock(this);
// Incomplete transactions
n += m_incompleteTransList.count();
// Complete transactions
for (int i = 0; i < m_transListCount; i++)
n += m_transList[i]->count();
return n;
}
void IAXEngine::keepAlive(const SocketAddr& addr)
{
#if 0
unsigned char buf[12] = {0x80,0,0,0,0,0,0,0,0,0,IAXFrame::IAX,IAXControl::Inval};
writeSocket(buf,sizeof(buf),addr);
#endif
IAXFullFrame* f = new IAXFullFrame(IAXFrame::IAX,IAXControl::Inval,0,0,0,0,0);
writeSocket(f->data().data(),f->data().length(),addr,f);
f->deref();
}
// Decode a DATETIME value
void IAXEngine::decodeDateTime(u_int32_t dt, unsigned int& year, unsigned int& month,
unsigned int& day, unsigned int& hour, unsigned int& minute, unsigned int& sec)
{
// RFC 5456 Section 8.6.28
year = 2000 + ((dt & 0xfe000000) >> 25);
month = (dt & 0x1e00000) >> 21;
day = (dt & 0x1f0000) >> 16;
hour = (dt & 0xf800) >> 11;
minute = (dt & 0x7e0) >> 5;
sec = dt & 0x1f;
}
// Calculate overall timeout from interval and retransmission counter
unsigned int IAXEngine::overallTout(unsigned int interval, unsigned int nRetrans)
{
unsigned int tmp = interval;
for (unsigned int i = 1; i <= nRetrans; i++)
tmp += interval * (1 << i);
return tmp;
}
bool IAXEngine::processTrunkFrames(const Time& time)
{
Lock lck(m_mutexTrunk);
bool sent = false;
for (ObjList* l = m_trunkList.skipNull(); l;) {
if (Thread::check(false))
break;
IAXMetaTrunkFrame* frame = static_cast<IAXMetaTrunkFrame*>(l->get());
if (frame->refcount() != 1) {
l = l->skipNext();
if (frame->timerTick(time))
sent = true;
continue;
}
Debug(this,DebugAll,
"Removing trunk frame (%p) '%s:%d' timestamps=%s maxlen=%u interval=%ums [%p]",
frame,frame->addr().host().c_str(),frame->addr().port(),
String::boolText(frame->trunkTimestamps()),frame->maxLen(),
frame->sendInterval(),this);
l->remove();
l = l->skipNull();
}
return sent;
}
void IAXEngine::processEvent(IAXEvent* event)
{
XDebug(this,DebugAll,"Default processing - deleting event %p Subclass %u [%p]",
event,event->subclass(),this);
delete event;
}
IAXEvent* IAXEngine::getEvent(const Time& now)
{
IAXTransaction* tr;
IAXEvent* ev;
ObjList* l;
lock();
// Find for incomplete transactions
l = m_incompleteTransList.skipNull();
for (; l; l = l->next()) {
if (Thread::check(false))
break;
tr = static_cast<IAXTransaction*>(l->get());
if (tr && 0 != (ev = tr->getEvent(now))) {
unlock();
return ev;
}
}
// Find for complete transactions, start with current index
while (m_lastGetEvIndex < m_transListCount) {
if (Thread::check(false))
break;
l = m_transList[m_lastGetEvIndex++]->skipNull();
if (!l)
continue;
ListIterator iter(*l);
for (;;) {
tr = static_cast<IAXTransaction*>(iter.get());
// end of iteration?
if (!tr)
break;
RefPointer<IAXTransaction> t = tr;
// dead pointer?
if (!t)
continue;
unlock();
if (0 != (ev = t->getEvent(now)))
return ev;
lock();
}
}
m_lastGetEvIndex = 0;
unlock();
return 0;
}
//TODO: Optimize generateCallNo & releaseCallNo
u_int16_t IAXEngine::generateCallNo()
{
u_int16_t i;
m_startLocalCallNo++;
if (m_startLocalCallNo > IAX2_MAX_CALLNO)
m_startLocalCallNo = IAX2_MIN_CALLNO;
for (i = m_startLocalCallNo; i <= IAX2_MAX_CALLNO; i++)
if (!m_lUsedCallNo[i]) {
m_lUsedCallNo[i] = true;
return i;
}
for (i = IAX2_MIN_CALLNO; i < m_startLocalCallNo; i++)
if (!m_lUsedCallNo[i]) {
m_lUsedCallNo[i] = true;
return i;
}
Debug(this,DebugWarn,"Unable to generate call number. Transaction count: %u [%p]",
transactionCount(),this);
return 0;
}
void IAXEngine::releaseCallNo(u_int16_t lcallno)
{
m_lUsedCallNo[lcallno] = false;
}
IAXTransaction* IAXEngine::startLocalTransaction(IAXTransaction::Type type,
const SocketAddr& addr, IAXIEList& ieList, bool refTrans, bool startTrans)
{
Lock lck(this);
if (exiting())
return 0;
u_int16_t lcn = generateCallNo();
if (!lcn)
return 0;
IAXTransaction* tr = IAXTransaction::factoryOut(this,type,lcn,addr,ieList);
if (tr) {
if (!refTrans || tr->ref()) {
m_incompleteTransList.append(tr);
if (startTrans)
tr->start();
}
else
TelEngine::destruct(tr);
}
if (!tr)
releaseCallNo(lcn);
return tr;
}
// Bind the socket. Terminate it before trying
bool IAXEngine::bind(const char* iface, int port, bool force)
{
if (m_socket.valid())
m_socket.terminate();
m_addr.clear();
if (!m_socket.create(AF_INET,SOCK_DGRAM)) {
String tmp;
Thread::errorString(tmp,m_socket.error());
Alarm(this,"socket",DebugWarn,"Failed to create socket. %d: '%s' [%p]",
m_socket.error(),tmp.c_str(),this);
return false;
}
if (!m_socket.setBlocking(false)) {
String tmp;
Thread::errorString(tmp,m_socket.error());
Alarm(this,"socket",DebugWarn,
"Failed to set socket non blocking operation mode. %d: '%s' [%p]",
m_socket.error(),tmp.c_str(),this);
m_socket.terminate();
return false;
}
SocketAddr addr(AF_INET);
addr.host(iface);
addr.port(port ? port : 4569);
bool ok = m_socket.bind(addr);
if (!ok) {
String tmp;
Thread::errorString(tmp,m_socket.error());
Alarm(this,"socket",DebugWarn,"Failed to bind socket on '%s:%d'%s. %d: '%s' [%p]",
c_safe(iface),port,force ? " - trying a random port" : "",
m_socket.error(),tmp.c_str(),this);
if (force) {
addr.port(0);
ok = m_socket.bind(addr);
if (!ok)
Alarm(this,"socket",DebugWarn,"Failed to bind on any port for iface='%s' [%p]",
iface,this);
else {
ok = m_socket.getSockName(addr);
if (!ok)
Debug(this,DebugWarn,"Failed to retrieve bound address [%p]",this);
}
}
}
if (!ok) {
m_socket.terminate();
return false;
}
m_addr = addr;
if (!m_addr.host())
m_addr.host("0.0.0.0");
String s;
if (addr.host() != iface && !TelEngine::null(iface))
s << " (" << iface << ")";
Debug(this,DebugInfo,"Bound on '%s:%d'%s [%p]",
m_addr.host().c_str(),m_addr.port(),s.safe(),this);
return true;
}
// Check call token on incoming call requests.
bool IAXEngine::checkCallToken(const SocketAddr& addr, IAXFullFrame& frame)
{
XDebug(this,DebugAll,"IAXEngine::checkCallToken('%s:%d') calltoken=%u [%p]",
addr.host().c_str(),addr.port(),m_callToken,this);
if (!m_callToken)
return true;
frame.updateIEList(true);
IAXIEList* list = frame.ieList();
IAXInfoElementBinary* ct = 0;
if (list)
ct = static_cast<IAXInfoElementBinary*>(list->getIE(IAXInfoElement::CALLTOKEN));
// No call token support
if (!ct) {
if (m_showCallTokenFailures)
Debug(this,DebugNote,
"Missing required %s parameter in call request %u from '%s:%d' [%p]",
IAXInfoElement::ieText(IAXInfoElement::CALLTOKEN),frame.sourceCallNo(),
addr.host().c_str(),addr.port(),this);
if (m_rejectMissingCallToken) {
IAXIEList* ies = new IAXIEList;
ies->appendString(IAXInfoElement::CAUSE,"CALLTOKEN support required");
IAXFullFrame* rsp = new IAXFullFrame(IAXFrame::IAX,IAXControl::Reject,
IAX2_CALLTOKEN_REJ_CALLNO,frame.sourceCallNo(),0,1,2,
ies,maxFullFrameDataLen());
writeSocket(addr,rsp);
TelEngine::destruct(rsp);
}
return false;
}
// Request with call token
if (ct->data().length()) {
String tmp((char*)ct->data().data(),ct->data().length());
int age = addrSecretAge(tmp,m_callTokenSecret,addr);
XDebug(this,DebugAll,"Call request %u from '%s:%d' with call token age=%d [%p]",
frame.sourceCallNo(),addr.host().c_str(),addr.port(),age,this);
if (age >= 0 && age <= m_callTokenAge)
return true;
if (m_showCallTokenFailures)
Debug(this,DebugNote,
"Ignoring call request %u from '%s:%d' with %s call token age=%d [%p]",
frame.sourceCallNo(),addr.host().c_str(),addr.port(),
(age > 0) ? "old" : "invalid",age,this);
return false;
}
// Request with empty call token: send one
String tmp;
buildAddrSecret(tmp,m_callTokenSecret,addr);
IAXIEList* ies = new IAXIEList;
ies->appendBinary(IAXInfoElement::CALLTOKEN,(unsigned char*)tmp.c_str(),tmp.length());
IAXFullFrame* rsp = new IAXFullFrame(IAXFrame::IAX,IAXControl::CallToken,
IAX2_CALLTOKEN_CALLNO,frame.sourceCallNo(),0,1,1,ies,maxFullFrameDataLen());
writeSocket(addr,rsp);
TelEngine::destruct(rsp);
return false;
}
bool IAXEngine::acceptFormatAndCapability(IAXTransaction* trans, unsigned int* caps, int type)
{
if (!trans)
return false;
u_int32_t transCapsNonType = IAXFormat::clear(trans->m_capability,type);
IAXFormat* fmt = trans->getFormat(type);
if (!fmt) {
DDebug(this,DebugStub,"acceptFormatAndCapability() No media %s in transaction [%p]",
IAXFormat::typeName(type),this);
trans->m_capability = transCapsNonType;
return false;
}
u_int32_t transCapsType = IAXFormat::mask(trans->m_capability,type);
u_int32_t capability = transCapsType & m_capability;
if (caps)
capability &= IAXFormat::mask(*caps,type);
trans->m_capability = transCapsNonType | capability;
XDebug(this,DebugAll,
"acceptFormatAndCapability trans(%u,%u) type=%s caps(trans/our/param/result)=%u/%u/%u/%u [%p]",
trans->localCallNo(),trans->remoteCallNo(),
fmt->typeName(),transCapsType,IAXFormat::mask(m_capability,type),
caps ? IAXFormat::mask(*caps,type) : 0,capability,this);
// Valid capability ?
if (!capability) {
// Warn if we should have media
if (type == IAXFormat::Audio || 0 != (trans->outgoing() ? fmt->in() : fmt->out()))
Debug(this,DebugNote,"Transaction(%u,%u) no common format(s) for media '%s' [%p]",
trans->localCallNo(),trans->remoteCallNo(),fmt->typeName(),trans);
// capability is 0, use it to set format
if (trans->outgoing())
fmt->set(&capability,&capability,0);
else
fmt->set(&capability,0,&capability);
return false;
}
u_int32_t format = fmt->format();
// Received format is valid ?
if (0 == (format & capability)) {
format = (type == IAXFormat::Audio) ? m_format : 0;
format = IAXFormat::pickFormat(capability,format);
}
if (format) {
fmt->set(&format,&format,&format);
Debug(this,DebugAll,"Transaction(%u,%u) set format %u (%s) for media '%s' [%p]",
trans->localCallNo(),trans->remoteCallNo(),format,fmt->formatName(),
fmt->typeName(),trans);
}
else
Debug(this,DebugNote,
"Transaction(%u,%u) failed to choose a common format for media '%s' [%p]",
trans->localCallNo(),trans->remoteCallNo(),fmt->typeName(),trans);
return format != 0;
}
void IAXEngine::defaultEventHandler(IAXEvent* event)
{
DDebug(this,DebugAll,
"defaultEventHandler - Event type: %u. Frame - Type: %u Subclass: %u [%p]",
event->type(),event->frameType(),event->subclass(),this);
IAXTransaction* tr = event->getTransaction();
switch (event->type()) {
case IAXEvent::New:
tr->sendReject("Feature not implemented or unsupported");
break;
default: ;
}
}
// Set the exiting flag
void IAXEngine::setExiting()
{
Lock lck(this);
m_exiting = true;
}
static bool getTrunkingInfo(RefPointer<IAXTrunkInfo>& ti, IAXEngine* engine,
const NamedList* params, const String& prefix, bool out)
{
if (!engine->trunkInfo(ti))
return false;
if (!params)
return true;
IAXTrunkInfo* tmp = new IAXTrunkInfo;
tmp->initTrunking(*params,prefix,ti,out,!out);
ti = tmp;
TelEngine::destruct(tmp);
return true;
}
void IAXEngine::enableTrunking(IAXTransaction* trans, const NamedList* params,
const String& prefix)
{
if (!trans || trans->type() != IAXTransaction::New)
return;
RefPointer<IAXTrunkInfo> ti;
if (getTrunkingInfo(ti,this,params,prefix,true))
enableTrunking(trans,*ti);
ti = 0;
}
// Enable trunking for the given transaction. Allocate a trunk meta frame if needed.
void IAXEngine::enableTrunking(IAXTransaction* trans, IAXTrunkInfo& data)
{
if (!trans || trans->type() != IAXTransaction::New)
return;
Lock lock(m_mutexTrunk);
if (m_trunking >= 0) {
m_trunking++;
if (m_trunking == 1 || 0 == ((m_trunking - 1) % 200))
Debug(this,DebugNote,"Failed to enable trunking: not available [%p]",this);
return;
}
IAXMetaTrunkFrame* frame;
// Already enabled ?
for (ObjList* l = m_trunkList.skipNull(); l; l = l->skipNext()) {
frame = static_cast<IAXMetaTrunkFrame*>(l->get());
if (frame->addr() == trans->remoteAddr()) {
trans->enableTrunking(frame,data.m_efficientUse);
return;
}
}
frame = new IAXMetaTrunkFrame(this,trans->remoteAddr(),data.m_timestamps,
data.m_maxLen,data.m_sendInterval);
if (trans->enableTrunking(frame,data.m_efficientUse)) {
m_trunkList.append(frame);
Debug(this,DebugAll,
"Added trunk frame (%p) '%s:%d' timestamps=%s maxlen=%u interval=%ums [%p]",
frame,frame->addr().host().c_str(),frame->addr().port(),
String::boolText(frame->trunkTimestamps()),frame->maxLen(),
frame->sendInterval(),this);
}
else
TelEngine::destruct(frame);
}
// Init incoming trunking data for a given transaction
void IAXEngine::initTrunkIn(IAXTransaction* trans, const NamedList* params,
const String& prefix)
{
if (!trans)
return;
RefPointer<IAXTrunkInfo> ti;
if (getTrunkingInfo(ti,this,params,prefix,false))
initTrunkIn(trans,*ti);
ti = 0;
}
// Init incoming trunking data for a given transaction
void IAXEngine::initTrunkIn(IAXTransaction* trans, IAXTrunkInfo& data)
{
if (!trans)
return;
trans->m_trunkInSyncUsingTs = data.m_trunkInSyncUsingTs;
trans->m_trunkInTsDiffRestart = data.m_trunkInTsDiffRestart;
#ifdef XDEBUG
String tmp;
data.dump(tmp," ",false,true,false);
Debug(this,DebugAll,"initTrunkIn(%p) callno=%u set %s [%p]",
trans,trans->localCallNo(),tmp.c_str(),this);
#endif
}
void IAXEngine::runProcessTrunkFrames()
{
while (1) {
if (Thread::check(false))
break;
processTrunkFrames();
Thread::msleep(2,false);
}
}
void IAXEngine::getMD5FromChallenge(String& md5data, const String& challenge, const String& password)
{
MD5 md5;
md5 << challenge << password;
md5data = md5.hexDigest();
}
bool IAXEngine::isMD5ChallengeCorrect(const String& md5data, const String& challenge, const String& password)
{
MD5 md5;
md5 << challenge << password;
return md5data == md5.hexDigest();
}
// Build a time signed secret used to authenticate an IP address
void IAXEngine::buildAddrSecret(String& buf, const String& secret, const SocketAddr& addr)
{
unsigned int t = Time::secNow();
buildSecretDigest(buf,secret,t,addr);
buf << "." << t;
}
// Decode a secret built using buildAddrSecret()
int IAXEngine::addrSecretAge(const String& buf, const String& secret, const SocketAddr& addr)
{
int pos = buf.find('.');
if (pos < 1)
return -1;
int t = buf.substr(pos + 1).toInteger();
String tmp;
buildSecretDigest(tmp,secret,t,addr);
return (tmp == buf.substr(0,pos)) ? ((int)Time::secNow() - t) : -1;
}
/*
* IAXEvent
*/
IAXEvent::IAXEvent(Type type, bool local, bool final, IAXTransaction* transaction, u_int8_t frameType, u_int32_t subclass)
: m_type(type), m_frameType(frameType), m_subClass(subclass),
m_local(local), m_final(final), m_transaction(0), m_ieList(0)
{
if (transaction && transaction->ref())
m_transaction = transaction;
m_ieList = new IAXIEList;
}
IAXEvent::IAXEvent(Type type, bool local, bool final, IAXTransaction* transaction, IAXFullFrame* frame)
: m_type(type), m_frameType(0), m_subClass(0), m_local(local),
m_final(final), m_transaction(0), m_ieList(0)
{
if (transaction && transaction->ref())
m_transaction = transaction;
if (frame) {
m_frameType = frame->type();
m_subClass = frame->subclass();
frame->updateIEList(true);
m_ieList = frame->removeIEList(false);
}
if (!m_ieList)
m_ieList = new IAXIEList;
}
IAXEvent::~IAXEvent()
{
if (m_final && m_transaction && m_transaction->state() == IAXTransaction::Terminated)
m_transaction->getEngine()->removeTransaction(m_transaction);
if (m_transaction) {
m_transaction->eventTerminated(this);
m_transaction->deref();
}
if (m_ieList)
delete m_ieList;
}
/* vi: set ts=8 sw=4 sts=4 noet: */
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