UDPSocketPair* UDPSocketPool::CreateUDPSocketPair(UInt32 inAddr, UInt16 inPort)
{
OSMutexLocker locker(&fMutex);
UDPSocketPair* theElem = ConstructUDPSocketPair();
Assert(theElem != NULL);
if (theElem->fSocketA->Open() != OS_NoErr)
{
this->DestructUDPSocketPair(theElem);
return NULL;
}
if (theElem->fSocketB->Open() != OS_NoErr)
{
this->DestructUDPSocketPair(theElem);
return NULL;
}
// Set socket options on these new sockets
this->SetUDPSocketOptions(theElem);
//try to find an open pair of ports to bind these suckers tooo
Bool16 foundPair = false;
//If port is 0, then the caller doesn't care what port # we bind this socket to.
//Otherwise, ONLY attempt to bind this socket to the specified port
UInt16 startIndex = kLowestUDPPort;
if (inPort != 0)
startIndex = inPort;
UInt16 stopIndex = kHighestUDPPort;
if (inPort != 0)
stopIndex = inPort;
while ((!foundPair) && (startIndex <= kHighestUDPPort))
{
OS_Error theErr = theElem->fSocketA->Bind(inAddr, startIndex);
if (theErr == OS_NoErr)
{
theErr = theElem->fSocketB->Bind(inAddr, startIndex+1);
if (theErr == OS_NoErr)
{
foundPair = true;
fUDPQueue.EnQueue(&theElem->fElem);
theElem->fRefCount++;
return theElem;
}
}
//If we are looking to bind to a specific port set, and we couldn't then
//just break it out here.
if (inPort != 0)
break;
startIndex += 2;
}
//if we couldn't find a pair of sockets, make sure to clean up our mess
this->DestructUDPSocketPair(theElem);
return NULL;
}
UDPSocketPair* UDPSocketPool::CreateUDPSocketPair(UInt32 inAddr, UInt16 inPort)
{
//try to find an open pair of ports to bind these suckers tooo
OSMutexLocker locker(&fMutex);
UDPSocketPair* theElem = NULL;
Bool16 foundPair = false;
UInt16 curPort = kLowestUDPPort;
UInt16 stopPort = kHighestUDPPort -1; // prevent roll over when iterating over port nums
UInt16 socketBPort = kLowestUDPPort + 1;
//If port is 0, then the caller doesn't care what port # we bind this socket to.
//Otherwise, ONLY attempt to bind this socket to the specified port
if (inPort != 0)
curPort = inPort;
if (inPort != 0)
stopPort = inPort;
while ((!foundPair) && (curPort < kHighestUDPPort))
{
socketBPort = curPort +1; // make socket pairs adjacent to one another
theElem = ConstructUDPSocketPair();
Assert(theElem != NULL);
if (theElem->fSocketA->Open() != OS_NoErr)
{
this->DestructUDPSocketPair(theElem);
return NULL;
}
if (theElem->fSocketB->Open() != OS_NoErr)
{
this->DestructUDPSocketPair(theElem);
return NULL;
}
// Set socket options on these new sockets
this->SetUDPSocketOptions(theElem);
OS_Error theErr = theElem->fSocketA->Bind(inAddr, curPort);
if (theErr == OS_NoErr)
{ //qtss_printf("fSocketA->Bind ok on port%u\n", curPort);
theErr = theElem->fSocketB->Bind(inAddr, socketBPort);
if (theErr == OS_NoErr)
{ //qtss_printf("fSocketB->Bind ok on port%u\n", socketBPort);
foundPair = true;
fUDPQueue.EnQueue(&theElem->fElem);
theElem->fRefCount++;
return theElem;
}
//else qtss_printf("fSocketB->Bind failed on port%u\n", socketBPort);
}
//else qtss_printf("fSocketA->Bind failed on port%u\n", curPort);
//If we are looking to bind to a specific port set, and we couldn't then
//just break here.
if (inPort != 0)
break;
if (curPort >= stopPort) //test for stop condition
break;
curPort += 2; //try a higher port pair
this->DestructUDPSocketPair(theElem); //a bind failure
theElem = NULL;
}
//if we couldn't find a pair of sockets, make sure to clean up our mess
if (theElem != NULL)
this->DestructUDPSocketPair(theElem);
return NULL;
}
