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src-1.2/external/3rd/library/soePlatform/ChatAPI/utils/UdpLibrary/UdpManager.cpp
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// Copyright 2004 Sony Online Entertainment, all rights reserved.
// Author: Jeff Petersen
#if defined(WIN32)
#define _CRT_SECURE_NO_DEPRECATE // gets rid of deprecation warnings in VS 2005 (don't want to change to secure-versions as it hampers portability)
#endif
#include <assert.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "UdpLibrary.h"
namespace UdpLibrary
{
/////////////////////////////////////////////////////////////////////////////////////////////////////
// UdpManagerHandler default implementation
/////////////////////////////////////////////////////////////////////////////////////////////////////
void UdpManagerHandler::OnConnectRequest(UdpConnection * /*con*/)
{
}
int UdpManagerHandler::OnUserSuppliedEncrypt(UdpConnection * /*con*/, udp_uchar *destData, const udp_uchar *sourceData, int sourceLen)
{
memcpy(destData, sourceData, sourceLen);
return(sourceLen);
}
int UdpManagerHandler::OnUserSuppliedEncrypt2(UdpConnection * /*con*/, udp_uchar *destData, const udp_uchar *sourceData, int sourceLen)
{
memcpy(destData, sourceData, sourceLen);
return(sourceLen);
}
int UdpManagerHandler::OnUserSuppliedDecrypt(UdpConnection * /*con*/, udp_uchar *destData, const udp_uchar *sourceData, int sourceLen)
{
memcpy(destData, sourceData, sourceLen);
return(sourceLen);
}
int UdpManagerHandler::OnUserSuppliedDecrypt2(UdpConnection * /*con*/, udp_uchar *destData, const udp_uchar *sourceData, int sourceLen)
{
memcpy(destData, sourceData, sourceLen);
return(sourceLen);
}
/////////////////////////////////////////////////////////////////////////////////////////////////////
// SimulationParameters implementation
/////////////////////////////////////////////////////////////////////////////////////////////////////
UdpSimulationParameters::UdpSimulationParameters()
{
simulateIncomingByteRate = 0;
simulateIncomingLossPercent = 0.0f;
simulateOutgoingByteRate = 0;
simulateOutgoingLossPercent = 0.0f;
simulateDestinationOverloadLevel = 0;
simulateOutgoingOverloadLevel = 0;
simulateOutgoingLatency = 0;
simulateIncomingLatency = 0;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////
// UdpManager implementation
/////////////////////////////////////////////////////////////////////////////////////////////////////
UdpManager::UdpManager(const UdpParams *params) : mConnectionList(&UdpConnection::mConnectionLink)
, mDisconnectPendingList(&UdpConnection::mDisconnectPendingLink)
, mSimulateIncomingList(&SimulateQueueEntry::mLink)
, mSimulateOutgoingList(&SimulateQueueEntry::mLink)
, mPoolCreatedList(&PooledLogicalPacket::mCreatedLink)
, mPoolAvailableList(&PooledLogicalPacket::mAvailableLink)
, mAvailableEventList(&CallbackEvent::mLink)
, mEventList(&CallbackEvent::mLink)
{
assert(params->clockSyncDelay >= 0); // negative clockSyncDelay is not allowed (makes no sense)
assert(params->crcBytes >= 0 && params->crcBytes <= 4); // crc bytes must be between 0 and 4
assert(params->encryptMethod[0] >= 0 && params->encryptMethod[0] < cEncryptMethodCount); // illegal encryption method specified
assert(params->encryptMethod[1] >= 0 && params->encryptMethod[1] < cEncryptMethodCount); // illegal encryption method specified
assert(params->hashTableSize > 0); // a hash table size greater than zero is required
assert(params->maxRawPacketSize >= 64); // raw packet size must be at least 64 bytes
assert(params->incomingBufferSize >= params->maxRawPacketSize); // incoming socket buffer size must be at least as big as one raw packet
assert(params->keepAliveDelay >= 0); // keep alive delay can't be negative
assert(params->portAliveDelay >= 0); // port alive delay can't be negative
assert(params->maxConnections > 0); // must have at least 1 connection allowed
assert(params->outgoingBufferSize >= params->maxRawPacketSize); // outgoing socket buffer must larger than a raw packet size
assert(params->packetHistoryMax > 0); // packet history must be at least 1
assert(params->port >= 0); // port cannot be negative
assert(params->userSuppliedEncryptExpansionBytes + params->userSuppliedEncryptExpansionBytes2 < params->maxRawPacketSize); // if encryption expansion is larger than raw packet size, we are screwed
assert(params->reliable[0].maxOutstandingBytes >= params->maxRawPacketSize);
assert(params->reliable[1].maxOutstandingBytes >= params->maxRawPacketSize);
assert(params->reliable[2].maxOutstandingBytes >= params->maxRawPacketSize);
assert(params->reliable[3].maxOutstandingBytes >= params->maxRawPacketSize);
assert(params->port != 0 || params->portRange == 0);
mParams = *params;
mParams.maxRawPacketSize = udpMin(mParams.maxRawPacketSize, (int)cHardMaxRawPacketSize);
if (mParams.maxDataHoldSize == -1)
{
mParams.maxDataHoldSize = mParams.maxRawPacketSize;
}
if (mParams.pooledPacketSize == -1)
{
mParams.pooledPacketSize = mParams.maxRawPacketSize;
}
mParams.maxDataHoldSize = udpMin(mParams.maxDataHoldSize, mParams.maxRawPacketSize);
mParams.packetHistoryMax = udpMax(1, mParams.packetHistoryMax);
mPacketHistoryPosition = 0;
mPassThroughData = NULL;
mBackgroundThread = NULL;
if (mParams.udpDriver != NULL)
{
mDriver = mParams.udpDriver;
}
else
{
mDriver = new UdpPlatformDriver();
}
typedef PacketHistoryEntry *PacketHistoryEntryPtr;
mPacketHistory = new PacketHistoryEntryPtr[mParams.packetHistoryMax];
int i;
for (i = 0; i < mParams.packetHistoryMax; i++)
{
mPacketHistory[i] = new PacketHistoryEntry(mParams.maxRawPacketSize);
}
Clock(); // call Clock to initialize mCachedClock
ResetStats();
mRandomSeed = (int)CachedClock();
mLastReceiveTime = 0;
mLastSendTime = 0;
mLastEmptySocketBufferStamp = 0;
mProcessingInducedLag = 0;
mMinimumScheduledStamp = 0;
mInsideGiveTime = false;
mEventListBytes = 0;
for (i = 0; i < mParams.pooledPacketInitial && i < mParams.pooledPacketMax; i++)
{
PooledLogicalPacket *lp = new PooledLogicalPacket(this, mParams.pooledPacketSize);
PoolReturn(lp); // steals our reference
}
mSimulateNextOutgoingTime = 0;
mSimulateNextIncomingTime = 0;
mSimulateOutgoingQueueBytes = 0;
if (mParams.avoidPriorityQueue)
mPriorityQueue = NULL;
else
mPriorityQueue = new PriorityQueue<UdpConnection, UdpClockStamp>(mParams.maxConnections);
mAddressHashTable = new ObjectHashTable<UdpConnection, HashTableMember1<UdpConnection> >(mParams.hashTableSize);
mConnectCodeHashTable = new ObjectHashTable<UdpConnection, HashTableMember2<UdpConnection> >(udpMax(mParams.hashTableSize / 5, 10)); // rarely used, so make it a fraction of the main tables size
if (mParams.portRange == 0)
{
CreateAndBindSocket(mParams.port);
}
else
{
int r = Random() % mParams.portRange;
for (int i = 0; i < mParams.portRange; i++)
{
CreateAndBindSocket(mParams.port + ((r + i) % mParams.portRange));
if (mErrorCondition != cErrorConditionCouldNotBindSocket)
break;
}
}
}
UdpManager::~UdpManager()
{
// Since the background thread holds a reference to the UdpManager while it is running, this should
// not be possible. The only way it could happen is if somebody released the manager who should not have.
assert(mBackgroundThread == NULL);
// next thing we must do is tell all the connections to disconnect (which severs their link to this dying manager)
// this has to be done first since they will call back into us and have themselves removed from our connection-list/priority-queue/etc
// additionally, they may try sending packets to other connections that are not yet disconnected, so we need to make sure that as a
// managed we are in a fully operational state until everybody is disconnected from us.
{
UdpGuard cg(&mConnectionGuard);
UdpConnection *cur = mConnectionList.First();
while (cur != NULL)
{
cur->AddRef();
cur->InternalDisconnect(0, UdpConnection::cDisconnectReasonManagerDeleted); // this will cause it to remove us from the mConnectionList
cur->Release();
// the above call ended up calling us back and removing them from our connection list, so now mConnectionList is pointing to the next entry
cur = mConnectionList.First();
}
}
{
// release any objects that were pending disconnection
UdpGuard guard(&mDisconnectPendingGuard);
mDisconnectPendingList.ReleaseAll();
}
{
// next we need to tell all the pooled packets we have created that they can no longer check themselves back into use
// when they are released
UdpGuard guard(&mPoolGuard);
PooledLogicalPacket *walk = mPoolCreatedList.RemoveHead();
while (walk != NULL)
{
walk->mUdpManager = NULL;
walk = mPoolCreatedList.RemoveHead();
}
// next release the ones we have in our available pool
mPoolAvailableList.ReleaseAll();
}
if (mParams.lingerDelay != 0)
{
mDriver->Sleep(mParams.lingerDelay); // sleep momentarily before closing socket to give it a chance to empty the socket buffer if there is something in it
}
CloseSocket();
if (mParams.udpDriver == NULL)
{
delete mDriver; // we were not given a driver to use, so we must own this driver we have, so destroy it
}
mDriver = NULL;
delete mAddressHashTable;
delete mConnectCodeHashTable;
delete mPriorityQueue;
for (int i = 0; i < mParams.packetHistoryMax; i++)
{
delete mPacketHistory[i];
}
delete[] mPacketHistory;
// delete simulation queues
mSimulateOutgoingList.DeleteAll();
mSimulateIncomingList.DeleteAll();
// delete event queues
mAvailableEventList.DeleteAll();
mEventList.DeleteAll();
}
void UdpManager::GetSimulation(UdpSimulationParameters *simulationParameters) const
{
UdpGuard guard(&mGiveTimeGuard);
*simulationParameters = mSimulation;
}
void UdpManager::SetSimulation(const UdpSimulationParameters *simulationParameters)
{
UdpGuard guard(&mGiveTimeGuard);
mSimulation = *simulationParameters;
}
void UdpManager::CreateAndBindSocket(int usePort)
{
CloseSocket();
mErrorCondition = cErrorConditionNone;
if (!mDriver->SocketOpen(usePort, mParams.incomingBufferSize, mParams.outgoingBufferSize, mParams.bindIpAddress))
{
mErrorCondition = cErrorConditionCouldNotBindSocket;
}
}
void UdpManager::CloseSocket()
{
mDriver->SocketClose();
}
UdpManager::ErrorCondition UdpManager::GetErrorCondition() const
{
return(mErrorCondition);
}
void UdpManager::ProcessDisconnectPending()
{
UdpGuard guard(&mDisconnectPendingGuard);
UdpConnection *entry = mDisconnectPendingList.First();
while (entry != NULL)
{
UdpConnection *next = mDisconnectPendingList.Next(entry);
if (entry->GetStatus() == UdpConnection::cStatusDisconnected)
{
mDisconnectPendingList.Remove(entry);
entry->Release();
}
entry = next;
}
}
void UdpManager::RemoveConnection(UdpConnection *con)
{
assert(con != NULL); // attemped to remove a NULL connection object
// note: it's a bug to Remove a connection object that is already removed...should never be able to happen.
UdpGuard cg(&mConnectionGuard);
if (mPriorityQueue != NULL)
{
mPriorityQueue->Remove(con);
}
mConnectionList.Remove(con);
mAddressHashTable->Remove(con);
mConnectCodeHashTable->Remove(con);
con->Release();
}
void UdpManager::AddConnection(UdpConnection *con)
{
assert(con != NULL); // attemped to add a NULL connection object
UdpGuard cg(&mConnectionGuard);
con->AddRef(); // UdpManager keeps a soft reference to the connection (ie. if it sees it is the only one holding a reference, it releases it)
mConnectionList.InsertHead(con);
mAddressHashTable->Insert(con, AddressHashValue(con->mIp, con->mPort));
mConnectCodeHashTable->Insert(con, con->mConnectCode);
}
void UdpManager::FlushAllMultiBuffer()
{
UdpRef ref(this); // hold reference to ourselves for duration of call (must be before guard object, since guard object references us). In this way, if the application releases us during a callback, we don't disappear until the stack is unwound
mConnectionGuard.Enter();
UdpConnection *cur = mConnectionList.First();
if (cur != NULL)
cur->AddRef();
mConnectionGuard.Leave();
while (cur != NULL)
{
cur->FlushMultiBuffer();
mConnectionGuard.Enter();
UdpConnection *next = mConnectionList.Next(cur);
if (next != NULL)
next->AddRef();
mConnectionGuard.Leave();
cur->Release();
cur = next;
}
}
void UdpManager::DisconnectAll()
{
UdpRef ref(this); // hold reference to ourselves for duration of call (must be before guard object, since guard object references us). In this way, if the application releases us during a callback, we don't disappear until the stack is unwound
mConnectionGuard.Enter();
UdpConnection *cur = mConnectionList.First();
if (cur != NULL)
cur->AddRef();
mConnectionGuard.Leave();
while (cur != NULL)
{
mConnectionGuard.Enter();
UdpConnection *next = mConnectionList.Next(cur);
if (next != NULL)
next->AddRef();
mConnectionGuard.Leave();
cur->Disconnect();
cur->Release();
cur = next;
}
}
void UdpManager::DeliverEvents(int maxProcessingTime)
{
UdpRef ref(this); // hold reference to ourselves for duration of call (must be before guard object, since guard object references us). In this way, if the application releases us during a callback, we don't disappear until the stack is unwound
UdpClockStamp start = Clock();
for (;;)
{
CallbackEvent *ce = EventListPop();
if (ce == NULL)
break;
switch(ce->mEventType)
{
case CallbackEvent::cCallbackEventRoutePacket:
{
ce->mSource->OnRoutePacket((const udp_uchar *)ce->mPayload->GetDataPtr(), ce->mPayload->GetDataLen());
break;
}
case CallbackEvent::cCallbackEventConnectComplete:
{
ce->mSource->OnConnectComplete();
break;
}
case CallbackEvent::cCallbackEventTerminated:
{
ce->mSource->OnTerminated();
break;
}
case CallbackEvent::cCallbackEventCrcReject:
{
ce->mSource->OnCrcReject((const udp_uchar *)ce->mPayload->GetDataPtr(), ce->mPayload->GetDataLen());
break;
}
case CallbackEvent::cCallbackEventPacketCorrupt:
{
ce->mSource->OnPacketCorrupt((const udp_uchar *)ce->mPayload->GetDataPtr(), ce->mPayload->GetDataLen(), ce->mReason);
break;
}
case CallbackEvent::cCallbackEventConnectRequest:
{
{ // guard block
UdpGuard hguard(&mHandlerGuard);
if (mParams.handler != NULL)
{
mParams.handler->OnConnectRequest(ce->mSource);
}
}
if (ce->mSource->GetHandler() == NULL) // if application did not set a handler, then the connection is considered refused
{
ce->mSource->InternalDisconnect(0, UdpConnection::cDisconnectReasonConnectionRefused);
}
break;
}
case CallbackEvent::cCallbackEventNone:
default:
break;
}
ce->ClearEventData();
AvailableEventReturn(ce);
if (ClockElapsed(start) >= maxProcessingTime)
{
UdpGuard sg(&mStatsGuard);
mManagerStats.maxDeliveryTimeExceeded++;
break;
}
}
}
void UdpManager::SetEventQueuing(bool on)
{
UdpGuard guard(&mGiveTimeGuard); // don't allow changing of queuing mode while inside GiveTime from another thread
mParams.eventQueuing = on;
}
bool UdpManager::GetEventQueuing() const
{
UdpGuard guard(&mGiveTimeGuard);
return(mParams.eventQueuing);
}
bool UdpManager::GiveTime(int maxPollingTime, bool giveConnectionsTime)
{
UdpRef ref(this); // hold reference to ourselves for duration of call (must be before guard object, since guard object references us). In this way, if the application releases us during a callback, we don't disappear until the stack is unwound
UdpGuard guard(&mGiveTimeGuard);
Clock(); // update cached clock
if (!mParams.eventQueuing && mEventList.Count() > 0)
{
// if we have events queued and we are not in queuing mode, we must deliver those events
// before we can actually do a give time (this should only happen when the queuing mode is changed on the fly)
DeliverEvents(maxPollingTime);
return(true);
}
//////////////////////////////////////////////
// do the work (prevent re-entry)
//////////////////////////////////////////////
if (mInsideGiveTime)
{
assert(0); // odds are this an application bug, so we want them to see this fairly quickly when it happens
return(false); // prevent re-entrancy of GiveTime function, since that will cause all sorts of problems
}
mInsideGiveTime = true;
// process incoming raw packets from the port
{
UdpGuard sg(&mStatsGuard);
mManagerStats.iterations++;
}
// if we are currently not queuing, yet we have stuff remaining in the queue, then
// we must deliver everything in the queue before we can do more processing of the socket
// note: this would only happen in theory if the queuing mode were being changed on the fly
bool found = false;
if (maxPollingTime != 0)
{
UdpClockStamp start = CachedClock();
for (;;)
{
#ifdef UDPLIBRARY_NO_SIMULATION
PacketHistoryEntry *e = ActualReceive();
#else
PacketHistoryEntry *e = SimulationReceive();
#endif
if (e == NULL)
{
mLastEmptySocketBufferStamp = CachedClock();
break;
}
// if the application takes too long to process packets, or doesn't give the UdpManager frequent enough time via GiveTime
// then it's possible that we will have a clock-sync packet that is sitting in the socket buffer waiting to be processed
// we don't want the applications inability to give us frequent processing time to totally whack up the clock sync stuff
// so we have the clock-sync code ignore clock-sync packets that get stalled in the socket buffer for too long because our
// application is busy processing other packets that were queued before it, or because the application paused for a long
// time before calling GiveTime.
// note: this is intended to prevent cpu induced stalls from causing a sync packet to appear to take longer. For example
// if the player is on a modem, it's possible for the socket-buffer to fill up while the application is stalled and cause the
// the sync-packet to actually get stalled at the terminal buffer on the other end up of the modem. When the application starts
// processing again, it will empty the socket-buffer, but then the get an empty-socket-buffer briefly until the terminal server
// can send the rest of the buffered packets on over. A large client side receive socket buffer may help in this regard.
mProcessingInducedLag = CachedClockElapsed(mLastEmptySocketBufferStamp);
found = true;
ProcessRawPacket(e);
if (ClockElapsed(start) >= maxPollingTime)
{
UdpGuard sg(&mStatsGuard);
mManagerStats.maxPollingTimeExceeded++;
break;
}
}
}
if (giveConnectionsTime)
{
if (mPriorityQueue != NULL)
{
// give time to everybody in the priority-queue that needs it
UdpClockStamp curPriority = CachedClock();
// at the time we start processing the priority queue, we should effectively be taking a snap-shot
// of everybody who needs time, before we give anybody time. Otherwise, it is possible that in the
// process of giving one connection time, another connection could get bumped up the queue to the point
// where it needs time now as well (for example, one connection sending another connection data during the
// give time phase). Although very rare, in theory this could result in an infinite loop situation.
// To solve this, we simply set the earliest time period that somebody can schedule for to 1 ms after
// the current time stamp that we are processing, effectively making it impossible for any connection
// to be given time twice in the same interation of the loop below
mConnectionGuard.Enter();
mMinimumScheduledStamp = curPriority + 1;
mConnectionGuard.Leave();
int processed = 0;
for (;;)
{
UdpConnection *top;
mConnectionGuard.Enter();
top = mPriorityQueue->TopRemove(curPriority);
if (top != NULL)
top->AddRef(); // must always addref connections while inside the connection guard
mConnectionGuard.Leave();
if (top == NULL)
break;
top->GiveTime(true);
top->Release();
processed++;
}
{
UdpGuard sg(&mStatsGuard);
mManagerStats.priorityQueueProcessed += processed;
mManagerStats.priorityQueuePossible += mConnectionList.Count();
}
}
else
{
// give time to everybody
mConnectionGuard.Enter();
UdpConnection *cur = mConnectionList.First();
if (cur != NULL)
cur->AddRef();
mConnectionGuard.Leave();
while (cur != NULL)
{
cur->GiveTime(true);
mConnectionGuard.Enter();
UdpConnection *next = mConnectionList.Next(cur);
if (next != NULL)
next->AddRef();
mConnectionGuard.Leave();
cur->Release();
cur = next;
}
}
ProcessDisconnectPending();
}
{
UdpGuard guard(&mSimulateGuard);
UdpClockStamp curStamp = CachedClock();
SimulateQueueEntry *entry = mSimulateOutgoingList.First();
while (entry != NULL && curStamp >= mSimulateNextOutgoingTime)
{
mSimulateOutgoingList.Remove(entry);
SimulateQueueEntry *next = mSimulateOutgoingList.First();
// simulate a delay before next packet is considered (ie. simple lag)
if (next != NULL)
{
int latencyDelay = (mSimulation.simulateOutgoingLatency - CachedClockElapsed(next->mQueueTime));
mSimulateNextOutgoingTime = curStamp + latencyDelay;
}
// simulate a max data rate
UdpClockStamp nextRateTime = curStamp;
if (mSimulation.simulateOutgoingByteRate > 0)
{
nextRateTime += (entry->mDataLen * 1000 / mSimulation.simulateOutgoingByteRate);
mSimulateNextOutgoingTime = udpMax(mSimulateNextOutgoingTime, nextRateTime);
}
ActualSendHelper(entry->mData, entry->mDataLen, entry->mIp, entry->mPort);
UdpConnection *con = AddressGetConnection(entry->mIp, entry->mPort);
if (con != NULL)
{
con->mSimulateOutgoingQueueBytes -= entry->mDataLen;
con->Release();
}
mSimulateOutgoingQueueBytes -= entry->mDataLen;
delete entry;
entry = next;
}
}
mInsideGiveTime = false;
return(found);
}
UdpConnection *UdpManager::EstablishConnection(const char *serverAddress, int serverPort, int timeout)
{
UdpGuard guard(&mGiveTimeGuard); // probably not needed, I don't see any reason we can't do this while GiveTime is happening in the background...the connection list is protected independently...still, better safe than sorry
assert(serverAddress != NULL);
char useServerAddress[512];
UdpLibrary::UdpMisc::Strncpy(useServerAddress, serverAddress, sizeof(useServerAddress));
char *portPtr = strchr(useServerAddress, ':');
if (portPtr != NULL)
{
*portPtr++ = 0;
serverPort = atoi(portPtr);
}
assert(useServerAddress[0] != 0);
assert(serverPort != 0); // can't connect to no port
if (mConnectionList.Count() >= mParams.maxConnections)
return(NULL);
// get server address
UdpPlatformAddress destIp;
if (!mDriver->GetHostByName(&destIp, useServerAddress))
{
return(NULL); // could not resolve name
}
// first, see if we already have a connection object managing this ip/port, if we do, then fail
UdpConnection *con = AddressGetConnection(destIp, serverPort);
if (con != NULL)
{
con->Release();
return(NULL); // already connected to this address/port
}
return(new UdpConnection(this, destIp, serverPort, timeout));
}
void UdpManager::KeepUntilDisconnected(UdpConnection *con)
{
UdpGuard guard(&mDisconnectPendingGuard);
con->AddRef();
mDisconnectPendingList.InsertTail(con);
}
void UdpManager::GetStats(UdpManagerStatistics *stats)
{
UdpGuard sg(&mStatsGuard);
assert(stats != NULL);
*stats = mManagerStats;
stats->poolAvailable = mPoolAvailableList.Count();
stats->poolCreated = mPoolCreatedList.Count();
{
UdpGuard guard(&mDisconnectPendingGuard);
stats->disconnectPendingCount = mDisconnectPendingList.Count();
}
stats->connectionCount = mConnectionList.Count();
stats->eventListCount = mEventList.Count();
stats->eventListBytes = mEventListBytes;
stats->elapsedTime = CachedClockElapsed(mManagerStatsResetTime);
}
void UdpManager::ResetStats()
{
UdpGuard guard(&mStatsGuard);
mManagerStatsResetTime = CachedClock();
memset(&mManagerStats, 0, sizeof(mManagerStats));
}
void UdpManager::DumpPacketHistory(const char *filename) const
{
UdpGuard guard(&mGiveTimeGuard);
assert(filename != NULL);
assert(filename[0] != 0);
FILE *file = fopen(filename, "wt");
if (file != NULL)
{
// dump history of packets...
for (int i = 0; i < mParams.packetHistoryMax; i++)
{
int pos = (mPacketHistoryPosition + i) % mParams.packetHistoryMax;
if (mPacketHistory[pos]->mLen > 0)
{
char hold[256];
udp_uchar *ptr = mPacketHistory[pos]->mBuffer;
fprintf(file, "%16s,%5d %3d: ", mPacketHistory[pos]->mIp.GetAddress(hold, sizeof(hold)), mPacketHistory[pos]->mPort, mPacketHistory[pos]->mLen);
int len = mPacketHistory[pos]->mLen;
while (len-- > 0)
{
fprintf(file, "%02x ", *ptr);
ptr++;
}
fprintf(file, "\n");
}
}
fclose(file);
}
}
UdpPlatformAddress UdpManager::GetLocalIp() const
{
UdpPlatformAddress ip;
mDriver->SocketGetLocalIp(&ip);
return(ip);
}
int UdpManager::GetLocalPort() const
{
return(mDriver->SocketGetLocalPort());
}
UdpManager::PacketHistoryEntry *UdpManager::SimulationReceive()
{
if (mSimulateIncomingList.Count() == 0 && mSimulation.simulateIncomingLatency == 0)
{
return(ActualReceive());
}
// pull packets from wire and queue them
UdpClockStamp curStamp = CachedClock();
for (;;)
{
PacketHistoryEntry *entry = ActualReceive();
if (entry == NULL)
break;
SimulateQueueEntry *qe = new SimulateQueueEntry(entry->mBuffer, entry->mLen, entry->mIp, entry->mPort, curStamp);
mSimulateIncomingList.InsertTail(qe);
}
SimulateQueueEntry *winner = mSimulateIncomingList.First();
if (winner != NULL && CachedClockElapsed(winner->mQueueTime) >= mSimulation.simulateIncomingLatency)
{
mSimulateIncomingList.Remove(winner);
int pos = mPacketHistoryPosition;
memcpy(mPacketHistory[pos]->mBuffer, winner->mData, winner->mDataLen);
mPacketHistory[pos]->mLen = winner->mDataLen;
mPacketHistory[pos]->mIp = winner->mIp;
mPacketHistory[pos]->mPort = winner->mPort;
mPacketHistoryPosition = (mPacketHistoryPosition + 1) % mParams.packetHistoryMax;
delete winner;
return(mPacketHistory[pos]);
}
return(NULL);
}
UdpManager::PacketHistoryEntry *UdpManager::ActualReceive()
{
UdpClockStamp curStamp = CachedClock();
if (mSimulation.simulateIncomingByteRate > 0 && curStamp < mSimulateNextIncomingTime)
return(NULL);
UdpPlatformAddress fromAddress;
int fromPort = 0;
for (;;)
{
int pos = mPacketHistoryPosition;
int res = mDriver->SocketReceive((char *)mPacketHistory[pos]->mBuffer, mParams.maxRawPacketSize, &fromAddress, &fromPort);
if (res < 0)
{
break;
}
// found data
// note: this will simulate loss of ICMP errors packets too, since ICMP error packets are return from the driver as inline 0-byte packets
if (mSimulation.simulateIncomingLossPercent > 0.0f && ((Random() % 10000) < (mSimulation.simulateIncomingLossPercent * 100)))
{
continue; // packet, what packet?
}
if (mSimulation.simulateIncomingByteRate > 0)
{
mSimulateNextIncomingTime = curStamp + (res * 1000 / mSimulation.simulateIncomingByteRate);
}
mPacketHistory[pos]->mLen = res;
mPacketHistory[pos]->mIp = fromAddress;
mPacketHistory[pos]->mPort = fromPort;
mPacketHistoryPosition = (mPacketHistoryPosition + 1) % mParams.packetHistoryMax;
{
UdpGuard sg(&mStatsGuard);
mLastReceiveTime = curStamp;
mManagerStats.bytesReceived += res;
mManagerStats.packetsReceived++;
}
return(mPacketHistory[pos]);
}
return(NULL);
}
void UdpManager::ActualSend(const udp_uchar *data, int dataLen, UdpPlatformAddress ip, int port)
{
{
UdpGuard sg(&mStatsGuard);
mLastSendTime = CachedClock();
mManagerStats.bytesSent += dataLen;
mManagerStats.packetsSent++;
}
if (mSimulation.simulateOutgoingByteRate != 0 || mSimulation.simulateOutgoingLatency != 0)
{
UdpGuard guard(&mSimulateGuard);
// simulating outgoing byte-rate, so queue it up for sending later
if (mSimulation.simulateOutgoingOverloadLevel > 0 && mSimulateOutgoingQueueBytes + dataLen > mSimulation.simulateOutgoingOverloadLevel)
return; // no room, packet gets lost
UdpConnection *con = AddressGetConnection(ip, port);
if (con != NULL)
{
if (mSimulation.simulateDestinationOverloadLevel > 0 && con->mSimulateOutgoingQueueBytes + dataLen > mSimulation.simulateDestinationOverloadLevel)
{
con->Release();
return; // no room, packet gets lost
}
con->mSimulateOutgoingQueueBytes += dataLen;
con->Release();
}
mSimulateOutgoingQueueBytes += dataLen;
SimulateQueueEntry *entry = new SimulateQueueEntry(data, dataLen, ip, port, LastSendTime());
mSimulateOutgoingList.InsertTail(entry);
if (mSimulateOutgoingList.Count() == 1)
{
mSimulateNextOutgoingTime = udpMax(LastSendTime() + mSimulation.simulateOutgoingLatency, mSimulateNextOutgoingTime);
}
return;
}
ActualSendHelper(data, dataLen, ip, port);
}
void UdpManager::ActualSendHelper(const udp_uchar *data, int dataLen, UdpPlatformAddress ip, int port)
{
if (mSimulation.simulateOutgoingLossPercent > 0.0f && ((Random() % 10000) < (mSimulation.simulateOutgoingLossPercent * 100)))
return;
if (!mDriver->SocketSend((const char *)data, dataLen, &ip, port))
{
// assume a send error is a socket overflow, which we track only for statistical purposes
UdpGuard sg(&mStatsGuard);
mManagerStats.socketOverflowErrors++;
}
}
void UdpManager::SendPortAlive(UdpPlatformAddress ip, int port)
{
char buf[2];
buf[0] = 0;
buf[1] = UdpConnection::cUdpPacketPortAlive;
mDriver->SocketSendPortAlive(buf, 2, &ip, port);
}
void UdpManager::ProcessRawPacket(const PacketHistoryEntry *e)
{
if (e->mLen == 2 && e->mBuffer[0] == 0 && e->mBuffer[1] == UdpConnection::cUdpPacketPortAlive)
return; // port-alive packets are not supposed to reach the destination machine, but on the odd chance they do, pretend like they never existed
UdpConnection *con = AddressGetConnection(e->mIp, e->mPort);
if (con == NULL)
{
if (e->mLen == 0) // len = 0 = ICMP error
{
// we received an ICMP error packet for an unknown connection, so simply ignore it
// if we attempt to process it, it will send a destination-unreachable packet to the ip/port in question
// and create an infinite ICMP reply loop
return;
}
// packet coming from an unknown ip/port
// if it is a connection request packet, then establish a new connection object to reply to it
// connection establish packet must always be at least 6 bytes long as we must have a version number, no matter how it changes
if (e->mBuffer[0] == 0 && e->mBuffer[1] == UdpConnection::cUdpPacketConnect)
{
if (mConnectionList.Count() >= mParams.maxConnections)
return; // can't handle any more connections, so ignore this request entirely
if (mParams.handler != NULL)
{
UdpConnection *newcon = new UdpConnection(this, e);
CallbackConnectRequest(newcon);
newcon->Release();
}
}
else
{
if (mParams.allowPortRemapping)
{
if (e->mBuffer[0] == 0 && e->mBuffer[1] == UdpConnection::cUdpPacketRequestRemap)
{
// ok, we got a packet from somebody, that we don't know who they are, but, it appears they are asking
// for their address/port to be remapped. If we allow port (and/or address) remapping, then go ahead
// an honor their request if possible
udp_uchar *ptr = e->mBuffer + 2;
int connectCode = UdpMisc::GetValue32(ptr);
ptr += 4;
int encryptCode = UdpMisc::GetValue32(ptr);
UdpConnection *con = ConnectCodeGetConnection(connectCode);
if (con != NULL)
{
if (mParams.allowAddressRemapping || con->mIp == e->mIp)
{
// one final security check to ensure these are really the same connection, compare encryption codes
if (con->mConnectionConfig.encryptCode == encryptCode)
{
// remapping is allowed, remap ourselves to the address of the incoming request
UdpGuard guard(&mConnectionGuard);
mAddressHashTable->Remove(con);
con->mIp = e->mIp;
con->mPort = e->mPort;
mAddressHashTable->Insert(con, AddressHashValue(con->mIp, con->mPort));
con->Release();
return;
}
}
con->Release();
}
}
}
// got a packet from somebody and we don't know who they are and the packet we got was not a connection request
// just in case they are a previous client who thinks they are still connected, we will send them an internal
// packet telling them that we don't know who they are
if (mParams.replyUnreachableConnection)
{
// do not reply back with unreachable if the packet coming in is a terminate or unreachable packet itself
if (e->mBuffer[0] != 0 || (e->mBuffer[0] == 0 && e->mBuffer[1] != UdpConnection::cUdpPacketUnreachableConnection && e->mBuffer[1] != UdpConnection::cUdpPacketTerminate))
{
// since we do not have a connection-object associated with this incoming packet, there is no way we could
// encrypt it or add CRC bytes to it, since we have no idea what the other end of the connection is expecting
// in this regard. As such, the UnreachableConnection packet (like the connect and confirm packets) is one
// of those internal packet types that is designated as not being encrypted or CRC'ed.
unsigned char buf[8];
buf[0] = 0;
buf[1] = UdpConnection::cUdpPacketUnreachableConnection;
ActualSend(buf, 2, e->mIp, e->mPort);
}
}
}
return;
}
con->ProcessRawPacket(e);
con->Release();
}
UdpConnection *UdpManager::AddressGetConnection(UdpPlatformAddress ip, int port) const
{
UdpGuard guard(&mConnectionGuard);
UdpConnection *found = mAddressHashTable->FindFirst(AddressHashValue(ip, port));
while (found != NULL)
{
if (found->mIp == ip && found->mPort == port)
{
found->AddRef();
return(found);
}
found = mAddressHashTable->FindNext(found);
}
return(NULL);
}
UdpConnection *UdpManager::ConnectCodeGetConnection(int connectCode) const
{
UdpGuard guard(&mConnectionGuard);
UdpConnection *found = mConnectCodeHashTable->FindFirst(connectCode);
while (found != NULL)
{
if (found->mConnectCode == connectCode)
{
found->AddRef();
return(found);
}
found = mConnectCodeHashTable->FindNext(found);
}
return(NULL);
}
LogicalPacket *UdpManager::CreatePacket(const void *data, int dataLen, const void *data2, int dataLen2)
{
if (mParams.pooledPacketMax > 0)
{
int totalLen = dataLen + dataLen2;
if (totalLen <= mParams.pooledPacketSize)
{
UdpGuard guard(&mPoolGuard);
PooledLogicalPacket *lp = mPoolAvailableList.RemoveHead();
if (lp == NULL)
{
// create a new pooled packet to fulfil request
lp = new PooledLogicalPacket(this, mParams.pooledPacketSize);
}
lp->SetData(data, dataLen, data2, dataLen2);
return(lp);
}
}
return(UdpMisc::CreateQuickLogicalPacket(data, dataLen, data2, dataLen2));
}
void UdpManager::PoolCreated(PooledLogicalPacket *packet)
{
UdpGuard guard(&mPoolGuard);
mPoolCreatedList.InsertHead(packet);
}
void UdpManager::PoolDestroyed(PooledLogicalPacket *packet)
{
UdpGuard guard(&mPoolGuard);
mPoolCreatedList.Remove(packet);
}
char *UdpManager::GetLocalString(char *buf, int bufLen) const
{
if (bufLen < 22)
return(NULL);
UdpPlatformAddress ip = GetLocalIp();
int port = GetLocalPort();
char hold[256];
sprintf(buf, "%s:%d", ip.GetAddress(hold, sizeof(hold)), port);
return(buf);
}
UdpManager::CallbackEvent *UdpManager::AvailableEventBorrow()
{
UdpGuard guard(&mAvailableEventGuard);
CallbackEvent *ce = mAvailableEventList.RemoveHead();
if (ce == NULL)
{
ce = new CallbackEvent();
}
return(ce);
}
void UdpManager::AvailableEventReturn(CallbackEvent *ce)
{
if (mAvailableEventList.Count() < mParams.callbackEventPoolMax)
{
UdpGuard guard(&mAvailableEventGuard);
mAvailableEventList.InsertHead(ce);
}
else
{
delete ce;
}
}
void UdpManager::EventListAppend(CallbackEvent *ce)
{
UdpGuard guard(&mEventListGuard);
mEventList.InsertTail(ce);
if (ce->mPayload != NULL)
{
mEventListBytes += ce->mPayload->GetDataLen();
}
}
UdpManager::CallbackEvent *UdpManager::EventListPop()
{
UdpGuard guard(&mEventListGuard);
CallbackEvent *event = mEventList.RemoveHead();
if (event != NULL && event->mPayload != NULL)
{
mEventListBytes -= event->mPayload->GetDataLen();
}
return(event);
}
void UdpManager::ThreadStart()
{
UdpGuard guard(&mThreadGuard);
if (mBackgroundThread == NULL)
{
mBackgroundThread = new UdpManagerThread(this, mParams.threadSleepTime);
mBackgroundThread->Start();
}
}
void UdpManager::ThreadStop()
{
UdpGuard guard(&mThreadGuard);
if (mBackgroundThread != NULL)
{
assert(mRefCount > 1); // caller must hold a reference, and thread must hold a reference, so this should be true. If it asserts, it means the caller is using a UdpManager that it does not hold a reference to.
mBackgroundThread->Stop(true);
mBackgroundThread->Release();
mBackgroundThread = NULL;
}
}
void UdpManager::CallbackRoutePacket(UdpConnection *con, const udp_uchar *data, int dataLen)
{
if (mParams.eventQueuing)
{
CallbackEvent *ce = AvailableEventBorrow();
LogicalPacket *packet = CreatePacket(data, dataLen);
ce->SetEventData(CallbackEvent::cCallbackEventRoutePacket, con, packet);
packet->Release();
EventListAppend(ce);
}
else
{
con->OnRoutePacket(data, dataLen);
}
}
void UdpManager::CallbackConnectComplete(UdpConnection *con)
{
if (mParams.eventQueuing)
{
CallbackEvent *ce = AvailableEventBorrow();
ce->SetEventData(CallbackEvent::cCallbackEventConnectComplete, con);
EventListAppend(ce);
}
else
{
con->OnConnectComplete();
}
}
void UdpManager::CallbackTerminated(UdpConnection *con)
{
if (mParams.eventQueuing)
{
CallbackEvent *ce = AvailableEventBorrow();
ce->SetEventData(CallbackEvent::cCallbackEventTerminated, con);
EventListAppend(ce);
}
else
{
con->OnTerminated();
}
}
void UdpManager::CallbackCrcReject(UdpConnection *con, const udp_uchar *data, int dataLen)
{
if (mParams.eventQueuing)
{
CallbackEvent *ce = AvailableEventBorrow();
LogicalPacket *packet = CreatePacket(data, dataLen);
ce->SetEventData(CallbackEvent::cCallbackEventCrcReject, con, packet);
packet->Release();
EventListAppend(ce);
}
else
{
con->OnCrcReject(data, dataLen);
}
}
void UdpManager::CallbackPacketCorrupt(UdpConnection *con, const udp_uchar *data, int dataLen, UdpCorruptionReason reason)
{
if (mParams.eventQueuing)
{
CallbackEvent *ce = AvailableEventBorrow();
LogicalPacket *packet = CreatePacket(data, dataLen);
ce->SetEventData(CallbackEvent::cCallbackEventPacketCorrupt, con, packet);
ce->mReason = reason;
packet->Release();
EventListAppend(ce);
}
else
{
con->OnPacketCorrupt(data, dataLen, reason);
}
}
void UdpManager::CallbackConnectRequest(UdpConnection *con)
{
if (mParams.eventQueuing)
{
CallbackEvent *ce = AvailableEventBorrow();
ce->SetEventData(CallbackEvent::cCallbackEventConnectRequest, con);
EventListAppend(ce);
}
else
{
{ // guard block
UdpGuard hguard(&mHandlerGuard);
if (mParams.handler != NULL)
{
mParams.handler->OnConnectRequest(con);
}
}
if (con->GetHandler() == NULL) // if application did not set a handler, then the connection is considered refused
{
con->InternalDisconnect(0, UdpConnection::cDisconnectReasonConnectionRefused);
}
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////
// CallbackEvent implementation
/////////////////////////////////////////////////////////////////////////////////////////////////////
UdpManager::CallbackEvent::CallbackEvent()
{
mEventType = cCallbackEventNone;
mSource = NULL;
mPayload = NULL;
mReason = cUdpCorruptionReasonNone;
}
UdpManager::CallbackEvent::~CallbackEvent()
{
ClearEventData();
}
void UdpManager::CallbackEvent::SetEventData(CallbackEventType eventType, UdpConnection *con, const LogicalPacket *payload)
{
mEventType = eventType;
mSource = con;
mSource->AddRef();
if (payload != NULL)
{
mPayload = payload;
mPayload->AddRef();
}
}
void UdpManager::CallbackEvent::ClearEventData()
{
if (mSource != NULL)
{
mSource->Release();
mSource = NULL;
}
if (mPayload != NULL)
{
mPayload->Release();
mPayload = NULL;
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////
// PacketHistory implementation
/////////////////////////////////////////////////////////////////////////////////////////////////////
UdpManager::PacketHistoryEntry::PacketHistoryEntry(int maxRawPacketSize)
{
mBuffer = new udp_uchar[maxRawPacketSize];
mPort = 0;
mLen = 0;
}
UdpManager::PacketHistoryEntry::~PacketHistoryEntry()
{
delete[] mBuffer;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// SimulateQueueEntry functions
////////////////////////////////////////////////////////////////////////////////////////////////////
UdpManager::SimulateQueueEntry::SimulateQueueEntry(const udp_uchar *data, int dataLen, UdpPlatformAddress ip, int port, UdpClockStamp queueTime)
{
mData = new udp_uchar[dataLen];
mDataLen = dataLen;
memcpy(mData, data, dataLen);
mIp = ip;
mPort = port;
mQueueTime = queueTime;
}
UdpManager::SimulateQueueEntry::~SimulateQueueEntry()
{
delete[] mData;
}
///////////////////////////////////////////////////////////
// UdpManagerThread
///////////////////////////////////////////////////////////
UdpManagerThread::UdpManagerThread(UdpManager *manager, int sleepTime)
{
mUdpManager = manager;
mUdpManager->AddRef();
mStop = false;
mSleepTime = sleepTime;
}
UdpManagerThread::~UdpManagerThread()
{
Stop(true);
mUdpManager->Release();
}
void UdpManagerThread::Run()
{
while (!mStop)
{
mUdpManager->GiveTime();
mUdpManager->Sleep(mSleepTime);
}
}
void UdpManagerThread::Stop(bool waitUntilStopped)
{
mStop = true;
if (waitUntilStopped)
{
while (IsRunning())
{
mUdpManager->Sleep(10);
}
}
}
} // namespace
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