CALastMixChannelList.cpp

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/*
Copyright (c) 2000, The JAP-Team 
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:
 
  - Redistributions of source code must retain the above copyright notice, 
    this list of conditions and the following disclaimer.
 
  - Redistributions in binary form must reproduce the above copyright notice, 
    this list of conditions and the following disclaimer in the documentation and/or 
    other materials provided with the distribution.
 
  - Neither the name of the University of Technology Dresden, Germany nor the names of its contributors 
    may be used to endorse or promote products derived from this software without specific 
    prior written permission. 
 
  
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS 
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
*/
#include "StdAfx.h"
#if !defined ONLY_LOCAL_PROXY|| defined INCLUDE_LAST_MIX 
#include "CALastMixChannelList.hpp"
#include "CAUtil.hpp"
#include "CALibProxytest.hpp"
 
CALastMixChannelList::CALastMixChannelList()
  {
    m_HashTable=new LP_lmChannelListEntry[HASHTABLE_SIZE];
    memset(m_HashTable,0, HASHTABLE_SIZE*sizeof(LP_lmChannelListEntry));
    m_listSockets=NULL;
    m_listSocketsNext=NULL;
    m_nChannels=0;
#ifdef DELAY_CHANNELS
    m_u32DelayChannelUnlimitTraffic=DELAY_CHANNEL_TRAFFIC;
    m_u32DelayChannelBucketGrow=DELAY_BUCKET_GROW;
    m_u32DelayChannelBucketGrowIntervall=DELAY_BUCKET_GROW_INTERVALL;
    m_pDelayBuckets=new UINT32*[MAX_POLLFD];
    memset(m_pDelayBuckets,0,sizeof(UINT32*)*MAX_POLLFD);
    m_pMutexDelayChannel=new CAMutex();
    m_pThreadDelayBucketsLoop=new CAThread((UINT8*)"Delay Buckets Thread");
    m_bDelayBucketsLoopRun=true;
    m_pThreadDelayBucketsLoop->setMainLoop(lml_loopDelayBuckets);
    m_pThreadDelayBucketsLoop->start(this);
#endif
#ifdef DELAY_CHANNELS_LATENCY
    m_u32DelayChannelLatency=DELAY_CHANNEL_LATENCY;
#endif
#ifdef LOG_CRIME
    m_pMutex=new CAMutex();
#endif
}
 
CALastMixChannelList::~CALastMixChannelList()
  {
#ifdef DELAY_CHANNELS
    m_bDelayBucketsLoopRun=false;
    m_pThreadDelayBucketsLoop->join();
    delete m_pThreadDelayBucketsLoop;
    m_pThreadDelayBucketsLoop = NULL;
    delete m_pMutexDelayChannel;
    m_pMutexDelayChannel = NULL;
    delete []m_pDelayBuckets;
    m_pDelayBuckets = NULL;
#endif
    for(UINT32 i=0;i < HASHTABLE_SIZE; i++)
      {
        lmChannelListEntry* akt=m_HashTable[i];
        lmChannelListEntry* tmp;
        while(akt!=NULL)
          {
            tmp=akt;
            akt=akt->list_Channels.next;
            delete tmp;
            tmp = NULL;
          }
      }
    delete[] m_HashTable;
    m_HashTable = NULL;
#ifdef LOG_CRIME
    delete m_pMutex;
#endif
 
  }
 
SINT32 CALastMixChannelList::add(HCHANNEL id,CASocket* pSocket,
#ifdef WITH_INTEGRITY_CHECK
  CASymCipherGCM* pCipher
#else
  CASymChannelCipher* pCipher
#endif
 
  ,CAQueue* pQueue
#ifdef LOG_CHANNEL
                                  ,UINT64 timecreated,UINT32 trafficInFromUser
#endif
#if defined(DELAY_CHANNELS_LATENCY)
                                  ,UINT64 delaytime
#endif
#ifdef LOG_CRIME
                                  ,bool bIsCrime,bool bLogPayload, time_t timeChannelOpened
#endif
#ifdef ANON_DEBUG_MODE
                                  , bool bDebug
#endif
 
                                  )
  {
    UINT32 hash=id & HASH_MASK;
    lmChannelListEntry* pEntry=m_HashTable[hash];
    lmChannelListEntry* pNewEntry=new lmChannelListEntry;
    pNewEntry->channelIn=id;
    pNewEntry->pCipher=pCipher;
    pNewEntry->pSocket=pSocket;
    pNewEntry->pQueueSend=pQueue;
#if defined (LOG_CHANNEL)
    pNewEntry->timeCreated=timecreated;
#endif
#if defined (DELAY_CHANNELS_LATENCY)
    pNewEntry->timeLatency=delaytime+m_u32DelayChannelLatency;
#endif
#ifdef LOG_CHANNEL
    pNewEntry->trafficInFromUser=trafficInFromUser;
    pNewEntry->packetsDataInFromUser=1;
    pNewEntry->packetsDataOutToUser=0;
    pNewEntry->trafficOutToUser=0;
#endif
#ifdef LOG_CRIME
    pNewEntry->bIsCrime=bIsCrime;
    pNewEntry->bLogPayload=bLogPayload;
    pNewEntry->timeChannelOpened=timeChannelOpened;
#endif
#ifdef ANON_DEBUG_MODE
    pNewEntry->bDebug = bDebug;
#endif
    pNewEntry->sendmeCounterDownstream=0;
    pNewEntry->sendmeCounterUpstream=0;
#ifdef DELAY_CHANNELS
    pNewEntry->delayBucket=m_u32DelayChannelUnlimitTraffic; //can always send some first packets
    for(UINT32 i=0;i<MAX_POLLFD;i++)
      {
        if(m_pDelayBuckets[i]==NULL)
          {
            pNewEntry->delayBucketID=i;
            break;
          }
      }
    m_pDelayBuckets[pNewEntry->delayBucketID]=&pNewEntry->delayBucket;
#endif
    if(pEntry==NULL) //First Entry for Hash in HashTable
      {
        pNewEntry->list_Channels.next=NULL;
        pNewEntry->list_Channels.prev=NULL;
      }
    else //insert in Hashlist for Hashtableentry
      {
        pNewEntry->list_Channels.prev=NULL;
        pNewEntry->list_Channels.next=pEntry;
        pEntry->list_Channels.prev=pNewEntry;
      }
    //Insert in SocketList
#ifdef LOG_CRIME
    m_pMutex->lock();
#endif
    if(m_listSockets==NULL)
      {
        m_listSockets=pNewEntry;
        pNewEntry->list_Sockets.next=NULL;
        pNewEntry->list_Sockets.prev=NULL;
      }
    else
      {
        pNewEntry->list_Sockets.prev=NULL;
        pNewEntry->list_Sockets.next=m_listSockets;
        m_listSockets->list_Sockets.prev=pNewEntry;
        m_listSockets=pNewEntry;        
      }
#ifdef LOG_CRIME
    m_pMutex->unlock();
#endif
    m_HashTable[hash]=pNewEntry;
    //if(m_listSocketsNext==NULL)
    //  m_listSocketsNext=m_listSockets;
    m_nChannels++;
    return E_SUCCESS;
  }
 
SINT32 CALastMixChannelList::removeChannel(HCHANNEL channel)
  {
    UINT32 hash=channel & HASH_MASK;
    lmChannelListEntry* pEntry=m_HashTable[hash];
    while(pEntry!=NULL)
      {
        if(pEntry->channelIn==channel)
          {
            if(m_listSocketsNext==pEntry) //removing next enumeration Element...
              m_listSocketsNext=m_listSocketsNext->list_Sockets.next; //adjusting!
//remove from HashTable
            if(pEntry->list_Channels.prev==NULL)
              m_HashTable[hash]=pEntry->list_Channels.next;
            else
              {
                pEntry->list_Channels.prev->list_Channels.next=pEntry->list_Channels.next;
              }
            if(pEntry->list_Channels.next!=NULL)
              {
                pEntry->list_Channels.next->list_Channels.prev=pEntry->list_Channels.prev;
              }
            //remove from SocketList
#ifdef LOG_CRIME
            m_pMutex->lock();
#endif
            if(pEntry->list_Sockets.prev==NULL)
              m_listSockets=pEntry->list_Sockets.next;
            else
              pEntry->list_Sockets.prev->list_Sockets.next=pEntry->list_Sockets.next;
            if(pEntry->list_Sockets.next!=NULL)
              pEntry->list_Sockets.next->list_Sockets.prev=pEntry->list_Sockets.prev;
            #ifdef DELAY_CHANNELS
              m_pMutexDelayChannel->lock();
              m_pDelayBuckets[pEntry->delayBucketID]=NULL;
              m_pMutexDelayChannel->unlock();
            #endif
#ifdef LOG_CRIME
            if (pEntry->bIsCrime)
              {
                int log=LOG_ENCRYPTED;
                if(!CALibProxytest::getOptions()->isEncryptedLogEnabled())
                  log=LOG_CRIT;
                char buff[255];
                strftime(buff, 255, "%Y/%m/%d-%H:%M:%S", localtime(&pEntry->timeChannelOpened));
                CAMsg::printMsg(log, "Crime channel closed (opened at: %s [unix timestamp: %u]) -- previous mix channel: %u\n", buff,pEntry->timeChannelOpened,pEntry->channelIn);
              }
#endif
 
            delete pEntry;
            pEntry = NULL;
            m_nChannels--;          
#ifdef LOG_CRIME
            m_pMutex->unlock();
#endif
            return E_SUCCESS;
          }
        pEntry=pEntry->list_Channels.next;
      }
    return E_SUCCESS;
  }
 
SINT32 CALastMixChannelList::test()
        {
#if !defined (LOG_CHANNEL)&&!defined(DELAY_CHANNELS_LATENCY)&&!defined(LOG_CRIME)&&!defined(ANON_DEBUG_MODE)
          CALastMixChannelList oList;
          UINT32 c;
          UINT32 rand;
          int i,j;
          for(i=0;i<100;i++)
            {
              getRandom(&c);
              oList.add(c,NULL,NULL,NULL);
 
          }
          for(i=0;i < 10000;i++)
            {
              lmChannelListEntry* akt=oList.getFirstSocket();
              while(akt!=NULL)
                {
                  getRandom(&rand);
                  if(rand<0x7FFFFFFF)
                    {
                      getRandom(&c);
                      oList.add(c,NULL,NULL,NULL);
                    }
                  getRandom(&rand);
                  if(rand<0x7FFFFFFF)
                    oList.removeChannel(akt->channelIn);
                  getRandom(&rand);
                  if(rand<0x0FFFFFFF)
                    for(j=0;j<5;j++)
                      {
                        getRandom(&c);
                        oList.add(c,NULL,NULL,NULL);
                      }
                  getRandom(&rand);
                  if(rand<0x7FFFFFFF)
                    for(j=0;j<10000;j++)
                      {
                        getRandom(&c);
                        oList.removeChannel(c);
                      }
                  akt=oList.getNextSocket();
                }
            }
#endif
          return 0;
        }
 
#ifdef DELAY_CHANNELS
  THREAD_RETURN lml_loopDelayBuckets(void* param)
  {
    CALastMixChannelList* pChannelList=(CALastMixChannelList*)param;
    UINT32** pDelayBuckets=pChannelList->m_pDelayBuckets;
    while(pChannelList->m_bDelayBucketsLoopRun)
      {
        pChannelList->m_pMutexDelayChannel->lock();
        UINT32 u32BucketGrow=pChannelList->m_u32DelayChannelBucketGrow;
        UINT32 u32MaxBucket=u32BucketGrow*10;
        for(UINT32 i=0;i<MAX_POLLFD;i++)
          {
            if(pDelayBuckets[i]!=NULL&&*(pDelayBuckets[i])<u32MaxBucket)
              *(pDelayBuckets[i])+=u32BucketGrow;
          }
        pChannelList->m_pMutexDelayChannel->unlock();   
        msSleep(pChannelList->m_u32DelayChannelBucketGrowIntervall);
      }
    THREAD_RETURN_SUCCESS;
  }
  
  void CALastMixChannelList::reduceDelayBuckets(UINT32 delayBucketID, UINT32 amount)
    {
      m_pMutexDelayChannel->lock();
      if (*(m_pDelayBuckets[delayBucketID]) < amount)
        {
          *(m_pDelayBuckets[delayBucketID]) = 0;
        }
      else
        {
          *(m_pDelayBuckets[delayBucketID]) -= amount;
        }
      m_pMutexDelayChannel->unlock();
    }
  /*
  UINT32 CALastMixChannelList::getDelayBuckets(UINT32 delayBucketID)
  {
    UINT32 ret = 0;
    m_pMutexDelayChannel->lock();
    ret = ( (*(m_pDelayBuckets[delayBucketID])) > 0 ) ? (*(m_pDelayBuckets[delayBucketID])) : 0;
    m_pMutexDelayChannel->unlock();
    return ret;
  }*/
  
  /*bool CALastMixChannelList::hasDelayBuckets(UINT32 delayBucketID)
  {
    bool ret = false;
    m_pMutexDelayChannel->lock();
    //if(delayBucketID < MAX_POLLFD)
    //{
      //if(m_pDelayBuckets[delayBucketID] != NULL)
      //{
        ret = ( (*(m_pDelayBuckets[delayBucketID])) > 0 );
      //}
    //}
    m_pMutexDelayChannel->unlock();
    return ret;
  }*/
  
  void CALastMixChannelList::setDelayParameters(UINT32 unlimitTraffic,UINT32 bucketGrow,UINT32 intervall)
  {
    m_pMutexDelayChannel->lock();
    CAMsg::printMsg(LOG_DEBUG,"CALastMixChannelList - Set new traffic limit per channel- unlimit: %u bucketgrow: %u intervall %u\n",
      unlimitTraffic,bucketGrow,intervall);
    m_u32DelayChannelUnlimitTraffic=unlimitTraffic;
    m_u32DelayChannelBucketGrow=bucketGrow;
    m_u32DelayChannelBucketGrowIntervall=intervall;
    for(UINT32 i=0;i<MAX_POLLFD;i++)
      if(m_pDelayBuckets[i]!=NULL)
        *(m_pDelayBuckets[i])=m_u32DelayChannelUnlimitTraffic;
    m_pMutexDelayChannel->unlock();   
  }                                                       
#endif
 
#ifdef DELAY_CHANNELS_LATENCY
  void CALastMixChannelList::setDelayLatencyParameters(UINT32 latency)
    {
      CAMsg::printMsg(LOG_DEBUG,"CALastMixChannelList - Set new latency: %u ms\n",latency);
      m_u32DelayChannelLatency=latency;
    }
#endif
#endif //ONLY_LOCAL_PROXY