CAIPList.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"
#ifndef ONLY_LOCAL_PROXY
#include "CAIPList.hpp"
#include "CAMsg.hpp"
#include "CAUtil.hpp"
#include "CACmdLnOptions.hpp"


CAIPList::CAIPList()
  { 
    m_pMutex=new CAMutex();
    m_HashTable=new PIPLIST[0x10000];
    memset((void*)m_HashTable,0,0x10000*sizeof(PIPLIST));
    m_allowedConnections=MAX_IP_CONNECTIONS;
#if defined (_DEBUG)
    m_Random=new UINT8[56];
    getRandom(m_Random,56);
#endif
  }

CAIPList::CAIPList(UINT32 allowedConnections)
  {
    m_pMutex=new CAMutex();
    m_HashTable=new PIPLIST[0x10000];
    memset((void*)m_HashTable,0,0x10000*sizeof(PIPLIST));
    m_allowedConnections=allowedConnections;
#if defined (_DEBUG)
    m_Random=new UINT8[56];
    getRandom(m_Random,56);
#endif
  }

CAIPList::~CAIPList()
  {
    for(UINT32 i=0;i<=0xFFFF;i++)
      {
        VOLATILE_PIPLIST entry=m_HashTable[i];
        PIPLIST tmpEntry;
        while(entry!=NULL)
          { 
            tmpEntry=entry;
            entry=entry->next;
            delete tmpEntry;
            tmpEntry = NULL;
          }
      }
#ifdef _DEUBG
    delete[] m_Random;
    m_Random = NULL;
#endif
    delete[] m_HashTable;
    m_HashTable = NULL;
    delete m_pMutex;
    m_pMutex = NULL;
  }

SINT32 CAIPList::insertIP(const UINT8 ip[4])
  {
#ifdef PAYMENT
    return E_SUCCESS;
#else     
    UINT16 hashvalue=(ip[2]<<8)|ip[3];
    SINT32 ret;
    m_pMutex->lock();
    PIPLIST entry=m_HashTable[hashvalue];
    if(entry==NULL)
      {//Hashkey nicht in der Hashtabelle gefunden --> neuer Eintrag in Hashtabelle
#ifndef PSEUDO_LOG
#ifdef _DEBUG
        UINT8 hash[16];
        memcpy(m_Random,ip,4);
        MD5(m_Random,56,hash);
        CAMsg::printMsg(LOG_DEBUG,"Inserting new IP-Address: %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X !\n",hash[0],hash[1],hash[2],hash[3],hash[4],hash[5],hash[6],hash[7],hash[8],hash[9],hash[10],hash[11],hash[12],hash[13],hash[14],hash[15]);
#endif
#else
        CAMsg::printMsg(LOG_DEBUG,"Inserting new IP-Address: {%u.%u.%u.%u} !\n",ip[0],ip[1],ip[2],ip[3]);
#endif
        entry=new IPLISTENTRY;
        memcpy(entry->ip,ip,2);
        entry->count=1;
        entry->next=NULL;
        m_HashTable[hashvalue]=entry;
        ret = entry->count;
#ifdef DEBUG
#ifndef PSEUDO_LOG
#ifdef DEBUG
        CAMsg::printMsg(LOG_DEBUG,"New IP-Address inserted: %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X !\n",hash[0],hash[1],hash[2],hash[3],hash[4],hash[5],hash[6],hash[7],hash[8],hash[9],hash[10],hash[11],hash[12],hash[13],hash[14],hash[15]);
#endif
#else
        CAMsg::printMsg(LOG_DEBUG,"New IP-Address inserted: {%u.%u.%u.%u} !\n",ip[0],ip[1],ip[2],ip[3]);
#endif
#endif
        m_pMutex->unlock();
        return ret;
      }
    else
      {//Hashkey in Hashtabelle gefunden --> suche in Ueberlaufliste nach Eintrag bzw. lege neuen Eitnrag an
        PIPLIST last;
        do
          {
            if(memcmp(entry->ip,ip,2)==0) //we have found the entry
              {
                #ifdef PSEUDO_LOG
                  CAMsg::printMsg(LOG_DEBUG,"Inserting IP-Address: {%u.%u.%u.%u} !\n",ip[0],ip[1],ip[2],ip[3]);
                #endif
                if(entry->count>=m_allowedConnections) //an Attack...
                  {
                    //#if !defined(PSEUDO_LOG)&&defined(FIREWALL_SUPPORT)
                      CAMsg::printMsg(LOG_CRIT,"Possible flooding attack from: %u.%u.x.x !\n",ip[0],ip[1],ip[2],ip[3]);
                    //#endif
                    m_pMutex->unlock();
                    return E_UNKNOWN;
                  }
                entry->count++;
                ret = entry->count;
                #ifdef PSEUDO_LOG
                  CAMsg::printMsg(LOG_DEBUG,"IP-Address inserted: {%u.%u.%u.%u} !\n",ip[0],ip[1],ip[2],ip[3]);
                #endif
                m_pMutex->unlock();
                return ret;
              }
            last=entry;
            entry=entry->next;
          } while(entry!=NULL);
//Nicht in der Ueberlaufliste gefunden
        last->next=new IPLISTENTRY;
        entry=last->next;
        memcpy(entry->ip,ip,2);
        entry->count=1;
        entry->next=NULL;
        ret = entry->count;
        m_pMutex->unlock();
        return ret;
      } 
#endif      
  }

  SINT32 CAIPList::removeIP(const UINT8 ip[4])
  { 
#ifdef PAYMENT  
  return E_SUCCESS;
#else
    UINT16 hashvalue=(ip[2]<<8)|ip[3];
    SINT32 ret;
    m_pMutex->lock();
    PIPLIST entry=m_HashTable[hashvalue];
    if(entry==NULL)
      {
        m_pMutex->unlock();
        CAMsg::printMsg(LOG_INFO,"Try to remove IP which is not in the hashtable of the IP-list - possible inconsistences in IPList!\n");
        return 0;
      }
    else
      {
        PIPLIST before=NULL;
        while(entry!=NULL)
        {
          if(memcmp(entry->ip,ip,2)==0)
          {
            entry->count--;
            if(entry->count==0)
            {           
              #ifndef PSEUDO_LOG
                #if defined (_DEBUG)
                  UINT8 hash[16];
                  memcpy(m_Random,ip,4);
                  MD5(m_Random,56,hash);
                  CAMsg::printMsg(LOG_DEBUG,"Removing IP-Address: %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X !\n",hash[0],hash[1],hash[2],hash[3],hash[4],hash[5],hash[6],hash[7],hash[8],hash[9],hash[10],hash[11],hash[12],hash[13],hash[14],hash[15]);
                #endif
              #else
                CAMsg::printMsg(LOG_DEBUG,"Removing IP-Address: {%u.%u.%u.%u} !\n",ip[0],ip[1],ip[2],ip[3]);
              #endif
              if(before==NULL)
                m_HashTable[hashvalue]=entry->next;
              else
                before->next=entry->next;
              delete entry;
              entry = NULL;
              m_pMutex->unlock();
              return 0;
            }
            ret = entry->count;
            m_pMutex->unlock();
            return ret;
          }
          before=entry;
          entry=entry->next;
        }
        m_pMutex->unlock();
        CAMsg::printMsg(LOG_INFO,"Try to remove IP which is not in list - possible inconsistences in IPList!\n");
        return 0;
      }
#endif      
  }
#endif //ONLY_LOCAL_PROXY