xtunnelschilddata.h

xtunnel nat/fw traversal source code

/*

	File:       XTunnelsChildData.h

	Contains:   X-Tunnels data members only child maintains

	Copyright:  (c) 2003 by Xten Networks, Inc., all rights reserved.

*/

#ifndef XTUNNELSCHILDDATA_H__5DE62CC1_8D5F_49A5_B9EB_BFB20D9F4B41_
#define XTUNNELSCHILDDATA_H__5DE62CC1_8D5F_49A5_B9EB_BFB20D9F4B41_ 1

#include "uiciudp.h"
#include "XTunnelsProtocol.h"

namespace XTunnels {

// for sending (receiving is in each packet) -- specified by echoing last algorithm received from client
extern long sServerPacketEncryption;
extern unsigned long g_ulPacketIndex; // all packets sent and received count, for the new security field

extern unsigned long sQuitReason; 
extern const char* sQuitMessage;

// passed to RunChild(), this can be disabled by SIGALRM
extern int sClientTCPSocket;
// cached by parent's ip allowableness inquiry
extern struct in_addr g_tConnectedClientsIP;

// opened on successful connection for UDP redirection
extern int sClientUDPRedirectSocket;
extern u_buf_t sLastUDPRedirectSource;

// timeout related information
extern unsigned long g_ulChildDeathwatchTimeout; // may be changed by client
extern time_t g_tLastSentToClient;
extern time_t g_tLastReceivedFromClient;

// this must be set before fork() to be valid, otherwise child will disconnect as too busy
extern int sCurrentChildIndex;
extern SChild g_tCurrentChildInfo;


class CXTunnelsChildData
   {
   public:
   
   static CXTunnelsChildData* s_pCurrentChildData;
   static bool                InitializeChildData();
   static void                DestroyChildData() { delete s_pCurrentChildData; s_pCurrentChildData = NULL; }

   CXTunnelsChildData();
   ~CXTunnelsChildData();
   

   // sent from client
   const char* UserID() { return m_szCachedUserID ? m_szCachedUserID : ""; }
   const char* Host() { return m_szCachedHost ? m_szCachedHost : ""; }
   const char* Password() { return m_szCachedPassword ? m_szCachedPassword : ""; }
   bool  IsAnonymous() { return NULL == m_szCachedUserID; }
   bool  SupportsXCipher() { return m_tVersion.m_byProtocolMajor > 0; }
   struct TVersionParam  m_tVersion;
   // cached from account existence and ip allowableness inquiries
   char* m_szCachedUserID;
   char* m_szCachedHost;
   char* m_szCachedPassword;
   void  SetUserID(const char* szUserID);
   void  SetHost(const char* szHost);
   void  SetPassword(const char* szPassword);

   // ardana_robin: szKey is the string version of MD5 or SHA
   // of "otherparty_sessionkey" + ":" + "password"
   unsigned long m_ulKeyEncryptionType; // EAlgorithm_None/EAlgorithm_MD5/EAlgorithm_SHA1
   unsigned long m_ulClientChallengeBlobSize;
   unsigned long m_ulServerChallengeBlobSize;
   char szClientChallengeBlob[ChallengeReplyParam::kMaxChallengeReplyBlobSize];
   char szServerChallengeBlob[ChallengeReplyParam::kMaxChallengeReplyBlobSize];
   char* m_szClientDecryptionKey;
   char* m_szServerEncryptionKey;
   void MakeServerChallengeBlob(unsigned long inUniqueIDSize, char* inUniqueID);
   void MakeClientChallengeBlob(unsigned long inUniqueIDSize, char* inUniqueID);
   void GetClientChallengeBlob(unsigned long& outBlobSize, char* outBlob);
   bool CheckServerChallengeBlob(unsigned long inClientBlobSize, char* inClientBlob);
   void MakeServerEncryptionKey(unsigned long inServerSessionIDSize, char* szServerSessionID);
   void MakeClientDecryptionKey(unsigned long inClientSessionIDSize, char* szClientSessionID);
   
   const char* GetDigestString(char* pDigest, char* szOutString);
   void  MakeDigestWithColonPassword(
      unsigned long ulSessionKeySize,
      char* szSessionKey,
	   unsigned long& ulOutDigestSize,
	   char* pOutDigest
   );
   char* MakeDigestStringWithColonPassword(
      unsigned long ulSessionKeySize,
      char* szSessionKey
   );
   
   int SendPacketToClient(
      TXTunnelsPacket* packet,
      ssize_t inUnencryptedSize, 
      bool bInUseUDPRedirectPort
   );

   void SetAlarm(int iEventType);
   
   };

inline CXTunnelsChildData* ChildData() { return CXTunnelsChildData::s_pCurrentChildData; }

} // end namespace XTunnels

#endif // XTUNNELSCHILDDATA_H__5DE62CC1_8D5F_49A5_B9EB_BFB20D9F4B41_