msgqueue.h

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/*_############################################################################
  _## 
  _##  msgqueue.h  
  _##
  _##  SNMP++ v3.4
  _##  -----------------------------------------------
  _##  Copyright (c) 2001-2021 Jochen Katz, Frank Fock
  _##
  _##  This software is based on SNMP++2.6 from Hewlett Packard:
  _##  
  _##    Copyright (c) 1996
  _##    Hewlett-Packard Company
  _##  
  _##  ATTENTION: USE OF THIS SOFTWARE IS SUBJECT TO THE FOLLOWING TERMS.
  _##  Permission to use, copy, modify, distribute and/or sell this software 
  _##  and/or its documentation is hereby granted without fee. User agrees 
  _##  to display the above copyright notice and this license notice in all 
  _##  copies of the software and any documentation of the software. User 
  _##  agrees to assume all liability for the use of the software; 
  _##  Hewlett-Packard, Frank Fock, and Jochen Katz make no representations 
  _##  about the suitability of this software for any purpose. It is provided 
  _##  "AS-IS" without warranty of any kind, either express or implied. User 
  _##  hereby grants a royalty-free license to any and all derivatives based
  _##  upon this software code base. 
  _##  
  _##########################################################################*/
/*===================================================================

  Copyright (c) 1999
  Hewlett-Packard Company

  ATTENTION: USE OF THIS SOFTWARE IS SUBJECT TO THE FOLLOWING TERMS.
  Permission to use, copy, modify, distribute and/or sell this software
  and/or its documentation is hereby granted without fee. User agrees
  to display the above copyright notice and this license notice in all
  copies of the software and any documentation of the software. User
  agrees to assume all liability for the use of the software; Hewlett-Packard
  makes no representations about the suitability of this software for any
  purpose. It is provided "AS-IS without warranty of any kind,either express
  or implied. User hereby grants a royalty-free license to any and all
  derivatives based upon this software code base.

      M S G Q U E U E . H

      CSNMPMessageQueue CLASS DEFINITION

      COPYRIGHT HEWLETT PACKARD COMPANY 1999

      INFORMATION NETWORKS DIVISION

      NETWORK MANAGEMENT SECTION

      DESIGN + AUTHOR:     Tom Murray

      DESCRIPTION:
        Queue for holing SNMP event sources (outstanding snmp messages)

=====================================================================*/
// $Id$

#ifndef _SNMP_MSGQUEUE_H_
#define _SNMP_MSGQUEUE_H_

//----[ includes ]-----------------------------------------------------
#include <libsnmp.h>

#ifndef WIN32
#if !(defined CPU && CPU == PPC603)
#include <sys/time.h>   // time stuff and fd_set
#endif
#endif

//----[ snmp++ includes ]----------------------------------------------
#include "snmp_pp/config_snmp_pp.h"
#include "snmp_pp/address.h"
#include "snmp_pp/target.h"
#include "snmp_pp/pdu.h"
#include "snmp_pp/msec.h"
#include "snmp_pp/uxsnmp.h"
#include "snmp_pp/eventlist.h"

#ifdef SNMP_PP_NAMESPACE
namespace Snmp_pp {
#endif


//----[ CSNMPMessage class ]-------------------------------------------

  /*-----------------------------------------------------------*/
  /* CSNMPMessage                                              */
  /*   a description of a single MIB access operation.         */
  /*-----------------------------------------------------------*/
class DLLOPT CSNMPMessage
{
 public:
  CSNMPMessage(unsigned long id,
               Snmp * snmp,
               SnmpSocket socket,
               const SnmpTarget &target,
               Pdu &pdu,
               unsigned char * rawPdu,
               size_t rawPduLen,
               const Address & address,
               snmp_callback callBack,
               void * callData);
  virtual ~CSNMPMessage();
  void Update(unsigned char *rawPdu, size_t rawPduLen);
  unsigned long GetId() const { return m_uniqueId; };
  void ResetId(const unsigned long newId) { m_uniqueId = newId; };
  void SetSendTime();
  void GetSendTime(msec &sendTime) const { sendTime = m_sendTime; };
  SnmpSocket GetSocket() const { return m_socket; };
  int SetPdu(const int reason, const Pdu &pdu, const UdpAddress &fromaddress);
  int GetPdu(int &reason, Pdu &pdu)
                                 { pdu = m_pdu; reason = m_reason; return 0; };
  int GetReceived() const { return m_received; };
  int ResendMessage();
  int Callback(const int reason);
  SnmpTarget *GetTarget() { return m_target; };
  bool IsLocked() const { return m_locked; };
  void SetLocked(const bool l) { m_locked = l; };

 protected:

  unsigned long   m_uniqueId;
  msec            m_sendTime;
  Snmp *          m_snmp;
  SnmpSocket      m_socket;
  SnmpTarget *    m_target;
  Pdu             m_pdu;
  unsigned char * m_rawPdu;
  size_t          m_rawPduLen;
  Address *       m_address;
  snmp_callback   m_callBack;
  void *          m_callData;
  int             m_reason;
  int             m_received;
  bool            m_locked;
};

  /*-----------------------------------------------------------*/
  /* CSNMPMessageQueue                                         */
  /*   class describing a collection of outstanding SNMP msgs. */
  /*-----------------------------------------------------------*/
class DLLOPT CSNMPMessageQueue: public CEvents
{
 public:
    CSNMPMessageQueue(EventListHolder *holder, Snmp *session);
    virtual ~CSNMPMessageQueue();
    CSNMPMessage *AddEntry(unsigned long id, Snmp *snmp, SnmpSocket socket,
                           const SnmpTarget &target, Pdu &pdu, unsigned char * rawPdu,
                           size_t rawPduLen, const Address & address,
                           snmp_callback callBack, void * callData);
    CSNMPMessage *GetEntry(const unsigned long uniqueId);
    int DeleteEntry(const unsigned long uniqueId);
    void DeleteSocketEntry(const SnmpSocket socket);
  // find the next msg that will timeout
    CSNMPMessage *GetNextTimeoutEntry();
  // find the next timeout
    int GetNextTimeout(msec &sendTime);
#ifdef HAVE_POLL_SYSCALL
    int GetFdCount();
    bool GetFdArray(struct pollfd *readfds, int &remaining);
    int HandleEvents(const struct pollfd *readfds, const int fds);
#else
  // set up parameters for select
    void GetFdSets(int &maxfds, fd_set &readfds, fd_set &writefds,
                  fd_set &exceptfds);
    int HandleEvents(const int maxfds,
                     const fd_set &readfds,
                     const fd_set &writefds,
                     const fd_set &exceptfds);
#endif

  // return number of outstanding messages
    int GetCount() { return m_msgCount; };

    int DoRetries(const msec &sendtime);

    int Done() { return 0; }

    int Done(unsigned long);

 protected:

    /*---------------------------------------------------------*/
    /* CSNMPMessageQueueElt                                    */
    /*   a container for a single item on a linked lists of    */
    /*  CSNMPMessages.                                         */
    /*---------------------------------------------------------*/
    class DLLOPT CSNMPMessageQueueElt
    {
     public:
      CSNMPMessageQueueElt(CSNMPMessage *message,
                           CSNMPMessageQueueElt *next,
                           CSNMPMessageQueueElt *previous);

      ~CSNMPMessageQueueElt();
      CSNMPMessageQueueElt *GetNext() { return m_Next; }
      CSNMPMessage *GetMessage() { return m_message; }
      CSNMPMessage *TestId(const unsigned long uniqueId);

     private:

      CSNMPMessage *m_message;
      class CSNMPMessageQueueElt *m_Next;
      class CSNMPMessageQueueElt *m_previous;
    };

    CSNMPMessageQueueElt m_head;
    int m_msgCount;
    EventListHolder *my_holder;
    Snmp *m_snmpSession;
};

#ifdef SNMP_PP_NAMESPACE
} // end of namespace Snmp_pp
#endif 

#endif // _SNMP_MSGQUEUE_H_