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/* $Id: Db.h $ */
/** @file
* DHCP server - address database
*/
/*
* Copyright (C) 2017-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#ifndef VBOX_INCLUDED_SRC_Dhcpd_Db_h
#define VBOX_INCLUDED_SRC_Dhcpd_Db_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/net.h>
#include <iprt/cpp/xml.h>
#include <list>
#include "Defs.h"
#include "TimeStamp.h"
#include "ClientId.h"
#include "IPv4Pool.h"
#include "Config.h"
#include "DhcpMessage.h"
class Binding
{
friend class Db;
public:
enum State { FREE, RELEASED, EXPIRED, OFFERED, ACKED };
private:
const RTNETADDRIPV4 m_addr;
State m_state;
ClientId m_id;
TimeStamp m_issued;
uint32_t m_secLease;
public:
Binding();
Binding(const Binding &);
explicit Binding(RTNETADDRIPV4 addrParam)
: m_addr(addrParam), m_state(FREE),
m_issued(), m_secLease() {}
Binding(RTNETADDRIPV4 addrParam, const ClientId &idParam)
: m_addr(addrParam), m_state(FREE), m_id(idParam),
m_issued(), m_secLease() {}
RTNETADDRIPV4 addr() const { return m_addr; }
State state() const { return m_state; }
const char *stateName() const;
const ClientId &id() const { return m_id; }
uint32_t leaseTime() const { return m_secLease; }
TimeStamp issued() const { return m_issued; }
Binding &setState(State stateParam)
{
m_state = stateParam;
return *this;
}
Binding &setState(const char *pszStateName);
Binding &setLeaseTime(uint32_t secLease)
{
m_issued = TimeStamp::now();
m_secLease = secLease;
return *this;
}
Binding &giveTo(const ClientId &idParam)
{
m_id = idParam;
m_state = FREE;
return *this;
}
void free()
{
m_id = ClientId();
m_state = FREE;
}
bool expire(TimeStamp deadline);
bool expire() { return expire(TimeStamp::now()); }
static Binding *fromXML(const xml::ElementNode *ndLease);
int toXML(xml::ElementNode *ndParent) const;
public:
static void registerFormat(); /* %R[binding] */
private:
static bool g_fFormatRegistered;
static DECLCALLBACK(size_t) rtStrFormat(
PFNRTSTROUTPUT pfnOutput, void *pvArgOutput,
const char *pszType, void const *pvValue,
int cchWidth, int cchPrecision, unsigned fFlags,
void *pvUser);
};
class Db
{
private:
typedef std::list<Binding *> bindings_t;
const Config *m_pConfig;
bindings_t m_bindings;
IPv4Pool m_pool;
public:
Db();
~Db();
int init(const Config *pConfig);
bool addressBelongs(RTNETADDRIPV4 addr) const { return m_pool.contains(addr); }
Binding *allocateBinding(const DhcpClientMessage &req);
bool releaseBinding(const DhcpClientMessage &req);
void cancelOffer(const DhcpClientMessage &req);
void expire();
public:
int loadLeases(const std::string &strFileName);
void loadLease(const xml::ElementNode *ndLease);
int writeLeases(const std::string &strFileName) const;
private:
Binding *createBinding(const ClientId &id = ClientId());
Binding *createBinding(RTNETADDRIPV4 addr, const ClientId &id = ClientId());
Binding *allocateAddress(const ClientId &id, RTNETADDRIPV4 addr);
/* add binding e.g. from the leases file */
int addBinding(Binding *b);
};
#endif /* !VBOX_INCLUDED_SRC_Dhcpd_Db_h */
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