animation-interface.h

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: George F. Riley<riley@ece.gatech.edu>
 * Author: John Abraham <john.abraham@gatech.edu>
 * Contributions: Eugene Kalishenko <ydginster@gmail.com> (Open Source and Linux Laboratory
 * http://dev.osll.ru/)
 */
 
// Interface between ns3 and the network animator
 
#ifndef ANIMATION_INTERFACE__H
#define ANIMATION_INTERFACE__H
 
#include "ns3/config.h"
#include "ns3/ipv4-l3-protocol.h"
#include "ns3/ipv4.h"
#include "ns3/log.h"
#include "ns3/lte-enb-net-device.h"
#include "ns3/lte-ue-net-device.h"
#include "ns3/mac48-address.h"
#include "ns3/net-device.h"
#include "ns3/node-container.h"
#include "ns3/node-list.h"
#include "ns3/nstime.h"
#include "ns3/ptr.h"
#include "ns3/random-variable-stream.h"
#include "ns3/rectangle.h"
#include "ns3/simulator.h"
#include "ns3/uan-phy-gen.h"
#include "ns3/wifi-phy.h"
 
#include <cstdio>
#include <map>
#include <string>
 
namespace ns3
{
 
#define MAX_PKTS_PER_TRACE_FILE 100000
#define PURGE_INTERVAL 5
#define NETANIM_VERSION "netanim-3.108"
#define CHECK_STARTED_INTIMEWINDOW                                                                 \
    {                                                                                              \
        if (!m_started || !IsInTimeWindow())                                                       \
        {                                                                                          \
            return;                                                                                \
        }                                                                                          \
    }
#define CHECK_STARTED_INTIMEWINDOW_TRACKPACKETS                                                    \
    {                                                                                              \
        if (!m_started || !IsInTimeWindow() || !m_trackPackets)                                    \
        {                                                                                          \
            return;                                                                                \
        }                                                                                          \
    }
 
struct NodeSize;
class WifiPsdu;
 
class AnimationInterface
{
  public:
    AnimationInterface(const std::string filename);
 
    enum CounterType
    {
        UINT32_COUNTER,
        DOUBLE_COUNTER
    };
 
    typedef void (*AnimWriteCallback)(const char* str);
 
    ~AnimationInterface();
 
    void EnableIpv4L3ProtocolCounters(Time startTime,
                                      Time stopTime,
                                      Time pollInterval = Seconds(1));
 
    void EnableQueueCounters(Time startTime, Time stopTime, Time pollInterval = Seconds(1));
 
    void EnableWifiMacCounters(Time startTime, Time stopTime, Time pollInterval = Seconds(1));
 
    void EnableWifiPhyCounters(Time startTime, Time stopTime, Time pollInterval = Seconds(1));
 
    AnimationInterface& EnableIpv4RouteTracking(std::string fileName,
                                                Time startTime,
                                                Time stopTime,
                                                Time pollInterval = Seconds(5));
 
    AnimationInterface& EnableIpv4RouteTracking(std::string fileName,
                                                Time startTime,
                                                Time stopTime,
                                                NodeContainer nc,
                                                Time pollInterval = Seconds(5));
 
    static bool IsInitialized();
 
    void SetStartTime(Time t);
 
    void SetStopTime(Time t);
 
    void SetMaxPktsPerTraceFile(uint64_t maxPktsPerFile);
 
    void SetMobilityPollInterval(Time t);
 
    void SetAnimWriteCallback(AnimWriteCallback cb);
 
    void ResetAnimWriteCallback();
 
    static void SetConstantPosition(Ptr<Node> n, double x, double y, double z = 0);
 
    void UpdateNodeDescription(Ptr<Node> n, std::string descr);
 
    void UpdateNodeDescription(uint32_t nodeId, std::string descr);
 
    void UpdateNodeImage(uint32_t nodeId, uint32_t resourceId);
 
    void UpdateNodeSize(Ptr<Node> n, double width, double height);
 
    void UpdateNodeSize(uint32_t nodeId, double width, double height);
 
    void UpdateNodeColor(Ptr<Node> n, uint8_t r, uint8_t g, uint8_t b);
 
    void UpdateNodeColor(uint32_t nodeId, uint8_t r, uint8_t g, uint8_t b);
 
    void UpdateNodeCounter(uint32_t nodeCounterId, uint32_t nodeId, double counter);
 
    void SetBackgroundImage(std::string fileName,
                            double x,
                            double y,
                            double scaleX,
                            double scaleY,
                            double opacity);
 
    void UpdateLinkDescription(uint32_t fromNode, uint32_t toNode, std::string linkDescription);
 
    void UpdateLinkDescription(Ptr<Node> fromNode, Ptr<Node> toNode, std::string linkDescription);
 
    AnimationInterface& AddSourceDestination(uint32_t fromNodeId,
                                             std::string destinationIpv4Address);
 
    bool IsStarted() const;
 
    void SkipPacketTracing();
 
    void EnablePacketMetadata(bool enable = true);
 
    uint64_t GetTracePktCount() const;
 
    uint32_t AddNodeCounter(std::string counterName, CounterType counterType);
 
    uint32_t AddResource(std::string resourcePath);
 
    double GetNodeEnergyFraction(Ptr<const Node> node) const;
 
  private:
    class AnimPacketInfo
 
    {
      public:
        AnimPacketInfo();
        AnimPacketInfo(const AnimPacketInfo& pInfo);
        AnimPacketInfo(Ptr<const NetDevice> tx_nd, const Time fbTx, uint32_t txNodeId = 0);
        Ptr<const NetDevice> m_txnd; 
        uint32_t m_txNodeId;         
        double m_fbTx;               
        double m_lbTx;               
        double m_fbRx;               
        double m_lbRx;               
        Ptr<const NetDevice> m_rxnd; 
        void ProcessRxBegin(Ptr<const NetDevice> nd, const double fbRx);
    };
 
    struct Rgb
    {
        uint8_t r; 
        uint8_t g; 
        uint8_t b; 
    };             
 
    struct P2pLinkNodeIdPair
    {
        uint32_t fromNode; 
        uint32_t toNode;   
    };                     
 
    struct LinkProperties
    {
        std::string fromNodeDescription; 
        std::string toNodeDescription;   
        std::string linkDescription;     
    };                                   
 
    struct LinkPairCompare
    {
        bool operator()(P2pLinkNodeIdPair first, P2pLinkNodeIdPair second) const
        {
            // Check if they are the same node pairs but flipped
            if (((first.fromNode == second.fromNode) && (first.toNode == second.toNode)) ||
                ((first.fromNode == second.toNode) && (first.toNode == second.fromNode)))
            {
                return false;
            }
            std::ostringstream oss1;
            oss1 << first.fromNode << first.toNode;
            std::ostringstream oss2;
            oss2 << second.fromNode << second.toNode;
            return oss1.str() < oss2.str();
        }
    };
 
    struct Ipv4RouteTrackElement
    {
        std::string destination; 
        uint32_t fromNodeId;     
    };                           
 
    struct Ipv4RoutePathElement
    {
        uint32_t nodeId;     
        std::string nextHop; 
    };                       
 
    enum ProtocolType
    {
        UAN,
        LTE,
        WIFI,
        WIMAX,
        CSMA,
        LRWPAN,
        WAVE
    };
 
    struct NodeSize
    {
        double width;  
        double height; 
    };                 
 
    typedef std::map<P2pLinkNodeIdPair, LinkProperties, LinkPairCompare>
        LinkPropertiesMap;                                       
    typedef std::map<uint32_t, std::string> NodeDescriptionsMap; 
    typedef std::map<uint32_t, Rgb> NodeColorsMap;               
    typedef std::map<uint64_t, AnimPacketInfo>
        AnimUidPacketInfoMap;                             
    typedef std::map<uint32_t, double> EnergyFractionMap; 
    typedef std::vector<Ipv4RoutePathElement>
        Ipv4RoutePathElements;                                  
    typedef std::multimap<uint32_t, std::string> NodeIdIpv4Map; 
    typedef std::multimap<uint32_t, std::string> NodeIdIpv6Map; 
    typedef std::pair<uint32_t, std::string> NodeIdIpv4Pair;    
    typedef std::pair<uint32_t, std::string> NodeIdIpv6Pair;    
 
    // Node Counters
    typedef std::map<uint32_t, uint64_t> NodeCounterMap64; 
 
    class AnimXmlElement
    {
      public:
        AnimXmlElement(std::string tagName, bool emptyElement = true);
        template <typename T>
        void AddAttribute(std::string attribute, T value, bool xmlEscape = false);
        void SetText(std::string text);
        void AppendChild(AnimXmlElement e);
        std::string ToString(bool autoClose = true);
 
      private:
        std::string m_tagName;                 
        std::string m_text;                    
        std::vector<std::string> m_attributes; 
        std::vector<std::string> m_children;   
    };
 
    // ##### State #####
 
    FILE* m_f;                             
    FILE* m_routingF;                      
    Time m_mobilityPollInterval;           
    std::string m_outputFileName;          
    uint64_t gAnimUid;                     
    AnimWriteCallback m_writeCallback;     
    bool m_started;                        
    bool m_enablePacketMetadata;           
    Time m_startTime;                      
    Time m_stopTime;                       
    uint64_t m_maxPktsPerFile;             
    std::string m_originalFileName;        
    Time m_routingStopTime;                
    std::string m_routingFileName;         
    Time m_routingPollInterval;            
    NodeContainer m_routingNc;             
    Time m_ipv4L3ProtocolCountersStopTime; 
    Time m_ipv4L3ProtocolCountersPollInterval; 
    Time m_queueCountersStopTime;              
    Time m_queueCountersPollInterval;          
    Time m_wifiMacCountersStopTime;            
    Time m_wifiMacCountersPollInterval;        
    Time m_wifiPhyCountersStopTime;            
    Time m_wifiPhyCountersPollInterval;        
    static Rectangle* userBoundary;            
    bool m_trackPackets;                       
 
    // Counter ID
    uint32_t m_remainingEnergyCounterId; 
 
    uint32_t m_ipv4L3ProtocolTxCounterId;   
    uint32_t m_ipv4L3ProtocolRxCounterId;   
    uint32_t m_ipv4L3ProtocolDropCounterId; 
 
    uint32_t m_queueEnqueueCounterId; 
    uint32_t m_queueDequeueCounterId; 
    uint32_t m_queueDropCounterId;    
 
    uint32_t m_wifiMacTxCounterId;     
    uint32_t m_wifiMacTxDropCounterId; 
    uint32_t m_wifiMacRxCounterId;     
    uint32_t m_wifiMacRxDropCounterId; 
 
    uint32_t m_wifiPhyTxDropCounterId; 
    uint32_t m_wifiPhyRxDropCounterId; 
 
    AnimUidPacketInfoMap m_pendingWifiPackets;   
    AnimUidPacketInfoMap m_pendingWimaxPackets;  
    AnimUidPacketInfoMap m_pendingLrWpanPackets; 
    AnimUidPacketInfoMap m_pendingLtePackets;    
    AnimUidPacketInfoMap m_pendingCsmaPackets;   
    AnimUidPacketInfoMap m_pendingUanPackets;    
    AnimUidPacketInfoMap m_pendingWavePackets;   
 
    std::map<uint32_t, Vector> m_nodeLocation;         
    std::map<std::string, uint32_t> m_macToNodeIdMap;  
    std::map<std::string, uint32_t> m_ipv4ToNodeIdMap; 
    std::map<std::string, uint32_t> m_ipv6ToNodeIdMap; 
    NodeIdIpv4Map m_nodeIdIpv4Map;                     
    NodeIdIpv6Map m_nodeIdIpv6Map;                     
 
    NodeColorsMap m_nodeColors;                                  
    NodeDescriptionsMap m_nodeDescriptions;                      
    LinkPropertiesMap m_linkProperties;                          
    EnergyFractionMap m_nodeEnergyFraction;                      
    uint64_t m_currentPktCount;                                  
    std::vector<Ipv4RouteTrackElement> m_ipv4RouteTrackElements; 
    std::map<uint32_t, NodeSize> m_nodeSizes;                    
    std::vector<std::string> m_resources;                        
    std::vector<std::string> m_nodeCounters;                     
 
    /* Value-added custom counters */
    NodeCounterMap64 m_nodeIpv4Drop;        
    NodeCounterMap64 m_nodeIpv4Tx;          
    NodeCounterMap64 m_nodeIpv4Rx;          
    NodeCounterMap64 m_nodeQueueEnqueue;    
    NodeCounterMap64 m_nodeQueueDequeue;    
    NodeCounterMap64 m_nodeQueueDrop;       
    NodeCounterMap64 m_nodeWifiMacTx;       
    NodeCounterMap64 m_nodeWifiMacTxDrop;   
    NodeCounterMap64 m_nodeWifiMacRx;       
    NodeCounterMap64 m_nodeWifiMacRxDrop;   
    NodeCounterMap64 m_nodeWifiPhyTxDrop;   
    NodeCounterMap64 m_nodeWifiPhyRxDrop;   
    NodeCounterMap64 m_nodeLrWpanMacTx;     
    NodeCounterMap64 m_nodeLrWpanMacTxDrop; 
    NodeCounterMap64 m_nodeLrWpanMacRx;     
    NodeCounterMap64 m_nodeLrWpanMacRxDrop; 
 
    const std::vector<std::string> GetElementsFromContext(const std::string& context) const;
    Ptr<Node> GetNodeFromContext(const std::string& context) const;
    Ptr<NetDevice> GetNetDeviceFromContext(std::string context);
 
    // ##### General #####
    void StartAnimation(bool restart = false);
    void SetOutputFile(const std::string& fn, bool routing = false);
    void StopAnimation(bool onlyAnimation = false);
    std::string CounterTypeToString(CounterType counterType);
    std::string GetPacketMetadata(Ptr<const Packet> p);
    void AddByteTag(uint64_t animUid, Ptr<const Packet> p);
    int WriteN(const char* data, uint32_t count, FILE* f);
    int WriteN(const std::string& st, FILE* f);
    std::string GetMacAddress(Ptr<NetDevice> nd);
    std::string GetIpv4Address(Ptr<NetDevice> nd);
    std::string GetIpv6Address(Ptr<NetDevice> nd);
    std::vector<std::string> GetIpv4Addresses(Ptr<NetDevice> nd);
    std::vector<std::string> GetIpv6Addresses(Ptr<NetDevice> nd);
 
    std::string GetNetAnimVersion();
    void MobilityAutoCheck();
    bool IsPacketPending(uint64_t animUid, ProtocolType protocolType);
    void PurgePendingPackets(ProtocolType protocolType);
    AnimUidPacketInfoMap* ProtocolTypeToPendingPackets(ProtocolType protocolType);
    std::string ProtocolTypeToString(ProtocolType protocolType);
    void AddPendingPacket(ProtocolType protocolType, uint64_t animUid, AnimPacketInfo pktInfo);
    uint64_t GetAnimUidFromPacket(Ptr<const Packet>);
    void AddToIpv4AddressNodeIdTable(std::string ipv4Address, uint32_t nodeId);
    void AddToIpv4AddressNodeIdTable(std::vector<std::string> ipv4Addresses, uint32_t nodeId);
    void AddToIpv6AddressNodeIdTable(std::string ipv6Address, uint32_t nodeId);
    void AddToIpv6AddressNodeIdTable(std::vector<std::string> ipv6Addresses, uint32_t nodeId);
    bool IsInTimeWindow();
    void CheckMaxPktsPerTraceFile();
 
    void TrackWifiPhyCounters();
    void TrackWifiMacCounters();
    void TrackIpv4L3ProtocolCounters();
    void TrackQueueCounters();
    // ##### Routing #####
    void TrackIpv4Route();
    void TrackIpv4RoutePaths();
    std::string GetIpv4RoutingTable(Ptr<Node> n);
    void RecursiveIpv4RoutePathSearch(std::string from,
                                      std::string to,
                                      Ipv4RoutePathElements& rpElements);
    void WriteRoutePath(uint32_t nodeId, std::string destination, Ipv4RoutePathElements rpElements);
 
    // ##### Trace #####
    void EnqueueTrace(std::string context, Ptr<const Packet>);
    void DequeueTrace(std::string context, Ptr<const Packet>);
    void QueueDropTrace(std::string context, Ptr<const Packet>);
    void Ipv4TxTrace(std::string context,
                     Ptr<const Packet> p,
                     Ptr<Ipv4> ipv4,
                     uint32_t interfaceIndex);
    void Ipv4RxTrace(std::string context,
                     Ptr<const Packet> p,
                     Ptr<Ipv4> ipv4,
                     uint32_t interfaceIndex);
    void Ipv4DropTrace(std::string context,
                       const Ipv4Header& ipv4Header,
                       Ptr<const Packet> p,
                       Ipv4L3Protocol::DropReason dropReason,
                       Ptr<Ipv4> ipv4,
                       uint32_t interfaceIndex);
 
    void WifiMacTxTrace(std::string context, Ptr<const Packet> p);
    void WifiMacTxDropTrace(std::string context, Ptr<const Packet> p);
    void WifiMacRxTrace(std::string context, Ptr<const Packet> p);
    void WifiMacRxDropTrace(std::string context, Ptr<const Packet> p);
    void WifiPhyTxDropTrace(std::string context, Ptr<const Packet> p);
    void WifiPhyRxDropTrace(std::string context,
                            Ptr<const Packet> p,
                            WifiPhyRxfailureReason reason);
    void LrWpanMacTxTrace(std::string context, Ptr<const Packet> p);
    void LrWpanMacTxDropTrace(std::string context, Ptr<const Packet> p);
    void LrWpanMacRxTrace(std::string context, Ptr<const Packet> p);
    void LrWpanMacRxDropTrace(std::string context, Ptr<const Packet> p);
    void DevTxTrace(std::string context,
                    Ptr<const Packet> p,
                    Ptr<NetDevice> tx,
                    Ptr<NetDevice> rx,
                    Time txTime,
                    Time rxTime);
    void WifiPhyTxBeginTrace(std::string context,
                             WifiConstPsduMap psduMap,
                             WifiTxVector txVector,
                             double txPowerW);
    void WifiPhyRxBeginTrace(std::string context,
                             Ptr<const Packet> p,
                             RxPowerWattPerChannelBand rxPowersW);
    void WavePhyTxBeginTrace(std::string context, Ptr<const Packet> p);
    void WavePhyRxBeginTrace(std::string context, Ptr<const Packet> p);
    void LrWpanPhyTxBeginTrace(std::string context, Ptr<const Packet> p);
    void LrWpanPhyRxBeginTrace(std::string context, Ptr<const Packet> p);
    void WimaxTxTrace(std::string context, Ptr<const Packet> p, const Mac48Address& m);
    void WimaxRxTrace(std::string context, Ptr<const Packet> p, const Mac48Address& m);
    void CsmaPhyTxBeginTrace(std::string context, Ptr<const Packet> p);
    void CsmaPhyTxEndTrace(std::string context, Ptr<const Packet> p);
    void CsmaPhyRxEndTrace(std::string context, Ptr<const Packet> p);
    void CsmaMacRxTrace(std::string context, Ptr<const Packet> p);
    void LteTxTrace(std::string context, Ptr<const Packet> p, const Mac48Address& m);
    void LteRxTrace(std::string context, Ptr<const Packet> p, const Mac48Address& m);
    void LteSpectrumPhyTxStart(std::string context, Ptr<const PacketBurst> pb);
    void LteSpectrumPhyRxStart(std::string context, Ptr<const PacketBurst> pb);
    void UanPhyGenTxTrace(std::string context, Ptr<const Packet>);
    void UanPhyGenRxTrace(std::string context, Ptr<const Packet>);
    void RemainingEnergyTrace(std::string context, double previousEnergy, double currentEnergy);
    void GenericWirelessTxTrace(std::string context,
                                Ptr<const Packet> p,
                                ProtocolType protocolType);
    void GenericWirelessRxTrace(std::string context,
                                Ptr<const Packet> p,
                                ProtocolType protocolType);
 
    void ConnectCallbacks();
    void ConnectLte();
    void ConnectLteUe(Ptr<Node> n, Ptr<LteUeNetDevice> nd, uint32_t devIndex);
    void ConnectLteEnb(Ptr<Node> n, Ptr<LteEnbNetDevice> nd, uint32_t devIndex);
 
    // ##### Mobility #####
    Vector GetPosition(Ptr<Node> n);
    Vector UpdatePosition(Ptr<Node> n);
    Vector UpdatePosition(Ptr<Node> n, Vector v);
    Vector UpdatePosition(Ptr<NetDevice> ndev);
    bool NodeHasMoved(Ptr<Node> n, Vector newLocation);
    std::vector<Ptr<Node>> GetMovedNodes();
    void MobilityCourseChangeTrace(Ptr<const MobilityModel> mob);
 
    // ##### XML Helpers #####
 
    void WriteNonP2pLinkProperties(uint32_t id, std::string ipv4Address, std::string channelType);
    void WriteNodeUpdate(uint32_t nodeId);
    void OutputWirelessPacketTxInfo(Ptr<const Packet> p, AnimPacketInfo& pktInfo, uint64_t animUid);
    void OutputWirelessPacketRxInfo(Ptr<const Packet> p, AnimPacketInfo& pktInfo, uint64_t animUid);
    void OutputCsmaPacket(Ptr<const Packet> p, AnimPacketInfo& pktInfo);
    void WriteLinkProperties();
    void WriteIpv4Addresses();
    void WriteIpv6Addresses();
    void WriteNodes();
    void WriteNodeColors();
    void WriteNodeSizes();
    void WriteNodeEnergies();
    void WriteXmlAnim(bool routing = false);
    void WriteXmlUpdateNodePosition(uint32_t nodeId, double x, double y);
    void WriteXmlUpdateNodeColor(uint32_t nodeId, uint8_t r, uint8_t g, uint8_t b);
    void WriteXmlUpdateNodeDescription(uint32_t nodeId);
    void WriteXmlUpdateNodeSize(uint32_t nodeId, double width, double height);
    void WriteXmlAddResource(uint32_t resourceId, std::string resourcePath);
    void WriteXmlAddNodeCounter(uint32_t counterId,
                                std::string counterName,
                                CounterType counterType);
    void WriteXmlUpdateNodeImage(uint32_t nodeId, uint32_t resourceId);
    void WriteXmlUpdateNodeCounter(uint32_t counterId, uint32_t nodeId, double value);
    void WriteXmlNode(uint32_t id, uint32_t sysId, double locX, double locY);
    void WriteXmlLink(uint32_t fromId, uint32_t toLp, uint32_t toId);
    void WriteXmlUpdateLink(uint32_t fromId, uint32_t toId, std::string linkDescription);
    void WriteXmlP(std::string pktType,
                   uint32_t fId,
                   double fbTx,
                   double lbTx,
                   uint32_t tId,
                   double fbRx,
                   double lbRx,
                   std::string metaInfo = "");
    void WriteXmlP(uint64_t animUid, std::string pktType, uint32_t fId, double fbTx, double lbTx);
    void WriteXmlPRef(uint64_t animUid, uint32_t fId, double fbTx, std::string metaInfo = "");
    void WriteXmlClose(std::string name, bool routing = false);
    void WriteXmlNonP2pLinkProperties(uint32_t id, std::string ipAddress, std::string channelType);
    void WriteXmlRouting(uint32_t id, std::string routingInfo);
    void WriteXmlRp(uint32_t nodeId, std::string destination, Ipv4RoutePathElements rpElements);
    void WriteXmlUpdateBackground(std::string fileName,
                                  double x,
                                  double y,
                                  double scaleX,
                                  double scaleY,
                                  double opacity);
    void WriteXmlIpv4Addresses(uint32_t nodeId, std::vector<std::string> ipv4Addresses);
    void WriteXmlIpv6Addresses(uint32_t nodeId, std::vector<std::string> ipv6Addresses);
};
 
class AnimByteTag : public Tag
{
  public:
    static TypeId GetTypeId();
 
    TypeId GetInstanceTypeId() const override;
 
    uint32_t GetSerializedSize() const override;
 
    void Serialize(TagBuffer i) const override;
 
    void Deserialize(TagBuffer i) override;
 
    void Print(std::ostream& os) const override;
 
    void Set(uint64_t AnimUid);
 
    uint64_t Get() const;
 
  private:
    uint64_t m_AnimUid; 
};
 
} // namespace ns3
#endif