RIP.h

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/************************************************************************************
* Copyright (C) 2020     
*
* TETCOS, Bangalore. India                                                         *
 
* Tetcos owns the intellectual property rights in the Product and its content.     *
* The copying, redistribution, reselling or publication of any or all of the       *
* Product or its content without express prior written consent of Tetcos is        *
* prohibited. Ownership and / or any other right relating to the software and all  *
* intellectual property rights therein shall remain at all times with Tetcos.      *
 
* Author:  Thangarasu.K                                                       *
* ---------------------------------------------------------------------------------*/
 
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*                                                                                                   *
*   THIS FILES CONTAIN RIP DATASTUCTURE WHICH HAS VARIABLES THAT ARE PROVIDED FOR USERS.    *    
*                                                                                                    *
*   BY MAKING USE OF THESE VARIABLES THE USER CAN CREATE THEIR OWN PROJECT IN RIP            *
*                                                                                                    *    
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *  */
#ifndef _RIP_H_
#define _RIP_H_
#ifdef  __cplusplus
extern "C" {
#endif
 
#define RIP_PACKET_SIZE_WITH_HEADER 512 
#define RIP_PORT 520 // Reference : RFC 2453, November 1998, Page 20
    // RIP has a routing process that sends and receives datagrams on UDP port number 520
#define EXPIRED_ROUTE 16 //Infinity route
#define _RIP_Trace
    FILE *fpRIPTrace;
 
    //RIP
    typedef struct stru_NetSim_Router DEVICE_ROUTER;
    typedef struct stru_Router_Buffer BUFFER_ROUTER;
    typedef struct stru_NetSim_RIP_Packet RIP_PACKET; //RIP Packet structure
    typedef struct stru_Router_RIP_Routing_database RIP_ROUTING_DATABASE; // Routing database structure
    typedef struct  stru_RIP_TempRouting_database RIP_TEMPROUTING_DATABASE;
    typedef struct stru_RIPEntry RIP_ENTRY; 
    typedef enum enum_RIP_command RIP_COMMAND; 
    typedef enum enum_RIP_Subevent_Type SUB_EVENT;
 
 
 
    /** Enumeration for RIP Sub event Types*/
    enum enum_RIP_Subevent_Type
    {
        SEND_RIP_UPDATE_PKT=APP_PROTOCOL_RIP*100+1,
        RIP_TIMEOUT,
        RIP_GARBAGE_COLLECTION,
        ROUTING_TABLE_UPDATION,
    };
 
 
    /// This enumeration is to denote the command field in RIP packet
    enum enum_RIP_command
    {
        REQUEST=1,
        RESPONSE,
    };
 
 
    /** Enumeration for App Layer Packet Type*/
    enum enum_RIP_ControlPacketType     
    {
        RIP_Packet = APP_PROTOCOL_RIP*100+1,
    };
    ///Routing database structure Reference : RFC 2453, November 1998, Page 8
    struct  stru_Router_RIP_Routing_database
 
    {
        NETSIM_IPAddress szAddress; ///< IP address of the destination host or destination network      
        NETSIM_IPAddress szSubnetmask; ///< Subnet mask for the destination network     
        NETSIM_IPAddress szRouter; ///< The first router along the route to the destination     
        NETSIM_ID nInterface; ///< The physical network which must be used to reach the first router        
        unsigned int nMetric; ///< Distance to the destination      
        double dTimer; ///< The amount of time since the entry was last updated
        struct stru_Router_RIP_Routing_database *pstru_Router_NextEntry;
    };
 
/**
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    RIP packet structure. RFC 2453 November 1998 Pages : 20,21
 
    The RIP packet format is:
 
       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  command (1)  |  version (1)  |       must be zero (2)        |
      +---------------+---------------+-------------------------------+
      |                                                               |
      ~                         RIP Entry (20)                        ~
      |                                                               |
      +---------------+---------------+---------------+---------------+
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
 */
    struct stru_NetSim_RIP_Packet
    {
        RIP_COMMAND command;    /**< The command field is used to specify the purpose of this message. <br/>
                                    If it is 1-->request message, 2-->response message */       
        unsigned int nVersion:8; ///< The version field is used to specify the RIP version (version 1 or 2)
        struct stru_RIPEntry *pstruRIPEntry;
    };
 
     /**
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        The format for the 20-octet route entry (RTE) for
        RIP-2 is:
 
        0                   1                   2                   3 3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Address Family Identifier (2) |        Route Tag (2)          |
       +-------------------------------+-------------------------------+
       |                         IP Address (4)                        |
       +---------------------------------------------------------------+
       |                         Subnet Mask (4)                       |
       +---------------------------------------------------------------+
       |                         Next Hop (4)                          |
       +---------------------------------------------------------------+
       |                         Metric (4)                            |
       +---------------------------------------------------------------+
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      */
    struct stru_RIPEntry
    {
        unsigned int nAddress_family_identifier:16; ///< This is used to identify the Address family of the IP address
        short int RouteTag;     
        NETSIM_IPAddress szIPv4_address; ///< Destination IPv4 address      
        NETSIM_IPAddress szSubnet_Mask;  ///< Destination Subnet Mask       
        NETSIM_IPAddress szNext_Hop; /**< The immediate next hop IP address to which packets to the destination. 
                                          specified by this route entry should be forwarded */      
        unsigned int nMetric; ///< Cost to reach the destination
        struct stru_RIPEntry *pstru_RIP_NextEntry;
    };
    /** Structure to store RIP information */
    struct stru_RIP 
    {
        int n_Update_timer;   ///< These variable values are get from configuration.xml,in RFC the update timer is mentioned as 30-second timer 
        int n_timeout_timer;
        int n_garbage_collection_timer;
        unsigned int n_RIP_Version:8;       
        unsigned int nRIP_Update;   ///< Used to check the updates in the router        
        int nDataDropped;       ///< Used to store the dropped packets                
        unsigned short int nStatus;
 
        bool nStaticRoutingFlag;        
        char* pszFilePath;  ///< Stores File path       
        char* pszFileName;  ///< Stores File Name   
    };
 
    /// This function is for forming the initial table for each router  
    int fn_NetSim_RIP_InitialTable_Creation(NETSIM_ID nDeviceId);
 
    /// This function is used to update the database of router
    int fn_NetSim_RIP_UpdatingEntriesinRoutingDatabase(struct stru_NetSim_Network *,int,NETSIM_IPAddress,NETSIM_IPAddress,NETSIM_IPAddress,NETSIM_ID,double,unsigned int);
 
    /// This function is used receive the updates from neighbor routers
    _declspec(dllexport) int fn_NetSim_RIP_ReceivingOf_RIP_Message(struct stru_NetSim_Network* ,NetSim_EVENTDETAILS*  ); 
 
    /// This function is used to trigger the update
    _declspec(dllexport)int fn_NetSim_RIP_TriggeredUpdate(struct stru_NetSim_Network *,NetSim_EVENTDETAILS *);
 
    int fn_NetSim_RIP_Run_F();
 
    int fn_NetSim_RIPTrace(struct stru_NetSim_Network*,NETSIM_ID,int);
 
 
 
    /****************** NetWorkStack DLL functions declarations *****************************************/
    /** Function for configuring RIP parameters*/
    _declspec(dllexport) int fn_NetSim_RIP_Configure_F(void** var);
 
    /** Function for Intializing RIP protocol */
    _declspec (dllexport) int fn_NetSim_RIP_Init(struct stru_NetSim_Network *NETWORK_Formal,NetSim_EVENTDETAILS *pstruEventDetails_Formal,char *pszAppPath_Formal,char *pszWritePath_Formal,int nVersion_Type,void **fnPointer);
    int fn_NetSim_RIP_Init_F(struct stru_NetSim_Network * ,NetSim_EVENTDETAILS * ,char * ,char * ,int  ,void **fnPointer);
    /** Function to run RIP protocol */
    _declspec (dllexport) int fn_NetSim_RIP_Run();
    /// Function to free the RIP protocol variable and Unload the primitives
    _declspec(dllexport) int fn_NetSim_RIP_Finish();
    int fn_NetSim_RIP_Finish_F();
    /// Return the subevent name with respect to the subevent number for writting event trace
    _declspec (dllexport) char *fn_NetSim_RIP_Trace(int nSubEvent);
    char *fn_NetSim_RIP_Trace_F(int nSubEvent);
    /// Function to free the allocated memory for the RIP packet
    _declspec(dllexport) int fn_NetSim_RIP_FreePacket(NetSim_PACKET* );
    int fn_NetSim_RIP_FreePacket_F(NetSim_PACKET* );
    /// Function to copy the RIP packet from source to destination
    _declspec(dllexport) int fn_NetSim_RIP_CopyPacket(NetSim_PACKET*  ,NetSim_PACKET* );
    int fn_NetSim_RIP_CopyPacket_F(NetSim_PACKET* ,NetSim_PACKET* );
 
    _declspec(dllexport) int fn_NetSim_RIP_Metrics(PMETRICSWRITER metricsWriter);
    int fn_NetSim_RIP_Metrics_F(PMETRICSWRITER metricsWriter);
 
    int fn_NetSim_RIP_DistanceVectorAlgorithm(struct stru_NetSim_Network *NETWORK,NetSim_EVENTDETAILS *pstruEventDetails);
    int fn_NetSim_RIP_Update_Timer(struct stru_NetSim_Network *pstruNETWORK,NetSim_EVENTDETAILS *pstruEventDetails);
    int fn_NetSim_RIP_Timeout_Timer(struct stru_NetSim_Network *pstruNETWORK,NetSim_EVENTDETAILS *pstruEventDetails);
    int fn_NetSim_RIP_Garbage_Collection_Timer(struct stru_NetSim_Network *pstruNETWORK,NetSim_EVENTDETAILS *pstruEventDetails);
    bool isRIPConfigured(NETSIM_ID d);
    DEVICE_ROUTER* get_RIP_var(NETSIM_ID d);
    void set_RIP_var(NETSIM_ID d, DEVICE_ROUTER* rip);
#ifdef  __cplusplus
}
#endif
#endif /* _RIP_H_*/