/*
 *  Host Resources MIB - network device group implementation - hr_network.c
 *
 */

#include <config.h>
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif

#include "host_res.h"
#include "mibII/interfaces.h"
#include "hr_network.h"


	/*********************
	 *
	 *  Kernel & interface information,
	 *   and internal forward declarations
	 *
	 *********************/

void  Init_HR_Network (void);
int   Get_Next_HR_Network (void);
void  Save_HR_Network_Info (void);

const char *describe_networkIF (int);
int   network_status (int);
int   network_errors (int);
int header_hrnet (struct variable *,oid *, size_t *, int, size_t *, WriteMethod **);

#define HRN_MONOTONICALLY_INCREASING

	/*********************
	 *
	 *  Initialisation & common implementation functions
	 *
	 *********************/

#define	HRNET_IFINDEX		1

struct variable4 hrnet_variables[] = {
    { HRNET_IFINDEX,   ASN_INTEGER, RONLY, var_hrnet, 2, {1,1}}
};
oid hrnet_variables_oid[] = { 1,3,6,1,2,1,25,3,4 };


void init_hr_network(void)
{
    init_device[ HRDEV_NETWORK ] = Init_HR_Network;	
    next_device[ HRDEV_NETWORK ] = Get_Next_HR_Network;
    save_device[ HRDEV_NETWORK ] = Save_HR_Network_Info;	
#ifdef HRN_MONOTONICALLY_INCREASING
    dev_idx_inc[ HRDEV_NETWORK ] = 1;
#endif

    device_descr[ HRDEV_NETWORK ] = describe_networkIF;
    device_status[ HRDEV_NETWORK ] = network_status;
    device_errors[ HRDEV_NETWORK ] = network_errors;

    REGISTER_MIB("host/hr_network", hrnet_variables, variable4, hrnet_variables_oid);
}

/*
  header_hrnet(...
  Arguments:
  vp	  IN      - pointer to variable entry that points here
  name    IN/OUT  - IN/name requested, OUT/name found
  length  IN/OUT  - length of IN/OUT oid's 
  exact   IN      - TRUE if an exact match was requested
  var_len OUT     - length of variable or 0 if function returned
  write_method
  
*/

int
header_hrnet(struct variable *vp,
	     oid *name,
	     size_t *length,
	     int exact,
	     size_t *var_len,
	     WriteMethod **write_method)
{
#define HRNET_ENTRY_NAME_LENGTH	11
    oid newname[MAX_OID_LEN];
    int net_idx;
    int result;
    int LowIndex = -1;

    DEBUGMSGTL(("host/hr_network", "var_hrnet: "));
    DEBUGMSGOID(("host/hr_network", name, *length));
    DEBUGMSG(("host/hr_network"," %d\n", exact));

    memcpy( (char *)newname,(char *)vp->name, vp->namelen * sizeof(oid));
	/* Find "next" net entry */

    Init_HR_Network();
    for ( ;; ) {
        net_idx = Get_Next_HR_Network();
        if ( net_idx == -1 )
	    break;
	newname[HRNET_ENTRY_NAME_LENGTH] = net_idx;
        result = snmp_oid_compare(name, *length, newname, vp->namelen + 1);
        if (exact && (result == 0)) {
	    LowIndex = net_idx;
            break;
	}
	if (!exact && (result < 0) &&
		(LowIndex == -1 || net_idx < LowIndex )) {
	    LowIndex = net_idx;
#ifdef HRN_MONOTONICALLY_INCREASING
	    break;
#endif
	}
    }

    if ( LowIndex == -1 ) {
        DEBUGMSGTL(("host/hr_network", "... index out of range\n"));
        return(MATCH_FAILED);
    }

    newname[HRNET_ENTRY_NAME_LENGTH] = LowIndex;
    memcpy( (char *)name,(char *)newname, (vp->namelen + 1) * sizeof(oid));
    *length = vp->namelen + 1;
    *write_method = 0;
    *var_len = sizeof(long);	/* default to 'long' results */

    DEBUGMSGTL(("host/hr_network", "... get net stats "));
    DEBUGMSGOID(("host/hr_network", name, *length));
    DEBUGMSG(("host/hr_network","\n"));
    return LowIndex;
}


	/*********************
	 *
	 *  System specific implementation functions
	 *
	 *********************/


u_char *
var_hrnet(struct variable *vp,
	  oid *name,
	  size_t *length,
	  int exact,
	  size_t *var_len,
	  WriteMethod **write_method)
{
    int  net_idx;

    net_idx = header_hrnet(vp, name, length, exact, var_len, write_method);
    if ( net_idx == MATCH_FAILED )
	return NULL;
        

    switch (vp->magic){
	case HRNET_IFINDEX:
	    long_return = net_idx & ((1<<HRDEV_TYPE_SHIFT)-1);
	    return (u_char *)&long_return;
	default:
	    DEBUGMSGTL(("snmpd", "unknown sub-id %d in var_hrnet\n", vp->magic));
    }
    return NULL;
}


	/*********************
	 *
	 *  Internal implementation functions
	 *
	 *********************/


#ifndef solaris2
static short		HRN_index;
#endif
static char		HRN_name[16];
static struct ifnet	HRN_ifnet;

static char		HRN_savedName[16];
static u_short		HRN_savedFlags;
static int		HRN_savedErrors;


void
Init_HR_Network (void)
{
#ifndef solaris2
   Interface_Scan_Init();
#endif
}

int
Get_Next_HR_Network (void)
{
#ifndef solaris2
    if (Interface_Scan_Next( &HRN_index, HRN_name, &HRN_ifnet, NULL))
        return ( HRDEV_NETWORK << HRDEV_TYPE_SHIFT ) + HRN_index;
    else
#endif
        return -1;
}

void
Save_HR_Network_Info (void)
{
   strcpy( HRN_savedName, HRN_name);
   HRN_savedFlags  = HRN_ifnet.if_flags;
   HRN_savedErrors = HRN_ifnet.if_ierrors + HRN_ifnet.if_oerrors;
}


const char *
describe_networkIF(int idx)
{
    static char string[100];

    sprintf( string, "network interface %s", HRN_savedName );
    return string;
}


int
network_status(int idx)
{
    if ( HRN_savedFlags & IFF_UP )
	return 2;		/* running */
    else
	return 5;		/* down */
}

int
network_errors(int idx)
{
    return HRN_savedErrors;
}
