/*
 *  SNMPv1 MIB group implementation - snmp.c
 *
 */

#include <config.h>
#include <sys/types.h>
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#if HAVE_WINSOCK_H
#include <winsock.h>
#endif

#include "mibincl.h"
#include "system.h"
#include "util_funcs.h"

#include "snmp_mib.h"
#include "sysORTable.h"
#include "default_store.h"


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

extern int snmp_enableauthentraps;
extern int snmp_enableauthentrapsset;
       int old_snmp_enableauthentraps;

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

/* define the structure we're going to ask the agent to register our
   information at */
struct variable2 snmp_variables[] = {
    {SNMPINPKTS, ASN_COUNTER, RONLY, var_snmp, 1, {1}},
    {SNMPOUTPKTS, ASN_COUNTER, RONLY, var_snmp, 1, {2}},
    {SNMPINBADVERSIONS, ASN_COUNTER, RONLY, var_snmp, 1, {3}},
    {SNMPINBADCOMMUNITYNAMES, ASN_COUNTER, RONLY, var_snmp, 1, {4}},
    {SNMPINBADCOMMUNITYUSES, ASN_COUNTER, RONLY, var_snmp, 1, {5}},
    {SNMPINASNPARSEERRORS, ASN_COUNTER, RONLY, var_snmp, 1, {6}},
    {SNMPINTOOBIGS, ASN_COUNTER, RONLY, var_snmp, 1, {8}},
    {SNMPINNOSUCHNAMES, ASN_COUNTER, RONLY, var_snmp, 1, {9}},
    {SNMPINBADVALUES, ASN_COUNTER, RONLY, var_snmp, 1, {10}},
    {SNMPINREADONLYS, ASN_COUNTER, RONLY, var_snmp, 1, {11}},
    {SNMPINGENERRS, ASN_COUNTER, RONLY, var_snmp, 1, {12}},
    {SNMPINTOTALREQVARS, ASN_COUNTER, RONLY, var_snmp, 1, {13}},
    {SNMPINTOTALSETVARS, ASN_COUNTER, RONLY, var_snmp, 1, {14}},
    {SNMPINGETREQUESTS, ASN_COUNTER, RONLY, var_snmp, 1, {15}},
    {SNMPINGETNEXTS, ASN_COUNTER, RONLY, var_snmp, 1, {16}},
    {SNMPINSETREQUESTS, ASN_COUNTER, RONLY, var_snmp, 1, {17}},
    {SNMPINGETRESPONSES, ASN_COUNTER, RONLY, var_snmp, 1, {18}},
    {SNMPINTRAPS, ASN_COUNTER, RONLY, var_snmp, 1, {19}},
    {SNMPOUTTOOBIGS, ASN_COUNTER, RONLY, var_snmp, 1, {20}},
    {SNMPOUTNOSUCHNAMES, ASN_COUNTER, RONLY, var_snmp, 1, {21}},
    {SNMPOUTBADVALUES, ASN_COUNTER, RONLY, var_snmp, 1, {22}},
    {SNMPOUTGENERRS, ASN_COUNTER, RONLY, var_snmp, 1, {24}},
    {SNMPOUTGETREQUESTS, ASN_COUNTER, RONLY, var_snmp, 1, {25}},
    {SNMPOUTGETNEXTS, ASN_COUNTER, RONLY, var_snmp, 1, {26}},
    {SNMPOUTSETREQUESTS, ASN_COUNTER, RONLY, var_snmp, 1, {27}},
    {SNMPOUTGETRESPONSES, ASN_COUNTER, RONLY, var_snmp, 1, {28}},
    {SNMPOUTTRAPS, ASN_COUNTER, RONLY, var_snmp, 1, {29}},
    {SNMPENABLEAUTHENTRAPS, ASN_INTEGER, RWRITE, var_snmp, 1, {30}},
    {SNMPSILENTDROPS, ASN_COUNTER, RONLY, var_snmp, 1, {31}},
    {SNMPPROXYDROPS, ASN_COUNTER, RONLY, var_snmp, 1, {32}}
};

/* Define the OID pointer to the top of the mib tree that we're
   registering underneath */
oid snmp_variables_oid[] = { SNMP_OID_MIB2,11 };
#ifdef USING_MIBII_SYSTEM_MIB_MODULE
extern oid system_module_oid[];
extern int system_module_oid_len;
extern int system_module_count;
#endif

static int
snmp_enableauthentraps_store(int a, int b, void *c, void *d)
{
  char line[SNMP_MAXBUF_SMALL];

  if (snmp_enableauthentrapsset > 0) {
      snprintf(line, SNMP_MAXBUF_SMALL, "pauthtrapenable %d",
	       snmp_enableauthentraps);
      snmpd_store_config(line);
  }
  return 0;
}

void
init_snmp_mib(void) {
  /* register ourselves with the agent to handle our mib tree */
  REGISTER_MIB("mibII/snmp", snmp_variables, variable2, snmp_variables_oid);

#ifdef USING_MIBII_SYSTEM_MIB_MODULE
  if ( ++system_module_count == 3 )
	REGISTER_SYSOR_TABLE( system_module_oid, system_module_oid_len,
		"The MIB module for SNMPv2 entities");
#endif
  snmp_register_callback(SNMP_CALLBACK_LIBRARY, SNMP_CALLBACK_STORE_DATA,
			 snmp_enableauthentraps_store, NULL);
}

/*
  header_snmp(...
  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
  
*/

	/*********************
	 *
	 *  System specific implementation functions
	 *	(actually common!)
	 *
	 *********************/


u_char *
var_snmp(struct variable *vp,
	 oid *name,
	 size_t *length,
	 int exact,
	 size_t *var_len,
	 WriteMethod **write_method)
{
  static long long_ret;

  *write_method = 0;         /* assume it isnt writable for the time being */
  *var_len = sizeof(long_ret); /* assume an integer and change later if not */

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

    /* this is where we do the value assignments for the mib results. */
  if (vp->magic == SNMPENABLEAUTHENTRAPS) {
    *write_method = write_snmp;
    long_return = snmp_enableauthentraps;
    return (u_char *) &long_return;
  } else if ( (vp->magic >= 1)
       && (vp->magic <= (STAT_SNMP_STATS_END - STAT_SNMP_STATS_START + 1)) ) {
    long_ret = snmp_get_statistic(vp->magic + STAT_SNMP_STATS_START - 1);
    return (unsigned char *) &long_ret;
  }
  return NULL;
}

/*
 * only for snmpEnableAuthenTraps:
 */

int
write_snmp (int action,
	    u_char *var_val,
	    u_char var_val_type,
	    size_t var_val_len,
	    u_char *statP,
	    oid *name,
	    size_t name_len)
{
    long intval = 0;

    switch ( action ) {
	case RESERVE1:			/* Check values for acceptability */
	    if (var_val_type != ASN_INTEGER){
	        DEBUGMSGTL(("mibII/snmp_mib", "%x not integer type", var_val_type));
		return SNMP_ERR_WRONGTYPE;
	    }
	
            intval = *((long *) var_val);
	    if (intval != 1 && intval != 2) {
	        DEBUGMSGTL(("mibII/snmp_mib", "not valid %x\n", intval));
		return SNMP_ERR_WRONGVALUE;
	    }
	    if (snmp_enableauthentrapsset < 0) {
		/*  The object is set in a read-only configuration file.  */
		return SNMP_ERR_NOTWRITABLE;
	    }
	    break;

	case RESERVE2:			/* Allocate memory and similar resources */

		/* Using static variables, so nothing needs to be done */
	    break;

	case ACTION:			/* Perform the SET action (if reversible) */

		/* Save the old value, in case of UNDO */
            intval = *((long *) var_val);
	    old_snmp_enableauthentraps = snmp_enableauthentraps;
	    snmp_enableauthentraps = intval;	
	    break;

	case UNDO:			/* Reverse the SET action and free resources */

	    snmp_enableauthentraps = old_snmp_enableauthentraps;
	    break;

	case COMMIT:
	    snmp_enableauthentrapsset = 1;
	    snmp_save_persistent(ds_get_string(DS_LIBRARY_ID, DS_LIB_APPTYPE));
	    (void)snmp_call_callbacks(SNMP_CALLBACK_LIBRARY,
				      SNMP_CALLBACK_STORE_DATA, NULL);
	    snmp_clean_persistent(ds_get_string(DS_LIBRARY_ID,DS_LIB_APPTYPE));
	    break;

	case FREE:			/* Free any resources allocated */
	    break;
    }
    return SNMP_ERR_NOERROR;
}

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