inetcidrroutetable_data_access.c

snmp的源代码,已经在我的ubuntu下编译通过

/*
 * Note: this file originally auto-generated by mib2c using
 *       version : 1.12 $ of : mfd-data-access.m2c,v $ 
 *
 * $Id: inetCidrRouteTable_data_access.c,v 1.8 2004/10/18 03:56:27 rstory Exp $
 */
/*
 * standard Net-SNMP includes 
 */
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>

/*
 * include our parent header 
 */
#include "inetCidrRouteTable.h"


#include "inetCidrRouteTable_data_access.h"

/** @defgroup data_access data_access: Routines to access data
 *
 * These routines are used to locate the data used to satisfy
 * requests.
 * 
 * @{
 */
/**********************************************************************
 **********************************************************************
 ***
 *** Table inetCidrRouteTable
 ***
 **********************************************************************
 **********************************************************************/
/*
 * inetCidrRouteTable is subid 7 of ipForward.
 * Its status is Current.
 * OID: .1.3.6.1.2.1.4.24.7, length: 9
 */

/**
 * initialization for inetCidrRouteTable data access
 *
 * This function is called during startup to allow you to
 * allocate any resources you need for the data table.
 *
 * @param inetCidrRouteTable_reg
 *        Pointer to inetCidrRouteTable_registration
 *
 * @retval MFD_SUCCESS : success.
 * @retval MFD_ERROR   : unrecoverable error.
 */
int
inetCidrRouteTable_init_data(inetCidrRouteTable_registration_ptr
                             inetCidrRouteTable_reg)
{
    DEBUGMSGTL(("verbose:inetCidrRouteTable:inetCidrRouteTable_init_data",
                "called\n"));

    /*
     * TODO:303:o: Initialize inetCidrRouteTable data.
     */

    return MFD_SUCCESS;
}                               /* inetCidrRouteTable_init_data */

/**
 * container-cached overview
 *
 */

/***********************************************************************
 *
 * cache
 *
 ***********************************************************************/
/**
 * container initialization
 *
 * @param container_ptr_ptr A pointer to a container pointer. If you
 *        create a custom container, use this parameter to return it
 *        to the MFD helper. If set to NULL, the MFD helper will
 *        allocate a container for you.
 * @param  cache A pointer to a cache structure. You can set the timeout
 *         and other cache flags using this pointer.
 *
 *  This function is called at startup to allow you to customize certain
 *  aspects of the access method. For the most part, it is for advanced
 *  users. The default code should suffice for most cases. If no custom
 *  container is allocated, the MFD code will create one for your.
 *
 *  This is also the place to set up cache behavior. The default, to
 *  simply set the cache timeout, will work well with the default
 *  container. If you are using a custom container, you may want to
 *  look at the cache helper documentation to see if there are any
 *  flags you want to set.
 *
 * @remark
 *  This would also be a good place to do any initialization needed
 *  for you data source. For example, opening a connection to another
 *  process that will supply the data, opening a database, etc.
 */
void
inetCidrRouteTable_container_init(netsnmp_container ** container_ptr_ptr,
                                  netsnmp_cache * cache)
{
    DEBUGMSGTL(("verbose:inetCidrRouteTable:inetCidrRouteTable_container_init", "called\n"));

    if ((NULL == cache) || (NULL == container_ptr_ptr)) {
        snmp_log(LOG_ERR,
                 "bad params to inetCidrRouteTable_container_init\n");
        return;
    }

    /*
     * For advanced users, you can use a custom container. If you
     * do not create one, one will be created for you.
     */
    *container_ptr_ptr = NULL;

    /*
     * TODO:345:A: Set up inetCidrRouteTable cache properties.
     *
     * Also for advanced users, you can set parameters for the
     * cache. Do not change the magic pointer, as it is used
     * by the MFD helper.
     */
    cache->timeout = INETCIDRROUTETABLE_CACHE_TIMEOUT;  /* seconds */
}                               /* inetCidrRouteTable_container_init */

/**
 * check entry for update
 */
static void
_snarf_route_entry(netsnmp_route_entry * route_entry,
                   netsnmp_container * container)
{
    inetCidrRouteTable_rowreq_ctx *rowreq_ctx;

    netsnmp_assert(NULL != route_entry);
    netsnmp_assert(NULL != container);

    /*
     * per  inetCidrRouteType:
     *
     * Routes which do not result in traffic forwarding or 
     * rejection should not be displayed even if the  
     * implementation keeps them stored internally.
     */
    if (route_entry->rt_type == 0) {    /* set when route not up */
        DEBUGMSGT(("verbose:inetCidrRouteTable:inetCidrRouteTable_cache_load", "skipping route\n"));
        netsnmp_access_route_entry_free(route_entry);
        return;
    }

    /*
     * allocate an row context and set the index(es), then add it to
     * the container
     */
    rowreq_ctx = inetCidrRouteTable_allocate_rowreq_ctx(route_entry);
    if ((NULL != rowreq_ctx) &&
        (MFD_SUCCESS == inetCidrRouteTable_indexes_set
         (rowreq_ctx, route_entry->rt_dest_type,
          route_entry->rt_dest, route_entry->rt_dest_len,
          route_entry->rt_pfx_len,
          route_entry->rt_policy, route_entry->rt_policy_len,
          route_entry->rt_nexthop_type,
          route_entry->rt_nexthop, route_entry->rt_nexthop_len))) {
        CONTAINER_INSERT(container, rowreq_ctx);
        rowreq_ctx->inetCidrRouteStatus = ROWSTATUS_ACTIVE;
    } else {
        if (rowreq_ctx) {
            snmp_log(LOG_ERR, "error setting index while loading "
                     "inetCidrRoute cache.\n");
            inetCidrRouteTable_release_rowreq_ctx(rowreq_ctx);
        } else
            netsnmp_access_route_entry_free(route_entry);
    }
}

/**
 * load cache data
 *
 * TODO:350:M: Implement inetCidrRouteTable cache load
 *
 * @param container container to which items should be inserted
 *
 * @retval MFD_SUCCESS              : success.
 * @retval MFD_RESOURCE_UNAVAILABLE : Can't access data source
 * @retval MFD_ERROR                : other error.
 *
 *  This function is called to cache the index(es) (and data, optionally)
 *  for the every row in the data set.
 *
 * @remark
 *  While loading the cache, the only important thing is the indexes.
 *  If access to your data is cheap/fast (e.g. you have a pointer to a
 *  structure in memory), it would make sense to update the data here.
 *  If, however, the accessing the data invovles more work (e.g. parsing
 *  some other existing data, or peforming calculations to derive the data),
 *  then you can limit yourself to setting the indexes and saving any
 *  information you will need later. Then use the saved information in
 *  inetCidrRouteTable_row_prep() for populating data.
 *
 * @note
 *  If you need consistency between rows (like you want statistics
 *  for each row to be from the same time frame), you should set all
 *  data here.
 *
 */
int
inetCidrRouteTable_cache_load(netsnmp_container * container)
{
    inetCidrRouteTable_rowreq_ctx *rowreq_ctx;
    netsnmp_container *route_container;

    DEBUGMSGTL(("verbose:inetCidrRouteTable:inetCidrRouteTable_cache_load",
                "called\n"));

    /*
     * TODO:351:M: |-> Load/update data in the inetCidrRouteTable container.
     * loop over your inetCidrRouteTable data, allocate a rowreq context,
     * set the index(es) [and data, optionally] and insert into
     * the container.
     *
     * we use the netsnmp data access api to get the data
     */
    route_container =
        netsnmp_access_route_container_load(NULL,
                                            NETSNMP_ACCESS_ROUTE_LOAD_NOFLAGS);
    DEBUGMSGT(("verbose:inetCidrRouteTable:inetCidrRouteTable_cache_load",
               "%d records\n", CONTAINER_SIZE(route_container)));

    if (NULL == route_container)
        return MFD_RESOURCE_UNAVAILABLE;        /* msg already logged */

    /*
     * we just got a fresh copy of route data. snarf data
     */
    CONTAINER_FOR_EACH(route_container,
                       (netsnmp_container_obj_func *) _snarf_route_entry,
                       container);

    /*
     * free the container. we've either claimed each ifentry, or released it,
     * so the dal function doesn't need to clear the container.
     */
    netsnmp_access_route_container_free(route_container,
                                        NETSNMP_ACCESS_ROUTE_FREE_DONT_CLEAR);

    DEBUGMSGT(("verbose:inetCidrRouteTable:inetCidrRouteTable_cache_load",
               "%d records\n", CONTAINER_SIZE(container)));

    return MFD_SUCCESS;
}                               /* inetCidrRouteTable_cache_load */

/**
 * cache clean up
 *
 * @param container container with all current items
 *
 *  This optional callback is called prior to all
 *  item's being removed from the container. If you
 *  need to do any processing before that, do it here.
 *
 * @note
 *  The MFD helper will take care of releasing all the row contexts.
 *
 */
void
inetCidrRouteTable_cache_free(netsnmp_container * container)
{
    DEBUGMSGTL(("verbose:inetCidrRouteTable:inetCidrRouteTable_cache_free",
                "called\n"));

    /*
     * TODO:380:M: Free inetCidrRouteTable cache.
     */
}                               /* inetCidrRouteTable_cache_free */

/**
 * prepare row for processing.
 *
 *  When the agent has located the row for a request, this function is
 *  called to prepare the row for processing. If you fully populated
 *  the data context during the index setup phase, you may not need to
 *  do anything.
 *
 * @param rowreq_ctx pointer to a context.
 *
 * @retval MFD_SUCCESS     : success.
 * @retval MFD_ERROR       : other error.
 */
int
inetCidrRouteTable_row_prep(inetCidrRouteTable_rowreq_ctx * rowreq_ctx)
{
    DEBUGMSGTL(("verbose:inetCidrRouteTable:inetCidrRouteTable_row_prep",
                "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    /*
     * TODO:390:o: Prepare row for request.
     * If populating row data was delayed, this is the place to
     * fill in the row for this request.
     */

    return MFD_SUCCESS;
}                               /* inetCidrRouteTable_row_prep */

/** @} */