iftable.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 : 1.32 $ of : mfd-top.m2c,v $ 
 *
 * $Id: ifTable.c,v 1.17.2.1 2004/12/10 19:44:55 rstory Exp $
 */
/** \mainpage MFD helper for ifTable
 *
 * \section intro Introduction
 * Introductory text.
 *
 */
/*
 * 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 "ifTable.h"

#include <net-snmp/agent/mib_modules.h>

#include "ifTable_interface.h"

oid             ifTable_oid[] = { IFTABLE_OID };
int             ifTable_oid_size = OID_LENGTH(ifTable_oid);

void            initialize_table_ifTable(void);


/**
 * Initializes the ifTable module
 */
void
init_ifTable(void)
{
    DEBUGMSGTL(("verbose:ifTable:init_ifTable", "called\n"));

    /*
     * TODO:300:o: Perform ifTable one-time module initialization.
     */

    /*
     * here we initialize all the tables we're planning on supporting
     */
    if (should_init("ifTable"))
        initialize_table_ifTable();

}                               /* init_ifTable */

/**
 * Initialize the table ifTable 
 *    (Define its contents and how it's structured)
 */
void
initialize_table_ifTable(void)
{
    ifTable_registration_ptr user_context;
    u_long          flags;

    DEBUGMSGTL(("verbose:ifTable:initialize_table_ifTable", "called\n"));

    /*
     * TODO:301:o: Perform ifTable one-time table initialization.
     */

    /*
     * TODO:302:o: |->Initialize ifTable user context
     * if you'd like to pass in a pointer to some data for this
     * table, allocate or set it up here.
     */
    /*
     * a netsnmp_data_list is a simple way to store void pointers. A simple
     * string token is used to add, find or remove pointers.
     */
    user_context = netsnmp_create_data_list("ifTable", NULL, NULL);

    /*
     * No support for any flags yet, but in the future you would
     * set any flags here.
     */
    flags = 0;

    /*
     * call interface initialization code
     */
    _ifTable_initialize_interface(user_context, flags);
}                               /* initialize_table_ifTable */

/**
 * extra context initialization
 *
 * @param rowreq_ctx    : row request context
 * @param user_init_ctx : void pointer for user (parameter to rowreq_ctx_allocate)
 *
 * @retval MFD_SUCCESS  : no errors
 * @retval MFD_ERROR    : error (context allocate will fail)
 */
int
ifTable_rowreq_ctx_init(ifTable_rowreq_ctx * rowreq_ctx,
                        void *user_init_ctx)
{
    DEBUGMSGTL(("verbose:ifTable:ifTable_rowreq_ctx_init", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    /*
     * TODO:210:o: |-> Perform extra ifTable rowreq initialization.
     */
    if (NULL == user_init_ctx)
        rowreq_ctx->data.ifentry =
            netsnmp_access_interface_entry_create(NULL,0);
    else
        rowreq_ctx->data.ifentry =
            (netsnmp_interface_entry *) user_init_ctx;

    return MFD_SUCCESS;
}                               /* ifTable_rowreq_ctx_init */

/**
 * extra context cleanup
 *
 */
void
ifTable_rowreq_ctx_cleanup(ifTable_rowreq_ctx * rowreq_ctx)
{
    DEBUGMSGTL(("verbose:ifTable:ifTable_rowreq_ctx_cleanup", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    /*
     * TODO:211:o: |-> Perform extra ifTable rowreq cleanup.
     */
    if (NULL != rowreq_ctx->data.ifentry) {
        netsnmp_access_interface_entry_free(rowreq_ctx->data.ifentry);
        rowreq_ctx->data.ifentry = NULL;
    }
}                               /* ifTable_rowreq_ctx_cleanup */

/**
 * pre-request callback
 *
 *
 * @retval MFD_SUCCESS              : success.
 * @retval MFD_ERROR                : other error
 */
int
ifTable_pre_request(ifTable_registration_ptr user_context)
{
    DEBUGMSGTL(("verbose:ifTable:ifTable_pre_request", "called\n"));

    /*
     * TODO:510:o: Perform ifTable pre-request actions.
     */

    return MFD_SUCCESS;
}                               /* ifTable_pre_request */

/**
 * post-request callback
 *
 *
 * @retval MFD_SUCCESS : success.
 * @retval MFD_ERROR   : other error (ignored)
 */
int
ifTable_post_request(ifTable_registration_ptr user_context)
{
    DEBUGMSGTL(("verbose:ifTable:ifTable_post_request", "called\n"));

    /*
     * TODO:511:o: Perform ifTable pos-request actions.
     */

    return MFD_SUCCESS;
}                               /* ifTable_post_request */


/**********************************************************************
 **********************************************************************
 ***
 *** Table ifTable
 ***
 **********************************************************************
 **********************************************************************/
/*
 * ifTable is subid 2 of interfaces.
 * Its status is Current.
 * OID: .1.3.6.1.2.1.2.2, length: 8
 */



/**
 * set mib index(es)
 *
 * @param tbl_idx mib index structure
 *
 * @retval MFD_SUCCESS     : success.
 * @retval MFD_ERROR       : other error.
 *
 * @remark
 *  This convenience function is useful for setting all the MIB index
 *  components with a single function call. It is assume that the C values
 *  have already been mapped from their native/rawformat to the MIB format.
 */
int
ifTable_indexes_set_tbl_idx(ifTable_mib_index * tbl_idx, long ifIndex_val)
{
    DEBUGMSGTL(("verbose:ifTable:ifTable_indexes_set_tbl_idx",
                "called\n"));

    /*
     * ifIndex(1)/InterfaceIndex/ASN_INTEGER/long(long)//l/A/w/e/R/d/H 
     */
    tbl_idx->ifIndex = ifIndex_val;


    return MFD_SUCCESS;
}                               /* ifTable_indexes_set_tbl_idx */

/**
 * @internal
 * set row context indexes
 *
 * @param reqreq_ctx the row context that needs updated indexes
 *
 * @retval MFD_SUCCESS     : success.
 * @retval MFD_ERROR       : other error.
 *
 * @remark
 *  This function sets the mib indexs, then updates the oid indexs
 *  from the mib index.
 */
int
ifTable_indexes_set(ifTable_rowreq_ctx * rowreq_ctx, long ifIndex_val)
{
    DEBUGMSGTL(("verbose:ifTable:ifTable_indexes_set", "called\n"));

    if (MFD_SUCCESS !=
        ifTable_indexes_set_tbl_idx(&rowreq_ctx->tbl_idx, ifIndex_val))
        return MFD_ERROR;

    /*
     * convert mib index to oid index
     */
    rowreq_ctx->oid_idx.len = sizeof(rowreq_ctx->oid_tmp) / sizeof(oid);
    if (0 != ifTable_index_to_oid(&rowreq_ctx->oid_idx,
                                  &rowreq_ctx->tbl_idx)) {
        return MFD_ERROR;
    }

    return MFD_SUCCESS;
}                               /* ifTable_indexes_set */


/*---------------------------------------------------------------------
 * IF-MIB::ifEntry.ifDescr
 * ifDescr is subid 2 of ifEntry.
 * Its status is Current, and its access level is ReadOnly.
 * OID: .1.3.6.1.2.1.2.2.1.2
 * Description:
A textual string containing information about the
            interface.  This string should include the name of the
            manufacturer, the product name and the version of the
            interface hardware/software.
 *
 * Attributes:
 *   accessible 1     isscalar 0     enums  0      hasdefval 0
 *   readable   1     iscolumn 1     ranges 1      hashint   1
 *   settable   0
 *   hint: 255a
 *
 * Ranges:  0 - 255;
 *
 * Its syntax is DisplayString (based on perltype OCTETSTR)
 * The net-snmp type is ASN_OCTET_STR. The C type decl is char (char)
 * This data type requires a length.  (Max 255)
 */
/**
 * Extract the current value of the ifDescr data.
 *
 * Set a value using the data context for the row.
 *
 * @param rowreq_ctx
 *        Pointer to the row request context.
 * @param ifDescr_val_ptr_ptr
 *        Pointer to storage for a char variable
 * @param ifDescr_val_ptr_len_ptr
 *        Pointer to a size_t. On entry, it will contain the size (in bytes)
 *        pointed to by ifDescr.
 *        On exit, this value should contain the data size (in bytes).
 *
 * @retval MFD_SUCCESS         : success
 * @retval MFD_SKIP            : skip this node (no value for now)
 * @retval MFD_ERROR           : Any other error
*
 * @note If you need more than (*ifDescr_val_ptr_len_ptr) bytes of memory,
 *       allocate it using malloc() and update ifDescr_val_ptr_ptr.
 *       <b>DO NOT</b> free the previous pointer.
 *       The MFD helper will release the memory you allocate.
 *
 * @remark If you call this function yourself, you are responsible
 *         for checking if the pointer changed, and freeing any
 *         previously allocated memory. (Not necessary if you pass
 *         in a pointer to static memory, obviously.)
 */
int
ifDescr_get(ifTable_rowreq_ctx * rowreq_ctx, char **ifDescr_val_ptr_ptr,
            size_t *ifDescr_val_ptr_len_ptr)
{
    char           *tmp_descr = NULL;
    u_char          tmp_len = 0;

   /** we should have a non-NULL pointer and enough storage */
    netsnmp_assert((NULL != ifDescr_val_ptr_ptr)
                   && (NULL != *ifDescr_val_ptr_ptr));
    netsnmp_assert(NULL != ifDescr_val_ptr_len_ptr);


    DEBUGMSGTL(("verbose:ifTable:ifDescr_get", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    /*
     * if ifDescr is NULL, use the ifName
     */
    if (NULL == rowreq_ctx->data.ifDescr) {
#ifdef USING_IF_MIB_IFXTABLE_IFXTABLE_MODULE
        tmp_descr = rowreq_ctx->data.ifName;
#else
        tmp_descr = NULL;
#endif
    } else
        tmp_descr = rowreq_ctx->data.ifDescr;

    if (NULL != tmp_descr)
        tmp_len = strlen(tmp_descr);
    else
        tmp_len = 0;

    /*
     * TODO:231:o: |-> Extract the current value of the ifDescr data.
     * set (* ifDescr_val_ptr_ptr ) and (* ifDescr_val_ptr_len_ptr ) from rowreq_ctx->data
     */
    /*
     * make sure there is enough space for ifDescr data
     */
    if ((NULL == (*ifDescr_val_ptr_ptr))
        || ((*ifDescr_val_ptr_len_ptr) < tmp_len)) {
        /*
         * allocate space for ifDescr data
         */
        (*ifDescr_val_ptr_ptr) =
            malloc(tmp_len * sizeof((*ifDescr_val_ptr_ptr)[0]));
        if (NULL == (*ifDescr_val_ptr_ptr)) {
            snmp_log(LOG_ERR, "could not allocate memory\n");
            return MFD_ERROR;