inetnettomediatable_interface.c

开发snmp的开发包有两个开放的SNMP开发库

    /*
     * inetNetToMediaNetAddressType(2)/InetAddressType/ASN_INTEGER/long(u_long)//l/a/w/E/r/d/h
     */
    netsnmp_variable_list var_inetNetToMediaNetAddressType;
    /*
     * inetNetToMediaNetAddress(3)/InetAddress/ASN_OCTET_STR/char(char)//L/a/w/e/R/d/h
     */
    netsnmp_variable_list var_inetNetToMediaNetAddress;

    /*
     * set up varbinds
     */
    memset(&var_inetNetToMediaIfIndex, 0x00,
           sizeof(var_inetNetToMediaIfIndex));
    var_inetNetToMediaIfIndex.type = ASN_INTEGER;
    memset(&var_inetNetToMediaNetAddressType, 0x00,
           sizeof(var_inetNetToMediaNetAddressType));
    var_inetNetToMediaNetAddressType.type = ASN_INTEGER;
    memset(&var_inetNetToMediaNetAddress, 0x00,
           sizeof(var_inetNetToMediaNetAddress));
    var_inetNetToMediaNetAddress.type = ASN_OCTET_STR;

    /*
     * chain temp index varbinds together
     */
    var_inetNetToMediaIfIndex.next_variable =
        &var_inetNetToMediaNetAddressType;
    var_inetNetToMediaNetAddressType.next_variable =
        &var_inetNetToMediaNetAddress;
    var_inetNetToMediaNetAddress.next_variable = NULL;


    DEBUGMSGTL(("verbose:inetNetToMediaTable:inetNetToMediaTable_index_to_oid", "called\n"));

    /*
     * inetNetToMediaIfIndex(1)/InterfaceIndex/ASN_INTEGER/long(long)//l/a/w/e/R/d/H 
     */
    snmp_set_var_value(&var_inetNetToMediaIfIndex,
                       (u_char *) & mib_idx->inetNetToMediaIfIndex,
                       sizeof(mib_idx->inetNetToMediaIfIndex));

    /*
     * inetNetToMediaNetAddressType(2)/InetAddressType/ASN_INTEGER/long(u_long)//l/a/w/E/r/d/h 
     */
    snmp_set_var_value(&var_inetNetToMediaNetAddressType,
                       (u_char *) & mib_idx->inetNetToMediaNetAddressType,
                       sizeof(mib_idx->inetNetToMediaNetAddressType));

    /*
     * inetNetToMediaNetAddress(3)/InetAddress/ASN_OCTET_STR/char(char)//L/a/w/e/R/d/h 
     */
    snmp_set_var_value(&var_inetNetToMediaNetAddress,
                       (u_char *) & mib_idx->inetNetToMediaNetAddress,
                       mib_idx->inetNetToMediaNetAddress_len *
                       sizeof(mib_idx->inetNetToMediaNetAddress[0]));


    err = build_oid_noalloc(oid_idx->oids, oid_idx->len, &oid_idx->len,
                            NULL, 0, &var_inetNetToMediaIfIndex);
    if (err)
        snmp_log(LOG_ERR, "error %d converting index to oid\n", err);

    /*
     * parsing may have allocated memory. free it.
     */
    snmp_reset_var_buffers(&var_inetNetToMediaIfIndex);

    return err;
}                               /* inetNetToMediaTable_index_to_oid */

/**
 * extract inetNetToMediaTable indexes from a netsnmp_index
 *
 * @retval SNMP_ERR_NOERROR  : no error
 * @retval SNMP_ERR_GENERR   : error
 */
int
inetNetToMediaTable_index_from_oid(netsnmp_index * oid_idx,
                                   inetNetToMediaTable_mib_index * mib_idx)
{
    int             err = SNMP_ERR_NOERROR;

    /*
     * temp storage for parsing indexes
     */
    /*
     * inetNetToMediaIfIndex(1)/InterfaceIndex/ASN_INTEGER/long(long)//l/a/w/e/R/d/H
     */
    netsnmp_variable_list var_inetNetToMediaIfIndex;
    /*
     * inetNetToMediaNetAddressType(2)/InetAddressType/ASN_INTEGER/long(u_long)//l/a/w/E/r/d/h
     */
    netsnmp_variable_list var_inetNetToMediaNetAddressType;
    /*
     * inetNetToMediaNetAddress(3)/InetAddress/ASN_OCTET_STR/char(char)//L/a/w/e/R/d/h
     */
    netsnmp_variable_list var_inetNetToMediaNetAddress;

    /*
     * set up varbinds
     */
    memset(&var_inetNetToMediaIfIndex, 0x00,
           sizeof(var_inetNetToMediaIfIndex));
    var_inetNetToMediaIfIndex.type = ASN_INTEGER;
    memset(&var_inetNetToMediaNetAddressType, 0x00,
           sizeof(var_inetNetToMediaNetAddressType));
    var_inetNetToMediaNetAddressType.type = ASN_INTEGER;
    memset(&var_inetNetToMediaNetAddress, 0x00,
           sizeof(var_inetNetToMediaNetAddress));
    var_inetNetToMediaNetAddress.type = ASN_OCTET_STR;

    /*
     * chain temp index varbinds together
     */
    var_inetNetToMediaIfIndex.next_variable =
        &var_inetNetToMediaNetAddressType;
    var_inetNetToMediaNetAddressType.next_variable =
        &var_inetNetToMediaNetAddress;
    var_inetNetToMediaNetAddress.next_variable = NULL;


    DEBUGMSGTL(("verbose:inetNetToMediaTable:inetNetToMediaTable_index_from_oid", "called\n"));

    /*
     * parse the oid into the individual index components
     */
    err = parse_oid_indexes(oid_idx->oids, oid_idx->len,
                            &var_inetNetToMediaIfIndex);
    if (err == SNMP_ERR_NOERROR) {
        /*
         * copy out values
         */
        mib_idx->inetNetToMediaIfIndex =
            *((long *) var_inetNetToMediaIfIndex.val.string);
        mib_idx->inetNetToMediaNetAddressType =
            *((u_long *) var_inetNetToMediaNetAddressType.val.string);
        /*
         * NOTE: val_len is in bytes, inetNetToMediaNetAddress_len might not be
         */
        if (var_inetNetToMediaNetAddress.val_len >
            sizeof(mib_idx->inetNetToMediaNetAddress))
            err = SNMP_ERR_GENERR;
        else {
            memcpy(mib_idx->inetNetToMediaNetAddress,
                   var_inetNetToMediaNetAddress.val.string,
                   var_inetNetToMediaNetAddress.val_len);
            mib_idx->inetNetToMediaNetAddress_len =
                var_inetNetToMediaNetAddress.val_len /
                sizeof(mib_idx->inetNetToMediaNetAddress[0]);
        }


    }

    /*
     * parsing may have allocated memory. free it.
     */
    snmp_reset_var_buffers(&var_inetNetToMediaIfIndex);

    return err;
}                               /* inetNetToMediaTable_index_from_oid */


/*
 *********************************************************************
 * @internal
 * allocate resources for a inetNetToMediaTable_rowreq_ctx
 */
inetNetToMediaTable_rowreq_ctx *
inetNetToMediaTable_allocate_rowreq_ctx(inetNetToMediaTable_data * data,
                                        void *user_init_ctx)
{
    inetNetToMediaTable_rowreq_ctx *rowreq_ctx =
        SNMP_MALLOC_TYPEDEF(inetNetToMediaTable_rowreq_ctx);

    DEBUGMSGTL(("internal:inetNetToMediaTable:inetNetToMediaTable_allocate_rowreq_ctx", "called\n"));

    if (NULL == rowreq_ctx) {
        snmp_log(LOG_ERR, "Couldn't allocate memory for a "
                 "inetNetToMediaTable_rowreq_ctx.\n");
        return NULL;
    } else {
        if (NULL != data) {
            /*
             * track if we got data from user
             */
            rowreq_ctx->rowreq_flags |= MFD_ROW_DATA_FROM_USER;
            rowreq_ctx->data = data;
        } else if (NULL ==
                   (rowreq_ctx->data =
                    inetNetToMediaTable_allocate_data())) {
            SNMP_FREE(rowreq_ctx);
            return NULL;
        }
    }

    /*
     * undo context will be allocated when needed (in *_undo_setup)
     */

    rowreq_ctx->oid_idx.oids = rowreq_ctx->oid_tmp;

    rowreq_ctx->inetNetToMediaTable_data_list = NULL;

    /*
     * if we allocated data, call init routine
     */
    if (!(rowreq_ctx->rowreq_flags & MFD_ROW_DATA_FROM_USER)) {
        if (SNMPERR_SUCCESS !=
            inetNetToMediaTable_rowreq_ctx_init(rowreq_ctx,
                                                user_init_ctx)) {
            inetNetToMediaTable_release_rowreq_ctx(rowreq_ctx);
            rowreq_ctx = NULL;
        }
    }

    return rowreq_ctx;
}                               /* inetNetToMediaTable_allocate_rowreq_ctx */

/*
 * @internal
 * release resources for a inetNetToMediaTable_rowreq_ctx
 */
void
inetNetToMediaTable_release_rowreq_ctx(inetNetToMediaTable_rowreq_ctx *
                                       rowreq_ctx)
{
    DEBUGMSGTL(("internal:inetNetToMediaTable:inetNetToMediaTable_release_rowreq_ctx", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    inetNetToMediaTable_rowreq_ctx_cleanup(rowreq_ctx);

    /*
     * for non-transient data, don't free data we got from the user
     */
    if ((rowreq_ctx->data) &&
        !(rowreq_ctx->rowreq_flags & MFD_ROW_DATA_FROM_USER))
        inetNetToMediaTable_release_data(rowreq_ctx->data);

    if (rowreq_ctx->undo)
        inetNetToMediaTable_release_data(rowreq_ctx->undo);

    /*
     * free index oid pointer
     */
    if (rowreq_ctx->oid_idx.oids != rowreq_ctx->oid_tmp)
        free(rowreq_ctx->oid_idx.oids);

    SNMP_FREE(rowreq_ctx);
}                               /* inetNetToMediaTable_release_rowreq_ctx */

/**
 * @internal
 * wrapper
 */
static int
_mfd_inetNetToMediaTable_pre_request(netsnmp_mib_handler *handler,
                                     netsnmp_handler_registration *reginfo,
                                     netsnmp_agent_request_info
                                     *agtreq_info,
                                     netsnmp_request_info *requests)
{
    int             rc;

    DEBUGMSGTL(("internal:inetNetToMediaTable:_mfd_inetNetToMediaTable_pre_request", "called\n"));

    if (1 != netsnmp_row_merge_status_first(reginfo, agtreq_info)) {
        DEBUGMSGTL(("internal:inetNetToMediaTable",
                    "skipping additional pre_request\n"));
        return SNMP_ERR_NOERROR;
    }

    rc = inetNetToMediaTable_pre_request(inetNetToMediaTable_if_ctx.
                                         user_ctx);
    if (MFD_SUCCESS != rc) {
        /*
         * nothing we can do about it but log it
         */
        DEBUGMSGTL(("inetNetToMediaTable", "error %d from "
                    "inetNetToMediaTable_pre_request\n", rc));
        netsnmp_request_set_error_all(requests, SNMP_VALIDATE_ERR(rc));
    }

    return SNMP_ERR_NOERROR;
}                               /* _mfd_inetNetToMediaTable_pre_request */

/**
 * @internal
 * wrapper
 */
static int
_mfd_inetNetToMediaTable_post_request(netsnmp_mib_handler *handler, netsnmp_handler_registration
                                      *reginfo, netsnmp_agent_request_info
                                      *agtreq_info,
                                      netsnmp_request_info *requests)
{
    inetNetToMediaTable_rowreq_ctx *rowreq_ctx =
        netsnmp_container_table_row_extract(requests);
    int             rc, packet_rc;

    DEBUGMSGTL(("internal:inetNetToMediaTable:_mfd_inetNetToMediaTable_post_request", "called\n"));

    /*
     * release row context, if deleted
     */
    if (rowreq_ctx && (rowreq_ctx->rowreq_flags & MFD_ROW_DELETED))
        inetNetToMediaTable_release_rowreq_ctx(rowreq_ctx);

    /*
     * wait for last call before calling user
     */
    if (1 != netsnmp_row_merge_status_last(reginfo, agtreq_info)) {
        DEBUGMSGTL(("internal:inetNetToMediaTable",
                    "waiting for last post_request\n"));
        return SNMP_ERR_NOERROR;
    }

    packet_rc = netsnmp_check_all_requests_error(agtreq_info->asp, 0);
    if ((MFD_SUCCESS != packet_rc) && inetNetToMediaTable_dirty_get()) {
        /*
         * we shouldn't get here. the undo steps should also clear
         * the dirty flags.
         */
        snmp_log(LOG_WARNING,
                 "inetNetToMediaTable dirty flag set in post_request "
                 "but status != SUCCESS.\n");
    }

    rc = inetNetToMediaTable_post_request(inetNetToMediaTable_if_ctx.
                                          user_ctx, packet_rc);
    if (MFD_SUCCESS != rc) {
        /*
         * nothing we can do about it but log it
         */
        DEBUGMSGTL(("inetNetToMediaTable", "error %d from "
                    "inetNetToMediaTable_post_request\n", rc));
    }

    return SNMP_ERR_NOERROR;
}                               /* _mfd_inetNetToMediaTable_post_request */

/**
 * @internal
 * wrapper
 */
static inetNetToMediaTable_rowreq_ctx *
_mfd_inetNetToMediaTable_rowreq_from_index(netsnmp_index * oid_idx,
                                           int *rc_ptr)
{
    inetNetToMediaTable_rowreq_ctx *rowreq_ctx;
    inetNetToMediaTable_mib_index mib_idx;
    int             rc;

    DEBUGMSGTL(("internal:inetNetToMediaTable:_mfd_inetNetToMediaTable_rowreq_from_index", "called\n"));

    if (NULL == rc_ptr)
        rc_ptr = &rc;
    *rc_ptr = MFD_SUCCESS;

    memset(&mib_idx, 0x0, sizeof(mib_idx));

    /*
     * try to parse oid
     */
    *rc_ptr = inetNetToMediaTable_index_from_oid(oid_idx, &mib_idx);
    if (MFD_SUCCESS != *rc_ptr) {
        DEBUGMSGT(("inetNetToMediaTable", "error parsing index\n"));
        return NULL;
    }

    /*
     * allocate new context
     */
    rowreq_ctx = inetNetToMediaTable_allocate_rowreq_ctx(NULL, NULL);
    if (NULL == rowreq_ctx) {
        *rc_ptr = MFD_ERROR;
        return NULL;            /* msg already logged */
    }

    memcpy(&rowreq_ctx->tbl_idx, &mib_idx, sizeof(mib_idx));

    /*
     * check indexes
     */
    *rc_ptr = _inetNetToMediaTable_check_indexes(rowreq_ctx);