iftable_interface.c

snmp的源代码,已经在我的ubuntu下编译通过

        }                       /* for results */
    }

    return SNMP_ERR_NOERROR;
}                               /* _mfd_ifTable_undo_setup */

/**
 * @internal
 * undo setup
 */
int
_mfd_ifTable_undo_cleanup(netsnmp_mib_handler *handler,
                          netsnmp_handler_registration *reginfo,
                          netsnmp_agent_request_info *agtreq_info,
                          netsnmp_request_info *requests)
{
    ifTable_rowreq_ctx *rowreq_ctx =
        netsnmp_container_table_row_extract(requests);
    int             rc;

    DEBUGMSGTL(("internal:ifTable:_mfd_ifTable_undo_cleanup", "called\n"));

    /*
     * failed row create in early stages has no rowreq_ctx
     */
    if (NULL == rowreq_ctx)
        return MFD_SUCCESS;

    /*
     * call user cleanup
     */
    rc = ifTable_undo_cleanup(rowreq_ctx);
    if (MFD_SUCCESS != rc) {
        /*
         * nothing we can do about it but log it
         */
        DEBUGMSGTL(("verbose:ifTable:mfd", "error %d from "
                    "ifTable_undo_cleanup\n", rc));
    }

    /*
     * release undo context, if needed
     */
    if (rowreq_ctx->undo) {
        ifTable_release_data(rowreq_ctx->undo);
        rowreq_ctx->undo = NULL;
    }

    /*
     * clear set flags
     */
    rowreq_ctx->column_set_flags = 0;

    return SNMP_ERR_NOERROR;
}                               /* _mfd_ifTable_undo_cleanup */

/*----------------------------------------------------------------------
 *
 * SET: Set values
 *
 *---------------------------------------------------------------------*/
/*
 * @internal
 * Set the value for a particular column
 */
NETSNMP_STATIC_INLINE int
_ifTable_set_column(ifTable_rowreq_ctx * rowreq_ctx,
                    netsnmp_variable_list * var, int column)
{
    int             rc = SNMPERR_SUCCESS;

    DEBUGMSGTL(("internal:ifTable:_ifTable_set_column", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    switch (column) {

        /*
         * ifAdminStatus(7)/INTEGER/ASN_INTEGER/long(u_long)//l/A/W/E/r/d/h 
         */
    case COLUMN_IFADMINSTATUS:
        if (var->val_len != sizeof(u_long)) {
            rc = SNMP_ERR_WRONGLENGTH;
            snmp_log(LOG_ERR,
                     "varbind size of %d does not match expected size %d\n",
                     var->val_len, sizeof(u_long));
            break;
        }
        rowreq_ctx->column_set_flags |= FLAG_IFADMINSTATUS;
        rc = ifAdminStatus_set(rowreq_ctx, *((u_long *) var->val.string));
        break;

    default:
        snmp_log(LOG_ERR, "unknown column %d in _ifTable_set_column\n",
                 column);
        break;
    }

    return rc;
}                               /* _ifTable_set_column */

int
_mfd_ifTable_set_values(netsnmp_mib_handler *handler,
                        netsnmp_handler_registration *reginfo,
                        netsnmp_agent_request_info *agtreq_info,
                        netsnmp_request_info *requests)
{
    ifTable_rowreq_ctx *rowreq_ctx =
        netsnmp_container_table_row_extract(requests);
    netsnmp_table_request_info *tri;
    int             rc = SNMP_ERR_NOERROR;

    DEBUGMSGTL(("internal:ifTable:_mfd_ifTable_set_values", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    rowreq_ctx->column_set_flags = 0;
    for (; requests; requests = requests->next) {
        /*
         * set column data
         */
        tri = netsnmp_extract_table_info(requests);
        if (NULL == tri)
            continue;

        rc = _ifTable_set_column(rowreq_ctx,
                                 requests->requestvb, tri->colnum);
        if (MFD_SUCCESS != rc) {
            DEBUGMSGTL(("verbose:ifTable:mfd", "error %d from "
                        "ifTable_set_column\n", rc));
            netsnmp_set_request_error(agtreq_info, requests,
                                      SNMP_VALIDATE_ERR(rc));
        }
    }                           /* for results */

    return SNMP_ERR_NOERROR;
}                               /* _mfd_ifTable_set_values */

/*----------------------------------------------------------------------
 *
 * SET: commit
 *
 *---------------------------------------------------------------------*/
/**
 * @internal
 * commit the values
 */
int
_mfd_ifTable_commit(netsnmp_mib_handler *handler,
                    netsnmp_handler_registration *reginfo,
                    netsnmp_agent_request_info *agtreq_info,
                    netsnmp_request_info *requests)
{
    int             rc;
    ifTable_rowreq_ctx *rowreq_ctx =
        netsnmp_container_table_row_extract(requests);

    DEBUGMSGTL(("internal:ifTable:_mfd_ifTable_commit", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    rc = ifTable_commit(rowreq_ctx);
    if (MFD_SUCCESS != rc) {
        DEBUGMSGTL(("verbose:ifTable:mfd", "error %d from "
                    "ifTable_commit\n", rc));
        netsnmp_request_set_error_all(requests, SNMP_VALIDATE_ERR(rc));
    }

    return SNMP_ERR_NOERROR;
}

int
_mfd_ifTable_undo_commit(netsnmp_mib_handler *handler,
                         netsnmp_handler_registration *reginfo,
                         netsnmp_agent_request_info *agtreq_info,
                         netsnmp_request_info *requests)
{
    int             rc;
    ifTable_rowreq_ctx *rowreq_ctx =
        netsnmp_container_table_row_extract(requests);

    DEBUGMSGTL(("internal:ifTable:_mfd_ifTable_undo_commit", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    rc = ifTable_undo_commit(rowreq_ctx);
    if (MFD_SUCCESS != rc) {
        /*
         * nothing we can do about it but log it
         */
        DEBUGMSGTL(("verbose:ifTable:mfd", "error %d from "
                    "ifTable_undo_commit\n", rc));
    }

    return SNMP_ERR_NOERROR;
}                               /* _mfd_ifTable_commit */

/*----------------------------------------------------------------------
 *
 * SET: Undo
 *
 *---------------------------------------------------------------------*/
/**
 * @internal
 * undo the value for a particular column
 */
NETSNMP_STATIC_INLINE int
_ifTable_undo_column(ifTable_rowreq_ctx * rowreq_ctx,
                     netsnmp_variable_list * var, int column)
{
    int             rc = SNMPERR_SUCCESS;

    DEBUGMSGTL(("internal:ifTable:_ifTable_undo_column", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    switch (column) {

        /*
         * ifAdminStatus(7)/INTEGER/ASN_INTEGER/long(u_long)//l/A/W/E/r/d/h 
         */
    case COLUMN_IFADMINSTATUS:
        rc = ifAdminStatus_undo(rowreq_ctx);
        break;

    default:
        snmp_log(LOG_ERR, "unknown column %d in _ifTable_undo_column\n",
                 column);
        break;
    }

    return rc;
}                               /* _ifTable_undo_column */

int
_mfd_ifTable_undo_values(netsnmp_mib_handler *handler,
                         netsnmp_handler_registration *reginfo,
                         netsnmp_agent_request_info *agtreq_info,
                         netsnmp_request_info *requests)
{
    int             rc;
    ifTable_rowreq_ctx *rowreq_ctx =
        netsnmp_container_table_row_extract(requests);
    netsnmp_table_request_info *tri;

    DEBUGMSGTL(("internal:ifTable:_mfd_ifTable_undo_values", "called\n"));

    netsnmp_assert(NULL != rowreq_ctx);

    for (; requests; requests = requests->next) {
        /*
         * set column data
         */
        tri = netsnmp_extract_table_info(requests);
        if (NULL == tri)
            continue;

        rc = _ifTable_undo_column(rowreq_ctx, requests->requestvb,
                                  tri->colnum);
        if (MFD_SUCCESS != rc) {
            /*
             * nothing we can do about it but log it
             */
            DEBUGMSGTL(("verbose:ifTable:mfd", "error %d from "
                        "ifTable_undo_column\n", rc));
        }
    }                           /* for results */

    return SNMP_ERR_NOERROR;
}                               /* _mfd_ifTable_undo_values */

/***********************************************************************
 *
 * DATA ACCESS
 *
 ***********************************************************************/
/**
 * @internal
 */
static int
_cache_load(netsnmp_cache * cache, void *vmagic)
{
    DEBUGMSGTL(("internal:ifTable:_cache_load", "called\n"));

    if ((NULL == cache) || (NULL == cache->magic)) {
        snmp_log(LOG_ERR, "invalid cache for ifTable_cache_load\n");
        return -1;
    }

    /** should only be called for an invalid or expired cache */
    netsnmp_assert((0 == cache->valid) || (1 == cache->expired));

    /*
     * call user code
     */
    return ifTable_cache_load((netsnmp_container *) cache->magic);
}                               /* _cache_load */

/**
 * @internal
 */
static void
_cache_item_free(ifTable_rowreq_ctx * rowreq_ctx, void *context)
{
    DEBUGMSGTL(("internal:ifTable:_cache_item_free", "called\n"));

    if (NULL == rowreq_ctx)
        return;

    ifTable_release_rowreq_ctx(rowreq_ctx);
}                               /* _cache_item_free */

/**
 * @internal
 */
static void
_cache_free(netsnmp_cache * cache, void *magic)
{
    netsnmp_container *container;

    DEBUGMSGTL(("internal:ifTable:_cache_free", "called\n"));

    if ((NULL == cache) || (NULL == cache->magic)) {
        snmp_log(LOG_ERR, "invalid cache in ifTable_cache_free\n");
        return;
    }

    container = (netsnmp_container *) cache->magic;

    /*
     * call user code
     */
    ifTable_cache_free(container);

    /*
     * free all items. inefficient, but easy.
     */
    CONTAINER_CLEAR(container,
                    (netsnmp_container_obj_func *) _cache_item_free, NULL);
}                               /* _cache_free */

/**
 * @internal
 * initialize the iterator container with functions or wrappers
 */
void
_ifTable_container_init(ifTable_interface_ctx * if_ctx)
{
    DEBUGMSGTL(("internal:ifTable:_ifTable_container_init", "called\n"));

    /*
     * set up the cache
     */
    if_ctx->cache = netsnmp_cache_create(30,    /* timeout in seconds */
                                         _cache_load, _cache_free,
                                         ifTable_oid, ifTable_oid_size);

    if (NULL == if_ctx->cache) {
        snmp_log(LOG_ERR, "error creating cache for ifTable\n");
        return;
    }

    if_ctx->cache->flags = NETSNMP_CACHE_DONT_INVALIDATE_ON_SET;

    ifTable_container_init(&if_ctx->container, if_ctx->cache);
    if (NULL == if_ctx->container)
        if_ctx->container =
            netsnmp_container_find("ifTable:table_container");
    if (NULL == if_ctx->container) {
        snmp_log(LOG_ERR, "error creating container in "
                 "ifTable_container_init\n");
        return;
    }
    if_ctx->cache->magic = (void *) if_ctx->container;
}                               /* _ifTable_container_init */