objectaccess.c

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/* -------------------------------------------------------------------------
 *
 * objectaccess.c
 *      functions for object_access_hook on various events
 *
 * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * -------------------------------------------------------------------------
 */
#include "postgres.h"

#include "catalog/objectaccess.h"
#include "catalog/pg_class.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_proc.h"

/*
 * Hook on object accesses.  This is intended as infrastructure for security
 * and logging plugins.
 */
object_access_hook_type object_access_hook = NULL;

/*
 * RunObjectPostCreateHook
 *
 * It is entrypoint of OAT_POST_CREATE event
 */
void
RunObjectPostCreateHook(Oid classId, Oid objectId, int subId,
                        bool is_internal)
{
    ObjectAccessPostCreate pc_arg;

    /* caller should check, but just in case... */
    Assert(object_access_hook != NULL);

    memset(&pc_arg, 0, sizeof(ObjectAccessPostCreate));
    pc_arg.is_internal = is_internal;

    (*object_access_hook) (OAT_POST_CREATE,
                           classId, objectId, subId,
                           (void *) &pc_arg);
}

/*
 * RunObjectDropHook
 *
 * It is entrypoint of OAT_DROP event
 */
void
RunObjectDropHook(Oid classId, Oid objectId, int subId,
                  int dropflags)
{
    ObjectAccessDrop drop_arg;

    /* caller should check, but just in case... */
    Assert(object_access_hook != NULL);

    memset(&drop_arg, 0, sizeof(ObjectAccessDrop));
    drop_arg.dropflags = dropflags;

    (*object_access_hook) (OAT_DROP,
                           classId, objectId, subId,
                           (void *) &drop_arg);
}

/*
 * RunObjectTruncateHook
 *
 * It is the entrypoint of OAT_TRUNCATE event
 */
void
RunObjectTruncateHook(Oid objectId)
{
    /* caller should check, but just in case... */
    Assert(object_access_hook != NULL);

    (*object_access_hook) (OAT_TRUNCATE,
                           RelationRelationId, objectId, 0,
                           NULL);
}

/*
 * RunObjectPostAlterHook
 *
 * It is entrypoint of OAT_POST_ALTER event
 */
void
RunObjectPostAlterHook(Oid classId, Oid objectId, int subId,
                       Oid auxiliaryId, bool is_internal)
{
    ObjectAccessPostAlter pa_arg;

    /* caller should check, but just in case... */
    Assert(object_access_hook != NULL);

    memset(&pa_arg, 0, sizeof(ObjectAccessPostAlter));
    pa_arg.auxiliary_id = auxiliaryId;
    pa_arg.is_internal = is_internal;

    (*object_access_hook) (OAT_POST_ALTER,
                           classId, objectId, subId,
                           (void *) &pa_arg);
}

/*
 * RunNamespaceSearchHook
 *
 * It is entrypoint of OAT_NAMESPACE_SEARCH event
 */
bool
RunNamespaceSearchHook(Oid objectId, bool ereport_on_violation)
{
    ObjectAccessNamespaceSearch ns_arg;

    /* caller should check, but just in case... */
    Assert(object_access_hook != NULL);

    memset(&ns_arg, 0, sizeof(ObjectAccessNamespaceSearch));
    ns_arg.ereport_on_violation = ereport_on_violation;
    ns_arg.result = true;

    (*object_access_hook) (OAT_NAMESPACE_SEARCH,
                           NamespaceRelationId, objectId, 0,
                           (void *) &ns_arg);

    return ns_arg.result;
}

/*
 * RunFunctionExecuteHook
 *
 * It is entrypoint of OAT_FUNCTION_EXECUTE event
 */
void
RunFunctionExecuteHook(Oid objectId)
{
    /* caller should check, but just in case... */
    Assert(object_access_hook != NULL);

    (*object_access_hook) (OAT_FUNCTION_EXECUTE,
                           ProcedureRelationId, objectId, 0,
                           NULL);
}