qemu/include/qapi/opts-visitor.h
Laszlo Ersek 15a849be10 OptsVisitor: don't try to flatten overlong integer ranges
Prevent mistyped command line options from incurring high memory and CPU
usage at startup. 64K elements in a range should be enough for everyone
(TM).

The OPTS_VISITOR_RANGE_MAX macro is public so that unit tests can
construct corner cases with it.

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2013-08-20 11:52:00 -04:00

38 lines
1.1 KiB
C

/*
* Options Visitor
*
* Copyright Red Hat, Inc. 2012
*
* Author: Laszlo Ersek <lersek@redhat.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#ifndef OPTS_VISITOR_H
#define OPTS_VISITOR_H
#include "qapi/visitor.h"
#include "qemu/option.h"
/* Inclusive upper bound on the size of any flattened range. This is a safety
* (= anti-annoyance) measure; wrong ranges should not cause long startup
* delays nor exhaust virtual memory.
*/
#define OPTS_VISITOR_RANGE_MAX 65536
typedef struct OptsVisitor OptsVisitor;
/* Contrarily to qemu-option.c::parse_option_number(), OptsVisitor's "int"
* parser relies on strtoll() instead of strtoull(). Consequences:
* - string representations of negative numbers yield negative values,
* - values below INT64_MIN or LLONG_MIN are rejected,
* - values above INT64_MAX or LLONG_MAX are rejected.
*/
OptsVisitor *opts_visitor_new(const QemuOpts *opts);
void opts_visitor_cleanup(OptsVisitor *nv);
Visitor *opts_get_visitor(OptsVisitor *nv);
#endif