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15a849be10
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>
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
/*
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* Options Visitor
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*
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* Copyright Red Hat, Inc. 2012
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*
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* Author: Laszlo Ersek <lersek@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#ifndef OPTS_VISITOR_H
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#define OPTS_VISITOR_H
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#include "qapi/visitor.h"
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#include "qemu/option.h"
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/* Inclusive upper bound on the size of any flattened range. This is a safety
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* (= anti-annoyance) measure; wrong ranges should not cause long startup
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* delays nor exhaust virtual memory.
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*/
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#define OPTS_VISITOR_RANGE_MAX 65536
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typedef struct OptsVisitor OptsVisitor;
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/* Contrarily to qemu-option.c::parse_option_number(), OptsVisitor's "int"
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* parser relies on strtoll() instead of strtoull(). Consequences:
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* - string representations of negative numbers yield negative values,
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* - values below INT64_MIN or LLONG_MIN are rejected,
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* - values above INT64_MAX or LLONG_MAX are rejected.
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*/
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OptsVisitor *opts_visitor_new(const QemuOpts *opts);
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void opts_visitor_cleanup(OptsVisitor *nv);
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Visitor *opts_get_visitor(OptsVisitor *nv);
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#endif
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