125 lines
2.3 KiB
Ruby
125 lines
2.3 KiB
Ruby
require 'singleton'
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###
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#
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# Below are the various evasion levels. The HIGH level indicates that the
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# maximum level of evasion techniques should be used to assist in avoiding
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# detection. The rest can be inferred from there. Typically, the higher the
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# evasion level the greater the risk of failure due to increased complexity of
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# tasks.
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#
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###
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EVASION_HIGH = "high"
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EVASION_NORMAL = "normal"
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EVASION_LOW = "low"
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module Rex
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###
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#
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# This class provides a singleton interface to managing evasion levels on both
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# a global level and on a per-subsystem basis.
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#
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###
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class Evasion
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include Singleton
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@level = EVASION_NORMAL
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@subsys = {}
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##
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#
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# We default to a normal evasion level. This is typically enough to be
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# sane but not enough to introduce instabilities.
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#
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##
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#
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# Sets the global evasion level.
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#
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def self.set_level(lvl)
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@level = lvl
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end
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#
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# Returns the current global evasion level to the caller
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#
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def self.get_level
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@level
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end
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#
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# This method returns true if the evasion level is set to EVASION_HIGH, or
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# false if it is not.
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#
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def self.high?
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(get_level == EVASION_HIGH)
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end
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#
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# This method returns true if the evasion level is set to EVASION_NORMAL, or
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# false if it is not.
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#
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def self.normal?
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(get_level == EVASION_NORMAL)
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end
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#
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# This method returns true if the evasion level is set to EVASION_LOW, or
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# false if it is not.
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#
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def self.low?
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(get_level == EVASION_LOW)
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end
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#
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# Sets the evasion level for a given subsystem
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#
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def self.set_subsys_level(subsys, lvl)
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@subsys[subsys] = lvl
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end
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#
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# Returns the evasion level for a given subsystem. If the evasion level
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# hasn't been specified for the subsystem, the global evasion level is
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# returned.
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#
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def self.get_subsys_level(subsys)
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@subsys[subsys] || get_level
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end
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#
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# Resets the global and per-subsystem evasion levels to default.
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#
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def self.reset
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set_level(EVASION_NORMAL)
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@subsys = Hash.new
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end
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#
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# Registers the supplied subsystem so that it will show up in an
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# enumeration.
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#
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def self.register_subsys(subsys, evlvl = nil)
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@subsys[subsys] = evlvl
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end
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#
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# Removes the supplied subsystem.
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#
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def self.deregister_subsys(subsys)
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@subsys.delete(subsys)
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end
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#
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# Returns the hash of subsystems.
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#
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def self.subsys
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@subsys
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end
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end
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end
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