Class: Resolv::DNS::Config
- Inherits:
-
Object
- Object
- Resolv::DNS::Config
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- Defined in:
- lib/resolv.rb
Overview
Defined Under Namespace
Classes: NXDomain, OtherResolvError
Constant Summary
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- InitialTimeout =
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Class Method Summary
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Instance Method Summary
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Constructor Details
#initialize(config_info = nil) ⇒ Config
Returns a new instance of Config.
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# File 'lib/resolv.rb', line 850
def initialize(config_info=nil)
@mutex = Mutex.new
@config_info = config_info
@initialized = nil
end
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Class Method Details
.default_config_hash(filename = "/etc/resolv.conf") ⇒ Object
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# File 'lib/resolv.rb', line 890
def Config.default_config_hash(filename="/etc/resolv.conf")
if File.exist? filename
config_hash = Config.parse_resolv_conf(filename)
else
if /mswin|cygwin|mingw|bccwin/ =~ RUBY_PLATFORM
require 'win32/resolv'
search, nameserver = Win32::Resolv.get_resolv_info
config_hash = {}
config_hash[:nameserver] = nameserver if nameserver
config_hash[:search] = [search].flatten if search
end
end
config_hash || {}
end
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.parse_resolv_conf(filename) ⇒ Object
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# File 'lib/resolv.rb', line 856
def Config.parse_resolv_conf(filename)
nameserver = []
search = nil
ndots = 1
open(filename) {|f|
f.each {|line|
line.sub!(/[#;].*/, '')
keyword, *args = line.split(/\s+/)
args.each { |arg|
arg.untaint
}
next unless keyword
case keyword
when 'nameserver'
nameserver += args
when 'domain'
next if args.empty?
search = [args[0]]
when 'search'
next if args.empty?
search = args
when 'options'
args.each {|arg|
case arg
when /\Andots:(\d+)\z/
ndots = $1.to_i
end
}
end
}
}
return { :nameserver => nameserver, :search => search, :ndots => ndots }
end
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Instance Method Details
#generate_candidates(name) ⇒ Object
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# File 'lib/resolv.rb', line 988
def generate_candidates(name)
candidates = nil
name = Name.create(name)
if name.absolute?
candidates = [name]
else
if @ndots <= name.length - 1
candidates = [Name.new(name.to_a)]
else
candidates = []
end
candidates.concat(@search.map {|domain| Name.new(name.to_a + domain)})
end
return candidates
end
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#generate_timeouts ⇒ Object
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# File 'lib/resolv.rb', line 1006
def generate_timeouts
ts = [InitialTimeout]
ts << ts[-1] * 2 / @nameserver_port.length
ts << ts[-1] * 2
ts << ts[-1] * 2
return ts
end
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#lazy_initialize ⇒ Object
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# File 'lib/resolv.rb', line 905
def lazy_initialize
@mutex.synchronize {
unless @initialized
@nameserver_port = []
@search = nil
@ndots = 1
case @config_info
when nil
config_hash = Config.default_config_hash
when String
config_hash = Config.parse_resolv_conf(@config_info)
when Hash
config_hash = @config_info.dup
if String === config_hash[:nameserver]
config_hash[:nameserver] = [config_hash[:nameserver]]
end
if String === config_hash[:search]
config_hash[:search] = [config_hash[:search]]
end
else
raise ArgumentError.new("invalid resolv configuration: #{@config_info.inspect}")
end
if config_hash.include? :nameserver
@nameserver_port = config_hash[:nameserver].map {|ns| [ns, Port] }
end
if config_hash.include? :nameserver_port
@nameserver_port = config_hash[:nameserver_port].map {|ns, port| [ns, (port || Port)] }
end
@search = config_hash[:search] if config_hash.include? :search
@ndots = config_hash[:ndots] if config_hash.include? :ndots
if @nameserver_port.empty?
@nameserver_port << ['0.0.0.0', Port]
end
if @search
@search = @search.map {|arg| Label.split(arg) }
else
hostname = Socket.gethostname
if /\./ =~ hostname
@search = [Label.split($')]
else
@search = [[]]
end
end
if !@nameserver_port.kind_of?(Array) ||
@nameserver_port.any? {|ns_port|
!(Array === ns_port) ||
ns_port.length != 2
!(String === ns_port[0]) ||
!(Integer === ns_port[1])
}
raise ArgumentError.new("invalid nameserver config: #{@nameserver_port.inspect}")
end
if !@search.kind_of?(Array) ||
!@search.all? {|ls| ls.all? {|l| Label::Str === l } }
raise ArgumentError.new("invalid search config: #{@search.inspect}")
end
if !@ndots.kind_of?(Integer)
raise ArgumentError.new("invalid ndots config: #{@ndots.inspect}")
end
@initialized = true
end
}
self
end
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#nameserver_port ⇒ Object
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# File 'lib/resolv.rb', line 984
def nameserver_port
@nameserver_port
end
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#resolv(name) ⇒ Object
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# File 'lib/resolv.rb', line 1014
def resolv(name)
candidates = generate_candidates(name)
timeouts = generate_timeouts
begin
candidates.each {|candidate|
begin
timeouts.each {|tout|
@nameserver_port.each {|nameserver, port|
begin
yield candidate, tout, nameserver, port
rescue ResolvTimeout
end
}
}
raise ResolvError.new("DNS resolv timeout: #{name}")
rescue NXDomain
end
}
rescue ResolvError
end
end
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#single? ⇒ Boolean
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# File 'lib/resolv.rb', line 975
def single?
lazy_initialize
if @nameserver_port.length == 1
return @nameserver_port[0]
else
return nil
end
end
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