# frozen_string_literal: true

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require 'socket'

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require 'timeout'

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require 'io/wait'

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begin

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require 'securerandom'

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rescue LoadError

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end

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# Resolv is a thread-aware DNS resolver library written in Ruby. Resolv can

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# handle multiple DNS requests concurrently without blocking the entire Ruby

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# interpreter.

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#

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# See also resolv-replace.rb to replace the libc resolver with Resolv.

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#

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# Resolv can look up various DNS resources using the DNS module directly.

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#

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# Examples:

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#

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# p Resolv.getaddress "www.ruby-lang.org"

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# p Resolv.getname "210.251.121.214"

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#

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# Resolv::DNS.open do |dns|

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# ress = dns.getresources "www.ruby-lang.org", Resolv::DNS::Resource::IN::A

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# p ress.map(&:address)

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# ress = dns.getresources "ruby-lang.org", Resolv::DNS::Resource::IN::MX

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# p ress.map { |r| [r.exchange.to_s, r.preference] }

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# end

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#

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#

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# == Bugs

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#

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# * NIS is not supported.

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# * /etc/nsswitch.conf is not supported.

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class Resolv

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##

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# Looks up the first IP address for +name+.

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def self.getaddress(name)

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DefaultResolver.getaddress(name)

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end

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##

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# Looks up all IP address for +name+.

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def self.getaddresses(name)

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DefaultResolver.getaddresses(name)

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end

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##

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# Iterates over all IP addresses for +name+.

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def self.each_address(name, &block)

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DefaultResolver.each_address(name, &block)

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end

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##

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# Looks up the hostname of +address+.

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def self.getname(address)

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DefaultResolver.getname(address)

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end

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##

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# Looks up all hostnames for +address+.

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def self.getnames(address)

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DefaultResolver.getnames(address)

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end

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##

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# Iterates over all hostnames for +address+.

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def self.each_name(address, &proc)

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DefaultResolver.each_name(address, &proc)

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end

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##

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# Creates a new Resolv using +resolvers+.

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def initialize(resolvers=[Hosts.new, DNS.new])

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@resolvers = resolvers

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end

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##

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# Looks up the first IP address for +name+.

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def getaddress(name)

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each_address(name) {|address| return address}

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raise ResolvError.new("no address for #{name}")

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end

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##

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# Looks up all IP address for +name+.

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def getaddresses(name)

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ret = []

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each_address(name) {|address| ret << address}

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return ret

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end

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##

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# Iterates over all IP addresses for +name+.

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def each_address(name)

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if AddressRegex =~ name

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yield name

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return

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end

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yielded = false

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@resolvers.each {|r|

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r.each_address(name) {|address|

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yield address.to_s

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yielded = true

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}

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return if yielded

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}

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end

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##

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# Looks up the hostname of +address+.

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def getname(address)

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each_name(address) {|name| return name}

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raise ResolvError.new("no name for #{address}")

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end

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##

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# Looks up all hostnames for +address+.

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def getnames(address)

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ret = []

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each_name(address) {|name| ret << name}

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return ret

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end

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##

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# Iterates over all hostnames for +address+.

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def each_name(address)

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yielded = false

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@resolvers.each {|r|

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r.each_name(address) {|name|

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yield name.to_s

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yielded = true

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}

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return if yielded

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}

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end

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##

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# Indicates a failure to resolve a name or address.

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class ResolvError < StandardError; end

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##

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# Indicates a timeout resolving a name or address.

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class ResolvTimeout < Timeout::Error; end

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##

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# Resolv::Hosts is a hostname resolver that uses the system hosts file.

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class Hosts

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if /mswin|mingw|cygwin/ =~ RUBY_PLATFORM and

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begin

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require 'win32/resolv'

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DefaultFileName = Win32::Resolv.get_hosts_path || IO::NULL

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rescue LoadError

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end

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end

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DefaultFileName ||= '/etc/hosts'

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##

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# Creates a new Resolv::Hosts, using +filename+ for its data source.

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def initialize(filename = DefaultFileName)

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@filename = filename

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@mutex = Thread::Mutex.new

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@initialized = nil

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end

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def lazy_initialize # :nodoc:

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@mutex.synchronize {

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unless @initialized

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@name2addr = {}

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@addr2name = {}

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File.open(@filename, 'rb') {|f|

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f.each {|line|

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line.sub!(/#.*/, '')

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addr, hostname, *aliases = line.split(/\s+/)

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next unless addr

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@addr2name[addr] = [] unless @addr2name.include? addr

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@addr2name[addr] << hostname

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@addr2name[addr] += aliases

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@name2addr[hostname] = [] unless @name2addr.include? hostname

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@name2addr[hostname] << addr

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aliases.each {|n|

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@name2addr[n] = [] unless @name2addr.include? n

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@name2addr[n] << addr

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}

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}

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}

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@name2addr.each {|name, arr| arr.reverse!}

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@initialized = true

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end

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}

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self

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end

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##

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# Gets the IP address of +name+ from the hosts file.

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def getaddress(name)

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each_address(name) {|address| return address}

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raise ResolvError.new("#{@filename} has no name: #{name}")

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end

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##

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# Gets all IP addresses for +name+ from the hosts file.

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def getaddresses(name)

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ret = []

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each_address(name) {|address| ret << address}

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return ret

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end

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##

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# Iterates over all IP addresses for +name+ retrieved from the hosts file.

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def each_address(name, &proc)

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lazy_initialize

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@name2addr[name]&.each(&proc)

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end

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##

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# Gets the hostname of +address+ from the hosts file.

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def getname(address)

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each_name(address) {|name| return name}

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raise ResolvError.new("#{@filename} has no address: #{address}")

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end

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##

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# Gets all hostnames for +address+ from the hosts file.

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def getnames(address)

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ret = []

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each_name(address) {|name| ret << name}

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return ret

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end

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##

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# Iterates over all hostnames for +address+ retrieved from the hosts file.

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def each_name(address, &proc)

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lazy_initialize

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@addr2name[address]&.each(&proc)

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end

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end

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##

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# Resolv::DNS is a DNS stub resolver.

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#

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# Information taken from the following places:

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#

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# * STD0013

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# * RFC 1035

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# * ftp://ftp.isi.edu/in-notes/iana/assignments/dns-parameters

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# * etc.

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class DNS

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##

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# Default DNS Port

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Port = 53

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##

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# Default DNS UDP packet size

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UDPSize = 512

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##

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# Creates a new DNS resolver. See Resolv::DNS.new for argument details.

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#

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# Yields the created DNS resolver to the block, if given, otherwise

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# returns it.

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def self.open(*args)

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dns = new(*args)

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return dns unless block_given?

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begin

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yield dns

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ensure

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dns.close

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end

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end

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##

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# Creates a new DNS resolver.

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#

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# +config_info+ can be:

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#

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# nil:: Uses /etc/resolv.conf.

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# String:: Path to a file using /etc/resolv.conf's format.

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# Hash:: Must contain :nameserver, :search and :ndots keys.

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# :nameserver_port can be used to specify port number of nameserver address.

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#

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# The value of :nameserver should be an address string or

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# an array of address strings.

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# - :nameserver => '8.8.8.8'

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# - :nameserver => ['8.8.8.8', '8.8.4.4']

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#

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# The value of :nameserver_port should be an array of

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# pair of nameserver address and port number.

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# - :nameserver_port => [['8.8.8.8', 53], ['8.8.4.4', 53]]

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#

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# Example:

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#

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# Resolv::DNS.new(:nameserver => ['210.251.121.21'],

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# :search => ['ruby-lang.org'],

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# :ndots => 1)

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def initialize(config_info=nil)

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@mutex = Thread::Mutex.new

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@config = Config.new(config_info)

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@initialized = nil

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end

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# Sets the resolver timeouts. This may be a single positive number

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# or an array of positive numbers representing timeouts in seconds.

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# If an array is specified, a DNS request will retry and wait for

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# each successive interval in the array until a successful response

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# is received. Specifying +nil+ reverts to the default timeouts:

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# [ 5, second = 5 * 2 / nameserver_count, 2 * second, 4 * second ]

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#

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# Example:

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#

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# dns.timeouts = 3

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#

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def timeouts=(values)

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@config.timeouts = values

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end

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def lazy_initialize # :nodoc:

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@mutex.synchronize {

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unless @initialized

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@config.lazy_initialize

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@initialized = true

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end

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}

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self

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end

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##

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# Closes the DNS resolver.

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def close

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@mutex.synchronize {

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if @initialized

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@initialized = false

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end

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}

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end

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##

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# Gets the IP address of +name+ from the DNS resolver.

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#

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# +name+ can be a Resolv::DNS::Name or a String. Retrieved address will

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# be a Resolv::IPv4 or Resolv::IPv6

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def getaddress(name)

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each_address(name) {|address| return address}

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raise ResolvError.new("DNS result has no information for #{name}")

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end

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##

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# Gets all IP addresses for +name+ from the DNS resolver.

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#

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# +name+ can be a Resolv::DNS::Name or a String. Retrieved addresses will

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# be a Resolv::IPv4 or Resolv::IPv6

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def getaddresses(name)

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ret = []

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each_address(name) {|address| ret << address}

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return ret

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end

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##

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# Iterates over all IP addresses for +name+ retrieved from the DNS

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# resolver.

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#

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# +name+ can be a Resolv::DNS::Name or a String. Retrieved addresses will

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# be a Resolv::IPv4 or Resolv::IPv6

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def each_address(name)

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each_resource(name, Resource::IN::A) {|resource| yield resource.address}

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if use_ipv6?

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each_resource(name, Resource::IN::AAAA) {|resource| yield resource.address}

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end

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end

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def use_ipv6? # :nodoc:

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begin

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list = Socket.ip_address_list

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rescue NotImplementedError

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return true

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end

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list.any? {|a| a.ipv6? && !a.ipv6_loopback? && !a.ipv6_linklocal? }

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end

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private :use_ipv6?

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##

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# Gets the hostname for +address+ from the DNS resolver.

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#

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# +address+ must be a Resolv::IPv4, Resolv::IPv6 or a String. Retrieved

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# name will be a Resolv::DNS::Name.

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def getname(address)

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each_name(address) {|name| return name}

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raise ResolvError.new("DNS result has no information for #{address}")

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end

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##

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# Gets all hostnames for +address+ from the DNS resolver.

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#

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# +address+ must be a Resolv::IPv4, Resolv::IPv6 or a String. Retrieved

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# names will be Resolv::DNS::Name instances.

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def getnames(address)

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ret = []

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each_name(address) {|name| ret << name}

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return ret

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end

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##

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# Iterates over all hostnames for +address+ retrieved from the DNS

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# resolver.

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#

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# +address+ must be a Resolv::IPv4, Resolv::IPv6 or a String. Retrieved

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# names will be Resolv::DNS::Name instances.

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def each_name(address)

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case address

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when Name

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ptr = address

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when IPv4, IPv6

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ptr = address.to_name

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when IPv4::Regex

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ptr = IPv4.create(address).to_name

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when IPv6::Regex

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ptr = IPv6.create(address).to_name

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else

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raise ResolvError.new("cannot interpret as address: #{address}")

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end

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each_resource(ptr, Resource::IN::PTR) {|resource| yield resource.name}

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end

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##

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# Look up the +typeclass+ DNS resource of +name+.

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#

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# +name+ must be a Resolv::DNS::Name or a String.

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#

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# +typeclass+ should be one of the following:

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#

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# * Resolv::DNS::Resource::IN::A

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# * Resolv::DNS::Resource::IN::AAAA

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# * Resolv::DNS::Resource::IN::ANY

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# * Resolv::DNS::Resource::IN::CNAME

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# * Resolv::DNS::Resource::IN::HINFO

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# * Resolv::DNS::Resource::IN::MINFO

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# * Resolv::DNS::Resource::IN::MX

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# * Resolv::DNS::Resource::IN::NS

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# * Resolv::DNS::Resource::IN::PTR

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# * Resolv::DNS::Resource::IN::SOA

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# * Resolv::DNS::Resource::IN::TXT

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# * Resolv::DNS::Resource::IN::WKS

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#

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# Returned resource is represented as a Resolv::DNS::Resource instance,

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# i.e. Resolv::DNS::Resource::IN::A.

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def getresource(name, typeclass)

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each_resource(name, typeclass) {|resource| return resource}

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raise ResolvError.new("DNS result has no information for #{name}")

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end

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##

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# Looks up all +typeclass+ DNS resources for +name+. See #getresource for

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# argument details.

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def getresources(name, typeclass)

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ret = []

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each_resource(name, typeclass) {|resource| ret << resource}

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return ret

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end

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