Object
Resolv::DNS performs DNS queries.
Dnsruby::DNS.new(config_info=nil)
((|config_info|)) should be nil, a string or a hash. If nil is given, /etc/resolv.conf and platform specific information is used. If a string is given, it should be a filename which format is same as /etc/resolv.conf. If a hash is given, it may contains information for nameserver, search and ndots as follows. Dnsruby::DNS.new({:nameserver=>["210.251.121.21"], :search=>["ruby-lang.org"], :ndots=>1})
Dnsruby::Resolv::DNS.open(config_info=nil) {|dns| …}
Dnsruby::DNS#each_address(name) {|address| ...}
address lookup methods. ((|name|)) must be an instance of Dnsruby::Name or String. Resultant address is represented as an instance of Dnsruby::IPv4 or Dnsruby::IPv6.
Dnsruby::DNS#each_name(address) {|name| ...}
These methods lookup hostnames . ((|address|)) must be an instance of Dnsruby::IPv4, Dnsruby::IPv6 or String. Resultant name is represented as an instance of Dnsruby::Name.
Dnsruby::DNS#getresource(name, type, class)
Dnsruby::DNS#getresources(name, type, class)
Dnsruby::DNS#each_resource(name, type, class) {|resource| ...}
These methods lookup DNS resources of ((|name|)). ((|name|)) must be a instance of Dnsruby::Name or String. ((|type|)) must be a member of Dnsruby::Types ((|class|)) must be a member of Dnsruby::Classes Resultant resource is represented as an instance of (a subclass of) Dnsruby::RR. (Dnsruby::RR::IN::A, etc.)
The searchlist and other Config info is applied to the domain name if appropriate. All the nameservers are tried (if there is no timely answer from the first).
This class uses Resolver to perform the queries.
Information taken from the following places :
STD0013
RFC 1035, etc.
etc.
Creates a new DNS resolver
config_info can be:
nil |
Uses platform default (e.g. /etc/resolv.conf) |
String |
Path to a file using /etc/resolv.conf’s format |
Hash |
Must contain :nameserver, :search and :ndots keys |
example : Dnsruby::DNS.new({:nameserver => ['210.251.121.21'], :search => ['ruby-lang.org'], :ndots => 1})
# File lib/Dnsruby/DNS.rb, line 118 def initialize(config_info=nil) @do_caching = true @config = Config.new() @config.set_config_info(config_info) @resolver = Resolver.new(@config) # if (@resolver.single_resolvers.length == 0) # raise ArgumentError.new("Must pass at least one valid resolver address") # end end
Closes the resolver
# File lib/Dnsruby/DNS.rb, line 97 def close @resolver.close end
Iterates over all IP addresses of name retrieved from the DNS resolver
name can be a Dnsruby::Name or a String. Retrieved address will be a Dnsruby::IPv4 or a Dnsruby::IPv6
# File lib/Dnsruby/DNS.rb, line 153 def each_address(name) each_resource(name) {|resource| yield resource.address} end
Iterates over all hostnames for address retrieved from the DNS resolver
address must be a Dnsruby::IPv4, Dnsruby::IPv6 or a String. Retrieved name will be a Dnsruby::Name.
# File lib/Dnsruby/DNS.rb, line 180 def each_name(address) case address when Name ptr = address when IPv4, IPv6 ptr = address.to_name when IPv4::Regex ptr = IPv4.create(address).to_name when IPv6::Regex ptr = IPv6.create(address).to_name else raise ResolvError.new("cannot interpret as address: #{address}") end each_resource(ptr, Types.PTR, Classes.IN) {|resource| yield resource.domainname} end
Iterates over all type, klass resources for name
type defaults to Dnsruby::Types.A klass defaults to Dnsruby::Classes.IN
Yielded resource is represented as a Dnsruby::RR instance, e.g. Dnsruby::RR::IN::A
# File lib/Dnsruby/DNS.rb, line 228 def each_resource(name, type=Types.A, klass=Classes.IN, &proc) type = Types.new(type) klass = Classes.new(klass) reply, reply_name = send_query(name, type, klass) case reply.rcode.code when RCode::NOERROR extract_resources(reply, reply_name, type, klass, &proc) return # when RCode::NXDomain # Dnsruby.log.debug("RCode::NXDomain returned - raising error") # raise Config::NXDomain.new(reply_name.to_s) else Dnsruby.log.error{"Unexpected rcode : #{reply.rcode.string}"} raise Config::OtherResolvError.new(reply_name.to_s) end end
Gets the first IP address of name from the DNS resolver
name can be a Dnsruby::Name or a String. Retrieved address will be a Dnsruby::IPv4 or a Dnsruby::IPv6
# File lib/Dnsruby/DNS.rb, line 134 def getaddress(name) each_address(name) {|address| return address} raise ResolvError.new("DNS result has no information for #{name}") end
Gets all IP addresses of name from the DNS resolver
name can be a Dnsruby::Name or a String. Retrieved address will be a Dnsruby::IPv4 or a Dnsruby::IPv6
# File lib/Dnsruby/DNS.rb, line 143 def getaddresses(name) ret = [] each_address(name) {|address| ret << address} return ret end
Gets the first hostname for address from the DNS resolver
address must be a Dnsruby::IPv4, Dnsruby::IPv6 or a String. Retrieved name will be a Dnsruby::Name.
# File lib/Dnsruby/DNS.rb, line 161 def getname(address) each_name(address) {|name| return name} raise ResolvError.new("DNS result has no information for #{address}") end
Gets all hostnames for address from the DNS resolver
address must be a Dnsruby::IPv4, Dnsruby::IPv6 or a String. Retrieved name will be a Dnsruby::Name.
# File lib/Dnsruby/DNS.rb, line 170 def getnames(address) ret = [] each_name(address) {|name| ret << name} return ret end
Look up the first type, klass resource for name
type defaults to Dnsruby::Types.A klass defaults to Dnsruby::Classes.IN
Returned resource is represented as a Dnsruby::RR instance, e.g. Dnsruby::RR::IN::A
# File lib/Dnsruby/DNS.rb, line 203 def getresource(name, type=Types.A, klass=Classes.IN) each_resource(name, type, klass) {|resource| return resource} raise ResolvError.new("DNS result has no information for #{name}") end
Look up all type, klass resources for name
type defaults to Dnsruby::Types.A klass defaults to Dnsruby::Classes.IN
Returned resource is represented as a Dnsruby::RR instance, e.g. Dnsruby::RR::IN::A
# File lib/Dnsruby/DNS.rb, line 215 def getresources(name, type=Types.A, klass=Classes.IN) ret = [] each_resource(name, type, klass) {|resource| ret << resource} return ret end
Generated with the Darkfish Rdoc Generator 2.