Class: Dnsruby::PacketSender
- Inherits:
-
Object
- Object
- Dnsruby::PacketSender
- Defined in:
- lib/dnsruby/packet_sender.rb
Overview
:nodoc: all
Constant Summary collapse
Instance Attribute Summary collapse
-
#dnssec ⇒ Object
Use DNSSEC for this PacketSender dnssec defaults to ON.
-
#ignore_truncation ⇒ Object
Don’t worry if the response is truncated - return it anyway.
-
#no_tcp ⇒ Object
Use UDP only - don’t use TCP For test/debug purposes only Defaults to false.
-
#packet_timeout ⇒ Object
Returns the value of attribute packet_timeout.
-
#port ⇒ Object
The port on the resolver to send queries to.
-
#recurse ⇒ Object
should the Recursion Desired bit be set on queries?.
-
#server ⇒ Object
The address of the resolver to send queries to.
-
#src_address ⇒ Object
The source address to send queries from.
-
#tsig ⇒ Object
The TSIG record to sign/verify messages with.
-
#udp_size ⇒ Object
The max UDP packet size.
-
#use_tcp ⇒ Object
Use TCP rather than UDP as the transport.
Class Method Summary collapse
- .cache(query, response) ⇒ Object
- .cache_authoritative(answer) ⇒ Object
- .cache_recursive(answer) ⇒ Object
- .clear_caches ⇒ Object
Instance Method Summary collapse
- #add_opt_rr(packet) ⇒ Object
-
#add_src_port(p) ⇒ Object
Can be a single Fixnum or a Range or an Array If an invalid port is selected (one reserved by IANA), then an ArgumentError will be raised.
- #check_ipv6 ⇒ Object
- #check_response(response, response_bytes, query, client_queue, client_query_id, tcp) ⇒ Object
- #check_tsig(query, response, response_bytes) ⇒ Object
- #close ⇒ Object
- #get_next_src_port ⇒ Object
-
#initialize(*args) ⇒ PacketSender
constructor
Can take a hash with the following optional keys :.
- #make_query(name, type = Types::A, klass = Classes::IN, set_cd = @dnssec) ⇒ Object
-
#make_query_packet(packet, use_tcp = @use_tcp) ⇒ Object
Prepare the packet for sending.
- #prepare_for_dnssec(packet) ⇒ Object
-
#send_async(*args) ⇒ Object
Asynchronously send a Message to the server.
-
#send_dnsruby(query_bytes, query, client_query_id, client_queue, use_tcp) ⇒ Object
This method sends the packet using the built-in pure Ruby event loop, with no dependencies.
-
#src_address6=(arg) ⇒ Object
Set the source address.
-
#src_port ⇒ Object
The source port to send queries from Returns either a single Fixnum or an Array e.g.
-
#src_port=(p) ⇒ Object
Can be a single Fixnum or a Range or an Array If an invalid port is selected (one reserved by IANA), then an ArgumentError will be raised.
-
#udp_packet_size ⇒ Object
Return the packet size to use for UDP.
Constructor Details
#initialize(*args) ⇒ PacketSender
Can take a hash with the following optional keys :
* :server
* :port
* :use_tcp
* :no_tcp
* :ignore_truncation
* :src_address
* :src_address6
* :src_port
* :udp_size
* :tsig
* :packet_timeout
* :recurse
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# File 'lib/dnsruby/packet_sender.rb', line 170 def initialize(*args) arg=args[0] @ipv6 = false @packet_timeout = Resolver::DefaultPacketTimeout @port = Resolver::DefaultPort @udp_size = Resolver::DefaultUDPSize @dnssec = Resolver::DefaultDnssec @use_tcp = false @no_tcp = false @tsig = nil @ignore_truncation = false @src_address = '0.0.0.0' @src_address6 = '::' @src_port = [0] @recurse = true if (arg==nil) # Get default config config = Config.new # @server = config.nameserver[0] elsif (arg.kind_of? String) @server=arg elsif (arg.kind_of? Name) @server=arg elsif (arg.kind_of? Hash) arg.keys.each do |attr| begin if (((attr.to_s == "src_address")||(attr.to_s == "src_address6")) && ((arg[attr] == nil) || (arg[attr] == ""))) else send(attr.to_s+"=", arg[attr]) end rescue Exception => e Dnsruby.log.error { "PacketSender : Argument #{attr}, #{arg[attr]} not valid : #{e}\n" } end # end end end # Check server is IP @server=Config.resolve_server(@server) check_ipv6 # ResolverRegister::register_single_resolver(self) end |
Instance Attribute Details
#dnssec ⇒ Object
Use DNSSEC for this PacketSender
dnssec defaults to ON
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# File 'lib/dnsruby/packet_sender.rb', line 106 def dnssec @dnssec end |
#ignore_truncation ⇒ Object
Don’t worry if the response is truncated - return it anyway.
Defaults to false
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# File 'lib/dnsruby/packet_sender.rb', line 84 def ignore_truncation @ignore_truncation end |
#no_tcp ⇒ Object
Use UDP only - don’t use TCP
For test/debug purposes only
Defaults to false
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# File 'lib/dnsruby/packet_sender.rb', line 76 def no_tcp @no_tcp end |
#packet_timeout ⇒ Object
Returns the value of attribute packet_timeout.
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# File 'lib/dnsruby/packet_sender.rb', line 61 def packet_timeout @packet_timeout end |
#port ⇒ Object
The port on the resolver to send queries to.
Defaults to 53
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# File 'lib/dnsruby/packet_sender.rb', line 66 def port @port end |
#recurse ⇒ Object
should the Recursion Desired bit be set on queries?
Defaults to true
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# File 'lib/dnsruby/packet_sender.rb', line 94 def recurse @recurse end |
#server ⇒ Object
The address of the resolver to send queries to
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# File 'lib/dnsruby/packet_sender.rb', line 102 def server @server end |
#src_address ⇒ Object
The source address to send queries from
Defaults to localhost
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# File 'lib/dnsruby/packet_sender.rb', line 89 def src_address @src_address end |
#tsig ⇒ Object
The TSIG record to sign/verify messages with
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# File 'lib/dnsruby/packet_sender.rb', line 79 def tsig @tsig end |
#udp_size ⇒ Object
The max UDP packet size
Defaults to 512
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# File 'lib/dnsruby/packet_sender.rb', line 99 def udp_size @udp_size end |
#use_tcp ⇒ Object
Use TCP rather than UDP as the transport.
Defaults to false
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# File 'lib/dnsruby/packet_sender.rb', line 71 def use_tcp @use_tcp end |
Class Method Details
.cache(query, response) ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 25 def PacketSender.cache(query, response) return if response.cached # ONLY cache the response if it is not an update response question = query.question()[0] if (query.do_caching && (query.class != Update) && (question.qtype != Types::AXFR) && (question.qtype != Types::IXFR) && (response.rcode == RCode::NOERROR) &&(!response.tsig) && (query.class != Update) && (response.header.ancount > 0)) # # @TODO@ What about TSIG-signed responses? # Don't cache any packets with "*" in the query name! (RFC1034 sec 4.3.3) if (!question.qname.to_s.include? "*") # Now cache response RRSets if (query.header.rd) PacketSender.cache_recursive(response); else PacketSender.(response); end end end end |
.cache_authoritative(answer) ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 47 def PacketSender.(answer) return if !answer.header.aa @@authoritative_cache.add(answer) end |
.cache_recursive(answer) ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 52 def PacketSender.cache_recursive(answer) @@recursive_cache.add(answer) end |
.clear_caches ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 56 def PacketSender.clear_caches @@recursive_cache.clear @@authoritative_cache.clear end |
Instance Method Details
#add_opt_rr(packet) ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 620 def add_opt_rr(packet) Dnsruby.log.debug { ";; Adding EDNS extension with UDP packetsize #{udp_packet_size}.\n" } # RFC 3225 optrr = RR::OPT.new(udp_packet_size) # Only one OPT RR allowed per packet - do we already have one? if (packet.additional.rrset(packet.question()[0].qname, Types::OPT).rrs.length == 0) packet.add_additional(optrr) end end |
#add_src_port(p) ⇒ Object
Can be a single Fixnum or a Range or an Array
If an invalid port is selected (one reserved by
IANA), then an ArgumentError will be raised.
"0" means "any valid port" - this is only a viable
option if it is the only port in the list.
An ArgumentError will be raised if "0" is added to
an existing set of source ports.
res.add_src_port(60000)
res.add_src_port([60001,60005,60010])
res.add_src_port(60015..60115)
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# File 'lib/dnsruby/packet_sender.rb', line 480 def add_src_port(p) if (Resolver.check_port(p, @src_port)) a = Resolver.get_ports_from(p) a.each do |x| if ((@src_port.length > 0) && (x == 0)) raise ArgumentError.new("src_port of 0 only allowed as only src_port value (currently #{@src_port.length} values") end @src_port.push(x) end end end |
#check_ipv6 ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 215 def check_ipv6 begin i = IPv4.create(@server) # @src_address = '0.0.0.0' @ipv6=false rescue Exception begin i = IPv6.create(@server) # @src_address6 = '::' @ipv6=true rescue Exception Dnsruby.log.error { "Server is neither IPv4 or IPv6!\n" } end end end |
#check_response(response, response_bytes, query, client_queue, client_query_id, tcp) ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 514 def check_response(response, response_bytes, query, client_queue, client_query_id, tcp) # @TODO@ Should send_raw avoid this? if (!query.send_raw) sig_value = check_tsig(query, response, response_bytes) if (sig_value != :okay) # Should send error back up to Resolver here, and then NOT QUERY AGAIN!!! return sig_value end # Should check that question section is same as question that was sent! RFC 5452 # If it's not an update... if (query.class == Update) # @TODO@!! else if ((response.question.size == 0) || (response.question[0].qname.labels != query.question[0].qname.labels) || (response.question[0].qtype != query.question[0].qtype) || (response.question[0].qclass != query.question[0].qclass) || (response.question.length != query.question.length) || (response.header.id != query.header.id)) TheLog.info("Incorrect packet returned : #{response.to_s}") return false end end # end # IF WE GET FORMERR BACK HERE (and we have EDNS0 on) THEN # TRY AGAIN WITH NO OPT RECORDS! (rfc2671 section 5.3) if ((response.header.get_header_rcode == RCode.FORMERR) && (query.header.arcount > 0)) # try resending the message with no OPT record query.remove_additional query.send_raw = true send_async(query, client_queue, client_query_id, false) return false end if (response.header.tc && !tcp && !@ignore_truncation) if (@no_tcp) Dnsruby.log.debug { "Truncated response - not resending over TCP as no_tcp==true" } else # Try to resend over tcp Dnsruby.log.debug { "Truncated - resending over TCP" } # @TODO@ Are the query options used correctly here? DNSSEC in particular... # query.send_raw = true # Make sure that the packet is not messed with. send_async(query, client_queue, client_query_id, true) return false end end end return true end |
#check_tsig(query, response, response_bytes) ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 564 def check_tsig(query, response, response_bytes) if (query.tsig) if (response.tsig) if !query.tsig.verify(query, response, response_bytes) # Discard packet and wait for correctly signed response Dnsruby.log.error { "TSIG authentication failed!" } return TsigError.new end else # Treated as having format error and discarded (RFC2845, 4.6) # but return a different error code, because some servers fail at # this Dnsruby.log.error { "Expecting TSIG signed response, but got unsigned response - discarding" } return TsigNotSignedResponseError.new end elsif (response.tsig) # Error - signed response to unsigned query Dnsruby.log.error { "Signed response to unsigned query" } return TsigError.new end return :okay end |
#close ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 231 def close # @TODO@ What about closing? # Any queries to complete? Sockets to close? end |
#get_next_src_port ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 493 def get_next_src_port # Different OSes have different interpretations of "random port" here. # Apparently, Linux will just give you the same port as last time, unless it is still # open, in which case you get n+1. # We need to determine an actual (random) number here, then ask the OS for it, and # continue until we get one. if (@src_port[0] == 0) candidate = -1 # # better to construct an array of all the ports we *can* use, and then just pick one at random! # candidate = Iana::UNRESERVED_PORTS[rand(Iana::UNRESERVED_PORTS.length())] # # while (!(Resolver.port_in_range(candidate))) # # candidate = (rand(65535-1024) + 1024) # # end # @TODO@ Should probably construct a bitmap of the IANA ports... candidate = 50000 + (rand(15535)) # pick one over 50000 return candidate end pos = rand(@src_port.length) return @src_port[pos] end |
#make_query(name, type = Types::A, klass = Classes::IN, set_cd = @dnssec) ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 587 def make_query(name, type = Types::A, klass = Classes::IN, set_cd=@dnssec) msg = Message.new msg.header.rd = 1 msg.add_question(name, type, klass) if (@dnssec) msg.header.cd = set_cd # We do our own validation by default end return msg end |
#make_query_packet(packet, use_tcp = @use_tcp) ⇒ Object
Prepare the packet for sending
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# File 'lib/dnsruby/packet_sender.rb', line 598 def make_query_packet(packet, use_tcp = @use_tcp) #:nodoc: all if (!packet.send_raw) # Don't mess with this packet! if (packet.header.opcode == OpCode.QUERY || @recurse) packet.header.rd=@recurse end # Only do this if the packet has not been prepared already! if (@dnssec) prepare_for_dnssec(packet) elsif ((udp_packet_size > Resolver::DefaultUDPSize) && !use_tcp) # if ((udp_packet_size > Resolver::DefaultUDPSize) && !use_tcp) # @TODO@ What if an existing OPT RR is not big enough? Should we replace it? add_opt_rr(packet) end end if (@tsig && !packet.signed?) @tsig.apply(packet) end return packet.encode end |
#prepare_for_dnssec(packet) ⇒ Object
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# File 'lib/dnsruby/packet_sender.rb', line 631 def prepare_for_dnssec(packet) # RFC 4035 Dnsruby.log.debug { ";; Adding EDNS extension with UDP packetsize #{udp_packet_size} and DNS OK bit set\n" } optrr = RR::OPT.new(udp_packet_size) # Decimal UDPpayload optrr.dnssec_ok=true if (packet.additional.rrset(packet.question()[0].qname, Types::OPT).rrs.length == 0) packet.add_additional(optrr) end packet.header.ad = false # RFC 4035 section 4.6 # SHOULD SET CD HERE!!! if (packet.do_validation) packet.header.cd = true end if (Dnssec.no_keys?) packet.header.cd = false end end |
#send_async(*args) ⇒ Object
Asynchronously send a Message to the server. The send can be done using just Dnsruby. Support for EventMachine has been deprecated.
Dnsruby pure Ruby event loop :
A client_queue is supplied by the client, along with an optional client_query_id to identify the response. The client_query_id is generated, if not supplied, and returned to the client. When the response is known, the tuple (query_id, response_message, response_exception) is put in the queue for the client to process.
The query is sent synchronously in the caller’s thread. The select thread is then used to listen for and process the response (up to pushing it to the client_queue). The client thread is then used to retrieve the response and deal with it.
Takes :
-
msg - the message to send
-
client_queue - a Queue to push the response to, when it arrives
-
client_query_id - an optional ID to identify the query to the client
-
use_tcp - whether to use TCP (defaults to PacketSender.use_tcp)
Returns :
-
client_query_id - to identify the query response to the client. This ID is
generated if it is not passed in by the client
If the native Dsnruby networking layer is being used, then this method returns the client_query_id
id = res.send_async(msg, queue)
NOT SUPPORTED : id = res.send_async(msg, queue, use_tcp)
id = res.send_async(msg, queue, id)
id = res.send_async(msg, queue, id, use_tcp)
Use Message#send_raw to send the packet with an untouched header. Use Message#do_caching to tell dnsruby whether to check the cache before sending, and update the cache upon receiving a response. Use Message#do_validation to tell dnsruby whether or not to do DNSSEC validation for this particular packet (assuming SingleResolver#dnssec == true) Note that these options should not normally be used!
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# File 'lib/dnsruby/packet_sender.rb', line 276 def send_async(*args) # msg, client_queue, client_query_id, use_tcp=@use_tcp) # @TODO@ Need to select a good Header ID here - see forgery-resilience RFC draft for details msg = args[0] client_query_id = nil client_queue = nil use_tcp = @use_tcp if (msg.kind_of? String) msg = Message.new(msg) if (@dnssec) msg.header.cd = @dnssec # we'll do our own validation by default if (Dnssec.no_keys?) msg.header.cd = false end end end if (args.length > 1) if (args[1].class==Queue) client_queue = args[1] elsif (args.length == 2) use_tcp = args[1] end if (args.length > 2) client_query_id = args[2] if (args.length > 3) use_tcp = args[3] end end end # Need to keep track of the request mac (if using tsig) so we can validate the response (RFC2845 4.1) # #Are we using EventMachine or native Dnsruby? # if (Resolver.eventmachine?) # return send_eventmachine(query_packet, msg, client_query_id, client_queue, use_tcp) # else if (!client_query_id) client_query_id = Time.now + rand(10000) # is this safe?! end query_packet = make_query_packet(msg, use_tcp) if (msg.do_caching && (msg.class != Update)) # Check the cache!! cachedanswer = nil if (msg.header.rd) cachedanswer = @@recursive_cache.find(msg.question()[0].qname, msg.question()[0].type) else cachedanswer = @@authoritative_cache.find(msg.question()[0].qname, msg.question()[0].type) end if (cachedanswer) TheLog.debug("Sending cached answer to client\n") # @TODO@ Fix up the header - ID and flags cachedanswer.header.id = msg.header.id # If we can find the answer, send it to the client straight away # Post the result to the client using SelectThread st = SelectThread.instance st.push_response_to_select(client_query_id, client_queue, cachedanswer, msg, self) return client_query_id end end # Otherwise, run the query if (udp_packet_size < query_packet.length) if (@no_tcp) # Can't send the message - abort! err=IOError.new("Can't send message - too big for UDP and no_tcp=true") Dnsruby.log.error { "#{err}" } st.push_exception_to_select(client_query_id, client_queue, err, nil) return end Dnsruby.log.debug { "Query packet length exceeds max UDP packet size - using TCP" } use_tcp = true end send_dnsruby(query_packet, msg, client_query_id, client_queue, use_tcp) return client_query_id # end end |
#send_dnsruby(query_bytes, query, client_query_id, client_queue, use_tcp) ⇒ Object
This method sends the packet using the built-in pure Ruby event loop, with no dependencies.
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# File 'lib/dnsruby/packet_sender.rb', line 353 def send_dnsruby(query_bytes, query, client_query_id, client_queue, use_tcp) #:nodoc: all endtime = Time.now + @packet_timeout # First send the query (synchronously) st = SelectThread.instance socket = nil runnextportloop = true numtries = 0 src_address = @src_address if (@ipv6) src_address = @src_address6 end while (runnextportloop) do begin numtries += 1 src_port = get_next_src_port if (use_tcp) begin socket = TCPSocket.new(@server, @port, src_address, src_port) rescue Errno::EBADF, Errno::ENETUNREACH => e # Can't create a connection err=IOError.new("TCP connection error to #{@server}:#{@port} from #{src_address}:#{src_port}, use_tcp=#{use_tcp}, exception = #{e.class}, #{e}") Dnsruby.log.error { "#{err}" } st.push_exception_to_select(client_query_id, client_queue, err, nil) return end else socket = nil # JRuby UDPSocket only takes 0 parameters - no IPv6 support in JRuby... if (/java/ =~ RUBY_PLATFORM) socket = UDPSocket.new() else # ipv6 = @src_address =~ /:/ socket = UDPSocket.new(@ipv6 ? Socket::AF_INET6 : Socket::AF_INET) end socket.bind(src_address, src_port) socket.connect(@server, @port) end runnextportloop = false rescue Exception => e if (socket!=nil) begin socket.close rescue Exception end end # Try again if the error was EADDRINUSE and a random source port is used # Maybe try a max number of times? if ((e.class != Errno::EADDRINUSE) || (numtries > 50) || ((e.class == Errno::EADDRINUSE) && (src_port == @src_port[0]))) err=IOError.new("dnsruby can't connect to #{@server}:#{@port} from #{src_address}:#{src_port}, use_tcp=#{use_tcp}, exception = #{e.class}, #{e}") Dnsruby.log.error { "#{err}" } st.push_exception_to_select(client_query_id, client_queue, err, nil) return end end end if (socket==nil) err=IOError.new("dnsruby can't connect to #{@server}:#{@port} from #{src_address}:#{src_port}, use_tcp=#{use_tcp}") Dnsruby.log.error { "#{err}" } st.push_exception_to_select(client_query_id, client_queue, err, nil) return end Dnsruby.log.debug { "Sending packet to #{@server}:#{@port} from #{src_address}:#{src_port}, use_tcp=#{use_tcp} : #{query.question()[0].qname}, #{query.question()[0].qtype}" } # print "#{Time.now} : Sending packet to #{@server} : #{query.question()[0].qname}, #{query.question()[0].qtype}\n" # Listen for the response before we send the packet (to avoid any race conditions) query_settings = SelectThread::QuerySettings.new(query_bytes, query, @ignore_truncation, client_queue, client_query_id, socket, @server, @port, endtime, udp_packet_size, self) begin if (use_tcp) lenmsg = [query_bytes.length].pack('n') socket.send(lenmsg, 0) end socket.send(query_bytes, 0) # The select thread will now wait for the response and send that or a timeout # back to the client_queue. st.add_to_select(query_settings) rescue Exception => e err=IOError.new("Send failed to #{@server}:#{@port} from #{src_address}:#{src_port}, use_tcp=#{use_tcp}, exception : #{e}") Dnsruby.log.error { "#{err}" } st.push_exception_to_select(client_query_id, client_queue, err, nil) begin socket.close rescue Exception end return end Dnsruby.log.debug { "Packet sent to #{@server}:#{@port} from #{src_address}:#{src_port}, use_tcp=#{use_tcp} : #{query.question()[0].qname}, #{query.question()[0].qtype}" } # print "Packet sent to #{@server}:#{@port} from #{@src_address}:#{src_port}, use_tcp=#{use_tcp} : #{query.question()[0].qname}, #{query.question()[0].qtype}\n" end |
#src_address6=(arg) ⇒ Object
Set the source address. If the arg is nil, do nothing
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# File 'lib/dnsruby/packet_sender.rb', line 109 def src_address6=(arg) if (not arg.nil?) @src_address6 = arg end end |
#src_port ⇒ Object
The source port to send queries from
Returns either a single Fixnum or an Array
e.g. "0", or "[60001, 60002, 60007]"
Defaults to 0 - random port
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# File 'lib/dnsruby/packet_sender.rb', line 448 def src_port if (@src_port.length == 1) return @src_port[0] end return @src_port end |
#src_port=(p) ⇒ Object
Can be a single Fixnum or a Range or an Array
If an invalid port is selected (one reserved by
IANA), then an ArgumentError will be raised.
res.src_port=0
res.src_port=[60001,60005,60010]
res.src_port=60015..60115
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# File 'lib/dnsruby/packet_sender.rb', line 463 def src_port=(p) @src_port=[] add_src_port(p) end |
#udp_packet_size ⇒ Object
Return the packet size to use for UDP
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# File 'lib/dnsruby/packet_sender.rb', line 654 def udp_packet_size # if @udp_size > DefaultUDPSize then we use EDNS and # @udp_size should be taken as the maximum packet_data length ret = (@udp_size > Resolver::DefaultUDPSize ? @udp_size : Resolver::DefaultUDPSize) return ret end |