rubydns unexpected quit on windows

[plong009]

the issue happned on both windows7 and win10,
to reproduce the issue: 1. start rubydns 2.run nslookup in the same computer, then the issue happened.
I checked the log and found that endpoint can't bind to socket again if socket error happened.
I checked the code and I don't know how to fix it.

I use ruby2.6-64,
here is my server code:
#!/usr/bin/env ruby
require 'rubydns'

INTERFACES = [
[:udp, "192.168.95.47", 53],
]

IN = Resolv::DNS::Resource::IN

UPSTREAM = RubyDNS::Resolver.new([[:tcp, "8.8.8.8", 53]])

RubyDNS::run_server(INTERFACES) do
match(%r{test.local}, IN::A) do |transaction|
transaction.respond!("10.0.0.80")
end

otherwise do |transaction|
	transaction.passthrough!(UPSTREAM)
end

end

here is the log(on win10-x64):

E:>ruby -d basic-dns.rb
Exception LoadError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/rubygems.rb:1397 - cannot load such file -- rubygems/defaults/ruby Exception LoadError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59 - cannot load such file -- rubydns
C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/rubydns-2.0.2/lib/rubydns.rb:31: warning: parentheses after method name is interpreted as an argument list, not a decomposed argument
C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-io-1.17.2/lib/async/io/socket.rb:124: warning: shadowing outer local variable - task
C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-io-1.17.2/lib/async/io/socket.rb:216: warning: shadowing outer local variable - task
Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - <compiled>: syntax error, unexpected end-of-input ().autoclose= ^ Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - : syntax error, unexpected end-of-input
().sync=
^
Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - <compiled>: syntax error, unexpected end-of-input ().pos= ^ Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - : syntax error, unexpected end-of-input
().close_on_exec=
^
Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - <compiled>: syntax error, unexpected end-of-input ().do_not_reverse_lookup= ^ Exception NameError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/fiddle/import.rb:157 - uninitialized constant Fiddle::Function::STDCALL
C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-dns-1.2.0/lib/async/dns/extensions/resolv.rb:29: warning: parentheses after method name is interpreted as an argument list, not a decomposed argument
C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-dns-1.2.0/lib/async/dns/extensions/resolv.rb:53: warning: method redefined; discarding old to_s
C:/plong/Ruby25-x64/lib/ruby/2.5.0/resolv.rb:1304: warning: previous definition of to_s was here
C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-dns-1.2.0/lib/async/dns/extensions/resolv.rb:57: warning: method redefined; discarding old inspect
C:/plong/Ruby25-x64/lib/ruby/2.5.0/resolv.rb:1236: warning: previous definition of inspect was here
Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - <compiled>: syntax error, unexpected end-of-input ().hostname= ^ Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - : syntax error, unexpected end-of-input
().session=
^
Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - <compiled>: syntax error, unexpected end-of-input ().sync_close= ^ Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - : syntax error, unexpected end-of-input
().close_on_exec=
^
Exception SyntaxError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/forwardable/impl.rb:6 - <compiled>: syntax error, unexpected end-of-input ().reactor= ^ C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-dns-1.2.0/lib/async/dns/resolver.rb:217: warning: assigned but unused variable - peer C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-dns-1.2.0/lib/async/dns/handler.rb:124: warning: assigned but unused variable - error C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-dns-1.2.0/lib/async/dns/transport.rb:80: warning: assigned but unused variable - count 0.2s: Starting Async::DNS server (v1.2.0)... 0.2s: Async::IO::Socket : Binding to #<Addrinfo: 192.168.95.47:53 UDP> 0.21s: <> Listening for datagrams on #<Addrinfo: 192.168.95.47:53 UDP> 4.82s: <> Receiving incoming query (44 bytes) to Async::DNS::DatagramHandler... : <1> Processing question 47.95.168.192.in-addr.arpa Resolv::DNS::Resource::IN::PTR... : <1> Searching for 47.95.168.192.in-addr.arpa Resolv::DNS::Resource::IN::PTR : <1> Checking rule [/test.local/, Resolv::DNS::Resource::IN::A]... 4.82s: <1> Resource class Resolv::DNS::Resource::IN::PTR failed to match Resolv::DNS::Resource::IN::A! 4.82s: [60973] Sending request [[#<Resolv::DNS::Name: 47.95.168.192.in-addr.arpa.>, Resolv::DNS::Resource::IN::PTR]] to address #<Async::IO::HostEndpoint:0x00000000057369f0 @options={}, @specification=["8.8.8.8", 53, nil, 1]> 4.82s: [60973] -> Try address #<Async::IO::HostEndpoint name="8.8.8.8" service=53 family=nil type=1 protocol=nil flags=nil> 4.82s: Async::IO::Socket : Connecting to #<Addrinfo: 8.8.8.8:53 TCP> 6.82s: <> Receiving incoming query (28 bytes) to Async::DNS::DatagramHandler... : <2> Processing question google.com Resolv::DNS::Resource::IN::A... : <2> Searching for google.com Resolv::DNS::Resource::IN::A : <2> Checking rule [/test.local/, Resolv::DNS::Resource::IN::A]... 6.83s: <2> No pattern matched. 6.83s: [3933] Sending request [[#<Resolv::DNS::Name: google.com.>, Resolv::DNS::Resource::IN::A]] to address #<Async::IO::HostEndpoint:0x000000000573ef38 @options={}, @specification=["8.8.8.8", 53, nil, 1]> 6.83s: [3933] -> Try address #<Async::IO::HostEndpoint name="8.8.8.8" service=53 family=nil type=1 protocol=nil flags=nil> 6.83s: Async::IO::Socket : Connecting to #<Addrinfo: 8.8.8.8:53 TCP> 7.17s: [60973] <- Try address #<Async::IO::HostEndpoint name="8.8.8.8" service=53 family=nil type=1 protocol=nil flags=nil> = #<Resolv::DNS::Message:0x000000000573d0c0> 7.17s: [60973] Received valid response with 0 answer(s). : <1> Time to process request: 2.353993s 7.17s: <1> Writing 44 bytes response to client via UDP... Exception Errno::ECONNRESET' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/socket.rb:444 - An existing connection was forcibly closed by the remote host. - recvmsg(2)
7.17s: <Async::Task:0x2b62acc binding to #<Addrinfo: 192.168.95.47:53 UDP> failed>
| Errno::ECONNRESET: An existing connection was forcibly closed by the remote host. - recvmsg(2)
| → C:/plong/Ruby25-x64/lib/ruby/2.5.0/socket.rb 444
| C:/plong/Ruby25-x64/lib/ruby/2.5.0/socket.rb 444
| C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-io-1.17.2/lib/async/io/generic.rb 128
| C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-io-1.17.2/lib/async/io/generic.rb 47
| C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-dns-1.2.0/lib/async/dns/handler.rb 72
| C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-dns-1.2.0/lib/async/dns/server.rb 116
| C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-io-1.17.2/lib/async/io/socket.rb 220
| C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-1.13.0/lib/async/task.rb 198
Exception Async::TimeoutError' at C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-1.13.0/lib/async/task.rb:51 - execution expired Exception Async::TimeoutError' at C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-io-1.17.2/lib/async/io/socket.rb:180 - execution expired
Exception Async::TimeoutError' at C:/plong/Ruby25-x64/lib/ruby/gems/2.5.0/gems/async-io-1.17.2/lib/async/io/host_endpoint.rb:57 - execution expired 11.84s: [3933] Request timed out! : <2> Time to process request: 5.01667s 11.85s: <2> Writing 28 bytes response to client via UDP... Exception IOError' at C:/plong/Ruby25-x64/lib/ruby/2.5.0/socket.rb:321 - closed stream
11.85s: <> UDP response failed: #<IOError: closed stream>!
11.86s: <Async::Reactor:0x2b63260 stopped=false>
: Exiting run-loop because finished.

E:>
log.txt

[plong009]

the root cause is that rubydns got an udp port unreachable icmp packet.
if get an unreachable packet, rubydns can't receive udp requests anymore, it throws an exception and quit.

[ioquatix]

Interesting. It could be nice to start trying to get this stuff working on Windows. Unfortunately, I don't have any reason to spend time on it.

[ioquatix]

Do you know how we should handle Errno::ECONNRESET in the above backtrace? Ignore it? Or is it something wrong with host configuration/firewall?