Initial translation of proxy and network-query to os2
This commit is contained in:
Tony Garnock-Jones
parent
f466fd6a05
commit
f79bf86111
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@ -5,10 +5,10 @@
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(require "api.rkt")
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(require "codec.rkt")
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(require "zonedb.rkt")
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(require "../racket-matrix/os-big-bang.rkt")
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(require "../racket-matrix/os-udp.rkt")
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(require "../racket-matrix/os-timer.rkt")
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(require "os-dns.rkt")
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(require "../racket-matrix/os2.rkt")
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(require "../racket-matrix/os2-udp.rkt")
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(require "../racket-matrix/os2-timer.rkt")
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(require "os2-dns.rkt")
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(provide network-query
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(struct-out network-reply))
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@ -214,13 +214,13 @@
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;; network-query : UdpAddress Question DomainName NEListOf<DomainName> UniqueId -> BootK
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(define (network-query s q zone-origin server-names unique-id)
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(os-big-bang/transition
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(try-next-server (network-query-state (network-request s q zone-origin server-names unique-id)
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first-timeout
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(hash)
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'()
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#f
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server-names))))
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(lambda (self-pid)
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(try-next-server (network-query-state (network-request s q zone-origin server-names unique-id)
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first-timeout
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(hash)
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'()
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#f
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server-names))))
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(define (try-next-server w)
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(match w
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@ -248,31 +248,31 @@
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[current-name current-name]
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[remaining-names remaining-names])
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(send-message subq)
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(subscribe/fresh subscription-id
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(message-handlers w
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[(answered-question (== subq) ans)
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(define ips
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(map make-dns-address (set->list (extract-addresses current-name ans))))
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(extend-transition
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(try-next-server (struct-copy network-query-state w
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[known-addresses (hash-set known-addresses
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current-name
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ips)]
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[remaining-addresses ips]))
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(unsubscribe subscription-id))])))))]
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(role/fresh subq-id (topic-subscriber (answered-question subq (wild)))
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#:state w
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[(answered-question (== subq) ans)
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(define ips
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(map make-dns-address (set->list (extract-addresses current-name ans))))
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(extend-transition
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(try-next-server (struct-copy network-query-state w
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[known-addresses (hash-set known-addresses
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current-name
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ips)]
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[remaining-addresses ips]))
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(delete-role subq-id))]))))]
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[(network-query-state req timeout _ (cons current-ip remaining-ips) _ _)
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(define rpc-id (gensym 'network-query/allocate-query-id))
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(transition w
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(send-message `(request ,rpc-id allocate-query-id))
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(subscribe rpc-id
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(message-handlers w
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[`(reply ,(== rpc-id) ,id)
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(extend-transition (send-request (struct-copy network-query-state w
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[remaining-addresses remaining-ips])
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id
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timeout
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current-ip)
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(unsubscribe rpc-id))])))]))
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(role rpc-id (topic-subscriber `(reply ,rpc-id ,(wild)))
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#:state w
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[`(reply ,(== rpc-id) ,id)
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(extend-transition (send-request (struct-copy network-query-state w
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[remaining-addresses remaining-ips])
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id
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timeout
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current-ip)
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(delete-role rpc-id))]))]))
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(define (on-answer w ans server-ip)
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(match ans
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@ -309,30 +309,32 @@
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(transition w
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(send-message (dns-request query s server-ip))
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(send-message (set-timer subscription-id (* timeout 1000) 'relative))
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(subscribe subscription-id
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(message-handlers w
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[(timer-expired (== subscription-id) _)
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(log-debug (format "Timed out ~v ~v to ~v ~v after ~v seconds"
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q query-id
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zone-origin server-ip
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timeout))
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(extend-transition (try-next-server w)
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(unsubscribe subscription-id)
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(send-message (list 'release-query-id query-id)))]
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[(dns-reply reply-message source (== s))
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;; TODO: maybe receive only specifically from the queried IP address?
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(log-debug
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(format
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"Answer to ~v from ~v ~v in ~v ms~n-- Answers: ~v~n-- Authorities: ~v~n-- Additional: ~v"
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q zone-origin server-ip
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(inexact->exact (round (- (current-inexact-milliseconds) start-time)))
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(dns-message-answers reply-message)
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(dns-message-authorities reply-message)
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(dns-message-additional reply-message)))
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(if (not (= (dns-message-id reply-message) (dns-message-id query)))
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w
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(extend-transition (on-answer w
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(filter-dns-reply q reply-message zone-origin)
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server-ip)
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(unsubscribe subscription-id)
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(send-message (list 'release-query-id query-id))))]))))
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(role subscription-id
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(set (topic-subscriber (timer-expired subscription-id (wild)))
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(topic-subscriber (dns-reply (wild) (wild) s)))
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#:state w
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[(timer-expired (== subscription-id) _)
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(log-debug (format "Timed out ~v ~v to ~v ~v after ~v seconds"
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q query-id
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zone-origin server-ip
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timeout))
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(extend-transition (try-next-server w)
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(delete-role subscription-id)
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(send-message (list 'release-query-id query-id)))]
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[(dns-reply reply-message source (== s))
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;; TODO: maybe receive only specifically from the queried IP address?
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(log-debug
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(format
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"Answer to ~v from ~v ~v in ~v ms~n-- Answers: ~v~n-- Authorities: ~v~n-- Additional: ~v"
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q zone-origin server-ip
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(inexact->exact (round (- (current-inexact-milliseconds) start-time)))
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(dns-message-answers reply-message)
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(dns-message-authorities reply-message)
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(dns-message-additional reply-message)))
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(if (not (= (dns-message-id reply-message) (dns-message-id query)))
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w
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(extend-transition (on-answer w
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(filter-dns-reply q reply-message zone-origin)
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server-ip)
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(delete-role subscription-id)
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(send-message (list 'release-query-id query-id))))])))
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360
proxy.rkt
360
proxy.rkt
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@ -11,11 +11,10 @@
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(require "zonedb.rkt")
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(require "network-query.rkt")
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(require "resolver.rkt")
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(require "../racket-matrix/os.rkt")
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(require "../racket-matrix/os-big-bang.rkt")
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(require "../racket-matrix/os-udp.rkt")
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(require "../racket-matrix/os-timer.rkt")
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(require "os-dns.rkt")
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(require "../racket-matrix/os2.rkt")
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(require "../racket-matrix/os2-udp.rkt")
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(require "../racket-matrix/os2-timer.rkt")
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(require "os2-dns.rkt")
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(require racket/pretty)
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@ -27,77 +26,72 @@
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;; start-proxy : UInt16 CompiledZone CompiledZone -> Void
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(define (start-proxy port-number zone roots-only)
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(define server-addr (udp-listener port-number))
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(define client-addr (udp-handle 'dns-client))
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(define boot-server
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(os-big-bang 'no-state/boot-server
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(spawn dns-spy)
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(spawn (timer-relay 'timer-relay:dns))
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(spawn (query-id-allocator))
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(send-meta-message `(request create-server-socket (udp new ,port-number 512)))
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(subscribe/fresh wait-id
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(meta-message-handlers w
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[`(reply create-server-socket ,s)
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(transition w
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(unsubscribe wait-id)
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(send-meta-message
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`(request create-client-socket (udp new 0 512)))
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(client-socket-waiter s))]))))
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(log-info "Ready.")
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(define (client-socket-waiter s)
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(subscribe/fresh wait-id
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(meta-message-handlers w
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[`(reply create-client-socket ,c)
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(log-info "Ready.")
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(transition w
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(unsubscribe wait-id)
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(spawn (dns-read-driver s))
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(spawn (dns-write-driver s))
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(spawn (dns-read-driver c))
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(spawn (dns-write-driver c))
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(spawn (packet-dispatcher s))
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(spawn (question-dispatcher zone roots-only c)))])))
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(ground-vm (os-big-bang (void)
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;;(spawn udp-spy)
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(spawn udp-driver)
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(spawn (timer-driver 'timer-driver))
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(spawn (nested-vm boot-server)))))
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(ground-vm
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(transition 'no-state
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;;(spawn udp-spy)
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(spawn udp-driver #:debug-name 'udp-driver)
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(spawn (timer-driver 'timer-driver) #:debug-name 'timer-driver)
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(spawn (nested-vm
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'dns-vm
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(transition 'no-state
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(spawn dns-spy #:debug-name 'dns-spy)
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(spawn (timer-relay 'timer-relay:dns) #:debug-name 'timer-relay)
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(spawn (query-id-allocator) #:debug-name 'query-id-allocator)
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(spawn (dns-read-driver server-addr) #:debug-name 'server-dns-reader)
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(spawn (dns-write-driver server-addr) #:debug-name 'server-dns-writer)
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(spawn (dns-read-driver client-addr) #:debug-name 'client-dns-reader)
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(spawn (dns-write-driver client-addr) #:debug-name 'client-dns-writer)
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(spawn (packet-dispatcher server-addr) #:debug-name 'packet-dispatcher)
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(spawn (question-dispatcher zone roots-only client-addr)
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#:debug-name 'question-dispatcher)))
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#:debug-name 'dns-vm))))
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(define (query-id-allocator)
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;; TODO: track how many are allocated and throttle requests if too
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;; many are in flight
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(os-big-bang (set) ;; SetOf<UInt16>, all active query IDs
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(subscribe 'query-id-request-handler
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(message-handlers allocated
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[`(request ,reply-addr allocate-query-id)
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(let recheck ()
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(define n (random 65536))
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(if (set-member? allocated n)
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(recheck)
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(transition (set-add allocated n)
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(send-message `(reply ,reply-addr ,n)))))]
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[`(release-query-id ,n)
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(transition (set-remove allocated n))]))))
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(transition (set) ;; SetOf<UInt16>, all active query IDs
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(role 'query-id-request-handler (topic-subscriber `(request ,(wild) allocate-query-id))
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#:state allocated
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[`(request ,reply-addr allocate-query-id)
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(let recheck ()
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(define n (random 65536))
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(if (set-member? allocated n)
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(recheck)
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(transition (set-add allocated n)
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(send-message `(reply ,reply-addr ,n)))))])
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(role 'query-id-release-handler (topic-subscriber `(release-query-id ,(wild)))
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#:state allocated
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[`(release-query-id ,n)
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(transition (set-remove allocated n))])))
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(define (packet-dispatcher s)
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(os-big-bang (set) ;; SetOf<ActiveRequest>
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(subscribe 'packet-dispatcher
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(message-handlers old-active-requests
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[(? bad-dns-packet? p)
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(log-error (pretty-format p))
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;; TODO: ^ perhaps use metalevel events? perhaps don't bother though
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old-active-requests]
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[(and r (dns-request m source (== s))) ;; We only listen for requests on our server socket
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(define req-id (active-request source (dns-message-id m)))
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;; TODO: when we have presence/error-handling, remove req-id
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;; from active requests once request-handler pseudothread exits.
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(if (set-member? old-active-requests req-id)
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old-active-requests ;; ignore retransmitted duplicates
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(transition (set-add old-active-requests req-id)
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(spawn (packet-relay req-id r))))]
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[(and r (dns-reply m (== s) sink))
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(define req-id (active-request sink (dns-message-id m)))
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(set-remove old-active-requests req-id)]))))
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(transition (set) ;; SetOf<ActiveRequest>
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(role 'error-logger (topic-subscriber (bad-dns-packet (wild) (wild) (wild) (wild)))
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#:state old-active-requests
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[p
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(log-error (pretty-format p))
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;; TODO: ^ perhaps use metalevel events? perhaps don't bother though
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old-active-requests])
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(role 'request-booter (topic-subscriber (dns-request (wild) (wild) s))
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#:state old-active-requests
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[(and r (dns-request m source (== s))) ;; We only listen for requests on our server socket
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(define req-id (active-request source (dns-message-id m)))
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;; TODO: when we have presence/error-handling, remove req-id
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;; from active requests once request-handler pseudothread exits.
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(if (set-member? old-active-requests req-id)
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old-active-requests ;; ignore retransmitted duplicates
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(transition (set-add old-active-requests req-id)
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(spawn (packet-relay req-id r) #:debug-name (list 'packet-relay req-id))))])
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(role 'reply-cleanup (topic-subscriber (dns-reply (wild) s (wild)))
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#:state old-active-requests
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[(and r (dns-reply m (== s) sink))
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(define req-id (active-request sink (dns-message-id m)))
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(set-remove old-active-requests req-id)])))
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(define (packet-relay req-id request)
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(match-define (dns-request request-message request-source request-sink) request)
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@ -126,39 +120,40 @@
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(match (dns-message-questions request-message)
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['()
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;; No questions!
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(os-big-bang 'no-state/packet-relay
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(transition 'no-state/packet-relay
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(send-message (answer->reply #f (empty-complete-answer))))]
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[(cons original-question _)
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;; At least one question
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(log-debug (format "Looking up ~v with query id ~v"
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original-question (dns-message-id request-message)))
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(os-big-bang 'no-state/packet-relay
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(transition 'no-state/packet-relay
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(send-message original-question)
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(subscribe/fresh wait-id
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(message-handlers w
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[(answered-question (== original-question) answer)
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(log-debug (format "Final answer to ~v with query id ~v is ~v"
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original-question
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(dns-message-id request-message)
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answer))
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(transition w
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(unsubscribe wait-id)
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(send-message (answer->reply original-question answer)))])))]))
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(role/fresh wait-id (topic-subscriber (answered-question original-question (wild)))
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#:state w
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[(answered-question (== original-question) answer)
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(log-debug (format "Final answer to ~v with query id ~v is ~v"
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original-question
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(dns-message-id request-message)
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answer))
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(transition w
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(delete-role wait-id)
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(send-message (answer->reply original-question answer)))]))]))
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(define (glueless-question-handler roots-only-zone q client-sock)
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;; Restart q, an overly-glueless question, from the roots.
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(define restarted-question (restart-question q))
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(os-big-bang 'no-state
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(subscribe/fresh relay
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(message-handlers w
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[(answered-question (== restarted-question) ans)
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;; We got the answer to our restarted question; now transform
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;; it into an answer to the original question, to unblock the
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;; original questioner.
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(transition w
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(unsubscribe relay)
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(send-message (answered-question q ans)))]))
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(spawn (question-handler roots-only-zone restarted-question client-sock))))
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(transition 'no-state
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(role/fresh relay (topic-subscriber (answered-question restarted-question (wild)))
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#:state w
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[(answered-question (== restarted-question) ans)
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;; We got the answer to our restarted question; now transform
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;; it into an answer to the original question, to unblock the
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;; original questioner.
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(transition w
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(delete-role relay)
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(send-message (answered-question q ans)))])
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(spawn (question-handler roots-only-zone restarted-question client-sock)
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#:debug-name (list 'glueless-question-handler-inner restarted-question))))
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(define (question-dispatcher seed-zone roots-only client-sock)
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(define (transition-and-set-timers new-zone timers)
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@ -167,60 +162,67 @@
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(match-define (cons name ttl) timerspec)
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(send-message (set-timer (list 'check-dns-expiry name) (* ttl 1000) 'relative)))))
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(define-values (cleaned-seed-zone initial-timers) (zone-expire seed-zone))
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(os-big-bang/transition
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(extend-transition (transition-and-set-timers cleaned-seed-zone initial-timers)
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;; TODO: consider deduping questions here too?
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(subscribe 'question-handler-factory
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(message-handlers zone
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[`(debug-dump)
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(with-output-to-file "zone-proxy.zone"
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(lambda ()
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(write-bytes (bit-string->bytes (zone->bit-string zone))))
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#:mode 'binary
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#:exists 'replace)
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(with-output-to-file "zone-proxy.dump"
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(lambda ()
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(display "----------------------------------------------------------------------\n")
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(display (seconds->date (current-seconds)))
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(newline)
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(for* ([(name rrmap) zone] [(rr expiry) rrmap])
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(write (list rr expiry))
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(newline))
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(newline))
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#:mode 'text
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#:exists 'append)
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(with-output-to-file "zone-proxy.debug"
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(lambda ()
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(display "----------------------------------------------------------------------\n")
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(display (seconds->date (current-seconds)))
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(newline)
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(pretty-write current-ground-transition))
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#:mode 'text
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#:exists 'append)
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zone]
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[(? question? q)
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(transition zone
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(cond
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[(question-cyclic? q)
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(log-warning (format "Cyclic question ~v" q))
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(send-message (answered-question q (empty-complete-answer)))]
|
||||
[(question-too-glueless? q)
|
||||
(log-warning (format "Overly-glueless question ~v" q))
|
||||
(spawn (glueless-question-handler roots-only q client-sock))]
|
||||
[else
|
||||
(spawn (question-handler zone q client-sock))]))]
|
||||
[(network-reply _ answer)
|
||||
(define-values (new-zone timers) (incorporate-complete-answer answer zone))
|
||||
(transition-and-set-timers new-zone timers)]
|
||||
[(timer-expired (list 'check-dns-expiry name) now-msec)
|
||||
(zone-expire-name zone name (/ now-msec 1000.0))])))))
|
||||
(extend-transition (transition-and-set-timers cleaned-seed-zone initial-timers)
|
||||
;; TODO: consider deduping questions here too?
|
||||
(role 'debug-dumper (topic-subscriber `(debug-dump))
|
||||
#:state zone
|
||||
[`(debug-dump)
|
||||
(with-output-to-file "zone-proxy.zone"
|
||||
(lambda ()
|
||||
(write-bytes (bit-string->bytes (zone->bit-string zone))))
|
||||
#:mode 'binary
|
||||
#:exists 'replace)
|
||||
(with-output-to-file "zone-proxy.dump"
|
||||
(lambda ()
|
||||
(display "----------------------------------------------------------------------\n")
|
||||
(display (seconds->date (current-seconds)))
|
||||
(newline)
|
||||
(for* ([(name rrmap) zone] [(rr expiry) rrmap])
|
||||
(write (list rr expiry))
|
||||
(newline))
|
||||
(newline))
|
||||
#:mode 'text
|
||||
#:exists 'append)
|
||||
(with-output-to-file "zone-proxy.debug"
|
||||
(lambda ()
|
||||
(display "----------------------------------------------------------------------\n")
|
||||
(display (seconds->date (current-seconds)))
|
||||
(newline)
|
||||
(pretty-write current-ground-transition))
|
||||
#:mode 'text
|
||||
#:exists 'append)
|
||||
zone])
|
||||
(role 'question-handler-factory (topic-subscriber (question (wild) (wild) (wild) (wild)))
|
||||
#:state zone
|
||||
[(? question? q)
|
||||
(transition zone
|
||||
(cond
|
||||
[(question-cyclic? q)
|
||||
(log-warning (format "Cyclic question ~v" q))
|
||||
(send-message (answered-question q (empty-complete-answer)))]
|
||||
[(question-too-glueless? q)
|
||||
(log-warning (format "Overly-glueless question ~v" q))
|
||||
(spawn (glueless-question-handler roots-only q client-sock)
|
||||
#:debug-name (list 'glueless-question-handler-outer q))]
|
||||
[else
|
||||
(spawn (question-handler zone q client-sock)
|
||||
#:debug-name (list 'question-handler q))]))])
|
||||
(role 'network-reply-snoop (topic-subscriber (network-reply (wild) (wild)))
|
||||
#:state zone
|
||||
[(network-reply _ answer)
|
||||
(define-values (new-zone timers) (incorporate-complete-answer answer zone))
|
||||
(transition-and-set-timers new-zone timers)])
|
||||
(role 'timer-expiry-handler
|
||||
(topic-subscriber (timer-expired (list 'check-dns-expiry (wild)) (wild)))
|
||||
#:state zone
|
||||
[(timer-expired (list 'check-dns-expiry name) now-msec)
|
||||
(zone-expire-name zone name (/ now-msec 1000.0))])))
|
||||
|
||||
(struct question-state (zone q client-sock nameservers-tried retry-count) #:prefab)
|
||||
(struct expanding-cnames (q accumulator remaining-count) #:prefab)
|
||||
|
||||
(define (question-handler zone q client-sock)
|
||||
(os-big-bang/transition
|
||||
(retry-question (question-state zone q client-sock (set) 0))))
|
||||
(retry-question (question-state zone q client-sock (set) 0)))
|
||||
|
||||
(define (send-empty-reply w q)
|
||||
(transition w (send-message (answered-question q (empty-complete-answer)))))
|
||||
|
|
@ -248,33 +250,34 @@
|
|||
q
|
||||
zone-origin
|
||||
(map rr-rdata (set->list nameserver-rrs))
|
||||
referral-id))
|
||||
(subscribe referral-id
|
||||
(message-handlers w
|
||||
[(network-reply (== referral-id) #f) ;; name-error/NXDOMAIN
|
||||
(transition w
|
||||
(unsubscribe referral-id)
|
||||
(send-message (answered-question q #f)))]
|
||||
[(network-reply (== referral-id) ans)
|
||||
(define-values (new-zone ignored-timers) (incorporate-complete-answer ans zone))
|
||||
(when (log-level? (current-logger) 'debug)
|
||||
(log-debug (format "Referral ~v results in origin ~v:~n"
|
||||
referral-id zone-origin))
|
||||
(for ([k (set-union (list->set (hash-keys zone))
|
||||
(list->set (hash-keys new-zone)))]
|
||||
#:when (in-bailiwick? k zone-origin))
|
||||
(log-debug (format "Old ~v ~v~nNew ~v ~v"
|
||||
k (hash-ref zone k 'missing)
|
||||
k (hash-ref new-zone k 'missing))))
|
||||
(log-debug "=-=-=-=-=-="))
|
||||
(define nameserver-names (for/set ([rr nameserver-rrs]) (rr-rdata rr)))
|
||||
(extend-transition
|
||||
(retry-question (struct-copy question-state w
|
||||
[nameservers-tried (set-union nameservers-tried
|
||||
nameserver-names)]
|
||||
[zone new-zone]
|
||||
[retry-count (+ old-retry-count 1)]))
|
||||
(unsubscribe referral-id))])))]
|
||||
referral-id)
|
||||
#:debug-name (list 'network-query q))
|
||||
(role referral-id (topic-subscriber (network-reply referral-id (wild)))
|
||||
#:state w
|
||||
[(network-reply (== referral-id) #f) ;; name-error/NXDOMAIN
|
||||
(transition w
|
||||
(delete-role referral-id)
|
||||
(send-message (answered-question q #f)))]
|
||||
[(network-reply (== referral-id) ans)
|
||||
(define-values (new-zone ignored-timers) (incorporate-complete-answer ans zone))
|
||||
(when (log-level? (current-logger) 'debug)
|
||||
(log-debug (format "Referral ~v results in origin ~v:~n"
|
||||
referral-id zone-origin))
|
||||
(for ([k (set-union (list->set (hash-keys zone))
|
||||
(list->set (hash-keys new-zone)))]
|
||||
#:when (in-bailiwick? k zone-origin))
|
||||
(log-debug (format "Old ~v ~v~nNew ~v ~v"
|
||||
k (hash-ref zone k 'missing)
|
||||
k (hash-ref new-zone k 'missing))))
|
||||
(log-debug "=-=-=-=-=-="))
|
||||
(define nameserver-names (for/set ([rr nameserver-rrs]) (rr-rdata rr)))
|
||||
(extend-transition
|
||||
(retry-question (struct-copy question-state w
|
||||
[nameservers-tried (set-union nameservers-tried
|
||||
nameserver-names)]
|
||||
[zone new-zone]
|
||||
[retry-count (+ old-retry-count 1)]))
|
||||
(delete-role referral-id))]))]
|
||||
[(? complete-answer? ans)
|
||||
(transition w (send-message (answered-question q ans)))]
|
||||
[(partial-answer base cnames)
|
||||
|
|
@ -283,17 +286,18 @@
|
|||
;; TODO: record chains of CNAMEs to avoid pathologically-long chains
|
||||
(define cname-q (cname-question cname q))
|
||||
(list (send-message cname-q)
|
||||
(subscribe/fresh subscription-id
|
||||
(message-handlers (expanding-cnames q acc remaining)
|
||||
[(answered-question (== cname-q) ans)
|
||||
(define new-acc (if ans (merge-answers acc ans) acc))
|
||||
(define new-remaining (- remaining 1))
|
||||
(define new-w (expanding-cnames q new-acc new-remaining))
|
||||
(transition new-w
|
||||
(unsubscribe subscription-id)
|
||||
(if (zero? new-remaining)
|
||||
(send-message (answered-question q new-acc))
|
||||
'()))]))))
|
||||
(role/fresh subscription-id
|
||||
(topic-subscriber (answered-question cname-q (wild)))
|
||||
#:state (expanding-cnames q acc remaining)
|
||||
[(answered-question (== cname-q) ans)
|
||||
(define new-acc (if ans (merge-answers acc ans) acc))
|
||||
(define new-remaining (- remaining 1))
|
||||
(define new-w (expanding-cnames q new-acc new-remaining))
|
||||
(transition new-w
|
||||
(delete-role subscription-id)
|
||||
(if (zero? new-remaining)
|
||||
(send-message (answered-question q new-acc))
|
||||
'()))])))
|
||||
cnames))])]))
|
||||
|
||||
(require "test-rrs.rkt")
|
||||
|
|
|
|||
Loading…
Reference in New Issue