Actual somewhat-working TCP server -- the chat example from minimart
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main.rkt
65
main.rkt
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@ -1,12 +1,13 @@
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#lang minimart
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(require minimart/demand-matcher)
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(require minimart/drivers/timer)
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(require "ethernet.rkt")
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(require "arp.rkt")
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(require "ip.rkt")
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(require "tcp.rkt")
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(define interface "wlan0")
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(define interface "vboxnet0")
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;;(log-events-and-actions? #t)
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@ -16,8 +17,66 @@
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(spawn-ip-driver interface (bytes 192 168 56 222))
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(spawn-tcp-driver)
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(let ()
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(local-require racket/set racket/string)
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(define (spawn-session them us)
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(define user (gensym 'user))
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(define remote-detector (compile-gestalt-projection (?!)))
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(define peer-detector (compile-gestalt-projection `(,(?!) says ,?)))
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(define (send-to-remote fmt . vs)
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(send #:meta-level 1 (tcp-channel us them (string->bytes/utf-8 (apply format fmt vs)))))
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(define (say who fmt . vs)
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(unless (equal? who user) (send-to-remote "~a ~a\n" who (apply format fmt vs))))
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(list (send-to-remote "Welcome, ~a.\n" user)
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(spawn (lambda (e old-peers)
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(log-info "~a: ~v --> ~v" user e old-peers)
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(match e
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[(message (tcp-channel _ _ bs) 1 #f)
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(transition old-peers
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(send `(,user says ,(string-trim (bytes->string/utf-8 bs)))))]
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[(message `(,who says ,what) 0 #f)
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(transition old-peers (say who "says: ~a" what))]
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[(routing-update g)
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(define new-peers
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(matcher-key-set/single (gestalt-project g 0 0 #t peer-detector)))
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(transition
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new-peers
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(list (when (matcher-empty? (gestalt-project g 1 0 #t remote-detector))
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(quit))
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(for/list [(who (set-subtract new-peers old-peers))]
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(say who "arrived."))
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(for/list [(who (set-subtract old-peers new-peers))]
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(say who "departed."))))]
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[#f #f]))
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(set)
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(gestalt-union (sub `(,? says ,?))
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(sub `(,? says ,?) #:level 1)
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(pub `(,user says ,?))
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(sub (tcp-channel them us ?) #:meta-level 1)
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(sub (tcp-channel them us ?) #:meta-level 1 #:level 1)
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(pub (tcp-channel us them ?) #:meta-level 1)))))
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(spawn-world
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(spawn-demand-matcher (tcp-channel (?! (tcp-address ? ?)) (?! (tcp-listener 5999)) ?)
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#:meta-level 1
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spawn-session))
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)
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(spawn (lambda (e s)
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;; (log-info "SPY: ~v" e)
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(local-require racket/pretty)
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(match e
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[(message m _ _)
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(pretty-write `(MAIN ,m))]
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[(routing-update g)
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(printf "MAIN gestalt:\n")
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(pretty-print-gestalt g)]
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[_ (void)])
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(flush-output)
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#f)
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(void)
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(gestalt-union (sub ? #:level 5)))
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(gestalt-union
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;;(sub ? #:level 5)
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(sub (tcp-channel ? ? ?) #:level 5)
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))
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284
tcp.rkt
284
tcp.rkt
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@ -21,14 +21,15 @@
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;; tcp-handle/tcp-address : "user" outbound connections
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;; tcp-listener/tcp-address : "user" inbound connections
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Protocol messages
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(struct tcp-address (host port) #:prefab)
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(struct tcp-handle (id) #:prefab)
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(struct tcp-listener (port) #:prefab)
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(struct tcp-channel (source destination subpacket) #:prefab)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(struct tcp-packet (from-wire?
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source-ip
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source-port
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data)
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#:prefab)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; User-accessible driver startup
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(define (spawn-tcp-driver)
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(list (spawn-demand-matcher (tcp-channel ? (?! (tcp-listener ?)) ?)
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#:demand-is-subscription? #t
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#:demand-level 1
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#:supply-level 2
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(lambda (server-addr)
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(match-define (tcp-listener port) server-addr)
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(spawn-demand-matcher
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(tcp-channel (?! (tcp-address ? ?)) (?! (tcp-address ? port)) ?)
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(spawn-relay server-addr))))
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(spawn-demand-matcher (tcp-channel (?! (tcp-handle ?)) (?! (tcp-address ? ?)) ?)
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(lambda (local-addr remote-addr)
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(send (tcp-port-allocation-request local-addr remote-addr))))
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(spawn-port-allocator)
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(spawn-kernel-tcp-driver)))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Port allocator
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(struct tcp-port-allocation-request (local-addr remote-addr) #:prefab)
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(struct port-allocator-state (used-ports local-ips) #:transparent)
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(define (spawn-port-allocator)
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(define port-projector
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(compile-gestalt-projection (tcp-channel (tcp-address (?!) (?!)) (tcp-address (?!) (?!)) ?)))
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(define ip-projector
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(compile-gestalt-projection (ip-interface (?!) ?)))
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;; TODO: Choose a sensible IP address for the outbound connection.
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;; We don't have enough information to do this well at the moment,
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;; so just pick some available local IP address.
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;;
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;; Interesting note: In some sense, the right answer is "?". This
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;; would give us a form of mobility, where IP addresses only route
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;; to a given bucket-of-state and ONLY the port number selects a
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;; substate therein. That's not how TCP is defined however so we
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;; can't do that.
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(define (appropriate-ip s)
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(set-first (port-allocator-state-local-ips s)))
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(spawn (lambda (e s)
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(match e
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[(routing-update g)
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(define extracted-ips (matcher-key-set (gestalt-project g 0 0 #t ip-projector)))
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(define extracted-ports (matcher-key-set (gestalt-project g 0 0 #f port-projector)))
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(if (or (not extracted-ports) (not extracted-ips))
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(error 'tcp "Someone has published a wildcard TCP address or IP interface")
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(transition (let ((local-ips (for/set [(e (in-set extracted-ips))] (car e))))
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(port-allocator-state
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(for/fold [(s (set))] [(e (in-set extracted-ports))]
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(match-define (list si sp di dp) e)
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(let* ((s (if (set-member? local-ips si) (set-add s sp) s))
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(s (if (set-member? local-ips di) (set-add s dp) s)))
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s))
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local-ips))
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'()))]
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[(message (tcp-port-allocation-request local-addr remote-addr) _ _)
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(define currently-used-ports (port-allocator-state-used-ports s))
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(let randomly-allocate-until-unused ()
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(define p (+ 1024 (random 64512)))
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(if (set-member? currently-used-ports p)
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(randomly-allocate-until-unused)
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(transition (struct-copy port-allocator-state s
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[used-ports (set-add currently-used-ports p)])
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((spawn-relay local-addr)
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remote-addr
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(tcp-channel (appropriate-ip s) p)))))]
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[_ #f]))
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(port-allocator-state (set) (set))
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(gestalt-union (sub (tcp-port-allocation-request ? ?))
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(sub (projection->pattern ip-projector) #:level 1)
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(pub (projection->pattern port-projector) #:level 1))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Relay between kernel-level and user-level
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(define ((spawn-relay local-user-addr) remote-addr local-tcp-addr)
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(define local-peer-traffic (pub (tcp-channel remote-addr local-user-addr ?) #:level 1))
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(define remote-peer-traffic (sub (tcp-channel remote-addr local-tcp-addr ?) #:level 1))
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(spawn (lambda (e seen-local-peer?)
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(local-require racket/pretty)
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(pretty-write `(RELAY (local-user-addr ,local-user-addr)
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(remote-addr ,remote-addr)
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(local-tcp-addr ,local-tcp-addr)
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(seen-local-peer? ,seen-local-peer?)
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(e ,e)))
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(flush-output)
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(match e
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[(routing-update g)
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(define local-peer-absent? (gestalt-empty? (gestalt-filter g local-peer-traffic)))
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(transition (or seen-local-peer? (not local-peer-absent?))
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(when (or (and seen-local-peer? local-peer-absent?)
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(gestalt-empty? (gestalt-filter g remote-peer-traffic)))
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(quit)))]
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[(message (tcp-channel (== local-user-addr) (== remote-addr) bs) _ _)
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(transition seen-local-peer? (send (tcp-channel local-tcp-addr remote-addr bs)))]
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[(message (tcp-channel (== remote-addr) (== local-tcp-addr) bs) _ _)
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(transition seen-local-peer? (send (tcp-channel remote-addr local-user-addr bs)))]
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[_ #f]))
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#f
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(gestalt-union local-peer-traffic
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remote-peer-traffic
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(sub (tcp-channel remote-addr local-tcp-addr ?))
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(sub (tcp-channel local-user-addr remote-addr ?))
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(pub (tcp-channel remote-addr local-user-addr ?))
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(pub (tcp-channel local-tcp-addr remote-addr ?)))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Codec & kernel-level driver
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(define PROTOCOL-TCP 6)
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(struct codec-state (active-state-vectors) #:transparent)
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(define (spawn-tcp-driver)
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(define (spawn-kernel-tcp-driver)
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(define (flip-statevec statevec)
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(match-define (list si sp di dp) statevec)
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(let* ((flags (set))
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(statevec (list src-ip src-port dst-ip dst-port))
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(old-active-state-vectors (codec-state-active-state-vectors s))
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(spawn-needed? (not (state-vector-active? statevec s))))
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(spawn-needed? (and (not (state-vector-active? statevec s))
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(zero? rst)))) ;; don't bother spawning if it's a rst
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(define-syntax-rule (set-flags! v ...)
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(begin (unless (zero? v) (set! flags (set-add flags 'v))) ...))
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(set-flags! ns cwr ece urg ack psh rst syn fin)
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#:level 1))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Per-connection state vector process
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(struct buffer (data ;; bit-string
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seqn ;; names leftmost byte in data
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(struct conn-state (outbound ;; buffer
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inbound ;; buffer
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syn-acked? ;; boolean
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latest-activity-time) ;; from current-inexact-milliseconds
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latest-activity-time ;; from current-inexact-milliseconds
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local-peer-seen?) ;; boolean
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#:transparent)
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(define transmit-check-interval-msec 100)
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(define (seq> a b)
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(< (seq- a b) #x80000000))
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;; ConnState -> Gestalt
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(define (compute-gestalt s)
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(gestalt-union (sub (timer-expired (timer-name ?) ?))
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(sub (tcp-packet #t src-ip src-port dst-ip dst-port ? ? ? ? ? ?))
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(pub (tcp-packet #f dst-ip dst-port src-ip src-port ? ? ? ? ? ?))
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(sub (tcp-channel dst src ?))
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(if (not (buffer-finished? (conn-state-inbound s)))
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(pub (tcp-channel src dst ?))
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(gestalt-empty))
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(pub (tcp-channel src dst ?) #:level 1)))
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;; ConnState -> Transition
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(define (deliver-inbound-locally s)
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(define b (conn-state-inbound s))
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(define b (conn-state-inbound s))
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(unless (bit-string-empty? (buffer-data b)) ;; assured by deliver-inbound-locally
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(error 'check-fin "Nonempty inbound buffer"))
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(transition
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(if (set-member? flags 'fin)
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(struct-copy conn-state s
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[inbound (struct-copy buffer b
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[seqn (seq+ (buffer-seqn b) 1)] ;; reliable: count fin as a byte
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[finished? #t])])
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s)
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'()))
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(if (set-member? flags 'fin)
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(let ((new-s (struct-copy conn-state s
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[inbound (struct-copy buffer b
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[seqn (seq+ (buffer-seqn b) 1)] ;; reliable: count fin as a byte
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[finished? #t])])))
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(transition new-s (routing-update (compute-gestalt new-s))))
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(transition s '())))
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;; Boolean Nat -> ConnState -> Transition
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;; Boolean SeqNum -> ConnState -> Transition
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(define ((discard-acknowledged-outbound ack? ackn) s)
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(transition
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(if (not ack?)
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(define (all-output-acknowledged? s)
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(bit-string-empty? (buffer-data (conn-state-outbound s))))
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;; ConnState -> Transition
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;; (Option SeqNum) -> ConnState -> Transition
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(define ((send-outbound old-ackn) s)
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(define b (conn-state-outbound s))
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(define pending-byte-count (max 0 (- (bit-string-byte-count (buffer-data b))
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(if (buffer-finished? b) 1 0))))
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(define segment-size (min maximum-segment-size
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(buffer-window b)
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(if (conn-state-syn-acked? s) (buffer-window b) 1)
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;; ^ can only send SYN until SYN is acked
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pending-byte-count))
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(define segment-offset (if (conn-state-syn-acked? s) 0 1))
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(define-values (chunk0 remaining-data)
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(when (not (conn-state-syn-acked? s))
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(set! flags (set-add flags 'syn)))
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(when (and (buffer-finished? b)
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(conn-state-syn-acked? s)
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(= segment-size pending-byte-count)
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(not (all-output-acknowledged? s)))
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(not (all-output-acknowledged? s))) ;; TODO: reexamine. This looks fishy
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(set! flags (set-add flags 'fin)))
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(define window (min 65535 ;; limit of field width
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(max 0 ;; can't be negative
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(transition s
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(unless (and (equal? ackn old-ackn)
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(conn-state-syn-acked? s)
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(not (set-member? flags 'fin))
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(zero? (bit-string-byte-count chunk)))
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(send (tcp-packet #f
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dst-ip
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dst-port
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src-ip
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src-port
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(local-require racket/pretty)
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(pretty-write `(send-outbound (old-ackn ,old-ackn)
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(s ,s)
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(flags ,flags)))
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(flush-output)
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(send (tcp-packet #f dst-ip dst-port src-ip src-port
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(buffer-seqn b)
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(or ackn 0)
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flags
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;; ConnState -> Transition
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(define (quit-when-done s)
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(if (and (buffer-finished? (conn-state-outbound s))
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(buffer-finished? (conn-state-inbound s))
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(all-output-acknowledged? s)
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(> (- (current-inexact-milliseconds) (conn-state-latest-activity-time s))
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(* 2 1000 maximum-segment-lifetime-sec)))
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(transition s (quit))
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(transition s '())))
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(transition s (when (and (buffer-finished? (conn-state-outbound s))
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(buffer-finished? (conn-state-inbound s))
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(all-output-acknowledged? s)
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(> (- (current-inexact-milliseconds)
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(conn-state-latest-activity-time s))
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(* 2 1000 maximum-segment-lifetime-sec)))
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(quit))))
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;; Action
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(define send-set-transmit-check-timer
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transmit-check-interval-msec
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'relative)))
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;; ConnState -> Transition
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(define (reset seqn ackn is-fin? s)
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(log-warning "Sending RST from ~a:~a to ~a:~a"
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(ip-address->hostname dst-ip)
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dst-port
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(ip-address->hostname src-ip)
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src-port)
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(transition s
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(list
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(send (tcp-packet #f dst-ip dst-port src-ip src-port
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seqn
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(seq+ ackn (if is-fin? 1 0))
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(set 'ack 'rst)
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0
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#""
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#""))
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(quit))))
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;; ConnState -> ConnState
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(define (close-outbound-stream s)
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(transition
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(struct-copy conn-state s
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[outbound (struct-copy buffer (buffer-push (conn-state-outbound s) #"!") ;; dummy FIN byte
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[finished? #t])])
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'()))
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(define (state-vector-behavior e s)
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(define old-ackn (buffer-seqn (conn-state-inbound s)))
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(match e
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[(routing-update g)
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(log-info "State vector routing-update:\n~a" (gestalt->pretty-string g))
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(define local-peer-present? (not (gestalt-empty? g)))
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(cond
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[(and local-peer-present? (not (conn-state-local-peer-seen? s)))
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(transition (struct-copy conn-state s [local-peer-seen? #t]) '())]
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[(and (not local-peer-present?) (conn-state-local-peer-seen? s))
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(log-info "Closing outbound stream.")
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(sequence-transitions (close-outbound-stream s)
|
||||
(send-outbound old-ackn)
|
||||
bump-activity-time
|
||||
quit-when-done)]
|
||||
[else #f])]
|
||||
[(message (tcp-packet #t _ _ _ _ seqn ackn flags window options data) _ _)
|
||||
(define expected (next-expected-seqn s))
|
||||
(sequence-transitions (if (not expected) ;; haven't seen syn yet...
|
||||
(if (set-member? flags 'syn) ;; ... and this is it
|
||||
(incorporate-segment data
|
||||
(set-inbound-seqn (seq+ seqn 1) s))
|
||||
(transition s '()))
|
||||
(if (= expected seqn)
|
||||
(incorporate-segment data s)
|
||||
(transition s '())))
|
||||
deliver-inbound-locally
|
||||
(check-fin flags)
|
||||
(discard-acknowledged-outbound (set-member? flags 'ack) ackn)
|
||||
(update-outbound-window window)
|
||||
(if (and (not expected) ;; no syn yet
|
||||
(not (set-member? flags 'syn))) ;; and this isn't it
|
||||
(reset ackn ;; this is *our* seqn
|
||||
seqn ;; this is what we should acknowledge...
|
||||
(set-member? flags 'fin) ;; ... +1, if fin is set
|
||||
s)
|
||||
(sequence-transitions (cond
|
||||
[(not expected) ;; haven't seen syn yet, but we know this is it
|
||||
(incorporate-segment data (set-inbound-seqn (seq+ seqn 1) s))]
|
||||
[(= expected seqn)
|
||||
(incorporate-segment data s)]
|
||||
[else
|
||||
(transition s '())])
|
||||
deliver-inbound-locally
|
||||
(check-fin flags)
|
||||
(discard-acknowledged-outbound (set-member? flags 'ack) ackn)
|
||||
(update-outbound-window window)
|
||||
(send-outbound old-ackn)
|
||||
bump-activity-time
|
||||
quit-when-done))]
|
||||
[(message (tcp-channel _ _ bs) _ _)
|
||||
(sequence-transitions (transition (struct-copy conn-state s
|
||||
[outbound (buffer-push (conn-state-outbound s) bs)])
|
||||
'())
|
||||
(send-outbound old-ackn)
|
||||
bump-activity-time
|
||||
quit-when-done)]
|
||||
|
@ -412,13 +596,11 @@
|
|||
;; TODO append a dummy byte at FIN position in outbound buffer
|
||||
(list
|
||||
send-set-transmit-check-timer
|
||||
(spawn state-vector-behavior
|
||||
(conn-state (buffer #"!" initial-outbound-seqn 0 #f) ;; dummy data at SYN position
|
||||
(buffer #"" #f inbound-buffer-limit #f)
|
||||
#f
|
||||
(current-inexact-milliseconds))
|
||||
(gestalt-union (sub (timer-expired (timer-name ?) ?))
|
||||
(sub (tcp-packet #t src-ip src-port dst-ip dst-port ? ? ? ? ? ?))
|
||||
(pub (tcp-packet #f dst-ip dst-port src-ip src-port ? ? ? ? ? ?))
|
||||
(sub (tcp-channel dst src ?))
|
||||
(pub (tcp-channel src dst ?))))))
|
||||
(let ((state0 (conn-state (buffer #"!" initial-outbound-seqn 0 #f) ;; dummy data at SYN position
|
||||
(buffer #"" #f inbound-buffer-limit #f)
|
||||
#f
|
||||
(current-inexact-milliseconds)
|
||||
#f)))
|
||||
(spawn state-vector-behavior
|
||||
state0
|
||||
(compute-gestalt state0)))))
|
||||
|
|
Loading…
Reference in New Issue