Remove clutter
This commit is contained in:
Tony Garnock-Jones
parent
f9a1c9a425
commit
20207a9c18
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#lang racket/base
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;; Extensible Denotational Language Specifications
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;; The paper "Extensible Denotational Language Specifications", by
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;; Cartwright & Felleisen (1994), henceforth "EDLS", presents a
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;; picture of an extensible interpreter for programming languages. The
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;; interpreter can be extended with new syntactic forms (and their
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;; meanings), new actions (and their effects), and new kinds of
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;; resources to be placed under its control.
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;; Rather than interpreting an extensible collection of syntax here,
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;; we call Racket code directly. Extension at the syntactic level is
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;; provided by Racket's macros. The purpose of this code is to provide
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;; a structured model of the extensible actions and extensible
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;; resource-management facets of the EDLS design. We use delimited
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;; continuations to transfer control between the "pure" facet (the
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;; interpretation of programs) and the impure or operational facets
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;; (the performing of actions, and management of resources).
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;; TODO: investigate continuation barriers, to avoid throws out
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;; through the current interpreter/VM. Actually, think harder about
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;; what even needs protecting - it's not clear.
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;; TODO: what happens when an interactor, performing an action, raises
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;; an exception? What should happen? In some sense it's the fault of
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;; the invoker of the action, isn't it? Consider binding a UDP socket
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;; to a port already in use. Alternatively, consider some internal
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;; error in the interactor: then it's not the fault of the invoker at
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;; all.
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;; TODO: pull in scheduler and event-stream ideas from Olin's papers
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;; TODO: consider splitting lookup from apply in
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;; action-handlers. Consider, for instance, replicating action
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;; streams: you might want to check for DNU before replicating the
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;; pending action.
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;; TODO: think about using a private prompt tag, and what the
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;; consequences for cross-virtual-level interaction are if multiple
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;; prompt tags are in play. This will force some thinking about
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;; continuation barriers, too.
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;; TODO: think about how a weak table might be exposed as a
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;; resource. Its implementation depends on primitive weakness! (Or on
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;; a transitively-provided weak service.)
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#|
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Things that can wake up some continuations:
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- external events (CML-style, timeouts)
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- internal events (completion of a write or similar)
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- unguarded continuations (spawned threads, basically)
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Are these containery things the conversation/chatrooms of racket-ssh?
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|#
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;; From the fine manual: "The protocol for vs supplied to an abort is
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;; specific to the prompt-tag. When abort-current-continuation is used
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;; with (default-continuation-prompt-tag), generally, a single thunk
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;; should be supplied that is suitable for use with the default prompt
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;; handler. Similarly, when call-with-continuation-prompt is used with
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;; (default-continuation-prompt-tag), the associated handler should
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;; generally accept a single thunk argument."
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;; Semantic framework from EDLS:
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;;
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;; computation : (+ (make-value value) (make-effect action (-> value computation)))
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;; program-meaning : (-> program (* (+ value error) resources)
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;; expression-meaning : (-> expr env computation)
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;; admin : (-> (* computation resources) (* (+ value error) resources))
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;; handler : (-> computation (-> value computation) computation)
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;;
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;; Handler is used to stitch stack frames together into a composed
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;; continuation, something that we're doing here natively with
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;; Racket's composable continuations.
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;;
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;; If we're going to make values self-representing, then we need to
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;; ensure that all effects are disjoint from values. The way to do
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;; that is to control the abort/prompt-tag protocol closely, so that
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;; regular values returned are distinguished from actions thrown. That
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;; way, no value is forbidden to the userland, including descriptions
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;; of actions.
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;; Can we say that the *communications facility* in EDLS is
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;; underpowered? It's point-to-point and relies on noninterference
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;; between action-handling extensions. Since each extension is
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;; logically managing its own resources, it feels like we have a kind
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;; of network-layer here IF we enforce separation of the managed
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;; resources so there are no cross-channels.
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;;
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;; The reason I'm interested in this approach is to get some kind of
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;; objcap-oriented interface not only to the substrate but to the
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;; extensions embedded in the substrate. Consider the DNS-server case,
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;; where a socket needs to be opened and then straight-line
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;; interactions with the socket take place. Now consider the DNS-proxy
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;; case, where not only does a socket (or more than one!) need to be
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;; created, but complex conversional contexts are built up as each
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;; query arrives and is processed. As DJB observes, a single query can
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;; in principle result in unbounded recursion as "glue" records are
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;; looked up. It kind of makes sense to have each conversational
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;; context as a separate entity, managing its own resources, embedded
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;; in the substrate.
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(require racket/match)
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(require racket/class)
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(define interactor<%>
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(interface ()
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perform-action))
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(define action-prompt (make-continuation-prompt-tag 'interactor-action))
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(define (perform-action . action-pieces)
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(call-with-composable-continuation
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(lambda (k)
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(abort-current-continuation action-prompt
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(lambda () (values action-pieces k))))
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action-prompt))
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(define (run/interactor boot interactor)
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(call-with-continuation-barrier
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(lambda ()
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(let loop ((next-step-thunk (lambda () (values (boot) #f)))
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(interactor interactor))
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(define-values (computation-step-result computation-step-continuation)
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(call-with-continuation-prompt next-step-thunk action-prompt))
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(cond
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((eq? computation-step-continuation #f)
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;; The computation is finished, and has yielded a result.
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computation-step-result)
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(else
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;; The computation is not finished, but is waiting for an
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;; action to complete.
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(send interactor perform-action
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computation-step-result
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(lambda (action-result-value new-interactor)
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(loop (lambda () (computation-step-continuation action-result-value))
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new-interactor))
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(lambda ()
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(error 'run/interactor "Action not interpretable by context: ~v"
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computation-step-result)))))))))
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(define cells%
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(class* object% (interactor<%>)
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(init-field next-name)
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(init-field mapping)
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(super-new)
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(define/public (perform-action action k-ok k-dnu)
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(match action
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(`(new ,initial-value)
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(k-ok next-name (make-object cells%
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(+ next-name 1)
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(hash-set mapping next-name initial-value))))
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(`(get ,n)
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(if (hash-has-key? mapping n)
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(k-ok (hash-ref mapping n) this)
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(error 'cells% "Cell name ~v not found (on get)" n)))
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(`(set ,n ,new-value)
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(if (hash-has-key? mapping n)
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(k-ok new-value (make-object cells%
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next-name
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(hash-set mapping n new-value)))
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(error 'cells% "Cell name ~v not found (on set)" n)))
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(else
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(k-dnu))))))
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(define (new-cell [initial-value (void)])
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(perform-action 'new initial-value))
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(define (get-cell c)
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(perform-action 'get c))
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(define (set-cell! c v)
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(perform-action 'set c v))
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(define (empty-cells)
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(make-object cells% 0 (hash)))
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(define combine%
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(class* object% (interactor<%>)
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(init-field children)
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(super-new)
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(define/public (perform-action action k-ok k-dnu)
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(let search ((remaining children)
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(examined '()))
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(cond
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((null? remaining) (k-dnu))
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(else
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(define child (car remaining))
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(define rest (cdr remaining))
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(send child perform-action
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action
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(lambda (result new-child)
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(k-ok result
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(make-object combine% (append (reverse examined) (cons new-child rest)))))
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(lambda ()
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(search rest (cons child examined))))))))))
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(define (combine-interactors is)
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(make-object combine% is))
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(define udp%
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(class* object% (interactor<%>)
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(struct handle (socket)) ;; generative: new predicate etc. per udp% instance!
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(super-new)
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(define/public (perform-action action k-ok k-dnu)
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(match action
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(`(new)
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(k-ok (handle (udp-open-socket #f #f)) this))
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(`(bind ,(handle s) ,port)
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(k-ok (udp-bind! s #f port) this))
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(`(send ,(handle s) ,host ,port ,packet)
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(k-ok (udp-send-to s host port packet) this))
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(`(recv ,(handle s) ,packet-size-limit)
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(define buffer (make-bytes packet-size-limit))
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(define-values (packet-length source-hostname source-port)
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(udp-receive! s buffer))
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(k-ok (list source-hostname source-port (subbytes buffer 0 packet-length)) this))
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(else (k-dnu))))))
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(run/interactor (lambda () 1234)
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(empty-cells))
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(run/interactor (lambda ()
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(let ((x (new-cell)))
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(set-cell! x 1)
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(set-cell! x (+ 1 (get-cell x)))
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(+ 1000 (get-cell x))))
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(empty-cells))
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(run/interactor (lambda ()
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(let ((x (new-cell 'initial-x-value))
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(y (new-cell 'initial-y-value)))
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(set-cell! x 1)
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(set-cell! y 1000)
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(set-cell! x (+ 1 (get-cell x)))
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(+ (get-cell x)
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(get-cell y))))
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(combine-interactors (list (empty-cells))))
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@ -1,25 +0,0 @@
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(require srfi/1)
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(define (c v acc) acc)
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(define (c v acc) (choice-evt never-evt acc))
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(define (c v acc) (choice-evt (handle-evt always-evt void) acc))
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(define-values (c1 c2) (values values list))
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(define-values (c1 c2) (values (lambda (i) never-evt) choice-evt))
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(define-values (c1 c2) (values (lambda (i) (handle-evt always-evt void)) choice-evt))
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(for-each (lambda (n)
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(define limit (* 128 (expt 2 n)))
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(write limit)
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(newline)
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(time (do ((i 0 (+ i 1))
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(e never-evt (c i e)))
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((= i limit) e))))
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(iota 16))
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(for-each (lambda (n)
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(define limit (* 128 (expt 2 n)))
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(write limit)
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(newline)
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(time (apply c2 (map c1 (iota limit)))))
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(iota 16))
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@ -1,42 +0,0 @@
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#lang racket/base
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(require "os-big-bang.rkt")
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(require "os-udp.rkt")
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(require "os-timer.rkt" racket/match)
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(define getter
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(os-big-bang 'none
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(send-message `(request create-echo-socket (udp new 0 65536)))
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(subscribe/fresh sub
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(message-handlers w
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[`(reply create-echo-socket ,sname)
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(transition w
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(unsubscribe sub)
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(send-message (udp-packet sname (udp-address "127.0.0.1" 5678) #"get"))
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(send-message (set-timer 'timeout 500 #t))
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(subscribe 'reply-waiter
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(message-handlers w
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[(udp-packet source (== sname) reply-bytes)
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(define counter (integer-bytes->integer reply-bytes #f))
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(write counter)
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(newline)
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(transition w
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(send-message 'quit)
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(unsubscribe 'reply-waiter))]
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[(timer-expired 'timeout _)
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(write 'timed-out)
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(newline)
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(transition w
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(send-message 'quit)
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(unsubscribe 'reply-waiter))])))]))))
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(ground-vm
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(os-big-bang 'none
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(spawn (os-big-bang 'none
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(subscribe 'quit-waiter
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(message-handlers w
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['quit
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(exit)]))))
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(spawn udp-driver)
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(spawn (timer-driver))
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(spawn getter)))
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@ -1,14 +0,0 @@
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#lang racket/base
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(require racket/match)
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(require racket/udp)
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(define s (udp-open-socket #f #f))
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(udp-send-to s "127.0.0.1" 5678 #"get")
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(define buffer (make-bytes 8))
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(sync/timeout 0.5
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(wrap-evt (udp-receive!-evt s buffer)
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(match-lambda
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[(list 8 _ _)
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(write (integer-bytes->integer buffer #f))
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(newline)])))
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@ -1,24 +0,0 @@
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#lang racket/base
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(require racket/match)
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(require racket/udp)
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(define s (udp-open-socket #f #f))
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(define buffer (make-bytes 8))
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(define nrepeats 3500)
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(for-each
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(lambda (x) (write `(,x milliseconds in ,nrepeats repeats =
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,(exact->inexact (/ x nrepeats)))) (newline))
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(cdr
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(call-with-values (lambda ()
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(time-apply
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(lambda ()
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(for ([i (in-range nrepeats)])
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(udp-send-to s "127.0.0.1" 5678 #"get")
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(sync/timeout 0.5
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(wrap-evt (udp-receive!-evt s buffer)
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(match-lambda
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[(list 8 _ _) 'ok])))))
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'()))
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list)))
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@ -1,25 +0,0 @@
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#lang racket
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(require "os-big-bang.rkt")
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(require "os-udp.rkt")
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(define counter
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(os-big-bang 0
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(send-message `(request create-echo-socket (udp new 5678 65536)))
|
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(subscribe/fresh sub
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(message-handlers current-counter
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[`(reply create-echo-socket ,sname)
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(transition current-counter
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(unsubscribe sub)
|
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(subscribe 'packet-handler
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(message-handlers current-counter
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[(udp-packet source (== sname) #"get")
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(transition (+ current-counter 1)
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(send-message
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(udp-packet sname source
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(integer->integer-bytes current-counter 8 #f))))])))]))))
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|
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(ground-vm
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(os-big-bang 'none
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(spawn udp-driver)
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(spawn counter)))
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|
|
@ -1,29 +0,0 @@
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#lang racket
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(require "os-big-bang.rkt")
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(require "os-udp.rkt")
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(define (counter server-socket)
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(os-big-bang 0
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(subscribe 'packet-handler
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(message-handlers current-counter
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[(udp-packet source (== server-socket) #"get")
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(transition (+ current-counter 1)
|
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(send-message
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(udp-packet server-socket source
|
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(integer->integer-bytes current-counter 8 #f))))]))))
|
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|
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(define main
|
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(os-big-bang 'no-state
|
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(send-message `(request create-echo-socket (udp new 5678 65536)))
|
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(subscribe/fresh sub
|
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(message-handlers w
|
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[`(reply create-echo-socket ,server-socket)
|
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(transition w
|
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(unsubscribe sub)
|
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(spawn (counter server-socket)))]))))
|
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|
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(ground-vm
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(os-big-bang 'none
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(spawn udp-driver)
|
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(spawn main)))
|
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|
|
@ -1,619 +0,0 @@
|
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#lang racket/base
|
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|
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(require (planet tonyg/bitsyntax))
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(require racket/udp)
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(require racket/match)
|
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|
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(require "mapping.rkt")
|
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|
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;; Protocol data taken from RFC-1035. (See also RFC-1034.)
|
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;; Blocks of text inside <rfc1035>...</rfc1035> also from RFC-1035.
|
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;; RFC-3596 specifies "DNS Extensions to Support IP Version 6".
|
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|
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;; RFC-2782 specifies the DNS SRV record, though weirdly it omits a
|
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;; wire-level definition of the format! Presumably people have just
|
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;; copied what they see everyone else do here!
|
||||
|
||||
(provide (struct-out dns-message)
|
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(struct-out question)
|
||||
(struct-out rr)
|
||||
(struct-out hinfo)
|
||||
(struct-out minfo)
|
||||
(struct-out mx)
|
||||
(struct-out soa)
|
||||
(struct-out wks)
|
||||
(struct-out srv)
|
||||
|
||||
value->query-opcode query-opcode->value
|
||||
value->query-response-code query-response-code->value
|
||||
type->value value->type
|
||||
qtype->value value->qtype
|
||||
class->value value->class
|
||||
qclass->value value->qclass
|
||||
|
||||
packet->dns-message
|
||||
dns-message->packet
|
||||
|
||||
make-dns-query
|
||||
make-dns-response
|
||||
|
||||
raw-dns-query)
|
||||
|
||||
;;---------------------------------------------------------------------------
|
||||
;; Data definitions
|
||||
|
||||
;; A DomainName is a ListOf<Bytes>, representing a domain name. The
|
||||
;; head of the list is the leftmost label; for example, www.google.com
|
||||
;; is represented as '(#"www" #"google" #"com").
|
||||
|
||||
;; A ShortString is a String with length 255 or shorter.
|
||||
|
||||
;; An IPv4 is a (vector Byte Byte Byte Byte), representing an IPv4
|
||||
;; address. For example, 127.0.0.1 is represented as (vector 127 0 0
|
||||
;; 1).
|
||||
|
||||
;; An IPv6 is a Vector of length 16 containing Bytes, representing an
|
||||
;; IPv6 address. For example, 2001:0db8:85a3:0000:0000:8a2e:0370:7334
|
||||
;; is represented as (vector #x20 #x01 #x0d #xb8 #x85 #xa3 #x00 #x00
|
||||
;; #x00 #x00 #x8a #x2e #x03 #x70 #x73 #x34).
|
||||
|
||||
;; A DNSMessage is a
|
||||
;; (dns-message Uint16 Direction Opcode Authoritativeness
|
||||
;; Truncatedness RecursionDesired RecursionAvailable ResponseCode
|
||||
;; ListOf<Question> ListOf<RR> ListOf<RR> ListOf<RR>).
|
||||
;;
|
||||
;; Interpreted as either a DNS request or reply, depending on the
|
||||
;; Direction.
|
||||
(struct dns-message (id
|
||||
direction
|
||||
opcode
|
||||
authoritative
|
||||
truncated
|
||||
recursion-desired
|
||||
recursion-available
|
||||
response-code
|
||||
questions
|
||||
answers
|
||||
authorities
|
||||
additional)
|
||||
#:transparent)
|
||||
|
||||
;; A Question is a (question DomainName QueryType QueryClass),
|
||||
;; representing a DNS question: "What are the RRs for the given name,
|
||||
;; type and class?"
|
||||
(struct question (name type class) #:transparent)
|
||||
|
||||
;; An RR is a (rr DomainName RRType RRClass Uint32 RData),
|
||||
;; representing a resource record.
|
||||
(struct rr (name type class ttl rdata) #:transparent)
|
||||
|
||||
;; An RData is one of
|
||||
;; - an IPv4, an "A" record
|
||||
;; - an IPv6, an "AAAA" record
|
||||
;; - (hinfo ShortString ShortString), a host information record [O]
|
||||
;; - (minfo DomainName DomainName), a mailbox information record [O]
|
||||
;; - (mx Uint16 DomainName), a mail exchanger record
|
||||
;; - (soa DomainName DomainName Uint32 Uint32 Uint32 Uint32 Uint32), a
|
||||
;; start-of-authority record
|
||||
;; - (wks IPv4 Byte Bytes), a Well-Known Service [O]
|
||||
;; - (srv Uint16 Uint16 Uint16 DomainName), an "SRV" record
|
||||
;;
|
||||
;; In each case, the RData's variant MUST line up correctly with the
|
||||
;; type field of any RR containing it.
|
||||
;;
|
||||
;; Many of these variants are obsolete in today's DNS database (marked
|
||||
;; [O] above).
|
||||
(struct hinfo (cpu os) #:transparent)
|
||||
(struct minfo (rmailbx emailbx) #:transparent)
|
||||
(struct mx (preference exchange) #:transparent)
|
||||
(struct soa (mname rname serial refresh retry expire minimum) #:transparent)
|
||||
(struct wks (address protocol bitmap) #:transparent)
|
||||
(struct srv (priority weight port target) #:transparent)
|
||||
|
||||
;; An Opcode is a Symbol or a Number, one of the possibilities given
|
||||
;; in the following define-mapping. It represents a DNS message
|
||||
;; operation; see the RFC for details.
|
||||
(define-mapping value->query-opcode query-opcode->value
|
||||
#:forward-default values
|
||||
#:backward-default values
|
||||
(0 query)
|
||||
(1 iquery)
|
||||
(2 status))
|
||||
|
||||
;; A ResponseCode is a Symbol or a Number, one of the possibilities
|
||||
;; given in the following define-mapping. It represents the outcome of
|
||||
;; a DNS query.
|
||||
(define-mapping value->query-response-code query-response-code->value
|
||||
(0 no-error)
|
||||
(1 format-error)
|
||||
(2 server-failure)
|
||||
(3 name-error)
|
||||
(4 not-implemented)
|
||||
(5 refused))
|
||||
|
||||
;; An RRType is a Symbol or a Number, one of the possibilities given
|
||||
;; in the following define-mapping. It represents the type of an
|
||||
;; RR. When used in an RR with an RData, the RRType and the RData
|
||||
;; variant must correspond.
|
||||
(define-mapping type->value value->type
|
||||
#:forward-default values
|
||||
#:backward-default values
|
||||
(a 1)
|
||||
(ns 2)
|
||||
(md 3)
|
||||
(mf 4)
|
||||
(cname 5)
|
||||
(soa 6)
|
||||
(mb 7)
|
||||
(mg 8)
|
||||
(mr 9)
|
||||
(null 10)
|
||||
(wks 11)
|
||||
(ptr 12)
|
||||
(hinfo 13)
|
||||
(minfo 14)
|
||||
(mx 15)
|
||||
(txt 16)
|
||||
(aaaa 28)
|
||||
(srv 33))
|
||||
|
||||
;; A QueryType is a Symbol or Number (as given in the following
|
||||
;; define-mapping) or an RRType. It specifies the kinds of records
|
||||
;; being sought after in a DNS query.
|
||||
(define-mapping qtype->value value->qtype
|
||||
#:forward-default type->value
|
||||
#:backward-default value->type
|
||||
(axfr 252)
|
||||
(mailb 253)
|
||||
(maila 254)
|
||||
(* 255))
|
||||
|
||||
;; An RRClass is a Symbol or a Number, one of the possibilities given
|
||||
;; in the following define-mapping. It represents the "class" of DNS
|
||||
;; records being discussed. All classes except 'in are obsolete in
|
||||
;; today's DNS databases.
|
||||
(define-mapping class->value value->class
|
||||
#:forward-default values
|
||||
#:backward-default values
|
||||
(in 1)
|
||||
(cs 2)
|
||||
(ch 3)
|
||||
(hs 4))
|
||||
|
||||
;; A QueryClass is a Symbol or Number (as given in the following
|
||||
;; define-mapping) or an RRClass. It specifies the "class" of records
|
||||
;; being sought after in a DNS query.
|
||||
(define-mapping qclass->value value->qclass
|
||||
#:forward-default class->value
|
||||
#:backward-default value->class
|
||||
(* 255))
|
||||
|
||||
;;---------------------------------------------------------------------------
|
||||
;; DNS message codec
|
||||
|
||||
;; <rfc1035>
|
||||
;; All communications inside of the domain protocol are carried in a single
|
||||
;; format called a message. The top level format of message is divided
|
||||
;; into 5 sections (some of which are empty in certain cases) shown below:
|
||||
;;
|
||||
;; +---------------------+
|
||||
;; | Header |
|
||||
;; +---------------------+
|
||||
;; | Question | the question for the name server
|
||||
;; +---------------------+
|
||||
;; | Answer | RRs answering the question
|
||||
;; +---------------------+
|
||||
;; | Authority | RRs pointing toward an authority
|
||||
;; +---------------------+
|
||||
;; | Additional | RRs holding additional information
|
||||
;; +---------------------+
|
||||
;; </rfc1035>
|
||||
|
||||
;; <rfc1035>
|
||||
;; The header contains the following fields:
|
||||
;;
|
||||
;; 1 1 1 1 1 1
|
||||
;; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | ID |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; |QR| Opcode |AA|TC|RD|RA| Z | RCODE |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | QDCOUNT |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | ANCOUNT |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | NSCOUNT |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | ARCOUNT |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; </rfc1035>
|
||||
|
||||
(define (bit->value n if0 if1)
|
||||
(if (positive? n) if1 if0))
|
||||
|
||||
(define (value->bit b if0 if1)
|
||||
(cond
|
||||
((eq? b if0) 0)
|
||||
((eq? b if1) 1)
|
||||
(else (error 'value->bit "Value supplied is neither ~v nor ~v: ~v" if0 if1 b))))
|
||||
|
||||
(define (packet->dns-message packet)
|
||||
(bit-string-case packet
|
||||
([ (id :: bits 16)
|
||||
(qr :: bits 1)
|
||||
(opcode :: bits 4)
|
||||
(aa :: bits 1)
|
||||
(tc :: bits 1)
|
||||
(rd :: bits 1)
|
||||
(ra :: bits 1)
|
||||
(= 0 :: bits 3)
|
||||
(rcode :: bits 4)
|
||||
(qdcount :: bits 16)
|
||||
(ancount :: bits 16)
|
||||
(nscount :: bits 16)
|
||||
(arcount :: bits 16)
|
||||
(sections4 :: binary) ]
|
||||
(let*-values (((q-section sections3)
|
||||
(parse-section packet decode-question qdcount sections4))
|
||||
((a-section sections2)
|
||||
(parse-section packet decode-rr ancount sections3))
|
||||
((auth-section sections1)
|
||||
(parse-section packet decode-rr nscount sections2))
|
||||
((additional-section sections0)
|
||||
(parse-section packet decode-rr arcount sections1)))
|
||||
(when (not (zero? (bit-string-length sections0)))
|
||||
(error 'packet->dns-message "Packet too long"))
|
||||
(dns-message id
|
||||
(bit->value qr 'request 'response)
|
||||
(value->query-opcode opcode)
|
||||
(bit->value aa 'non-authoritative 'authoritative)
|
||||
(bit->value tc 'not-truncated 'truncated)
|
||||
(bit->value rd 'no-recursion-desired 'recursion-desired)
|
||||
(bit->value ra 'no-recursion-available 'recursion-available)
|
||||
(value->query-response-code rcode)
|
||||
q-section
|
||||
a-section
|
||||
auth-section
|
||||
additional-section)))))
|
||||
|
||||
(define (dns-message->packet m)
|
||||
(bit-string->bytes
|
||||
(bit-string ((dns-message-id m) :: bits 16)
|
||||
((value->bit (dns-message-direction m)
|
||||
'request 'response) :: bits 1)
|
||||
((query-opcode->value (dns-message-opcode m)) :: bits 4)
|
||||
((value->bit (dns-message-authoritative m)
|
||||
'non-authoritative 'authoritative) :: bits 1)
|
||||
((value->bit (dns-message-truncated m)
|
||||
'not-truncated 'truncated) :: bits 1)
|
||||
((value->bit (dns-message-recursion-desired m)
|
||||
'no-recursion-desired 'recursion-desired) :: bits 1)
|
||||
((value->bit (dns-message-recursion-available m)
|
||||
'no-recursion-available 'recursion-available) :: bits 1)
|
||||
(0 :: bits 3)
|
||||
((query-response-code->value (dns-message-response-code m)) :: bits 4)
|
||||
((length (dns-message-questions m)) :: bits 16)
|
||||
((length (dns-message-answers m)) :: bits 16)
|
||||
((length (dns-message-authorities m)) :: bits 16)
|
||||
((length (dns-message-additional m)) :: bits 16)
|
||||
((bit-string-append
|
||||
(encode-section encode-question (dns-message-questions m))
|
||||
(encode-section encode-rr (dns-message-answers m))
|
||||
(encode-section encode-rr (dns-message-authorities m))
|
||||
(encode-section encode-rr (dns-message-additional m))) :: binary))))
|
||||
|
||||
(define (parse-section packet parser remaining-records input)
|
||||
(let loop ((count remaining-records)
|
||||
(input input))
|
||||
(cond
|
||||
((positive? count)
|
||||
(let*-values (((record remainder) (parser packet input))
|
||||
((records final-remainder) (loop (sub1 count) remainder)))
|
||||
(values (cons record records) final-remainder)))
|
||||
(else
|
||||
(values '() input)))))
|
||||
|
||||
(define (encode-section encoder records)
|
||||
(cond
|
||||
((null? records) (bytes))
|
||||
((null? (cdr records)) (encoder (car records)))
|
||||
(else (bit-string-append (encoder (car records))
|
||||
(encode-section encoder (cdr records))))))
|
||||
|
||||
;; Domain-names use a strange "compressed" encoding.
|
||||
;; We have to be careful not to get stuck in a pointer loop here.
|
||||
|
||||
(define (parse-domain-name whole-packet input pointers-followed)
|
||||
(bit-string-case input
|
||||
|
||||
([(= 3 :: bits 2) (offset :: bits 14) (rest :: binary)]
|
||||
(if (member offset pointers-followed)
|
||||
(error 'parse-domain-name "DNS compressed-pointer loop detected")
|
||||
(let-values (((lhs rhs) (bit-string-split-at whole-packet (* 8 offset))))
|
||||
(let-values (((labels ignored-tail)
|
||||
(parse-domain-name whole-packet rhs (cons offset pointers-followed))))
|
||||
(values labels rest)))))
|
||||
|
||||
([(= 0 :: bits 8) (rest :: binary)]
|
||||
(values '() rest))
|
||||
|
||||
([(= 0 :: bits 2) (len :: bits 6) (label :: binary bytes len) (rest :: binary)]
|
||||
;; TODO: validate labels: make sure they conform to the prescribed syntax
|
||||
(let-values (((labels leftover)
|
||||
(parse-domain-name whole-packet rest pointers-followed)))
|
||||
(values (cons (bit-string->bytes label) labels) leftover)))))
|
||||
|
||||
(define (parse-single-domain-name whole-packet input)
|
||||
(let-values (((name remainder) (parse-domain-name whole-packet input '())))
|
||||
(if (bit-string-empty? remainder)
|
||||
name
|
||||
(error 'parse-single-domain-name
|
||||
"Expected just the one name, but got some trailing junk"))))
|
||||
|
||||
(define (extract-domain-names whole-packet input)
|
||||
(if (bit-string-empty? input)
|
||||
(let-values (((name remainder) (parse-domain-name whole-packet input '())))
|
||||
(cons name (extract-domain-names whole-packet remainder)))
|
||||
'()))
|
||||
|
||||
(define (encode-domain-name labels)
|
||||
(cond
|
||||
((null? labels) (bytes 0))
|
||||
(else (bit-string-append (encode-label (car labels))
|
||||
(encode-domain-name (cdr labels))))))
|
||||
|
||||
(define (encode-label label)
|
||||
(encode-pascal-string "Label" 64 label))
|
||||
|
||||
(define (encode-pascal-string string-kind length-limit s)
|
||||
(let ((len (bytes-length s)))
|
||||
(when (>= len length-limit)
|
||||
(error 'encode-pascal-string "~s too long: ~v" string-kind s))
|
||||
(bytes-append (bytes len) s)))
|
||||
|
||||
;; Character strings are pascal-style length-byte-prefixed strings.
|
||||
|
||||
(define (extract-character-strings input)
|
||||
(bit-string-case input
|
||||
([]
|
||||
'())
|
||||
([len (body :: binary bytes len) (rest :: binary)]
|
||||
(cons (bit-string->bytes body)
|
||||
(extract-character-strings rest)))))
|
||||
|
||||
(define (encode-character-string bs)
|
||||
(encode-pascal-string "Character-string" 256 bs))
|
||||
|
||||
;; <rfc1035>
|
||||
;; The question section is used to carry the "question" in most queries,
|
||||
;; i.e., the parameters that define what is being asked. The section
|
||||
;; contains QDCOUNT (usually 1) entries, each of the following format:
|
||||
;;
|
||||
;; 1 1 1 1 1 1
|
||||
;; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | |
|
||||
;; / QNAME /
|
||||
;; / /
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | QTYPE |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | QCLASS |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; </rfc1035>
|
||||
|
||||
(define (decode-question whole-packet input)
|
||||
(let-values (((qname remainder) (parse-domain-name whole-packet input '())))
|
||||
(bit-string-case remainder
|
||||
([(qtype :: bits 16)
|
||||
(qclass :: bits 16)
|
||||
(tail :: binary)]
|
||||
(values (question qname
|
||||
(value->qtype qtype)
|
||||
(value->qclass qclass))
|
||||
tail)))))
|
||||
|
||||
(define (encode-question q)
|
||||
(bit-string-append (encode-domain-name (question-name q))
|
||||
(bit-string ((qtype->value (question-type q)) :: bits 16)
|
||||
((qclass->value (question-class q)) :: bits 16))))
|
||||
|
||||
;; <rfc1035>
|
||||
;; All RRs have the same top level format shown below:
|
||||
;;
|
||||
;; 1 1 1 1 1 1
|
||||
;; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | |
|
||||
;; / /
|
||||
;; / NAME /
|
||||
;; | |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | TYPE |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | CLASS |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | TTL |
|
||||
;; | |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; | RDLENGTH |
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
|
||||
;; / RDATA /
|
||||
;; / /
|
||||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; </rfc1035>
|
||||
|
||||
(define (decode-rr whole-packet input)
|
||||
(let-values (((name remainder) (parse-domain-name whole-packet input '())))
|
||||
(bit-string-case remainder
|
||||
([(type-number :: bits 16)
|
||||
(class :: bits 16)
|
||||
(ttl :: bits 32)
|
||||
(rdlength :: bits 16)
|
||||
(rdata :: binary bytes rdlength)
|
||||
(tail :: binary)]
|
||||
(let ((type (value->type type-number)))
|
||||
(values (rr name
|
||||
type
|
||||
(value->class class)
|
||||
ttl
|
||||
(decode-rdata whole-packet type rdata))
|
||||
tail))))))
|
||||
|
||||
(define (decode-rdata whole-packet type rdata)
|
||||
(case type
|
||||
((cname mb md mf mg mr ns ptr) (parse-single-domain-name whole-packet rdata))
|
||||
((hinfo) (apply hinfo (extract-character-strings rdata)))
|
||||
((minfo) (apply minfo (extract-domain-names whole-packet rdata)))
|
||||
((mx) (bit-string-case rdata
|
||||
([(preference :: bits 16) (exchange :: binary)]
|
||||
(mx preference (parse-single-domain-name whole-packet exchange)))))
|
||||
((null) (bit-string->bytes rdata))
|
||||
((soa) (let*-values (((mname rdata1) (parse-domain-name whole-packet rdata '()))
|
||||
((rname rdata2) (parse-domain-name whole-packet rdata1 '())))
|
||||
(bit-string-case rdata2
|
||||
([(serial :: bits 32)
|
||||
(refresh :: bits 32)
|
||||
(retry :: bits 32)
|
||||
(expire :: bits 32)
|
||||
(minimum :: bits 32)]
|
||||
(soa mname rname serial refresh retry expire minimum)))))
|
||||
((txt) (extract-character-strings rdata))
|
||||
((a) (bit-string-case rdata
|
||||
([a b c d]
|
||||
(vector a b c d))))
|
||||
((aaaa) (bit-string-case rdata
|
||||
([(ipv6-addr :: binary bits 128)]
|
||||
(list->vector (bytes->list (bit-string->bytes ipv6-addr))))))
|
||||
((wks) (bit-string-case rdata
|
||||
([a b c d protocol (bitmap :: binary)]
|
||||
(wks (vector a b c d) protocol bitmap))))
|
||||
((srv) (bit-string-case rdata
|
||||
([(priority :: bits 16)
|
||||
(weight :: bits 16)
|
||||
(port :: bits 16)
|
||||
(target :: binary)]
|
||||
(srv priority weight port (parse-single-domain-name whole-packet target)))))
|
||||
(else (bit-string->bytes rdata))))
|
||||
|
||||
(define (encode-rr rr)
|
||||
(let ((encoded-rdata (encode-rdata (rr-type rr) (rr-rdata rr))))
|
||||
(bit-string-append (encode-domain-name (rr-name rr))
|
||||
(bit-string ((type->value (rr-type rr)) :: bits 16)
|
||||
((class->value (rr-class rr)) :: bits 16)
|
||||
((rr-ttl rr) :: bits 32)
|
||||
((/ (bit-string-length encoded-rdata) 8) :: bits 16)
|
||||
(encoded-rdata :: binary)))))
|
||||
|
||||
(define (encode-rdata type rdata)
|
||||
(case type
|
||||
((cname mb md mf mg mr ns ptr) (encode-domain-name rdata))
|
||||
((hinfo) (bit-string-append (encode-character-string (hinfo-cpu rdata))
|
||||
(encode-character-string (hinfo-os rdata))))
|
||||
((minfo) (bit-string-append (encode-character-string (minfo-rmailbx rdata))
|
||||
(encode-character-string (minfo-emailbx rdata))))
|
||||
((mx) (bit-string ((mx-preference rdata) :: bits 16)
|
||||
((encode-domain-name (mx-exchange rdata)) :: binary)))
|
||||
((null) rdata)
|
||||
((soa) (bit-string-append (encode-domain-name (soa-mname rdata))
|
||||
(encode-domain-name (soa-rname rdata))
|
||||
(bit-string ((soa-serial rdata) :: bits 32)
|
||||
((soa-refresh rdata) :: bits 32)
|
||||
((soa-retry rdata) :: bits 32)
|
||||
((soa-expire rdata) :: bits 32)
|
||||
((soa-minimum rdata) :: bits 32))))
|
||||
((txt)
|
||||
;; TODO: write and use bit-string-append* instead of using apply here
|
||||
(foldl (lambda (s acc) (bit-string-append acc (encode-character-string s)))
|
||||
(car rdata)
|
||||
(cdr rdata)))
|
||||
((a) (match rdata ((vector a b c d) (bit-string a b c d))))
|
||||
((aaaa) (bit-string ((list->bytes (vector->list rdata)) :: binary bits 128)))
|
||||
((wks) (match (wks-address rdata)
|
||||
((vector a b c d)
|
||||
(bit-string a b c d (wks-protocol rdata) ((wks-bitmap rdata) :: binary)))))
|
||||
((srv) (bit-string ((srv-priority rdata) :: bits 16)
|
||||
((srv-weight rdata) :: bits 16)
|
||||
((srv-port rdata) :: bits 16)
|
||||
((encode-domain-name (srv-target rdata)) :: binary)))
|
||||
(else rdata)))
|
||||
|
||||
;;---------------------------------------------------------------------------
|
||||
|
||||
(define (make-dns-query questions
|
||||
[recursion-desired 'no-recursion-desired])
|
||||
(dns-message (random 65536)
|
||||
'request
|
||||
'query
|
||||
'non-authoritative
|
||||
'not-truncated
|
||||
recursion-desired
|
||||
'no-recursion-available
|
||||
'no-error
|
||||
questions
|
||||
'()
|
||||
'()
|
||||
'()))
|
||||
|
||||
(define (make-dns-response query response-code answers authoritative
|
||||
[recursion-available 'no-recursion-available]
|
||||
[authorities '()]
|
||||
[additional '()])
|
||||
(dns-message (dns-message-id query)
|
||||
'response
|
||||
(dns-message-opcode query)
|
||||
authoritative
|
||||
'not-truncated
|
||||
(dns-message-recursion-desired query)
|
||||
recursion-available
|
||||
response-code
|
||||
(dns-message-questions query)
|
||||
answers
|
||||
authorities
|
||||
additional))
|
||||
|
||||
(define (next-timeout timeout)
|
||||
(case timeout
|
||||
((3) 11)
|
||||
((11) 45)
|
||||
((45) #f)))
|
||||
|
||||
(define *total-port-finding-attempts* 100) ;; TODO: eliminate arbitrary 100?
|
||||
|
||||
(define (bind-to-random-port! s)
|
||||
(let find-a-port ((remaining-tries *total-port-finding-attempts*))
|
||||
(if (zero? remaining-tries)
|
||||
(error 'bind-to-random-port! "Could not find a free UDP port in ~v tries"
|
||||
*total-port-finding-attempts*)
|
||||
(let ((port-number (+ 1024 (random (- 65536 1024)))))
|
||||
(with-handlers [(exn:fail:network?
|
||||
(lambda (e)
|
||||
;; Bind failure. Port in use?
|
||||
(find-a-port (- remaining-tries 1))))]
|
||||
(udp-bind! s #f port-number))))))
|
||||
|
||||
(define (raw-dns-query query [servers '("127.0.0.1")])
|
||||
(let ((s (udp-open-socket #f #f)))
|
||||
(bind-to-random-port! s)
|
||||
;; TODO: randomize ordering of servers in list.
|
||||
(let search ((timeout 3)
|
||||
(remaining-servers servers))
|
||||
(if (null? remaining-servers)
|
||||
(let ((new-timeout (next-timeout timeout)))
|
||||
(if new-timeout
|
||||
(search new-timeout servers)
|
||||
#f))
|
||||
(let ((server (car remaining-servers)))
|
||||
(let ((server-hostname (if (string? server) server (car server)))
|
||||
(server-port (if (string? server) 53 (cadr server))))
|
||||
;;(write `(querying ,server-hostname ,server-port with timeout ,timeout)) (newline)
|
||||
(udp-send-to s server-hostname server-port (dns-message->packet query))
|
||||
(let ((buffer (make-bytes 512))) ;; maximum DNS reply length
|
||||
(let ((result (sync/timeout timeout (udp-receive!-evt s buffer))))
|
||||
;; TODO: maybe receive only specifically from the queried IP address?
|
||||
;;(write `(response ,result)) (newline)
|
||||
(if result
|
||||
(let ((reply-length (car result)))
|
||||
(packet->dns-message (sub-bit-string buffer 0 (* 8 reply-length))))
|
||||
(search timeout (cdr remaining-servers)))))))))))
|
||||
|
|
@ -1,35 +0,0 @@
|
|||
#lang racket/base
|
||||
|
||||
(provide define-mapping)
|
||||
|
||||
(define-syntax check-defaults
|
||||
(syntax-rules ()
|
||||
((_ fn bn fd bd #:forward-default new-fd rest ...)
|
||||
(check-defaults fn bn new-fd bd rest ...))
|
||||
((_ fn bn fd bd #:backward-default new-bd rest ...)
|
||||
(check-defaults fn bn fd new-bd rest ...))
|
||||
((_ fn bn fd bd (lhs rhs) ...)
|
||||
(begin
|
||||
(define (fn l)
|
||||
(case l
|
||||
((lhs) 'rhs) ...
|
||||
(else (fd l))))
|
||||
(define (bn r)
|
||||
(case r
|
||||
((rhs) 'lhs) ...
|
||||
(else (bd r))))))))
|
||||
|
||||
(define (die-with-mapping-name n)
|
||||
(lambda (v)
|
||||
(raise (exn:fail:contract
|
||||
(format "~v: Mapping not found for ~v" n v)
|
||||
(current-continuation-marks)))))
|
||||
|
||||
(define-syntax define-mapping
|
||||
(syntax-rules ()
|
||||
((_ forward-name backward-name rest ...)
|
||||
(check-defaults forward-name
|
||||
backward-name
|
||||
(die-with-mapping-name 'forward-name)
|
||||
(die-with-mapping-name 'backward-name)
|
||||
rest ...))))
|
||||
|
|
@ -1,248 +0,0 @@
|
|||
#lang racket/base
|
||||
|
||||
(require "dns.rkt")
|
||||
|
||||
;; Wed Jun 29 16:33:58 2011 (4e0b8c36): UDP: localhost sent 28 bytes:
|
||||
;; 00000000: 66 3A 01 00 00 01 00 00 : 00 00 00 00 06 67 6F 6F f:...........goo
|
||||
;; 00000010: 67 6C 65 03 63 6F 6D 00 : 00 FF 00 01 gle.com.....
|
||||
;; 0000001C:
|
||||
|
||||
(define (q-google-in-any)
|
||||
(bytes #x66 #x3A #x01 #x00 #x00 #x01 #x00 #x00
|
||||
#x00 #x00 #x00 #x00 #x06 #x67 #x6F #x6F
|
||||
#x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00
|
||||
#x00 #xFF #x00 #x01))
|
||||
|
||||
;; Wed Jun 29 16:33:58 2011 (4e0b8c36): UDP: dslrouter.westell.com sent 494 bytes:
|
||||
;; 00000000: 66 3A 81 80 00 01 00 0F : 00 00 00 07 06 67 6F 6F f:...........goo
|
||||
;; 00000010: 67 6C 65 03 63 6F 6D 00 : 00 FF 00 01 C0 0C 00 10 gle.com.........
|
||||
;; 00000020: 00 01 00 00 0C 2F 00 52 : 51 76 3D 73 70 66 31 20 ...../.RQv=spf1
|
||||
;; 00000030: 69 6E 63 6C 75 64 65 3A : 5F 6E 65 74 62 6C 6F 63 include:_netbloc
|
||||
;; 00000040: 6B 73 2E 67 6F 6F 67 6C : 65 2E 63 6F 6D 20 69 70 ks.google.com ip
|
||||
;; 00000050: 34 3A 32 31 36 2E 37 33 : 2E 39 33 2E 37 30 2F 33 4:216.73.93.70/3
|
||||
;; 00000060: 31 20 69 70 34 3A 32 31 : 36 2E 37 33 2E 39 33 2E 1 ip4:216.73.93.
|
||||
;; 00000070: 37 32 2F 33 31 20 7E 61 : 6C 6C C0 0C 00 01 00 01 72/31 ~all......
|
||||
;; 00000080: 00 00 01 1D 00 04 4A 7D : E2 92 C0 0C 00 01 00 01 ......J}........
|
||||
;; 00000090: 00 00 01 1D 00 04 4A 7D : E2 94 C0 0C 00 01 00 01 ......J}........
|
||||
;; 000000A0: 00 00 01 1D 00 04 4A 7D : E2 91 C0 0C 00 01 00 01 ......J}........
|
||||
;; 000000B0: 00 00 01 1D 00 04 4A 7D : E2 93 C0 0C 00 01 00 01 ......J}........
|
||||
;; 000000C0: 00 00 01 1D 00 04 4A 7D : E2 90 C0 0C 00 02 00 01 ......J}........
|
||||
;; 000000D0: 00 03 A5 1D 00 06 03 6E : 73 32 C0 0C C0 0C 00 02 .......ns2......
|
||||
;; 000000E0: 00 01 00 03 A5 1D 00 06 : 03 6E 73 33 C0 0C C0 0C .........ns3....
|
||||
;; 000000F0: 00 02 00 01 00 03 A5 1D : 00 06 03 6E 73 31 C0 0C ...........ns1..
|
||||
;; 00000100: C0 0C 00 02 00 01 00 03 : A5 1D 00 06 03 6E 73 34 .............ns4
|
||||
;; 00000110: C0 0C C0 0C 00 0F 00 01 : 00 00 00 2A 00 11 00 14 ...........*....
|
||||
;; 00000120: 04 61 6C 74 31 05 61 73 : 70 6D 78 01 6C C0 0C C0 .alt1.aspmx.l...
|
||||
;; 00000130: 0C 00 0F 00 01 00 00 00 : 2A 00 09 00 1E 04 61 6C ........*.....al
|
||||
;; 00000140: 74 32 C1 25 C0 0C 00 0F : 00 01 00 00 00 2A 00 04 t2.%.........*..
|
||||
;; 00000150: 00 0A C1 25 C0 0C 00 0F : 00 01 00 00 00 2A 00 09 ...%.........*..
|
||||
;; 00000160: 00 28 04 61 6C 74 33 C1 : 25 C0 0C 00 0F 00 01 00 .(.alt3.%.......
|
||||
;; 00000170: 00 00 2A 00 09 00 32 04 : 61 6C 74 34 C1 25 C0 E8 ..*...2.alt4.%..
|
||||
;; 00000180: 00 01 00 01 00 03 A2 CF : 00 04 D8 EF 24 0A C0 FA ............$...
|
||||
;; 00000190: 00 01 00 01 00 03 A2 CF : 00 04 D8 EF 20 0A C1 0C ............ ...
|
||||
;; 000001A0: 00 01 00 01 00 03 A2 CF : 00 04 D8 EF 26 0A C0 D6 ............&...
|
||||
;; 000001B0: 00 01 00 01 00 03 A2 CF : 00 04 D8 EF 22 0A C1 3D ............"..=
|
||||
;; 000001C0: 00 01 00 01 00 00 00 F0 : 00 04 4A 7D 27 1B C1 25 ..........J}'..%
|
||||
;; 000001D0: 00 01 00 01 00 00 00 F6 : 00 04 4A 7D 73 1B C1 20 ..........J}s..
|
||||
;; 000001E0: 00 01 00 01 00 00 00 21 : 00 04 4A 7D 4D 1B .......!..J}M.
|
||||
;; 000001EE:
|
||||
|
||||
(define (a-google-in-any)
|
||||
(bytes
|
||||
#x66 #x3A #x81 #x80 #x00 #x01 #x00 #x0F #x00 #x00 #x00 #x07 #x06 #x67 #x6F #x6F
|
||||
#x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #x00 #xFF #x00 #x01 #xC0 #x0C #x00 #x10
|
||||
#x00 #x01 #x00 #x00 #x0C #x2F #x00 #x52 #x51 #x76 #x3D #x73 #x70 #x66 #x31 #x20
|
||||
#x69 #x6E #x63 #x6C #x75 #x64 #x65 #x3A #x5F #x6E #x65 #x74 #x62 #x6C #x6F #x63
|
||||
#x6B #x73 #x2E #x67 #x6F #x6F #x67 #x6C #x65 #x2E #x63 #x6F #x6D #x20 #x69 #x70
|
||||
#x34 #x3A #x32 #x31 #x36 #x2E #x37 #x33 #x2E #x39 #x33 #x2E #x37 #x30 #x2F #x33
|
||||
#x31 #x20 #x69 #x70 #x34 #x3A #x32 #x31 #x36 #x2E #x37 #x33 #x2E #x39 #x33 #x2E
|
||||
#x37 #x32 #x2F #x33 #x31 #x20 #x7E #x61 #x6C #x6C #xC0 #x0C #x00 #x01 #x00 #x01
|
||||
#x00 #x00 #x01 #x1D #x00 #x04 #x4A #x7D #xE2 #x92 #xC0 #x0C #x00 #x01 #x00 #x01
|
||||
#x00 #x00 #x01 #x1D #x00 #x04 #x4A #x7D #xE2 #x94 #xC0 #x0C #x00 #x01 #x00 #x01
|
||||
#x00 #x00 #x01 #x1D #x00 #x04 #x4A #x7D #xE2 #x91 #xC0 #x0C #x00 #x01 #x00 #x01
|
||||
#x00 #x00 #x01 #x1D #x00 #x04 #x4A #x7D #xE2 #x93 #xC0 #x0C #x00 #x01 #x00 #x01
|
||||
#x00 #x00 #x01 #x1D #x00 #x04 #x4A #x7D #xE2 #x90 #xC0 #x0C #x00 #x02 #x00 #x01
|
||||
#x00 #x03 #xA5 #x1D #x00 #x06 #x03 #x6E #x73 #x32 #xC0 #x0C #xC0 #x0C #x00 #x02
|
||||
#x00 #x01 #x00 #x03 #xA5 #x1D #x00 #x06 #x03 #x6E #x73 #x33 #xC0 #x0C #xC0 #x0C
|
||||
#x00 #x02 #x00 #x01 #x00 #x03 #xA5 #x1D #x00 #x06 #x03 #x6E #x73 #x31 #xC0 #x0C
|
||||
#xC0 #x0C #x00 #x02 #x00 #x01 #x00 #x03 #xA5 #x1D #x00 #x06 #x03 #x6E #x73 #x34
|
||||
#xC0 #x0C #xC0 #x0C #x00 #x0F #x00 #x01 #x00 #x00 #x00 #x2A #x00 #x11 #x00 #x14
|
||||
#x04 #x61 #x6C #x74 #x31 #x05 #x61 #x73 #x70 #x6D #x78 #x01 #x6C #xC0 #x0C #xC0
|
||||
#x0C #x00 #x0F #x00 #x01 #x00 #x00 #x00 #x2A #x00 #x09 #x00 #x1E #x04 #x61 #x6C
|
||||
#x74 #x32 #xC1 #x25 #xC0 #x0C #x00 #x0F #x00 #x01 #x00 #x00 #x00 #x2A #x00 #x04
|
||||
#x00 #x0A #xC1 #x25 #xC0 #x0C #x00 #x0F #x00 #x01 #x00 #x00 #x00 #x2A #x00 #x09
|
||||
#x00 #x28 #x04 #x61 #x6C #x74 #x33 #xC1 #x25 #xC0 #x0C #x00 #x0F #x00 #x01 #x00
|
||||
#x00 #x00 #x2A #x00 #x09 #x00 #x32 #x04 #x61 #x6C #x74 #x34 #xC1 #x25 #xC0 #xE8
|
||||
#x00 #x01 #x00 #x01 #x00 #x03 #xA2 #xCF #x00 #x04 #xD8 #xEF #x24 #x0A #xC0 #xFA
|
||||
#x00 #x01 #x00 #x01 #x00 #x03 #xA2 #xCF #x00 #x04 #xD8 #xEF #x20 #x0A #xC1 #x0C
|
||||
#x00 #x01 #x00 #x01 #x00 #x03 #xA2 #xCF #x00 #x04 #xD8 #xEF #x26 #x0A #xC0 #xD6
|
||||
#x00 #x01 #x00 #x01 #x00 #x03 #xA2 #xCF #x00 #x04 #xD8 #xEF #x22 #x0A #xC1 #x3D
|
||||
#x00 #x01 #x00 #x01 #x00 #x00 #x00 #xF0 #x00 #x04 #x4A #x7D #x27 #x1B #xC1 #x25
|
||||
#x00 #x01 #x00 #x01 #x00 #x00 #x00 #xF6 #x00 #x04 #x4A #x7D #x73 #x1B #xC1 #x20
|
||||
#x00 #x01 #x00 #x01 #x00 #x00 #x00 #x21 #x00 #x04 #x4A #x7D #x4D #x1B))
|
||||
|
||||
(require racket/pretty)
|
||||
(pretty-print (packet->dns-message (q-google-in-any)))
|
||||
(pretty-print (packet->dns-message (a-google-in-any)))
|
||||
|
||||
(pretty-print (dns-message->packet (packet->dns-message (a-google-in-any))))
|
||||
|
||||
;; Wed Jun 29 20:59:17 2011 (4e0bca65): UDP: localhost sent 28 bytes:
|
||||
;; 00000000: 47 16 01 00 00 01 00 00 : 00 00 00 00 06 67 6F 6F G............goo
|
||||
;; 00000010: 67 6C 65 03 63 6F 6D 00 : 00 1C 00 01 gle.com.....
|
||||
;; 0000001C:
|
||||
;; Wed Jun 29 20:59:17 2011 (4e0bca65): UDP: pass through succeeded
|
||||
;; Wed Jun 29 20:59:17 2011 (4e0bca65): UDP: google-public-dns-a.google.com sent 78 bytes:
|
||||
;; 00000000: 47 16 81 80 00 01 00 00 : 00 01 00 00 06 67 6F 6F G............goo
|
||||
;; 00000010: 67 6C 65 03 63 6F 6D 00 : 00 1C 00 01 C0 0C 00 06 gle.com.........
|
||||
;; 00000020: 00 01 00 00 02 52 00 26 : 03 6E 73 31 C0 0C 09 64 .....R.&.ns1...d
|
||||
;; 00000030: 6E 73 2D 61 64 6D 69 6E : C0 0C 00 16 33 23 00 00 ns-admin....3#..
|
||||
;; 00000040: 1C 20 00 00 07 08 00 12 : 75 00 00 00 01 2C . ......u....,
|
||||
;; 0000004E:
|
||||
|
||||
(pretty-print
|
||||
(packet->dns-message
|
||||
(bytes
|
||||
#x47 #x16 #x01 #x00 #x00 #x01 #x00 #x00 #x00 #x00 #x00 #x00 #x06 #x67 #x6F #x6F
|
||||
#x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #x00 #x1C #x00 #x01)))
|
||||
|
||||
(pretty-print
|
||||
(packet->dns-message
|
||||
(bytes
|
||||
#x47 #x16 #x81 #x80 #x00 #x01 #x00 #x00 #x00 #x01 #x00 #x00 #x06 #x67 #x6F #x6F
|
||||
#x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #x00 #x1C #x00 #x01 #xC0 #x0C #x00 #x06
|
||||
#x00 #x01 #x00 #x00 #x02 #x52 #x00 #x26 #x03 #x6E #x73 #x31 #xC0 #x0C #x09 #x64
|
||||
#x6E #x73 #x2D #x61 #x64 #x6D #x69 #x6E #xC0 #x0C #x00 #x16 #x33 #x23 #x00 #x00
|
||||
#x1C #x20 #x00 #x00 #x07 #x08 #x00 #x12 #x75 #x00 #x00 #x00 #x01 #x2C)))
|
||||
|
||||
;; Wed Jun 29 21:05:03 2011 (4e0bcbbf): UDP: localhost sent 32 bytes:
|
||||
;; 00000000: 12 70 01 00 00 01 00 00 : 00 00 00 00 03 77 77 77 .p...........www
|
||||
;; 00000010: 06 67 6F 6F 67 6C 65 03 : 63 6F 6D 00 00 1C 00 01 .google.com.....
|
||||
;; 00000020:
|
||||
;; Wed Jun 29 21:05:03 2011 (4e0bcbbf): UDP: pass through succeeded
|
||||
;; Wed Jun 29 21:05:03 2011 (4e0bcbbf): UDP: ns1.google.com sent 52 bytes:
|
||||
;; 00000000: 12 70 85 00 00 01 00 01 : 00 00 00 00 03 77 77 77 .p...........www
|
||||
;; 00000010: 06 67 6F 6F 67 6C 65 03 : 63 6F 6D 00 00 1C 00 01 .google.com.....
|
||||
;; 00000020: C0 0C 00 05 00 01 00 09 : 3A 80 00 08 03 77 77 77 ........:....www
|
||||
;; 00000030: 01 6C C0 10 : .l..
|
||||
;; 00000034:
|
||||
|
||||
(pretty-print
|
||||
(packet->dns-message
|
||||
(bytes
|
||||
#x12 #x70 #x01 #x00 #x00 #x01 #x00 #x00 #x00 #x00 #x00 #x00 #x03 #x77 #x77 #x77
|
||||
#x06 #x67 #x6F #x6F #x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #x00 #x1C #x00 #x01)))
|
||||
|
||||
(pretty-print
|
||||
(packet->dns-message
|
||||
(bytes
|
||||
#x12 #x70 #x85 #x00 #x00 #x01 #x00 #x01 #x00 #x00 #x00 #x00 #x03 #x77 #x77 #x77
|
||||
#x06 #x67 #x6F #x6F #x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #x00 #x1C #x00 #x01
|
||||
#xC0 #x0C #x00 #x05 #x00 #x01 #x00 #x09 #x3A #x80 #x00 #x08 #x03 #x77 #x77 #x77
|
||||
#x01 #x6C #xC0 #x10)))
|
||||
|
||||
;; Wed Jun 29 21:07:46 2011 (4e0bcc62): UDP: ns1.google.com sent 82 bytes:
|
||||
;; 00000000: 23 79 85 00 00 01 00 02 : 00 00 00 00 04 69 70 76 #y...........ipv
|
||||
;; 00000010: 36 06 67 6F 6F 67 6C 65 : 03 63 6F 6D 00 00 1C 00 6.google.com....
|
||||
;; 00000020: 01 C0 0C 00 05 00 01 00 : 09 3A 80 00 09 04 69 70 .........:....ip
|
||||
;; 00000030: 76 36 01 6C C0 11 C0 2D : 00 1C 00 01 00 00 01 2C v6.l...-.......,
|
||||
;; 00000040: 00 10 20 01 48 60 80 0F : 00 00 00 00 00 00 00 00 .. .H`..........
|
||||
;; 00000050: 00 68 : .h
|
||||
;; 00000052:
|
||||
|
||||
(pretty-print
|
||||
(packet->dns-message
|
||||
(bytes
|
||||
#x23 #x79 #x85 #x00 #x00 #x01 #x00 #x02 #x00 #x00 #x00 #x00 #x04 #x69 #x70 #x76
|
||||
#x36 #x06 #x67 #x6F #x6F #x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #x00 #x1C #x00
|
||||
#x01 #xC0 #x0C #x00 #x05 #x00 #x01 #x00 #x09 #x3A #x80 #x00 #x09 #x04 #x69 #x70
|
||||
#x76 #x36 #x01 #x6C #xC0 #x11 #xC0 #x2D #x00 #x1C #x00 #x01 #x00 #x00 #x01 #x2C
|
||||
#x00 #x10 #x20 #x01 #x48 #x60 #x80 #x0F #x00 #x00 #x00 #x00 #x00 #x00 #x00 #x00
|
||||
#x00 #x68)))
|
||||
|
||||
(pretty-print
|
||||
(dns-message->packet
|
||||
(packet->dns-message
|
||||
(bytes
|
||||
#x23 #x79 #x85 #x00 #x00 #x01 #x00 #x02 #x00 #x00 #x00 #x00 #x04 #x69 #x70 #x76
|
||||
#x36 #x06 #x67 #x6F #x6F #x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #x00 #x1C #x00
|
||||
#x01 #xC0 #x0C #x00 #x05 #x00 #x01 #x00 #x09 #x3A #x80 #x00 #x09 #x04 #x69 #x70
|
||||
#x76 #x36 #x01 #x6C #xC0 #x11 #xC0 #x2D #x00 #x1C #x00 #x01 #x00 #x00 #x01 #x2C
|
||||
#x00 #x10 #x20 #x01 #x48 #x60 #x80 #x0F #x00 #x00 #x00 #x00 #x00 #x00 #x00 #x00
|
||||
#x00 #x68))))
|
||||
|
||||
;; Thu Jun 30 15:12:45 2011 (4e0ccaad): UDP: asgard.ccs.neu.edu sent 486 bytes:
|
||||
;; 00000000: 13 CA 81 80 00 01 00 05 : 00 04 00 09 0C 5F 78 6D ............._xm
|
||||
;; 00000010: 70 70 2D 73 65 72 76 65 : 72 04 5F 74 63 70 06 67 pp-server._tcp.g
|
||||
;; 00000020: 6F 6F 67 6C 65 03 63 6F : 6D 00 00 21 00 01 C0 0C oogle.com..!....
|
||||
;; 00000030: 00 21 00 01 00 00 03 72 : 00 21 00 14 00 00 14 95 .!.....r.!......
|
||||
;; 00000040: 0C 78 6D 70 70 2D 73 65 : 72 76 65 72 34 01 6C 06 .xmpp-server4.l.
|
||||
;; 00000050: 67 6F 6F 67 6C 65 03 63 : 6F 6D 00 C0 0C 00 21 00 google.com....!.
|
||||
;; 00000060: 01 00 00 03 72 00 20 00 : 05 00 00 14 95 0B 78 6D ....r. .......xm
|
||||
;; 00000070: 70 70 2D 73 65 72 76 65 : 72 01 6C 06 67 6F 6F 67 pp-server.l.goog
|
||||
;; 00000080: 6C 65 03 63 6F 6D 00 C0 : 0C 00 21 00 01 00 00 03 le.com....!.....
|
||||
;; 00000090: 72 00 21 00 14 00 00 14 : 95 0C 78 6D 70 70 2D 73 r.!.......xmpp-s
|
||||
;; 000000A0: 65 72 76 65 72 31 01 6C : 06 67 6F 6F 67 6C 65 03 erver1.l.google.
|
||||
;; 000000B0: 63 6F 6D 00 C0 0C 00 21 : 00 01 00 00 03 72 00 21 com....!.....r.!
|
||||
;; 000000C0: 00 14 00 00 14 95 0C 78 : 6D 70 70 2D 73 65 72 76 .......xmpp-serv
|
||||
;; 000000D0: 65 72 32 01 6C 06 67 6F : 6F 67 6C 65 03 63 6F 6D er2.l.google.com
|
||||
;; 000000E0: 00 C0 0C 00 21 00 01 00 : 00 03 72 00 21 00 14 00 ....!.....r.!...
|
||||
;; 000000F0: 00 14 95 0C 78 6D 70 70 : 2D 73 65 72 76 65 72 33 ....xmpp-server3
|
||||
;; 00000100: 01 6C 06 67 6F 6F 67 6C : 65 03 63 6F 6D 00 C1 02 .l.google.com...
|
||||
;; 00000110: 00 02 00 01 00 01 54 24 : 00 06 03 6E 73 33 C1 02 ......T$...ns3..
|
||||
;; 00000120: C1 02 00 02 00 01 00 01 : 54 24 00 06 03 6E 73 34 ........T$...ns4
|
||||
;; 00000130: C1 02 C1 02 00 02 00 01 : 00 01 54 24 00 06 03 6E ..........T$...n
|
||||
;; 00000140: 73 32 C1 02 C1 02 00 02 : 00 01 00 01 54 24 00 06 s2..........T$..
|
||||
;; 00000150: 03 6E 73 31 C1 02 C0 6D : 00 01 00 01 00 00 01 1A .ns1...m........
|
||||
;; 00000160: 00 04 4A 7D 99 7D C0 99 : 00 01 00 01 00 00 06 F6 ..J}.}..........
|
||||
;; 00000170: 00 04 4A 7D 35 7D C0 C6 : 00 01 00 01 00 00 06 F6 ..J}5}..........
|
||||
;; 00000180: 00 04 4A 7D 2F 7D C0 F3 : 00 01 00 01 00 00 06 F6 ..J}/}..........
|
||||
;; 00000190: 00 04 4A 7D 2D 7D C0 40 : 00 01 00 01 00 00 06 F6 ..J}-}.@........
|
||||
;; 000001A0: 00 04 4A 7D 2D 7D C1 50 : 00 01 00 01 00 00 0A B1 ..J}-}.P........
|
||||
;; 000001B0: 00 04 D8 EF 20 0A C1 3E : 00 01 00 01 00 00 0A B1 .... ..>........
|
||||
;; 000001C0: 00 04 D8 EF 22 0A C1 1A : 00 01 00 01 00 00 0A B1 ...."...........
|
||||
;; 000001D0: 00 04 D8 EF 24 0A C1 2C : 00 01 00 01 00 00 0A B1 ....$..,........
|
||||
;; 000001E0: 00 04 D8 EF 26 0A : ....&.
|
||||
;; 000001E6:
|
||||
|
||||
;; ANSWER SECTION:
|
||||
;;_xmpp-server._tcp.google.com. 900 IN SRV 5 0 5269 xmpp-server.l.google.com.
|
||||
;;_xmpp-server._tcp.google.com. 900 IN SRV 20 0 5269 xmpp-server1.l.google.com.
|
||||
;;_xmpp-server._tcp.google.com. 900 IN SRV 20 0 5269 xmpp-server2.l.google.com.
|
||||
;;_xmpp-server._tcp.google.com. 900 IN SRV 20 0 5269 xmpp-server3.l.google.com.
|
||||
;;_xmpp-server._tcp.google.com. 900 IN SRV 20 0 5269 xmpp-server4.l.google.com.
|
||||
|
||||
(pretty-print
|
||||
(packet->dns-message
|
||||
(bytes
|
||||
#x13 #xCA #x81 #x80 #x00 #x01 #x00 #x05 #x00 #x04 #x00 #x09 #x0C #x5F #x78 #x6D
|
||||
#x70 #x70 #x2D #x73 #x65 #x72 #x76 #x65 #x72 #x04 #x5F #x74 #x63 #x70 #x06 #x67
|
||||
#x6F #x6F #x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #x00 #x21 #x00 #x01 #xC0 #x0C
|
||||
#x00 #x21 #x00 #x01 #x00 #x00 #x03 #x72 #x00 #x21 #x00 #x14 #x00 #x00 #x14 #x95
|
||||
#x0C #x78 #x6D #x70 #x70 #x2D #x73 #x65 #x72 #x76 #x65 #x72 #x34 #x01 #x6C #x06
|
||||
#x67 #x6F #x6F #x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #xC0 #x0C #x00 #x21 #x00
|
||||
#x01 #x00 #x00 #x03 #x72 #x00 #x20 #x00 #x05 #x00 #x00 #x14 #x95 #x0B #x78 #x6D
|
||||
#x70 #x70 #x2D #x73 #x65 #x72 #x76 #x65 #x72 #x01 #x6C #x06 #x67 #x6F #x6F #x67
|
||||
#x6C #x65 #x03 #x63 #x6F #x6D #x00 #xC0 #x0C #x00 #x21 #x00 #x01 #x00 #x00 #x03
|
||||
#x72 #x00 #x21 #x00 #x14 #x00 #x00 #x14 #x95 #x0C #x78 #x6D #x70 #x70 #x2D #x73
|
||||
#x65 #x72 #x76 #x65 #x72 #x31 #x01 #x6C #x06 #x67 #x6F #x6F #x67 #x6C #x65 #x03
|
||||
#x63 #x6F #x6D #x00 #xC0 #x0C #x00 #x21 #x00 #x01 #x00 #x00 #x03 #x72 #x00 #x21
|
||||
#x00 #x14 #x00 #x00 #x14 #x95 #x0C #x78 #x6D #x70 #x70 #x2D #x73 #x65 #x72 #x76
|
||||
#x65 #x72 #x32 #x01 #x6C #x06 #x67 #x6F #x6F #x67 #x6C #x65 #x03 #x63 #x6F #x6D
|
||||
#x00 #xC0 #x0C #x00 #x21 #x00 #x01 #x00 #x00 #x03 #x72 #x00 #x21 #x00 #x14 #x00
|
||||
#x00 #x14 #x95 #x0C #x78 #x6D #x70 #x70 #x2D #x73 #x65 #x72 #x76 #x65 #x72 #x33
|
||||
#x01 #x6C #x06 #x67 #x6F #x6F #x67 #x6C #x65 #x03 #x63 #x6F #x6D #x00 #xC1 #x02
|
||||
#x00 #x02 #x00 #x01 #x00 #x01 #x54 #x24 #x00 #x06 #x03 #x6E #x73 #x33 #xC1 #x02
|
||||
#xC1 #x02 #x00 #x02 #x00 #x01 #x00 #x01 #x54 #x24 #x00 #x06 #x03 #x6E #x73 #x34
|
||||
#xC1 #x02 #xC1 #x02 #x00 #x02 #x00 #x01 #x00 #x01 #x54 #x24 #x00 #x06 #x03 #x6E
|
||||
#x73 #x32 #xC1 #x02 #xC1 #x02 #x00 #x02 #x00 #x01 #x00 #x01 #x54 #x24 #x00 #x06
|
||||
#x03 #x6E #x73 #x31 #xC1 #x02 #xC0 #x6D #x00 #x01 #x00 #x01 #x00 #x00 #x01 #x1A
|
||||
#x00 #x04 #x4A #x7D #x99 #x7D #xC0 #x99 #x00 #x01 #x00 #x01 #x00 #x00 #x06 #xF6
|
||||
#x00 #x04 #x4A #x7D #x35 #x7D #xC0 #xC6 #x00 #x01 #x00 #x01 #x00 #x00 #x06 #xF6
|
||||
#x00 #x04 #x4A #x7D #x2F #x7D #xC0 #xF3 #x00 #x01 #x00 #x01 #x00 #x00 #x06 #xF6
|
||||
#x00 #x04 #x4A #x7D #x2D #x7D #xC0 #x40 #x00 #x01 #x00 #x01 #x00 #x00 #x06 #xF6
|
||||
#x00 #x04 #x4A #x7D #x2D #x7D #xC1 #x50 #x00 #x01 #x00 #x01 #x00 #x00 #x0A #xB1
|
||||
#x00 #x04 #xD8 #xEF #x20 #x0A #xC1 #x3E #x00 #x01 #x00 #x01 #x00 #x00 #x0A #xB1
|
||||
#x00 #x04 #xD8 #xEF #x22 #x0A #xC1 #x1A #x00 #x01 #x00 #x01 #x00 #x00 #x0A #xB1
|
||||
#x00 #x04 #xD8 #xEF #x24 #x0A #xC1 #x2C #x00 #x01 #x00 #x01 #x00 #x00 #x0A #xB1
|
||||
#x00 #x04 #xD8 #xEF #x26 #x0A)))
|
||||
|
|
@ -1,25 +0,0 @@
|
|||
#lang racket/base
|
||||
|
||||
(require "mapping.rkt")
|
||||
(require rackunit)
|
||||
|
||||
(define-mapping a->b b->a
|
||||
(a b))
|
||||
|
||||
(check-equal? (a->b 'a) 'b)
|
||||
(check-equal? (b->a 'b) 'a)
|
||||
(check-exn exn:fail:contract? (lambda () (a->b 123)))
|
||||
(check-exn exn:fail:contract? (lambda () (a->b 'b)))
|
||||
(check-exn exn:fail:contract? (lambda () (b->a 123)))
|
||||
(check-exn exn:fail:contract? (lambda () (b->a 'a)))
|
||||
|
||||
(define-mapping c->d d->c
|
||||
#:forward-default (lambda (x) 'default-d)
|
||||
#:backward-default (lambda (x) 'default-c)
|
||||
(c 123)
|
||||
(e 234))
|
||||
|
||||
(check-equal? (c->d 'c) 123)
|
||||
(check-equal? (d->c 234) 'e)
|
||||
(check-equal? (c->d 'other) 'default-d)
|
||||
(check-equal? (d->c '235) 'default-c)
|
||||
|
|
@ -1,97 +0,0 @@
|
|||
#lang racket/base
|
||||
|
||||
;; Simple imperative UDP server harness.
|
||||
|
||||
(require racket/match)
|
||||
(require racket/udp)
|
||||
(require (only-in srfi/1 append-reverse))
|
||||
(require racket-typed-matrix/support/dump-bytes)
|
||||
|
||||
(provide (struct-out udp-packet)
|
||||
message-handlers
|
||||
start-udp-service)
|
||||
|
||||
;; A UdpPacket is a (udp-packet Bytes String Uint16), and represents
|
||||
;; either a received UDP packet and the source of the packet, or a UDP
|
||||
;; packet ready to be sent along with the address to which it should
|
||||
;; be sent.
|
||||
(struct udp-packet (body host port) #:prefab)
|
||||
|
||||
;; TODO: Should packet->message be permitted to examine (or possibly
|
||||
;; even transform!) the ServerState?
|
||||
|
||||
;; A Handler is a Message ServerState -> ListOf<Message> ServerState.
|
||||
|
||||
(define-syntax message-handlers
|
||||
(syntax-rules ()
|
||||
((_ old-state-var (pattern body ...) ...)
|
||||
(list (cons (match-lambda (pattern #t) (_ #f))
|
||||
(lambda (v old-state-var)
|
||||
(match v
|
||||
(pattern body ...))))
|
||||
...))))
|
||||
|
||||
;; Starts a generic request/reply UDP server on the given port.
|
||||
(define (start-udp-service
|
||||
port-number ;; Uint16
|
||||
packet->message ;; UdpPacket -> Message
|
||||
;;--------------------------------------------------
|
||||
outbound-message? ;; Message -> Boolean
|
||||
message->packet ;; Message -> UdpPacket
|
||||
;;--------------------------------------------------
|
||||
message-handlers ;; ListOf<Pair<Message -> Boolean, Handler>>
|
||||
default-handler ;; Handler
|
||||
initial-state ;; ServerState
|
||||
#:packet-size-limit
|
||||
[packet-size-limit 65536])
|
||||
(define s (udp-open-socket #f #f)) ;; the server socket
|
||||
(udp-bind! s #f port-number) ;; bind it to the port we were given
|
||||
|
||||
(set! message-handlers ;; TEMPORARY while I figure out I/O
|
||||
(cons (cons outbound-message?
|
||||
(lambda (message state)
|
||||
(define p (message->packet message))
|
||||
(match-define (udp-packet body host port) p)
|
||||
(printf "<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<~n~v~n" body)
|
||||
(dump-bytes! body (bytes-length body))
|
||||
(flush-output)
|
||||
(udp-send-to s host port body)
|
||||
(values '() state)))
|
||||
message-handlers))
|
||||
|
||||
(define (dispatch-messages messages next-messages-rev old-state)
|
||||
(if (null? messages)
|
||||
(check-for-io (reverse next-messages-rev) old-state)
|
||||
(let ((message (car messages)))
|
||||
(define-values (new-messages new-state)
|
||||
(let search ((handlers message-handlers))
|
||||
(cond
|
||||
[(null? handlers) (default-handler message old-state)]
|
||||
[((caar handlers) message) ((cdar handlers) message old-state)]
|
||||
[else (search (cdr handlers))])))
|
||||
(dispatch-messages (cdr messages)
|
||||
(append-reverse new-messages next-messages-rev)
|
||||
new-state))))
|
||||
|
||||
(define (check-for-io pending-messages old-state)
|
||||
(define buffer (make-bytes packet-size-limit))
|
||||
(define new-messages
|
||||
(sync (handle-evt (udp-receive!-evt s buffer)
|
||||
(match-lambda
|
||||
[(list packet-length source-hostname source-port)
|
||||
(define packet (subbytes buffer 0 packet-length))
|
||||
(printf ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>~n~v~n" packet)
|
||||
(dump-bytes! buffer packet-length)
|
||||
(flush-output)
|
||||
|
||||
(define packet-and-source
|
||||
(udp-packet packet source-hostname source-port))
|
||||
(define message (packet->message packet-and-source))
|
||||
(list message)]))
|
||||
(if (null? pending-messages)
|
||||
never-evt ;; Nothing waiting to be done, don't wake up until sth external arrives
|
||||
(handle-evt (system-idle-evt)
|
||||
(lambda (dummy) '())))))
|
||||
(dispatch-messages (append new-messages pending-messages) '() old-state))
|
||||
|
||||
(check-for-io '() initial-state))
|
||||
|
|
@ -1,156 +0,0 @@
|
|||
#lang racket/base
|
||||
|
||||
;; DNS server using simple-udp-service.rkt.
|
||||
|
||||
(require racket/unit)
|
||||
(require racket/match)
|
||||
(require racket/set)
|
||||
(require racket/bool)
|
||||
(require racket-bitsyntax)
|
||||
(require "api.rkt")
|
||||
(require "codec.rkt")
|
||||
(require "zonedb.rkt")
|
||||
(require "resolver.rkt")
|
||||
(require "simple-udp-service.rkt")
|
||||
|
||||
;; Instantiated with a SOA record for the zone it is serving as well
|
||||
;; as a zone's worth of DNS data which is used to answer queries
|
||||
;; authoritatively. Never caches information, never performs recursive
|
||||
;; queries.
|
||||
|
||||
;; Rules:
|
||||
|
||||
;; - Answers authoritative NXDOMAIN answers for queries falling within
|
||||
;; its zone. (This is the only responder entitled to answer NXDOMAIN!)
|
||||
;; - Answers with referrals for queries falling in subzones. It
|
||||
;; determines subzones based on the RRs it is configured with at
|
||||
;; startup.
|
||||
|
||||
(struct bad-dns-packet (detail host port reason) #:prefab)
|
||||
(struct dns-request (message host port) #:prefab)
|
||||
(struct dns-reply (message host port) #:prefab)
|
||||
|
||||
;; start-server : UInt16 RR ListOf<RR> -> Void
|
||||
;; Starts a server that will answer questions received on the given
|
||||
;; UDP port based on the RRs it is given and the zone origin specified
|
||||
;; in the soa-rr given.
|
||||
(require racket/pretty)
|
||||
(define (start-server port-number soa-rr rrs)
|
||||
;; Compile the zone hash table
|
||||
(define zone (compile-zone-db (cons soa-rr rrs)))
|
||||
(pretty-print zone)
|
||||
|
||||
(start-udp-service
|
||||
port-number
|
||||
udp-packet->dns-message
|
||||
dns-reply?
|
||||
dns-reply->udp-packet
|
||||
(message-handlers old-state
|
||||
[(? bad-dns-packet? p)
|
||||
(pretty-print p)
|
||||
(values '() old-state)]
|
||||
[(? dns-request? r)
|
||||
(values (handle-request soa-rr zone r) old-state)])
|
||||
(lambda (unhandled state)
|
||||
(error 'dns-server "Unhandled packet ~v" unhandled))
|
||||
#f
|
||||
#:packet-size-limit 512))
|
||||
|
||||
(define (udp-packet->dns-message packet)
|
||||
(match-define (udp-packet body host port) packet)
|
||||
(with-handlers ((exn:fail? (lambda (e) (bad-dns-packet body host port 'unparseable))))
|
||||
(define message (packet->dns-message body))
|
||||
(case (dns-message-direction message)
|
||||
((request) (dns-request message host port))
|
||||
((response) (bad-dns-packet message host port 'unexpected-dns-response)))))
|
||||
|
||||
;; TODO: dns-reply->udp-packet may fail! The server may supply some
|
||||
;; value that isn't a proper DNSMessage. In that case we might like to
|
||||
;; not send a UDP packet, but instead send out a bad-dns-packet local
|
||||
;; message for logging etc. (Glossing over the issue of identifying
|
||||
;; the direction of the message for now.)
|
||||
;;
|
||||
;; Once we move to pluggable external-event-sources/relays this will
|
||||
;; go away: they'll be handlers like anything else, that just happen
|
||||
;; to have a side effect in some containing (or if not containing, at
|
||||
;; least *in-scope*) network.
|
||||
|
||||
(define (dns-reply->udp-packet r)
|
||||
(match-define (dns-reply message host port) r)
|
||||
(udp-packet (dns-message->packet message) host port))
|
||||
|
||||
(define (first-only xs)
|
||||
(if (null? xs)
|
||||
xs
|
||||
(cons (car xs) '())))
|
||||
|
||||
(define (handle-request soa-rr zone request)
|
||||
(match-define (dns-request request-message request-host request-port) request)
|
||||
|
||||
(define (make-reply name send-name-error? answers authorities additional)
|
||||
(dns-message (dns-message-id request-message)
|
||||
'response
|
||||
'query
|
||||
(if (in-bailiwick? name (rr-name soa-rr)) 'authoritative 'non-authoritative)
|
||||
'not-truncated
|
||||
(dns-message-recursion-desired request-message)
|
||||
'no-recursion-available
|
||||
(if send-name-error? 'name-error 'no-error)
|
||||
(dns-message-questions request-message)
|
||||
(rr-set->list answers)
|
||||
(rr-set->list authorities)
|
||||
(rr-set->list additional)))
|
||||
|
||||
(define (answer-question q make-reply)
|
||||
;; Notice that we claim to be authoritative for our configured
|
||||
;; zone. If we ever answer name-error, that means there are no RRs
|
||||
;; *at all* for the queried name. If there are RRs for the queried
|
||||
;; name, but they happen not to be the ones asked for, name-error
|
||||
;; must *not* be returned: instead, a normal no-error reply is
|
||||
;; sent with an empty answer section.
|
||||
;;
|
||||
;; If we wanted to support caching of negative replies, we'd
|
||||
;; follow the guidelines in section 4.3.4 "Negative response
|
||||
;; caching" of RFC1034, adding our zone SOA with an appropriate
|
||||
;; TTL to the additional section of the reply.
|
||||
;;
|
||||
;; TODO: We support returning out-of-bailiwick records (glue)
|
||||
;; here. Reexamine the rules for doing so.
|
||||
(match-define (question qname qtype qclass #f) q)
|
||||
|
||||
(define (expand-cnames worklist ans)
|
||||
(match worklist
|
||||
['()
|
||||
(match-define (complete-answer ns us ds) ans)
|
||||
(make-reply qname #f ns us ds)]
|
||||
[(cons next-cname rest)
|
||||
(define a (resolve-from-zone (question next-cname qtype qclass q) zone soa-rr (set)))
|
||||
(incorporate-answer a rest ans)]))
|
||||
|
||||
(define (incorporate-answer this-answer worklist ans)
|
||||
(match this-answer
|
||||
[(partial-answer new-info more-cnames)
|
||||
(expand-cnames (append worklist more-cnames)
|
||||
(merge-answers new-info ans))]
|
||||
[(? complete-answer?)
|
||||
(expand-cnames worklist
|
||||
(merge-answers this-answer ans))]
|
||||
[_ ;; #f or a referral
|
||||
(expand-cnames worklist ans)]))
|
||||
|
||||
(match (resolve-from-zone q zone soa-rr (set))
|
||||
[#f ;; Signal name-error/NXDOMAIN
|
||||
(make-reply qname #t (set) (set) (set))]
|
||||
[(referral _ ns-rrs additional)
|
||||
(make-reply qname #f ns-rrs (set soa-rr) additional)]
|
||||
[this-answer
|
||||
(incorporate-answer this-answer '() (empty-complete-answer))]))
|
||||
|
||||
;; TODO: check opcode and direction in request
|
||||
;; TODO: think again about multiple questions in one packet
|
||||
(map (lambda (q)
|
||||
(dns-reply (answer-question q make-reply) request-host request-port))
|
||||
(first-only (dns-message-questions request-message))))
|
||||
|
||||
(require "test-rrs.rkt")
|
||||
(start-server (test-port-number) test-soa-rr test-rrs)
|
||||
75
stress.rkt
75
stress.rkt
|
|
@ -1,75 +0,0 @@
|
|||
#lang racket/base
|
||||
|
||||
;; Simple stress-tester and performance measurement tool for DNS
|
||||
;; implementations.
|
||||
|
||||
(require racket/udp)
|
||||
(require racket/set)
|
||||
(require racket-bitsyntax)
|
||||
(require "api.rkt")
|
||||
(require "codec.rkt")
|
||||
(require "test-rrs.rkt")
|
||||
|
||||
(require racket/pretty)
|
||||
|
||||
(define latencies (make-vector 200 0))
|
||||
(define latency-pos 0)
|
||||
(define (record-latency-ms! ms)
|
||||
(vector-set! latencies latency-pos ms)
|
||||
(set! latency-pos (modulo (+ latency-pos 1) (vector-length latencies)))
|
||||
(when (zero? latency-pos)
|
||||
(for-each display (list ";; Mean latency "(/ (for/fold
|
||||
((sum 0))
|
||||
((i latencies))
|
||||
(+ sum i))
|
||||
(vector-length latencies))"ms\n"))))
|
||||
|
||||
(define (stress hostname port-number count rate)
|
||||
(define s (udp-open-socket #f #f))
|
||||
|
||||
(define start-time (current-inexact-milliseconds))
|
||||
(let loop ((remaining count))
|
||||
(define request-message (dns-message (random 65536)
|
||||
'request
|
||||
'query
|
||||
'non-authoritative
|
||||
'not-truncated
|
||||
'recursion-desired
|
||||
'no-recursion-available
|
||||
'no-error
|
||||
(list (question (domain '(#"www" #"google" #"com"))
|
||||
'a
|
||||
'in
|
||||
#f))
|
||||
'()
|
||||
'()
|
||||
'()))
|
||||
|
||||
(define now (current-inexact-milliseconds))
|
||||
(define sent-count (- count remaining))
|
||||
(define delta-ms (- now start-time))
|
||||
(define current-rate (/ sent-count (/ delta-ms 1000.0)))
|
||||
|
||||
(when (> current-rate rate)
|
||||
(define target-delta-sec (/ sent-count rate))
|
||||
(sleep (- target-delta-sec (/ delta-ms 1000))))
|
||||
|
||||
(when (zero? (modulo sent-count rate))
|
||||
(for-each display (list ";; Sent "sent-count" at target "rate"Hz, actual "
|
||||
current-rate"Hz, in "delta-ms"ms\n")))
|
||||
|
||||
(when (positive? remaining)
|
||||
(define sent-time (current-inexact-milliseconds))
|
||||
(udp-send-to s hostname port-number (dns-message->packet request-message))
|
||||
|
||||
(define buffer (make-bytes 512))
|
||||
(define-values (packet-length source-hostname source-port)
|
||||
(udp-receive! s buffer))
|
||||
(define received-time (current-inexact-milliseconds))
|
||||
(define reply (packet->dns-message (sub-bit-string buffer 0 (* 8 packet-length))))
|
||||
|
||||
;;(pretty-print reply)
|
||||
(record-latency-ms! (- received-time sent-time))
|
||||
(loop (- remaining 1)))))
|
||||
|
||||
(stress "localhost" (test-port-number) 100000 500)
|
||||
Loading…
Reference in New Issue