Compare commits
No commits in common. "syndicate" and "typed" have entirely different histories.
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@ -2,7 +2,7 @@
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This is a [Racket](http://racket-lang.org/) implementation of a DNS
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server and iterative resolver. It's written to work with
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[Syndicate](https://github.com/tonyg/syndicate), but could readily
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[Marketplace](https://github.com/tonyg/marketplace), but could readily
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be adapted to work with other I/O substrates. (It originally used
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Racket's `sync` and events directly.)
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@ -18,9 +18,9 @@ equal to Racket 6.0 should work. Racket releases can be downloaded
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Once you have Racket installed,
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raco pkg install syndicate bitsyntax
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raco pkg install marketplace bitsyntax
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to install Syndicate and
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to install Marketplace (note: will take a long time) and
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[bitsyntax](https://github.com/tonyg/racket-bitsyntax/), and then
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raco make driver.rkt proxy.rkt
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@ -20,9 +20,9 @@
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;;; along with marketplace-dns. If not, see
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;;; <http://www.gnu.org/licenses/>.
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(provide (struct-out domain)
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downcase-labels
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make-domain)
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(require marketplace/struct-map)
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(provide (struct-out domain))
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;; (These utilities need to be defined ahead of the domain struct
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;; definition.)
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@ -35,7 +35,10 @@
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(struct domain (labels downcased-labels)
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#:transparent
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#:property prop:equal+hash (list domain=? domain-hash-1/2 domain-hash-1/2))
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#:property prop:equal+hash (list domain=? domain-hash-1/2 domain-hash-1/2)
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#:property prop:struct-map (lambda (f seed x)
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(let-values (((labels seed) (f (domain-labels x) seed)))
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(values (make-domain labels) seed))))
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;; ListOf<Bytes> -> ListOf<Bytes>
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;; Converts the 7-bit ASCII bytes in the argument to lower-case
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188
api.rkt
188
api.rkt
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@ -1,4 +1,4 @@
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#lang racket/base
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#lang typed/racket/base
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;; Definitions for use in the API to the functionality of the library.
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;;
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;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
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@ -19,12 +19,18 @@
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;;; along with marketplace-dns. If not, see
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;;; <http://www.gnu.org/licenses/>.
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(provide (except-out (struct-out domain) domain)
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(provide DomainName
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(except-out (struct-out domain) domain)
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(rename-out [make-domain domain])
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domain-root?
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domain-parent
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(struct-out question)
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IPv4
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IPv6
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(struct-out question-repr)
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Question question question?
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QuestionPattern question-pattern question-pattern?
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question-cyclic?
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question-too-glueless?
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@ -33,14 +39,19 @@
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cname-question
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ns-question
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(struct-out answered-question)
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(struct-out answered-question-repr)
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AnsweredQuestion answered-question answered-question?
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AnsweredQuestionPattern answered-question-pattern answered-question-pattern?
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(struct-out rr)
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RR
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CompleteAnswer
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(struct-out complete-answer)
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empty-complete-answer
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merge-answers
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extract-addresses
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RData
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(struct-out rdata)
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(struct-out rdata-domain)
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(struct-out rdata-ipv4)
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@ -55,6 +66,10 @@
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(struct-out rdata-raw)
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rdata-type-pred
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RRType
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QueryType
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RRClass
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QueryClass
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type->value value->type
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qtype->value value->qtype
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class->value value->class
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@ -63,30 +78,50 @@
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(require "mapping.rkt")
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(require racket/set)
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(require racket/match)
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(require syndicate)
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(require marketplace)
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(require marketplace/struct-map)
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(require marketplace/support/pseudo-substruct)
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;; A DomainName is a (domain ListOf<Bytes>), representing a domain
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;; name. The head of the list is the leftmost label; for example,
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;; www.google.com is represented as '(#"www" #"google" #"com").
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(require "api-untyped.rkt")
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(require/typed "api-untyped.rkt"
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[#:struct domain ([labels : (Listof Bytes)]
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[downcased-labels : (Listof Bytes)])])
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(define-type DomainName domain)
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;; A ShortString is a String with length 255 or shorter.
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;; An IPv4 is a (vector Byte Byte Byte Byte), representing an IPv4
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;; address. For example, 127.0.0.1 is represented as (vector 127 0 0
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;; 1).
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(define-type IPv4 (Vector Byte Byte Byte Byte))
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;; An IPv6 is a Vector of length 16 containing Bytes, representing an
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;; IPv6 address. For example, 2001:0db8:85a3:0000:0000:8a2e:0370:7334
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;; is represented as (vector #x20 #x01 #x0d #xb8 #x85 #xa3 #x00 #x00
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;; #x00 #x00 #x8a #x2e #x03 #x70 #x73 #x34).
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(define-type IPv6 (Vector Byte Byte Byte Byte
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Byte Byte Byte Byte
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Byte Byte Byte Byte
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Byte Byte Byte Byte))
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;; A Question is a (question DomainName QueryType QueryClass
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;; QuestionContext), representing a DNS question: "What are the RRs
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;; for the given name, type and class?" as well as a possible parent
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;; question that the answer to this question is to contribute to the
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;; answer to.
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(struct question (name type class context) #:transparent)
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(struct: (TName TType TClass TContext)
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question-repr
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([name : TName] [type : TType] [class : TClass] [context : TContext])
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#:transparent)
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(pseudo-substruct: (question-repr DomainName QueryType QueryClass QuestionContext)
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Question question question?)
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(pseudo-substruct: (question-repr (U Wild DomainName)
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(U Wild QueryType)
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(U Wild QueryClass)
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(U Wild QuestionContext))
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QuestionPattern question-pattern question-pattern?)
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;; A QuestionContext is one of
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;; -- (cname-subq Question), resulting from the expansion of a CNAME
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@ -99,20 +134,33 @@
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;; excessively-glueless subquestion not represented here, and should
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;; *not* in turn be considered for gluelessness-restarting: this is
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;; needed to avoid a different kind of infinite loop.
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(struct subquestion (parent) #:transparent)
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(struct cname-subq subquestion () #:transparent)
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(struct ns-subq subquestion () #:transparent)
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(struct: subquestion ([parent : Question]) #:transparent)
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(struct: cname-subq subquestion () #:transparent)
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(struct: ns-subq subquestion () #:transparent)
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(define-type QuestionContext (U subquestion cname-subq ns-subq False 'restart))
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;; An AnsweredQuestion is an (answered-question Question
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;; Maybe<CompleteAnswer>).
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(struct answered-question (q a) #:transparent)
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(struct: (TQ TA) answered-question-repr ([q : TQ] [a : TA]) #:transparent)
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(pseudo-substruct: (answered-question-repr Question (Option CompleteAnswer))
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AnsweredQuestion answered-question answered-question?)
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(pseudo-substruct: (answered-question-repr (U Wild Question) (U Wild (Option CompleteAnswer)))
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AnsweredQuestionPattern answered-question-pattern answered-question-pattern?)
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;; A CompleteAnswer is a (complete-answer Set<RR> Set<RR> Set<RR>)
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(struct complete-answer (rrs authorities additional) #:transparent)
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(struct: complete-answer
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([rrs : (Setof RR)] [authorities : (Setof RR)] [additional : (Setof RR)])
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#:transparent)
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(define-type CompleteAnswer complete-answer)
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;; An RR is a (rr DomainName RRClass Uint32 RData),
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;; An RR is a (rr DomainName RRType RRClass Uint32 RData),
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;; representing a resource record.
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(struct rr (name class ttl rdata) #:transparent)
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(struct: rr ([name : DomainName]
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[class : RRClass]
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[ttl : Nonnegative-Integer]
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[rdata : RData])
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#:transparent)
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(define-type RR rr)
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;; An RData is one of
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;; - a DomainName, for CNAME, MB, MD, MF, MG, MR, NS and PTR records
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@ -133,20 +181,30 @@
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;;
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;; Many of these variants are obsolete in today's DNS database (marked
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;; [O] above).
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(struct rdata (type) #:transparent)
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(struct rdata-domain rdata (name) #:transparent)
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(struct rdata-ipv4 rdata (address) #:transparent)
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(struct rdata-ipv6 rdata (address) #:transparent)
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(struct rdata-hinfo rdata (cpu os) #:transparent)
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(struct rdata-minfo rdata (rmailbx emailbx) #:transparent)
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(struct rdata-mx rdata (preference exchange) #:transparent)
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(struct rdata-soa rdata (mname rname serial refresh retry expire minimum) #:transparent)
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(struct rdata-wks rdata (address protocol bitmap) #:transparent)
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(struct rdata-srv rdata (priority weight port target) #:transparent)
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(struct rdata-txt rdata (strings) #:transparent)
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(struct rdata-raw rdata (body) #:transparent)
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(struct: rdata ([type : RRType]) #:transparent)
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(struct: rdata-domain rdata ([name : DomainName]) #:transparent)
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(struct: rdata-ipv4 rdata ([address : IPv4]) #:transparent)
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(struct: rdata-ipv6 rdata ([address : IPv6]) #:transparent)
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(struct: rdata-hinfo rdata ([cpu : Bytes] [os : Bytes]) #:transparent)
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(struct: rdata-minfo rdata ([rmailbx : DomainName] [emailbx : DomainName]) #:transparent)
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(struct: rdata-mx rdata ([preference : Nonnegative-Integer] [exchange : DomainName]) #:transparent)
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(struct: rdata-soa rdata ([mname : DomainName]
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[rname : DomainName]
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[serial : Nonnegative-Integer]
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[refresh : Nonnegative-Integer]
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[retry : Nonnegative-Integer]
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[expire : Nonnegative-Integer]
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[minimum : Nonnegative-Integer]) #:transparent)
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(struct: rdata-wks rdata ([address : IPv4] [protocol : Byte] [bitmap : Bytes]) #:transparent)
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(struct: rdata-srv rdata ([priority : Nonnegative-Integer]
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[weight : Nonnegative-Integer]
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[port : Nonnegative-Integer]
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[target : DomainName]) #:transparent)
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(struct: rdata-txt rdata ([strings : (Listof Bytes)]) #:transparent)
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(struct: rdata-raw rdata ([body : Bytes]) #:transparent)
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(define-type RData rdata)
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;; (: rdata-type-pred : RRType -> (RData -> Boolean))
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(: rdata-type-pred : RRType -> (RData -> Boolean))
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(define ((rdata-type-pred t) d)
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(eq? (rdata-type d) t))
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@ -154,8 +212,12 @@
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;; in the following define-mapping. It represents the type of an
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;; RR. When used in an RR with an RData, the RRType and the RData
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;; variant must correspond.
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;; (: type->value : RRType -> Nonnegative-Integer)
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;; (: value->type : Nonnegative-Integer -> RRType)
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(define-type RRType (U 'a 'ns 'md 'mf 'cname 'soa 'mb 'mg
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'mr 'null 'wks 'ptr 'hinfo 'minfo 'mx 'txt
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'aaaa 'srv
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Nonnegative-Integer))
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(: type->value : RRType -> Nonnegative-Integer)
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(: value->type : Nonnegative-Integer -> RRType)
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(define-mapping type->value value->type
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#:forward-default values
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#:backward-default values
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@ -181,8 +243,9 @@
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;; A QueryType is a Symbol or Number (as given in the following
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;; define-mapping) or an RRType. It specifies the kinds of records
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;; being sought after in a DNS query.
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;; (: qtype->value : QueryType -> Nonnegative-Integer)
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;; (: value->qtype : Nonnegative-Integer -> QueryType)
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(define-type QueryType (U RRType 'axfr 'mailb 'maila '*))
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(: qtype->value : QueryType -> Nonnegative-Integer)
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(: value->qtype : Nonnegative-Integer -> QueryType)
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(define-mapping qtype->value value->qtype
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#:forward-default type->value
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#:backward-default value->type
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@ -195,8 +258,9 @@
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;; in the following define-mapping. It represents the "class" of DNS
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;; records being discussed. All classes except 'in are obsolete in
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;; today's DNS databases.
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;; (: class->value : RRClass -> Nonnegative-Integer)
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;; (: value->class : Nonnegative-Integer -> RRClass)
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(define-type RRClass (U 'in 'cs 'ch 'hs Nonnegative-Integer))
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(: class->value : RRClass -> Nonnegative-Integer)
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(: value->class : Nonnegative-Integer -> RRClass)
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(define-mapping class->value value->class
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#:forward-default values
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#:backward-default values
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@ -208,28 +272,48 @@
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;; A QueryClass is a Symbol or Number (as given in the following
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;; define-mapping) or an RRClass. It specifies the "class" of records
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;; being sought after in a DNS query.
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;; (: qclass->value : QueryClass -> Nonnegative-Integer)
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;; (: value->qclass : Nonnegative-Integer -> QueryClass)
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(define-type QueryClass (U RRClass '*))
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(: qclass->value : QueryClass -> Nonnegative-Integer)
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(: value->qclass : Nonnegative-Integer -> QueryClass)
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(define-mapping qclass->value value->qclass
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#:forward-default class->value
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#:backward-default value->class
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(* 255))
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|
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;; (: domain-root? : DomainName -> Boolean)
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;; ListOf<Bytes> -> ListOf<Bytes>
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;; Converts the 7-bit ASCII bytes in the argument to lower-case
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;; equivalents. Used to normalize case for domain-name comparisons.
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(: downcase-labels : (Listof Bytes) -> (Listof Bytes))
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(define (downcase-labels labels)
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(for/list ([label labels])
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(define b (make-bytes (bytes-length label)))
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(for ([i (bytes-length label)])
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(define v (bytes-ref label i))
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(bytes-set! b i (if (<= 65 v 90) (+ 32 v) v)))
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b))
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|
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;; ListOf<Bytes> -> DomainName
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;; Replacement constructor for domain structs. Automatically downcases
|
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;; labels appropriately.
|
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(: make-domain : (Listof Bytes) -> DomainName)
|
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(define (make-domain labels)
|
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(domain labels (downcase-labels labels)))
|
||||
|
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(: domain-root? : DomainName -> Boolean)
|
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(define (domain-root? d)
|
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(null? (domain-labels d)))
|
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|
||||
;; (: domain-parent : DomainName -> (Option DomainName))
|
||||
(: domain-parent : DomainName -> (Option DomainName))
|
||||
(define (domain-parent d)
|
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(and (pair? (domain-labels d))
|
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(domain (cdr (domain-labels d))
|
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(cdr (domain-downcased-labels d)))))
|
||||
|
||||
;; (: empty-complete-answer : -> CompleteAnswer)
|
||||
(: empty-complete-answer : -> CompleteAnswer)
|
||||
(define (empty-complete-answer)
|
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(complete-answer (set) (set) (set)))
|
||||
|
||||
;; (: merge-answers : CompleteAnswer CompleteAnswer -> CompleteAnswer)
|
||||
(: merge-answers : CompleteAnswer CompleteAnswer -> CompleteAnswer)
|
||||
(define (merge-answers a1 a2)
|
||||
(match-define (complete-answer n1 u1 d1) a1)
|
||||
(match-define (complete-answer n2 u2 d2) a2)
|
||||
|
|
@ -237,7 +321,7 @@
|
|||
(set-union u1 u2)
|
||||
(set-union d1 d2)))
|
||||
|
||||
;; (: extract-addresses : DomainName (Option CompleteAnswer) -> (Setof IPv4))
|
||||
(: extract-addresses : DomainName (Option CompleteAnswer) -> (Setof IPv4))
|
||||
(define (extract-addresses name ans)
|
||||
(match ans
|
||||
[#f ;; name-error/NXDOMAIN, so definitely no addresses.
|
||||
|
|
@ -245,12 +329,12 @@
|
|||
[(complete-answer ns us ds)
|
||||
(define rrs (set->list (set-union ns us ds)))
|
||||
(let loop ((names (list name))
|
||||
(ips (set))
|
||||
(seen (set)))
|
||||
(ips ((inst set IPv4)))
|
||||
(seen ((inst set DomainName))))
|
||||
(if (null? names)
|
||||
ips
|
||||
(let* ((name (car names))
|
||||
(records (filter (lambda (rr) (equal? name (rr-name rr))) rrs))
|
||||
(records (filter (lambda: ([rr : RR]) (equal? name (rr-name rr))) rrs))
|
||||
(data (map rr-rdata records)))
|
||||
(if (set-member? seen name)
|
||||
(loop (cdr names) ips seen)
|
||||
|
|
@ -264,10 +348,10 @@
|
|||
;; #t iff this question is being asked in order to supply answers
|
||||
;; contributing to a parent context that's trying to answer exactly
|
||||
;; this question.
|
||||
;; (: question-cyclic? : Question -> Boolean)
|
||||
(: question-cyclic? : Question -> Boolean)
|
||||
(define (question-cyclic? q)
|
||||
(match-define (question name type class parent) q)
|
||||
(let search ((ancestor parent))
|
||||
(let: search : Boolean ((ancestor : QuestionContext parent))
|
||||
(match ancestor
|
||||
[(subquestion (question (== name) (== type) (== class) _)) #t] ;; uh-oh! A cycle!
|
||||
[(subquestion (question _ _ _ ancestor-parent)) (search ancestor-parent)] ;; recursive case
|
||||
|
|
@ -279,10 +363,10 @@
|
|||
;; from the outside world, then that's too glueless. See
|
||||
;; http://cr.yp.to/djbdns/notes.html in the sections "Gluelessness"
|
||||
;; and "Expiring glue".
|
||||
;; (: question-too-glueless? : Question -> Boolean)
|
||||
(: question-too-glueless? : Question -> Boolean)
|
||||
(define (question-too-glueless? q)
|
||||
(define count
|
||||
(let search ((q q) (acc 0))
|
||||
(let: search : Integer ((q : Question q) (acc : Integer 0))
|
||||
(match-define (question _ _ _ parent) q)
|
||||
(cond
|
||||
[(ns-subq? parent) (search (subquestion-parent parent) (+ acc 1))]
|
||||
|
|
@ -298,7 +382,7 @@
|
|||
;; Question -> Boolean
|
||||
;; #t iff this question is being asked in the context of some
|
||||
;; excessively glueless subquestion.
|
||||
;; (: question-restarted? : Question -> Boolean)
|
||||
(: question-restarted? : Question -> Boolean)
|
||||
(define (question-restarted? q)
|
||||
(match-define (question name type class parent) q)
|
||||
(let search ((ancestor parent))
|
||||
|
|
@ -310,19 +394,19 @@
|
|||
;; Question -> Question
|
||||
;; Returns a question equivalent to q, but in a 'restart context, for
|
||||
;; retracing from the roots in cases of excessive gluelessness.
|
||||
;; (: restart-question : Question -> Question)
|
||||
(: restart-question : Question -> Question)
|
||||
(define (restart-question q)
|
||||
(struct-copy question q [context 'restart]))
|
||||
(struct-copy question-repr q [context 'restart]))
|
||||
|
||||
;; DomainName Question -> Question
|
||||
;; Produces a new question with CNAME context.
|
||||
;; (: cname-question : DomainName Question -> Question)
|
||||
(: cname-question : DomainName Question -> Question)
|
||||
(define (cname-question name q)
|
||||
(match-define (question _ type class _) q)
|
||||
(question name type class (cname-subq q)))
|
||||
|
||||
;; DomainName Question -> Question
|
||||
;; Produces a new question with NS context.
|
||||
;; (: ns-question : DomainName Question -> Question)
|
||||
(: ns-question : DomainName Question -> Question)
|
||||
(define (ns-question name q)
|
||||
(question name 'a 'in (ns-subq q))) ;; TODO: 'aaaa ?
|
||||
|
|
|
|||
93
codec.rkt
93
codec.rkt
|
|
@ -1,4 +1,4 @@
|
|||
#lang racket/base
|
||||
#lang typed/racket/base
|
||||
;; DNS wire-protocol codec.
|
||||
;;
|
||||
;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
|
||||
|
|
@ -19,9 +19,17 @@
|
|||
;;; along with marketplace-dns. If not, see
|
||||
;;; <http://www.gnu.org/licenses/>.
|
||||
|
||||
(provide value->query-opcode query-opcode->value
|
||||
(provide Opcode
|
||||
ResponseCode
|
||||
value->query-opcode query-opcode->value
|
||||
value->query-response-code query-response-code->value
|
||||
|
||||
DNSMessage
|
||||
Direction
|
||||
Authoritativeness
|
||||
Truncatedness
|
||||
RecursionDesired
|
||||
RecursionAvailable
|
||||
(struct-out dns-message)
|
||||
|
||||
packet->dns-message
|
||||
|
|
@ -42,8 +50,9 @@
|
|||
;; 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.
|
||||
;; (: value->query-opcode : Nonnegative-Integer -> Opcode)
|
||||
;; (: query-opcode->value : Opcode -> Nonnegative-Integer)
|
||||
(define-type Opcode (U 'query 'iquery 'status Nonnegative-Integer))
|
||||
(: value->query-opcode : Nonnegative-Integer -> Opcode)
|
||||
(: query-opcode->value : Opcode -> Nonnegative-Integer)
|
||||
(define-mapping value->query-opcode query-opcode->value
|
||||
#:forward-default values
|
||||
#:backward-default values
|
||||
|
|
@ -54,8 +63,11 @@
|
|||
;; 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.
|
||||
;; (: value->query-response-code : Nonnegative-Integer -> ResponseCode)
|
||||
;; (: query-response-code->value : ResponseCode -> Nonnegative-Integer)
|
||||
(define-type ResponseCode (U 'no-error 'format-error 'server-failure
|
||||
'name-error 'not-implemented 'refused
|
||||
Nonnegative-Integer))
|
||||
(: value->query-response-code : Nonnegative-Integer -> ResponseCode)
|
||||
(: query-response-code->value : ResponseCode -> Nonnegative-Integer)
|
||||
(define-mapping value->query-response-code query-response-code->value
|
||||
(0 no-error)
|
||||
(1 format-error)
|
||||
|
|
@ -71,24 +83,25 @@
|
|||
;;
|
||||
;; 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)
|
||||
;; (define-type Direction (U 'request 'response))
|
||||
;; (define-type Authoritativeness (U 'non-authoritative 'authoritative))
|
||||
;; (define-type Truncatedness (U 'not-truncated 'truncated))
|
||||
;; (define-type RecursionDesired (U 'no-recursion-desired 'recursion-desired))
|
||||
;; (define-type RecursionAvailable (U 'no-recursion-available 'recursion-available))
|
||||
(struct: dns-message ([id : Nonnegative-Integer]
|
||||
[direction : Direction]
|
||||
[opcode : Opcode]
|
||||
[authoritative : Authoritativeness]
|
||||
[truncated : Truncatedness]
|
||||
[recursion-desired : RecursionDesired]
|
||||
[recursion-available : RecursionAvailable]
|
||||
[response-code : ResponseCode]
|
||||
[questions : (Listof Question)]
|
||||
[answers : (Listof RR)]
|
||||
[authorities : (Listof RR)]
|
||||
[additional : (Listof RR)])
|
||||
#:transparent)
|
||||
(define-type DNSMessage dns-message)
|
||||
(define-type Direction (U 'request 'response))
|
||||
(define-type Authoritativeness (U 'non-authoritative 'authoritative))
|
||||
(define-type Truncatedness (U 'not-truncated 'truncated))
|
||||
(define-type RecursionDesired (U 'no-recursion-desired 'recursion-desired))
|
||||
(define-type RecursionAvailable (U 'no-recursion-available 'recursion-available))
|
||||
|
||||
;; Bit-syntax type for counted repeats of a value.
|
||||
;; Example: Length-prefixed list of 32-bit unsigned words:
|
||||
|
|
@ -102,7 +115,7 @@
|
|||
;; here, but I can't find a way of expressing the types
|
||||
;; required while making that work. This way, we avoid needing
|
||||
;; to mention the type of the result of calls to ks.
|
||||
;; (: loop : Integer (Listof Type) BitString -> (Values (Option (Listof Type)) BitString))
|
||||
(: loop : Integer (Listof Type) BitString -> (Values (Option (Listof Type)) BitString))
|
||||
(define (loop count acc input)
|
||||
(cond
|
||||
((positive? count) (bit-string-case input
|
||||
|
|
@ -145,7 +158,7 @@
|
|||
(else
|
||||
(kf))))
|
||||
((_ #f vs Type option ...)
|
||||
(let loop ((vs vs))
|
||||
(let: loop : BitString ((vs : (Listof Type) vs))
|
||||
(cond
|
||||
((pair? vs) (bit-string ((car vs) :: option ...)
|
||||
((loop (cdr vs)) :: binary)))
|
||||
|
|
@ -189,7 +202,7 @@
|
|||
;; +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
;; </rfc1035>
|
||||
|
||||
;; (: packet->dns-message : BitString -> DNSMessage)
|
||||
(: packet->dns-message : BitString -> DNSMessage)
|
||||
;; Parse an encoded DNS message packet into the corresponding Racket
|
||||
;; structure. Raises an exception on failure.
|
||||
(define (packet->dns-message packet)
|
||||
|
|
@ -219,7 +232,7 @@
|
|||
(value->query-response-code rcode)
|
||||
q-section a-section auth-section additional-section))))
|
||||
|
||||
;; (: dns-message->packet : DNSMessage -> Bytes)
|
||||
(: dns-message->packet : DNSMessage -> Bytes)
|
||||
;; Render a Racket structured DNS message using the DNS binary encoding.
|
||||
(define (dns-message->packet m)
|
||||
(bit-string->bytes
|
||||
|
|
@ -275,14 +288,14 @@
|
|||
((_ #f val)
|
||||
(encode-domain-name val))))
|
||||
|
||||
;; (: encode-domain-name : DomainName -> BitString)
|
||||
(: encode-domain-name : DomainName -> BitString)
|
||||
(define (encode-domain-name name)
|
||||
(define labels (domain-labels name))
|
||||
(bit-string (labels :: (t:listof Bytes (t:pascal-string "Label" 64)))
|
||||
(0 :: integer bytes 1))) ;; end of list of labels!
|
||||
|
||||
;; (: parse-domain-name :
|
||||
;; BitString BitString (Listof Natural) -> (Values (Listof Bytes) BitString))
|
||||
(: parse-domain-name :
|
||||
BitString BitString (Listof Natural) -> (Values (Listof Bytes) BitString))
|
||||
;; PRECONDITION: input never empty
|
||||
;; INVARIANT: pointers-followed contains every "jump target" we have
|
||||
;; jumped to so far during decoding of this domain-name, in order to
|
||||
|
|
@ -324,7 +337,7 @@
|
|||
((_ #f val)
|
||||
(t:pascal-string #f val "Character-string" 256))
|
||||
((_ #f val string-kind length-limit)
|
||||
(let ([s val])
|
||||
(let: ([s : Bytes val])
|
||||
(let ((len (bytes-length s)))
|
||||
(when (>= len length-limit)
|
||||
(error 't:pascal-string "~s too long: ~v" string-kind s))
|
||||
|
|
@ -364,10 +377,10 @@
|
|||
#f)
|
||||
tail))))
|
||||
((_ #f val)
|
||||
(let ([q val])
|
||||
(bit-string ((question-name q) :: (t:domain-name))
|
||||
((qtype->value (question-type q)) :: bits 16)
|
||||
((qclass->value (question-class q)) :: bits 16))))))
|
||||
(let: ([q : Question val])
|
||||
(bit-string ((question-repr-name q) :: (t:domain-name))
|
||||
((qtype->value (question-repr-type q)) :: bits 16)
|
||||
((qclass->value (question-repr-class q)) :: bits 16))))))
|
||||
|
||||
;; <rfc1035>
|
||||
;; All RRs have the same top level format shown below:
|
||||
|
|
@ -416,7 +429,7 @@
|
|||
tail)))
|
||||
(else (kf)))))
|
||||
((_ #f val)
|
||||
(let ([rr val])
|
||||
(let: ([rr : RR val])
|
||||
(let ((encoded-rdata (encode-rdata (rr-rdata rr))))
|
||||
(bit-string ((rr-name rr) :: (t:domain-name))
|
||||
((type->value (rdata-type (rr-rdata rr))) :: bits 16)
|
||||
|
|
@ -425,7 +438,7 @@
|
|||
((quotient (bit-string-length encoded-rdata) 8) :: bits 16)
|
||||
(encoded-rdata :: binary)))))))
|
||||
|
||||
;; (: decode-rdata : BitString RRType BitString -> RData)
|
||||
(: decode-rdata : BitString RRType BitString -> RData)
|
||||
;; Decode RData according to the RRType. Takes the whole packet for
|
||||
;; the same reason as t:rr does.
|
||||
(define (decode-rdata whole-packet type rdata)
|
||||
|
|
@ -474,7 +487,7 @@
|
|||
(rdata-srv type priority weight port target))))
|
||||
(else (rdata-raw type (bit-string->bytes rdata)))))
|
||||
|
||||
;; (: encode-rdata : RData -> BitString)
|
||||
(: encode-rdata : RData -> BitString)
|
||||
;; Encode RData according to its RRType.
|
||||
(define (encode-rdata rdata)
|
||||
(match rdata
|
||||
|
|
@ -506,5 +519,5 @@
|
|||
[(rdata-raw _ bs) bs]))
|
||||
|
||||
;; UInt32
|
||||
;; (: max-ttl : Nonnegative-Integer)
|
||||
(: max-ttl : Nonnegative-Integer)
|
||||
(define max-ttl #xffffffff)
|
||||
|
|
|
|||
44
driver.rkt
44
driver.rkt
|
|
@ -1,4 +1,4 @@
|
|||
#lang racket/base
|
||||
#lang typed/racket/base
|
||||
;; DNS server using os-big-bang.rkt and os-udp.rkt.
|
||||
;;
|
||||
;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
|
||||
|
|
@ -28,9 +28,9 @@
|
|||
(require "codec.rkt")
|
||||
(require "zonedb.rkt")
|
||||
(require "resolver.rkt")
|
||||
(require syndicate/ground)
|
||||
(require syndicate/actor)
|
||||
(require syndicate/drivers/udp)
|
||||
(require marketplace/sugar-typed)
|
||||
(require marketplace/support/spy)
|
||||
(require marketplace/drivers/udp)
|
||||
(require "tk-dns.rkt")
|
||||
|
||||
;; Instantiated with a SOA record for the zone it is serving as well
|
||||
|
|
@ -46,7 +46,7 @@
|
|||
;; determines subzones based on the RRs it is configured with at
|
||||
;; startup.
|
||||
|
||||
;; (: start-server : Nonnegative-Integer RR (Listof RR) -> Void)
|
||||
(: start-server : Nonnegative-Integer 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.
|
||||
|
|
@ -58,24 +58,26 @@
|
|||
|
||||
(display ";; Ready.\n")
|
||||
|
||||
(run-ground (spawn-udp-driver)
|
||||
(dataspace (dns-spy)
|
||||
(dns-read-driver local-addr)
|
||||
(dns-write-driver local-addr)
|
||||
(forever
|
||||
(on (message ($ p (bad-dns-packet _ _ _ _)))
|
||||
(log-error (pretty-format p)))
|
||||
(on (message ($ r (dns-request _ _ _)))
|
||||
(let ((reply (handle-request soa-rr zone r)))
|
||||
(when reply (send! reply))))))))
|
||||
(ground-vm: ((inst udp-driver Void))
|
||||
((inst generic-spy Void) 'UDP)
|
||||
(spawn-vm: : Void
|
||||
(spawn: #:parent : Void #:child : Void (dns-spy))
|
||||
(spawn: #:parent : Void #:child : Void (dns-read-driver local-addr))
|
||||
(spawn: #:parent : Void #:child : Void (dns-write-driver local-addr))
|
||||
(subscriber: Void (bad-dns-packet-pattern (wild) (wild) (wild) (wild))
|
||||
(on-message [p (begin (log-error (pretty-format p)) '())]))
|
||||
(subscriber: Void (dns-request-pattern (wild) (wild) (wild))
|
||||
(on-message [(? dns-request? r)
|
||||
(let ((reply (handle-request soa-rr zone r)))
|
||||
(when reply (send-message reply)))])))))
|
||||
|
||||
;; (define-type ReplyMaker (DomainName Boolean (Setof RR) (Setof RR) (Setof RR) -> DNSMessage))
|
||||
(define-type ReplyMaker (DomainName Boolean (Setof RR) (Setof RR) (Setof RR) -> DNSMessage))
|
||||
|
||||
;; (: handle-request : RR CompiledZone DNSRequest -> (Option DNSReply))
|
||||
(: handle-request : RR CompiledZone DNSRequest -> (Option DNSReply))
|
||||
(define (handle-request soa-rr zone request)
|
||||
(match-define (dns-request request-message request-source request-sink) request)
|
||||
|
||||
;; (: make-reply : ReplyMaker)
|
||||
(: make-reply : ReplyMaker)
|
||||
(define (make-reply name send-name-error? answers authorities additional)
|
||||
(dns-message (dns-message-id request-message)
|
||||
'response
|
||||
|
|
@ -90,7 +92,7 @@
|
|||
(rr-set->list authorities)
|
||||
(rr-set->list additional)))
|
||||
|
||||
;; (: answer-question : Question ReplyMaker -> DNSMessage)
|
||||
(: answer-question : Question ReplyMaker -> DNSMessage)
|
||||
(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
|
||||
|
|
@ -108,7 +110,7 @@
|
|||
;; here. Reexamine the rules for doing so.
|
||||
(match-define (question qname qtype qclass #f) q)
|
||||
|
||||
;; (: expand-cnames : (Listof DomainName) CompleteAnswer -> DNSMessage)
|
||||
(: expand-cnames : (Listof DomainName) CompleteAnswer -> DNSMessage)
|
||||
(define (expand-cnames worklist ans)
|
||||
(match worklist
|
||||
['()
|
||||
|
|
@ -118,7 +120,7 @@
|
|||
(define a (resolve-from-zone (cname-question next-cname q) zone soa-rr (set)))
|
||||
(incorporate-answer a rest ans)]))
|
||||
|
||||
;; (: incorporate-answer : Answer (Listof DomainName) CompleteAnswer -> DNSMessage)
|
||||
(: incorporate-answer : Answer (Listof DomainName) CompleteAnswer -> DNSMessage)
|
||||
(define (incorporate-answer this-answer worklist ans)
|
||||
(match this-answer
|
||||
[(partial-answer new-info more-cnames)
|
||||
|
|
|
|||
|
|
@ -1,41 +0,0 @@
|
|||
#lang racket
|
||||
|
||||
(require net/url)
|
||||
|
||||
(define records
|
||||
(map (lambda (r) (string-split r "\t"))
|
||||
(string-split (port->string
|
||||
(get-pure-port
|
||||
(string->url "http://www.internic.net/domain/root.zone")))
|
||||
"\n")))
|
||||
|
||||
(define (split-host-str s)
|
||||
(map string->bytes/utf-8 (string-split s ".")))
|
||||
|
||||
(define (split-ip-str s)
|
||||
(list->vector (map string->number (string-split s "."))))
|
||||
|
||||
(pretty-write
|
||||
`(list
|
||||
,@(filter values
|
||||
(for/list [(r records)]
|
||||
(match r
|
||||
[(list "."
|
||||
""
|
||||
""
|
||||
ttl-str
|
||||
"IN"
|
||||
"NS"
|
||||
(regexp #px"^(.+)\\.$" (list _ host-str)))
|
||||
`(NS/ttl '()
|
||||
',(split-host-str host-str)
|
||||
,(string->number ttl-str))]
|
||||
[(list (regexp #px"^([^.]+\\.root-servers\\.net)\\.$" (list _ host-str))
|
||||
ttl-str
|
||||
"IN"
|
||||
"A"
|
||||
ip-str)
|
||||
`(A/ttl ',(split-host-str host-str)
|
||||
',(split-ip-str ip-str)
|
||||
,(string->number ttl-str))]
|
||||
[_ #f])))))
|
||||
|
|
@ -1,4 +1,4 @@
|
|||
#lang racket/base
|
||||
#lang typed/racket/base
|
||||
;; Macros for defining weak and extensible mappings between sets of values
|
||||
;;
|
||||
;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
#lang racket/base
|
||||
#lang typed/racket/base
|
||||
;;
|
||||
;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
|
||||
;;;
|
||||
|
|
@ -23,13 +23,17 @@
|
|||
(require "api.rkt")
|
||||
(require "codec.rkt")
|
||||
(require "zonedb.rkt")
|
||||
(require syndicate/actor)
|
||||
(require syndicate/drivers/udp)
|
||||
(require syndicate/drivers/timer)
|
||||
(require marketplace/sugar-typed)
|
||||
(require marketplace/drivers/udp)
|
||||
(require marketplace/drivers/timer)
|
||||
(require marketplace/support/pseudo-substruct)
|
||||
(require "tk-dns.rkt")
|
||||
(require (rename-in marketplace/tr-struct-copy [tr-struct-copy struct-copy])) ;; PR13149
|
||||
|
||||
(provide network-query
|
||||
(struct-out network-reply))
|
||||
(struct-out network-reply-repr)
|
||||
NetworkReply network-reply network-reply?
|
||||
NetworkReplyPattern network-reply-pattern network-reply-pattern?)
|
||||
|
||||
;; DJB's rules for handling DNS responses. Some of these are handled
|
||||
;; here (specifically, rules 2 through 5, in the action of
|
||||
|
|
@ -123,18 +127,48 @@
|
|||
|
||||
(define first-timeout 3) ;; seconds
|
||||
|
||||
;; A NetworkRequest is a (network-request UdpAddress Question
|
||||
;; DomainName NEListOf<DomainName> UniqueID) representing the
|
||||
;; parameters used to start and process a network query.
|
||||
(struct: network-request ([client-socket : UdpAddress]
|
||||
[question : Question]
|
||||
[zone-origin : DomainName]
|
||||
[server-names : (Listof DomainName)]
|
||||
[unique-id : Any])
|
||||
#:transparent)
|
||||
(define-type NetworkRequest network-request)
|
||||
|
||||
;; A NetworkReply is a (network-reply UniqueID Maybe<CompleteAnswer>)
|
||||
;; representing the final result of a network query.
|
||||
(struct network-reply (unique-id answer) #:transparent)
|
||||
(struct: (TId TAnswer)
|
||||
network-reply-repr
|
||||
([unique-id : TId] [answer : TAnswer]) #:transparent)
|
||||
(pseudo-substruct: (network-reply-repr Any (Option CompleteAnswer))
|
||||
NetworkReply network-reply network-reply?)
|
||||
(pseudo-substruct: (network-reply-repr (U Wild Any) (U Wild (Option CompleteAnswer)))
|
||||
NetworkReplyPattern network-reply-pattern network-reply-pattern?)
|
||||
|
||||
;; (: next-timeout : Natural -> (Option Natural))
|
||||
;; A NetworkQueryState is a (network-query-state NetworkRequest
|
||||
;; Integer Map<DomainName,ListOf<UdpAddress>> ListOf<UdpAddress>
|
||||
;; Maybe<DomainName> ListOf<DomainName>), representing an in-progress
|
||||
;; DNS network query.
|
||||
(struct: network-query-state ([request : NetworkRequest]
|
||||
[timeout : (Option Natural)]
|
||||
[known-addresses : (HashTable DomainName (Listof UdpAddress))]
|
||||
[remaining-addresses : (Listof UdpAddress)]
|
||||
[current-name : (Option DomainName)]
|
||||
[remaining-names : (Listof DomainName)])
|
||||
#:transparent)
|
||||
(define-type NetworkQueryState network-query-state)
|
||||
|
||||
(: next-timeout : Natural -> (Option Natural))
|
||||
(define (next-timeout timeout)
|
||||
(cond
|
||||
[(equal? timeout 3) 11]
|
||||
[(equal? timeout 11) 45]
|
||||
[else #f]))
|
||||
|
||||
;; (: make-dns-query-message : Question Nonnegative-Integer -> DNSMessage)
|
||||
(: make-dns-query-message : Question Nonnegative-Integer -> DNSMessage)
|
||||
(define (make-dns-query-message q query-id)
|
||||
(dns-message query-id
|
||||
'request
|
||||
|
|
@ -149,9 +183,9 @@
|
|||
'()
|
||||
'()))
|
||||
|
||||
;; (define-type CheckedAnswer (U (Option CompleteAnswer) 'bad-answer 'lame-delegation))
|
||||
(define-type CheckedAnswer (U (Option CompleteAnswer) 'bad-answer 'lame-delegation))
|
||||
|
||||
;; (: filter-dns-reply : Question DNSMessage DomainName -> CheckedAnswer)
|
||||
(: filter-dns-reply : Question DNSMessage DomainName -> CheckedAnswer)
|
||||
;; Filters RRs from the answer, authorities, and additional sections
|
||||
;; of the passed-in `message`, returning the set of RRs surviving the
|
||||
;; filter. RRs are only accepted if their `rr-name` falls in the
|
||||
|
|
@ -166,24 +200,25 @@
|
|||
(define (filter-dns-reply q message zone-origin)
|
||||
(case (dns-message-response-code message)
|
||||
[(no-error)
|
||||
;; (: f : (Listof RR) -> (Setof RR))
|
||||
(: f : (Listof RR) -> (Setof RR))
|
||||
(define (f l)
|
||||
(list->set (filter (lambda (claim-rr) (in-bailiwick? (rr-name claim-rr) zone-origin)) l)))
|
||||
(list->set (filter (lambda: ([claim-rr : RR])
|
||||
(in-bailiwick? (rr-name claim-rr) zone-origin)) l)))
|
||||
;; Here's where we do the "lame referral" check. This code is
|
||||
;; nice and simple (though wrong) without it. Ho hum.
|
||||
(define answers (f (dns-message-answers message)))
|
||||
(define unfiltered-authorities (dns-message-authorities message))
|
||||
(define non-subzone-ns-rrs ;; all NS authorities not for a STRICT subzone of our zone-origin
|
||||
(filter (lambda (rr) (and (eqv? (rdata-type (rr-rdata rr)) 'ns)
|
||||
(or (equal? (rr-name rr) zone-origin)
|
||||
(not (in-bailiwick? (rr-name rr) zone-origin)))))
|
||||
(filter (lambda: ([rr : RR]) (and (eqv? (rdata-type (rr-rdata rr)) 'ns)
|
||||
(or (equal? (rr-name rr) zone-origin)
|
||||
(not (in-bailiwick? (rr-name rr) zone-origin)))))
|
||||
unfiltered-authorities))
|
||||
(define authorities (f unfiltered-authorities))
|
||||
(define answers-to-q ;; answers specifically to the question we asked
|
||||
(set-filter (lambda (rr) (equal? (rr-name rr) (question-name q))) answers))
|
||||
(set-filter (lambda: ([rr : RR]) (equal? (rr-name rr) (question-repr-name q))) answers))
|
||||
(define lame?
|
||||
(and (set-empty? (filter-by-type answers-to-q 'cname))
|
||||
(set-empty? (filter-rrs answers-to-q (question-type q) (question-class q)))
|
||||
(set-empty? (filter-rrs answers-to-q (question-repr-type q) (question-repr-class q)))
|
||||
(set-empty? (filter-by-type authorities 'soa))
|
||||
(not (null? non-subzone-ns-rrs))))
|
||||
(if lame?
|
||||
|
|
@ -193,129 +228,171 @@
|
|||
(f (dns-message-additional message))))]
|
||||
[(name-error) #f]
|
||||
[else
|
||||
(log-info "Abnormal response-code ~v in response to questions ~v"
|
||||
(dns-message-response-code message)
|
||||
(dns-message-questions message))
|
||||
(log-info (format "Abnormal response-code ~v in response to questions ~v"
|
||||
(dns-message-response-code message)
|
||||
(dns-message-questions message)))
|
||||
'bad-answer]))
|
||||
|
||||
;; (: ip->host-name : IPv4 -> String)
|
||||
(: ip->host-name : IPv4 -> String)
|
||||
(define (ip->host-name ip-address)
|
||||
(match-define (vector a b c d) ip-address)
|
||||
(format "~a.~a.~a.~a" a b c d))
|
||||
|
||||
;; (: make-dns-address : IPv4 -> UdpAddress)
|
||||
(: make-dns-address : IPv4 -> UdpAddress)
|
||||
(define (make-dns-address ip-address)
|
||||
(udp-remote-address (ip->host-name ip-address) 53))
|
||||
|
||||
;; (: network-query : (All (ParentState)
|
||||
;; UdpAddress Question DomainName (Listof DomainName) Any ->
|
||||
;; Void))
|
||||
(: network-query : (All (ParentState)
|
||||
UdpAddress Question DomainName (Listof DomainName) Any ->
|
||||
(Action ParentState)))
|
||||
(define (network-query s q zone-origin server-names unique-id)
|
||||
(spawn*
|
||||
#:name (list 'network-query q)
|
||||
(field [timeout first-timeout]
|
||||
[known-addresses #hash()] ;; Hash DomainName (Listof UdpAddress)
|
||||
[remaining-addresses '()] ;; Listof UdpAddress
|
||||
[current-name #f] ;; Option DomainName
|
||||
[remaining-names server-names]) ;; Listof DomainName
|
||||
(name-process (list 'network-query q)
|
||||
(spawn: #:parent : ParentState
|
||||
#:child : NetworkQueryState
|
||||
(try-next-server
|
||||
(network-query-state (network-request s q zone-origin server-names unique-id)
|
||||
first-timeout
|
||||
(ann #hash() (HashTable DomainName (Listof UdpAddress)))
|
||||
'()
|
||||
#f
|
||||
server-names)))))
|
||||
|
||||
(define (on-answer ans server-ip)
|
||||
(match ans
|
||||
['bad-answer ;; can come from filter-dns-reply
|
||||
(try-next-server)]
|
||||
['lame-delegation ;; can come from filter-dns-reply
|
||||
(log-info "Lame delegation received from ~v (at ~v) in bailiwick ~v in response to ~v"
|
||||
(current-name)
|
||||
server-ip
|
||||
zone-origin
|
||||
q)
|
||||
(when (and (current-name) server-ip)
|
||||
;; Actually remove the offending IP address so it's never tried again.
|
||||
(known-addresses (hash-update (known-addresses)
|
||||
(current-name)
|
||||
(lambda (addrs) (remove server-ip addrs)))))
|
||||
(try-next-server)]
|
||||
[(and (or (? complete-answer?) #f) ans)
|
||||
(send! (network-reply unique-id ans))]))
|
||||
(: try-next-server : NetworkQueryState -> (Transition NetworkQueryState))
|
||||
(define (try-next-server w)
|
||||
(define timeout (network-query-state-timeout w))
|
||||
(if (not timeout)
|
||||
;; No more timeouts to try, so give up.
|
||||
(on-answer w (empty-complete-answer) #f)
|
||||
(match w
|
||||
[(network-query-state req _ _ '() _ '())
|
||||
;; No more addresses to try with this timeout. Refill the list
|
||||
;; and bump the timeout and retry.
|
||||
;; TODO: randomize ordering of servers in list. (Don't forget the initial fill.)
|
||||
(try-next-server (struct-copy network-query-state w
|
||||
[timeout (next-timeout timeout)]
|
||||
[remaining-addresses '()]
|
||||
[current-name #f]
|
||||
[remaining-names (network-request-server-names req)]))]
|
||||
[(network-query-state req _ known-addresses '() _ (cons current-name remaining-names))
|
||||
(if (hash-has-key? known-addresses current-name)
|
||||
(try-next-server (struct-copy network-query-state w
|
||||
[remaining-addresses (hash-ref known-addresses current-name)]
|
||||
[current-name current-name]
|
||||
[remaining-names remaining-names]))
|
||||
(let ((subq (ns-question current-name (network-request-question req))))
|
||||
(transition: (struct-copy network-query-state w
|
||||
[current-name current-name]
|
||||
[remaining-names remaining-names]) : NetworkQueryState
|
||||
(send-message subq)
|
||||
(let-fresh (subq-id)
|
||||
(name-endpoint subq-id
|
||||
(subscriber: NetworkQueryState (answered-question-pattern subq (wild))
|
||||
(match-state w
|
||||
(on-message
|
||||
[(answered-question (== subq) ans)
|
||||
(let ((ips (map make-dns-address
|
||||
(set->list (extract-addresses current-name ans)))))
|
||||
(sequence-actions
|
||||
(try-next-server (struct-copy network-query-state w
|
||||
[known-addresses (hash-set known-addresses
|
||||
current-name
|
||||
ips)]
|
||||
[remaining-addresses ips]))
|
||||
(delete-endpoint subq-id)))]))))))))]
|
||||
[(network-query-state req _ _ (cons current-ip remaining-ips) _ _)
|
||||
(define rpc-id (gensym 'network-query/allocate-query-id))
|
||||
(transition: w : NetworkQueryState
|
||||
(send-message `(request ,rpc-id allocate-query-id))
|
||||
(name-endpoint rpc-id
|
||||
(subscriber: NetworkQueryState `(reply ,rpc-id ,(wild))
|
||||
(match-state w
|
||||
(on-message
|
||||
[`(reply ,(== rpc-id) ,(? exact-nonnegative-integer? id))
|
||||
(sequence-actions (send-request (struct-copy network-query-state w
|
||||
[remaining-addresses remaining-ips])
|
||||
id
|
||||
timeout
|
||||
current-ip)
|
||||
(delete-endpoint rpc-id))])))))])))
|
||||
|
||||
(define (try-next-server)
|
||||
(if (not (timeout))
|
||||
;; No more timeouts to try, so give up.
|
||||
(on-answer (empty-complete-answer) #f)
|
||||
(match (remaining-addresses)
|
||||
['()
|
||||
(match (remaining-names)
|
||||
['()
|
||||
;; No more addresses to try with this timeout. Refill the list
|
||||
;; and bump the timeout and retry.
|
||||
;; TODO: randomize ordering of servers in list. (Don't forget the initial fill.)
|
||||
(timeout (next-timeout (timeout)))
|
||||
(current-name #f)
|
||||
(remaining-names server-names)
|
||||
(try-next-server)]
|
||||
[(cons next-name new-remaining-names)
|
||||
(current-name next-name)
|
||||
(remaining-names new-remaining-names)
|
||||
(if (hash-has-key? (known-addresses) next-name)
|
||||
(begin (remaining-addresses (hash-ref (known-addresses) (current-name)))
|
||||
(try-next-server))
|
||||
(let ((subq (ns-question next-name q)))
|
||||
(react (on-start (send! subq))
|
||||
(stop-when (message (answered-question subq $ans))
|
||||
(define ips
|
||||
(for/list [(a (extract-addresses next-name ans))]
|
||||
(make-dns-address a)))
|
||||
(known-addresses (hash-set (known-addresses) next-name ips))
|
||||
(remaining-addresses ips)
|
||||
(try-next-server)))))])]
|
||||
[(cons current-ip new-remaining-ips)
|
||||
(remaining-addresses new-remaining-ips)
|
||||
(define rpc-id (gensym 'network-query/allocate-query-id))
|
||||
(react (on-start (send! `(request ,rpc-id allocate-query-id)))
|
||||
(stop-when (message `(reply ,rpc-id ,(? exact-nonnegative-integer? $id)))
|
||||
(remaining-addresses new-remaining-ips)
|
||||
(send-request id current-ip)))])))
|
||||
(: on-answer : NetworkQueryState CheckedAnswer (Option UdpAddress)
|
||||
-> (Transition NetworkQueryState))
|
||||
(define (on-answer w ans server-ip)
|
||||
(match ans
|
||||
['bad-answer ;; can come from filter-dns-reply
|
||||
(try-next-server w)]
|
||||
['lame-delegation ;; can come from filter-dns-reply
|
||||
(match-define (network-query-state req _ known-addresses _ current-name _) w)
|
||||
(match-define (network-request _ q zone-origin _ _) req)
|
||||
(log-info (format "Lame delegation received from ~v (at ~v) in bailiwick ~v in response to ~v"
|
||||
current-name
|
||||
server-ip
|
||||
zone-origin
|
||||
q))
|
||||
(try-next-server (if (and current-name server-ip)
|
||||
;; Actually remove the offending IP address so it's never tried again.
|
||||
(struct-copy network-query-state w
|
||||
[known-addresses (hash-update known-addresses
|
||||
current-name
|
||||
(lambda: ([addrs : (Listof
|
||||
UdpAddress)])
|
||||
(remove server-ip addrs)))])
|
||||
w))]
|
||||
[(and (or (? complete-answer?) #f) ans)
|
||||
(transition: w : NetworkQueryState
|
||||
(send-message (network-reply (network-request-unique-id (network-query-state-request w))
|
||||
ans)))]))
|
||||
|
||||
(define (send-request query-id server-ip)
|
||||
(define query (make-dns-query-message q query-id))
|
||||
(define reply-wait-id (list s query-id 'reply-wait))
|
||||
(define timeout-id (list s query-id 'timeout))
|
||||
(define start-time (current-inexact-milliseconds))
|
||||
(log-debug "Sending ~v ~v to ~v ~v with ~v seconds of timeout"
|
||||
q query-id
|
||||
zone-origin server-ip
|
||||
(timeout))
|
||||
;; NB: ANALYSIS: Previous implementation of this used a
|
||||
;; quasi-join, where one endpoint deleted the other. Here the two
|
||||
;; stop-when clauses do a similar job. Also, we can pull the
|
||||
;; `release-query-id` send up to an on-stop clause.
|
||||
(react (on-start
|
||||
(send! (dns-request query s server-ip))
|
||||
(send! (set-timer timeout-id (* (timeout) 1000) 'relative)))
|
||||
(on-stop
|
||||
(send! (list 'release-query-id query-id)))
|
||||
(stop-when (message (timer-expired timeout-id _))
|
||||
(log-debug "Timed out ~v ~v to ~v ~v after ~v seconds"
|
||||
q query-id
|
||||
zone-origin server-ip
|
||||
(timeout))
|
||||
(try-next-server))
|
||||
(stop-when (message (dns-reply
|
||||
(? (lambda (m) (= (dns-message-id m)
|
||||
(dns-message-id query)))
|
||||
$reply-message)
|
||||
$source
|
||||
s))
|
||||
;; TODO: maybe receive only specifically from the queried IP address?
|
||||
(log-debug "Answer to ~v from ~v ~v in ~v ms~n-- Answers: ~v~n-- Authorities: ~v~n-- Additional: ~v"
|
||||
q zone-origin server-ip
|
||||
(inexact->exact (round (- (current-inexact-milliseconds) start-time)))
|
||||
(dns-message-answers reply-message)
|
||||
(dns-message-authorities reply-message)
|
||||
(dns-message-additional reply-message))
|
||||
(on-answer (filter-dns-reply q reply-message zone-origin) server-ip))))
|
||||
|
||||
(try-next-server)))
|
||||
|
||||
(define ((dns-message-id-matches? expected) m)
|
||||
(= (dns-message-id m) expected))
|
||||
(: send-request : NetworkQueryState Nonnegative-Integer Natural UdpAddress
|
||||
-> (Transition NetworkQueryState))
|
||||
(define (send-request w query-id timeout server-ip)
|
||||
(match-define (network-request s q zone-origin _ _) (network-query-state-request w))
|
||||
(define query (make-dns-query-message q query-id))
|
||||
(define reply-wait-id (list s query-id 'reply-wait))
|
||||
(define timeout-id (list s query-id 'timeout))
|
||||
(define start-time (current-inexact-milliseconds))
|
||||
(log-debug (format "Sending ~v ~v to ~v ~v with ~v seconds of timeout"
|
||||
q query-id
|
||||
zone-origin server-ip
|
||||
timeout))
|
||||
(transition: w : NetworkQueryState
|
||||
(send-message (dns-request query s server-ip))
|
||||
(send-message (set-timer timeout-id (* timeout 1000) 'relative))
|
||||
;; TODO: Restore this to a "join" when proper pattern-unions are implemented
|
||||
(name-endpoint timeout-id
|
||||
(subscriber: NetworkQueryState (timer-expired-pattern timeout-id (wild))
|
||||
(match-state w
|
||||
(on-message
|
||||
[(timer-expired (== timeout-id) _)
|
||||
(begin
|
||||
(log-debug (format "Timed out ~v ~v to ~v ~v after ~v seconds"
|
||||
q query-id
|
||||
zone-origin server-ip
|
||||
timeout))
|
||||
(sequence-actions (try-next-server w)
|
||||
(delete-endpoint timeout-id)
|
||||
(delete-endpoint reply-wait-id)
|
||||
(send-message (list 'release-query-id query-id))))]))))
|
||||
(name-endpoint reply-wait-id
|
||||
(subscriber: NetworkQueryState (dns-reply-pattern (wild) (wild) s)
|
||||
(match-state w
|
||||
(on-message
|
||||
[(dns-reply reply-message source (== s))
|
||||
;; TODO: maybe receive only specifically from the queried IP address?
|
||||
(begin
|
||||
(log-debug
|
||||
(format
|
||||
"Answer to ~v from ~v ~v in ~v ms~n-- Answers: ~v~n-- Authorities: ~v~n-- Additional: ~v"
|
||||
q zone-origin server-ip
|
||||
(inexact->exact (round (- (current-inexact-milliseconds) start-time)))
|
||||
(dns-message-answers reply-message)
|
||||
(dns-message-authorities reply-message)
|
||||
(dns-message-additional reply-message)))
|
||||
(if (not (= (dns-message-id reply-message) (dns-message-id query)))
|
||||
(transition: w : NetworkQueryState)
|
||||
(sequence-actions (on-answer w
|
||||
(filter-dns-reply q reply-message zone-origin)
|
||||
server-ip)
|
||||
(delete-endpoint timeout-id)
|
||||
(delete-endpoint reply-wait-id)
|
||||
(send-message (list 'release-query-id query-id)))))]))))))
|
||||
|
|
|
|||
531
proxy.rkt
531
proxy.rkt
|
|
@ -1,4 +1,4 @@
|
|||
#lang racket/base
|
||||
#lang typed/racket/base
|
||||
;; DNS proxy using os-big-bang.rkt and os-udp.rkt.
|
||||
;;
|
||||
;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
|
||||
|
|
@ -28,10 +28,10 @@
|
|||
(require "zonedb.rkt")
|
||||
(require "network-query.rkt")
|
||||
(require "resolver.rkt")
|
||||
(require (except-in syndicate dataspace assert))
|
||||
(require syndicate/actor)
|
||||
(require syndicate/drivers/timer)
|
||||
(require syndicate/drivers/udp)
|
||||
(require marketplace/sugar-typed)
|
||||
(require marketplace/support/spy)
|
||||
(require marketplace/drivers/timer)
|
||||
(require marketplace/drivers/udp)
|
||||
(require "tk-dns.rkt")
|
||||
|
||||
(require racket/pretty)
|
||||
|
|
@ -40,262 +40,343 @@
|
|||
;; searches from. Performs recursive queries.
|
||||
|
||||
;; For discarding retransmitted requests that we're still working on.
|
||||
(struct active-request (source id) #:transparent)
|
||||
(struct: active-request ([source : UdpAddress] [id : Natural]) #:transparent)
|
||||
(define-type ActiveRequest active-request)
|
||||
|
||||
;; (: start-proxy : Natural CompiledZone CompiledZone -> Void)
|
||||
(: start-proxy : Natural CompiledZone CompiledZone -> Void)
|
||||
(define (start-proxy port-number zone roots-only)
|
||||
(define server-addr (udp-listener port-number))
|
||||
(define client-addr (udp-handle 'dns-client))
|
||||
|
||||
(log-info "Ready.")
|
||||
|
||||
(run-ground
|
||||
(spawn-timer-driver)
|
||||
(spawn-udp-driver)
|
||||
(dataspace #:name 'dns-vm
|
||||
(dns-spy)
|
||||
(spawn #:name 'timer-relay:dns
|
||||
(on (message (inbound ($ m (timer-expired _ _)))) (send! m))
|
||||
(on (message ($ m (set-timer _ _ _))) (send! (outbound m))))
|
||||
(query-id-allocator)
|
||||
(dns-read-driver server-addr)
|
||||
(dns-write-driver server-addr)
|
||||
(dns-read-driver client-addr)
|
||||
(dns-write-driver client-addr)
|
||||
(packet-dispatcher server-addr)
|
||||
(question-dispatcher zone roots-only client-addr)
|
||||
(forever))))
|
||||
(ground-vm:
|
||||
((inst generic-spy Void) 'UDP)
|
||||
((inst udp-driver Void))
|
||||
((inst timer-driver Void))
|
||||
(spawn-vm: : Void
|
||||
#:debug-name 'dns-vm
|
||||
(name-process 'dns-spy (spawn: #:parent : Void #:child : Void (dns-spy)))
|
||||
((inst timer-relay Void) 'timer-relay:dns)
|
||||
(name-process 'query-id-allocator (spawn: #:parent : Void #:child : (Setof Natural)
|
||||
(query-id-allocator)))
|
||||
(name-process 'server-dns-reader (spawn: #:parent : Void #:child : Void
|
||||
(dns-read-driver server-addr)))
|
||||
(name-process 'server-dns-writer (spawn: #:parent : Void #:child : Void
|
||||
(dns-write-driver server-addr)))
|
||||
(name-process 'client-dns-reader (spawn: #:parent : Void #:child : Void
|
||||
(dns-read-driver client-addr)))
|
||||
(name-process 'client-dns-writer (spawn: #:parent : Void #:child : Void
|
||||
(dns-write-driver client-addr)))
|
||||
(name-process 'packet-dispatcher (spawn: #:parent : Void
|
||||
#:child : (Setof ActiveRequest)
|
||||
(packet-dispatcher server-addr)))
|
||||
(name-process 'question-dispatcher (spawn: #:parent : Void
|
||||
#:child : CompiledZone
|
||||
(question-dispatcher zone
|
||||
roots-only
|
||||
client-addr))))))
|
||||
|
||||
;; (: query-id-allocator : -> Void)
|
||||
(: query-id-allocator : -> (Transition (Setof Natural)))
|
||||
(define (query-id-allocator)
|
||||
;; TODO: track how many are allocated and throttle requests if too
|
||||
;; many are in flight
|
||||
(spawn #:name 'query-id-allocator
|
||||
(field [allocated (set)])
|
||||
(on (message `(request ,$reply-addr allocate-query-id))
|
||||
(let recheck ()
|
||||
(define n (random 65536))
|
||||
(if (set-member? (allocated) n)
|
||||
(recheck)
|
||||
(begin (allocated (set-add (allocated) n))
|
||||
(send! `(reply ,reply-addr ,n))))))
|
||||
(on (message `(release-query-id ,(? exact-nonnegative-integer? $n)))
|
||||
(allocated (set-remove (allocated) n)))))
|
||||
(transition: ((inst set Natural)) : (Setof Natural) ;; all active query IDs
|
||||
(subscriber: (Setof Natural) `(request ,(wild) allocate-query-id)
|
||||
(match-state allocated
|
||||
(on-message
|
||||
[`(request ,reply-addr allocate-query-id)
|
||||
(let: recheck : (Transition (Setof Natural)) ()
|
||||
(define n (random 65536))
|
||||
(if (set-member? allocated n)
|
||||
(recheck)
|
||||
(transition: (set-add allocated n) : (Setof Natural)
|
||||
(send-message `(reply ,reply-addr ,n)))))])))
|
||||
(subscriber: (Setof Natural) `(release-query-id ,(wild))
|
||||
(match-state allocated
|
||||
(on-message
|
||||
[`(release-query-id ,(? exact-nonnegative-integer? n))
|
||||
(transition: (set-remove allocated n) : (Setof Natural))])))))
|
||||
|
||||
;; (: packet-dispatcher : UdpAddress -> Void)
|
||||
(: packet-dispatcher : UdpAddress -> (Transition (Setof ActiveRequest)))
|
||||
(define (packet-dispatcher s)
|
||||
(spawn #:name 'packet-dispatcher
|
||||
(field [old-active-requests (set)])
|
||||
(on (message ($ p (bad-dns-packet _ _ _ _)))
|
||||
(log-error "~a" (pretty-format p)))
|
||||
(on (message ($ r (dns-request $m $source s)))
|
||||
;; ^ We only listen for requests on our server socket
|
||||
(define req-id (active-request source (dns-message-id m)))
|
||||
;; TODO: when we have presence/error-handling, remove req-id
|
||||
;; from active requests once request-handler pseudothread exits.
|
||||
(when (not (set-member? (old-active-requests) req-id))
|
||||
;; ^ ignore retransmitted duplicates
|
||||
(old-active-requests (set-add (old-active-requests) req-id))
|
||||
(packet-relay req-id r)))
|
||||
(on (message ($ r (dns-reply $m s $sink)))
|
||||
(define req-id (active-request sink (dns-message-id m)))
|
||||
(old-active-requests (set-remove (old-active-requests) req-id)))))
|
||||
(transition: ((inst set ActiveRequest)) : (Setof ActiveRequest)
|
||||
(subscriber: (Setof ActiveRequest) (bad-dns-packet-pattern (wild) (wild) (wild) (wild))
|
||||
(on-message [p (begin (log-error (pretty-format p)) '())]))
|
||||
(subscriber: (Setof ActiveRequest) (dns-request-pattern (wild) (wild) s)
|
||||
(match-state old-active-requests
|
||||
(on-message
|
||||
[(and r (dns-request m source (== s)))
|
||||
;; ^ We only listen for requests on our server socket
|
||||
(let ((req-id (active-request source (dns-message-id m))))
|
||||
;; TODO: when we have presence/error-handling, remove req-id
|
||||
;; from active requests once request-handler pseudothread exits.
|
||||
(if (set-member? old-active-requests req-id)
|
||||
(transition: old-active-requests : (Setof ActiveRequest))
|
||||
;; ^ ignore retransmitted duplicates
|
||||
(transition: (set-add old-active-requests req-id) : (Setof ActiveRequest)
|
||||
(name-process (list 'packet-relay req-id)
|
||||
(spawn: #:parent : (Setof ActiveRequest)
|
||||
#:child : Void (packet-relay req-id r))))))])))
|
||||
(subscriber: (Setof ActiveRequest) (dns-reply-pattern (wild) s (wild))
|
||||
(match-state old-active-requests
|
||||
(on-message
|
||||
[(and r (dns-reply m (== s) sink))
|
||||
(let ((req-id (active-request sink (dns-message-id m))))
|
||||
(transition: (set-remove old-active-requests req-id) : (Setof ActiveRequest)))])))))
|
||||
|
||||
;; (: packet-relay : ActiveRequest DNSRequest -> Void)
|
||||
(: packet-relay : ActiveRequest DNSRequest -> (Transition Void))
|
||||
(define (packet-relay req-id request)
|
||||
(match-define (dns-request request-message request-source request-sink) request)
|
||||
|
||||
;; (: answer->reply : (Option Question) (Option CompleteAnswer) -> DNSReply)
|
||||
(: answer->reply : (Option Question) (Option CompleteAnswer) -> DNSReply)
|
||||
(define (answer->reply q a)
|
||||
(define-values (response-code ns us ds)
|
||||
(match a
|
||||
[#f
|
||||
(values 'name-error '() '() '())]
|
||||
[(complete-answer ns us ds)
|
||||
(values 'no-error (rr-set->list ns) (rr-set->list us) (rr-set->list ds))]))
|
||||
[#f
|
||||
(values 'name-error '() '() '())]
|
||||
[(complete-answer ns us ds)
|
||||
(values 'no-error (rr-set->list ns) (rr-set->list us) (rr-set->list ds))]))
|
||||
(dns-reply
|
||||
(dns-message (dns-message-id request-message)
|
||||
'response
|
||||
'query
|
||||
'non-authoritative
|
||||
'not-truncated
|
||||
(dns-message-recursion-desired request-message)
|
||||
'recursion-available
|
||||
response-code
|
||||
(if q (list q) '())
|
||||
ns
|
||||
us
|
||||
ds)
|
||||
'response
|
||||
'query
|
||||
'non-authoritative
|
||||
'not-truncated
|
||||
(dns-message-recursion-desired request-message)
|
||||
'recursion-available
|
||||
response-code
|
||||
(if q (list q) '())
|
||||
ns
|
||||
us
|
||||
ds)
|
||||
request-sink
|
||||
request-source))
|
||||
;; TODO: pay attention to recursion-desired flag
|
||||
(match (dns-message-questions request-message)
|
||||
['()
|
||||
;; No questions!
|
||||
(transition/no-state
|
||||
(send-message (answer->reply #f (empty-complete-answer))))]
|
||||
[(cons original-question _)
|
||||
;; At least one question
|
||||
(log-debug (format "Looking up ~v with query id ~v"
|
||||
original-question (dns-message-id request-message)))
|
||||
(transition/no-state
|
||||
(send-message original-question)
|
||||
(let-fresh (wait-id)
|
||||
(name-endpoint wait-id
|
||||
(subscriber: Void (answered-question-pattern original-question (wild))
|
||||
(on-message
|
||||
[(answered-question (== original-question) answer)
|
||||
(begin (log-debug (format "Final answer to ~v with query id ~v is ~v"
|
||||
original-question
|
||||
(dns-message-id request-message)
|
||||
answer))
|
||||
(list (delete-endpoint wait-id)
|
||||
(send-message (answer->reply original-question answer))))])))))]))
|
||||
|
||||
(spawn*
|
||||
#:name (list 'packet-relay req-id)
|
||||
|
||||
;; TODO: pay attention to recursion-desired flag
|
||||
(match (dns-message-questions request-message)
|
||||
['()
|
||||
;; No questions!
|
||||
(send! (answer->reply #f (empty-complete-answer)))]
|
||||
[(cons original-question _)
|
||||
;; At least one question
|
||||
(log-debug (format "Looking up ~v with query id ~v"
|
||||
original-question (dns-message-id request-message)))
|
||||
(send! original-question)
|
||||
(react (stop-when (message (answered-question original-question $answer))
|
||||
(log-debug "Final answer to ~v with query id ~v is ~v"
|
||||
original-question
|
||||
(dns-message-id request-message)
|
||||
answer)
|
||||
(send! (answer->reply original-question answer))))])))
|
||||
|
||||
;; (: glueless-question-handler : CompiledZone Question UdpAddress -> Void)
|
||||
(: glueless-question-handler : CompiledZone Question UdpAddress -> (Transition Void))
|
||||
(define (glueless-question-handler roots-only-zone q client-sock)
|
||||
;; Restart q, an overly-glueless question, from the roots.
|
||||
(define restarted-question (restart-question q))
|
||||
(spawn #:name (list 'glueless-question-handler q)
|
||||
(stop-when (message (answered-question restarted-question $ans))
|
||||
;; We got the answer to our restarted question; now transform
|
||||
;; it into an answer to the original question, to unblock the
|
||||
;; original questioner.
|
||||
(send! (answered-question q ans)))
|
||||
(on-start (question-handler roots-only-zone restarted-question client-sock))))
|
||||
(transition/no-state
|
||||
(let-fresh (relay)
|
||||
(name-endpoint relay
|
||||
(subscriber: Void (answered-question-pattern restarted-question (wild))
|
||||
(on-message
|
||||
[(answered-question (== restarted-question) ans)
|
||||
;; We got the answer to our restarted question; now transform
|
||||
;; it into an answer to the original question, to unblock the
|
||||
;; original questioner.
|
||||
(list (delete-endpoint relay)
|
||||
(send-message (answered-question q ans)))]))))
|
||||
(name-process (list 'glueless-question-handler-inner restarted-question)
|
||||
(spawn: #:parent : Void
|
||||
#:child : QHState
|
||||
(question-handler roots-only-zone restarted-question client-sock)))))
|
||||
|
||||
;; (: question-dispatcher : CompiledZone CompiledZone UdpAddress -> Void)
|
||||
(: question-dispatcher : CompiledZone CompiledZone UdpAddress -> (Transition CompiledZone))
|
||||
(define (question-dispatcher seed-zone roots-only client-sock)
|
||||
(: transition-and-set-timers : CompiledZone (Setof (Pairof DomainName Real))
|
||||
-> (Transition CompiledZone))
|
||||
(define (transition-and-set-timers new-zone timers)
|
||||
(transition: new-zone : CompiledZone
|
||||
(for/list: : (Listof (Action CompiledZone)) ([timerspec timers])
|
||||
(match-define (cons name ttl) timerspec)
|
||||
(send-message (set-timer (list 'check-dns-expiry name) (* ttl 1000) 'relative)))))
|
||||
(define-values (cleaned-seed-zone initial-timers) (zone-expire seed-zone))
|
||||
(spawn #:name 'question-dispatcher
|
||||
(field [zone cleaned-seed-zone])
|
||||
(on-start (set-timers! initial-timers))
|
||||
(sequence-actions (transition-and-set-timers cleaned-seed-zone initial-timers)
|
||||
;; TODO: consider deduping questions here too?
|
||||
(subscriber: CompiledZone `(debug-dump)
|
||||
(match-state zone
|
||||
(on-message
|
||||
[`(debug-dump)
|
||||
(begin
|
||||
(with-output-to-file "zone-proxy.zone"
|
||||
(lambda ()
|
||||
(write-bytes (bit-string->bytes (zone->bit-string zone))))
|
||||
#:mode 'binary
|
||||
#:exists 'replace)
|
||||
(with-output-to-file "zone-proxy.dump"
|
||||
(lambda ()
|
||||
(display "----------------------------------------------------------------------\n")
|
||||
(display (seconds->date (current-seconds)))
|
||||
(newline)
|
||||
(for: ([name (in-hash-keys zone)])
|
||||
(define rrmap (hash-ref zone name))
|
||||
(for: ([rr (in-hash-keys rrmap)])
|
||||
(define expiry (hash-ref rrmap rr))
|
||||
(write (list rr expiry))
|
||||
(newline)))
|
||||
(newline))
|
||||
#:mode 'text
|
||||
#:exists 'append)
|
||||
;; (with-output-to-file "zone-proxy.debug"
|
||||
;; (lambda ()
|
||||
;; (display "----------------------------------------------------------------------\n")
|
||||
;; (display (seconds->date (current-seconds)))
|
||||
;; (newline)
|
||||
;; (pretty-write current-ground-transition))
|
||||
;; #:mode 'text
|
||||
;; #:exists 'append)
|
||||
(transition: zone : CompiledZone))])))
|
||||
(subscriber: CompiledZone (question-pattern (wild) (wild) (wild) (wild))
|
||||
(match-state zone
|
||||
(on-message
|
||||
[(? question? q)
|
||||
(transition: zone : CompiledZone
|
||||
(cond
|
||||
[(question-cyclic? q)
|
||||
(log-warning (format "Cyclic question ~v" q))
|
||||
(send-message (answered-question q (empty-complete-answer)))]
|
||||
[(question-too-glueless? q)
|
||||
(log-warning (format "Overly-glueless question ~v" q))
|
||||
(name-process (list 'glueless-question-handler-outer q)
|
||||
(spawn: #:parent : CompiledZone
|
||||
#:child : Void
|
||||
(glueless-question-handler roots-only q client-sock)))]
|
||||
[else
|
||||
(name-process (list 'question-handler q)
|
||||
(spawn: #:parent : CompiledZone
|
||||
#:child : QHState
|
||||
(question-handler zone q client-sock)))]))])))
|
||||
(subscriber: CompiledZone (network-reply-pattern (wild) (wild))
|
||||
(match-state zone
|
||||
(on-message
|
||||
[(network-reply _ answer)
|
||||
(let-values (((new-zone timers) (incorporate-complete-answer answer zone #t)))
|
||||
(transition-and-set-timers new-zone timers))])))
|
||||
(subscriber: CompiledZone (timer-expired-pattern (list 'check-dns-expiry (wild)) (wild))
|
||||
(match-state zone
|
||||
(on-message
|
||||
[(timer-expired (list 'check-dns-expiry (? domain? name)) (? number? now-msec))
|
||||
(transition: (zone-expire-name zone name (/ now-msec 1000.0)) : CompiledZone)])))))
|
||||
|
||||
(define (set-timers! timers)
|
||||
(for/list ([timerspec timers])
|
||||
(match-define (cons name ttl) timerspec)
|
||||
(send! (set-timer (list 'check-dns-expiry name) (* ttl 1000) 'relative))))
|
||||
(struct: question-state ([zone : CompiledZone]
|
||||
[q : Question]
|
||||
[client-sock : UdpAddress]
|
||||
[nameservers-tried : (Setof DomainName)]
|
||||
[retry-count : Natural]) #:transparent)
|
||||
(define-type QuestionState question-state)
|
||||
|
||||
;; TODO: consider deduping questions here too?
|
||||
(struct: expanding-cnames ([q : Question]
|
||||
[accumulator : CompleteAnswer]
|
||||
[remaining-count : Integer]) #:transparent)
|
||||
(define-type ExpandingCNAMEs expanding-cnames)
|
||||
|
||||
(on (message `(debug-dump))
|
||||
(with-output-to-file "zone-proxy.zone"
|
||||
(lambda ()
|
||||
(write-bytes (bit-string->bytes (zone->bit-string (zone)))))
|
||||
#:mode 'binary
|
||||
#:exists 'replace)
|
||||
(with-output-to-file "zone-proxy.dump"
|
||||
(lambda ()
|
||||
(display "----------------------------------------------------------------------\n")
|
||||
(display (seconds->date (current-seconds)))
|
||||
(newline)
|
||||
(for ([name (in-hash-keys (zone))])
|
||||
(define rrmap (hash-ref (zone) name))
|
||||
(for ([rr (in-hash-keys rrmap)])
|
||||
(define expiry (hash-ref rrmap rr))
|
||||
(write (list rr expiry))
|
||||
(newline)))
|
||||
(newline))
|
||||
#:mode 'text
|
||||
#:exists 'append)
|
||||
;; (with-output-to-file "zone-proxy.debug"
|
||||
;; (lambda ()
|
||||
;; (display "----------------------------------------------------------------------\n")
|
||||
;; (display (seconds->date (current-seconds)))
|
||||
;; (newline)
|
||||
;; (pretty-write current-ground-transition))
|
||||
;; #:mode 'text
|
||||
;; #:exists 'append)
|
||||
)
|
||||
(define-type QHState (U QuestionState ExpandingCNAMEs))
|
||||
|
||||
(on (message ($ q (question _ _ _ _)))
|
||||
(cond
|
||||
[(question-cyclic? q)
|
||||
(log-warning (format "Cyclic question ~v" q))
|
||||
(send! (answered-question q (empty-complete-answer)))]
|
||||
[(question-too-glueless? q)
|
||||
(log-warning (format "Overly-glueless question ~v" q))
|
||||
(glueless-question-handler roots-only q client-sock)]
|
||||
[else
|
||||
(question-handler (zone) q client-sock)]))
|
||||
(: question-handler : CompiledZone Question UdpAddress -> (Transition QHState))
|
||||
(define (question-handler zone q client-sock)
|
||||
(retry-question (question-state zone q client-sock ((inst set DomainName)) 0)))
|
||||
|
||||
(on (message (network-reply _ $answer))
|
||||
(define-values (new-zone timers) (incorporate-complete-answer answer (zone) #t))
|
||||
(zone new-zone)
|
||||
(set-timers! timers))
|
||||
(: send-empty-reply : QHState Question -> (Transition QHState))
|
||||
(define (send-empty-reply w q)
|
||||
(transition w (send-message (answered-question q (empty-complete-answer)))))
|
||||
|
||||
(on (message (timer-expired (list 'check-dns-expiry (? domain? $name))
|
||||
(? number? $now-msec)))
|
||||
(zone (zone-expire-name (zone) name (/ now-msec 1000.0))))))
|
||||
|
||||
;; (: send-empty-reply! : Question -> Void)
|
||||
(define (send-empty-reply! q)
|
||||
(send! (answered-question q (empty-complete-answer))))
|
||||
|
||||
;; (: question-handler : CompiledZone Question UdpAddress -> Void)
|
||||
(define (question-handler zone0 q client-sock)
|
||||
(spawn*
|
||||
#:name (list 'question-handler q)
|
||||
(let retry-question ((zone zone0)
|
||||
(nameservers-tried (set))
|
||||
(retry-count 0))
|
||||
(if (= retry-count 20) ;; TODO: is this a sensible limit?
|
||||
;; Too many retries, i.e. too many referrals.
|
||||
(begin (log-error (format "Too many retries: ~v" q))
|
||||
(send-empty-reply! q))
|
||||
;; Credit remaining. Try once more (perhaps for the first time, in fact).
|
||||
(let ((resolution-result (resolve-from-zone q zone #f nameservers-tried)))
|
||||
(log-debug (format "Resolution result: ~v" resolution-result))
|
||||
|
||||
(match resolution-result
|
||||
[#f ;; We're not authoritative so this is just a signal that we can't answer usefully
|
||||
(send-empty-reply! q)]
|
||||
|
||||
[(referral zone-origin nameserver-rrs _)
|
||||
(define referral-id (gensym 'referral))
|
||||
(log-debug (format "Referral for ~v id ~v to ~v servers ~v"
|
||||
q referral-id (domain-labels zone-origin)
|
||||
(map domain-labels (set-map nameserver-rrs rr-rdata-domain-name))))
|
||||
(network-query client-sock
|
||||
q
|
||||
zone-origin
|
||||
(map rr-rdata-domain-name (set->list nameserver-rrs))
|
||||
referral-id)
|
||||
(react (stop-when
|
||||
(message (network-reply referral-id $ans))
|
||||
(cond [(not ans) ;; name-error/NXDOMAIN
|
||||
(send! (answered-question q #f))]
|
||||
[else
|
||||
(define-values (new-zone _ignored-timers)
|
||||
(incorporate-complete-answer ans zone #f))
|
||||
(when (log-level? (current-logger) 'debug)
|
||||
(log-debug "Referral ~v results in origin ~v:~n"
|
||||
referral-id zone-origin)
|
||||
(for ([k (set-union (list->set (hash-keys zone))
|
||||
(list->set (hash-keys new-zone)))]
|
||||
#:when (in-bailiwick? k zone-origin))
|
||||
(log-debug "Old ~v ~v~nNew ~v ~v"
|
||||
k (hash-ref zone k (lambda () 'missing))
|
||||
k (hash-ref new-zone k (lambda () 'missing))))
|
||||
(log-debug "=-=-=-=-=-="))
|
||||
(define nameserver-names
|
||||
(for/set ([rr nameserver-rrs]) (rr-rdata-domain-name rr)))
|
||||
(retry-question new-zone
|
||||
(set-union nameservers-tried nameserver-names)
|
||||
(+ retry-count 1))])))]
|
||||
|
||||
[(? complete-answer? ans)
|
||||
(send! (answered-question q ans))]
|
||||
|
||||
[(partial-answer base cnames)
|
||||
;; TODO: record chains of CNAMEs to avoid pathologically-long chains
|
||||
(react (field [acc base]
|
||||
[remaining (length cnames)])
|
||||
(on-start (for [(cname cnames)]
|
||||
(define cname-q (cname-question cname q))
|
||||
(react (on-start (send! cname-q))
|
||||
(stop-when (message (answered-question cname-q $ans))
|
||||
(acc (if ans (merge-answers (acc) ans) (acc)))
|
||||
(remaining (- (remaining) 1))))))
|
||||
(stop-when (rising-edge (zero? (remaining)))
|
||||
(send! (answered-question q (acc)))))]))))))
|
||||
(: retry-question : QHState -> (Transition QHState))
|
||||
(define (retry-question w)
|
||||
(match w
|
||||
[(question-state _ q _ _ 20) ;; TODO: is this a sensible limit?
|
||||
;; Too many retries, i.e. too many referrals.
|
||||
(log-error (format "Too many retries: ~v" w))
|
||||
(send-empty-reply w q)]
|
||||
[(question-state zone q client-sock nameservers-tried old-retry-count)
|
||||
;; Credit remaining. Try once more (perhaps for the first time, in fact).
|
||||
(define resolution-result (resolve-from-zone q zone #f nameservers-tried))
|
||||
(log-debug (format "Resolution result: ~v" resolution-result))
|
||||
(match resolution-result
|
||||
[#f ;; We're not authoritative so this is just a signal that we can't answer usefully
|
||||
(send-empty-reply w q)]
|
||||
[(referral zone-origin nameserver-rrs _)
|
||||
(define referral-id (gensym 'referral))
|
||||
(log-debug (format "Referral for ~v id ~v to ~v servers ~v"
|
||||
q referral-id (domain-labels zone-origin)
|
||||
(map domain-labels (set-map nameserver-rrs rr-rdata-domain-name))))
|
||||
(transition: w : QHState
|
||||
((inst network-query QHState) client-sock
|
||||
q
|
||||
zone-origin
|
||||
(map rr-rdata-domain-name (set->list nameserver-rrs))
|
||||
referral-id)
|
||||
(name-endpoint referral-id
|
||||
(subscriber: QHState (network-reply-pattern referral-id (wild))
|
||||
(match-state w
|
||||
(on-message
|
||||
[(network-reply (== referral-id) #f) ;; name-error/NXDOMAIN
|
||||
(transition: w : QHState
|
||||
(delete-endpoint referral-id)
|
||||
(send-message (answered-question q #f)))]
|
||||
[(network-reply (== referral-id) ans)
|
||||
(let-values (((new-zone ignored-timers)
|
||||
(incorporate-complete-answer ans zone #f)))
|
||||
(when (log-level? (current-logger) 'debug)
|
||||
(log-debug (format "Referral ~v results in origin ~v:~n"
|
||||
referral-id zone-origin))
|
||||
(for ([k (set-union (list->set (hash-keys zone))
|
||||
(list->set (hash-keys new-zone)))]
|
||||
#:when (in-bailiwick? k zone-origin))
|
||||
(log-debug (format "Old ~v ~v~nNew ~v ~v"
|
||||
k (hash-ref zone k (lambda () 'missing))
|
||||
k (hash-ref new-zone k (lambda () 'missing)))))
|
||||
(log-debug "=-=-=-=-=-="))
|
||||
(define nameserver-names
|
||||
(list->set
|
||||
(for/list: : (Listof DomainName)
|
||||
([rr nameserver-rrs])
|
||||
(rr-rdata-domain-name rr))))
|
||||
(sequence-actions
|
||||
(retry-question (struct-copy question-state w
|
||||
[nameservers-tried (set-union nameservers-tried
|
||||
nameserver-names)]
|
||||
[zone new-zone]
|
||||
[retry-count (+ old-retry-count 1)]))
|
||||
(delete-endpoint referral-id)))])))))]
|
||||
[(? complete-answer? ans)
|
||||
(transition: w : QHState (send-message (answered-question q ans)))]
|
||||
[(partial-answer base cnames)
|
||||
(transition: (expanding-cnames q base (length cnames)) : QHState
|
||||
((inst map (ActionTree QHState) DomainName)
|
||||
(lambda: ([cname : DomainName])
|
||||
;; TODO: record chains of CNAMEs to avoid pathologically-long chains
|
||||
(define cname-q (cname-question cname q))
|
||||
(list (send-message cname-q)
|
||||
(let-fresh (subscription-id)
|
||||
(name-endpoint subscription-id
|
||||
(subscriber: QHState (answered-question-pattern cname-q (wild))
|
||||
(match-state (expanding-cnames q acc remaining)
|
||||
(on-message
|
||||
[(answered-question (== cname-q) ans)
|
||||
(let ()
|
||||
(define new-acc (if ans (merge-answers acc ans) acc))
|
||||
(define new-remaining (- remaining 1))
|
||||
(define new-w (expanding-cnames q new-acc new-remaining))
|
||||
(transition: new-w : QHState
|
||||
(delete-endpoint subscription-id)
|
||||
(if (zero? new-remaining)
|
||||
(send-message (answered-question q new-acc))
|
||||
'())))])))))))
|
||||
cnames))])]))
|
||||
|
||||
(require "test-rrs.rkt")
|
||||
(require racket/file)
|
||||
|
|
|
|||
52
resolver.rkt
52
resolver.rkt
|
|
@ -1,4 +1,4 @@
|
|||
#lang racket/base
|
||||
#lang typed/racket/base
|
||||
;;
|
||||
;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
|
||||
;;;
|
||||
|
|
@ -27,8 +27,12 @@
|
|||
(require "codec.rkt")
|
||||
(require "zonedb.rkt")
|
||||
|
||||
(provide (struct-out partial-answer)
|
||||
(provide PartialAnswer
|
||||
Referral
|
||||
Answer
|
||||
(struct-out partial-answer)
|
||||
(struct-out referral)
|
||||
|
||||
resolve-from-zone)
|
||||
|
||||
;; Rules:
|
||||
|
|
@ -63,22 +67,27 @@
|
|||
;; -- a CompleteAnswer (a complete answer ready to send),
|
||||
;; -- #f (the domain name does not exist in the CompiledZone given),
|
||||
;; -- a Referral (a referral to some other nameserver).
|
||||
(define-type Answer (U CompleteAnswer PartialAnswer Referral #f))
|
||||
|
||||
;; A PartialAnswer is a (partial-answer CompleteAnswer ListOf<DomainName>)
|
||||
;; A collection of relevant RRs together with some CNAMEs that need expanding.
|
||||
(struct partial-answer (base cnames) #:transparent)
|
||||
(struct: partial-answer ([base : CompleteAnswer] [cnames : (Listof DomainName)]) #:transparent)
|
||||
(define-type PartialAnswer partial-answer)
|
||||
|
||||
;; A Referral is a (referral DomainName Set<RR> Set<RR>)
|
||||
(struct referral (zone-origin nameserver-rrs additional) #:transparent)
|
||||
(struct: referral ([zone-origin : DomainName]
|
||||
[nameserver-rrs : (Setof RR)]
|
||||
[additional : (Setof RR)]) #:transparent)
|
||||
(define-type Referral referral)
|
||||
|
||||
;; (: answer-from-zone : Question CompiledZone (Option RR) -> Answer)
|
||||
(: answer-from-zone : Question CompiledZone (Option RR) -> Answer)
|
||||
;; An answer of #f here does NOT indicate a missing domain-name
|
||||
;; (name-error/NXDOMAIN), but instead indicates that there are no
|
||||
;; records matching the query in the database given. It's up to the
|
||||
;; caller to decide what to do about that.
|
||||
(define (answer-from-zone q zone start-of-authority)
|
||||
(match-define (question name qtype qclass _) q)
|
||||
(define rrset (or (zone-ref zone name) (set)))
|
||||
(define: rrset : (Setof RR) (or (zone-ref zone name) (set)))
|
||||
(define filtered-rrs (filter-rrs rrset qtype qclass))
|
||||
(define cnames (filter-by-type rrset 'cname)) ;; TODO: filter by class too??
|
||||
(define answer-set (set-union cnames filtered-rrs))
|
||||
|
|
@ -96,9 +105,9 @@
|
|||
[else ;; Kick off the algorithm for CNAME expansion from RFC 1034 4.3.2 step 3a
|
||||
(partial-answer base (set-map cnames rr-rdata-domain-name))]))
|
||||
|
||||
;; (: closest-nameservers : DomainName CompiledZone -> (Setof RR))
|
||||
(: closest-nameservers : DomainName CompiledZone -> (Setof RR))
|
||||
(define (closest-nameservers name zone)
|
||||
(let search ((name name))
|
||||
(let: search ((name : (Option DomainName) name))
|
||||
(cond
|
||||
((not name)
|
||||
;; We've walked up the tree past the root. Give up.
|
||||
|
|
@ -115,44 +124,45 @@
|
|||
;; Remove a label and keep looking.
|
||||
(search (domain-parent name))))))
|
||||
|
||||
;; (: closest-untried-nameservers : Question CompiledZone (Setof DomainName) -> (Setof RR))
|
||||
(: closest-untried-nameservers : Question CompiledZone (Setof DomainName) -> (Setof RR))
|
||||
;; Returns a set of NS RRs in an arbitrary order.
|
||||
(define (closest-untried-nameservers q zone nameservers-tried)
|
||||
(define name (question-name q))
|
||||
(define name (question-repr-name q))
|
||||
(define ns-rrset (closest-nameservers name zone))
|
||||
(list->set
|
||||
(for/list ([rr ns-rrset] #:when (not (set-member? nameservers-tried (rr-rdata-domain-name rr))))
|
||||
rr)))
|
||||
(for/list: : (Listof RR) ([rr : RR ns-rrset]
|
||||
#:when (not (set-member? nameservers-tried (rr-rdata-domain-name rr))))
|
||||
rr)))
|
||||
|
||||
;; (: empty-answer : Question CompiledZone (Option RR) -> (Option CompleteAnswer))
|
||||
(: empty-answer : Question CompiledZone (Option RR) -> (Option CompleteAnswer))
|
||||
(define (empty-answer q zone start-of-authority)
|
||||
(if (and start-of-authority ;; we are authoritative for something
|
||||
(in-bailiwick? (question-name q) (rr-name start-of-authority))
|
||||
(in-bailiwick? (question-repr-name q) (rr-name start-of-authority))
|
||||
;; ^ for this in particular
|
||||
(not (zone-includes-name? zone (question-name q))))
|
||||
(not (zone-includes-name? zone (question-repr-name q))))
|
||||
;; ^ there are no RRs at all for this q
|
||||
;; NXDOMAIN/name-error: we definitely know there are no RRs at all for this q.
|
||||
#f
|
||||
;; A normal no-answers packet otherwise.
|
||||
(empty-complete-answer)))
|
||||
|
||||
;; (: additional-section/a : CompiledZone (Listof DomainName) -> (Setof RR))
|
||||
(: additional-section/a : CompiledZone (Listof DomainName) -> (Setof RR))
|
||||
;; Implements the "additional section" rules from RFC 1035 (and the
|
||||
;; rules for IPv6 from RFC 3596). Provides A and AAAA records for
|
||||
;; names mentioned in the "names" list that have entries in "zone".
|
||||
(define (additional-section/a zone names)
|
||||
;; RFC 3596 (section 3) requires that we process AAAA here as well
|
||||
;; as A.
|
||||
(foldl (lambda (name section)
|
||||
(foldl (lambda: ([name : DomainName] [section : (Setof RR)])
|
||||
(set-union section
|
||||
(set-filter (lambda (rr)
|
||||
(set-filter (lambda: ([rr : RR])
|
||||
(and (memv (rdata-type (rr-rdata rr)) '(a aaaa))
|
||||
(eqv? (rr-class rr) 'in)))
|
||||
(or (zone-ref zone name) (set)))))
|
||||
(set)
|
||||
(or (zone-ref zone name) ((inst set RR))))))
|
||||
((inst set RR))
|
||||
names))
|
||||
|
||||
;; (: resolve-from-zone : Question CompiledZone (Option RR) (Setof DomainName) -> Answer)
|
||||
(: resolve-from-zone : Question CompiledZone (Option RR) (Setof DomainName) -> Answer)
|
||||
(define (resolve-from-zone q zone start-of-authority nameservers-tried)
|
||||
(or (answer-from-zone q zone start-of-authority)
|
||||
(let ((best-nameservers (closest-untried-nameservers q zone nameservers-tried)))
|
||||
|
|
|
|||
94
test-dns.rkt
94
test-dns.rkt
|
|
@ -156,30 +156,30 @@
|
|||
'no-error
|
||||
(list (question (domain '(#"google" #"com")) '* 'in #f))
|
||||
(list
|
||||
(rr (domain '(#"google" #"com")) 'in 3119 (rdata-txt 'txt '(#"v=spf1 include:_netblocks.google.com ip4:216.73.93.70/31 ip4:216.73.93.72/31 ~all")))
|
||||
(rr (domain '(#"google" #"com")) 'in 285 (rdata-ipv4 'a '#(74 125 226 146)))
|
||||
(rr (domain '(#"google" #"com")) 'in 285 (rdata-ipv4 'a '#(74 125 226 148)))
|
||||
(rr (domain '(#"google" #"com")) 'in 285 (rdata-ipv4 'a '#(74 125 226 145)))
|
||||
(rr (domain '(#"google" #"com")) 'in 285 (rdata-ipv4 'a '#(74 125 226 147)))
|
||||
(rr (domain '(#"google" #"com")) 'in 285 (rdata-ipv4 'a '#(74 125 226 144)))
|
||||
(rr (domain '(#"google" #"com")) 'in 238877 (rdata-domain 'ns (domain '(#"ns2" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 238877 (rdata-domain 'ns (domain '(#"ns3" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 238877 (rdata-domain 'ns (domain '(#"ns1" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 238877 (rdata-domain 'ns (domain '(#"ns4" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 42 (rdata-mx 'mx 20 (domain '(#"alt1" #"aspmx" #"l" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 42 (rdata-mx 'mx 30 (domain '(#"alt2" #"aspmx" #"l" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 42 (rdata-mx 'mx 10 (domain '(#"aspmx" #"l" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 42 (rdata-mx 'mx 40 (domain '(#"alt3" #"aspmx" #"l" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 42 (rdata-mx 'mx 50 (domain '(#"alt4" #"aspmx" #"l" #"google" #"com")))))
|
||||
(rr (domain '(#"google" #"com")) 'txt 'in 3119 '(#"v=spf1 include:_netblocks.google.com ip4:216.73.93.70/31 ip4:216.73.93.72/31 ~all"))
|
||||
(rr (domain '(#"google" #"com")) 'a 'in 285 '#(74 125 226 146))
|
||||
(rr (domain '(#"google" #"com")) 'a 'in 285 '#(74 125 226 148))
|
||||
(rr (domain '(#"google" #"com")) 'a 'in 285 '#(74 125 226 145))
|
||||
(rr (domain '(#"google" #"com")) 'a 'in 285 '#(74 125 226 147))
|
||||
(rr (domain '(#"google" #"com")) 'a 'in 285 '#(74 125 226 144))
|
||||
(rr (domain '(#"google" #"com")) 'ns 'in 238877 (domain '(#"ns2" #"google" #"com")))
|
||||
(rr (domain '(#"google" #"com")) 'ns 'in 238877 (domain '(#"ns3" #"google" #"com")))
|
||||
(rr (domain '(#"google" #"com")) 'ns 'in 238877 (domain '(#"ns1" #"google" #"com")))
|
||||
(rr (domain '(#"google" #"com")) 'ns 'in 238877 (domain '(#"ns4" #"google" #"com")))
|
||||
(rr (domain '(#"google" #"com")) 'mx 'in 42 (mx 20 (domain '(#"alt1" #"aspmx" #"l" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'mx 'in 42 (mx 30 (domain '(#"alt2" #"aspmx" #"l" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'mx 'in 42 (mx 10 (domain '(#"aspmx" #"l" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'mx 'in 42 (mx 40 (domain '(#"alt3" #"aspmx" #"l" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'mx 'in 42 (mx 50 (domain '(#"alt4" #"aspmx" #"l" #"google" #"com")))))
|
||||
'()
|
||||
(list
|
||||
(rr (domain '(#"ns3" #"google" #"com")) 'in 238287 (rdata-ipv4 'a '#(216 239 36 10)))
|
||||
(rr (domain '(#"ns1" #"google" #"com")) 'in 238287 (rdata-ipv4 'a '#(216 239 32 10)))
|
||||
(rr (domain '(#"ns4" #"google" #"com")) 'in 238287 (rdata-ipv4 'a '#(216 239 38 10)))
|
||||
(rr (domain '(#"ns2" #"google" #"com")) 'in 238287 (rdata-ipv4 'a '#(216 239 34 10)))
|
||||
(rr (domain '(#"alt2" #"aspmx" #"l" #"google" #"com")) 'in 240 (rdata-ipv4 'a '#(74 125 39 27)))
|
||||
(rr (domain '(#"aspmx" #"l" #"google" #"com")) 'in 246 (rdata-ipv4 'a '#(74 125 115 27)))
|
||||
(rr (domain '(#"alt1" #"aspmx" #"l" #"google" #"com")) 'in 33 (rdata-ipv4 'a '#(74 125 77 27))))))
|
||||
(rr (domain '(#"ns3" #"google" #"com")) 'a 'in 238287 '#(216 239 36 10))
|
||||
(rr (domain '(#"ns1" #"google" #"com")) 'a 'in 238287 '#(216 239 32 10))
|
||||
(rr (domain '(#"ns4" #"google" #"com")) 'a 'in 238287 '#(216 239 38 10))
|
||||
(rr (domain '(#"ns2" #"google" #"com")) 'a 'in 238287 '#(216 239 34 10))
|
||||
(rr (domain '(#"alt2" #"aspmx" #"l" #"google" #"com")) 'a 'in 240 '#(74 125 39 27))
|
||||
(rr (domain '(#"aspmx" #"l" #"google" #"com")) 'a 'in 246 '#(74 125 115 27))
|
||||
(rr (domain '(#"alt1" #"aspmx" #"l" #"google" #"com")) 'a 'in 33 '#(74 125 77 27)))))
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
;; Roundtrip tests
|
||||
|
|
@ -271,7 +271,7 @@
|
|||
'no-error
|
||||
(list (question (domain '(#"google" #"com")) 'aaaa 'in #f))
|
||||
'()
|
||||
(list (rr (domain '(#"google" #"com")) 'in 594 (rdata-soa 'soa (domain '(#"ns1" #"google" #"com")) (domain '(#"dns-admin" #"google" #"com")) 1454883 7200 1800 1209600 300)))
|
||||
(list (rr (domain '(#"google" #"com")) 'soa 'in 594 (soa (domain '(#"ns1" #"google" #"com")) (domain '(#"dns-admin" #"google" #"com")) 1454883 7200 1800 1209600 300)))
|
||||
'()))
|
||||
|
||||
;; Wed Jun 29 21:05:03 2011 (4e0bcbbf): UDP: localhost sent 32 bytes:
|
||||
|
|
@ -318,7 +318,7 @@
|
|||
'no-recursion-available
|
||||
'no-error
|
||||
(list (question (domain '(#"www" #"google" #"com")) 'aaaa 'in #f))
|
||||
(list (rr (domain '(#"www" #"google" #"com")) 'in 604800 (rdata-domain 'cname (domain '(#"www" #"l" #"google" #"com")))))
|
||||
(list (rr (domain '(#"www" #"google" #"com")) 'cname 'in 604800 (domain '(#"www" #"l" #"google" #"com"))))
|
||||
'()
|
||||
'()))
|
||||
|
||||
|
|
@ -348,8 +348,8 @@
|
|||
'no-recursion-available
|
||||
'no-error
|
||||
(list (question (domain '(#"ipv6" #"google" #"com")) 'aaaa 'in #f))
|
||||
(list (rr (domain '(#"ipv6" #"google" #"com")) 'in 604800 (rdata-domain 'cname (domain '(#"ipv6" #"l" #"google" #"com"))))
|
||||
(rr (domain '(#"ipv6" #"l" #"google" #"com")) 'in 300 (rdata-ipv6 'aaaa '#(32 1 72 96 128 15 0 0 0 0 0 0 0 0 0 104))))
|
||||
(list (rr (domain '(#"ipv6" #"google" #"com")) 'cname 'in 604800 (domain '(#"ipv6" #"l" #"google" #"com")))
|
||||
(rr (domain '(#"ipv6" #"l" #"google" #"com")) 'aaaa 'in 300 '#(32 1 72 96 128 15 0 0 0 0 0 0 0 0 0 104)))
|
||||
'()
|
||||
'()))
|
||||
|
||||
|
|
@ -440,24 +440,24 @@
|
|||
'recursion-available
|
||||
'no-error
|
||||
(list (question X 'srv 'in #f))
|
||||
(list (rr X 'in 882 (rdata-srv 'srv 20 0 5269 (domain '(#"xmpp-server4" #"l" #"google" #"com"))))
|
||||
(rr X 'in 882 (rdata-srv 'srv 5 0 5269 (domain '(#"xmpp-server" #"l" #"google" #"com"))))
|
||||
(rr X 'in 882 (rdata-srv 'srv 20 0 5269 (domain '(#"xmpp-server1" #"l" #"google" #"com"))))
|
||||
(rr X 'in 882 (rdata-srv 'srv 20 0 5269 (domain '(#"xmpp-server2" #"l" #"google" #"com"))))
|
||||
(rr X 'in 882 (rdata-srv 'srv 20 0 5269 (domain '(#"xmpp-server3" #"l" #"google" #"com")))))
|
||||
(list (rr (domain '(#"google" #"com")) 'in 87076 (rdata-domain 'ns (domain '(#"ns3" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 87076 (rdata-domain 'ns (domain '(#"ns4" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 87076 (rdata-domain 'ns (domain '(#"ns2" #"google" #"com"))))
|
||||
(rr (domain '(#"google" #"com")) 'in 87076 (rdata-domain 'ns (domain '(#"ns1" #"google" #"com")))))
|
||||
(list (rr (domain '(#"xmpp-server" #"l" #"google" #"com")) 'in 282 (rdata-ipv4 'a '#(74 125 153 125)))
|
||||
(rr (domain '(#"xmpp-server1" #"l" #"google" #"com")) 'in 1782 (rdata-ipv4 'a '#(74 125 53 125)))
|
||||
(rr (domain '(#"xmpp-server2" #"l" #"google" #"com")) 'in 1782 (rdata-ipv4 'a '#(74 125 47 125)))
|
||||
(rr (domain '(#"xmpp-server3" #"l" #"google" #"com")) 'in 1782 (rdata-ipv4 'a '#(74 125 45 125)))
|
||||
(rr (domain '(#"xmpp-server4" #"l" #"google" #"com")) 'in 1782 (rdata-ipv4 'a '#(74 125 45 125)))
|
||||
(rr (domain '(#"ns1" #"google" #"com")) 'in 2737 (rdata-ipv4 'a '#(216 239 32 10)))
|
||||
(rr (domain '(#"ns2" #"google" #"com")) 'in 2737 (rdata-ipv4 'a '#(216 239 34 10)))
|
||||
(rr (domain '(#"ns3" #"google" #"com")) 'in 2737 (rdata-ipv4 'a '#(216 239 36 10)))
|
||||
(rr (domain '(#"ns4" #"google" #"com")) 'in 2737 (rdata-ipv4 'a '#(216 239 38 10)))))))
|
||||
(list (rr X 'srv 'in 882 (srv 20 0 5269 (domain '(#"xmpp-server4" #"l" #"google" #"com"))))
|
||||
(rr X 'srv 'in 882 (srv 5 0 5269 (domain '(#"xmpp-server" #"l" #"google" #"com"))))
|
||||
(rr X 'srv 'in 882 (srv 20 0 5269 (domain '(#"xmpp-server1" #"l" #"google" #"com"))))
|
||||
(rr X 'srv 'in 882 (srv 20 0 5269 (domain '(#"xmpp-server2" #"l" #"google" #"com"))))
|
||||
(rr X 'srv 'in 882 (srv 20 0 5269 (domain '(#"xmpp-server3" #"l" #"google" #"com")))))
|
||||
(list (rr (domain '(#"google" #"com")) 'ns 'in 87076 (domain '(#"ns3" #"google" #"com")))
|
||||
(rr (domain '(#"google" #"com")) 'ns 'in 87076 (domain '(#"ns4" #"google" #"com")))
|
||||
(rr (domain '(#"google" #"com")) 'ns 'in 87076 (domain '(#"ns2" #"google" #"com")))
|
||||
(rr (domain '(#"google" #"com")) 'ns 'in 87076 (domain '(#"ns1" #"google" #"com"))))
|
||||
(list (rr (domain '(#"xmpp-server" #"l" #"google" #"com")) 'a 'in 282 '#(74 125 153 125))
|
||||
(rr (domain '(#"xmpp-server1" #"l" #"google" #"com")) 'a 'in 1782 '#(74 125 53 125))
|
||||
(rr (domain '(#"xmpp-server2" #"l" #"google" #"com")) 'a 'in 1782 '#(74 125 47 125))
|
||||
(rr (domain '(#"xmpp-server3" #"l" #"google" #"com")) 'a 'in 1782 '#(74 125 45 125))
|
||||
(rr (domain '(#"xmpp-server4" #"l" #"google" #"com")) 'a 'in 1782 '#(74 125 45 125))
|
||||
(rr (domain '(#"ns1" #"google" #"com")) 'a 'in 2737 '#(216 239 32 10))
|
||||
(rr (domain '(#"ns2" #"google" #"com")) 'a 'in 2737 '#(216 239 34 10))
|
||||
(rr (domain '(#"ns3" #"google" #"com")) 'a 'in 2737 '#(216 239 36 10))
|
||||
(rr (domain '(#"ns4" #"google" #"com")) 'a 'in 2737 '#(216 239 38 10))))))
|
||||
|
||||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||||
;; Zone saving/loading.
|
||||
|
|
@ -473,9 +473,9 @@
|
|||
|
||||
(let ()
|
||||
(define rrs
|
||||
(list (rr (domain '(#"a")) 'in 30 (rdata-domain 'cname (domain '(#"b"))))
|
||||
(rr (domain '(#"b")) 'in 30 (rdata-domain 'cname (domain '(#"c"))))
|
||||
(rr (domain '(#"c")) 'in 30 (rdata-domain 'cname (domain '(#"d"))))))
|
||||
(list (rr (domain '(#"a")) 'cname 'in 30 (domain '(#"b")))
|
||||
(rr (domain '(#"b")) 'cname 'in 30 (domain '(#"c")))
|
||||
(rr (domain '(#"c")) 'cname 'in 30 (domain '(#"d")))))
|
||||
(define (check-transpose ns)
|
||||
(define permuted (map (lambda (i) (list-ref rrs i)) ns))
|
||||
(check-equal? (cname-sort permuted) rrs))
|
||||
|
|
|
|||
72
test-rrs.rkt
72
test-rrs.rkt
|
|
@ -1,4 +1,4 @@
|
|||
#lang racket/base
|
||||
#lang typed/racket/base
|
||||
;;
|
||||
;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
|
||||
;;;
|
||||
|
|
@ -33,16 +33,16 @@
|
|||
30
|
||||
10)))
|
||||
|
||||
;; (: A : (Listof Bytes) (Vector Integer Integer Integer Integer) -> RR)
|
||||
;; (: A/ttl : (Listof Bytes) (Vector Integer Integer Integer Integer) Nonnegative-Integer -> RR)
|
||||
;; (: MX : (Listof Bytes) Nonnegative-Integer (Listof Bytes) -> RR)
|
||||
;; (: CNAME : (Listof Bytes) (Listof Bytes) -> RR)
|
||||
;; (: NS : (Listof Bytes) (Listof Bytes) -> RR)
|
||||
;; (: NS/ttl : (Listof Bytes) (Listof Bytes) Nonnegative-Integer -> RR)
|
||||
;; (: TXT : (Listof Bytes) (Listof Bytes) -> RR)
|
||||
(: A : (Listof Bytes) (Vector Integer Integer Integer Integer) -> RR)
|
||||
(: A/ttl : (Listof Bytes) (Vector Integer Integer Integer Integer) Nonnegative-Integer -> RR)
|
||||
(: MX : (Listof Bytes) Nonnegative-Integer (Listof Bytes) -> RR)
|
||||
(: CNAME : (Listof Bytes) (Listof Bytes) -> RR)
|
||||
(: NS : (Listof Bytes) (Listof Bytes) -> RR)
|
||||
(: NS/ttl : (Listof Bytes) (Listof Bytes) Nonnegative-Integer -> RR)
|
||||
(: TXT : (Listof Bytes) (Listof Bytes) -> RR)
|
||||
|
||||
(define (A n ip) (A/ttl n ip 30))
|
||||
(define (A/ttl n ip ttl) (rr (domain n) 'in ttl (rdata-ipv4 'a ip)))
|
||||
(define (A/ttl n ip ttl) (rr (domain n) 'in ttl (rdata-ipv4 'a (cast ip IPv4))))
|
||||
(define (MX n p t) (rr (domain n) 'in 30 (rdata-mx 'mx p (domain t))))
|
||||
(define (CNAME n1 n2) (rr (domain n1) 'in 30 (rdata-domain 'cname (domain n2))))
|
||||
(define (NS n1 n2) (NS/ttl n1 n2 30))
|
||||
|
|
@ -62,38 +62,38 @@
|
|||
(A '(#"subns" #"example") '#(127 0 0 2))))
|
||||
|
||||
(define test-roots
|
||||
(list (NS/ttl '() '(#"a" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"b" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"c" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"d" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"e" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"f" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"g" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"h" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"i" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"j" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"k" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"l" #"root-servers" #"net") 518400)
|
||||
(NS/ttl '() '(#"m" #"root-servers" #"net") 518400)
|
||||
(A/ttl '(#"a" #"root-servers" #"net") '#(198 41 0 4) 518400)
|
||||
(A/ttl '(#"b" #"root-servers" #"net") '#(192 228 79 201) 518400)
|
||||
(A/ttl '(#"c" #"root-servers" #"net") '#(192 33 4 12) 518400)
|
||||
(A/ttl '(#"d" #"root-servers" #"net") '#(199 7 91 13) 518400)
|
||||
(A/ttl '(#"e" #"root-servers" #"net") '#(192 203 230 10) 518400)
|
||||
(A/ttl '(#"f" #"root-servers" #"net") '#(192 5 5 241) 518400)
|
||||
(A/ttl '(#"g" #"root-servers" #"net") '#(192 112 36 4) 518400)
|
||||
(A/ttl '(#"h" #"root-servers" #"net") '#(198 97 190 53) 518400)
|
||||
(A/ttl '(#"i" #"root-servers" #"net") '#(192 36 148 17) 518400)
|
||||
(A/ttl '(#"j" #"root-servers" #"net") '#(192 58 128 30) 518400)
|
||||
(A/ttl '(#"k" #"root-servers" #"net") '#(193 0 14 129) 518400)
|
||||
(A/ttl '(#"l" #"root-servers" #"net") '#(199 7 83 42) 518400)
|
||||
(A/ttl '(#"m" #"root-servers" #"net") '#(202 12 27 33) 518400)))
|
||||
(list (A/ttl '(#"a" #"root-servers" #"net") '#(198 41 0 4) 3600000)
|
||||
(A/ttl '(#"b" #"root-servers" #"net") '#(192 228 79 201) 3600000)
|
||||
(A/ttl '(#"c" #"root-servers" #"net") '#(192 33 4 12) 3600000)
|
||||
(A/ttl '(#"d" #"root-servers" #"net") '#(199 7 91 13) 3600000)
|
||||
(A/ttl '(#"e" #"root-servers" #"net") '#(192 203 230 10) 3600000)
|
||||
(A/ttl '(#"f" #"root-servers" #"net") '#(192 5 5 241) 3600000)
|
||||
(A/ttl '(#"g" #"root-servers" #"net") '#(192 112 36 4) 3600000)
|
||||
(A/ttl '(#"h" #"root-servers" #"net") '#(128 63 2 53) 3600000)
|
||||
(A/ttl '(#"i" #"root-servers" #"net") '#(192 36 148 17) 3600000)
|
||||
(A/ttl '(#"j" #"root-servers" #"net") '#(192 58 128 30) 3600000)
|
||||
(A/ttl '(#"k" #"root-servers" #"net") '#(193 0 14 129) 3600000)
|
||||
(A/ttl '(#"l" #"root-servers" #"net") '#(199 7 83 42) 3600000)
|
||||
(A/ttl '(#"m" #"root-servers" #"net") '#(202 12 27 33) 3600000)
|
||||
(NS/ttl '() '(#"a" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"b" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"c" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"d" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"e" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"f" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"g" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"h" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"i" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"j" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"k" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"l" #"root-servers" #"net") 3600000)
|
||||
(NS/ttl '() '(#"m" #"root-servers" #"net") 3600000)))
|
||||
|
||||
(define pathological-roots
|
||||
(list (NS '(#"a") '(#"ns" #"b"))
|
||||
(NS '(#"b") '(#"ns" #"a"))))
|
||||
|
||||
;; (: test-port-number : -> Nonnegative-Integer)
|
||||
(: test-port-number : -> Nonnegative-Integer)
|
||||
(define (test-port-number)
|
||||
(define p
|
||||
(string->number
|
||||
|
|
|
|||
135
tk-dns.rkt
135
tk-dns.rkt
|
|
@ -1,4 +1,4 @@
|
|||
#lang racket/base
|
||||
#lang typed/racket/base
|
||||
;; DNS drivers using marketplace.
|
||||
;;
|
||||
;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
|
||||
|
|
@ -22,55 +22,106 @@
|
|||
(require racket/set)
|
||||
(require racket/match)
|
||||
(require "codec.rkt")
|
||||
(require syndicate/actor)
|
||||
(require syndicate/protocol/standard-relay)
|
||||
(require syndicate/drivers/udp)
|
||||
(require marketplace/sugar-typed)
|
||||
(require marketplace/drivers/udp)
|
||||
(require marketplace/support/pseudo-substruct)
|
||||
|
||||
(provide (struct-out bad-dns-packet-repr)
|
||||
BadDnsPacket bad-dns-packet bad-dns-packet?
|
||||
BadDnsPacketPattern bad-dns-packet-pattern bad-dns-packet-pattern?
|
||||
|
||||
(struct-out dns-request-repr)
|
||||
DNSRequest dns-request dns-request?
|
||||
DNSRequestPattern dns-request-pattern dns-request-pattern?
|
||||
|
||||
(struct-out dns-reply-repr)
|
||||
DNSReply dns-reply dns-reply?
|
||||
DNSReplyPattern dns-reply-pattern dns-reply-pattern?
|
||||
|
||||
(provide (struct-out bad-dns-packet)
|
||||
(struct-out dns-request)
|
||||
(struct-out dns-reply)
|
||||
dns-read-driver
|
||||
dns-write-driver
|
||||
dns-spy)
|
||||
|
||||
(struct bad-dns-packet (detail source sink reason) #:transparent)
|
||||
(struct dns-request (message source sink) #:transparent)
|
||||
(struct dns-reply (message source sink) #:transparent)
|
||||
(struct: (TDetail TSource TSink TReason)
|
||||
bad-dns-packet-repr
|
||||
([detail : TDetail] [source : TSource] [sink : TSink] [reason : TReason]) #:transparent)
|
||||
(pseudo-substruct: (bad-dns-packet-repr Any UdpAddress UdpAddress Symbol)
|
||||
BadDnsPacket bad-dns-packet bad-dns-packet?)
|
||||
(pseudo-substruct: (bad-dns-packet-repr Any
|
||||
(U Wild UdpAddressPattern)
|
||||
(U Wild UdpAddressPattern)
|
||||
(U Wild Symbol))
|
||||
BadDnsPacketPattern bad-dns-packet-pattern bad-dns-packet-pattern?)
|
||||
|
||||
(struct: (TMessage TSource TSink)
|
||||
dns-request-repr
|
||||
([message : TMessage] [source : TSource] [sink : TSink]) #:transparent)
|
||||
(pseudo-substruct: (dns-request-repr DNSMessage UdpAddress UdpAddress)
|
||||
DNSRequest dns-request dns-request?)
|
||||
(pseudo-substruct: (dns-request-repr (U Wild DNSMessage)
|
||||
(U Wild UdpAddressPattern)
|
||||
(U Wild UdpAddressPattern))
|
||||
DNSRequestPattern dns-request-pattern dns-request-pattern?)
|
||||
|
||||
(struct: (TMessage TSource TSink)
|
||||
dns-reply-repr
|
||||
([message : TMessage] [source : TSource] [sink : TSink]) #:transparent)
|
||||
(pseudo-substruct: (dns-reply-repr DNSMessage UdpAddress UdpAddress)
|
||||
DNSReply dns-reply dns-reply?)
|
||||
(pseudo-substruct: (dns-reply-repr (U Wild DNSMessage)
|
||||
(U Wild UdpAddressPattern)
|
||||
(U Wild UdpAddressPattern))
|
||||
DNSReplyPattern dns-reply-pattern dns-reply-pattern?)
|
||||
|
||||
(: dns-read-driver : UdpAddress -> (Transition Void))
|
||||
(define (dns-read-driver s)
|
||||
(spawn
|
||||
#:name (list 'dns-read-driver s)
|
||||
(on (message (inbound (udp-packet $source s #"")))
|
||||
(log-info "Debug dump packet received")
|
||||
(send! `(debug-dump)))
|
||||
(on (message (inbound (udp-packet $source s $body)))
|
||||
(when (positive? (bytes-length body))
|
||||
(send!
|
||||
(with-handlers ((exn:fail? (lambda (e)
|
||||
(bad-dns-packet body source s 'unparseable))))
|
||||
(define message (packet->dns-message body))
|
||||
(case (dns-message-direction message)
|
||||
((request) (dns-request message source s))
|
||||
((response) (dns-reply message source s)))))))))
|
||||
|
||||
(define (translate message s sink)
|
||||
(with-handlers ((exn:fail? (lambda (e) (bad-dns-packet message s sink 'unencodable))))
|
||||
(outbound (udp-packet s sink (dns-message->packet message)))))
|
||||
(transition: (void) : Void
|
||||
(at-meta-level: Void
|
||||
(subscriber: Void (udp-packet-pattern (wild) s (wild))
|
||||
(on-message
|
||||
[(udp-packet source (== s) #"")
|
||||
(begin (log-info "Debug dump packet received")
|
||||
(send-message `(debug-dump)))]
|
||||
[(udp-packet source (== s) body)
|
||||
(send-message
|
||||
(with-handlers ((exn:fail? (lambda (e)
|
||||
(bad-dns-packet body source s 'unparseable))))
|
||||
(define message (packet->dns-message body))
|
||||
(case (dns-message-direction message)
|
||||
((request) (dns-request message source s))
|
||||
((response) (dns-reply message source s)))))])))))
|
||||
|
||||
(: dns-write-driver : UdpAddress -> (Transition Void))
|
||||
(define (dns-write-driver s)
|
||||
(spawn #:name (list 'dns-write-driver s)
|
||||
(on (message (dns-request $message s $sink))
|
||||
(send! (translate message s sink)))
|
||||
(on (message (dns-reply $message s $sink))
|
||||
(send! (translate message s sink)))))
|
||||
(: translate : DNSMessage UdpAddress -> (ActionTree Void))
|
||||
(define (translate message sink)
|
||||
(with-handlers ((exn:fail? (lambda (e)
|
||||
(send-message (bad-dns-packet message s sink 'unencodable)))))
|
||||
(at-meta-level: Void
|
||||
(send-message (udp-packet s sink (dns-message->packet message))))))
|
||||
(transition: (void) : Void
|
||||
(subscriber: Void (dns-request-pattern (wild) s (wild))
|
||||
(on-message
|
||||
[(dns-request message (== s) sink) (translate message sink)]))
|
||||
(subscriber: Void (dns-reply-pattern (wild) s (wild))
|
||||
(on-message
|
||||
[(dns-reply message (== s) sink) (translate message sink)]))))
|
||||
|
||||
(: dns-spy : -> (Transition Void))
|
||||
(define (dns-spy)
|
||||
(spawn #:name 'dns-spy
|
||||
(on (message (dns-request $message $source $sink))
|
||||
(log-info (format "DNS: ~v asks ~v ~v~n : ~v"
|
||||
source sink (dns-message-id message)
|
||||
(dns-message-questions message))))
|
||||
(on (message (dns-reply $message $source $sink))
|
||||
(log-info (format "DNS: ~v answers ~v~n : ~v"
|
||||
source sink
|
||||
message)))))
|
||||
(transition: (void) : Void
|
||||
(observe-publishers: Void (wild)
|
||||
(on-message
|
||||
[(dns-request message source sink)
|
||||
(begin (log-info (format "DNS: ~v asks ~v ~v~n : ~v"
|
||||
source sink (dns-message-id message)
|
||||
(dns-message-questions message)))
|
||||
(void))]
|
||||
[(dns-reply message source sink)
|
||||
(begin (log-info (format "DNS: ~v answers ~v~n : ~v"
|
||||
source sink
|
||||
message))
|
||||
(void))]
|
||||
[x
|
||||
(begin (log-info (format "DNS: ~v" x))
|
||||
(void))]))))
|
||||
|
|
|
|||
102
zonedb.rkt
102
zonedb.rkt
|
|
@ -1,4 +1,4 @@
|
|||
#lang racket/base
|
||||
#lang typed/racket/base
|
||||
;; Noddy representation of a zone, and various zone and RRSet utilities.
|
||||
;;
|
||||
;;; Copyright 2010, 2011, 2012, 2013 Tony Garnock-Jones <tonyg@ccs.neu.edu>
|
||||
|
|
@ -25,8 +25,10 @@
|
|||
(require "api.rkt")
|
||||
(require "codec.rkt")
|
||||
(require bitsyntax)
|
||||
(require (rename-in marketplace/tr-struct-copy [tr-struct-copy struct-copy])) ;; PR13149
|
||||
|
||||
(provide zone-ref
|
||||
(provide CompiledZone
|
||||
zone-ref
|
||||
zone-includes-name?
|
||||
incorporate-complete-answer
|
||||
zone-expire-name
|
||||
|
|
@ -43,47 +45,52 @@
|
|||
zone->bit-string
|
||||
bit-string->zone)
|
||||
|
||||
;; (define-type RelativeSeconds Real)
|
||||
;; (define-type AbsoluteSeconds Real)
|
||||
;; (define-predicate absolute-seconds? AbsoluteSeconds)
|
||||
(define absolute-seconds? real?)
|
||||
(define-type RelativeSeconds Real)
|
||||
(define-type AbsoluteSeconds Real)
|
||||
(define-predicate absolute-seconds? AbsoluteSeconds)
|
||||
|
||||
;; An InfiniteLifetime is an (infinite-lifetime RelativeSeconds), a
|
||||
;; specification of the TTL to use when sending a non-expiring RR to a
|
||||
;; peer.
|
||||
(struct infinite-lifetime (ttl) #:transparent)
|
||||
(struct: infinite-lifetime ([ttl : RelativeSeconds]) #:transparent)
|
||||
(define-type InfiniteLifetime infinite-lifetime)
|
||||
|
||||
;; An Expiry is either an AbsoluteSeconds or an InfiniteLifetime.
|
||||
(define-type Expiry (U AbsoluteSeconds InfiniteLifetime))
|
||||
|
||||
;; A CompiledZone is a Hash<DomainName,Hash<RR,(or AbsoluteSeconds
|
||||
;; InfiniteLifetime)>>, representing a collection of DNS RRSets
|
||||
;; indexed by DomainName. Each RR in an RRSet either has an expiry
|
||||
;; time associated with it or has an InfiniteLifetime associated with
|
||||
;; it, in which case it should not expire.
|
||||
(define-type CompiledZone (HashTable DomainName (HashTable RR Expiry)))
|
||||
|
||||
;; A Timers is a SetOf<(cons DomainName RelativeSeconds)>,
|
||||
;; representing a collection of timeouts that should be set against
|
||||
;; names to to see if their associated RRs have expired.
|
||||
(define-type Timer (Pairof DomainName RelativeSeconds))
|
||||
(define-type Timers (Setof Timer))
|
||||
|
||||
;; TODO: maybe store domain names big-end first? It'd make bailiwick
|
||||
;; and subzone checks into prefix rather than suffix checks. It makes
|
||||
;; domain names into paths through the DNS DB tree.
|
||||
|
||||
;; (: current-inexact-seconds : -> AbsoluteSeconds)
|
||||
(: current-inexact-seconds : -> AbsoluteSeconds)
|
||||
(define (current-inexact-seconds)
|
||||
(/ (current-inexact-milliseconds) 1000.0))
|
||||
|
||||
;; (: still-valid? : Expiry AbsoluteSeconds -> Boolean)
|
||||
(: still-valid? : Expiry AbsoluteSeconds -> Boolean)
|
||||
(define (still-valid? expiry now)
|
||||
(or (infinite-lifetime? expiry)
|
||||
(>= expiry now)))
|
||||
|
||||
;; (: zone-ref : CompiledZone DomainName -> (Option (Setof RR)))
|
||||
(: zone-ref : CompiledZone DomainName -> (Option (Setof RR)))
|
||||
(define (zone-ref db name)
|
||||
(define expirymap (hash-ref db name (lambda () #f)))
|
||||
(and expirymap
|
||||
(let ((now (current-inexact-seconds)))
|
||||
(for/fold ([acc (set)]) ([resource (in-hash-keys expirymap)])
|
||||
(for/fold: ([acc : (Setof RR) (set)])
|
||||
([resource : RR (in-hash-keys expirymap)])
|
||||
(define expiry (hash-ref expirymap resource))
|
||||
(if (still-valid? expiry now)
|
||||
(let ((new-ttl (if (infinite-lifetime? expiry)
|
||||
|
|
@ -91,14 +98,14 @@
|
|||
(- expiry now))))
|
||||
(set-add acc
|
||||
(struct-copy rr resource
|
||||
[ttl (exact-floor new-ttl)])))
|
||||
[ttl (cast (exact-floor new-ttl) Nonnegative-Integer)])))
|
||||
acc)))))
|
||||
|
||||
;; (: zone-includes-name? : CompiledZone DomainName -> Boolean)
|
||||
(: zone-includes-name? : CompiledZone DomainName -> Boolean)
|
||||
(define (zone-includes-name? db name)
|
||||
(hash-has-key? db name))
|
||||
|
||||
;; (: incorporate-rr : (Option AbsoluteSeconds) -> (RR CompiledZone -> CompiledZone))
|
||||
(: incorporate-rr : (Option AbsoluteSeconds) -> (RR CompiledZone -> CompiledZone))
|
||||
;; Incorporates the given RR into our database. If base-time is a
|
||||
;; number of seconds, we treat the RR as having a TTL that decreases
|
||||
;; as time goes by; otherwise base-time is #f, and we treat the RR as
|
||||
|
|
@ -122,7 +129,7 @@
|
|||
(infinite-lifetime (rr-ttl resource0))))
|
||||
(define resource (struct-copy rr resource0 [ttl 0]))
|
||||
(define name (rr-name resource))
|
||||
(define old-expirymap (hash-ref db name (lambda () #hash())))
|
||||
(define old-expirymap (hash-ref db name (lambda () (ann #hash() (HashTable rr Expiry)))))
|
||||
(define old-expiry (hash-ref old-expirymap resource (lambda () 0)))
|
||||
(cond
|
||||
[(infinite-lifetime? old-expiry) ;; don't update TTL: the existing record should live forever
|
||||
|
|
@ -132,15 +139,15 @@
|
|||
[else ;; old record finite-lifetime but expiring after the new expiry: leave it alone
|
||||
db]))
|
||||
|
||||
;; (: incorporate-complete-answer :
|
||||
;; (Option CompleteAnswer) CompiledZone Boolean -> (Values CompiledZone Timers))
|
||||
(: incorporate-complete-answer :
|
||||
(Option CompleteAnswer) CompiledZone Boolean -> (Values CompiledZone Timers))
|
||||
(define (incorporate-complete-answer ans db is-cache?)
|
||||
(match ans
|
||||
[#f
|
||||
(values db (set))]
|
||||
[(complete-answer ns us ds)
|
||||
(define now (current-inexact-seconds))
|
||||
(for/fold ([db db] [timers (set)])
|
||||
(for/fold ([db db] [timers ((inst set Timer))])
|
||||
([rr (in-list (append (set->list ns)
|
||||
(set->list us)
|
||||
(set->list ds)))]) ;; no in-sequences in typed racket
|
||||
|
|
@ -149,14 +156,15 @@
|
|||
(values ((incorporate-rr now) rr db)
|
||||
(set-add timers (cons (rr-name rr) (rr-ttl rr))))))]))
|
||||
|
||||
;; (: zone-expire-name : CompiledZone DomainName AbsoluteSeconds -> CompiledZone)
|
||||
(: zone-expire-name : CompiledZone DomainName AbsoluteSeconds -> CompiledZone)
|
||||
;; Checks the given name to see if there are any expiring records, and
|
||||
;; if so, removes them.
|
||||
(define (zone-expire-name db name now-seconds)
|
||||
(define empty-expirymap #hash())
|
||||
(define empty-expirymap (ann #hash() (HashTable RR Expiry)))
|
||||
(define old-expirymap (hash-ref db name (lambda () empty-expirymap)))
|
||||
(define new-expirymap
|
||||
(for/fold ([acc empty-expirymap]) ([resource (in-hash-keys old-expirymap)])
|
||||
(for/fold: ([acc : (HashTable RR Expiry) empty-expirymap])
|
||||
([resource : RR (in-hash-keys old-expirymap)])
|
||||
(define expiry (hash-ref old-expirymap resource))
|
||||
(if (still-valid? expiry now-seconds)
|
||||
(hash-set acc resource expiry)
|
||||
|
|
@ -165,33 +173,33 @@
|
|||
(hash-remove db name)
|
||||
(hash-set db name new-expirymap)))
|
||||
|
||||
;; (: zone-expire : CompiledZone -> (Values CompiledZone Timers))
|
||||
(: zone-expire : CompiledZone -> (Values CompiledZone Timers))
|
||||
;; Used to freshen a saved zone when it is loaded from disk.
|
||||
(define (zone-expire zone)
|
||||
(define now-seconds (current-inexact-seconds))
|
||||
(for/fold ([zone zone] [timers (set)])
|
||||
([name (in-hash-keys zone)])
|
||||
(for/fold: ([zone : CompiledZone zone] [timers : Timers (set)])
|
||||
([name : DomainName (in-hash-keys zone)])
|
||||
(define new-zone (zone-expire-name zone name now-seconds))
|
||||
(define expirymap (hash-ref new-zone name (lambda () #f)))
|
||||
(values new-zone
|
||||
(if expirymap
|
||||
(set-union (list->set
|
||||
(map (lambda (e) (cons name (- e now-seconds)))
|
||||
(map (lambda: ([e : AbsoluteSeconds]) (cons name (- e now-seconds)))
|
||||
(filter absolute-seconds? (hash-values expirymap))))
|
||||
timers)
|
||||
timers))))
|
||||
|
||||
;; (: empty-zone-db : -> CompiledZone)
|
||||
(: empty-zone-db : -> CompiledZone)
|
||||
(define (empty-zone-db)
|
||||
(make-immutable-hash))
|
||||
|
||||
;; (: compile-zone-db : (Listof RR) -> CompiledZone)
|
||||
(: compile-zone-db : (Listof RR) -> CompiledZone)
|
||||
;; Builds an immutable hash table from the given RRs, suitable for
|
||||
;; quickly looking up answers to queries.
|
||||
(define (compile-zone-db rrs)
|
||||
(foldl (incorporate-rr #f) (empty-zone-db) rrs))
|
||||
|
||||
;; (: in-bailiwick? : DomainName DomainName -> Boolean)
|
||||
(: in-bailiwick? : DomainName DomainName -> Boolean)
|
||||
;; Answers #t iff dn falls within the bailiwick of the zone with
|
||||
;; origin o.
|
||||
(define (in-bailiwick? dn o)
|
||||
|
|
@ -199,23 +207,23 @@
|
|||
(let ((p (domain-parent dn)))
|
||||
(and p (in-bailiwick? p o)))))
|
||||
|
||||
;; (: set-filter : (All (X) (X -> Boolean) (Setof X) -> (Setof X)))
|
||||
(: set-filter : (All (X) (X -> Boolean) (Setof X) -> (Setof X)))
|
||||
;; Retains only those elements of its argument for which the predicate
|
||||
;; answers #t.
|
||||
(define (set-filter predicate in)
|
||||
(for/fold ([acc (set)]) ([x (in-list (set->list in))])
|
||||
(for/fold: ([acc : (Setof X) (set)]) ([x : X (in-list (set->list in))])
|
||||
(if (predicate x) (set-add acc x) acc)))
|
||||
|
||||
;; (: filter-by-type : (Setof RR) RRType -> (Setof RR))
|
||||
(: filter-by-type : (Setof RR) RRType -> (Setof RR))
|
||||
;; Selects only those members of rrset having rr-type type.
|
||||
(define (filter-by-type rrset type)
|
||||
(define p? (rdata-type-pred type))
|
||||
(set-filter (lambda (rr) (p? (rr-rdata rr))) rrset))
|
||||
(set-filter (lambda: ([rr : RR]) (p? (rr-rdata rr))) rrset))
|
||||
|
||||
;; (: no-rrs : (Setof RR))
|
||||
(: no-rrs : (Setof RR))
|
||||
(define no-rrs (set))
|
||||
|
||||
;; (: filter-rrs : (Setof RR) QueryType QueryClass -> (Setof RR))
|
||||
(: filter-rrs : (Setof RR) QueryType QueryClass -> (Setof RR))
|
||||
;; Returns a set like its argument with RRs not matching the given
|
||||
;; type and class removed.
|
||||
(define (filter-rrs rrs qtype qclass)
|
||||
|
|
@ -229,10 +237,10 @@
|
|||
(define filtered-by-type-and-class
|
||||
(case qclass
|
||||
((*) filtered-by-type)
|
||||
(else (set-filter (lambda (rr) (eqv? (rr-class rr) qclass)) filtered-by-type))))
|
||||
(else (set-filter (lambda: ([rr : RR]) (eqv? (rr-class rr) qclass)) filtered-by-type))))
|
||||
filtered-by-type-and-class)
|
||||
|
||||
;; (: rr-set->list : (Setof RR) -> (Listof RR))
|
||||
(: rr-set->list : (Setof RR) -> (Listof RR))
|
||||
;; Like set->list, but places all CNAME records first.
|
||||
;; This is apparently to work around bugs in old versions of BIND?
|
||||
;;
|
||||
|
|
@ -256,11 +264,11 @@
|
|||
(append (cname-sort (set->list cnames))
|
||||
(set->list (set-subtract rrs cnames))))
|
||||
|
||||
;; (: rr-rdata-domain-name : RR -> DomainName)
|
||||
(: rr-rdata-domain-name : RR -> DomainName)
|
||||
(define (rr-rdata-domain-name rr)
|
||||
(rdata-domain-name (rr-rdata rr)))
|
||||
(rdata-domain-name (cast (rr-rdata rr) rdata-domain)))
|
||||
|
||||
;; (: cname-sort : (Listof RR) -> (Listof RR))
|
||||
(: cname-sort : (Listof RR) -> (Listof RR))
|
||||
;; Produce an ordering of the CNAMEs given that respects their
|
||||
;; "causality". For example, if a CNAME b and b CNAME c, then the RRs
|
||||
;; will be presented in that order (and not the other order, with b
|
||||
|
|
@ -269,9 +277,11 @@
|
|||
(define lhss (list->set (map rr-name cnames)))
|
||||
(define rhss (list->set (map rr-rdata-domain-name cnames)))
|
||||
(define roots (set->list (set-subtract lhss rhss))) ;; Nodes not the targets of some edge.
|
||||
;; (: targets-of : DomainName -> (Listof RR))
|
||||
(define (targets-of name) (filter (lambda (rr) (equal? (rr-name rr) name)) cnames))
|
||||
(let iterate ((remaining roots) (seen (set)) (acc '()))
|
||||
(: targets-of : DomainName -> (Listof RR))
|
||||
(define (targets-of name) (filter (lambda: ([rr : RR]) (equal? (rr-name rr) name)) cnames))
|
||||
(let: iterate ((remaining : (Listof DomainName) roots)
|
||||
(seen : (Setof DomainName) (set))
|
||||
(acc : (Listof RR) '()))
|
||||
(if (null? remaining)
|
||||
(reverse acc)
|
||||
(let ((source (car remaining)))
|
||||
|
|
@ -283,12 +293,12 @@
|
|||
(set-add seen source)
|
||||
(append rrs acc))))))))
|
||||
|
||||
;; (: zone->bit-string : CompiledZone -> BitString)
|
||||
(: zone->bit-string : CompiledZone -> BitString)
|
||||
;; Produces a serialized form of the zone suitable for saving to disk.
|
||||
(define (zone->bit-string zone)
|
||||
(for/fold ([acc (bit-string)]) ([name (in-hash-keys zone)])
|
||||
(for/fold: ([acc : BitString (bit-string)]) ([name : DomainName (in-hash-keys zone)])
|
||||
(define rrmap (hash-ref zone name))
|
||||
(for/fold ([acc acc]) ([rr (in-hash-keys rrmap)])
|
||||
(for/fold: ([acc : BitString acc]) ([rr : RR (in-hash-keys rrmap)])
|
||||
(define expiry (hash-ref rrmap rr))
|
||||
(bit-string-append
|
||||
acc
|
||||
|
|
@ -298,7 +308,7 @@
|
|||
[else
|
||||
(bit-string (rr :: (t:rr)) 0 ((exact-truncate expiry) :: bits 32))])))))
|
||||
|
||||
;; (: bit-string->zone : BitString -> CompiledZone)
|
||||
(: bit-string->zone : BitString -> CompiledZone)
|
||||
;; Produces a deserialized form of the zone. Suitable for use in loading from disk.
|
||||
(define (bit-string->zone bs)
|
||||
(define now (current-inexact-seconds))
|
||||
|
|
|
|||
Loading…
Reference in New Issue