dns.forwarding: Check in rewritten version
Eduardo Cavazos
parent
6e03452f75
commit
9f131b7e45
extra/dns/forwarding
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@ -1,105 +1,102 @@
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USING: combinators.short-circuit kernel
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combinators
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vectors
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sequences
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USING: kernel sequences combinators accessors locals random
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combinators.short-circuit
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io.sockets
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accessors
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combinators.lib
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newfx
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dns dns.cache dns.misc ;
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dns dns.util dns.cache.rr dns.cache.nx ;
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IN: dns.forwarding
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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! DNS server - caching, forwarding
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: (socket) ( -- vec ) V{ f } ;
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: socket ( -- socket ) (socket) 1st ;
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: init-socket-on-port ( port -- )
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f swap <inet4> <datagram> 0 (socket) as-mutate ;
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: init-socket ( -- ) 53 init-socket-on-port ;
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: forever ( quot -- ) [ call ] [ forever ] bi ; inline recursive
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: (upstream-server) ( -- vec ) V{ f } ;
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:: query->rrs ( QUERY -- rrs/f )
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[let | RRS [ QUERY cache-get ] |
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RRS
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[ RRS ]
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[
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[let | NAME [ QUERY name>> ]
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TYPE [ QUERY type>> ]
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CLASS [ QUERY class>> ] |
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[let | RRS/CNAME [ T{ query f NAME CNAME CLASS } cache-get ] |
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: upstream-server ( -- ip ) (upstream-server) 1st ;
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RRS/CNAME f =
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[ f ]
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[
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[let | RR/CNAME [ RRS/CNAME first ] |
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[let | REAL-NAME [ RR/CNAME rdata>> ] |
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[let | RRS [
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T{ query f REAL-NAME TYPE CLASS } query->rrs
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] |
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: set-upstream-server ( ip -- ) 0 (upstream-server) as-mutate ;
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RRS
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[ RRS/CNAME RRS append ]
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[ f ]
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if
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] ] ]
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]
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if
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] ]
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]
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if
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] ;
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: init-upstream-server ( -- )
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upstream-server not
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[ resolv-conf-server set-upstream-server ]
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when ;
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:: answer-from-cache ( MSG -- msg/f )
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[let | QUERY [ MSG message-query ] |
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[let | NX [ QUERY name>> non-existent-name? ]
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RRS [ QUERY query->rrs ] |
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{
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{ [ NX ] [ MSG NAME-ERROR >>rcode ] }
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{ [ RRS ] [ MSG RRS >>answer-section ] }
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{ [ t ] [ f ] }
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}
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cond
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]
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] ;
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: rrs? ( obj -- ? ) { [ NX = not ] [ f = not ] } 1&& ;
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: message-soa ( message -- rr/soa )
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authority-section>> [ type>> SOA = ] filter first ;
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:: cache-message ( MSG -- msg )
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MSG rcode>> NAME-ERROR =
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[
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[let | NAME [ MSG message-query name>> ]
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TTL [ MSG message-soa ttl>> ] |
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NAME TTL cache-non-existent-name
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]
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]
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when
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MSG answer-section>> [ cache-add ] each
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MSG authority-section>> [ cache-add ] each
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MSG additional-section>> [ cache-add ] each
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MSG ;
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: answer-from-server ( msg servers -- msg ) random ask-server cache-message ;
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:: find-answer ( MSG SERVERS -- msg )
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{ [ MSG answer-from-cache ] [ MSG SERVERS answer-from-server ] } 0|| ;
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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:: start-server ( ADDR-SPEC SERVERS -- )
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[let | SOCKET [ ADDR-SPEC <datagram> ] |
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: query->answer/cache ( query -- rrs/NX/f )
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dup cache-get* dup { [ rrs? ] [ NX = ] } 1||
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[ nip ]
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[
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drop
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dup clone CNAME >>type cache-get* dup { [ NX = ] [ f = ] } 1||
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[ nip ]
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[ ! query rrs
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tuck ! rrs query rrs
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1st ! rrs query rr/cname
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rdata>> ! rrs query name
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>r clone r> >>name ! rrs query
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query->answer/cache ! rrs rrs/NX/f
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dup rrs? [ append ] [ nip ] if
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]
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if
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SOCKET receive-packet
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[ parse-message SERVERS find-answer message->ba ]
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change-data
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respond
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]
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if ;
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forever
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: answer-from-cache ( message -- message/f )
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dup message-query ! message query
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dup query->answer/cache ! message query rrs/NX/f
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{
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{ [ dup f = ] [ 3drop f ] }
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{ [ dup NX = ] [ 2drop NAME-ERROR >>rcode ] }
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{ [ t ] [ nip >>answer-section ] }
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}
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cond ;
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: answer-from-server ( message -- message )
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upstream-server ask-server
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cache-message ;
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: find-answer ( message -- message )
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dup answer-from-cache dup
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[ nip ]
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[ drop answer-from-server ]
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if ;
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: loop ( -- )
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socket receive ! byte-array addr-spec
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swap ! addr-spec byte-array
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parse-message ! addr-spec message
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find-answer ! addr-spec message
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message->ba ! addr-spec byte-array
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swap ! byte-array addr-spec
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socket send
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loop ;
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! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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: start ( -- ) init-socket init-upstream-server loop ;
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MAIN: start
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] ;
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