dns.forwarding: Check in rewritten version

db4
Eduardo Cavazos 2008-10-18 12:54:05 -05:00
parent 6e03452f75
commit 9f131b7e45
1 changed files with 82 additions and 85 deletions

View File

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