dns/dns.bend fails
raw source on the hub · import 0x575208cf32f35c10d64d398769aef1bc/dns/dns.bend as Dns
2 imports
import Base import ../wire.bend as Wire
Types
type Cur source · line 7 · raw
Data
Cur@v:U32 -> @rest:String -> Cur
type RR source · line 10 · raw
Data
RRBadRR
RRA@ip:String -> RR
RRSkip@rest:String -> RR
type Try source · line 311 · raw
Data
One attempt's outcome: try again, or this answer (None: no address).
AgainTry
Got@ip:Maybe<&2, String> -> Try
Definitions
def u8 source · line 15 · raw
@s:String -> Maybe<&2, Cur>
def u16.lo source · line 22 · raw
@hi:U32 -> @m:Maybe<&2, Cur> -> Maybe<&2, Cur>
def u16.go source · line 29 · raw
@m:Maybe<&2, Cur> -> Maybe<&2, Cur>
def u16 source · line 36 · raw
@s:String -> Maybe<&2, Cur>
def skip.if source · line 39 · raw
@+s:String -> @+n:Nat -> @short:Bool -> Maybe<&2, String>
def skip source · line 46 · raw
@+s:String -> @+n:Nat -> Maybe<&2, String>
def then source · line 49 · raw
@m:Maybe<&2, String> -> @n:Nat -> Maybe<&2, String>
def push16 source · line 56 · raw
@+n:U32 -> @acc:String -> String
def label.ok source · line 62 · raw
@+l:String -> Bool
def label.ascii source · line 66 · raw
@s:String -> Bool
def labels.ok source · line 73 · raw
@xs:List<&2, String> -> Bool
def labels.put source · line 80 · raw
@xs:List<&2, String> -> @acc:String -> String
def query.if source · line 87 · raw
@+id:U32 -> @xs:List<&2, String> -> @ok:Bool -> Maybe<&2, String>
def query.labels source · line 95 · raw
@+id:U32 -> @+xs:List<&2, String> -> Maybe<&2, String>
def strip_dot.if source · line 98 · raw
@+s:String -> @dot:Bool -> String
def strip_dot source · line 105 · raw
@+s:String -> String
def query source · line 109 · raw
@id:U32 -> @name:String -> Maybe<&2, String>
RFC 1035 §4.1: a standard query for the A record of name.
def name.skip source · line 116 · raw
@fuel:Nat -> @s:String -> Maybe<&2, String>
§4.1.4: a name is labels ending in a zero octet, or a two-octet pointer.
def name.then source · line 127 · raw
@m:Maybe<&2, String> -> @n:Nat -> Maybe<&2, String>
def dotted source · line 134 · raw
@s:String -> String
def rr.f source · line 145 · raw
@+r:String -> @+len:U32 -> @a:Bool -> RR
def rr.data source · line 152 · raw
@+r:String -> @+len:U32 -> @a:Bool -> @short:Bool -> RR
def rr.e source · line 159 · raw
@+ty:U32 -> @+cl:U32 -> @m:Maybe<&2, Cur> -> RR
def rr.d source · line 166 · raw
@ty:U32 -> @cl:U32 -> @m:Maybe<&2, String> -> RR
def rr.c source · line 173 · raw
@ty:U32 -> @m:Maybe<&2, Cur> -> RR
def rr.b source · line 180 · raw
@m:Maybe<&2, Cur> -> RR
def rr.a source · line 187 · raw
@m:Maybe<&2, String> -> RR
def rr source · line 195 · raw
@+s:String -> RR
§4.1.3: NAME, TYPE, CLASS, TTL, RDLENGTH, RDATA.
def answers.scan source · line 199 · raw
@fuel:Nat -> @r:RR -> Maybe<&2, String>
fuel = records left. The first A record wins; CNAMEs before it are skipped.
def questions source · line 212 · raw
@fuel:Nat -> @m:Maybe<&2, String> -> Maybe<&2, String>
def body.go source · line 219 · raw
@an:U32 -> @m:Maybe<&2, String> -> Maybe<&2, String>
def body.an source · line 226 · raw
@qd:U32 -> @m:Maybe<&2, Cur> -> Maybe<&2, String>
def body.qd source · line 233 · raw
@m:Maybe<&2, Cur> -> Maybe<&2, String>
def flags.ok source · line 241 · raw
@+f:U32 -> Bool
§4.1.1: QR set, opcode QUERY, not truncated, RCODE 0.
def head.flags.if source · line 244 · raw
@r:String -> @ok:Bool -> Maybe<&2, String>
def head.flags source · line 251 · raw
@m:Maybe<&2, Cur> -> Maybe<&2, String>
def head.id.if source · line 258 · raw
@r:String -> @ok:Bool -> Maybe<&2, String>
def head.id source · line 265 · raw
@id:U32 -> @m:Maybe<&2, Cur> -> Maybe<&2, String>
def answer source · line 273 · raw
@id:U32 -> @msg:String -> Maybe<&2, String>
The IPv4 address the response gives for the query with this id.
def nameserver.line source · line 279 · raw
@+line:String -> @rest:Maybe<&2, String> -> Maybe<&2, String>
def nameserver.go source · line 282 · raw
@xs:List<&2, String> -> Maybe<&2, String>
def nameserver source · line 290 · raw
@conf:String -> Maybe<&2, String>
The first nameserver line of a resolv.conf.
def none source · line 296 · raw
IO(Maybe<&2, String>)
def ipv4.go source · line 299 · raw
@s:String -> Bool
def ipv4 source · line 307 · raw
@+s:String -> Bool
Digits and dots; TCP.connect rejects anything else that is not an address.
def try.pure source · line 315 · raw
@s:Socket -> @t:Try -> IO(Pair(Socket, Try))
def try.from source · line 319 · raw
@s:Socket -> @+ns:String -> @id:U32 -> @hpd:Pair(String, Pair(U32, String)) -> IO(Pair(Socket, Try))
A datagram from anyone but the nameserver's port 53 is ignored (retried).
def try.back source · line 323 · raw
@ns:String -> @id:U32 -> @m:Pair(Socket, Result<&1, &1, Pair(U32, String), Pair(String, Pair(U32, String))>) -> IO(Pair(Socket, Try))
def try.sent source · line 332 · raw
@ns:String -> @id:U32 -> @m:Pair(Socket, Result<&1, &1, Pair(U32, String), Unit>) -> IO(Pair(Socket, Try))
§4.2.1 and resolv.conf defaults: 5 s per attempt.
def try.once source · line 342 · raw
@s:Socket -> @+ns:String -> @id:U32 -> @q:String -> IO(Pair(Socket, Try))
def try.close source · line 347 · raw
@s:Socket -> @r:Maybe<&2, String> -> IO(Maybe<&2, String>)
def tries.end source · line 352 · raw
@st:Pair(Socket, Try) -> IO(Maybe<&2, String>)
def tries source · line 361 · raw
@fuel:Nat -> @+ns:String -> @+id:U32 -> @+q:String -> @st:Pair(Socket, Try) -> IO(Maybe<&2, String>)
fuel: attempts left (resolv.conf's default is 2).
def resolve.sock source · line 375 · raw
@ns:String -> @id:U32 -> @q:String -> @r:Result<&1, &1, Pair(U32, String), Socket> -> IO(Maybe<&2, String>)
def resolve.q source · line 382 · raw
@ns:String -> @id:U32 -> @q:Maybe<&2, String> -> IO(Maybe<&2, String>)
def resolve.id source · line 392 · raw
@name:String -> @ns:String -> @r:Result<&1, &1, Pair(U32, String), U32> -> IO(Maybe<&2, String>)
§7.3: a random id makes forged answers harder to land.
def resolve.ns source · line 400 · raw
@name:String -> @ns:Maybe<&2, String> -> IO(Maybe<&2, String>)
def conf.text source · line 409 · raw
@r:Result<&1, &1, Pair(U32, String), String> -> String
def resolve.read source · line 416 · raw
@name:String -> @m:Pair(File, Result<&1, &1, Pair(U32, String), String>) -> IO(Maybe<&2, String>)
def resolve.conf source · line 422 · raw
@name:String -> @r:Result<&1, &1, Pair(U32, String), File> -> IO(Maybe<&2, String>)
def resolve.dns source · line 431 · raw
@name:String -> IO(Maybe<&2, String>)
def resolve source · line 438 · raw
@+host:String -> IO(Maybe<&2, String>)
An IPv4 address for host: literals as is, localhost (RFC 6761), else DNS. ponytail: no /etc/hosts, no AAAA, no TCP retry on TC