dns.bend fails
raw source on the hub · import bend-kit-dns@0.3.1.1/dns.bend as Dns
DNS A-record lookup over UDP. Source: https://github.com/paymog/bend-kit/tree/main/dns
2 imports
import Base import 0xb481bb64f1136053b0a6b2c6da6277ab/wire.bend as Wire
Types
type Cur source · line 9 · raw
Data
Cur@v:U32 -> @rest:String -> Cur
type RR source · line 12 · raw
Data
RRBadRR
RRA@ip:String -> RR
RRSkip@rest:String -> RR
type Try source · line 328 · 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 17 · raw
@s:String -> Maybe<&2, Cur>
def u16.lo source · line 24 · raw
@hi:U32 -> @m:Maybe<&2, Cur> -> Maybe<&2, Cur>
def u16.go source · line 31 · raw
@m:Maybe<&2, Cur> -> Maybe<&2, Cur>
def u16 source · line 38 · raw
@s:String -> Maybe<&2, Cur>
def skip.if source · line 41 · raw
@+s:String -> @+n:Nat -> @short:Bool -> Maybe<&2, String>
def skip source · line 48 · raw
@+s:String -> @+n:Nat -> Maybe<&2, String>
def then source · line 51 · raw
@m:Maybe<&2, String> -> @n:Nat -> Maybe<&2, String>
def push16 source · line 58 · raw
@+n:U32 -> @acc:String -> String
def label.ok source · line 64 · raw
@+l:String -> Bool
def label.ascii source · line 68 · raw
@s:String -> Bool
def labels.ok source · line 75 · raw
@xs:List<&2, String> -> Bool
def labels.put source · line 82 · raw
@xs:List<&2, String> -> @acc:String -> String
def query.if source · line 89 · raw
@+id:U32 -> @xs:List<&2, String> -> @ok:Bool -> Maybe<&2, String>
def query.labels source · line 97 · raw
@+id:U32 -> @+xs:List<&2, String> -> Maybe<&2, String>
def strip_dot.if source · line 100 · raw
@+s:String -> @dot:Bool -> String
def strip_dot source · line 107 · raw
@+s:String -> String
def query source · line 111 · 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 118 · 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 129 · raw
@m:Maybe<&2, String> -> @n:Nat -> Maybe<&2, String>
def dotted source · line 136 · raw
@s:String -> String
def rr.f source · line 147 · raw
@+r:String -> @+len:U32 -> @a:Bool -> RR
def rr.data source · line 154 · raw
@+r:String -> @+len:U32 -> @a:Bool -> @short:Bool -> RR
def rr.e source · line 161 · raw
@+ty:U32 -> @+cl:U32 -> @m:Maybe<&2, Cur> -> RR
def rr.d source · line 168 · raw
@ty:U32 -> @cl:U32 -> @m:Maybe<&2, String> -> RR
def rr.c source · line 175 · raw
@ty:U32 -> @m:Maybe<&2, Cur> -> RR
def rr.b source · line 182 · raw
@m:Maybe<&2, Cur> -> RR
def rr.a source · line 189 · raw
@m:Maybe<&2, String> -> RR
def rr source · line 197 · raw
@+s:String -> RR
§4.1.3: NAME, TYPE, CLASS, TTL, RDLENGTH, RDATA.
def answers.scan source · line 201 · 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 214 · raw
@fuel:Nat -> @m:Maybe<&2, String> -> Maybe<&2, String>
def body.go source · line 221 · raw
@an:U32 -> @m:Maybe<&2, String> -> Maybe<&2, String>
def body.an source · line 228 · raw
@qd:U32 -> @m:Maybe<&2, Cur> -> Maybe<&2, String>
def body.qd source · line 235 · raw
@m:Maybe<&2, Cur> -> Maybe<&2, String>
def flags.ok source · line 243 · raw
@+f:U32 -> Bool
§4.1.1: QR set, opcode QUERY, not truncated, RCODE 0.
def head.flags.if source · line 246 · raw
@r:String -> @ok:Bool -> Maybe<&2, String>
def head.flags source · line 253 · raw
@m:Maybe<&2, Cur> -> Maybe<&2, String>
def head.id.if source · line 260 · raw
@r:String -> @ok:Bool -> Maybe<&2, String>
def head.id source · line 267 · raw
@id:U32 -> @m:Maybe<&2, Cur> -> Maybe<&2, String>
def answer source · line 275 · raw
@id:U32 -> @msg:String -> Maybe<&2, String>
The IPv4 address the response gives for the query with this id.
def nameservers.add source · line 281 · raw
@+line:String -> @rest:List<&2, String> -> @hit:Bool -> List<&2, String>
def nameservers.go source · line 288 · raw
@xs:List<&2, String> -> List<&2, String>
def nameservers source · line 296 · raw
@conf:String -> List<&2, String>
Every nameserver line, in file order.
def nameserver.first source · line 299 · raw
@xs:List<&2, String> -> Maybe<&2, String>
def nameserver source · line 307 · raw
@conf:String -> Maybe<&2, String>
The first nameserver line of a resolv.conf.
def none source · line 313 · raw
IO(Maybe<&2, String>)
def ipv4.go source · line 316 · raw
@s:String -> Bool
def ipv4 source · line 324 · raw
@+s:String -> Bool
Digits and dots; TCP.connect rejects anything else that is not an address.
def try.pure source · line 332 · raw
@s:Socket -> @t:Try -> IO(Pair(Socket, Try))
def try.from source · line 336 · 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 340 · 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 349 · 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 359 · raw
@s:Socket -> @+ns:String -> @id:U32 -> @q:String -> IO(Pair(Socket, Try))
def try.close source · line 364 · raw
@s:Socket -> @r:Maybe<&2, String> -> IO(Maybe<&2, String>)
def tries.end source · line 369 · raw
@st:Pair(Socket, Try) -> IO(Maybe<&2, String>)
def tries source · line 378 · 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 392 · raw
@ns:String -> @id:U32 -> @q:String -> @r:Result<&1, &1, Pair(U32, String), Socket> -> IO(Maybe<&2, String>)
def resolve.q source · line 399 · raw
@ns:String -> @id:U32 -> @q:Maybe<&2, String> -> IO(Maybe<&2, String>)
def resolve.id source · line 409 · 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 417 · raw
@name:String -> @ns:Maybe<&2, String> -> IO(Maybe<&2, String>)
def resolve.at source · line 427 · raw
@+host:String -> @ns:String -> IO(Maybe<&2, String>)
Ask one nameserver. Tests use this; resolve reads /etc/resolv.conf.
def conf.text source · line 430 · raw
@r:Result<&1, &1, Pair(U32, String), String> -> String
def resolve.n3 source · line 438 · raw
@+name:String -> @xs:List<&2, String> -> IO(Maybe<&2, String>)
ponytail: 3 nameservers; a longer resolv.conf ignores the rest
def resolve.n2b source · line 445 · raw
@+name:String -> @rest:List<&2, String> -> @ip:Maybe<&2, String> -> IO(Maybe<&2, String>)
def resolve.n2 source · line 452 · raw
@+name:String -> @xs:List<&2, String> -> IO(Maybe<&2, String>)
def resolve.n1b source · line 461 · raw
@+name:String -> @rest:List<&2, String> -> @ip:Maybe<&2, String> -> IO(Maybe<&2, String>)
def resolve.list source · line 468 · raw
@+name:String -> @xs:List<&2, String> -> IO(Maybe<&2, String>)
def resolve.read source · line 477 · raw
@name:String -> @m:Pair(File, Result<&1, &1, Pair(U32, String), String>) -> IO(Maybe<&2, String>)
def resolve.conf source · line 483 · raw
@name:String -> @r:Result<&1, &1, Pair(U32, String), File> -> IO(Maybe<&2, String>)
def resolve.dns source · line 492 · raw
@name:String -> IO(Maybe<&2, String>)
def hosts.pick source · line 498 · raw
@found:Maybe<&2, String> -> @now:Maybe<&2, String> -> Maybe<&2, String>
def hosts.hit source · line 505 · raw
@+ip:String -> @hit:Bool -> Maybe<&2, String>
def hosts.names source · line 512 · raw
@xs:List<&2, String> -> @+name:String -> @+ip:String -> @found:Maybe<&2, String> -> Maybe<&2, String>
def hosts.ip source · line 519 · raw
@+name:String -> @+ip:String -> @ns:List<&2, String> -> @ok:Bool -> Maybe<&2, String>
def hosts.line source · line 526 · raw
@+name:String -> @xs:List<&2, String> -> Maybe<&2, String>
def hosts.sp source · line 533 · raw
@+c:U32 -> @tab:Bool -> U32
def hosts.flat source · line 540 · raw
@s:String -> String
def hosts.scan source · line 547 · raw
@xs:List<&2, String> -> @+name:String -> @found:Maybe<&2, String> -> Maybe<&2, String>
def hosts source · line 555 · raw
@+name:String -> @text:String -> Maybe<&2, String>
First IPv4 address for name in an /etc/hosts file. The name is already lowercase.
def resolve.from source · line 558 · raw
@+name:String -> @m:Maybe<&2, String> -> IO(Maybe<&2, String>)
def resolve.text source · line 565 · raw
@+name:String -> @r:Result<&1, &1, Pair(U32, String), String> -> IO(Maybe<&2, String>)
def resolve.opened source · line 572 · raw
@+name:String -> @m:Pair(File, Result<&1, &1, Pair(U32, String), String>) -> IO(Maybe<&2, String>)
def resolve.hosts source · line 578 · raw
@+name:String -> @r:Result<&1, &1, Pair(U32, String), File> -> IO(Maybe<&2, String>)
def resolve.ask source · line 589 · raw
@+name:String -> IO(Maybe<&2, String>)
An IPv4 address for host: literals as is, localhost (RFC 6761), /etc/hosts, else DNS. ponytail: no AAAA, no TCP retry on TC
def resolve source · line 594 · raw
@+host:String -> IO(Maybe<&2, String>)