652 lines
24 KiB
OCaml
652 lines
24 KiB
OCaml
open Syntax
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let src = Logs.Src.create "server"
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module Log = (val Logs.src_log src : Logs.LOG)
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let is_digit = function '0' .. '9' -> true | _ -> false
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let root =
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{plain|Hello fellows!
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This unikernel is a simple example of a website that supports HTTP/1.1, H2 and
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the TLS security layer. This is an example of how to make a website with
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MirageOS.
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The website has several endpoints:
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- `http{,s}://$hostname/` the page you are about to read.
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- `http{,s}://$hostname/transmit` a page that copies what is sent (no matter
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how big it is)
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- `http{,s}://$hostname/hash` calculates a hash from a random content
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generated by a seed `x-seed`
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- `http{,s}://$hostname/random` a page that waits in the request for a size
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(`x-length`) and generates a random (optionally seeded by `x-seed`) content
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encoded in base64
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These different endpoints allow performance tests of what MirageOS can offer.
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Have fun, and hack it!
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|plain}
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let random_cstruct ~g buf len =
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for i = 0 to Cstruct.length buf - 1 do
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let v = Random.State.bits g land 0xff in
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Cstruct.set_uint8 buf i v
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done;
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Cstruct.sub buf 0 len
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let random_state_of_seed str =
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match Base64.decode str with
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| Error _ -> None
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| Ok seed ->
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let res = Array.make (String.length seed / 2) 0 in
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for i = 0 to (String.length seed / 2) - 1 do
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res.(i) <-
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(Char.code seed.[i * 2] lsl 8) lor Char.code seed.[(i * 2) + 1]
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done;
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Some (Random.State.make res)
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let transmit_random ~write_string ~flush ~close_writer
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?(g = Random.State.make_self_init ()) length body =
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let tmp = Bytes.create (0x1000 * 4) in
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let rnd = Cstruct.create 0x1000 in
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let ctx = Digestif.SHA256.empty in
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let encoder = Base64_rfc2045.encoder `Manual in
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let rec go ctx length cs = function
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| `Ok when Cstruct.length cs = 0 -> encode ctx length
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| `Ok ->
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go ctx length (Cstruct.shift cs 1)
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(Base64_rfc2045.encode encoder (`Char (Cstruct.get_char cs 0)))
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| `Partial ->
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let len = Bytes.length tmp - Base64_rfc2045.dst_rem encoder in
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write_string body (Bytes.sub_string tmp 0 len);
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Base64_rfc2045.dst encoder tmp 0 (Bytes.length tmp);
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let next () = go ctx length cs (Base64_rfc2045.encode encoder `Await) in
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flush body next
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and encode ctx = function
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| 0L -> finalize ctx (Base64_rfc2045.encode encoder `End)
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| length ->
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let len = min (Int64.of_int (Cstruct.length rnd)) length in
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let ({ Cstruct.buffer; off; len= buffer_len } as rnd) =
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random_cstruct ~g rnd (Int64.to_int len)
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in
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Log.debug (fun m ->
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m "@[<hov>%a@]"
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(Hxd_string.pp Hxd.default)
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(Bigstringaf.substring buffer ~off ~len:buffer_len));
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let ctx =
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Digestif.SHA256.feed_bigstring ctx ~off ~len:buffer_len buffer
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in
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go ctx (Int64.sub length len) rnd `Ok
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and finalize ctx = function
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| `Partial ->
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let len = Bytes.length tmp - Base64_rfc2045.dst_rem encoder in
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write_string body (Bytes.sub_string tmp 0 len);
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Base64_rfc2045.dst encoder tmp 0 (Bytes.length tmp);
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let next () = finalize ctx (Base64_rfc2045.encode encoder `Await) in
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flush body next
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| `Ok ->
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Logs.debug (fun m ->
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m "%a" Digestif.SHA256.pp (Digestif.SHA256.get ctx));
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close_writer body
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in
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Base64_rfc2045.dst encoder tmp 0 (Bytes.length tmp);
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encode ctx length
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let hash ~version ~create ?seed length =
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let rec go g rnd ctx = function
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| 0L ->
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let headers =
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[
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("content-length", string_of_int (Digestif.SHA256.digest_size * 2));
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("content-type", "text/plain");
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]
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in
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(* XXX(dinosaure): Connection: Close header is only true for http/1.1.
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For h2, curl complains and abruptely closes the connection. The most
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important seems Content-Length which closes properly the connection
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on both sides. *)
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let headers =
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match version with
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| `HTTP_1_1 -> ("connection", "close") :: headers
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| `HTTP_2_0 -> headers
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in
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let response = create headers `OK in
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(response, Digestif.SHA256.(to_hex (get ctx)))
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| length ->
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let len = min (Int64.of_int (Cstruct.length rnd)) length in
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let { Cstruct.buffer; off; len= buffer_len } =
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random_cstruct ~g rnd (Int64.to_int len)
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in
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Log.debug (fun m ->
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m "@[<hov>%a@]"
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(Hxd_string.pp Hxd.default)
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(Bigstringaf.substring buffer ~off ~len:buffer_len));
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let ctx =
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Digestif.SHA256.feed_bigstring ctx ~off ~len:buffer_len buffer
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in
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go g rnd ctx (Int64.sub length len)
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in
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match
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( Option.bind seed random_state_of_seed,
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Option.bind length Int64.of_string_opt )
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with
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| Some g, Some length ->
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go g (Cstruct.create 0x1000) Digestif.SHA256.empty length
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| _ ->
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let contents = "Invalid seed." in
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let headers =
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[
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("content-length", string_of_int (String.length contents));
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("content-type", "text/plain");
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]
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in
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let headers =
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match version with
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| `HTTP_1_1 -> ("connection", "close") :: headers
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| `HTTP_2_0 -> headers
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in
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let response = create headers `Bad_request in
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(response, contents)
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module Cache = Ephemeron.K1.Make (struct
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type t = string option * string option
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let equal = ( = )
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let hash = Hashtbl.hash
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end)
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module type S = sig
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type response
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type request
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val version : [ `HTTP_1_1 | `HTTP_2_0 ]
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val create : (string * string) list -> H2.Status.t -> response
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val with_etag : string -> response -> response
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val with_status : H2.Status.t -> response -> response
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val get : request -> string -> string option
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end
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let hash_of_seed : type response request.
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(module S with type response = response and type request = request) ->
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respond:(response -> string -> unit) ->
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request ->
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unit =
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fun (module S) ->
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();
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let tbl = Cache.create 0x100 in
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fun ~respond request ->
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let seed = S.get request "x-seed" and length = S.get request "x-length" in
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match
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(Cache.find_opt tbl (seed, length), S.get request "if-none-match")
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with
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| None, _ | Some _, None ->
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let response, contents =
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hash ~version:S.version ~create:S.create ?seed length
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in
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Cache.add tbl (seed, length) (response, contents);
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respond response contents
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| Some (response, contents), Some etags ->
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let hash = Digestif.SHA256.digest_string contents in
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let hash = Digestif.SHA256.to_hex hash in
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if List.mem hash (String.split_on_char ',' etags) then
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let response =
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S.with_etag hash (S.with_status `Not_modified response)
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in
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respond response String.empty
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else respond response contents
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let transmit_over_http : to_close:_ -> Mimic.flow -> Mimic.flow -> unit Lwt.t =
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fun ~to_close src dst ->
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let closed = Lwt_mvar.create_empty () in
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let rec loop ~src ~dst () =
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let* res =
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Lwt.pick
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[
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(let+? v = Mimic.read src in
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(v :> [ `Closed | _ Mirage_flow.or_eof ]));
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(let+ v = Lwt_mvar.take closed in
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Ok v);
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]
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in
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match res with
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| Error err ->
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Log.err (fun m ->
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m "Got an error while we reading the source (CONNECT): %a."
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Mimic.pp_error err);
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if Lwt_mvar.is_empty closed then Lwt_mvar.put closed `Closed
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else Lwt.return_unit
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| Ok `Closed -> Lwt.return_unit
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| Ok `Eof ->
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if Lwt_mvar.is_empty closed then Lwt_mvar.put closed `Closed
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else Lwt.return_unit
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| Ok (`Data cs) -> (
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Log.debug (fun m -> m "Transfer over HTTP:");
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Log.debug (fun m ->
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m "@[<hov>%a@]." (Hxd_string.pp Hxd.default) (Cstruct.to_string cs));
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let* res = Mimic.write dst cs in
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match res with
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| Ok () ->
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let* () = Lwt.pause () in
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loop ~src ~dst ()
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| Error err ->
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Log.err (fun m ->
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m
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"Got an error while we writing into the destination \
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(CONNECT): %a."
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Mimic.pp_write_error err);
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if Lwt_mvar.is_empty closed then Lwt_mvar.put closed `Closed
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else Lwt.return_unit)
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in
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let* () = Lwt.join [ loop ~src ~dst (); loop ~src:dst ~dst:src () ] in
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to_close src;
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let* () = Lwt.join [ Mimic.close src; Mimic.close dst ] in
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Log.debug (fun m -> m "Connection closed properly on both side.");
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Lwt.return_unit
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(***** HTTP/1.1 *****)
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module S_HTTP_1_1 = struct
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type request = H1.Request.t
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type response = H1.Response.t
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let version = `HTTP_1_1
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let get request name = H1.Headers.get request.H1.Request.headers name
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let create headers = function
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| #H1.Status.t as status ->
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H1.Response.create ~headers:(H1.Headers.of_list headers) status
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| _ -> assert false
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let with_etag etag response =
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let headers = response.H1.Response.headers in
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{ response with H1.Response.headers= H1.Headers.add headers "etag" etag }
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let with_status (status : H2.Status.t) response =
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match status with
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| #H1.Status.t as status -> { response with H1.Response.status }
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| _ -> assert false
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end
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let transmit src dst =
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let rec on_eof () = H1.Body.Reader.close src; H1.Body.Writer.close dst
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and on_read buf ~off ~len =
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H1.Body.Writer.write_bigstring dst ~off ~len buf;
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H1.Body.Reader.schedule_read src ~on_eof ~on_read
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in
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H1.Body.Reader.schedule_read src ~on_eof ~on_read
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let connect_http_1_1 ~ctx ~authenticator ~to_close flow reqd =
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let request = H1.Reqd.request reqd in
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match H1.Headers.get request.H1.Request.headers "host" with
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| Some uri ->
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let uri = "http://" ^ uri in
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Lwt.async (fun () ->
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let* res = Connect.create_connection ~ctx ~authenticator uri in
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match res with
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| Ok dst ->
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let headers = H1.Headers.of_list [ ("connection", "close") ] in
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let response =
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H1.Response.create ~reason:"CONNECT" ~headers `OK
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in
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H1.Reqd.respond_with_string reqd response "";
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H1.Body.Reader.close (H1.Reqd.request_body reqd);
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transmit_over_http ~to_close flow dst
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| Error err ->
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Log.err (fun m ->
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m "Got an error while connection to %S: %a." uri
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Mimic.pp_error err);
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let contents = Fmt.str "Invalid URI: %S" uri in
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let headers =
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H1.Headers.of_list
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[
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("content-length", string_of_int (String.length contents));
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("connection", "close"); ("content-type", "text/plain");
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]
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in
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let response =
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H1.Response.create ~reason:"CONNECT" ~headers `Bad_request
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in
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H1.Reqd.respond_with_string reqd response contents;
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Lwt.return_unit)
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| None ->
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let contents = "Missing Host field." in
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let headers =
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H1.Headers.of_list
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[
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("content-length", string_of_int (String.length contents));
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("connection", "close"); ("content-type", "text/plain");
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]
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in
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let response =
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H1.Response.create ~reason:"CONNECT" ~headers `Bad_request
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in
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H1.Reqd.respond_with_string reqd response contents
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let http_1_1_request_handler ~ctx ~authenticator ~to_close =
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let hash_of_seed = hash_of_seed (module S_HTTP_1_1) in
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fun flow reqd ->
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let request = H1.Reqd.request reqd in
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Log.debug (fun m ->
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m "(HTTP/1.1) request-handler: %S" request.H1.Request.target);
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match request.H1.Request.meth with
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| `CONNECT ->
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Log.debug (fun m -> m "Start to transmit data over HTTP/1.1.");
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connect_http_1_1 ~ctx ~authenticator ~to_close flow reqd
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| _meth -> (
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match String.split_on_char '/' request.H1.Request.target with
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| [ ""; "" ] ->
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let headers =
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H1.Headers.of_list
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[
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("content-length", string_of_int (String.length root));
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("connection", "close"); ("content-type", "text/plain");
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]
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in
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let response = H1.Response.create ~reason:"root" ~headers `OK in
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H1.Reqd.respond_with_string reqd response root
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| [ ""; "transmit" ] ->
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let content_type =
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H1.Headers.get request.H1.Request.headers "content-type"
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in
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let content_type =
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Option.value ~default:"application/octet-stream" content_type
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in
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let headers =
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H1.Headers.of_list
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[
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("transfer-encoding", "chunked");
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("content-type", content_type);
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]
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in
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let response = H1.Response.create ~reason:"transmit" ~headers `OK in
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let src = H1.Reqd.request_body reqd in
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let dst = H1.Reqd.respond_with_streaming reqd response in
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transmit src dst
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| [ ""; "hash" ] ->
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let respond response contents =
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H1.Reqd.respond_with_string reqd response contents
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in
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hash_of_seed ~respond request
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| [ ""; "random" ] -> (
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match H1.Headers.get request.H1.Request.headers "x-length" with
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| Some v when String.for_all is_digit v ->
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let length = Int64.of_string v in
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let g =
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Option.bind
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(H1.Headers.get request.H1.Request.headers "x-seed")
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random_state_of_seed
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in
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let headers =
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H1.Headers.of_list
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[
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("content-type", "text/plain");
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("transfer-encoding", "chunked");
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]
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in
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let response =
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H1.Response.create ~reason:"random" ~headers `OK
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in
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let body = H1.Reqd.respond_with_streaming reqd response in
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transmit_random
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~write_string:(fun body str ->
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H1.Body.Writer.write_string body str)
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~flush:H1.Body.Writer.flush ~close_writer:H1.Body.Writer.close
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?g length body
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| _ ->
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let contents = "Invalid length." in
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let headers =
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H1.Headers.of_list
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[
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("content-length", string_of_int (String.length contents));
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("connection", "close"); ("content-type", "text/plain");
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]
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in
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let response =
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H1.Response.create ~reason:"random" ~headers `Bad_request
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in
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H1.Reqd.respond_with_string reqd response contents)
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| _ ->
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let contents = "Not found." in
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let headers =
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H1.Headers.of_list
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[
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("content-type", "text/plain"); ("connection", "close");
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("content-length", string_of_int (String.length contents));
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]
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in
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let response =
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H1.Response.create ~reason:"not-found" ~headers `Not_found
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in
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H1.Reqd.respond_with_string reqd response contents)
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(***** H2 *****)
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module S_HTTP_2_0 = struct
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type request = H2.Request.t
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type response = H2.Response.t
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let version = `HTTP_2_0
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let get request name = H2.Headers.get request.H2.Request.headers name
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let create headers status =
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H2.Response.create ~headers:(H2.Headers.of_list headers) status
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let with_etag etag response =
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let headers = response.H2.Response.headers in
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{ response with H2.Response.headers= H2.Headers.add headers "etag" etag }
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let with_status status response = { response with H2.Response.status }
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end
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let transmit src dst =
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let rec on_eof () = H2.Body.Reader.close src; H2.Body.Writer.close dst
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and on_read buf ~off ~len =
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H2.Body.Writer.write_bigstring dst ~off ~len buf;
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H2.Body.Reader.schedule_read src ~on_eof ~on_read
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in
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H2.Body.Reader.schedule_read src ~on_eof ~on_read
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let connect_http_2_0 ~ctx ~authenticator ~to_close flow reqd =
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let request = H2.Reqd.request reqd in
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match H2.Headers.get request.H2.Request.headers "host" with
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| Some uri ->
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let uri = "http://" ^ uri in
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Lwt.async (fun () ->
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let* res = Connect.create_connection ~ctx ~authenticator uri in
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match res with
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| Ok dst ->
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let response = H2.Response.create `OK in
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H2.Reqd.respond_with_string reqd response "";
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H2.Body.Reader.close (H2.Reqd.request_body reqd);
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transmit_over_http ~to_close flow dst
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| Error err ->
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Log.err (fun m ->
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m "Got an error while connection to %S: %a." uri
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Mimic.pp_error err);
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let contents = Fmt.str "Invalid URI: %S" uri in
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let headers =
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H2.Headers.of_list
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[
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("content-length", string_of_int (String.length contents));
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("content-type", "text/plain");
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]
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in
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let response = H2.Response.create ~headers `Bad_request in
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H2.Reqd.respond_with_string reqd response contents;
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Lwt.return_unit)
|
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| None ->
|
|
let contents = "Missing Host field." in
|
|
let headers =
|
|
H2.Headers.of_list
|
|
[
|
|
("content-length", string_of_int (String.length contents));
|
|
("content-type", "text/plain");
|
|
]
|
|
in
|
|
let response = H2.Response.create ~headers `Bad_request in
|
|
H2.Reqd.respond_with_string reqd response contents
|
|
|
|
let http_2_0_request_handler ~ctx ~authenticator ~to_close =
|
|
let hash_of_seed = hash_of_seed (module S_HTTP_2_0) in
|
|
fun flow reqd ->
|
|
let request = H2.Reqd.request reqd in
|
|
Log.debug (fun m -> m "(H2) request-handler: %S" request.H2.Request.target);
|
|
match request.H2.Request.meth with
|
|
| `CONNECT ->
|
|
Log.debug (fun m -> m "Start to transmit data over H2.");
|
|
connect_http_2_0 ~ctx ~authenticator ~to_close flow reqd
|
|
| _meth -> (
|
|
match String.split_on_char '/' request.H2.Request.target with
|
|
| [ ""; "" ] ->
|
|
let headers =
|
|
H2.Headers.of_list
|
|
[
|
|
("content-length", string_of_int (String.length root));
|
|
("content-type", "text/plain");
|
|
]
|
|
in
|
|
let response = H2.Response.create ~headers `OK in
|
|
H2.Reqd.respond_with_string reqd response root
|
|
| [ ""; "transmit" ] ->
|
|
let content_type =
|
|
H2.Headers.get request.H2.Request.headers "content-type"
|
|
in
|
|
let content_type =
|
|
Option.value ~default:"application/octet-stream" content_type
|
|
in
|
|
let headers =
|
|
H2.Headers.of_list [ ("content-type", content_type) ]
|
|
in
|
|
let response = H2.Response.create ~headers `OK in
|
|
let src = H2.Reqd.request_body reqd in
|
|
let dst = H2.Reqd.respond_with_streaming reqd response in
|
|
transmit src dst
|
|
| [ ""; "hash" ] ->
|
|
let respond response contents =
|
|
H2.Reqd.respond_with_string reqd response contents
|
|
in
|
|
hash_of_seed ~respond request
|
|
| [ ""; "random" ] -> (
|
|
match H2.Headers.get request.H2.Request.headers "x-length" with
|
|
| Some v when String.for_all is_digit v ->
|
|
let length = Int64.of_string v in
|
|
let g =
|
|
Option.bind
|
|
(H2.Headers.get request.H2.Request.headers "x-seed")
|
|
random_state_of_seed
|
|
in
|
|
let headers =
|
|
H2.Headers.of_list [ ("content-type", "text/plain") ]
|
|
in
|
|
let response = H2.Response.create ~headers `OK in
|
|
let body = H2.Reqd.respond_with_streaming reqd response in
|
|
let flush body next =
|
|
H2.Body.Writer.flush body (fun _reason -> next ())
|
|
in
|
|
transmit_random
|
|
~write_string:(fun body str ->
|
|
H2.Body.Writer.write_string body str)
|
|
~flush ~close_writer:H2.Body.Writer.close ?g length body
|
|
| _ ->
|
|
let contents = "Invalid length." in
|
|
let headers =
|
|
H2.Headers.of_list
|
|
[
|
|
("content-length", string_of_int (String.length contents));
|
|
("content-type", "text/plain");
|
|
]
|
|
in
|
|
let response = H2.Response.create ~headers `Bad_request in
|
|
H2.Reqd.respond_with_string reqd response contents)
|
|
| _ ->
|
|
let contents = "Not found." in
|
|
let headers =
|
|
H2.Headers.of_list
|
|
[
|
|
("content-type", "text/plain");
|
|
("content-length", string_of_int (String.length contents));
|
|
]
|
|
in
|
|
let response = H2.Response.create ~headers `Not_found in
|
|
H2.Reqd.respond_with_string reqd response contents)
|
|
|
|
let alpn_request_handler : type reqd headers request response ro wo.
|
|
ctx:_ ->
|
|
authenticator:_ ->
|
|
to_close:_ ->
|
|
?shutdown:_ ->
|
|
_ ->
|
|
_ ->
|
|
reqd ->
|
|
(reqd, headers, request, response, ro, wo) Alpn.protocol ->
|
|
unit =
|
|
fun ~ctx ~authenticator ~to_close ?shutdown:_ flow _edn reqd -> function
|
|
| Alpn.HTTP_1_1 _ ->
|
|
http_1_1_request_handler ~ctx ~authenticator ~to_close flow reqd
|
|
| Alpn.H2 _ ->
|
|
http_2_0_request_handler ~ctx ~authenticator ~to_close flow reqd
|
|
|
|
let headers_of_list : type reqd headers request response ro wo.
|
|
(reqd, headers, request, response, ro, wo) Alpn.protocol ->
|
|
(string * string) list ->
|
|
headers =
|
|
fun protocol lst ->
|
|
match protocol with
|
|
| Alpn.HTTP_1_1 _ -> H1.Headers.of_list lst
|
|
| Alpn.H2 _ -> H2.Headers.of_list lst
|
|
|
|
let respond_with_string : type reqd headers request response ro wo.
|
|
(reqd, headers, request, response, ro, wo) Alpn.protocol ->
|
|
headers:headers ->
|
|
respond:(headers -> wo) ->
|
|
string ->
|
|
unit =
|
|
fun protocol ~headers ~respond str ->
|
|
let body = respond headers in
|
|
match protocol with
|
|
| Alpn.HTTP_1_1 _ ->
|
|
H1.Body.Writer.write_string body str;
|
|
H1.Body.Writer.close body
|
|
| Alpn.H2 _ ->
|
|
H2.Body.Writer.write_string body str;
|
|
H2.Body.Writer.close body
|
|
|
|
let alpn_error_handler : type reqd headers request response ro wo.
|
|
_ ->
|
|
(reqd, headers, request, response, ro, wo) Alpn.protocol ->
|
|
?request:_ ->
|
|
_ ->
|
|
(headers -> wo) ->
|
|
unit =
|
|
fun _edn protocol ?request:_ error respond ->
|
|
let contents =
|
|
match error with
|
|
| `Bad_gateway -> {plain|Bad gateway.|plain}
|
|
| `Bad_request -> {plain|Bad request.|plain}
|
|
| `Exn (Paf.Flow err) | `Exn (Paf.Flow_write err) ->
|
|
Fmt.str {plain|I/O error: %s.|plain} err
|
|
| `Exn exn ->
|
|
Fmt.str {plain|Unknown error: %S.|plain} (Printexc.to_string exn)
|
|
| `Internal_server_error -> {plain|Internal server error.|plain}
|
|
in
|
|
let headers =
|
|
headers_of_list protocol
|
|
[
|
|
("content-type", "text/plain");
|
|
("content-length", string_of_int (String.length contents));
|
|
]
|
|
in
|
|
respond_with_string protocol ~respond ~headers contents
|
|
|
|
let http_1_1_error_handler edn ?request error respond =
|
|
alpn_error_handler edn ?request Alpn.http_1_1
|
|
(error :> Alpn.server_error)
|
|
respond
|
|
|
|
let http_2_0_error_handler edn ?request error respond =
|
|
alpn_error_handler edn ?request Alpn.h2 (error :> Alpn.server_error) respond
|