albatross/app/vmm_client.ml

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2017-05-26 14:30:34 +00:00
(* (c) 2017 Hannes Mehnert, all rights reserved *)
open Lwt.Infix
open Vmm_core
let my_version = `WV0
let command = ref 1
let process db hdr data =
let open Vmm_wire in
let open Rresult.R.Infix in
if not (version_eq hdr.version my_version) then
Logs.err (fun m -> m "unknown wire protocol version")
else
let r =
match hdr.tag with
| x when x = Client.stat_msg_tag ->
Client.decode_stat data >>= fun (ru, vmm, ifd) ->
Logs.app (fun m -> m "statistics: %a %a %a"
pp_rusage ru
Fmt.(list ~sep:(unit ", ") (pair ~sep:(unit ": ") string uint64)) vmm
Fmt.(list ~sep:(unit ", ") pp_ifdata) ifd) ;
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Ok ()
| x when x = Client.log_msg_tag ->
Client.decode_log data >>= fun log ->
Logs.app (fun m -> m "log: %a" (Vmm_core.Log.pp db) log) ;
Ok ()
| x when x = Client.console_msg_tag ->
Client.decode_console data >>= fun (name, ts, msg) ->
Logs.app (fun m -> m "console %s: %a %s" (translate_serial db name) (Ptime.pp_human ~tz_offset_s:0 ()) ts msg) ;
Ok ()
| x when x = Client.info_msg_tag ->
Client.decode_info data >>= fun vms ->
List.iter (fun (name, cmd, pid, taps) ->
Logs.app (fun m -> m "info %s: %s %d taps %a" (translate_serial db name)
cmd pid Fmt.(list ~sep:(unit ", ") string) taps))
vms ;
Ok ()
| x when x = fail_tag ->
decode_str data >>= fun (msg, _) ->
Logs.err (fun m -> m "failed %s" msg) ;
Ok ()
| x when x = success_tag ->
decode_str data >>= fun (msg, _) ->
Logs.app (fun m -> m "success %s" msg) ;
Ok ()
| x -> Rresult.R.error_msgf "unknown header tag %02X" x
in
match r with
| Ok () -> ()
| Error (`Msg msg) -> Logs.err (fun m -> m "error while processing: %s" msg)
let rec read_tls_write_cons db t =
Vmm_tls.read_tls t >>= function
| Error (`Msg msg) ->
Logs.err (fun m -> m "error while reading %s" msg) ;
read_tls_write_cons db t
| Error _ -> Logs.err (fun m -> m "exception while reading") ; Lwt.return_unit
| Ok (hdr, data) ->
process db hdr data ;
read_tls_write_cons db t
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let rec read_cons_write_tls db t =
Lwt.catch (fun () ->
Lwt_io.read_line Lwt_io.stdin >>= fun line ->
let cmd, arg = match Astring.String.cut ~sep:" " line with
| None -> line, None
| Some (a, b) -> a, Some (translate_name db b)
in
match Vmm_core.cmd_of_string cmd with
| None -> Logs.err (fun m -> m "unknown command") ; read_cons_write_tls db t
| Some cmd ->
let out = Vmm_wire.Client.cmd ?arg cmd !command my_version in
command := succ !command ;
Vmm_tls.write_tls t out >>= function
| Error _ -> Logs.err (fun m -> m "exception while writing") ; Lwt.return_unit
| Ok () ->
Logs.debug (fun m -> m "wrote %a" Cstruct.hexdump_pp (Cstruct.of_string out)) ;
read_cons_write_tls db t)
(fun e ->
Logs.err (fun m -> m "exception %s in read_cons_write_tls" (Printexc.to_string e)) ;
Lwt.return_unit)
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let client cas host port cert priv_key db =
Nocrypto_entropy_lwt.initialize () >>= fun () ->
let auth = if Sys.is_directory cas then `Ca_dir cas else `Ca_file cas in
X509_lwt.authenticator auth >>= fun authenticator ->
Lwt.catch (fun () ->
Lwt_unix.gethostbyname host >>= fun host_entry ->
let host_inet_addr = Array.get host_entry.Lwt_unix.h_addr_list 0 in
let fd = Lwt_unix.socket host_entry.Lwt_unix.h_addrtype Lwt_unix.SOCK_STREAM 0 in
Lwt_unix.connect fd (Lwt_unix.ADDR_INET (host_inet_addr, port)) >>= fun _ ->
X509_lwt.private_of_pems ~cert ~priv_key >>= fun cert ->
(match fst cert with
| [] -> Lwt.fail_with "certificate is empty"
| hd::_ -> Lwt.return hd) >>= fun leaf ->
let certificates = `Single cert in
let client = Tls.Config.client ~reneg:true ~certificates ~authenticator () in
Tls_lwt.Unix.client_of_fd client (* ~host *) fd >>= fun t ->
if Vmm_asn.contains_vm leaf || Vmm_asn.contains_crl leaf then
read_tls_write_cons db t
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else
(Logs.debug (fun m -> m "read/write games!") ;
Lwt.join [ read_tls_write_cons db t ; read_cons_write_tls db t ]))
(fun exn ->
Logs.err (fun m -> m "failed to establish TLS connection: %s"
(Printexc.to_string exn)) ;
Lwt.return_unit)
let run_client _ cas cert key (host, port) db =
Printexc.register_printer (function
| Tls_lwt.Tls_alert x -> Some ("TLS alert: " ^ Tls.Packet.alert_type_to_string x)
| Tls_lwt.Tls_failure f -> Some ("TLS failure: " ^ Tls.Engine.string_of_failure f)
| _ -> None) ;
Sys.(set_signal sigpipe Signal_ignore) ;
let db =
let open Rresult.R.Infix in
match db with
| None -> []
| Some db ->
match Bos.OS.File.read_lines (Fpath.v db) >>= parse_db with
| Ok db -> db
| Error (`Msg m) -> Logs.warn (fun f -> f "couldn't parse database %s" m) ; []
in
Lwt_main.run (client cas host port cert key db)
let setup_log style_renderer level =
Fmt_tty.setup_std_outputs ?style_renderer ();
Logs.set_level level;
Logs.set_reporter (Logs_fmt.reporter ~dst:Format.std_formatter ())
open Cmdliner
let setup_log =
Term.(const setup_log
$ Fmt_cli.style_renderer ()
$ Logs_cli.level ())
let host_port : (string * int) Arg.converter =
let parse s =
try
let open String in
let colon = index s ':' in
let hostname = sub s 0 colon
and port =
let csucc = succ colon in
sub s csucc (length s - csucc)
in
`Ok (hostname, int_of_string port)
with
Not_found -> `Error "broken"
in
parse, fun ppf (h, p) -> Format.fprintf ppf "%s:%d" h p
let cas =
let doc = "The full path to PEM encoded certificate authorities. Can either be a FILE or a DIRECTORY." in
Arg.(required & pos 0 (some string) None & info [] ~docv:"FILE" ~doc)
let client_cert =
let doc = "Use a client certificate chain" in
Arg.(required & pos 1 (some file) None & info [] ~doc)
let client_key =
let doc = "Use a client key" in
Arg.(required & pos 2 (some file) None & info [] ~doc)
let destination =
Arg.(required & pos 3 (some host_port) None & info [] ~docv:"destination"
~doc:"the destination hostname:port to connect to")
let db =
let doc = "Certificate database" in
Arg.(value & opt (some file) None & info [ "db" ] ~doc)
let cmd =
let doc = "VMM TLS client" in
let man = [
`S "DESCRIPTION" ;
`P "$(tname) connects to a server and initiates a TLS handshake" ]
in
Term.(pure run_client $ setup_log $ cas $ client_cert $ client_key $ destination $ db),
Term.info "vmm_client" ~version:"%%VERSION_NUM%%" ~doc ~man
let () =
match Term.eval cmd
with `Error _ -> exit 1 | _ -> exit 0