mirror of
https://github.com/mirage/qubes-mirage-firewall.git
synced 2024-12-26 23:59:39 -05:00
118 lines
4.7 KiB
OCaml
118 lines
4.7 KiB
OCaml
(* Copyright (C) 2015, Thomas Leonard <thomas.leonard@unikernel.com>
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See the README file for details. *)
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open Lwt
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open Qubes
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open Cmdliner
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let src = Logs.Src.create "unikernel" ~doc:"Main unikernel code"
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module Log = (val Logs.src_log src : Logs.LOG)
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let nat_table_size =
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let doc = Arg.info ~doc:"The number of NAT entries to allocate." [ "nat-table-size" ] in
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Mirage_runtime.register_arg Arg.(value & opt int 5_000 doc)
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let ipv4 =
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let doc = Arg.info ~doc:"Manual IP setting." [ "ipv4" ] in
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Mirage_runtime.register_arg Arg.(value & opt string "0.0.0.0" doc)
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let ipv4_gw =
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let doc = Arg.info ~doc:"Manual Gateway IP setting." [ "ipv4-gw" ] in
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Mirage_runtime.register_arg Arg.(value & opt string "0.0.0.0" doc)
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let ipv4_dns =
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let doc = Arg.info ~doc:"Manual DNS IP setting." [ "ipv4-dns" ] in
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Mirage_runtime.register_arg Arg.(value & opt string "10.139.1.1" doc)
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let ipv4_dns2 =
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let doc = Arg.info ~doc:"Manual Second DNS IP setting." [ "ipv4-dns2" ] in
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Mirage_runtime.register_arg Arg.(value & opt string "10.139.1.2" doc)
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module Main (R : Mirage_crypto_rng_mirage.S)(Clock : Mirage_clock.MCLOCK)(Time : Mirage_time.S) = struct
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module Dispatcher = Dispatcher.Make(R)(Clock)(Time)
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module Dns_transport = My_dns.Transport(R)(Clock)(Time)
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module Dns_client = Dns_client.Make(Dns_transport)
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(* Set up networking and listen for incoming packets. *)
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let network dns_client dns_responses dns_servers qubesDB router =
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(* Report success *)
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Dao.set_iptables_error qubesDB "" >>= fun () ->
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(* Handle packets from both networks *)
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Lwt.choose [
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Dispatcher.wait_clients Clock.elapsed_ns dns_client dns_servers qubesDB router ;
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Dispatcher.uplink_wait_update qubesDB router ;
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Dispatcher.uplink_listen Clock.elapsed_ns dns_responses router
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]
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(* Main unikernel entry point (called from auto-generated main.ml). *)
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let start _random _clock _time =
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let open Lwt.Syntax in
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let start_time = Clock.elapsed_ns () in
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(* Start qrexec agent and QubesDB agent in parallel *)
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let* qrexec = RExec.connect ~domid:0 () in
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let agent_listener = RExec.listen qrexec Command.handler in
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let* qubesDB = DB.connect ~domid:0 () in
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let startup_time =
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let (-) = Int64.sub in
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let time_in_ns = Clock.elapsed_ns () - start_time in
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Int64.to_float time_in_ns /. 1e9
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in
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Log.info (fun f -> f "QubesDB and qrexec agents connected in %.3f s" startup_time);
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(* Watch for shutdown requests from Qubes *)
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let shutdown_rq =
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Xen_os.Lifecycle.await_shutdown_request () >>= fun (`Poweroff | `Reboot) ->
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Lwt.return_unit in
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(* Set up networking *)
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let nat = My_nat.create ~max_entries:(nat_table_size ()) in
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let netvm_ip = Ipaddr.V4.of_string_exn (ipv4_gw ()) in
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let our_ip = Ipaddr.V4.of_string_exn (ipv4 ()) in
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let dns = Ipaddr.V4.of_string_exn (ipv4_dns ()) in
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let dns2 = Ipaddr.V4.of_string_exn (ipv4_dns2 ()) in
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let zero_ip = Ipaddr.V4.any in
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let network_config =
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if (netvm_ip = zero_ip && our_ip = zero_ip) then (* Read network configuration from QubesDB *)
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Dao.read_network_config qubesDB >>= fun config ->
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if config.netvm_ip = zero_ip || config.our_ip = zero_ip then
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Log.info (fun f -> f "We currently have no netvm nor command line for setting it up, aborting...");
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assert (config.netvm_ip <> zero_ip && config.our_ip <> zero_ip);
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Lwt.return config
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else begin
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let config:Dao.network_config = {from_cmdline=true; netvm_ip; our_ip; dns; dns2} in
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Lwt.return config
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end
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in
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network_config >>= fun config ->
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(* We now must have a valid netvm IP address and our IP address or crash *)
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Dao.print_network_config config ;
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(* Set up client-side networking *)
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let* clients = Client_eth.create config in
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(* Set up routing between networks and hosts *)
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let router = Dispatcher.create
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~config
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~clients
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~nat
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~uplink:None
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in
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let send_dns_query = Dispatcher.send_dns_client_query router in
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let dns_mvar = Lwt_mvar.create_empty () in
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let nameservers = `Udp, [ config.Dao.dns, 53 ; config.Dao.dns2, 53 ] in
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let dns_client = Dns_client.create ~nameservers (router, send_dns_query, dns_mvar) in
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let dns_servers = [ config.Dao.dns ; config.Dao.dns2 ] in
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let net_listener = network (Dns_client.getaddrinfo dns_client Dns.Rr_map.A) dns_mvar dns_servers qubesDB router in
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(* Report memory usage to XenStore *)
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Memory_pressure.init ();
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(* Run until something fails or we get a shutdown request. *)
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Lwt.choose [agent_listener; net_listener; shutdown_rq] >>= fun () ->
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(* Give the console daemon time to show any final log messages. *)
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Time.sleep_ns (1.0 *. 1e9 |> Int64.of_float)
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end
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