Source file tcpip_stack_socket.ml

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
(*
 * Copyright (c) 2014 Anil Madhavapeddy <anil@recoil.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *)

open Lwt.Infix

let src = Logs.Src.create "tcpip-stack-socket" ~doc:"Platform's native TCP/IP stack"
module Log = (val Logs.src_log src : Logs.LOG)

module V4 = struct
  module TCPV4 = Tcpv4_socket
  module UDPV4 = Udpv4_socket
  module IPV4  = Ipv4_socket

  type t = {
    udpv4 : UDPV4.t;
    tcpv4 : TCPV4.t;
    stop : unit Lwt.u;
    switched_off : unit Lwt.t;
  }

  let udpv4 { udpv4; _ } = udpv4
  let tcpv4 { tcpv4; _ } = tcpv4
  let ipv4 _ = ()

  let listen_udpv4 t ~port callback =
    UDPV4.listen t.udpv4 ~port callback

  let listen_tcpv4 ?keepalive t ~port callback =
    TCPV4.listen t.tcpv4 ~port ?keepalive callback

  let listen t = t.switched_off

  let connect udpv4 tcpv4 =
    Log.info (fun f -> f "IPv4 socket stack: connect");
    let switched_off, stop = Lwt.wait () in
    TCPV4.set_switched_off tcpv4 switched_off;
    UDPV4.set_switched_off udpv4 switched_off;
    Lwt.return { tcpv4; udpv4; stop; switched_off }

  let disconnect t =
    TCPV4.disconnect t.tcpv4 >>= fun () ->
    UDPV4.disconnect t.udpv4 >|= fun () ->
    Lwt.wakeup_later t.stop ()
end

module V6 = struct
  module TCP = Tcpv6_socket
  module UDP = Udpv6_socket
  module IP  = Ipv6_socket

  type t = {
    udp : UDP.t;
    tcp : TCP.t;
    stop : unit Lwt.u;
    switched_off : unit Lwt.t;
  }

  let udp { udp; _ } = udp
  let tcp { tcp; _ } = tcp
  let ip _ = ()

  let listen_udp t ~port callback =
    UDP.listen t.udp ~port callback

  let listen_tcp ?keepalive t ~port callback =
    TCP.listen t.tcp ~port ?keepalive callback

  let listen t = t.switched_off

  let connect udp tcp =
    Log.info (fun f -> f "IPv6 socket stack: connect");
    let switched_off, stop = Lwt.wait () in
    UDP.set_switched_off udp switched_off;
    TCP.set_switched_off tcp switched_off;
    Lwt.return { tcp; udp; stop; switched_off }

  let disconnect t =
    TCP.disconnect t.tcp >>= fun () ->
    UDP.disconnect t.udp >|= fun () ->
    Lwt.wakeup_later t.stop ()
end

module V4V6 = struct
  module TCP = Tcpv4v6_socket
  module UDP = Udpv4v6_socket
  module IP  = Ipv4v6_socket

  type t = {
    udp : UDP.t;
    tcp : TCP.t;
    stop : unit Lwt.u;
    switched_off : unit Lwt.t;
  }

  let udp { udp; _ } = udp
  let tcp { tcp; _ } = tcp
  let ip _ = ()

  let listen_udp t ~port callback =
    UDP.listen t.udp ~port callback

  let listen_tcp ?keepalive t ~port callback =
    TCP.listen t.tcp ~port ?keepalive callback

  let listen t = t.switched_off

  let connect udp tcp =
    Log.info (fun f -> f "Dual IPv4 and IPv6 socket stack: connect");
    let switched_off, stop = Lwt.wait () in
    UDP.set_switched_off udp switched_off;
    TCP.set_switched_off tcp switched_off;
    Lwt.return { tcp; udp; stop; switched_off }

  let disconnect t =
    TCP.disconnect t.tcp >>= fun () ->
    UDP.disconnect t.udp >|= fun () ->
    Lwt.wakeup_later t.stop ()
end