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
|
// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
#pragma once
#include <openvpn/acceptor/base.hpp>
#include <openvpn/win/scoped_handle.hpp>
#include <openvpn/win/secattr.hpp>
namespace openvpn {
namespace Acceptor {
class NamedPipe : public Base
{
public:
OPENVPN_EXCEPTION(named_pipe_acceptor_error);
typedef RCPtr<NamedPipe> Ptr;
NamedPipe(openvpn_io::io_context &io_context,
const std::string &name_arg,
const std::string &sddl_string)
: name(name_arg),
handle(io_context),
sa(sddl_string, false, "named pipe")
{
}
virtual void async_accept(ListenerBase *listener,
const size_t acceptor_index,
openvpn_io::io_context &io_context) override
{
// create the named pipe
const HANDLE h = ::CreateNamedPipeA(
name.c_str(),
PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
PIPE_REJECT_REMOTE_CLIENTS | PIPE_TYPE_BYTE | PIPE_READMODE_BYTE,
PIPE_UNLIMITED_INSTANCES,
2048, // output buffer size
2048, // input buffer size
0,
&sa.sa);
if (!Win::Handle::defined(h))
{
const openvpn_io::error_code err(::GetLastError(), openvpn_io::error::get_system_category());
OPENVPN_THROW(named_pipe_acceptor_error, "failed to create named pipe: " << name << " : " << err.message());
}
// wait for connection (asynchronously)
{
handle.assign(h);
openvpn_io::windows::overlapped_ptr over(
io_context,
[self = Ptr(this),
listener = ListenerBase::Ptr(listener),
acceptor_index](const openvpn_io::error_code &ec, size_t bytes_transferred)
{
// accept client connection
listener->handle_accept(new AsioPolySock::NamedPipe(std::move(self->handle), acceptor_index),
ec.value() == ERROR_PIPE_CONNECTED // not an error
? openvpn_io::error_code()
: ec);
});
const BOOL ok = ::ConnectNamedPipe(handle.native_handle(), over.get());
const DWORD err = ::GetLastError();
if (!ok && err != ERROR_IO_PENDING)
{
// The operation completed immediately,
// so a completion notification needs
// to be posted. When complete() is called,
// ownership of the OVERLAPPED-derived
// object passes to the io_service.
const openvpn_io::error_code ec(err, openvpn_io::error::get_system_category());
over.complete(ec, 0);
}
else // ok || err == ERROR_IO_PENDING
{
// The operation was successfully initiated,
// so ownership of the OVERLAPPED-derived object
// has passed to the io_service.
over.release();
}
}
}
virtual void close() override
{
handle.close();
}
private:
std::string name;
openvpn_io::windows::stream_handle handle;
Win::SecurityAttributes sa;
};
} // namespace Acceptor
} // namespace openvpn
|
