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# GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc.
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## Preamble
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### 8. Termination.
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You may not impose any further restrictions on the exercise of the
rights granted or affirmed under this License. For example, you may
not impose a license fee, royalty, or other charge for exercise of
rights granted under this License, and you may not initiate litigation
(including a cross-claim or counterclaim in a lawsuit) alleging that
any patent claim is infringed by making, using, selling, offering for
sale, or importing the Program or any portion of it.
### 11. Patents.
A "contributor" is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The
work thus licensed is called the contributor's "contributor version".
A contributor's "essential patent claims" are all patent claims owned
or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner, permitted
by this License, of making, using, or selling its contributor version,
but do not include claims that would be infringed only as a
consequence of further modification of the contributor version. For
purposes of this definition, "control" includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor's essential patent claims, to
make, use, sell, offer for sale, import and otherwise run, modify and
propagate the contents of its contributor version.
In the following three paragraphs, a "patent license" is any express
agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to
sue for patent infringement). To "grant" such a patent license to a
party means to make such an agreement or commitment not to enforce a
patent against the party.
If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
to copy, free of charge and under the terms of this License, through a
publicly available network server or other readily accessible means,
then you must either (1) cause the Corresponding Source to be so
available, or (2) arrange to deprive yourself of the benefit of the
patent license for this particular work, or (3) arrange, in a manner
consistent with the requirements of this License, to extend the patent
license to downstream recipients. "Knowingly relying" means you have
actual knowledge that, but for the patent license, your conveying the
covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate, modify
or convey a specific copy of the covered work, then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it.
A patent license is "discriminatory" if it does not include within the
scope of its coverage, prohibits the exercise of, or is conditioned on
the non-exercise of one or more of the rights that are specifically
granted under this License. You may not convey a covered work if you
are a party to an arrangement with a third party that is in the
business of distributing software, under which you make payment to the
third party based on the extent of your activity of conveying the
work, and under which the third party grants, to any of the parties
who would receive the covered work from you, a discriminatory patent
license (a) in connection with copies of the covered work conveyed by
you (or copies made from those copies), or (b) primarily for and in
connection with specific products or compilations that contain the
covered work, unless you entered into that arrangement, or that patent
license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
### 12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under
this License and any other pertinent obligations, then as a
consequence you may not convey it at all. For example, if you agree to
terms that obligate you to collect a royalty for further conveying
from those to whom you convey the Program, the only way you could
satisfy both those terms and this License would be to refrain entirely
from conveying the Program.
### 13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
### 14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions
of the GNU General Public License from time to time. Such new versions
will be similar in spirit to the present version, but may differ in
detail to address new problems or concerns.
Each version is given a distinguishing version number. If the Program
specifies that a certain numbered version of the GNU General Public
License "or any later version" applies to it, you have the option of
following the terms and conditions either of that numbered version or
of any later version published by the Free Software Foundation. If the
Program does not specify a version number of the GNU General Public
License, you may choose any version ever published by the Free
Software Foundation.
If the Program specifies that a proxy can decide which future versions
of the GNU General Public License can be used, that proxy's public
statement of acceptance of a version permanently authorizes you to
choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
### 15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
CORRECTION.
### 16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
### 17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
## How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.
To do so, attach the following notices to the program. It is safest to
attach them to the start of each source file to most effectively state
the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper
mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands \`show w' and \`show c' should show the
appropriate parts of the General Public License. Of course, your
program's commands might be different; for a GUI interface, you would
use an "about box".
You should also get your employer (if you work as a programmer) or
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. For more information on this, and how to apply and follow
the GNU GPL, see <https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your
program into proprietary programs. If your program is a subroutine
library, you may consider it more useful to permit linking proprietary
applications with the library. If this is what you want to do, use the
GNU Lesser General Public License instead of this License. But first,
please read <https://www.gnu.org/licenses/why-not-lgpl.html>.

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Microsoft Visual Studio Solution File, Format Version 12.00
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "QMPSharp", "QMPSharp\QMPSharp.csproj", "{FB01A0D9-B114-4843-9A35-46F5CFC785F2}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{FB01A0D9-B114-4843-9A35-46F5CFC785F2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{FB01A0D9-B114-4843-9A35-46F5CFC785F2}.Debug|Any CPU.Build.0 = Debug|Any CPU
{FB01A0D9-B114-4843-9A35-46F5CFC785F2}.Release|Any CPU.ActiveCfg = Release|Any CPU
{FB01A0D9-B114-4843-9A35-46F5CFC785F2}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
EndGlobal

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QMPSharp/QMPClient.cs Normal file
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using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;
namespace QMPSharp;
public class QMPClient : IDisposable
{
public event EventHandler Disconnected;
public event EventHandler<QMPEvent> QMPEventReceived;
public bool Disposed => _disposed;
private readonly Socket socket;
private readonly EndPoint remoteEndpoint;
private readonly CancellationTokenSource _tokenSource;
private TaskCompletionSource<object?> QMPWelcome = new();
private TaskCompletionSource<object?> QMPCapabilitiesNegotiated = new();
private bool _disposed = false;
private bool ready = false;
private bool connected = false;
private int _lastId = -1;
private Dictionary<int, TaskCompletionSource<JsonObject>> _pendingCommands = new();
public QMPClient(Socket socket, EndPoint remoteEndpoint)
{
_tokenSource = new CancellationTokenSource();
this.socket = socket;
this.remoteEndpoint = remoteEndpoint;
if (socket.Connected)
{
throw new ArgumentException("QMPClient requires a socket that is not connected", nameof(socket));
}
Disconnected += delegate { };
QMPEventReceived += delegate { };
}
public async Task ConnectAsync()
{
if (this._disposed)
{
throw new ObjectDisposedException(nameof(QMPClient));
}
if (ready)
{
throw new InvalidOperationException("The QMP client is already connected");
}
await socket.ConnectAsync(remoteEndpoint);
connected = true;
new Thread(async () => await ReceiveLoop(Thread.CurrentThread)).Start();
await QMPWelcome.Task;
var json = new JsonObject();
json.Add("execute", "qmp_capabilities");
await SendAsync(json);
await QMPCapabilitiesNegotiated.Task;
ready = true;
return;
}
public void Dispose()
{
if (_disposed)
{
return;
}
_disposed = true;
_tokenSource.Cancel();
socket.Close();
socket.Dispose();
}
public async Task SendAsync(JsonObject json)
{
if (this._disposed)
{
throw new ObjectDisposedException(nameof(QMPClient));
}
var jsonBytes = JsonSerializer.SerializeToUtf8Bytes(json);
await socket.SendAsync(jsonBytes, SocketFlags.None);
}
public async Task<JsonObject> ExecuteAsync(string command, JsonObject? args = null)
{
if (this._disposed)
{
throw new ObjectDisposedException(nameof(QMPClient));
}
if (!ready)
{
throw new InvalidOperationException("The QMP client is not ready");
}
JsonObject json = new();
var id = _lastId + 1;
_lastId = id;
json.Add("execute", command);
if (args is not null)
{
json.Add("arguments", args);
}
json.Add("id", id);
var tcs = new TaskCompletionSource<JsonObject>();
_pendingCommands.Add(id, tcs);
await SendAsync(json);
var res = await tcs.Task;
_pendingCommands.Remove(id);
return res;
}
public Task Reboot() => ExecuteAsync("system_reset");
public Task Shutdown() => ExecuteAsync("system_powerdown");
public Task Resume() => ExecuteAsync("cont");
public async Task<string> HumanMonitorCommand(string cmd)
{
var res = await ExecuteAsync("human-monitor-command", new JsonObject { { "command-line", cmd } });
return res["return"].GetValue<string>();
}
private async Task ProcessMessage(JsonNode json)
{
if (!(json is JsonObject obj))
{
return;
}
if (!ready)
{
if (obj.ContainsKey("QMP"))
{
QMPWelcome.TrySetResult(null);
return;
}
if (obj.ContainsKey("return"))
{
QMPCapabilitiesNegotiated.TrySetResult(null);
}
}
if (obj.ContainsKey("id"))
{
var id = obj["id"].GetValue<int>();
if (_pendingCommands.TryGetValue(id, out var tcs))
{
tcs.TrySetResult(obj);
}
}
if (obj.ContainsKey("event"))
{
var ev = obj["event"].GetValue<string>();
var data = obj["data"];
var seconds = obj["timestamp"]["seconds"].GetValue<uint>();
var microseconds = obj["timestamp"]["microseconds"].GetValue<uint>();
QMPEventReceived.Invoke(this, new QMPEvent
{
Event = ev,
Data = (JsonObject)data,
Seconds = seconds,
Microseconds = microseconds
});
}
}
private async Task ReceiveLoop(Thread eventThread)
{
var buffer = new byte[4096];
while (!_tokenSource.Token.IsCancellationRequested)
{
int read;
using var ms = new MemoryStream();
do
{
try
{
read = await socket.ReceiveAsync(buffer);
}
catch (Exception ex) when (ex is SocketException or ObjectDisposedException)
{
OnDisconnect();
return;
}
ms.Write(buffer, 0, read);
if (read == 0)
{
OnDisconnect();
return;
}
} while (read >= buffer.Length);
var raw = Encoding.UTF8.GetString(ms.ToArray());
foreach (var s in raw.Split('\n'))
{
if (s == "") break;
var json = JsonSerializer.Deserialize<JsonNode>(s);
if (json is null)
{
continue;
}
ProcessMessage(json);
}
}
}
private void OnDisconnect()
{
Disconnected.Invoke(this, new());
Dispose();
}
}

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using System.Text.Json.Nodes;
namespace QMPSharp;
public class QMPEvent
{
public string Event { get; set; }
public JsonObject Data { get; set; }
public uint Seconds { get; set; }
public uint Microseconds { get; set; }
}

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QMPSharp/QMPException.cs Normal file
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namespace QMPSharp;
public class QMPException : Exception
{
public QMPException(string message) : base(message)
{
}
}

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QMPSharp/QMPSharp.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>

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# QMPSharp
A QEMU Machine Protocol client for .NET