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Interop.cs
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Interop.cs
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using System.Runtime.InteropServices;
using Spectre.Console;
namespace VmChamp;
[StructLayout(LayoutKind.Sequential)]
public unsafe struct VirDomainIpAddress
{
public int type;
[MarshalAs(UnmanagedType.LPUTF8Str)] public byte* addr;
public uint prefix;
}
[StructLayout(LayoutKind.Sequential)]
public unsafe struct VirDomainInterface
{
public byte* name;
public byte* hwaddr;
public uint naddrs;
public VirDomainIpAddress* addrs;
}
[StructLayout(LayoutKind.Sequential)]
public struct VirDomainInfo
{
public byte state;
public long maxMem;
public long memory;
public ushort nrVirtCpu;
public ulong cpuTime;
}
public struct VirDomainBlockInfo
{
public ulong capacity;
public ulong allocation;
public ulong physical;
}
enum VirDomainState
{
NoState = 0,
Running = 1,
Blocked = 2,
Paused = 3,
Shutdown = 4,
Shutoff = 5,
Crashed = 6,
Suspended = 7,
Last = 8
}
public static unsafe class Interop
{
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virDomainInterfaceAddresses")]
public static extern nint virDomainInterfaceAddresses(IntPtr dom,
VirDomainInterface*** ifaces,
uint source,
uint flags = 0);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virDomainCreateXML")]
public static extern nint virDomainCreateXML(IntPtr conn,
string xmlDesc,
uint flags);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virConnectOpen")]
public static extern nint virConnectOpen(string name);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virConnectClose")]
public static extern nint virConnectClose(nint conn);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virDomainLookupByName")]
public static extern nint virDomainLookupByName(nint conn, string name);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virDomainDestroy")]
public static extern int virDomainDestroy(nint domain);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virDomainGetInfo")]
public static extern int virDomainGetInfo(nint domain, VirDomainInfo* info);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virDomainGetBlockInfo")]
public static extern int virDomainGetBlockInfo(nint domain, string disk, VirDomainBlockInfo* info, uint flags = 0);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virDomainReset")]
public static extern int virDomainReset(nint domain, uint flags = 0);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virNetworkCreateXML")]
public static extern nint virNetworkCreateXML(nint conn, string xml);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virNetworkLookupByName")]
public static extern nint virNetworkLookupByName(nint conn, string name);
[DllImport("libvirt.so.0",
CallingConvention = CallingConvention.Cdecl,
EntryPoint = "virNetworkDestroy")]
public static extern int virNetworkDestroy(nint network);
public static string? GetFirstIpById(nint id)
{
VirDomainInterface** ifaces = null;
var n = Interop.virDomainInterfaceAddresses(id, &ifaces, 2);
if (n <= 0 || ifaces == null)
return null;
var virDomainIpAddress = ifaces[0]->addrs[0];
var ip = Marshal.PtrToStringUTF8((nint)virDomainIpAddress.addr);
return ip;
}
public static bool IsLibvirtInstalled()
{
NativeLibrary.TryLoad("libvirt.so.0", out var handle);
return handle != IntPtr.Zero;
}
public static void DestroyVm(nint vmId, string vmName, string vmDir)
{
AnsiConsole.MarkupLine($"[yellow]💀 Removing VM: {vmName}[/]");
if(Interop.virDomainDestroy(vmId) != 0)
{
AnsiConsole.MarkupLine($"[red]Error removing VM: {vmName}[/]");
}
if (Directory.Exists(vmDir))
{
Directory.Delete(vmDir, true);
}
}
public static string GenVirBridgeXml(string name, string ip, string mask, string dhcpStart, string dhcpEnd)
{
return $"""
<network>
<name>default</name>
<bridge name='{name}'/>
<forward/>
<ip address='{ip}' netmask='{mask}'>
<dhcp>
<range start='{dhcpStart}' end='{dhcpEnd}'/>
</dhcp>
</ip>
</network>
""";
}
}
public class LibvirtConnection : IDisposable
{
private readonly nint _ptr;
public nint NativePtr => _ptr;
public bool IsValid => this._ptr != nint.Zero;
private LibvirtConnection(nint ptr)
{
_ptr = ptr;
}
public static LibvirtConnection CreateForSession()
{
return Create("qemu:///session");
}
public static LibvirtConnection CreateForSystem()
{
return Create("qemu:///system");
}
private static LibvirtConnection Create(string target)
{
var ptr = Interop.virConnectOpen(target);
if (ptr == nint.Zero)
{
throw new ArgumentException($"Cannot connect to: {target}");
}
return new LibvirtConnection(ptr);
}
public void Dispose()
{
if (this.IsValid)
{
Interop.virConnectClose(_ptr);
}
}
}