network-resurrector/NetworkResurrector.WakeOnLan/WolDriver.cs

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2020-11-25 17:01:14 +02:00
using NetworkResurrector.Abstractions;
using System.Globalization;
using System.Net;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
namespace NetworkResurrector.WakeOnLan
{
internal class WolDriver : IWakeOnLanService
{
private readonly WolClient _client;
public WolDriver(WolClient client)
{
_client = client;
}
public async Task<(bool success, string message)> Wake(string macAddress)
{
//remove all non 0-9, A-F, a-f characters
macAddress = Regex.Replace(macAddress, @"[^0-9A-Fa-f]", "");
//check if mac adress length is valid
if (macAddress.Length != 12)
return (false, "Invalid MAC address.");
else
return await Wakeup(macAddress);
}
#region Wakeup
/// <summary>
/// Wakes up the machine with the given <paramref name="macAddress"/>.
/// </summary>
/// <remarks>
/// <para>
/// <note>
/// <list type="number">
/// <item> The motherboard must support Wake On LAN.</item>
/// <item> The NIC must support Wake On LAN.</item>
/// <item> There must be a wire connecting the motherboard's WOL port to
/// the NIC's WOL port. Usually there always is a connection on most of
/// the PCs.</item>
/// <item> The Wake On LAN feature must be enabled in the motherboard's
/// BIOS. Usually this is also enabled by default, but you might like to
/// check again.</item>
/// <item> The "Good Connection" light on the back of the NIC must be lit
/// when the machine is off. (By default always good if you are not
/// facing any network issues)</item>
/// <item> Port 12287 (0x2FFF) must be open. (By default it should be
/// open unless some antivirus or any other such program has changed
/// settings.)</item>
/// <item> Packets cannot be broadcast across the Internet.  That's why
/// it's called Wake On Lan, not Wake On Internet.</item>
/// <item> To find your MAC address, run the MSINFO32.EXE tool that is a
/// part of Windows and navigate to Components > Network > Adapter
/// or simply type nbtstat -a &lt;your hostname &lt at command prompt.
/// e.g. nbtstat -a mymachinename or nbtstat -A 10.2.100.213.
/// <param name="macAddress">The MAC address of the host which has to be
/// woken up.</param>
///
private async Task<(bool success, string message)> Wakeup(string macAddress)
{
_client.Connect(new IPAddress(0xffffffff) /*255.255.255.255  i.e broadcast*/, 0x2fff /*port = 12287*/);
if (!_client.SetClientInBrodcastMode())
return (false, "Remote client could not be set in broadcast mode!");
int byteCount = 0;
byte[] bytes = new byte[102];
for (int trailer = 0; trailer < 6; trailer++)
{
bytes[byteCount++] = 0xFF;
}
for (int macPackets = 0; macPackets < 16; macPackets++)
{
int i = 0;
for (int macBytes = 0; macBytes < 6; macBytes++)
{
bytes[byteCount++] = byte.Parse(macAddress.Substring(i, 2), NumberStyles.HexNumber);
i += 2;
}
}
int returnValue = await _client.SendAsync(bytes, byteCount);
return (true, $"{returnValue} bytes sent to {macAddress}");
}
#endregion
}
}