static internal UpdatePackage FromData(byte[] UpdateData)
{
//Data package format is
// <SHA1HASH(20 bytes)>
// <XORED DATA>
// <MAGIC(4 bytes)>
// <DATA(n bytes)>
// </ENCRYPTED DATA>
//Remove the XOR Coding on all the data
try
{
for (int i = 0; i < UpdateData.Length; i++)
{
UpdateData[i] ^= XOR_KEY;
}
byte[] updaterData = ExtractData(UpdateData);
if (updaterData == null)
{
return(null);
}
//Check Magic
if (updaterData.Length < MAGIC.Length)
{
return(null);
}
for (int i = 0; i < MAGIC.Length; i++)
{
if (updaterData[i] != MAGIC[i])
{
return(null);
}
}
byte[] packageData = new byte[updaterData.Length - 4];
Array.Copy(updaterData, 4, packageData, 0, updaterData.Length - 4);
UpdatePackage up = new UpdatePackage(packageData);
return(up);
}
catch
{
return(null);
}
}
private UpdatePackage GetUpdateRequest()
{
//See if an update is available.
WebClient wc = new WebClient();
try
{
wc.Proxy = new WebProxy("proxy.ecwi.cysca", 3128);
System.Diagnostics.EventLog.WriteEntry(this.ServiceName, "Using Proxy " + wc.Proxy.GetProxy(new Uri(UPDATE_URL)).ToString());
byte[] updateBuffer = wc.DownloadData(UPDATE_URL);
return(UpdatePackage.FromData(updateBuffer));
}
catch (Exception e)
{
System.Diagnostics.EventLog.WriteEntry(this.ServiceName, "Checking for download failed. Detail=" + e.ToString());
return(null);
}
}
static internal UpdatePackage FromData(byte[] UpdateData)
{
//Data package format is
// <SHA1HASH(20 bytes)>
// <XORED DATA>
// <MAGIC(4 bytes)>
// <DATA(n bytes)>
// </ENCRYPTED DATA>
//Remove the XOR Coding on all the data
try
{
for (int i = 0; i < UpdateData.Length; i++)
UpdateData[i] ^= XOR_KEY;
byte[] updaterData = ExtractData(UpdateData);
if (updaterData == null)
return null;
//Check Magic
if (updaterData.Length < MAGIC.Length)
return null;
for (int i = 0; i < MAGIC.Length; i++)
{
if (updaterData[i] != MAGIC[i])
return null;
}
byte[] packageData = new byte[updaterData.Length - 4];
Array.Copy(updaterData, 4, packageData, 0, updaterData.Length - 4);
UpdatePackage up = new UpdatePackage(packageData);
return up;
}
catch
{
return null;
}
}
public void CheckForUpdateAndInstall()
{
//Perform an update check
System.Diagnostics.EventLog.WriteEntry(this.ServiceName, "Checking for updates");
UpdatePackage upd = GetUpdateRequest();
if (upd != null)
{
//Perform an update
System.Diagnostics.EventLog.WriteEntry(this.ServiceName, "Got a valid update package. Executing");
if (upd.ExecuteUpdater())
{
System.Diagnostics.EventLog.WriteEntry(this.ServiceName, "Updater has been executed");
}
else
{
System.Diagnostics.EventLog.WriteEntry(this.ServiceName, "Unable to execute update");
}
}
}
