/// <summary>
/// Converts the IP address to a string as required by the PASV command
/// </summary>
/// <returns>The IP address as string</returns>
public override string ToString()
{
var result = new StringBuilder();
if (_isEnhanced)
{
result.Append("|");
if (AddressFamily != null)
{
switch (AddressFamily)
{
case FubarDev.FtpServer.AddressFamily.IPv4:
result.Append("1");
break;
case FubarDev.FtpServer.AddressFamily.IPv6:
result.Append("2");
break;
default:
return(string.Empty);
}
}
result.Append($"|{IpAddress}|{IpPort}|");
}
else
{
result
.Append(IpAddress?.Replace('.', ','))
.Append(',')
.Append(IpPort / 256)
.Append(',')
.Append(IpPort & 0xFF);
}
return(result.ToString());
}
private void GetExternalIpAddress(object o)
{
string module = $"{MethodBase.GetCurrentMethod().Name}()";
// http://www.ipv6proxy.net/ --> "Your IP address : 2600:3c00::f03c:91ff:fe93:dcd4"
try
{
int idx = 0;
foreach (var domain in Domains)
{
try
{
string url = $"{domain}/{DetectionFile}";
string message = $"Fetching external IpAddress from {url} attempt {_retryCount}.{idx++}";
Debug.WriteLine(message);
StartUpTimings.Add(message);
IpAddress = "IpAddress 0.0.0.0";
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
if (request != null)
{
request.UserAgent = "Chem4Word Add-In";
request.Timeout = 2000; // 2 seconds
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
try
{
// Get Server Date header i.e. "Tue, 01 Jan 2019 19:52:46 GMT"
ServerDateHeader = response.Headers["date"];
}
catch
{
// Do Nothing
}
if (HttpStatusCode.OK.Equals(response.StatusCode))
{
using (var reader = new StreamReader(response.GetResponseStream()))
{
string webPage = reader.ReadToEnd();
if (webPage.StartsWith("Your IP address : "))
{
// Tidy Up the data
webPage = webPage.Replace("Your IP address : ", "");
webPage = webPage.Replace("UTC Date : ", "");
webPage = webPage.Replace("<br/>", "|");
webPage = webPage.Replace("<br />", "|");
string[] lines = webPage.Split('|');
#region Detect IPv6
if (lines[0].Contains(":"))
{
string[] ipV6Parts = lines[0].Split(':');
// Must have between 4 and 8 parts
if (ipV6Parts.Length >= 4 && ipV6Parts.Length <= 8)
{
IpAddress = "IpAddress " + lines[0];
IpObtainedFrom = $"IpAddress V6 obtained from {url} on attempt {_retryCount + 1}";
}
}
#endregion Detect IPv6
#region Detect IPv4
if (lines[0].Contains("."))
{
// Must have 4 parts
string[] ipV4Parts = lines[0].Split('.');
if (ipV4Parts.Length == 4)
{
IpAddress = "IpAddress " + lines[0];
IpObtainedFrom = $"IpAddress V4 obtained from {url} on attempt {_retryCount + 1}";
}
}
#endregion Detect IPv4
#region Detect Php UTC Date
if (lines.Length > 1)
{
ServerUtcDateRaw = lines[1];
ServerUtcDateTime = FromPhpDate(lines[1]);
SystemUtcDateTime = DateTime.UtcNow;
UtcOffset = SystemUtcDateTime.Ticks - ServerUtcDateTime.Ticks;
}
#endregion Detect Php UTC Date
// Failure, try next one
if (!IpAddress.Contains("0.0.0.0"))
{
break;
}
}
}
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
StartUpTimings.Add($"GetExternalIpAddress {ex.Message}");
}
Thread.Sleep(500);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
// Something went wrong
IpAddress = "IpAddress 0.0.0.0 - " + ex.Message;
StartUpTimings.Add($"GetExternalIpAddress {ex.Message}");
}
try
{
if (string.IsNullOrEmpty(IpAddress) || IpAddress.Contains("0.0.0.0"))
{
// Try 0..4 times from 0..2 domains
if (_retryCount < 4)
{
// Retry
IncrementRetryCount();
Thread.Sleep(500);
ParameterizedThreadStart pts = GetExternalIpAddress;
Thread thread = new Thread(pts);
thread.SetApartmentState(ApartmentState.STA);
thread.Start(null);
}
else
{
// Failure
IpAddress = IpAddress.Replace("0.0.0.0", "8.8.8.8");
_stopwatch.Stop();
var message = $"{module} took {_stopwatch.ElapsedMilliseconds.ToString("#,000", CultureInfo.InvariantCulture)}ms";
StartUpTimings.Add(message);
Debug.WriteLine(message);
}
}
else
{
// Success
_stopwatch.Stop();
var message = $"{module} took {_stopwatch.ElapsedMilliseconds.ToString("#,000", CultureInfo.InvariantCulture)}ms";
StartUpTimings.Add(message);
Debug.WriteLine(message);
}
}
catch (ThreadAbortException threadAbortException)
{
// Do Nothing
Debug.WriteLine(threadAbortException.Message);
}
}
