/// <summary>
/// Opens the specified type of active data stream
/// </summary>
/// <param name="type"></param>
protected override void Open(FtpDataChannelType type)
{
string ipaddress = null;
int port = 0;
this.Socket.Bind(new IPEndPoint(((IPEndPoint)this.ControlConnection.LocalEndPoint).Address, 0));
this.Socket.Listen(1);
ipaddress = ((IPEndPoint)this.Socket.LocalEndPoint).Address.ToString();
port = ((IPEndPoint)this.Socket.LocalEndPoint).Port;
try {
this.ControlConnection.LockControlConnection();
switch (type)
{
case FtpDataChannelType.ExtendedActive:
this.ControlConnection.Execute("EPRT |1|{0}|{1}|", ipaddress, port);
if (this.ControlConnection.ResponseType == FtpResponseType.PermanentNegativeCompletion)
{
this.ControlConnection.RemoveCapability(FtpCapability.EPSV);
this.ControlConnection.RemoveCapability(FtpCapability.EPRT);
this.ControlConnection.Execute("PORT {0},{1},{2}",
ipaddress.Replace(".", ","), port / 256, port % 256);
type = FtpDataChannelType.Active;
}
break;
case FtpDataChannelType.Active:
this.ControlConnection.Execute("PORT {0},{1},{2}",
ipaddress.Replace(".", ","), port / 256, port % 256);
break;
default:
throw new Exception("Active streams do not support " + type.ToString());
}
if (!this.ControlConnection.ResponseStatus)
{
throw new FtpCommandException(this.ControlConnection);
}
}
finally {
this.ControlConnection.UnlockControlConnection();
}
}
/// <summary>
/// Opens the specified type of active data stream
/// </summary>
/// <param name="type"></param>
protected override void Open(FtpDataChannelType type) {
string ipaddress = null;
int port = 0;
this.Socket.Bind(new IPEndPoint(((IPEndPoint)this.ControlConnection.LocalEndPoint).Address, 0));
this.Socket.Listen(1);
ipaddress = ((IPEndPoint)this.Socket.LocalEndPoint).Address.ToString();
port = ((IPEndPoint)this.Socket.LocalEndPoint).Port;
try {
this.ControlConnection.LockControlConnection();
switch(type) {
case FtpDataChannelType.ExtendedActive:
this.ControlConnection.Execute("EPRT |1|{0}|{1}|", ipaddress, port);
if(this.ControlConnection.ResponseType == FtpResponseType.PermanentNegativeCompletion) {
this.ControlConnection.RemoveCapability(FtpCapability.EPSV);
this.ControlConnection.RemoveCapability(FtpCapability.EPRT);
this.ControlConnection.Execute("PORT {0},{1},{2}",
ipaddress.Replace(".", ","), port / 256, port % 256);
type = FtpDataChannelType.Active;
}
break;
case FtpDataChannelType.Active:
this.ControlConnection.Execute("PORT {0},{1},{2}",
ipaddress.Replace(".", ","), port / 256, port % 256);
break;
default:
throw new Exception("Active streams do not support " + type.ToString());
}
if(!this.ControlConnection.ResponseStatus) {
throw new FtpCommandException(this.ControlConnection);
}
}
finally {
this.ControlConnection.UnlockControlConnection();
}
}
/// <summary>
/// Open the specified type of passive stream
/// </summary>
/// <param name="type"></param>
protected override void Open(FtpDataChannelType type)
{
Match m = null;
string host = null;
int port = 0;
try {
this.ControlConnection.LockControlConnection();
switch (type)
{
case FtpDataChannelType.ExtendedPassive:
this.ControlConnection.Execute("EPSV");
if (this.ControlConnection.ResponseType == FtpResponseType.PermanentNegativeCompletion)
{
// fall back to PASV if EPSV fails
this.ControlConnection.RemoveCapability(FtpCapability.EPSV);
this.ControlConnection.RemoveCapability(FtpCapability.EPRT);
this.ControlConnection.Execute("PASV");
type = FtpDataChannelType.Passive;
}
break;
case FtpDataChannelType.Passive:
this.ControlConnection.Execute("PASV");
break;
default:
throw new Exception("Passive streams do not support " + type.ToString());
}
if (!this.ControlConnection.ResponseStatus)
{
throw new FtpCommandException(this.ControlConnection);
}
if (type == FtpDataChannelType.Passive)
{
m = Regex.Match(this.ControlConnection.ResponseMessage,
"([0-9]+),([0-9]+),([0-9]+),([0-9]+),([0-9]+),([0-9]+)");
if (!m.Success || m.Groups.Count != 7)
{
throw new FtpException(string.Format("Malformed PASV response: {0}", this.ControlConnection.ResponseMessage));
}
host = string.Format("{0}.{1}.{2}.{3}", m.Groups[1].Value,
m.Groups[2].Value, m.Groups[3].Value, m.Groups[4].Value);
port = (int.Parse(m.Groups[5].Value) << 8) + int.Parse(m.Groups[6].Value);
}
else if (type == FtpDataChannelType.ExtendedPassive)
{
// according to RFC 2428, EPSV response must be exactly the
// the same as EPRT response except the first two fields MUST BE blank
// so that leaves us with (|||port_here|)
m = Regex.Match(this.ControlConnection.ResponseMessage, @"\(\|\|\|(\d+)\|\)");
if (!m.Success)
{
throw new FtpException("Failed to get the EPSV port from: " + this.ControlConnection.ResponseMessage);
}
host = this.ControlConnection.Server;
port = int.Parse(m.Groups[1].Value);
}
this.Socket.Connect(host, port);
}
finally {
this.ControlConnection.UnlockControlConnection();
}
}
/// <summary>
/// Open the specified type of passive stream
/// </summary>
/// <param name="type"></param>
protected override void Open(FtpDataChannelType type) {
Match m = null;
string host = null;
int port = 0;
try {
this.ControlConnection.LockControlConnection();
switch(type) {
case FtpDataChannelType.ExtendedPassive:
this.ControlConnection.Execute("EPSV");
if(this.ControlConnection.ResponseType == FtpResponseType.PermanentNegativeCompletion) {
// fall back to PASV if EPSV fails
this.ControlConnection.RemoveCapability(FtpCapability.EPSV);
this.ControlConnection.RemoveCapability(FtpCapability.EPRT);
this.ControlConnection.Execute("PASV");
type = FtpDataChannelType.Passive;
}
break;
case FtpDataChannelType.Passive:
this.ControlConnection.Execute("PASV");
break;
default:
throw new Exception("Passive streams do not support " + type.ToString());
}
if(!this.ControlConnection.ResponseStatus) {
throw new FtpCommandException(this.ControlConnection);
}
if(type == FtpDataChannelType.Passive) {
m = Regex.Match(this.ControlConnection.ResponseMessage,
"([0-9]+),([0-9]+),([0-9]+),([0-9]+),([0-9]+),([0-9]+)");
if(!m.Success || m.Groups.Count != 7) {
throw new FtpException(string.Format("Malformed PASV response: {0}", this.ControlConnection.ResponseMessage));
}
host = string.Format("{0}.{1}.{2}.{3}", m.Groups[1].Value,
m.Groups[2].Value, m.Groups[3].Value, m.Groups[4].Value);
port = (int.Parse(m.Groups[5].Value) << 8) + int.Parse(m.Groups[6].Value);
}
else if(type == FtpDataChannelType.ExtendedPassive) {
// according to RFC 2428, EPSV response must be exactly the
// the same as EPRT response except the first two fields MUST BE blank
// so that leaves us with (|||port_here|)
m = Regex.Match(this.ControlConnection.ResponseMessage, @"\(\|\|\|(\d+)\|\)");
if(!m.Success) {
throw new FtpException("Failed to get the EPSV port from: " + this.ControlConnection.ResponseMessage);
}
host = this.ControlConnection.Server;
port = int.Parse(m.Groups[1].Value);
}
this.Socket.Connect(host, port);
}
finally {
this.ControlConnection.UnlockControlConnection();
}
}
/// <summary> /// Sets up sockets and executes necessary commands to initalize /// a data transfer. /// </summary> /// <param name="type"></param> protected abstract void Open(FtpDataChannelType type);
/// <summary> /// Sets up sockets and executes necessary commands to initalize /// a data transfer. /// </summary> /// <param name="type"></param> protected abstract void Open(FtpDataChannelType type);