breaking RFC by replying 150 after establishing data connection

[Parijat Bansal]

Hi,

RFC 959 explains 125 and 150 (valid intermediate responses for STOR/RETR) as follows:

125 Data connection already open; transfer starting.
150 File status okay; about to open data connection.

If the data connection is already estabilished and after it the server receives STOR/RETR then it should respond with 125. I connected in passive mode using my custom client to verify this. I first estabilished a data channel and after it only I sent STOR but still got 150 which is wrong.

Following is part of my code :

data = new Socket(pasv_ip, pasv_port);
data_os = data.getOutputStream();
data_is = data.getInputStream();
control_os.print("STOR " + "file.txt" + "\r\n");
System.out.print("---> STOR " + "file.txt" + "\n");
control_os.flush();
System.out.println(control_is.readLine());

However if I tried sending STOR before establishing data channel then Filezilla hanged while other servers were able to handle this scenario.

Regards,
Parijat Bansal

[Tim Kosse]

Does the STOR command appear in the server log?

Plenty of client connect the socket before sending STOR but so far there hasn't been any problem, making me suspect that there might be something wrong with your code.

Can you please post a few more lines from your code?

[Alexander Schuch]

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