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  • Copy from remote folder to remote folder?

    Is there an FTP command like MPUT to copy files from one remote directory to another remote directory?
    I'm thinking of writing a cgi program to do this on a windows server.
    Last edited by Mike Doty; 6 Mar 2008, 01:18 PM.

  • #2
    Originally posted by Mike Doty View Post
    Is there an FTP command like MPUT to copy files from one remote directory to another remote directory?
    I'm thinking of writing a cgi program to do this on a windows server.
    Not in the basic RFC command set. SOME FTP servers will allow this, but most will not. I sure wouldn't do this if you are not in direct control over both FTP servers. If you are, then check the docs for that server as it will tell you what (if any) commands it accepts for server-to-server transfers.
    Software makes Hardware Happen

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    • #3
      Thanks, Joe.

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      • #4
        What you're asking about is known as FXP, and very few servers will permit it. It works by having the client establish two connections, one to the source FTP server and the other to the desination server. On the destination server, the client requests a passive mode transfer, gets the IP address and port number, and issues the STOR command. The destination server is now waiting for the file data to store on the system. On the source server, the client then requests an active mode transfer and specifies the same IP address and port number that was provided by the destination server. The client issues the RETR command, the source server connects back to the destination server, and begins sending the file data.

        This all works when the FTP server allows the PORT command to specify an IP address that is different than that of the client that's connected to it. However, this opens them to an attack known as "FTP bounce" where the FTP server can be exploited as a "middle man" used to scan ports or launch denial-of-service attacks against other servers. In other words, if you permit FXP outside of your own intranet, you're creating a significant security hole that can be exploited to attack others.
        Mike Stefanik
        sockettools.com

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        • #5
          i just got through doing some testing with some programs i have written for tcp file transfers connections. i had placed in the source section of code that will only transfer a file only one way. the client can download and the server uploads. on both computers just place the server and the client.

          the server will only allow for one password but you can run multiple instances of the server with different port number and place a different password in each server.

          the software also lets you set the blocksize to send for tcp transfers, and i have had a problem with large blocksizes going over the internet.

          the code to send to a server was remarked out and untested.

          i have had problems on transfer speeds over the internet but the intranet is fast.

          i may have just resolved my problems with the transfer speeds.
          i am running windows 2000 pro and i have made changes to the tcp parameters in the os.

          i changed the mtu to 1492 and tcp receive windows to 63888, we have dsl connections with pppoe

          the testing was light, but without a problem so far, i was using a block size of 32000 bytes to transfer and there was no glitch, which before i had a problem sending anything above 5000 bytes.
          It reduced the time in half.
          paul

          the programs where written for transferring more than one file at a time but you can run the server on a computer with more than one instance then (divide and conquer) have the client do two or more downloads at the same time running multiple instances of the client.

          i did not want the client to send a file, because i did not what the client to write over a good file on the server and i have remote control software where i can go to the server and initiate a download using the same software.
          p purvis

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          • #6
            That isn't quite what I had in mind, but I will definitely look at it, thanks!
            I got to work using cgi, but wouldn't exactly recommend it to others.

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            • #7
              how about rename?

              Do you want to copy or move?

              If move, you might try rename command including the path,
              assuming it's on the same remote server.

              example

              ren folder1/file1.htm folder2/file2.htm

              This is usually very fast, because the file is not moved,
              the directory info is just updated.

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              • #8
                Well, if you can't just issue a "rename" , I recently added the upload to this demo here...

                WinInet FTP Upload (Overwrite or Append) Demo 3-10-08

                .. so you could download (using post #1, the original, from which I shamelessly copied) from the source directory to your local PC, then upload (using post #2) to the destination directory.
                Michael Mattias
                Tal Systems (retired)
                Port Washington WI USA
                [email protected]
                http://www.talsystems.com

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