Question

I’m using Jsch 0.1.44 to scp a file from one host to another. The relevant code is the following:

public boolean transferFileToHost(File fileToTransfer, String destDirectory, String destFilename) {
    Channel channel = null;
    try {
        String command = "scp -t "+ destDirectory + destFilename;
        channel = session.openChannel("exec");
        ((ChannelExec)channel).setCommand(command);

        OutputStream out = channel.getOutputStream();
        InputStream in = channel.getInputStream();

        if(!connectToChannel(channel, in)) {
            return false; 
        }

        if(!sendScpCommand(fileToTransfer, command, out, in)) {
            return false;
        }

        if(!sendFileContent(out, fileToTransfer, in)) {
            return false;
        }

        return true;
    } catch (IOException e) {
        logger.error("Error while reading file. Error was: ",e);
    } catch (JSchException e) {
        logger.error("Error while sending ssh commands. Error was: ",e);
    } 
    finally {
        if(channel != null) {
            channel.disconnect();
        }
    }

private boolean sendScpCommand(File file, String command, OutputStream out, InputStream in) throws IOException {
    long filesize=file.length();
    command="C0644 "+filesize+" ";
    command+=file;
    command+="\n";

    out.write(command.getBytes());
    out.flush();
    if (checkAck(in) != 0) {
        return false;
    }
    return true;
}

The command in this line

((ChannelExec)channel).setCommand(command);

looks like this: scp -t /tmp/config.xml and the command in this line

out.write(command.getBytes());

looks like this: C0644 5878 /home/myuser/config.xml

The problem is, that I get the following error from scp: scp: error: unexpected filename: /path/to/config.xml

What is the reason for this error? How can I avoid it?

Any help is highly appreciated.

Answer 1

I’ve found a solution. It seems that the source filename in the command must not contain any slashes. To solve this problem you simple have to change this line:

command+=file;

into this:

command+=file.getName();

Thats it.