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I am trying to encrypt a file on-the-fly, redirecting the output to a named pipe [fifo]. I SSH into my server and run the command:
$ mcrypt -k key < file > named_pipe
then from my laptop I try to scp it:
$ scp me@server:~/dir/named_pipe
and it says
scp: /users/home/me/dir/named_pipe: not a regular file
Is there any way to do this? Thanks
Matt
Posted 2011-08-02T01:01:12.947
Reputation: 627
4
Stream from it instead.
ssh me@server cat ~/dir/named_pipe > file.out
Ignacio Vazquez-Abrams
Posted 2011-08-02T01:01:12.947
Reputation: 100 516
I am currently using a server that limits me to scp. Being able to trick scp into transferring the contents of a named pipe, so that I can transfer huge files without buffering them, would be a huge win for me. – Witiko – 2017-06-03T09:14:53.523
~ is resolving to my local home directory instead of the remote one. – peter – 2017-12-01T09:12:44.457
So I finally got around to trying it out: this is what I get: Bus error: 10 (core dumped).. from mcrypt, and the "> file" file is emtpy. – Matt – 2011-08-06T02:26:04.333
Try streaming from the named pipe locally to see if mcrypt invokes a bus error even then. – Ignacio Vazquez-Abrams – 2011-08-06T02:57:31.740
Good call. I try it on a big file [900MB] and it seems to just sit there doing nothing [output being blank] So created a 5MB file from /dev/urandom, and tried encrypting to a regular file [no fifo]. And it invokes the bus error. :\ I try it on my local Ubuntu machine and it works fine. Maybe it's this server or freebsd? :\ Do you of any encryption program to output to stdout? – Matt – 2011-08-06T13:16:33.157
Unfortunately command-line encryption is not my forte; I usually leave that to GnuPG or OpenSSL. – Ignacio Vazquez-Abrams – 2011-08-06T17:38:52.937
Turns out, I don't need this anymore. However, your answer would have worked if mcrypt would work. :) – Matt – 2011-08-06T23:20:47.807
I would assume that
scpcopies file content. A named pipe is not a physical file, hencescpwon't try to copy it (try copying/dev/random, for example). Just redirect to a file, or find a way to tunnel the data to your laptop. – new123456 – 2011-08-02T01:28:34.473