Pasting via ssh causes data loss
libc.mail at gmail.com
Mon Dec 1 01:21:26 PST 2008
On 1 дек, 05:03, Chris <eaglet... at hughes.net> wrote:
> I was curious about your situation and set up a couple of tests. Noting
> you mentioned iTerm, I thought I might be able to recreate it on a Mac
> (OS-X 10.4 with 1.4.3 (100) version Terminal, I had removed iTerm due
> to unreliability sometime back).
I've downloaded iTerm for this test. I'm using Apple's Terminal.app.
> I copied a 23094 byte program I was working on locally in MacVIM. I
> first did
> a cat >testfile then pasted through an ssh terminal.app connection
> over satellite (very
> bad connection) into a FreeBSD 7.0 box I built in the last month. At
> the far end it received 23094 bytes. sftp of the file to the remote and
> diff showed no differences. I then opened an ssh session to a FreeBSD
> on my local lan and repeated with the same results. No problems.
I believe that FreeBSD fetches all data. When I ssh back to my mac
from FreeBSD, I recieve all data all the time. TCP should handle
so nothing surprising here.
> The problem does not appear to be obvious or common so there must be
> unique about how this situation if you have reproduced it on two
> different terminal programs using ssh that would work correctly to other
> servers using the same shell and collection method (e.g. cat >blah).
I tried zsh, sh, bash and my program on the freebsd box.
> Something missing here. Have you checked if you have
> errors shown on the interface of the server? Are there losses if you
> the files from your machine to the remote (Try pushing a 1.5 MB file and
> see if that shows failures). Did you install something other than the
> OpenSSH on the server? Do the text files have something other than text
> in them or even control sequences for the remote? Just taking
> potshots here.
sftp doesn't lose data. Even cat file | ssh host 'cat >file' doesn't.
It's 100% reproducible, I don't think it's some kind of side effect.
$ netstat -I bge0
Name Mtu Network Address Ipkts Ierrs Opkts
bge0 1500 <Link#1> 00:a0:d1:e3:fd:9c 55134708 0
48858321 0 0
I believe nothing strange was installed on the server... it's a
typical freebsd web-server.
> A somewhat side note here, I would personally never think to move
> files this
> way since it's quite possible that content of files can disrupt the
> I tend to use sftp.
I never do that for binary files. I use sftp either. However, when I
change some source on a server, I already have an opened text editor
with the file and a terminal, in that case cat >file is just quickier.
BTW, thank you for your help, guys...
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