SCP Problem

[David A. Bandel]

On 10/26/07, Kurt Wall <kwall at kurtwerks.com> wrote:
> On Fri, Oct 26, 2007 at 09:26:18AM -0700, Bill Campbell wrote:
> > On Thu, Oct 25, 2007, Kurt Wall wrote:
> > >On Fri, Oct 26, 2007 at 11:34:22AM +1000, james at jamesmcdonald.id.au wrote:
> > >> > On Thu, Oct 25, 2007 at 03:37:56PM +1000, James McDonald wrote:
> > >> >> Kurt Wall wrote:
> > >> >>> Hola, list,
> > >> >
> > >> > [scp broken]
> > >> >
> > >> >> Does sftp work?
> > >> >
> > >> > Nope.
> > >> >
> > >> The reason I ask is that I'm curious if the entire scp / sftp subsytem is
> > >> not configured/enabled on the remote box?
> > >
> > >I'm pretty sure it is because I can ssh to the remote box and then scp
> > >files to and from it. I just can't use scp when the remote system is on
> > >the other end of the transaction.
> >
> > Is it possible that scp is not in the PATH that ssh sees on the
> > remote system?
> >
> > Try ``ssh remote which scp'' or perhaps ``ssh remote echo '$PATH' ''
>
> Interesting result, in that it doesn't work:
>
> $ strace -o strace.out ssh kurtwerks.org which scp
>
> Nothing happens, so I Ctl-C out of the session.  The tail end of the
> strace looks like this:
>
> getsockopt(3, SOL_TCP, TCP_NODELAY, [0], [4]) = 0
> setsockopt(3, SOL_TCP, TCP_NODELAY, [1], 4) = 0
> getsockname(3, {sa_family=AF_INET, sin_port=htons(33961),
> sin_addr=inet_addr("192.168.1.101")}, [16]) = 0
> setsockopt(3, SOL_IP, IP_TOS, [8], 4)   = 0
> select(7, [3], [3], NULL, NULL)         = 1 (out [3])
> write(3, "\267=\rf5\f\335!K\27\200\212\356\367z\16U\2512\6\311y\260"...,
> 128) = 128
> select(7, [3], [], NULL, NULL)          = 1 (in [3])
> read(3, "\260\0\20.O\36\355\f<q\t\2353\324\343D\6\355T\277\277\373"...,
> 8192) = 48
> select(7, [3 4], [], NULL, NULL
>
> So, it's waiting for input on file descriptors 3 and 4. The pid is
> 23328, so:
>
> $ ls -l /proc/23328/fd/
> lrwx------ 1 kwall kwall 64 2007-10-26 22:26 0 -> /dev/pts/2
> lrwx------ 1 kwall kwall 64 2007-10-26 22:26 1 -> /dev/pts/2
> lrwx------ 1 kwall kwall 64 2007-10-26 22:26 2 -> /dev/pts/2
> lrwx------ 1 kwall kwall 64 2007-10-26 22:26 3 -> socket:[117451]
> lrwx------ 1 kwall kwall 64 2007-10-26 22:26 4 -> /dev/pts/2
> lrwx------ 1 kwall kwall 64 2007-10-26 22:26 5 -> /dev/pts/2
> lrwx------ 1 kwall kwall 64 2007-10-26 22:26 6 -> /dev/pts/2
>
> Just for giggles, I tried the same thing from another system (a BSD
> system at work) and got the same result.
>
> As before, though, plain vanilla SSH works just fine.
>
> Very strange.
>

It is.   I just scp'd some files from my Linux system to an OpenBSD
box and back w/ no problem.  On the BSD box, are you working as a user
or as root?  If not root, can you try as  root -- perhaps permissions
problems?

Ciao,

David A. Bandel
-- 
Focus on the dream, not the competition.
            - Nemesis Air Racing Team motto