Banner causes scp to fail from script but not command line.
Hi,
We have an interesting issue which is similar to the one in this thread, but that never provided a full answer. - Ohh apparently I can't post URLs till I have 5 posts, sorry.
We have a simple script that copies files from one shelf to the other. Both shelves have an ssh banner defined. When I run the script the scp to the remote shelf fails however if does not when the same command is run from the command line. When I pipe the output to a file, the error output displays the banner from the remote shelf.
Piping the error output to a file solves the problem and the scp works fine, however I don't understand why and I was wondering if anyone could explain. We have quite a few places in the code where the output is not currently piped to /dev/null (stderr) and I really want to understand the cause of the problem so that I know whether I need to correct all of them or just ones in certain formats/shells or indeed if it is a config problem?
The code I am running is as follows (I have removed any parts that could be company sensitive (e.g. <remote shelf ip> if not the actual code in this line but does work):
Code:
#!/usr/bin/ksh
VP3_REMOTE_SHELF_IP=`<remote shelf ip>`
/opt/OBSDssh/bin/ssh -n -o 'BatchMode yes' $VP3_REMOTE_SHELF_IP "rm -r -f /tmp/ms_passwd"
/opt/OBSDssh/bin/ssh -n -o 'BatchMode yes' $VP3_REMOTE_SHELF_IP "mkdir /tmp/ms_passwd"
#SCP1 - this works
/opt/OBSDssh/bin/scp -o 'BatchMode yes' /etc/shadow $VP3_REMOTE_SHELF_IP:/tmp/ms_passwd/ > /dev/null 2>&1
#SCP2 - this does not work - the error output has to be piped away as well to make it work.
/opt/OBSDssh/bin/scp -v -o 'BatchMode yes' /etc/passwd $VP3_REMOTE_SHELF_IP:/tmp/ms_passwd/ > /tmp/passwd
.....
When I run the scp with the -v option, this is the output I get (fjmfjf is the remote shelf banner - a pretty rubbish banner I'll admit, it has been like that for years though):
Code:
Executing: program /opt/OBSDssh/bin/ssh host <IP> user (unspecified), command scp -v -t /tmp/ms_passwd
OpenSSH_3.9p1, OpenSSL 0.9.7d 17 Mar 2004
debug1: Reading configuration data /etc/ssh_config
debug1: Connecting to <remote IP> [<remote IP>] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/1
debug1: identity file /etc/ssh_host_rsa_key type 1
debug1: Remote protocol version 2.0, remote software version OpenSSH_3.9p1
debug1: match: OpenSSH_3.9p1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.9p1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '<remote IP>' is known and matches the RSA host key.
debug1: Found key in /.ssh/known_hosts:5
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
fjmfjf
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering public key: /etc/ssh_host_rsa_key
debug1: Server accepts key: pkalg ssh-rsa blen 149
debug1: read PEM private key done: type RSA
debug1: Authentication succeeded (publickey).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: Sending command: scp -v -t /tmp/ms_passwd
Sending file modes: C0644 569 passwd
Sink: C0644 569 passwd
ebug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: channel 0: free: client-session, nchannels 1
debug1: fd 0 clearing O_NONBLOCK
debug1: fd 1 clearing O_NONBLOCK
debug1: Transferred: stdin 0, stdout 0, stderr 0 bytes in 0.3 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.0
If anyone could through some light on why this is happening it would be greatly appreciated. From my google investigations, I think it is something to do with the banner text being incorporated into the ssh command but that's about it.
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I am using
Linux xcclx0619.target.com 2.6.18-308.11.1.el5xen #1 SMP Fri Jun 15 16:19:17 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux (1 Reply)
08-02-2011
