Identify failed file transfers during SFTP Post: 302909428

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Top Forums Shell Programming and Scripting Identify failed file transfers during SFTP Post 302909428 by Aviktheory11 on Thursday 17th of July 2014 12:17:44 AM

07-17-2014

Registered User

Quote:

Originally Posted by achenle

Why not just use scp?

Run it for each file and check the exit code, log errors as appropriate.

Hi achenle, as I've said in my first thread, using SFTP is a business requirement, and we can't help abiding by that.

Quote:

Originally Posted by rbatte1

Welcome Aviktheory11,

Your sftp session is not a normal shell session for running commands remotely so it is a little awkward. You command below

Code:

!md5sum * > chklist.md5

will run on the local server, so I'm not sure that is what you really want.

If you were using plain ftp then you would get a zero return code if the connection opened and you had to resort to switching on flags to get more verbose output that can be captured in a log file and read afterwards. sftp on the other hand is better with errors. Could you do something like the following instead?:-

Code:

#!/bin/bash
. ./params # parameter file

cd output

errcnt=0
for file in T_PROD*
do
   sftp ${FTPUSER}@${FTPSERVER} << EOF
      cd $FTPFOLDER
      put $file
        EOF
# Note not an indentation with spaces on previous line.  Used tab for clarity.
   if [ $? -ne 0 ]
   then
      printf "Something went wrong with file \"$file\"\n"
      ((errcnt=$errcnt+1))
   else
      printf "File \"$file\" send successfully.\n"
   fi
done

if [ $errcnt -ne 0 ]
then
   printf "ERROR in $errcnt transfers!\n"
done

Thanks for the help rbatte1. However, will just checking the return code of sftp ensure the correct transfer of files ? I'm dealing with file transfer things just recently [that's why I've used the md5sum, din't realise it worked only locally], and I believe the return code is 0 even if a file was transferred partially. Please correct me if I'm wrong.

I'll try out your suggestion though. Thanks a lot for the help again !!!

- Best,

Avik

Aviktheory11

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LEARN ABOUT SUSE

sftp-server

SFTP-SERVER(8)						    BSD System Manager's Manual 					    SFTP-SERVER(8)

NAME

     sftp-server -- SFTP server subsystem

SYNOPSIS

     sftp-server [-ehR] [-f log_facility] [-l log_level] [-u umask]

DESCRIPTION

     sftp-server is a program that speaks the server side of SFTP protocol to stdout and expects client requests from stdin.  sftp-server is not
     intended to be called directly, but from sshd(8) using the Subsystem option.

     Command-line flags to sftp-server should be specified in the Subsystem declaration.  See sshd_config(5) for more information.

     Valid options are:

     -e      Causes sftp-server to print logging information to stderr instead of syslog for debugging.

     -f log_facility
	     Specifies the facility code that is used when logging messages from sftp-server.  The possible values are: DAEMON, USER, AUTH,
	     LOCAL0, LOCAL1, LOCAL2, LOCAL3, LOCAL4, LOCAL5, LOCAL6, LOCAL7.  The default is AUTH.

     -h      Displays sftp-server usage information.

     -l log_level
	     Specifies which messages will be logged by sftp-server.  The possible values are: QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1,
	     DEBUG2, and DEBUG3.  INFO and VERBOSE log transactions that sftp-server performs on behalf of the client.	DEBUG and DEBUG1 are
	     equivalent.  DEBUG2 and DEBUG3 each specify higher levels of debugging output.  The default is ERROR.

     -R      Places this instance of sftp-server into a read-only mode.  Attempts to open files for writing, as well as other operations that
	     change the state of the filesystem, will be denied.

     -u umask
	     Sets an explicit umask(2) to be applied to newly-created files and directories, instead of the user's default mask.

     For logging to work, sftp-server must be able to access /dev/log.	Use of sftp-server in a chroot configuration therefore requires that
     syslogd(8) establish a logging socket inside the chroot directory.

SEE ALSO

     sftp(1), ssh(1), sshd_config(5), sshd(8)

     T. Ylonen and S. Lehtinen, SSH File Transfer Protocol, draft-ietf-secsh-filexfer-00.txt, January 2001, work in progress material.

HISTORY

     sftp-server first appeared in OpenBSD 2.8.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								  January 9, 2010							       BSD

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