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Shell Programming and Scripting
Automating SFTP with Expect
Post 83179 by sysera on Monday 12th of September 2005 09:45:16 AM
09-12-2005
Automating SFTP with Expect
Hello all,
I've written an automated SFTP script to work with the Expect command. It recently occurred to me however, that if the client side box does not have the known host entry for the server, it will not work correctly. So I have added an expect for the known host prompt, and that part works correctly, however, it does not seem to continue past that point to enter the password successfully if the known host file has already been configured for that particular server. I'm assuming I need some sort of timeout for the expect of the known hosts warning, or an if of sorts. I'm not sure how to go about this with expect though. Any help would be great.
Below is my script:
#!/usr/bin/expect
set SYSTEM [lindex $argv 0]
set USER [lindex $argv 1]
set PASSWORD [lindex $argv 2]
set AUTOHOME "/etc/scripts/automation"
set TRIGDIR "/etc/scripts/automation/.engine_triggers"
set CTRIGDIR "/etc/scripts/automation/.client_triggers"
spawn /usr/bin/sftp $USER@$SYSTEM
expect "Are you sure you want to continue connecting (yes/no)?"
send "yes \r"
expect "password:"
send "$PASSWORD \r"
expect "sftp> "
send "put $CTRIGDIR/command $TRIGDIR \r"
expect "sftp> "
send "bye \r"
exit 0
I've written an automated SFTP script to work with the Expect command. It recently occurred to me however, that if the client side box does not have the known host entry for the server, it will not work correctly. So I have added an expect for the known host prompt, and that part works correctly, however, it does not seem to continue past that point to enter the password successfully if the known host file has already been configured for that particular server. I'm assuming I need some sort of timeout for the expect of the known hosts warning, or an if of sorts. I'm not sure how to go about this with expect though. Any help would be great.
Below is my script:#!/usr/bin/expect
set SYSTEM [lindex $argv 0]
set USER [lindex $argv 1]
set PASSWORD [lindex $argv 2]
set AUTOHOME "/etc/scripts/automation"
set TRIGDIR "/etc/scripts/automation/.engine_triggers"
set CTRIGDIR "/etc/scripts/automation/.client_triggers"
spawn /usr/bin/sftp $USER@$SYSTEM
expect "Are you sure you want to continue connecting (yes/no)?"
send "yes \r"
expect "password:"
send "$PASSWORD \r"
expect "sftp> "
send "put $CTRIGDIR/command $TRIGDIR \r"
expect "sftp> "
send "bye \r"
exit 0
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LEARN ABOUT DEBIAN
gesftpserver
gesftpserver(8) System Manager's Manual gesftpserver(8) NAME
gesftpserver - Green End SFTP Server SYNOPSIS
/usr/lib/gesftpserver [OPTIONS] DESCRIPTION
gesftpserver implements the SFTP protocol. It is normally run as an SSH subsystem but can be run in other contexts if necessary. CONFIGURING OPENSSH
By default, OpenSSH will use its native SFTP server in response to requests for the SFTP subsystem. To use gesftpserver instead, add a suitable Subsystem command to sshd_config (and remove the existing one if present). For example: Subsystem sftp /usr/lib/gesftpserver IMPLEMENTATION DETAILS
gesftpserver supports up to version 6 of the SFTP protocol and the following extensions: newline Reports the server's newline convention to the client. space-available Equivalent to df(1). supported v5 capability details supported2 v6 capability details text-seek Used for resuming text file downloads. vendor-id Reports server name and version to client. gesftpserver reports a vendor of "Green End" and a server name of "Green End SFTP Server". versions Lists available versions. version-select Select version. posix-rename@openssh.org Provides POSIX rename semantics even in pre-v5 SFTP. SEE ALSO
sshd_config(5) gesftpserver(8)