Re: Net::SFTP::Recursive problem with ssh_args => [use

I noticed a couple of errors. Looking at your debug output:

host.fqdn.tld: sftp: Sending SSH2_FXP_INIT
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That's telling you that Net::SFTP, which underlies Net::SFTP::Recursive, only supports SSH2 and not SSH1. So takeout the protocol => '2 1' because it isn't necessary.

Second, I'd change debug => 'true' to debug => 1 because it's easier to read. Then your script should start something like this:

#!/usr/bin/perl

use strict;
use warnings;
use Net::SFTP::Recursive;
use Data::Dumper;

my $host = '127.0.0.1';

my %cfg = (
    user     => 'user',
    password => 'password',
    debug    => 1,
);

my $sftp = Net::SFTP::Recursive->new($host, %cfg);
[download]

From what I can see, I think that your server expects SSH1, but it's not getting it:-).

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Re^2: Net::SFTP::Recursive problem with ssh_args => [use_pty => 0 ] by salva (Canon) on Mar 03, 2011 at 09:31 UTC
That's telling you that Net::SFTP, which underlies Net::SFTP::Recursive, only supports SSH2 and not SSH1 Not really! Net::SFTP implements version 3 of the protocol, that's the one supported by most servers regardless of its supported SSH protocol version. What happens is that the underlaying buggy Net::SSH::Perl is trying to open two channels inside the same SSH connection but the server only supports one channel per connection: `host.fqdn.tld: channel 0: new [client-session] host.fqdn.tld: Requesting channel_open for channel 0. host.fqdn.tld: channel 0: open confirm rwindow 32768 rmax 16384 host.fqdn.tld: channel 1: new [client-session] host.fqdn.tld: Requesting channel_open for channel 1. host.fqdn.tld: Channel open failure: 1: reason 4: Server supports one +session per SSH client` [download] Then, Net::SFTP does not check that the channel was successfully open, tries to send the INIT command anyway and fails. For comparison, opening a SFTP connection with OpenSSH: `$ ssh -v localhost -s sftp ... debug1: Authentication succeeded (publickey). debug1: channel 0: new [client-session] debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug1: Sending environment. debug1: Sending env LC_MESSAGES = en_AG.utf8 debug1: Sending env LANG = en_US.UTF-8 debug1: Sending subsystem: sftp` [download] It just opens a channel and uses it for SFTP.	[reply] [d/l] [select]

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Re^2: Net::SFTP::Recursive problem with ssh_args => [use_pty => 0 ]
by salva (Canon) on Mar 03, 2011 at 09:31 UTC

That's telling you that Net::SFTP, which underlies Net::SFTP::Recursive, only supports SSH2 and not SSH1

Not really!

Net::SFTP implements version 3 of the protocol, that's the one supported by most servers regardless of its supported SSH protocol version.

What happens is that the underlaying buggy Net::SSH::Perl is trying to open two channels inside the same SSH connection but the server only supports one channel per connection:

host.fqdn.tld: channel 0: new [client-session]
host.fqdn.tld: Requesting channel_open for channel 0.
host.fqdn.tld: channel 0: open confirm rwindow 32768 rmax 16384
host.fqdn.tld: channel 1: new [client-session]
host.fqdn.tld: Requesting channel_open for channel 1.
host.fqdn.tld: Channel open failure: 1: reason 4: Server supports one 
+session per SSH client
[download]

Then, Net::SFTP does not check that the channel was successfully open, tries to send the INIT command anyway and fails.

For comparison, opening a SFTP connection with OpenSSH:

$  ssh -v localhost -s sftp
...
debug1: Authentication succeeded (publickey).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: Sending environment.
debug1: Sending env LC_MESSAGES = en_AG.utf8
debug1: Sending env LANG = en_US.UTF-8
debug1: Sending subsystem: sftp
[download]

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