in reply to Re: Re: SFTP hangs (winxp)
in thread SFTP hangs (winxp)

Ask the sysadmin of the remote machine if they would be willing to set up a second sshd on another port with logging cranked up so that you can test. It's worth a shot. Otherwise, you need to step through to find the part that is breaking your code.

Begin at the beginning. First, confirm that you can get Net::SSH::Perl working:

    my $ssh = Net::SSH::Perl->new("host1", protocol=>2, debug=>1);
    $ssh->login("user1", "pass1");

    ($out, $err, $exit) = $ssh->cmd("hostname");
    print "Out: $out$/Err: $err$/Exit: $exit$/";

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If that doesn't return the hostname (modulo any syntax errors ... I didn't test the code), then there is something wrong with the server.

From there, step through the Net::SFTP code until you find the bit that breaks it. (extract follows)

sub do_init {
    my $sftp = shift;
    my $ssh = $sftp->{ssh};

    $sftp->debug("Sending SSH2_FXP_INIT");
    my $msg = $sftp->new_msg(SSH2_FXP_INIT);
    $msg->put_int32(SSH2_FILEXFER_VERSION);
    $sftp->send_msg($msg);

    $msg = $sftp->get_msg;
    my $type = $msg->get_int8;
    if ($type != SSH2_FXP_VERSION) {
        croak "Invalid packet back from SSH2_FXP_INIT (type $type)";
    }
    my $version = $msg->get_int32;
    $sftp->debug("Remote version: $version");

    ## XXX Check for extensions.
}
.
.
.
sub send_msg {
    my $sftp = shift;
    my($buf) = @_;
    my $b = Net::SFTP::Buffer->new;
    $b->put_int32($buf->length);
    $b->append($buf->bytes);
    $sftp->{channel}->send_data($b->bytes);
}

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Good luck bughunting ...

My parents just came back from a planet where the dominant life form had no
bilateral symmetry, and all I got was this stupid F-Shirt.

Replies are listed 'Best First'.
Re: Re: Re: Re: SFTP hangs (winxp)
by rkg (Hermit) on Dec 07, 2003 at 14:12 UTC
    Hi idsfa,

    Just getting around to trying your suggestion after a long delay. Thanks for the advice.

    After installing Net::SSH::W32Perl, I tried your test script. It logs in happily, then hangs at the "hostname" command, sort of like my original post. Any ideas, or do you think the problem is on the server side?

    rkg 

    C:\perl\test_snippets>perl net-ssh.pl
denmark: Reading configuration data /.ssh/config
denmark: Reading configuration data /etc/ssh_config
denmark: Connecting to XXXXXXXXXX, port 22.
denmark: Socket created, turning on blocking...
denmark: Remote protocol version 1.99, remote software version OpenSSH
+_3.4p1
denmark: Net::SSH::Perl Version 1.23, protocol version 2.0.
denmark: No compat match: OpenSSH_3.4p1.
denmark: Connection established.
denmark: Sent key-exchange init (KEXINIT), wait response.
denmark: Algorithms, c->s: 3des-cbc hmac-sha1 none
denmark: Algorithms, s->c: 3des-cbc hmac-sha1 none
denmark: Entering Diffie-Hellman Group 1 key exchange.
denmark: Sent DH public key, waiting for reply.
denmark: Received host key, type 'ssh-dss'.
denmark: Host XXXXXXX is known and matches the host key.
denmark: Computing shared secret key.
denmark: Verifying server signature.
denmark: Waiting for NEWKEYS message.
denmark: Enabling incoming encryption/MAC/compression.
denmark: Send NEWKEYS, enable outgoing encryption/MAC/compression.
denmark: Sending request for user-authentication service.
denmark: Service accepted: ssh-userauth.
denmark: Trying empty user-authentication request.
denmark: Authentication methods that can continue: publickey,password,
+keyboard-interactive.
denmark: Next method to try is publickey.
denmark: Next method to try is password.
denmark: Trying password authentication.
denmark: Login completed, opening dummy shell channel.
denmark: channel 0: new [client-session]
denmark: Requesting channel_open for channel 0.
denmark: channel 0: open confirm rwindow 0 rmax 32768
denmark: Got channel open confirmation, requesting shell.
denmark: Requesting service shell on channel 0.
denmark: channel 1: new [client-session]
denmark: Requesting channel_open for channel 1.
denmark: Entering interactive session.
denmark: Sending command: hostname
denmark: Requesting service exec on channel 1.
denmark: channel 1: open confirm rwindow 0 rmax 32768

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    ...and it hangs here.

    Here's the code 

    use Net::SSH::W32Perl;

my $ssh = Net::SSH::W32Perl->new("XXXXXX", protocol=>2, debug=>1);
    $ssh->login("XXXXX", "XXXXXX");

    ($out, $err, $exit) = $ssh->cmd("hostname");
    print "Out: $out$/Err: $err$/Exit: $exit$/";

    [download]
[reply]
[d/l]
[select]
      Just found Net::SSH::W32Perl today, and found the same problem.   Note the thread at NET::SSH::W32PERL - script Hangs when trying to run a command where same complaint is raised - hanging at the same point.   Has anyone gotten Net:SSH::* to work on Win32 in recent times? 
      TLSXPA: Login completed, opening dummy shell channel.
TLSXPA: channel 0: new client-session
TLSXPA: Requesting channel_open for channel 0.
TLSXPA: channel 0: open confirm rwindow 0 rmax 32768
TLSXPA: Got channel open confirmation, requesting shell.
TLSXPA: Requesting service shell on channel 0.
TLSXPA: channel 1: new client-session
TLSXPA: Requesting channel_open for channel 1.
TLSXPA: Entering interactive session.
TLSXPA: Sending command: date
TLSXPA: Requesting service exec on channel 1.
TLSXPA: channel 1: open confirm rwindow 0 rmax 32768
      Hey, just found rebuilt for AS 5.8.x. I'll see what happens if I _can_ uninstall Net::SSH::* and reinstall from his site. (sigh)
[reply]
      Hoorah!   Hoorah! 
      TLSXPA: Entering interactive session.
TLSXPA: Sending command: date
TLSXPA: Requesting service exec on channel 1.
TLSXPA: channel 1: open confirm rwindow 0 rmax 32768
TLSXPA: input_channel_request: rtype exit-status reply 0
TLSXPA: channel 1: rcvd eof
TLSXPA: channel 1: output open -> drain
TLSXPA: channel 1: rcvd close
TLSXPA: channel 1: input open -> closed
TLSXPA: channel 1: close_read
TLSXPA: channel 1: obuf empty
TLSXPA: channel 1: output drain -> closed
TLSXPA: channel 1: close_write
TLSXPA: channel 1: send close
TLSXPA: channel 1: full closed
 exit   '0'
 stdout 'Tue Dec  9 23:28:44 CST 2003'
      I added Scott Scecina's repository as advised 
        rep add soulcage http://www.soulcage.net/ppds.58/

      [download]
      then moved the repository higher in the list that PPM3 was looking at, then uninstalled both Net-SSH-W32Perl and Net-SSH-Perl, then re-installed Net-SSH-W32Perl from his repository, and huzzah!

      And after reading his ERRATA.txt comments, where he said he'd modified Net::SFTP to understand to use Net::SSH::W32Perl, I uninstalled Net-SFTP and re-installed it.   I retried the Net::SFTP test program.   After figuring out that I needed to change the ls() call to   my @files = $sftp->ls('.');   I was able to get it working too!

      Now... what did I want it for ... ?   So long ago ... can't ... remember...

[reply]
[d/l]
        Great node, thanks. Yes, the order of install / uninstall matters. Many many thanks.
[reply]

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