Net::OpenSSH problem "controlpath is too long"

Sombrerero_loco has asked for the wisdom of the Perl Monks concerning the following question:

Hi Guys. Again with problem with Net::OpenSSH and a script. Finally i managed to install Net:OpenSSH 0.74 on a HP-UX B11.31 This server is running this version of ssh

bash-4.3$ ssh -V
OpenSSH_5.8p1+sftpfilecontrol-v1.3-hpn13v7, OpenSSL 0.9.8r 8 Feb 2011
HP-UX Secure Shell-A.05.80.004, HP-UX Secure Shell version
[download]

When i try to run the connect constructor, it returns me this error and stops (because of the Die and my script)

ControlPath too long
SSH connetion failed: unable to establish master SSH connection: bad p
+assword or master process exited unexpectedly at
[download]

Part of the script that fails

for my $vh(sort @hosts)  {
  for my $vl(@logins)     {
    for my $vp(@pwd)        {
      print "Escaneando host $vh con usuarios $vl password $vp\n";

      #PREPARAMOS CONEXION SSH
      my $ssh = Net::OpenSSH->new($vh, user => $vl, password => $vp) o
+r warn "Host $vh caido\n";
      $ssh->error and die "SSH connetion failed: " . $ssh->error;
      #print "$ssh->error";
....
[download]

Any ideas?ż?ż

Comment on Net::OpenSSH problem "controlpath is too long" Select or Download Code

Replies are listed 'Best First'.
Re: Net::OpenSSH problem "controlpath is too long" by salva (Canon) on Mar 03, 2017 at 09:09 UTC
Net::OpenSSH communicates with the OpenSSH master process through a socket that by default has a name similar to `/home/user/.libnet-openssh-perl/my.host.name.com-4589-445`. The maximum length for the path is given by the size of the `sun_path` slot on the `sockaddr_un` structure, which seems to be 92 bytes for HP-UX. So, your home has a very long path or you are accessing hosts with extremely long file names or both. As a workaround, you can set a shorter path passing it into the constructor with the option `ctl_path`. In any case, the module shouldn't fail just because the hostname is too long. This is a bug I will fix in the next release. Update: version 0.75_01 is now available!	[reply] [d/l] [select]
Re: Net::OpenSSH problem "controlpath is too long" by thanos1983 (Parson) on Mar 03, 2017 at 09:11 UTC
Hello again Sombrerero_loco I noticed on the sample of your script that you are SSH to multiple nodes: `for my $vh(sort @hosts) {` [download] This kind of processes will force sequential SSH sessions. ~~I can not really test your code since you have provide us only a sample, so I can not replicate your problem.~~ Update: of course the author knows how to resolve the problem. Just take a look also on similar examples in case you find something useful. But, in the past I had similar problems I tested any possible way of ssh, telnet modules that I could find. Take a look with working codes examples Best module to execute administrator commands on external operating systems (Linux). Recently also another monk was asking for something similar (been able to SSH to multiple nodes). I created a working example for him with Net::OpenSSH::Parallel and the example is multiple machines disk space alert. Similarly if you want to execute also SUDO commands, including example with working code Net::OpenSSH::Parallel with sudo commands. Hope this helps, maybe to have another approach to your problem. Seeking for Perl wisdom...on the process of learning...not there...yet!	[reply] [d/l] [select]


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