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New version of the IOSXR module using Expect

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* The previous module only worked for 32-bit IOSXR, and already
  there some fiddling with the STDIN of the process was required
  when being run from netdisco-backend
* In 64-bit IOSXR, the STDIN workaround stopped working and
  created a stuck ssh process on every arpnip
* This new version uses Expect instead of plain SSH, so a proper
  pty is provided under any circumstances
* Successfully tested on recent 32- and 64-bit variants
This commit is contained in:
Christian Ramseyer
2020-01-27 21:03:23 +01:00
parent f2f5d908bb
commit 0938cd1651
1 changed files with 30 additions and 11 deletions
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41
lib/App/Netdisco/SSHCollector/Platform/IOSXR.pm
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@@ -6,7 +6,10 @@ App::Netdisco::SSHCollector::Platform::IOSXR
=head1 DESCRIPTION =head1 DESCRIPTION
Collect ARP entries from Cisco IOSXR devices. Collect ARP entries from IOSXR routers using Expect
This is a reworked version of the IOSXR module, and it is suitable
for both 32- and 64-bit IOSXR.
=cut =cut
@@ -14,6 +17,7 @@ use strict;
use warnings; use warnings;
use Dancer ':script'; use Dancer ':script';
use Expect;
use Moo; use Moo;
=head1 PUBLIC METHODS =head1 PUBLIC METHODS
@@ -34,20 +38,31 @@ Returns a list of hashrefs in the format C<{ mac =E<gt> MACADDR, ip =E<gt> IPADD
sub arpnip { sub arpnip {
my ($self, $hostlabel, $ssh, $args) = @_; my ($self, $hostlabel, $ssh, $args) = @_;
# IOSXR show commands seem to depend on an available STDIN
unless (-t STDIN){
open STDIN, "<", "/dev/zero" or warn "Failed to fake stdin: $!";
}
debug "$hostlabel $$ arpnip()"; debug "$hostlabel $$ arpnip()";
my @data = $ssh->capture("show arp vrf all");
chomp @data; my ($pty, $pid) = $ssh->open2pty;
my @arpentries; unless ($pty) {
warn "unable to run remote command [$hostlabel] " . $ssh->error;
return ();
}
my $expect = Expect->init($pty);
my ($pos, $error, $match, $before, $after);
my $prompt = qr/# +$/;
my $timeout = 10;
($pos, $error, $match, $before, $after) = $expect->expect($timeout, -re, $prompt);
$expect->send("terminal length 0\n");
($pos, $error, $match, $before, $after) = $expect->expect($timeout, -re, $prompt);
$expect->send("show arp vrf all\n");
($pos, $error, $match, $before, $after) = $expect->expect($timeout, -re, $prompt);
my @arpentries = ();
my @data = split(m/\n/, $before);
# 0.0.0.0 00:00:00 0000.0000.0000 Dynamic ARPA GigabitEthernet0/0/0/0
foreach (@data) { foreach (@data) {
my ($ip, $age, $mac, $state, $t, $iface) = split(/\s+/); my ($ip, $age, $mac, $state, $t, $iface) = split(/\s+/);
if ($ip =~ m/(\d{1,3}\.){3}\d{1,3}/ if ($ip =~ m/(\d{1,3}\.){3}\d{1,3}/
@@ -56,6 +71,10 @@ sub arpnip {
} }
} }
$expect->send("exit\n");
$expect->soft_close();
return @arpentries; return @arpentries;
} }