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POPerl / Net::SNMP : script too slow, need to optimize
 

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  1. POPerl / Net::SNMP : script too slow, need to optimize
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    <p><br> I would like to optimize my perl script because it is a bit slow for displaying informations about the network.<br> I don't know what can be changed or ameliorated to boost the script execution.<br> I manipulate several hashes, to get : mac add, index, etc... I think it's a bit heavy, but no other choice.<br> Moreover, I do a lot of SNMP request and the handling of errors is maybe not great.<br> I copy/paste my script and its module.<br> Thanks in advance for reading my code. </p> <p>It takes in args : </p> <ol> <li>interface name (ex. FastEthernet0/9 or FastEthernet0/1...)</li> <li>hostname : ip of the switch</li> <li>community (often =public) </li> </ol> <p>Hope this is comprehensible. </p> <pre><code> #!/usr/bin/perl use strict; use warnings; use Getopt::Long; use SnmpUtil; use AdresseMac; use Net::SNMP; use Net::SNMP::Interfaces; my $ifname; my $hostname; my $community; my $version = 1; GetOptions( "ifname=s" =&gt; \$ifname, "host=s" =&gt; \$hostname, "community=s" =&gt; \$community, "protocol:s" =&gt; \$version); my $interfaces = Net::SNMP::Interfaces-&gt;new(Hostname =&gt; $hostname, Community =&gt; $community); my $inter = $interfaces-&gt;interface($ifname); #Get interface $ifname my $ifindex = $inter-&gt;index(); #Vitesse my $vitesse = $inter-&gt;ifHighSpeed(); #Alias my $ifalias = $inter-&gt;ifAlias(); #Seek for VLANs my $vlan_trouve; #Listing all VLANS my $vmVlan = "1.3.6.1.4.1.9.9.68.1.2.2.1.2"; #OID of vlan table my $vlans = SnmpUtil-&gt;new($hostname, $community); my %vl = $vlans-&gt;requeteTable($vmVlan); $vlans-&gt;deconnexion(); #Get the good VLAN corresponding to index interface $vlan_trouve = $vl{$ifindex}; #Listing : port VLAN &lt;-&gt; @mac my $dot1dTpFdbAddress = "1.3.6.1.2.1.17.4.3.1.1"; my $dot = SnmpUtil-&gt;new($hostname, $community."@".$vlan_trouve); my %dot1address = $dot-&gt;requeteTable($dot1dTpFdbAddress); #Listing : numPortBridge &lt;-&gt; port VLAN my $dot1dTpFdbPort = "1.3.6.1.2.1.17.4.3.1.2"; my %portdot = reverse($dot-&gt;requeteTable($dot1dTpFdbPort)); #Listing : num Port bridge &lt;-&gt; ID port switch my $dot1dBasePortIfIndex = "1.3.6.1.2.1.17.1.4.1.2"; my %dotindex = reverse($dot-&gt;requeteTable($dot1dBasePortIfIndex)); #Duplex (auto, half or full) my $oid_cisco_duplex = "1.3.6.1.2.1.10.7.2.1.19.".$ifindex; my $duplex = $dot-&gt;requete($oid_cisco_duplex); if ($duplex==1) { $duplex= "Auto"; } elsif ($duplex==2) { $duplex = "Half"; } elsif ($duplex==3) { $duplex= "Full"; } #Close connection $dot-&gt;deconnexion(); #Go back up, to find mac add my $numportbridge = $dotindex{$ifindex}; if (!defined($numportbridge)) { print "Erreur : $ifindex not found in list : num Port bridge &lt;-&gt; ID port switch\n"; exit 2; } my $portVlan = $portdot{$numportbridge}; if (!defined($portVlan)) { print "Erreur : $numportbridge not found in list : numPortBridge &lt;-&gt; ports du VLAN\n"; exit 3; } my $add = uc($dot1address{$portVlan}); if (!defined($add)) { print "Erreur : $portVlan not found in list : ports du VLAN &lt;-&gt; \@mac\n"; exit 4; } $add =~ s/^0X//g; printf "&lt;b&gt;Port : $ifname&lt;/b&gt;&lt;br/&gt;Index $ifindex on VLAN : $vlan_trouve&lt;br/&gt;\@mac : $add&lt;br/&gt;Speed=$vitesse Mbps Alias=$ifalias&lt;br/&gt;Duplex: $duplex\n"; </code></pre> <p>Here's SnmpUtil.pm :</p> <pre><code>#!/usr/bin/perl use strict; use warnings; use Net::SNMP; package SnmpUtil; our ($session, $error); sub new { my ($classe, $hostname, $community) = @_; my $this = { "hostname" =&gt; $hostname, "community" =&gt; $community }; bless($this, $classe); $this-&gt;{connexion} = $this-&gt;connexion; return $this; } sub connexion { my ($this) = @_; ($session, $error) = Net::SNMP-&gt;session( -hostname =&gt; $this-&gt;{hostname}, -community =&gt; $this-&gt;{community}, -version =&gt; "1", -timeout =&gt; 3, ); request_error_connexion() if (!defined($session)); } sub request_error_connexion { my ($this) = @_; print "Erreur : can't connect to host\n"; print "Erreur : $error\n"; if ($error =~ /The argument "-community" is unknown/) { # protocol SNMP version 3 not working exit 3; # code ret final = 3*256 = 768 } else { exit 1; # code retour final = 1*256 = 256 } } sub request_error { my ($this) = @_; print "Error : no answer from host\n"; printf "Erreur : %s\n",$session-&gt;error; if ($session-&gt;error =~ /No response from remote host/) { #host ok, bad community or host refuse connection $session-&gt;close; exit 2; # code retour final = 2*256 = 512 } else { #can not find table $session-&gt;close; exit 4; # code retour final = 4*256 = 1024 } } sub requeteTable { my ($this, $oid) = @_; my $result = $session-&gt;get_table( -baseoid =&gt; $oid ); request_error() if (!defined($result)); my %tab = (); foreach my $i (Net::SNMP::oid_lex_sort(keys %{$result})) { my $index = $i; $index =~ s/$oid.//; $tab{ $index } = $result-&gt;{$i}; #print $index."--".$result-&gt;{$i}."\n"; } return %tab; } sub requete { my ($this, $oid) = @_; my $result = $session-&gt;get_request($oid); request_error() if (!defined($result)); return $result-&gt;{$oid}; } sub deconnexion { my ($this) = @_; $session-&gt;close(); } 1; </code></pre> <p>AdresseMac.pm module is useless, it's just to convert dec to hex &amp; vice-versa.</p> <p>Thanks for your help,<br> big reward for the one who find optimization ;)</p> <p>PS: forgot to say, I work on cisco switch 2960.</p>
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