Initial version for Info::Ipv6 class. Not to be used directly, intended
use is to be inherited by Info::Layer3. This class provides mapping of IPv6 network addresses to Ethernet media addresses (MACs) and interface indexes. It will try various MIBs; with debug on, when data is returned, a message will be logged to inform which MIB contained the relevant data.
This commit is contained in:
Jeroen van Ingen
341
Info/Ipv6.pm
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341
Info/Ipv6.pm
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# SNMP::Info::Ipv6
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#
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# Copyright (c) 2010 Jeroen van Ingen
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the University of California, Santa Cruz nor the
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# names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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package SNMP::Info::Ipv6;
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use strict;
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use Exporter;
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use SNMP::Info;
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@SNMP::Info::Ipv6::ISA = qw/SNMP::Info Exporter/;
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@SNMP::Info::Ipv6::EXPORT_OK = qw//;
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use vars qw/$VERSION %MIBS %FUNCS %GLOBALS %MUNGE $METHOD/;
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use constant {
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IPMIB => 1,
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CISCO => 2,
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IPV6MIB => 3,
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};
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$VERSION = '2.01';
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%MIBS = (
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'IP-MIB' => 'ipv6InterfaceTableLastChange',
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'IPV6-MIB' => 'ipv6IfTableLastChange',
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'CISCO-IETF-IP-MIB' => 'cInetNetToMediaNetAddress',
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);
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%GLOBALS = ();
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%FUNCS = (
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'ip_n2p_phys_addr' => 'ipNetToPhysicalPhysAddress', # IP-MIB
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'c_inet_phys_addr' => 'cInetNetToMediaPhysAddress', # CISCO-IETF-IP-MIB
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'i6_n2p_phys_addr' => 'ipv6NetToMediaNetAddress', # IPV6-MIB
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'ip_n2p_phys_type' => 'ipNetToPhysicalType', # IP-MIB
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'c_inet_phys_type' => 'cInetNetToMediaType', # CISCO-IETF-IP-MIB
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'i6_n2p_phys_type' => 'ipv6NetToMediaType', # IPV6-MIB
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'ip_n2p_phys_state' => 'ipNetToPhysicalState', # IP-MIB
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'c_inet_phys_state' => 'cInetNetToMediaState', # CISCO-IETF-IP-MIB
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'i6_n2p_phys_state' => 'ipv6NetToMediaState', # IPV6-MIB
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);
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%MUNGE = (
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'ip_n2p_phys_addr' => \&SNMP::Info::munge_mac,
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'c_inet_phys_addr' => \&munge_physaddr,
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'i6_n2p_phys_addr' => \&SNMP::Info::munge_mac,
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);
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sub ipv6_n2p_mac {
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my $info = shift;
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my $return;
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my $phys_addr = &test_methods( $info, {
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ip_n2p_phys_addr => IPMIB,
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c_inet_phys_addr => CISCO,
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i6_n2p_phys_addr => IPV6MIB,
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});
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return unless defined $phys_addr;
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foreach my $row (keys %$phys_addr) {
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if ($row =~ /^(\d+)\.(\d+)\.(\d+)\.([\d\.]+)$/) {
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my $ifindex = $1; my $addrtype = $2; my $addrsize = $3; my $v6addr = $4;
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if ($info::METHOD == IPV6MIB) {
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# IPV6-MIB doesn't include the addrtype in the index;
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# also, address syntax is Ipv6Address (fixed 16 bytes) and not InetAddress (length field followed by address bytes)
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$v6addr = join('.', $addrtype, $addrsize, $v6addr);
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$addrtype = 2;
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}
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if ($addrtype == 2) { # IPv6
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$return->{$row} = substr($phys_addr->{$row}, 0, 17);
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}
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}
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}
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printf("%s: data comes from %s.\n", &my_sub_name, $info->method_used() ) if $info->debug();
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return $return;
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}
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sub ipv6_n2p_addr {
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my $info = shift;
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my $return;
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my $net_addr = &test_methods( $info, {
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ip_n2p_phys_addr => IPMIB,
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c_inet_phys_addr => CISCO,
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i6_n2p_phys_addr => IPV6MIB,
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});
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return unless defined $net_addr;
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foreach my $row (keys %$net_addr) {
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if ($row =~ /^(\d+)\.(\d+)\.(\d+)\.([\d\.]+)$/) {
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my $ifindex = $1; my $addrtype = $2; my $addrsize = $3; my $v6addr = $4;
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if ($info::METHOD == IPV6MIB) {
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# IPV6-MIB doesn't include the addrtype in the index;
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# also, address syntax is Ipv6Address (fixed 16 bytes) and not InetAddress (length field followed by address bytes)
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$v6addr = join('.', $addrtype, $addrsize, $v6addr);
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$addrtype = 2;
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}
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if ($addrtype == 2) { # IPv6
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my $v6_packed = pack("C*", split(/\./, $v6addr));
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$v6addr = join(':', map { sprintf("%04x", $_) } unpack("n*", $v6_packed) );
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$return->{$row} = $v6addr;
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}
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}
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}
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printf("%s: data comes from %s.\n", &my_sub_name, $info->method_used() ) if $info->debug();
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return $return;
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}
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sub ipv6_n2p_if {
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my $info = shift;
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my $return;
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my $phys_addr = &test_methods( $info, {
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ip_n2p_phys_addr => IPMIB,
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c_inet_phys_addr => CISCO,
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i6_n2p_phys_addr => IPV6MIB,
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});
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return unless defined $phys_addr;
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foreach my $row (keys %$phys_addr) {
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if ($row =~ /^(\d+)\.(\d+)\.(\d+)\.([\d\.]+)$/) {
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my $ifindex = $1; my $addrtype = $2; my $addrsize = $3; my $v6addr = $4;
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if ($info::METHOD == IPV6MIB) {
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# IPV6-MIB doesn't include the addrtype in the index;
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# also, address syntax is Ipv6Address (fixed 16 bytes) and not InetAddress (length field followed by address bytes)
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$v6addr = join('.', $addrtype, $addrsize, $v6addr);
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$addrtype = 2;
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}
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if ($addrtype == 2) { # IPv6
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$return->{$row} = $ifindex;
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}
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}
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}
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printf("%s: data comes from %s.\n", &my_sub_name, $info->method_used() ) if $info->debug();
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return $return;
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}
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sub ipv6_n2p_type {
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my $info = shift;
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my $return;
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my $phys_type = &test_methods( $info, {
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ip_n2p_phys_type => IPMIB,
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c_inet_phys_type => CISCO,
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i6_n2p_phys_type => IPV6MIB,
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});
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return unless defined $phys_type;
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foreach my $row (keys %$phys_type) {
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if ($row =~ /^(\d+)\.(\d+)\.(\d+)\.([\d\.]+)$/) {
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my $ifindex = $1; my $addrtype = $2; my $addrsize = $3; my $v6addr = $4;
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if ($info::METHOD == IPV6MIB) {
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# IPV6-MIB doesn't include the addrtype in the index;
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# also, address syntax is Ipv6Address (fixed 16 bytes) and not InetAddress (length field followed by address bytes)
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$v6addr = join('.', $addrtype, $addrsize, $v6addr);
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$addrtype = 2;
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}
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if ($addrtype == 2) { # IPv6
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$return->{$row} = $phys_type->{$row};
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}
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}
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}
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printf("%s: data comes from %s.\n", &my_sub_name, $info->method_used() ) if $info->debug();
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return $return;
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}
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sub ipv6_n2p_state {
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my $info = shift;
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my $return;
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my $phys_state = &test_methods( $info, {
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ip_n2p_phys_state => IPMIB,
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c_inet_phys_state => CISCO,
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i6_n2p_phys_state => IPV6MIB,
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});
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return unless defined $phys_state;
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foreach my $row (keys %$phys_state) {
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if ($row =~ /^(\d+)\.(\d+)\.(\d+)\.([\d\.]+)$/) {
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my $ifindex = $1; my $addrtype = $2; my $addrsize = $3; my $v6addr = $4;
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if ($info::METHOD == IPV6MIB) {
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# IPV6-MIB doesn't include the addrtype in the index;
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# also, address syntax is Ipv6Address (fixed 16 bytes) and not InetAddress (length field followed by address bytes)
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$v6addr = join('.', $addrtype, $addrsize, $v6addr);
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$addrtype = 2;
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}
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if ($addrtype == 2) { # IPv6
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$return->{$row} = $phys_state->{$row};
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}
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}
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}
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printf("%s: data comes from %s.\n", &my_sub_name, $info->method_used() ) if $info->debug();
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return $return;
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}
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sub method_used {
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my $info = shift;
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my $return;
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if ($info::METHOD eq IPMIB) {
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$return = 'IP-MIB';
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} elsif ($info::METHOD eq IPV6MIB) {
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$return = 'IPV6-MIB';
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} elsif ($info::METHOD eq CISCO) {
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$return = 'CISCO-IETF-IP-MIB';
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} else {
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$return = 'none of the MIBs';
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}
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return $return;
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}
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sub test_methods {
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my $info = shift;
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my $test = shift;
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my $return = {};
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foreach my $method (sort {$test->{$a} <=> $test->{$b}} keys %$test) {
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$return = $info->$method || {};
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if (scalar keys %$return) {
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$info::METHOD = $test->{$method};
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last;
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}
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}
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return $return;
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}
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sub my_sub_name {
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my @callinfo = caller(1);
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return $callinfo[3];
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}
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=item munge_physaddr()
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Takes an octet stream (HEX-STRING) and returns a colon separated ASCII hex
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string.
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=cut
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sub munge_physaddr {
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my $addr = shift;
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return unless defined $addr;
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return unless length $addr;
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$addr = join( ':', map { sprintf "%02x", $_ } unpack( 'C*', $addr ) );
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return $addr;
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}
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1;
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__END__
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=head1 NAME
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SNMP::Info::Ipv6 - SNMP Interface for mapping IPv6 addresses to MACs and interfaces, using information from
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F<IP-MIB>, F<IPV6-MIB> and/or F<CISCO-IETF-IP-MIB>.
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=head1 AUTHOR
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Jeroen van Ingen
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=head1 SYNOPSIS
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# Let SNMP::Info determine the correct subclass for you.
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my $info = new SNMP::Info(
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AutoSpecify => 1,
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Debug => 1,
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DestHost => 'myswitch',
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Community => 'public',
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Version => 2
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)
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or die "Can't connect to DestHost.\n";
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my $class = $info->class();
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print "SNMP::Info determined this device to fall under subclass : $class\n";
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=head1 DESCRIPTION
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The SNMP::Info::Ipv6 class implements functions to for mapping IPv6 addresses
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to MAC addresses, interfaces and more. It will use data from the IP-MIB, IPV6-MIB
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or the CISCO-IETF-IP-MIB, whichever is supported by the device.
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This class is inherited by Info::Layer3 to provide IPv6 node tracking across
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device classes.
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For debugging purposes you can call this class directly as you would
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SNMP::Info
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my $info = new SNMP::Info::Ipv6 (...);
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=head2 Inherited Classes
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none.
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=head2 Required MIBs
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=over
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=item F<IP-MIB>
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=item F<IPV6-MIB>
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=item F<CISCO-IETF-IP-MIB>
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=back
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=head1 GLOBALS
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none.
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=head1 TABLE METHODS
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These are methods that return tables of information in the form of a reference
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to a hash.
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=head2 Internet Address Translation table
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=over
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=item $info->c_inet_phys_address()
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Maps an address of type C<cInetNetToMediaNetAddressType> on interface C<ifIndex> to a physical address.
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=back
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=cut
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Reference in New Issue
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