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1.1 |
=head1 NAME |
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AnyEvent::Porttracker - Porttracker/PortIQ API client interface. |
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=head1 SYNOPSIS |
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use AnyEvent::Porttracker; |
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1.9 |
my $api = new AnyEvent::Porttracker |
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host => "10.0.0.1", |
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user => "admin", |
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pass => "31331", |
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tls => 1, |
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; |
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# Example 1 |
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1.15 |
# a simple request: ping the server synchronously |
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1.9 |
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1.15 |
my ($timestamp, $pid) = $api->req_sync ("ping"); |
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1.9 |
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# Example 2 |
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# find all realms, start a discovery on all of them |
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# and wait until all discovery processes have finished |
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1.15 |
# but execute individual discoveries in parallel, |
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# asynchronously |
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1.9 |
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my $cv = AE::cv; |
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$cv->begin; |
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# find all realms |
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$api->req (realm_info => ["gid", "name"], sub { |
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my ($api, @realms) = @_; |
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# start discovery on all realms |
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for my $realm (@realms) { |
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my ($gid, $name) = @$realm; |
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$cv->begin; |
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1.14 |
$api->req (realm_discover => $gid, sub { |
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warn "discovery for realm '$name' finished\n"; |
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1.9 |
$cv->end; |
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}); |
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} |
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$cv->end; |
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}); |
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$cv->recv; |
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# Example 3 |
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# subscribe to realm_poll_stop events and report each occurance |
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$api->req (subscribe => "realm_poll_stop", sub {}); |
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$api->on (realm_poll_stop_event => sub { |
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my ($api, $gid) = @_; |
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warn "this just in: poll for realm <$gid> finished.\n"; |
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}); |
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1.15 |
AE::cv->recv; # wait forever |
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1.1 |
=head1 DESCRIPTION |
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Porttracker (L<http://www.porttracker.com/>) is a product that (among |
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other things) scans switches and routers in a network and gives a coherent |
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view of which end devices are connected to which switch ports on which |
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switches and routers. It also offers a JSON-based client API, for which |
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this module is an implementation. |
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In addition to Porttracker, the PortIQ product is also supported, as it |
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uses the same protocol. |
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If you do not have access to either a Porttracker or PortIQ box then this |
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module will be of little value to you. |
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This module is an L<AnyEvent> user, you need to make sure that you use and |
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run a supported event loop. |
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1.3 |
To quickly understand how this module works you should read how to |
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construct a new connection object and then read about the event/callback |
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system. |
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1.5 |
The actual low-level protocol and, more importantly, the existing |
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requests and responses, are documented in the official Porttracker |
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API documentation (a copy of which is included in this module as |
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L<AnyEvent::Porttracker::protocol>. |
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1.1 |
=head1 THE AnyEvent::Porttracker CLASS |
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1.3 |
The AnyEvent::Porttracker class represents a single connection. |
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1.1 |
=over 4 |
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=cut |
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package AnyEvent::Porttracker; |
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use common::sense; |
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1.15 |
use Carp (); |
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1.1 |
use Scalar::Util (); |
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use AnyEvent (); |
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use AnyEvent::Handle (); |
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use MIME::Base64 (); |
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use Digest::HMAC_MD6 (); |
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use JSON (); |
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1.16 |
our $VERSION = '1.01'; |
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1.1 |
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sub call { |
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my ($self, $type, @args) = @_; |
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$self->{$type} |
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? $self->{$type}($self, @args) |
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1.2 |
: ($type = (UNIVERSAL::can $self, $type)) |
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1.1 |
? $type->($self, @args) |
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: () |
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} |
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1.4 |
=item $api = new AnyEvent::Porttracker [key => value...] |
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1.3 |
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Creates a new porttracker API connection object and tries to connect to |
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the specified host (see below). After the connection has been established, |
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the TLS handshake (if requested) will take place, followed by a login |
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attempt using either the C<none>, C<login_cram_md6> or C<login> methods, |
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in this order of preference (typically, C<login_cram_md6> is used, which |
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shields against some man-in-the-middle attacks and avoids transferring the |
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password). |
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It is permissible to send requests immediately after creating the object - |
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they will be queued until after successful login. |
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Possible key-value pairs are: |
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=over 4 |
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=item host => $hostname [MANDATORY] |
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The hostname or IP address of the Porttracker box. |
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=item port => $service |
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The service (port) to use (default: C<porttracker=55>). |
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=item user => $string, pass => $string |
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These are the username and password to use when authentication is required |
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(which it is in almost all cases, so these keys are normally mandatory). |
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1.6 |
=item tls => $bool |
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Enables or disables TLS (default: disables). When enabled, then the |
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connection will try to handshake a TLS connection before logging in. If |
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unsuccessful a fatal error will be raised. |
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Since most Porttracker/PortIQ boxes will not have a sensible/verifiable |
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certificate, no attempt at verifying it will be done (which means |
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man-in-the-middle-attacks will be trivial). If you want some form of |
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verification you need to provide your own C<tls_ctx> object with C<< |
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verify => 1, verify_peername => [1, 1, 1] >> or whatever verification mode |
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you wish to use. |
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=item tls_ctx => $tls_ctx |
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1.9 |
The L<AnyEvent::TLS> object to use. See C<tls>, above. |
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1.3 |
|
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=item on_XYZ => $coderef |
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1.11 |
You can specify event callbacks either by sub-classing and overriding the |
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respective methods or by specifying code-refs as key-value pairs when |
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1.9 |
constructing the object. You add or remove event handlers at any time with |
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the C<event> method. |
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1.3 |
|
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=back |
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1.1 |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = bless { |
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1.3 |
id => "a", |
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1.4 |
ids => [], |
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1.11 |
queue => [], # initially queue everything |
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1.1 |
@_, |
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}, $class; |
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{ |
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Scalar::Util::weaken (my $self = $self); |
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$self->{hdl} = new AnyEvent::Handle |
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connect => [$self->{host}, $self->{port} || "porttracker=55"], |
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on_error => sub { |
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1.6 |
$self->error ($_[2]); |
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1.1 |
}, |
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1.2 |
on_connect => sub { |
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if ($self->{tls}) { |
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$self->_req (start_tls => sub { |
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$_[1] |
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or return $self->error ("TLS rejected by server"); |
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1.3 |
$self->_login; |
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1.2 |
}); |
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} |
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}, |
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1.1 |
on_read => sub { |
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while ($_[0]{rbuf} =~ s/^([^\x0a]*)\x0a//) { |
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my $msg = JSON::decode_json $1; |
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my $id = shift @$msg; |
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if (defined $id) { |
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my $cb = delete $self->{cb}{$id} |
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or return $self->error ("received unexpected reply msg with id $id"); |
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1.4 |
push @{ $self->{ids} }, $id; |
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1.1 |
$cb->($self, @$msg); |
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} else { |
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$msg->[0] = "on_$msg->[0]_notify"; |
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call $self, @$msg; |
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} |
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} |
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}, |
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; |
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} |
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$self |
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} |
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sub DESTROY { |
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my ($self) = @_; |
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$self->{hdl}->destroy |
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if $self->{hdl}; |
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} |
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sub error { |
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my ($self, $msg) = @_; |
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1.6 |
call $self, on_error => $msg; |
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1.1 |
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() |
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} |
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1.2 |
sub _req { |
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1.1 |
my $self = shift; |
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my $cb = pop; |
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1.4 |
my $id = (pop @{ $self->{ids} }) || $self->{id}++; |
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1.1 |
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unshift @_, $id; |
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$self->{cb}{$id} = $cb; |
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my $msg = JSON::encode_json \@_; |
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$self->{hdl}->push_write ($msg); |
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} |
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1.6 |
=item $api->req ($type => @args, $callback->($api, @reply)) |
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1.4 |
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Sends a generic request of type C<$type> to the server. When the server |
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1.6 |
responds, the API object and the response arguments (without the success |
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status) are passed to the callback, which is the last argument to this |
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method. |
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If the request fails, then a fatal error will be raised. If you want to |
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handle failures gracefully, you need to use C<< ->req_failok >> instead. |
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1.4 |
|
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1.5 |
The available requests are documented in the Porttracker API |
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documentation (a copy of which is included in this module as |
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L<AnyEvent::Porttracker::protocol>. |
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1.4 |
It is permissible to call this (or any other request function) at any |
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time, even before the connection has been established - the API object |
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always waits until after login before it actually sends the requests, and |
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queues them until then. |
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Example: ping the porttracker server. |
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$api->req ("ping", sub { |
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my ($api, $ok, $timestamp, $pid) = @_; |
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... |
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}); |
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Example: determine the product ID. |
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$api->req (product_id => sub { |
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my ($api, $ok, $branding, $product_id) = @_; |
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... |
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}); |
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Example: set a new license. |
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$api->req (set_license => $LICENSE_STRING, sub { |
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my ($api, $ok) = @_; |
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$ok or die "failed to set license"; |
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}); |
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=cut |
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root |
1.2 |
sub req { |
304 |
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1.6 |
my $cb = pop; |
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push @_, sub { |
306 |
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1.7 |
splice @_, 1, 1 |
307 |
root |
1.6 |
or $_[0]->error ($_[1]); |
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&$cb |
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}; |
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$_[0]{queue} |
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? push @{ $_[0]{queue} }, [@_] |
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: &_req |
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} |
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1.15 |
=item @res = $api->req_sync ($type => @args) |
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Similar to C<< ->req >>, but waits for the results of the request and on |
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success, returns the values instead (without the success flag, and only |
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the first value in scalar context). On failure, the method will C<croak> |
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with the error message. |
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=cut |
325 |
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326 |
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sub req_sync { |
327 |
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push @_, my $cv = AE::cv; |
328 |
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&req; |
329 |
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my ($ok, @res) = $cv->recv; |
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331 |
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$ok |
332 |
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or Carp::croak $res[0]; |
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334 |
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wantarray ? @res : $res[0] |
335 |
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} |
336 |
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1.6 |
=item $api->req_failok ($type => @args, $callback->($api, $success, @reply)) |
338 |
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339 |
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Just like C<< ->req >>, with two differences: first, a failure will not |
340 |
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raise an error, second, the initial status reply which indicates success |
341 |
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or failure is not removed before calling the callback. |
342 |
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343 |
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=cut |
344 |
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345 |
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sub req_failok { |
346 |
root |
1.2 |
$_[0]{queue} |
347 |
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? push @{ $_[0]{queue} }, [@_] |
348 |
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: &_req |
349 |
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} |
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351 |
root |
1.9 |
=item $api->on (XYZ => $callback) |
352 |
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353 |
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Overwrites any currently registered handler for C<on_XYZ> or |
354 |
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installs a new one. Or, when C<$callback> is undef, unregisters any |
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currently-registered handler. |
356 |
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357 |
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Example: replace/set the handler for C<on_discover_stop_event>. |
358 |
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359 |
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$api->on (discover_stop_event => sub { |
360 |
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my ($api, $gid) = @_; |
361 |
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... |
362 |
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}); |
363 |
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364 |
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=cut |
365 |
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366 |
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sub on { |
367 |
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my $self = shift; |
368 |
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369 |
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while (@_) { |
370 |
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my ($event, $cb) = splice @_, 0, 2; |
371 |
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$event =~ s/^on_//; |
372 |
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373 |
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$self->{"on_$event"} = $cb; |
374 |
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} |
375 |
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} |
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|
377 |
root |
1.2 |
sub on_start_tls_notify { |
378 |
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my ($self) = @_; |
379 |
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|
380 |
root |
1.6 |
$self->{hdl}->starttls (connect => $self->{tls_ctx}); |
381 |
root |
1.3 |
$self->{tls} ||= 1; |
382 |
root |
1.2 |
|
383 |
root |
1.3 |
$self->_login; |
384 |
root |
1.2 |
} |
385 |
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|
386 |
root |
1.1 |
sub on_hello_notify { |
387 |
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my ($self, $version, $auths, $nonce) = @_; |
388 |
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389 |
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$version == 1 |
390 |
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or return $self->error ("protocol mismatch, got $version, expected/supported 1"); |
391 |
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392 |
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$nonce = MIME::Base64::decode_base64 $nonce; |
393 |
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394 |
root |
1.3 |
$self->{hello} = [$auths, $nonce]; |
395 |
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396 |
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$self->_login |
397 |
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unless $self->{tls}; # delay login when trying to handshake tls |
398 |
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} |
399 |
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|
400 |
|
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sub _login_success { |
401 |
|
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my ($self, $method) = @_; |
402 |
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|
403 |
|
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_req @$_ |
404 |
|
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for @{ delete $self->{queue} }; |
405 |
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|
406 |
|
|
call $self, on_login => $method; |
407 |
|
|
} |
408 |
|
|
|
409 |
|
|
sub _login { |
410 |
|
|
my ($self) = @_; |
411 |
|
|
|
412 |
|
|
my ($auths, $nonce) = @{ delete $self->{hello} or return }; |
413 |
|
|
|
414 |
root |
1.1 |
if (grep $_ eq "none", @$auths) { |
415 |
root |
1.3 |
$self->_login_success ("none"); |
416 |
root |
1.2 |
|
417 |
root |
1.1 |
} elsif (grep $_ eq "login_cram_md6", @$auths) { |
418 |
|
|
my $cc = join "", map chr 256 * rand, 0..63; |
419 |
|
|
|
420 |
root |
1.3 |
my $key = Digest::HMAC_MD6::hmac_md6 $self->{pass}, $self->{user}, 64, 256; |
421 |
root |
1.1 |
my $cr = Digest::HMAC_MD6::hmac_md6_base64 $key, "$cc$nonce", 64, 256; |
422 |
|
|
my $sr = Digest::HMAC_MD6::hmac_md6_base64 $key, "$nonce$cc", 64, 256; |
423 |
|
|
|
424 |
|
|
$cc = MIME::Base64::encode_base64 $cc; |
425 |
|
|
|
426 |
root |
1.3 |
$self->_req (login_cram_md6 => $self->{user}, $cr, $cc, sub { |
427 |
root |
1.1 |
my ($self, $ok, $msg) = @_; |
428 |
|
|
|
429 |
|
|
$ok |
430 |
|
|
or return call $self, on_login_failure => $msg; |
431 |
|
|
|
432 |
|
|
$msg eq $sr |
433 |
|
|
or return call $self, on_login_failure => "sr and cr mismatch, possible man in the middle attack"; |
434 |
|
|
|
435 |
root |
1.3 |
$self->_login_success ("login_cram_md6"); |
436 |
root |
1.1 |
}); |
437 |
|
|
} elsif (grep $_ eq "login", @$auths) { |
438 |
root |
1.3 |
$self->_req (login => $self->{user}, $self->{pass}, sub { |
439 |
root |
1.1 |
my ($self, $ok, $msg) = @_; |
440 |
|
|
|
441 |
|
|
$ok |
442 |
|
|
or return call $self, on_login_failure => $msg; |
443 |
|
|
|
444 |
root |
1.3 |
$self->_login_success ("login"); |
445 |
root |
1.1 |
}); |
446 |
|
|
} else { |
447 |
root |
1.2 |
call $self, on_login_failure => "no supported auth method (@$auths)"; |
448 |
root |
1.1 |
} |
449 |
root |
1.3 |
|
450 |
|
|
# we no longer need these, make it a bit harder to get them |
451 |
|
|
delete $self->{user}; |
452 |
|
|
delete $self->{pass}; |
453 |
root |
1.1 |
} |
454 |
|
|
|
455 |
root |
1.3 |
sub on_info_notify { |
456 |
root |
1.1 |
my ($self, $msg) = @_; |
457 |
|
|
|
458 |
root |
1.3 |
warn $msg; |
459 |
root |
1.1 |
} |
460 |
|
|
|
461 |
root |
1.2 |
sub on_error_notify { |
462 |
|
|
my ($self, $msg) = @_; |
463 |
|
|
|
464 |
|
|
$self->error ($msg); |
465 |
|
|
} |
466 |
|
|
|
467 |
root |
1.3 |
sub on_error { |
468 |
|
|
my ($self, $msg) = @_; |
469 |
|
|
|
470 |
|
|
warn $msg; |
471 |
|
|
|
472 |
|
|
%$self = (); |
473 |
|
|
} |
474 |
|
|
|
475 |
|
|
sub on_login_failure { |
476 |
|
|
my ($self, $msg) = @_; |
477 |
|
|
|
478 |
|
|
$msg =~ s/\n$//; |
479 |
|
|
$self->error ("login failed: $msg"); |
480 |
|
|
} |
481 |
|
|
|
482 |
root |
1.8 |
sub on_event_notify { |
483 |
|
|
my ($self, $event, @args) = @_; |
484 |
|
|
|
485 |
|
|
call $self, "on_${event}_event", @args; |
486 |
|
|
} |
487 |
|
|
|
488 |
root |
1.3 |
=back |
489 |
|
|
|
490 |
root |
1.12 |
=head1 EVENTS/CALLBACKS |
491 |
root |
1.3 |
|
492 |
root |
1.11 |
AnyEvent::Porttracker connections are fully event-driven, and naturally |
493 |
root |
1.3 |
there are a number of events that can occur. All these events have a name |
494 |
|
|
starting with C<on_> (example: C<on_login_failure>). |
495 |
|
|
|
496 |
|
|
Programs can catch these events in two ways: either by providing |
497 |
root |
1.11 |
constructor arguments with the event name as key and a code-ref as value: |
498 |
root |
1.3 |
|
499 |
|
|
my $api = new AnyEvent::Porttracker |
500 |
|
|
host => ..., |
501 |
|
|
user => ..., pass => ..., |
502 |
|
|
on_error => sub { |
503 |
|
|
my ($api, $msg) = @_; |
504 |
|
|
warn $msg; |
505 |
|
|
exit 1; |
506 |
|
|
}, |
507 |
|
|
; |
508 |
|
|
|
509 |
root |
1.11 |
Or by sub-classing C<AnyEvent::Porttracker> and overriding methods of the |
510 |
root |
1.3 |
same name: |
511 |
|
|
|
512 |
|
|
package MyClass; |
513 |
|
|
|
514 |
|
|
use base AnyEvent::Porttracker; |
515 |
|
|
|
516 |
|
|
sub on_error { |
517 |
|
|
my ($api, $msg) = @_; |
518 |
|
|
warn $msg; |
519 |
|
|
exit 1; |
520 |
|
|
} |
521 |
|
|
|
522 |
|
|
Event callbacks are not expected to return anything and are always passed |
523 |
|
|
the API object as first argument. Some might have default implementations |
524 |
|
|
(for example, C<on_error>), others are ignored unless overriden. |
525 |
|
|
|
526 |
|
|
Description of individual events follow: |
527 |
|
|
|
528 |
|
|
=over 4 |
529 |
|
|
|
530 |
|
|
=item on_error $api, $msg |
531 |
|
|
|
532 |
|
|
Is called for every (fatal) error, including C<error> notifies. The |
533 |
|
|
default prints the message and destroys the object, so it is highly |
534 |
|
|
advisable to override this event. |
535 |
|
|
|
536 |
|
|
=item on_login $api, $method |
537 |
|
|
|
538 |
|
|
Called after a successful login, after which commands can be send. It is |
539 |
|
|
permissible to send commands before a successful login: those will be |
540 |
|
|
queued and sent just before this event is invoked. C<$method> is the auth |
541 |
|
|
method that was used. |
542 |
|
|
|
543 |
|
|
=item on_login_failure $api, $msg |
544 |
|
|
|
545 |
|
|
Called when all login attempts have failed - the default raises a fatal |
546 |
|
|
error with the error message from the server. |
547 |
|
|
|
548 |
|
|
=item on_hello_notify $api, $version, $authtypes, $nonce |
549 |
|
|
|
550 |
|
|
This protocol notification is used internally by AnyEvent::Porttracker - |
551 |
|
|
you can override it, but the module will most likely not work. |
552 |
|
|
|
553 |
|
|
=item on_info_notify $api, $msg |
554 |
|
|
|
555 |
|
|
Called for informational messages from the server - the default |
556 |
|
|
implementation calls C<warn> but otherwise ignores this notification. |
557 |
|
|
|
558 |
|
|
=item on_error_notify $api, $msg |
559 |
|
|
|
560 |
|
|
Called for fatal errors from the server - the default implementation calls |
561 |
|
|
C<warn> and destroys the API object. |
562 |
|
|
|
563 |
|
|
=item on_start_tls_notify $api |
564 |
|
|
|
565 |
|
|
Called when the server wants to start TLS negotiation. This is used |
566 |
|
|
internally and - while it is possible to override it - should not be |
567 |
root |
1.11 |
overridden. |
568 |
root |
1.3 |
|
569 |
root |
1.8 |
=item on_event_notify $api, $eventname, @args |
570 |
|
|
|
571 |
|
|
Called when the server broadcasts an event the API object is subscribed |
572 |
|
|
to. The default implementation (which should not be overridden) simply |
573 |
root |
1.9 |
re-issues an "on_eventname_event" event with the @args. |
574 |
root |
1.8 |
|
575 |
root |
1.3 |
=item on_XYZ_notify $api, ... |
576 |
|
|
|
577 |
|
|
In general, any protocol notification will result in an event of the form |
578 |
|
|
C<on_NOTIFICATION_notify>. |
579 |
|
|
|
580 |
root |
1.8 |
=item on_XYZ_event $api, ... |
581 |
|
|
|
582 |
|
|
Called when the server broadcasts the named (XYZ) event. |
583 |
|
|
|
584 |
root |
1.1 |
=back |
585 |
|
|
|
586 |
|
|
=head1 SEE ALSO |
587 |
|
|
|
588 |
|
|
L<AnyEvent>, L<http://www.porttracker.com/>, L<http://www.infoblox.com/en/products/portiq.html>. |
589 |
|
|
|
590 |
|
|
=head1 AUTHOR |
591 |
|
|
|
592 |
root |
1.16 |
Marc Lehmann <marc@nethype.de> |
593 |
root |
1.1 |
|
594 |
|
|
=cut |
595 |
|
|
|
596 |
|
|
1 |