AnyEvent-FastPing/FastPing.pm

=head1 NAME

AnyEvent::FastPing - quickly ping a large number of hosts

=head1 SYNOPSIS

 use AnyEvent::FastPing;

=head1 DESCRIPTION

This module was written for a single purpose only: sending ICMP ECHO
REQUEST packets as quickly as possible to a large number of hosts
(thousands to millions).

It employs a sending thread and is fully event-driven (using AnyEvent), so
you have to run an event model supported by AnyEvent to use this module.

=head1 FUNCTIONS

=over 4

=cut

package AnyEvent::FastPing;

use strict;
no warnings;

use AnyEvent;

BEGIN {
   our $VERSION = '1.13';
   our @ISA = qw(Exporter);

   require Exporter;
   #Exporter::export_ok_tags (keys %EXPORT_TAGS);

   require XSLoader;
   XSLoader::load (__PACKAGE__, $VERSION);
}

our ($THR_REQ_FD, $THR_RES_FD, $ICMP4_FD, $ICMP6_FD);

our $THR_REQ_FH; open $THR_REQ_FH, ">&=$THR_REQ_FD" or die "FATAL: cannot fdopen";
our $THR_RES_FH; open $THR_RES_FH, "<&=$THR_RES_FD" or die "FATAL: cannot fdopen";

our $THR_REQ_W;
our $THR_RES_W = AnyEvent->io (fh => $THR_RES_FH, poll => 'r', cb => sub {
   my $sv = _read_res
      or return;

   $sv->();
});

our $THR_REQ_BUF;

sub _send_req($) {
   $THR_REQ_BUF .= $_[0];

   $THR_REQ_W ||= AnyEvent->io (fh => $THR_REQ_FH, poll => 'w', cb => sub {
      my $len = syswrite $THR_REQ_FH, $THR_REQ_BUF;
      substr $THR_REQ_BUF, 0, $len, "";

      undef $THR_REQ_W unless length $THR_REQ_BUF;
   });
}

=item AnyEvent::FastPing::ipv4_supported

Returns true if IPv4 is supported in this module and on this system.

=item AnyEvent::FastPing::ipv6_supported

Returns true if IPv6 is supported in this module and on this system.

=item AnyEvent::FastPing::icmp4_pktsize

Returns the number of bytes each IPv4 ping packet has.

=item AnyEvent::FastPing::icmp6_pktsize

Returns the number of bytes each IPv4 ping packet has.

=item AnyEvent::FastPing::icmp_ping [ranges...], $send_interval, $payload, \&callback

Ping the given IPv4 address ranges. Each range is an arrayref of the
form C<[lo, hi, interval]>, where C<lo> and C<hi> are octet strings with
either 4 octets (for IPv4 addresses) or 16 octets (for IPV6 addresses),
representing the lowest and highest address to ping (you can convert a
dotted-quad IPv4 address to this format by using C<inet_aton $address>. The
range C<interval> is the minimum time in seconds between pings to the
given range. If omitted, defaults to C<$send_interval>.

The C<$send_interval> is the minimum interval between sending any two
packets and is a way to make an overall rate limit. If omitted, pings will
be sent as fast as possible.

The C<$payload> is a 32 bit unsigned integer given as the ICMP ECHO
REQUEST ident and sequence numbers (in unspecified order :).

The request will be queued and all requests will be served by a background
thread in order. When all ranges have been pinged, the C<callback> will be
called.

Algorithm: Each range has an associated "next time to send packet"
time. The algorithm loops as long as there are ranges with hosts to be
pinged and always serves the range with the most urgent packet send
time. It will at most send one packet every C<$send_interval> seconds.

This will ensure that pings to the same range are nicely interleaved with
other ranges - this can help reduce per-subnet bandwidth while maintaining
an overall high packet rate.

The algorithm to send each packet is O(log n) on the number of ranges, so
even a large number of ranges (many thousands) is managable.

No storage is allocated per address.

Performance: On my 2 GHz Opteron system with a pretty average nvidia
gigabit network card I can ping around 60k to 200k adresses per second,
depending on routing decisions.

Example: ping 10.0.0.1-10.0.0.15 with at most 100 packets/s, and
11.0.0.1-11.0.255.255 with at most 1000 packets/s. Do not, however, exceed
1000 packets/s overall:

   my $done = AnyEvent->condvar;

   AnyEvent::FastPing::icmp_ping
      [
         [v10.0.0.1, v10.0.0.15, .01],
         [v11.0.0.1, v11.0.255.255, .001],
      ],
      .001, 0x12345678,
      sub {
         warn "all ranges pinged\n";
         $done->broadcast;
      }
   ;

   $done->wait;

=cut

sub icmp_ping($$$&) {
   _send_req _req_icmp_ping @_;
}

our $ICMP4_FH;
our $ICMP4_W = (open $ICMP4_FH, "<&=$ICMP4_FD") && AnyEvent->io (fh => $ICMP4_FH, poll => 'r', cb => \&_recv_icmp4);
our $ICMP6_FH;
our $ICMP6_W = (open $ICMP6_FH, "<&=$ICMP6_FD") && AnyEvent->io (fh => $ICMP6_FH, poll => 'r', cb => \&_recv_icmp6);

=item AnyEvent::FastPing::register_cb \&cb

Register a callback that is called for every received ping reply
(regardless of whether a ping is still in process or not and regardless of
whether the reply is actually a reply to a ping sent earlier).

The code reference gets a single parameter - an arrayref with an
entry for each received packet (replies are being batched for greater
efficiency). Each packet is represented by an arrayref with three members:
the source address (an octet string of either 4 (IPv4) or 16 (IPv6) octets
length), the payload as passed to C<icmp_ping> and the round trip time in
seconds.

Example: register a callback which simply dumps the received data. Since
the coderef is created on the fly via sub, it would be hard to unregister
this callback again :)

   AnyEvent::FastPing::register_cb sub {
      for (@{$_[0]}) {
         printf "%s %d %g\n",
            (4 == length $_->[0] ? inet_ntoa $_->[0] : Socket6::inet_ntop (&AF_INET6, $_->[0])),
            $_->[2],
            $_->[1];
      }
   };

Example: a single ping reply with payload of 1 from C<::1> gets passed
like this:

   [ [
     "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1",
     "0.000280141830444336",
     1
   ] ]

Example: ping replies for C<127.0.0.1> and C<127.0.0.2>, with a payload of
C<0x12345678>:

   [
      [
        "\177\0\0\1",
        "0.00015711784362793",
        305419896
      ],
      [
        "\177\0\0\2",
        "0.00090184211731",
        305419896
      ]
   ]

=item AnyEvent::FastPing::unregister_cb \&cb

Unregister the callback again (make sure you pass the same codereference
as to C<register_cb>).

=cut

our @CB;

sub register_cb($) {
   push @CB, $_[0];
}

sub unregister_cb($) {
   @CB = grep $_ != $_[0], @CB;
}

1;

=back

=head1 AUTHOR

   Marc Lehmann <schmorp@schmorp.de>
   http://home.schmorp.de/

=head1 LICENSE

   This software is distributed under the GENERAL PUBLIC LICENSE, version 2
   or any later version or, at your option, the Artistic License.

=cut

Revision:	1.8
Committed:	Wed Apr 7 14:13:16 2010 UTC (14 years, 1 month ago) by root
Branch:	MAIN
CVS Tags:	rel-1_13
Changes since 1.7:	+15 -2 lines
Log Message:	rel-1_13
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3			AnyEvent::FastPing - quickly ping a large number of hosts
4
5			=head1 SYNOPSIS
6
7			use AnyEvent::FastPing;
8
9			=head1 DESCRIPTION
10
11	root	1.2	This module was written for a single purpose only: sending ICMP ECHO
12	root	1.1	REQUEST packets as quickly as possible to a large number of hosts
13			(thousands to millions).
14
15			It employs a sending thread and is fully event-driven (using AnyEvent), so
16			you have to run an event model supported by AnyEvent to use this module.
17
18			=head1 FUNCTIONS
19
20			=over 4
21
22			=cut
23
24			package AnyEvent::FastPing;
25
26			use strict;
27			no warnings;
28
29			use AnyEvent;
30
31			BEGIN {
32	root	1.8	our $VERSION = '1.13';
33	root	1.1	our @ISA = qw(Exporter);
34
35			require Exporter;
36			#Exporter::export_ok_tags (keys %EXPORT_TAGS);
37
38			require XSLoader;
39			XSLoader::load (__PACKAGE__, $VERSION);
40			}
41
42			our ($THR_REQ_FD, $THR_RES_FD, $ICMP4_FD, $ICMP6_FD);
43
44			our $THR_REQ_FH; open $THR_REQ_FH, ">&=$THR_REQ_FD" or die "FATAL: cannot fdopen";
45			our $THR_RES_FH; open $THR_RES_FH, "<&=$THR_RES_FD" or die "FATAL: cannot fdopen";
46
47			our $THR_REQ_W;
48			our $THR_RES_W = AnyEvent->io (fh => $THR_RES_FH, poll => 'r', cb => sub {
49			my $sv = _read_res
50			or return;
51
52			$sv->();
53			});
54
55			our $THR_REQ_BUF;
56
57			sub _send_req($) {
58			$THR_REQ_BUF .= $_[0];
59
60			$THR_REQ_W \|\|= AnyEvent->io (fh => $THR_REQ_FH, poll => 'w', cb => sub {
61			my $len = syswrite $THR_REQ_FH, $THR_REQ_BUF;
62			substr $THR_REQ_BUF, 0, $len, "";
63
64			undef $THR_REQ_W unless length $THR_REQ_BUF;
65			});
66			}
67
68			=item AnyEvent::FastPing::ipv4_supported
69
70			Returns true if IPv4 is supported in this module and on this system.
71
72			=item AnyEvent::FastPing::ipv6_supported
73
74			Returns true if IPv6 is supported in this module and on this system.
75
76			=item AnyEvent::FastPing::icmp4_pktsize
77
78			Returns the number of bytes each IPv4 ping packet has.
79
80			=item AnyEvent::FastPing::icmp6_pktsize
81
82			Returns the number of bytes each IPv4 ping packet has.
83
84			=item AnyEvent::FastPing::icmp_ping [ranges...], $send_interval, $payload, \&callback
85
86			Ping the given IPv4 address ranges. Each range is an arrayref of the
87			form C<[lo, hi, interval]>, where C<lo> and C<hi> are octet strings with
88			either 4 octets (for IPv4 addresses) or 16 octets (for IPV6 addresses),
89			representing the lowest and highest address to ping (you can convert a
90			dotted-quad IPv4 address to this format by using C<inet_aton $address>. The
91			range C<interval> is the minimum time in seconds between pings to the
92			given range. If omitted, defaults to C<$send_interval>.
93
94			The C<$send_interval> is the minimum interval between sending any two
95			packets and is a way to make an overall rate limit. If omitted, pings will
96	root	1.5	be sent as fast as possible.
97	root	1.1
98			The C<$payload> is a 32 bit unsigned integer given as the ICMP ECHO
99			REQUEST ident and sequence numbers (in unspecified order :).
100
101			The request will be queued and all requests will be served by a background
102			thread in order. When all ranges have been pinged, the C<callback> will be
103			called.
104
105			Algorithm: Each range has an associated "next time to send packet"
106			time. The algorithm loops as long as there are ranges with hosts to be
107			pinged and always serves the range with the most urgent packet send
108			time. It will at most send one packet every C<$send_interval> seconds.
109
110			This will ensure that pings to the same range are nicely interleaved with
111			other ranges - this can help reduce per-subnet bandwidth while maintaining
112			an overall high packet rate.
113
114			The algorithm to send each packet is O(log n) on the number of ranges, so
115			even a large number of ranges (many thousands) is managable.
116
117			No storage is allocated per address.
118
119			Performance: On my 2 GHz Opteron system with a pretty average nvidia
120			gigabit network card I can ping around 60k to 200k adresses per second,
121			depending on routing decisions.
122
123			Example: ping 10.0.0.1-10.0.0.15 with at most 100 packets/s, and
124			11.0.0.1-11.0.255.255 with at most 1000 packets/s. Do not, however, exceed
125			1000 packets/s overall:
126
127			my $done = AnyEvent->condvar;
128
129			AnyEvent::FastPing::icmp_ping
130			[
131			[v10.0.0.1, v10.0.0.15, .01],
132			[v11.0.0.1, v11.0.255.255, .001],
133			],
134			.001, 0x12345678,
135			sub {
136			warn "all ranges pinged\n";
137			$done->broadcast;
138			}
139			;
140
141			$done->wait;
142
143			=cut
144
145			sub icmp_ping($$$&) {
146			_send_req _req_icmp_ping @_;
147			}
148
149			our $ICMP4_FH;
150			our $ICMP4_W = (open $ICMP4_FH, "<&=$ICMP4_FD") && AnyEvent->io (fh => $ICMP4_FH, poll => 'r', cb => \&_recv_icmp4);
151			our $ICMP6_FH;
152			our $ICMP6_W = (open $ICMP6_FH, "<&=$ICMP6_FD") && AnyEvent->io (fh => $ICMP6_FH, poll => 'r', cb => \&_recv_icmp6);
153
154			=item AnyEvent::FastPing::register_cb \&cb
155
156			Register a callback that is called for every received ping reply
157			(regardless of whether a ping is still in process or not and regardless of
158			whether the reply is actually a reply to a ping sent earlier).
159
160			The code reference gets a single parameter - an arrayref with an
161	root	1.6	entry for each received packet (replies are being batched for greater
162	root	1.1	efficiency). Each packet is represented by an arrayref with three members:
163			the source address (an octet string of either 4 (IPv4) or 16 (IPv6) octets
164			length), the payload as passed to C<icmp_ping> and the round trip time in
165			seconds.
166
167	root	1.8	Example: register a callback which simply dumps the received data. Since
168			the coderef is created on the fly via sub, it would be hard to unregister
169			this callback again :)
170
171			AnyEvent::FastPing::register_cb sub {
172			for (@{$_[0]}) {
173			printf "%s %d %g\n",
174			(4 == length $_->[0] ? inet_ntoa $_->[0] : Socket6::inet_ntop (&AF_INET6, $_->[0])),
175			$_->[2],
176			$_->[1];
177			}
178			};
179
180	root	1.1	Example: a single ping reply with payload of 1 from C<::1> gets passed
181			like this:
182
183			[ [
184			"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1",
185			"0.000280141830444336",
186			1
187			] ]
188
189			Example: ping replies for C<127.0.0.1> and C<127.0.0.2>, with a payload of
190			C<0x12345678>:
191
192			[
193			[
194			"\177\0\0\1",
195			"0.00015711784362793",
196			305419896
197			],
198			[
199			"\177\0\0\2",
200			"0.00090184211731",
201			305419896
202			]
203			]
204
205			=item AnyEvent::FastPing::unregister_cb \&cb
206
207			Unregister the callback again (make sure you pass the same codereference
208			as to C<register_cb>).
209
210			=cut
211
212			our @CB;
213
214	root	1.8	sub register_cb($) {
215	root	1.1	push @CB, $_[0];
216			}
217
218			sub unregister_cb($) {
219			@CB = grep $_ != $_[0], @CB;
220			}
221
222			1;
223
224			=back
225
226			=head1 AUTHOR
227
228	root	1.4	Marc Lehmann <schmorp@schmorp.de>
229			http://home.schmorp.de/
230	root	1.1
231	root	1.4	=head1 LICENSE
232	root	1.1
233	root	1.4	This software is distributed under the GENERAL PUBLIC LICENSE, version 2
234			or any later version or, at your option, the Artistic License.
235	root	1.1
236			=cut
237