NAME
Net::Packet::ICMPv4 - Internet Control Message Protocol v4 layer 4 object
SYNOPSIS
use Net::Packet::Consts qw(:icmpv4);
require Net::Packet::ICMPv4;
# Build echo-request header
my $echo = Net::Packet::ICMPv4->new(data => '0123456789');
# Build information-request header
my $info = Net::Packet::ICMPv4->new(
type => NP_ICMPv4_TYPE_INFORMATION_REQUEST,
data => '0123456789',
);
# Build address-mask request header
my $mask = Net::Packet::ICMPv4->new(
type => NP_ICMPv4_TYPE_ADDRESS_MASK_REQUEST,
data => '0123456789',
);
# Build timestamp request header
my $timestamp = Net::Packet::ICMPv4->new(
type => NP_ICMPv4_TYPE_TIMESTAMP_REQUEST,
data => '0123456789',
);
$timestamp->pack;
print 'RAW: '.unpack('H*', $timestamp->raw)."\n";
# Read a raw layer
my $layer = Net::Packet::ICMPv4->new(raw => $raw);
print $layer->print."\n";
print 'PAYLOAD: '.unpack('H*', $layer->payload)."\n"
if $layer->payload;DESCRIPTION
This modules implements the encoding and decoding of the ICMPv4 layer.
RFC: ftp://ftp.rfc-editor.org/in-notes/rfc792.txt
See also Net::Packet::Layer and Net::Packet::Layer4 for other attributes a nd methods.
ATTRIBUTES
- type
- code
-
Type and code fields. See CONSTANTS.
- checksum
-
The checksum of ICMPv4 header.
- identifier
-
Identification number.
- sequenceNumber
-
Sequence number.
- originateTimestamp
- receiveTimestamp
- transmitTimestamp
-
Three timestamps used by the NP_ICMPv4_TYPE_TIMESTAMP_REQUEST message.
- addressMask
-
Used by the NP_ICMPv4_TYPE_ADDRESS_MASK_REQUEST message.
- gateway
-
Used by the NP_ICMPv4_TYPE_REDIRECT message.
- unused
-
Zero value field used in various ICMP messages.
- error
-
A pointer to a Net::Packet::Frame object, usually set when an ICMP error message has been returned.
- data
-
Additionnal data can be added to an ICMP message, traditionnaly used in NP_ICMPv4_TYPE_ECHO_REQUEST.
METHODS
- new
-
Object constructor. You can pass attributes that will overwrite default ones. Default values:
type: NP_ICMPv4_TYPE_ECHO_REQUEST
code: NP_ICMPv4_CODE_ZERO
checksum: 0
identifier: getRandom16bitsInt()
sequenceNumber: getRandom16bitsInt()
originateTimestamp: time()
receiveTimestamp: 0
transmitTimestamp: 0
addressMask: 0
gateway: "127.0.0.1"
unused: 0
data: ""
- recv
-
Will search for a matching replies in framesSorted or frames from a Net::Packet::Dump object.
- getDataLength
-
Returns the length in bytes of data attribute.
- pack
-
Packs all attributes into a raw format, in order to inject to network. Returns 1 on success, undef otherwise.
- unpack
-
Unpacks raw data from network and stores attributes into the object. Returns 1 on success, undef otherwise.
- isTypeEchoRequest
- isTypeEchoReply
- isTypeTimestampRequest
- isTypeTimestampReply
- isTypeInformationRequest
- isTypeInformationReply
- isTypeAddressMaskRequest
- isTypeAddressMaskReply
- isTypeDestinationUnreachable
-
Returns 1 if the type attribute is of specified type.
CONSTANTS
Load them: use Net::Packet::Consts qw(:icmpv4);
- NP_ICMPv4_CODE_ZERO
-
ICMP code zero, used by various ICMP messages.
- NP_ICMPv4_TYPE_DESTINATION_UNREACHABLE
- NP_ICMPv4_CODE_NETWORK
- NP_ICMPv4_CODE_HOST
- NP_ICMPv4_CODE_PROTOCOL
- NP_ICMPv4_CODE_PORT
- NP_ICMPv4_CODE_FRAGMENTATION_NEEDED
- NP_ICMPv4_CODE_SOURCE_ROUTE_FAILED
-
Destination unreachable type, with possible code numbers.
- NP_ICMPv4_TYPE_REDIRECT
- NP_ICMPv4_CODE_FOR_NETWORK
- NP_ICMPv4_CODE_FOR_HOST
- NP_ICMPv4_CODE_FOR_TOS_AND_NETWORK
- NP_ICMPv4_CODE_FOR_TOS_AND_HOST
-
Redirect type message, with possible code numbers.
- NP_ICMPv4_TYPE_TIME_EXCEEDED
- NP_ICMPv4_CODE_TTL_IN_TRANSIT
- NP_ICMPv4_CODE_FRAGMENT_REASSEMBLY
-
Time exceeded message, with possible code numbers.
- NP_ICMPv4_TYPE_ECHO_REQUEST
- NP_ICMPv4_TYPE_ECHO_REPLY
- NP_ICMPv4_TYPE_TIMESTAMP_REQUEST
- NP_ICMPv4_TYPE_TIMESTAMP_REPLY
- NP_ICMPv4_TYPE_INFORMATION_REQUEST
- NP_ICMPv4_TYPE_INFORMATION_REPLY
- NP_ICMPv4_TYPE_ADDRESS_MASK_REQUEST
- NP_ICMPv4_TYPE_ADDRESS_MASK_REPLY
-
Other request/reply ICMP messages types.
AUTHOR
Patrice <GomoR> Auffret
COPYRIGHT AND LICENSE
Copyright (c) 2004-2015, Patrice <GomoR> Auffret
You may distribute this module under the terms of the Artistic license. See LICENSE.Artistic file in the source distribution archive.