Net::RawIP - Perl extension for manipulate raw ip packets with interface to libpcap
use Net::RawIP;
$n = Net::RawIP->new({
ip => {
saddr => 'my.target.lan',
daddr => 'my.target.lan',
},
});
tcp => {
source => 139,
dest => 139,
psh => 1,
syn => 1,
},
});
$n->send;
$n->ethnew("eth0");
$n->ethset(source => 'my.target.lan', dest =>'my.target.lan');
$n->ethsend;
$p = $n->pcapinit("eth0", "dst port 21", 1500, 30);
$f = dump_open($p, "/my/home/log");
loop($p, 10, \&dump, $f);
This package provides a class object which can be used for creating, manipulating and sending raw ip packets with optional features for manipulating ethernet headers.
NOTE: Ethernet related methods are implemented on Linux and *BSD only
PCAP_ERRBUF_SIZE PCAP_VERSION_MAJOR PCAP_VERSION_MINOR lib_pcap_h
open_live open_offline dump_open lookupdev lookupnet dispatch loop dump compile setfilter next datalink snapshot is_swapped major_version minor_version stats file fileno perror geterr strerror close dump_close timem linkoffset ifaddrlist rdev
By default exported functions are the loop, dispatch, dump_open, dump, open_live, timem, linkoffset, ifaddrlist, rdev. You have to use the export tag pcap for export all of the pcap functions. Please read the docs for the libpcap and look at Net::RawIP::libpcap(3pm).
Please look at the examples in the examples/ folder of the distribution.
Net::RawIP->new({
ARGPROTO => {PROTOKEY => PROTOVALUE,...}
ip => {IPKEY => IPVALUE,...},
})
ARGPROTO is one of (tcp, udp, icmp, generic) defining the protcol of the current packet. Defaults to tcp.
You can NOT change protocol in the object after its creation. Unless you want your packet to be TCP, you must set the protocol type in the new() call.
The possible values of PROTOKEY depend on the value of ARGPROTO
If ARGPROTO is <tcp> PROTOKEY can be one of (source, dest, seq, ack_seq, doff, res1, res2, urg, ack, psh, rst, syn, fin, window, check, urg_ptr, data).
If ARGPROTO is icmp PROTOKEY can be one of (type, code, check, gateway, id, sequence, unused, mtu, data).
If ARGPROTO is udp PROTOKEY can be one of (source, dest, len, check, data)
If ARGPROTO is generic PROTOKEY can be data only.
The data entries are scalars containing packed network byte order data.
As the real icmp packet is a C union one can specify specify only one of the following set of values.
The default values are
(0,0,0,0,5,0,0,0,0,0,0,0,0,0xffff,0,0,'') for tcp
(0,0,0,0,0,0,0,0,'') for icmp
(0,0,0,0,'') for udp
('') for generic
The valid values for urg ack psh rst syn fin are 0 or 1. The value of data is a string. Length of the result packet will be calculated if you do not specify non-zero value for tot_len.
The value of ip is a hash defining the parameters of the IP header (iphdr) in the current IP packet.
IPKEY is one of (version, ihl, tos, tot_len, id, frag_off, ttl, protocol, check, saddr, daddr). You can to specify any and all of the above parameters. If check is not given checksum will be calculated automatically.
The values of the saddr and the daddr can be hostname (e.g. www.oracle.com ) or IP address (205.227.44.16), and even the integer value if you happen to know what is 205.227.44.16 as an unsigned int in the host format ;).
Examples:
my $rawip = Net::RawIP->new({udp =>{}});
or
my $rawip = Net::RawIP->new({ip => { tos => 22 }, udp => { source => 22,dest =>23 } });
The default values of the ip hash are
(4,5,16,0,0,0x4000,64,6,0,0,0) for tcp
(4,5,16,0,0,0x4000,64,17,0,0,0) for udp
(4,5,16,0,0,0x4000,64,1,0,0,0) for icmp
(4,5,16,0,0,0x4000,64,0,0,0,0) for generic
timem() returns a string that looks like sec.microsec, where the sec and the microsec are the values returned by gettimeofday(3). If microsec is less than 100000 then zeros will be added to the left side of microsec for adjusting to six digits.
Similar to sprintf("%.6f", Time::HiRes::time());
TODO: replace this function with use of Time::HiRes ?
is a method for get the parameters from the current object. This method returns the array which will be filled with an asked parameters in order as they have ordered in packet if you'd call it with an array context. If this method is called with a scalar context then it returns a hash reference. In that hash will stored an asked parameters as values,the keys are their names.
The input parameter is a hash reference. In this hash can be three keys. They are a ip and an one of the ARGPROTOs. The value must be an array reference. This array contain asked parameters. E.g. you want to know current value of the tos from the iphdr and the flags of the tcphdr. Here is a code :
($tos,$urg,$ack,$psh,$rst,$syn,$fin) = $packet->get({
ip => [qw(tos)],
tcp => [qw(psh syn urg ack rst fin)]
});
The members in the array can be given in any order.
For get the ethernet parameters you have to use the key eth and the values of the array (dest,source,proto). The values of the dest and the source will look like the output of the ifconfig(8) e.g. 00:00:E8:43:0B:2A.
is a method which has used for send raw ip packet. The input parameters are the delay seconds and the times for repeating send. If you do not specify parameters for the send,then packet will be sent once without delay. If you do specify for the times a negative value then packet will be sent forever. E.g. you want to send the packet for ten times with delay equal to one second. Here is a code :
$packet->send(1,10); The delay could be specified not only as integer but and as 0.25 for sleep to 250 ms or 3.5 to sleep for 3 seconds and 500 ms.
is a method for init the ethernet subclass in the current object, $device is a required parameter,dest and source are an optional, $device is an ethernet device e.g. eth0, an ARGOFDEST and an ARGOFSOURCE are a the ethernet addresses in the ethernet header of the current object.
The ARGOFDEST and the ARGOFSOURCE can be given as a string which contain just 6 bytes of the real ethernet address or like the output of the ifconfig(8) e.g. 00:00:E8:43:0B:2A or just an ip address or a hostname of a target, then a mac address will be discovered automatically.
The ethernet frame will be sent with given addresses. By default the source and the dest will be filled with a hardware address of the $device.
NOTE: For use methods which are related to the ethernet you have to before initialize ethernet subclass by ethnew.
is a method for get an IP and a TCP options. The parameters for the optget must be given as key-value pairs. The OPTPROTO is the prototype of the options(ip,tcp),the values are the hashes references.The key is the type.The value of the type is an array reference. The return value is an array which will be filled with asked types,lengths,datas of the each type of the option in order as you have asked.If you do not specify type then all types,lengths,datas of an options will be returned. E.g. you want to know all the IP options from the current object. Here is a code:
@opts = $n->optget(ip => {});
E.g. you want to know just the IP options with the type which equal to 131 and 137. Here is a code:
($t131,$l131,$d131,$t137,$l137,$d137) = $n->optget( ip =>{ type =>[(131,137)] } );
is a method for unset a subclass of the IP or the TCP options from a current object.It can be used if you won't use options in the current object later. This method must be used only after the optset. The parameters for this method are the OPTPROTO's. E.g. you want to unset an IP options. Here is a code:
$n->optunset('ip');
E.g. you want to unset a TCP and an IP options. Here is a code:
$n->optunset('ip','tcp');
Sergey Kolychev <ksv@al.lg.ua>
Current Maintainer: Gabor Szabo <gabor@pti.co.il>
Copyright (c) 1998-2006 Sergey Kolychev. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Steve Bonds <u5rhsiz02@sneakemail.com> + work on some endianness bugs and improving code comments
perl(1),Net::RawIP::libpcap(3pm),tcpdump(1),RFC 791-793,RFC 768.
Net::Pcap, Net::Pcap::Reassemble, Net::PcapUtils Net::Pcap::FindDevice