Install Now
Net::Libdnet - binding for Dug Song's libdnet
Contents
Constants
DNET_ADDR_TYPE_NONEDNET_ADDR_TYPE_ETHDNET_ADDR_TYPE_IPDNET_ADDR_TYPE_IP6DNET_FW_OP_ALLOWDNET_FW_OP_BLOCKDNET_FW_DIR_INDNET_FW_DIR_OUTDNET_INTF_TYPE_OTHERDNET_INTF_TYPE_ETHDNET_INTF_TYPE_LOOPBACKDNET_INTF_TYPE_TUNDNET_INTF_FLAG_UPDNET_INTF_FLAG_LOOPBACKDNET_INTF_FLAG_POINTOPOINTDNET_INTF_FLAG_NOARPDNET_INTF_FLAG_BROADCASTDNET_INTF_FLAG_MULTICAST
Copyright And License
You may distribute this module under the terms of the BSD license. See LICENSE file in the source
distribution archive.
Copyright (c) 2004, Vlad Manilici
Copyright (c) 2008-2024, Patrice <GomoR> Auffret
Description
Net::Libdnet provides a simplified, portable interface to several low-level networking routines,
including network address manipulation, kernel arp cache and route table lookup and manipulation, network
firewalling, network interface lookup and manipulation, network traffic interception via tunnel
interfaces, and raw IP packet and Ethernet frame transmission. It is intended to complement the
functionality provided by libpcap.
All the original and obsolete functions return undef and print a warning message to the standard error
when a problem occurs. The obsolete functions are: addr_cmp, addr_bcast, addr_net, arp_add, arp_delete,
arp_get, intf_get, intf_get_src, intf_get_dst, route_add, route_delete, route_get.
These obsolete functions will continue to work, to keep backward compatibility, but should not be used
anymore. The new APIs should be preferred. There are two new APIs, one is the low-level one, matching
libdnet functions, and the other one is a high-level API, matching a more Perl object oriented
programming. This latest one is highly preferred.
Net::Libdnet module implements the low-level API. The high-level API is accessible by using the following
modules: Net::Libdnet::Intf, Net::Libdnet::Route, Net::Libdnet::Fw, Net::Libdnet::Arp, Net::Libdnet::Eth,
Net::Libdnet::Ip and Net::Libdnet::Tun.
Name
Net::Libdnet - binding for Dug Song's libdnet
Obsolete Functions
They should not be used anymore. You have been warned.
addr_bcastaddr_cmpaddr_netarp_addarp_deletearp_getintf_getintf_get_dstintf_get_srcroute_addroute_deleteroute_getSee Also
dnet(3) perl v5.40.1 2025-03-01 Net::Libdnet(3pm)
Subroutines
dnet_intf_open ()
Opens an interface handle. Returns a handle on success, undef on error.
dnet_intf_get (scalar, hashref)
Takes an intf handle, and a hash ref in dnet format as parameters. Returns a hash in dnet format on
success, undef on error.
dnet_intf_get_src (scalar, scalar)
Takes an intf handle, and an IP address as parameters. Returns a hash in dnet format on success,
undef on error.
dnet_intf_get_dst (scalar, scalar)
Takes an intf handle, and an IP address as parameters. Returns a hash in dnet format on success,
undef on error.
dnet_intf_set (scalar, scalar)
Takes an intf handle, and a hash ref in dnet format as parameters. Returns 1 on success, undef on
error.
dnet_intf_loop (scalar, subref, scalarref)
Takes an intf handle, a subref, and a scalar ref as parameters. Returns 1 on success, undef on error.
The subref will be called with an intf hash ref in dnet format, and the scalar ref as parameters.
dnet_intf_close (scalar)
Takes an intf handle as parameter. Returns the handle on success, undef on error.
dnet_route_open ()
Opens a route handle. Returns a handle on success, undef on error.
dnet_route_add (scalar, hashref)
Takes a route handle, and a hash ref in dnet format as parameters. Returns 1 on success, undef on
error.
dnet_route_delete (scalar, hashref)
Takes a route handle, and a hash ref in dnet format as parameters. Returns 1 on success, undef on
error.
dnet_route_get (scalar, hashref)
Takes a route handle, and a hash ref in dnet format as parameters. Returns a hash ref in dnet format
on success, undef on error.
dnet_route_loop (scalar, subref, scalarref)
Takes a route handle, a subref, and a scalar ref as parameters. Returns 1 on success, undef on error.
The subref will be called with a route hash ref in dnet format, and the scalar ref as parameters.
dnet_route_close (scalar)
Takes a route handle as parameter. Returns the handle on success, undef on error.
dnet_arp_open ()
Opens an arp handle. Returns a handle on success, undef on error.
dnet_arp_add (scalar, hashref)
Takes an arp handle, and a hash ref in dnet format as parameters. Returns 1 on success, undef on
error.
dnet_arp_delete (scalar, hashref)
Takes an arp handle, and a hash ref in dnet format as parameters. Returns 1 on success, undef on
error.
dnet_arp_get (scalar, hashref)
Takes an arp handle, and a hash ref in dnet format as parameters. Returns a hash ref in dnet format
on success, undef on error.
dnet_arp_loop (scalar, subref, scalarref)
Takes an arp handle, a subref, and a scalar ref as parameters. Returns 1 on success, undef on error.
The subref will be called with an arp hash ref in dnet format, and the scalar ref as parameters.
dnet_arp_close (scalar)
Takes an arp handle as parameter. Returns the handle on success, undef on error.
dnet_fw_open ()
Opens a fw handle. Returns a handle on success, undef on error.
dnet_fw_add (scalar, hashref)
Takes a fw handle, and a hash ref in dnet format as parameters. Returns 1 on success, undef on error.
dnet_fw_delete (scalar, hashref)
Takes a fw handle, and a hash ref in dnet format as parameters. Returns 1 on success, undef on error.
dnet_fw_loop (scalar, subref, scalarref)
Takes a fw handle, a subref, and a scalar ref as parameters. Returns 1 on success, undef on error.
The subref will be called with a fw hash ref in dnet format, and the scalar ref as parameters.
dnet_fw_close (scalar)
Takes a fw handle as parameter. Returns the handle on success, undef on error.
dnet_tun_open (scalar, scalar, scalar)
Creates a tunnel between src and dst IP addresses. Captured packets will have specified size. First
argument is the source IP address, second the destination IP address, and the third is the cpature
size. Returns a handle on success, undef on error.
dnet_tun_fileno (scalar)
Takes a tun handle as parameter. Returns the file number on success, undef on error.
dnet_tun_name (scalar)
Takes a tun handle as parameter. Returns the interface name on success, undef on error.
dnet_tun_send (scalar, scalar, scalar)
Takes a tun handle, the raw data to send, and its size as parameters. Returns the number of bytes
sent on success, undef on error.
dnet_tun_recv (scalar, scalar)
Takes a tun handle, and the maximum size to read as parameters. Returns the read buffer on success,
undef on error.
dnet_tun_close (scalar)
Takes a tun handle as parameter. Returns the handle on success, undef on error.
dnet_eth_open (scalar)
Opens an eth handle. Takes an interface name as parameter. Returns a handle on success, undef on
error.
dnet_eth_get (scalar)
Takes an eth handle as parameter. Returns the hardware address of currently opened eth handle on
success, undef on error.
dnet_eth_set (scalar, scalar)
Takes an eth handle, and the hardware address to set as parameters. Returns 1 on success, undef on
error.
dnet_eth_send (scalar, scalar, scalar)
Takes an eth handle, the raw data to send, and its size as parameters. Returns the number of bytes
sent on success, undef on error.
dnet_eth_close (scalar)
Takes an eth handle as parameter. Returns the handle on success, undef on error.
dnet_ip_open ()
Opens an ip handle. Returns a handle on success, undef on error.
dnet_ip_checksum (scalar, scalar)
Takes a raw IPv4 frame as the first parameter, and its size as a second parameter. It then updates
the frame with the good checksum. Returns nothing.
dnet_ip_send (scalar, scalar, scalar)
Takes an ip handle, the raw data to send, and its size as parameters. Returns the number of bytes
sent on success, undef on error.
dnet_ip_close (scalar)
Takes an ip handle as parameter. Returns the handle on success, undef on error.
Synopsis
#
# This will just import every functions and constants
#
use Net::Libdnet;
#
# Network interface manipulation
#
# !!! ADVICE: you should use Net::Libdnet::Intf instead
#
use Net::Libdnet qw(:intf);
my $intf = dnet_intf_open();
my $eth = dnet_intf_get($intf, { intf_name => 'eth0' });
print "IP: ".$eth->{intf_addr}."\n";
print "MAC: ".$eth->{intf_link_addr}."\n";
my $dst = dnet_intf_get_dst($intf, '192.168.0.10');
print "Name: ".$dst->{intf_name}."\n";
print "IP: ".$dst->{intf_addr}."\n";
print "MAC: ".$dst->{intf_link_addr}."\n";
my $src = dnet_intf_get_src($intf, '192.168.0.1');
print "Name: ".$src->{intf_name}."\n";
print "IP: ".$src->{intf_addr}."\n";
print "MAC: ".$src->{intf_link_addr}."\n";
dnet_intf_close($intf);
#
# Arp cache manipulation
#
# !!! ADVICE: you should use Net::Libdnet::Arp instead
#
use Net::Libdnet qw(:arp);
my $arp = dnet_arp_open();
my $entry = dnet_arp_get($arp, {arp_pa => '10.0.0.1'});
print "MAC: ".$entry->{arp_ha}."\n";
dnet_arp_add ($arp,
{arp_ha => '00:11:22:33:44:55', arp_pa => '10.0.0.10'});
dnet_arp_delete($arp,
{arp_ha => '00:11:22:33:44:55', arp_pa => '10.0.0.10'});
dnet_arp_close($arp);
#
# Route table manipulation
#
# !!! ADVICE: you should use Net::Libdnet::Route instead
#
use Net::Libdnet qw(:route);
my $route = dnet_route_open();
dnet_route_add ($route,
{route_gw => '10.0.0.1', route_dst => '192.168.0.1'});
dnet_route_delete($route,
{route_gw => '10.0.0.1', route_dst => '192.168.0.1'});
my $get = dnet_route_get($route, {route_dst => '192.168.0.10'});
print "GW: ".$get->{route_gw}."\n";
dnet_route_close($route);
#
# Firewall rules manipulation
#
# !!! ADVICE: you should use Net::Libdnet::Fw instead
#
use Net::Libdnet qw(:fw :consts);
my $fw = dnet_fw_open();
# This is quite complex. This rule blocks TCP as input to 10.0.0.1
# You should really use Net::Libdnet::Fw instead.
dnet_fw_add ($fw,
{fw_op => FW_DIR_IN, fw_proto => 6, fw_dst => '10.0.0.1'});
dnet_fw_delete($fw,
{fw_op => FW_DIR_IN, fw_proto => 6, fw_dst => '10.0.0.1'});
dnet_fw_close($fw);
#
# Send at IP level
#
# !!! ADVICE: you should use Net::Libdnet::Ip instead
#
use Net::Libdnet qw(:ip);
my $ip = dnet_ip_open();
my $raw = "\x47\x47\x47\x47";
dnet_ip_send($ip, $raw, length($raw));
dnet_ip_close($ip);
#
# Send at Ethernet level
#
# !!! ADVICE: you should use Net::Libdnet::Eth instead
#
use Net::Libdnet qw(:eth);
my $eth = dnet_eth_open('eth0');
dnet_eth_send($eth, $raw, length($raw));
dnet_eth_close($eth);
#
# Traffic interception
#
# !!! ADVICE: you should use Net::Libdnet::Tun instead
#
use Net::Libdnet qw(:tun);
my $tun = dnet_tun_open('10.0.0.10', '192.168.0.10', 1500);
my $buf = dnet_tun_recv($tun, 1500);
# Do stuff with $buf
dnet_tun_send($tun, $buf, length($buf));
dnet_tun_close($tun);
#
# hash refs in dnet format
#
my $intf = {
intf_alias_num => 1,
intf_mtu => 1500,
intf_len => 112,
intf_type => 6,
intf_name => 'eth0',
intf_dst_addr => undef,
intf_link_addr => '00:11:22:33:44:55',
intf_flags => 49,
intf_addr => '10.100.0.10/24',
intf_alias_addrs => [ 'fe80::211:2ff:fe33:4455/64' ]
};
my $arp = {
arp_pa => '10.100.0.1',
arp_ha => '11:22:33:44:55:66'
};
my $route = {
route_gw => '10.100.0.1',
route_dst => '0.0.0.0/0'
};
my $fw = {
fw_dir => 2,
fw_sport => [ 0, 0 ],
fw_dport => [ 0, 0 ],
fw_src => '0.0.0.0/0',
fw_dst => '0.0.0.0/0',
fw_proto => 6,
fw_device => 'eth0',
fw_op => 2
};
What Is Implemented
Networkaddressing
Nothing as of now.
AddressResolutionProtocol
All functions: arp_open, arp_add, arp_delete, arp_get, arp_loop, arp_close.
Binarybuffers
Nothing as of now.
Ethernet
All functions: eth_open, eth_get, eth_set, eth_send, eth_close.
Firewalling
All functions: fw_open, fw_add, fw_delete, fw_loop, fw_close.
Networkinterface
All functions: intf_open, intf_get_set, intf_get_dst, intf_set, intf_loop, intf_close.
InternetProtocol
All functions: ip_open, ip_checksum, ip_send, ip_close.
Except: ip_add_option.
InternetProtocolVersion6
Nothing as of now.
Randomnumbergeneration
Nothing as of now.
Routing
All functions: route_open, route_add, route_delete, route_get, route_loop, route_close.
Tunnelinterface
All functions: tun_open, tun_fileno, tun_name, tun_send, tun_recv, tun_close.
PNG Icons
