Net::Libdnet(3)

NAME
Net::Libdnet - binding for Dug Song's libdnet

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
   };

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 osbsolete functions will continue to work, to keep backward compatibility, but should not be used anymore. The new APIs should be prefered. 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 prefered.

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.

WHAT IS IMPLEMENTED

Network addressing
    Nothing as of now.

Address Resolution Protocol
    All functions: arp_open, arp_add, arp_delete, arp_get, arp_loop, arp_close.

Binary buffers
    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.

Network interface
    All functions: intf_open, intf_get_set, intf_get_dst, intf_set, intf_loop, intf_close.

Internet Protocol
    All functions: ip_open, ip_checksum, ip_send, ip_close.

    Except: ip_add_option.

Internet Protocol Version 6
    Nothing as of now.

Random number generation
    Nothing as of now.

Routing
    All functions: route_open, route_add, route_delete, route_get, route_loop, route_close.

Tunnel interface
    All functions: tun_open, tun_fileno, tun_name, tun_send, tun_recv, tun_close.

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.

OBSOLETE FUNCTIONS
They should not be used anymore. You have been warned.

addr_bcast
addr_cmp
addr_net
arp_add
arp_delete
arp_get
intf_get
intf_get_dst
intf_get_src
route_add
route_delete
route_get

CONSTANTS

DNET_ADDR_TYPE_NONE
DNET_ADDR_TYPE_ETH
DNET_ADDR_TYPE_IP
DNET_ADDR_TYPE_IP6
DNET_FW_OP_ALLOW
DNET_FW_OP_BLOCK
DNET_FW_DIR_IN
DNET_FW_DIR_OUT
DNET_INTF_TYPE_OTHER
DNET_INTF_TYPE_ETH
DNET_INTF_TYPE_LOOPBACK
DNET_INTF_TYPE_TUN
DNET_INTF_FLAG_UP
DNET_INTF_FLAG_LOOPBACK
DNET_INTF_FLAG_POINTOPOINT
DNET_INTF_FLAG_NOARP
DNET_INTF_FLAG_BROADCAST
DNET_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) 2008-2011, Patrice <GomoR> Auffret

SEE ALSO
dnet(3)