1 |
dpavlin |
61 |
#!/usr/bin/perl |
2 |
|
|
|
3 |
|
|
# based on http://www.perlmonks.org/index.pl?node_id=325248 |
4 |
|
|
|
5 |
|
|
use strict; |
6 |
|
|
use warnings; |
7 |
|
|
|
8 |
|
|
use IO::Socket::INET; |
9 |
|
|
use Net::DHCP::Packet; |
10 |
|
|
use Net::DHCP::Constants; |
11 |
|
|
use Data::Dump qw/dump/; |
12 |
|
|
|
13 |
|
|
die "need to run $0 as root like this\nsudo $0\n" unless $< == 0; |
14 |
|
|
|
15 |
|
|
my $debug = 1; |
16 |
|
|
|
17 |
|
|
my $sock = IO::Socket::INET->new( |
18 |
|
|
LocalPort => 67, |
19 |
|
|
# LocalAddr => 'localhost', |
20 |
|
|
# LocalAddr => '10.0.0.100', |
21 |
|
|
LocalAddr => '0.0.0.0', |
22 |
|
|
Proto => 'udp', |
23 |
|
|
ReuseAddr => 1, |
24 |
|
|
# PeerPort => getservbyname('bootpc', 'udp'), |
25 |
|
|
Broadcast => 1, |
26 |
|
|
Type => SOCK_DGRAM, |
27 |
|
|
) or die "Failed to bind to socket: $@"; |
28 |
|
|
|
29 |
|
|
my $device = 'eth1'; |
30 |
|
|
|
31 |
|
|
my $ip = '10.0.0.10'; |
32 |
|
|
my $ip_server = '10.0.0.100'; |
33 |
|
|
|
34 |
|
|
while (1) { |
35 |
|
|
|
36 |
|
|
print "waiting for BOOTP requests on ",$sock->sockhost,":",$sock->sockport,"\n"; |
37 |
|
|
|
38 |
|
|
my $buf; |
39 |
|
|
$sock->recv($buf, 1024); |
40 |
|
|
print "<< peer:",$sock->peerhost,":",$sock->peerport,"\n"; |
41 |
|
|
|
42 |
|
|
if (defined $buf) { |
43 |
|
|
|
44 |
|
|
my $dhcp; |
45 |
|
|
|
46 |
|
|
eval { $dhcp = Net::DHCP::Packet->new($buf); }; |
47 |
|
|
die "can't use request", dump( $buf ) if $@; |
48 |
|
|
|
49 |
|
|
if ( $debug ) { |
50 |
|
|
warn "recv: ", $dhcp->toString, "\n\n"; |
51 |
|
|
} |
52 |
|
|
|
53 |
|
|
my $packet = new Net::DHCP::Packet( |
54 |
|
|
Op => BOOTREPLY(), |
55 |
|
|
Hops => $dhcp->hops(), |
56 |
|
|
Xid => $dhcp->xid(), |
57 |
|
|
Flags => $dhcp->flags(), |
58 |
|
|
Ciaddr => $dhcp->ciaddr(), |
59 |
|
|
Yiaddr => $ip, |
60 |
|
|
Siaddr => $ip_server, |
61 |
|
|
Giaddr => $dhcp->giaddr(), |
62 |
|
|
Chaddr => $dhcp->chaddr(), |
63 |
|
|
File => $dhcp->file(), |
64 |
|
|
# DHO_DHCP_MESSAGE_TYPE() => DHCPACK(), |
65 |
|
|
DHO_SUBNET_MASK() => '255.0.0.0', |
66 |
|
|
); |
67 |
|
|
|
68 |
|
|
warn ">> ",$sock->peeraddr,":",$sock->peerport," send $ip with server $ip_server\n",$packet->toString(),"\n"; |
69 |
|
|
|
70 |
|
|
my $reply = IO::Socket::INET->new( |
71 |
|
|
LocalAddr => '10.0.0.100', |
72 |
|
|
LocalPort => 67, |
73 |
|
|
Proto => "udp", |
74 |
|
|
Broadcast => 1, |
75 |
|
|
PeerAddr => '255.255.255.255', |
76 |
|
|
PeerPort => 68, |
77 |
|
|
Reuse => 1, |
78 |
|
|
) or die "socket: $@"; |
79 |
|
|
|
80 |
|
|
|
81 |
|
|
my $buff = $packet->serialize(); |
82 |
|
|
$reply->send( $buff, 0 ) or die "Error sending: $!\n"; |
83 |
|
|
|
84 |
|
|
} else { |
85 |
|
|
print "No bootp request.\n"; |
86 |
|
|
} |
87 |
|
|
|
88 |
|
|
} |