1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
// Mgmt
// Copyright (C) 2013-2024+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"context"
"fmt"
"log"
"net"
"os"
"github.com/insomniacslk/dhcp/dhcpv4"
"github.com/insomniacslk/dhcp/dhcpv4/nclient4"
)
const (
iface = "lo" // loopback for local testing
address = "127.0.0.1"
)
func main() {
if len(os.Args) < 2 || len(os.Args) > 3 {
log.Printf("Usage: %s [port] <mac address>", os.Args[0])
return
}
port := string(nclient4.ServerPort) // the default is 67
if len(os.Args) >= 3 {
port = os.Args[1]
}
hwAddr := os.Args[len(os.Args)-1] // argv[1]
hw, err := net.ParseMAC(hwAddr)
if err != nil {
log.Printf("Invalid mac address: %v", err)
return
}
addr := fmt.Sprintf("%s:%s", address, port)
log.Printf("Connecting to: %s", addr)
opts := []nclient4.ClientOpt{}
{
opt := nclient4.WithHWAddr(hw)
opts = append(opts, opt)
}
{
opt := nclient4.WithSummaryLogger()
opts = append(opts, opt)
}
//{
// opt := nclient4.WithDebugLogger()
// opts = append(opts, opt)
//}
//c, err := nclient4.NewWithConn(conn net.PacketConn, ifaceHWAddr net.HardwareAddr, opts...)
c, err := nclient4.New(iface, opts...)
if err != nil {
log.Printf("Error connecting to server: %v", err)
return
}
defer func() {
if err := c.Close(); err != nil {
log.Printf("Error closing client: %v", err)
}
}()
modifiers := []dhcpv4.Modifier{}
//{
// mod := dhcpv4.WithYourIP(net.ParseIP(?))
// modifiers = append(modifiers, mod)
//}
//{
// mod := dhcpv4.WithClientIP(net.ParseIP(?))
// modifiers = append(modifiers, mod)
//}
// TODO: add modifiers
log.Printf("Requesting...")
ctx := context.Background() // TODO: add to ^C handler
lease, err := c.Request(ctx, modifiers...) // (lease *Lease, err error)
if err != nil {
log.Printf("Error requesting from server: %v", err)
return
}
// Show the results of the D-O-R-A exchange.
log.Printf("Offer: %+v", lease.Offer)
log.Printf("Ack: %+v", lease.ACK)
log.Printf("Done!")
}
|
