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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* Embedded Linux library
* Copyright (C) 2020 Intel Corporation
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <signal.h>
#include <sys/socket.h>
#include <linux/if_arp.h>
#include <arpa/inet.h>
#include <ell/ell.h>
static bool terminating;
static struct l_timeout *timeout;
static struct l_dhcp6_client *client;
static void do_debug(const char *str, void *user_data)
{
const char *prefix = user_data;
l_info("%s%s", prefix, str);
}
static void main_loop_quit(struct l_timeout *timeout, void *user_data)
{
l_main_quit();
}
static void client_shutdown(void)
{
if (terminating)
return;
terminating = true;
timeout = l_timeout_create(1, main_loop_quit, NULL, NULL);
l_dhcp6_client_stop(client);
}
static void signal_handler(uint32_t signo, void *user_data)
{
switch (signo) {
case SIGINT:
case SIGTERM:
l_info("Terminate");
client_shutdown();
break;
}
}
static void print_lease(const struct l_dhcp6_lease *lease)
{
char *ip = l_dhcp6_lease_get_address(lease);
char **dns = l_dhcp6_lease_get_dns(lease);
uint32_t prefix_length = l_dhcp6_lease_get_prefix_length(lease);
l_info("Lease Obtained:");
l_info("\tIP: %s/%u", ip, prefix_length);
l_free(ip);
if (dns) {
char *dns_concat = l_strjoinv(dns, ',');
l_info("\tDNS List: %s", dns_concat);
l_free(dns_concat);
l_strfreev(dns);
} else
l_info("\tNo DNS information obtained");
}
static void event_handler(struct l_dhcp6_client *client,
enum l_dhcp6_client_event event,
void *userdata)
{
switch (event) {
case L_DHCP6_CLIENT_EVENT_IP_CHANGED:
l_info("IP changed");
/* Fall through */
case L_DHCP6_CLIENT_EVENT_LEASE_OBTAINED:
print_lease(l_dhcp6_client_get_lease(client));
break;
case L_DHCP6_CLIENT_EVENT_LEASE_EXPIRED:
l_info("Lease expired");
break;
case L_DHCP6_CLIENT_EVENT_LEASE_RENEWED:
l_info("Lease Renewed");
break;
case L_DHCP6_CLIENT_EVENT_NO_LEASE:
l_info("No lease available");
break;
}
}
int main(int argc, char *argv[])
{
struct in6_addr in6;
struct l_netlink *rtnl;
struct l_icmp6_client *icmp6;
int ifindex;
uint8_t mac[6];
char ll_str[INET6_ADDRSTRLEN];
if (argc < 2) {
fprintf(stderr, "Usage: %s <interface index>\n", argv[0]);
return EXIT_FAILURE;
}
ifindex = atoi(argv[1]);
if (!l_net_get_mac_address(ifindex, mac)) {
fprintf(stderr, "Unable to get address from interface %d\n",
ifindex);
return EXIT_FAILURE;
}
if (!l_net_get_link_local_address(ifindex, &in6)) {
fprintf(stderr, "Unable to get link-local address\n");
return EXIT_FAILURE;
}
inet_ntop(AF_INET6, &in6, ll_str, sizeof(ll_str));
fprintf(stdout, "Binding to Link-Local address: %s\n", ll_str);
l_log_set_stderr();
l_debug_enable("*");
if (!l_main_init())
return EXIT_FAILURE;
rtnl = l_netlink_new(NETLINK_ROUTE);
if (!rtnl) {
fprintf(stderr, "Failed to open RTNL\n");
return EXIT_FAILURE;
}
client = l_dhcp6_client_new(ifindex);
l_dhcp6_client_set_address(client, ARPHRD_ETHER, mac, 6);
l_dhcp6_client_set_link_local_address(client, ll_str);
l_dhcp6_client_set_event_handler(client, event_handler, NULL, NULL);
l_dhcp6_client_set_debug(client, do_debug, "[DHCP6] ", NULL);
l_dhcp6_client_set_lla_randomized(client, true);
l_dhcp6_client_set_rtnl(client, rtnl);
icmp6 = l_dhcp6_client_get_icmp6(client);
l_icmp6_client_set_rtnl(icmp6, rtnl);
l_icmp6_client_set_route_priority(icmp6, 300);
l_dhcp6_client_start(client);
l_main_run_with_signal(signal_handler, NULL);
l_timeout_remove(timeout);
l_dhcp6_client_destroy(client);
l_main_exit();
l_netlink_destroy(rtnl);
return EXIT_SUCCESS;
}
|
