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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
/* $OpenBSD: wake.c,v 1.11 2009/01/29 15:50:03 mbalmer Exp $ */
/*
* Copyright (C) 2006,2007,2008,2009 Marc Balmer <mbalmer@openbsd.org>
* Copyright (C) 2000 Eugene M. Kim. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Author's name may not be used endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/bpf.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#ifndef BPF_PATH_FORMAT
#define BPF_PATH_FORMAT "/dev/bpf%u"
#endif
#ifndef SYNC_LEN
#define SYNC_LEN 6
#endif
#ifndef DESTADDR_COUNT
#define DESTADDR_COUNT 16
#endif
__dead void usage(void);
int wake(const char *iface, const char *host);
int get_bpf(void);
int bind_if_to_bpf(char const *ifname, int bpf);
int get_ether(char const *text, struct ether_addr *addr);
int send_wakeup(int bpf, struct ether_addr const *addr);
void
usage(void)
{
extern char *__progname;
(void)fprintf(stderr, "usage: %s interface lladdr\n", __progname);
exit(0);
}
int
wake(const char *iface, const char *host)
{
int res, bpf;
struct ether_addr macaddr;
bpf = get_bpf();
if (bpf == -1)
return -1;
if (bind_if_to_bpf(iface, bpf) == -1 ||
get_ether(host, &macaddr) == -1) {
(void)close(bpf);
return -1;
}
res = send_wakeup(bpf, &macaddr);
(void)close(bpf);
return res;
}
int
get_bpf(void)
{
int i, fd;
char *path;
for (i = 0;; i++) {
if (asprintf(&path, BPF_PATH_FORMAT, i) == -1)
return -1;
fd = open(path, O_RDWR);
free(path);
if (fd != -1)
return fd;
if (errno == EBUSY)
continue;
break;
}
return -1;
}
int
bind_if_to_bpf(char const *ifname, int bpf)
{
struct ifreq ifr;
u_int dlt;
if (strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)) >=
sizeof(ifr.ifr_name))
return -1;
if (ioctl(bpf, BIOCSETIF, &ifr) == -1)
return -1;
if (ioctl(bpf, BIOCGDLT, &dlt) == -1)
return -1;
if (dlt != DLT_EN10MB)
return -1;
return 0;
}
int
get_ether(char const *text, struct ether_addr *addr)
{
struct ether_addr *paddr;
paddr = ether_aton(text);
if (paddr != NULL) {
*addr = *paddr;
return 0;
}
if (ether_hostton(text, addr))
return -1;
return 0;
}
int
send_wakeup(int bpf, struct ether_addr const *addr)
{
struct {
struct ether_header hdr;
u_char data[SYNC_LEN + ETHER_ADDR_LEN * DESTADDR_COUNT];
} pkt;
u_char *p;
int i;
ssize_t bw;
ssize_t len;
(void)memset(pkt.hdr.ether_dhost, 0xff, sizeof(pkt.hdr.ether_dhost));
pkt.hdr.ether_type = htons(0);
(void)memset(pkt.data, 0xff, SYNC_LEN);
for (p = pkt.data + SYNC_LEN, i = 0; i < DESTADDR_COUNT;
p += ETHER_ADDR_LEN, i++)
bcopy(addr->ether_addr_octet, p, ETHER_ADDR_LEN);
p = (u_char *)&pkt;
len = sizeof(pkt);
bw = 0;
while (len) {
if ((bw = write(bpf, &pkt, sizeof(pkt))) == -1)
return -1;
len -= bw;
p += bw;
}
return 0;
}
int
main(int argc, char *argv[])
{
if (argc != 3)
usage();
if (wake(argv[1], argv[2]))
err(1, "error sending Wake on LAN frame over %s to %s",
argv[1], argv[2]);
return 0;
}
|
