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
|
/*
* eth-bsd.c
*
* Copyright (c) 2001 Dug Song <dugsong@monkey.org>
*
* $Id: eth-bsd.c 630 2006-02-02 04:17:39Z dugsong $
*/
#include "config.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_ROUTE_RT_MSGHDR)
#include <sys/sysctl.h>
#include <net/route.h>
#include <net/if_dl.h>
#endif
#include <net/bpf.h>
#include <net/if.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "dnet.h"
struct eth_handle {
int fd;
char device[16];
};
eth_t *
eth_open(const char *device)
{
struct ifreq ifr;
char file[32];
eth_t *e;
int i;
if ((e = calloc(1, sizeof(*e))) != NULL) {
for (i = 0; i < 128; i++) {
snprintf(file, sizeof(file), "/dev/bpf%d", i);
/* This would be O_WRONLY, but Mac OS X 10.6 has a bug
where that prevents other users of the interface
from seeing incoming traffic, even in other
processes. */
e->fd = open(file, O_RDWR);
if (e->fd != -1 || errno != EBUSY)
break;
}
if (e->fd < 0)
return (eth_close(e));
memset(&ifr, 0, sizeof(ifr));
strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(e->fd, BIOCSETIF, (char *)&ifr) < 0)
return (eth_close(e));
#ifdef BIOCSHDRCMPLT
i = 1;
if (ioctl(e->fd, BIOCSHDRCMPLT, &i) < 0)
return (eth_close(e));
#endif
strlcpy(e->device, device, sizeof(e->device));
}
return (e);
}
ssize_t
eth_send(eth_t *e, const void *buf, size_t len)
{
return (write(e->fd, buf, len));
}
eth_t *
eth_close(eth_t *e)
{
if (e != NULL) {
if (e->fd >= 0)
close(e->fd);
free(e);
}
return (NULL);
}
#if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_ROUTE_RT_MSGHDR)
int
eth_get(eth_t *e, eth_addr_t *ea)
{
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
struct addr ha;
u_char *p, *buf;
size_t len;
int mib[] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
return (-1);
if ((buf = malloc(len)) == NULL)
return (-1);
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
free(buf);
return (-1);
}
for (p = buf; p < buf + len; p += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)p;
sdl = (struct sockaddr_dl *)(ifm + 1);
if (ifm->ifm_type != RTM_IFINFO ||
(ifm->ifm_addrs & RTA_IFP) == 0)
continue;
if (sdl->sdl_family != AF_LINK || sdl->sdl_nlen == 0 ||
memcmp(sdl->sdl_data, e->device, sdl->sdl_nlen) != 0)
continue;
if (addr_ston((struct sockaddr *)sdl, &ha) == 0)
break;
}
free(buf);
if (p >= buf + len) {
errno = ESRCH;
return (-1);
}
memcpy(ea, &ha.addr_eth, sizeof(*ea));
return (0);
}
#else
int
eth_get(eth_t *e, eth_addr_t *ea)
{
errno = ENOSYS;
return (-1);
}
#endif
#if defined(SIOCSIFLLADDR)
int
eth_set(eth_t *e, const eth_addr_t *ea)
{
struct ifreq ifr;
struct addr ha;
ha.addr_type = ADDR_TYPE_ETH;
ha.addr_bits = ETH_ADDR_BITS;
memcpy(&ha.addr_eth, ea, ETH_ADDR_LEN);
memset(&ifr, 0, sizeof(ifr));
strlcpy(ifr.ifr_name, e->device, sizeof(ifr.ifr_name));
addr_ntos(&ha, &ifr.ifr_addr);
return (ioctl(e->fd, SIOCSIFLLADDR, &ifr));
}
#else
int
eth_set(eth_t *e, const eth_addr_t *ea)
{
errno = ENOSYS;
return (-1);
}
#endif
|
