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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/* $OpenBSD: ethers.c,v 1.25 2016/09/21 04:38:56 guenther Exp $ */
/*
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* ethers(3) a la Sun.
* Originally Written by Roland McGrath <roland@frob.com> 10/14/93.
* Substantially modified by Todd C. Miller <Todd.Miller@courtesan.com>
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <paths.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#ifdef YP
#include <rpcsvc/ypclnt.h>
#endif
#ifndef _PATH_ETHERS
#define _PATH_ETHERS "/etc/ethers"
#endif
static char * _ether_aton(const char *, struct ether_addr *);
char *
ether_ntoa(struct ether_addr *e)
{
static char a[] = "xx:xx:xx:xx:xx:xx";
(void)snprintf(a, sizeof a, "%02x:%02x:%02x:%02x:%02x:%02x",
e->ether_addr_octet[0], e->ether_addr_octet[1],
e->ether_addr_octet[2], e->ether_addr_octet[3],
e->ether_addr_octet[4], e->ether_addr_octet[5]);
return (a);
}
static char *
_ether_aton(const char *s, struct ether_addr *e)
{
int i;
long l;
char *pp;
while (isspace((unsigned char)*s))
s++;
/* expect 6 hex octets separated by ':' or space/NUL if last octet */
for (i = 0; i < 6; i++) {
l = strtol(s, &pp, 16);
if (pp == s || l > 0xFF || l < 0)
return (NULL);
if (!(*pp == ':' ||
(i == 5 && (isspace((unsigned char)*pp) ||
*pp == '\0'))))
return (NULL);
e->ether_addr_octet[i] = (u_char)l;
s = pp + 1;
}
/* return character after the octets ala strtol(3) */
return (pp);
}
struct ether_addr *
ether_aton(const char *s)
{
static struct ether_addr n;
return (_ether_aton(s, &n) ? &n : NULL);
}
int
ether_ntohost(char *hostname, struct ether_addr *e)
{
FILE *f;
char buf[BUFSIZ+1], *p;
size_t len;
struct ether_addr try;
#ifdef YP
char trybuf[sizeof("xx:xx:xx:xx:xx:xx")];
int trylen;
#endif
#ifdef YP
snprintf(trybuf, sizeof trybuf, "%x:%x:%x:%x:%x:%x",
e->ether_addr_octet[0], e->ether_addr_octet[1],
e->ether_addr_octet[2], e->ether_addr_octet[3],
e->ether_addr_octet[4], e->ether_addr_octet[5]);
trylen = strlen(trybuf);
#endif
f = fopen(_PATH_ETHERS, "re");
if (f == NULL)
return (-1);
while ((p = fgetln(f, &len)) != NULL) {
if (p[len-1] == '\n')
len--;
if (len > sizeof(buf) - 2)
continue;
(void)memcpy(buf, p, len);
buf[len] = '\n'; /* code assumes newlines later on */
buf[len+1] = '\0';
#ifdef YP
/* A + in the file means try YP now. */
if (!strncmp(buf, "+\n", sizeof(buf))) {
char *ypbuf, *ypdom;
int ypbuflen;
if (yp_get_default_domain(&ypdom))
continue;
if (yp_match(ypdom, "ethers.byaddr", trybuf,
trylen, &ypbuf, &ypbuflen))
continue;
if (ether_line(ypbuf, &try, hostname) == 0) {
free(ypbuf);
(void)fclose(f);
return (0);
}
free(ypbuf);
continue;
}
#endif
if (ether_line(buf, &try, hostname) == 0 &&
memcmp(&try, e, sizeof(try)) == 0) {
(void)fclose(f);
return (0);
}
}
(void)fclose(f);
errno = ENOENT;
return (-1);
}
int
ether_hostton(const char *hostname, struct ether_addr *e)
{
FILE *f;
char buf[BUFSIZ+1], *p;
char try[HOST_NAME_MAX+1];
size_t len;
#ifdef YP
int hostlen = strlen(hostname);
#endif
f = fopen(_PATH_ETHERS, "re");
if (f==NULL)
return (-1);
while ((p = fgetln(f, &len)) != NULL) {
if (p[len-1] == '\n')
len--;
if (len > sizeof(buf) - 2)
continue;
memcpy(buf, p, len);
buf[len] = '\n'; /* code assumes newlines later on */
buf[len+1] = '\0';
#ifdef YP
/* A + in the file means try YP now. */
if (!strncmp(buf, "+\n", sizeof(buf))) {
char *ypbuf, *ypdom;
int ypbuflen;
if (yp_get_default_domain(&ypdom))
continue;
if (yp_match(ypdom, "ethers.byname", hostname, hostlen,
&ypbuf, &ypbuflen))
continue;
if (ether_line(ypbuf, e, try) == 0) {
free(ypbuf);
(void)fclose(f);
return (0);
}
free(ypbuf);
continue;
}
#endif
if (ether_line(buf, e, try) == 0 && strcmp(hostname, try) == 0) {
(void)fclose(f);
return (0);
}
}
(void)fclose(f);
errno = ENOENT;
return (-1);
}
int
ether_line(const char *line, struct ether_addr *e, char *hostname)
{
char *p;
size_t n;
/* Parse "xx:xx:xx:xx:xx:xx" */
if ((p = _ether_aton(line, e)) == NULL || (*p != ' ' && *p != '\t'))
goto bad;
/* Now get the hostname */
while (isspace((unsigned char)*p))
p++;
if (*p == '\0')
goto bad;
n = strcspn(p, " \t\n");
if (n >= HOST_NAME_MAX+1)
goto bad;
strlcpy(hostname, p, n + 1);
return (0);
bad:
errno = EINVAL;
return (-1);
}
DEF_WEAK(ether_line);
|
