1 |
|
|
/* $OpenBSD: ethers.c,v 1.25 2016/09/21 04:38:56 guenther Exp $ */ |
2 |
|
|
|
3 |
|
|
/* |
4 |
|
|
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> |
5 |
|
|
* |
6 |
|
|
* Permission to use, copy, modify, and distribute this software for any |
7 |
|
|
* purpose with or without fee is hereby granted, provided that the above |
8 |
|
|
* copyright notice and this permission notice appear in all copies. |
9 |
|
|
* |
10 |
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 |
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 |
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 |
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 |
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 |
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 |
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 |
|
|
*/ |
18 |
|
|
|
19 |
|
|
/* |
20 |
|
|
* ethers(3) a la Sun. |
21 |
|
|
* Originally Written by Roland McGrath <roland@frob.com> 10/14/93. |
22 |
|
|
* Substantially modified by Todd C. Miller <Todd.Miller@courtesan.com> |
23 |
|
|
*/ |
24 |
|
|
|
25 |
|
|
#include <sys/types.h> |
26 |
|
|
#include <sys/socket.h> |
27 |
|
|
#include <net/if.h> |
28 |
|
|
#include <netinet/in.h> |
29 |
|
|
#include <netinet/if_ether.h> |
30 |
|
|
#include <paths.h> |
31 |
|
|
#include <errno.h> |
32 |
|
|
#include <stdio.h> |
33 |
|
|
#include <stdlib.h> |
34 |
|
|
#include <string.h> |
35 |
|
|
#include <ctype.h> |
36 |
|
|
#include <limits.h> |
37 |
|
|
#ifdef YP |
38 |
|
|
#include <rpcsvc/ypclnt.h> |
39 |
|
|
#endif |
40 |
|
|
|
41 |
|
|
#ifndef _PATH_ETHERS |
42 |
|
|
#define _PATH_ETHERS "/etc/ethers" |
43 |
|
|
#endif |
44 |
|
|
|
45 |
|
|
static char * _ether_aton(const char *, struct ether_addr *); |
46 |
|
|
|
47 |
|
|
char * |
48 |
|
|
ether_ntoa(struct ether_addr *e) |
49 |
|
|
{ |
50 |
|
|
static char a[] = "xx:xx:xx:xx:xx:xx"; |
51 |
|
|
|
52 |
|
|
(void)snprintf(a, sizeof a, "%02x:%02x:%02x:%02x:%02x:%02x", |
53 |
|
|
e->ether_addr_octet[0], e->ether_addr_octet[1], |
54 |
|
|
e->ether_addr_octet[2], e->ether_addr_octet[3], |
55 |
|
|
e->ether_addr_octet[4], e->ether_addr_octet[5]); |
56 |
|
|
|
57 |
|
|
return (a); |
58 |
|
|
} |
59 |
|
|
|
60 |
|
|
static char * |
61 |
|
|
_ether_aton(const char *s, struct ether_addr *e) |
62 |
|
|
{ |
63 |
|
|
int i; |
64 |
|
|
long l; |
65 |
|
|
char *pp; |
66 |
|
|
|
67 |
|
|
while (isspace((unsigned char)*s)) |
68 |
|
|
s++; |
69 |
|
|
|
70 |
|
|
/* expect 6 hex octets separated by ':' or space/NUL if last octet */ |
71 |
|
|
for (i = 0; i < 6; i++) { |
72 |
|
|
l = strtol(s, &pp, 16); |
73 |
|
|
if (pp == s || l > 0xFF || l < 0) |
74 |
|
|
return (NULL); |
75 |
|
|
if (!(*pp == ':' || |
76 |
|
|
(i == 5 && (isspace((unsigned char)*pp) || |
77 |
|
|
*pp == '\0')))) |
78 |
|
|
return (NULL); |
79 |
|
|
e->ether_addr_octet[i] = (u_char)l; |
80 |
|
|
s = pp + 1; |
81 |
|
|
} |
82 |
|
|
|
83 |
|
|
/* return character after the octets ala strtol(3) */ |
84 |
|
|
return (pp); |
85 |
|
|
} |
86 |
|
|
|
87 |
|
|
struct ether_addr * |
88 |
|
|
ether_aton(const char *s) |
89 |
|
|
{ |
90 |
|
|
static struct ether_addr n; |
91 |
|
|
|
92 |
|
|
return (_ether_aton(s, &n) ? &n : NULL); |
93 |
|
|
} |
94 |
|
|
|
95 |
|
|
int |
96 |
|
|
ether_ntohost(char *hostname, struct ether_addr *e) |
97 |
|
|
{ |
98 |
|
|
FILE *f; |
99 |
|
|
char buf[BUFSIZ+1], *p; |
100 |
|
|
size_t len; |
101 |
|
|
struct ether_addr try; |
102 |
|
|
#ifdef YP |
103 |
|
|
char trybuf[sizeof("xx:xx:xx:xx:xx:xx")]; |
104 |
|
|
int trylen; |
105 |
|
|
#endif |
106 |
|
|
|
107 |
|
|
#ifdef YP |
108 |
|
|
snprintf(trybuf, sizeof trybuf, "%x:%x:%x:%x:%x:%x", |
109 |
|
|
e->ether_addr_octet[0], e->ether_addr_octet[1], |
110 |
|
|
e->ether_addr_octet[2], e->ether_addr_octet[3], |
111 |
|
|
e->ether_addr_octet[4], e->ether_addr_octet[5]); |
112 |
|
|
trylen = strlen(trybuf); |
113 |
|
|
#endif |
114 |
|
|
|
115 |
|
|
f = fopen(_PATH_ETHERS, "re"); |
116 |
|
|
if (f == NULL) |
117 |
|
|
return (-1); |
118 |
|
|
while ((p = fgetln(f, &len)) != NULL) { |
119 |
|
|
if (p[len-1] == '\n') |
120 |
|
|
len--; |
121 |
|
|
if (len > sizeof(buf) - 2) |
122 |
|
|
continue; |
123 |
|
|
(void)memcpy(buf, p, len); |
124 |
|
|
buf[len] = '\n'; /* code assumes newlines later on */ |
125 |
|
|
buf[len+1] = '\0'; |
126 |
|
|
#ifdef YP |
127 |
|
|
/* A + in the file means try YP now. */ |
128 |
|
|
if (!strncmp(buf, "+\n", sizeof(buf))) { |
129 |
|
|
char *ypbuf, *ypdom; |
130 |
|
|
int ypbuflen; |
131 |
|
|
|
132 |
|
|
if (yp_get_default_domain(&ypdom)) |
133 |
|
|
continue; |
134 |
|
|
if (yp_match(ypdom, "ethers.byaddr", trybuf, |
135 |
|
|
trylen, &ypbuf, &ypbuflen)) |
136 |
|
|
continue; |
137 |
|
|
if (ether_line(ypbuf, &try, hostname) == 0) { |
138 |
|
|
free(ypbuf); |
139 |
|
|
(void)fclose(f); |
140 |
|
|
return (0); |
141 |
|
|
} |
142 |
|
|
free(ypbuf); |
143 |
|
|
continue; |
144 |
|
|
} |
145 |
|
|
#endif |
146 |
|
|
if (ether_line(buf, &try, hostname) == 0 && |
147 |
|
|
memcmp(&try, e, sizeof(try)) == 0) { |
148 |
|
|
(void)fclose(f); |
149 |
|
|
return (0); |
150 |
|
|
} |
151 |
|
|
} |
152 |
|
|
(void)fclose(f); |
153 |
|
|
errno = ENOENT; |
154 |
|
|
return (-1); |
155 |
|
|
} |
156 |
|
|
|
157 |
|
|
int |
158 |
|
|
ether_hostton(const char *hostname, struct ether_addr *e) |
159 |
|
|
{ |
160 |
|
|
FILE *f; |
161 |
|
|
char buf[BUFSIZ+1], *p; |
162 |
|
|
char try[HOST_NAME_MAX+1]; |
163 |
|
|
size_t len; |
164 |
|
|
#ifdef YP |
165 |
|
|
int hostlen = strlen(hostname); |
166 |
|
|
#endif |
167 |
|
|
|
168 |
|
|
f = fopen(_PATH_ETHERS, "re"); |
169 |
|
|
if (f==NULL) |
170 |
|
|
return (-1); |
171 |
|
|
|
172 |
|
|
while ((p = fgetln(f, &len)) != NULL) { |
173 |
|
|
if (p[len-1] == '\n') |
174 |
|
|
len--; |
175 |
|
|
if (len > sizeof(buf) - 2) |
176 |
|
|
continue; |
177 |
|
|
memcpy(buf, p, len); |
178 |
|
|
buf[len] = '\n'; /* code assumes newlines later on */ |
179 |
|
|
buf[len+1] = '\0'; |
180 |
|
|
#ifdef YP |
181 |
|
|
/* A + in the file means try YP now. */ |
182 |
|
|
if (!strncmp(buf, "+\n", sizeof(buf))) { |
183 |
|
|
char *ypbuf, *ypdom; |
184 |
|
|
int ypbuflen; |
185 |
|
|
|
186 |
|
|
if (yp_get_default_domain(&ypdom)) |
187 |
|
|
continue; |
188 |
|
|
if (yp_match(ypdom, "ethers.byname", hostname, hostlen, |
189 |
|
|
&ypbuf, &ypbuflen)) |
190 |
|
|
continue; |
191 |
|
|
if (ether_line(ypbuf, e, try) == 0) { |
192 |
|
|
free(ypbuf); |
193 |
|
|
(void)fclose(f); |
194 |
|
|
return (0); |
195 |
|
|
} |
196 |
|
|
free(ypbuf); |
197 |
|
|
continue; |
198 |
|
|
} |
199 |
|
|
#endif |
200 |
|
|
if (ether_line(buf, e, try) == 0 && strcmp(hostname, try) == 0) { |
201 |
|
|
(void)fclose(f); |
202 |
|
|
return (0); |
203 |
|
|
} |
204 |
|
|
} |
205 |
|
|
(void)fclose(f); |
206 |
|
|
errno = ENOENT; |
207 |
|
|
return (-1); |
208 |
|
|
} |
209 |
|
|
|
210 |
|
|
int |
211 |
|
|
ether_line(const char *line, struct ether_addr *e, char *hostname) |
212 |
|
|
{ |
213 |
|
|
char *p; |
214 |
|
|
size_t n; |
215 |
|
|
|
216 |
|
|
/* Parse "xx:xx:xx:xx:xx:xx" */ |
217 |
|
|
if ((p = _ether_aton(line, e)) == NULL || (*p != ' ' && *p != '\t')) |
218 |
|
|
goto bad; |
219 |
|
|
|
220 |
|
|
/* Now get the hostname */ |
221 |
|
|
while (isspace((unsigned char)*p)) |
222 |
|
|
p++; |
223 |
|
|
if (*p == '\0') |
224 |
|
|
goto bad; |
225 |
|
|
n = strcspn(p, " \t\n"); |
226 |
|
|
if (n >= HOST_NAME_MAX+1) |
227 |
|
|
goto bad; |
228 |
|
|
strlcpy(hostname, p, n + 1); |
229 |
|
|
return (0); |
230 |
|
|
|
231 |
|
|
bad: |
232 |
|
|
errno = EINVAL; |
233 |
|
|
return (-1); |
234 |
|
|
} |
235 |
|
|
DEF_WEAK(ether_line); |