1/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <nss.h>
20#include <ctype.h>
21#include <errno.h>
22#include <string.h>
23#include <libc-lock.h>
24#include <rpcsvc/yp.h>
25#include <rpcsvc/ypclnt.h>
26#include <netinet/ether.h>
27#include <netinet/if_ether.h>
28
29#include "nss-nis.h"
30
31/* Protect global state against multiple changers */
32__libc_lock_define_initialized (static, lock)
33
34/* Get the declaration of the parser function. */
35#define ENTNAME etherent
36#define STRUCTURE etherent
37#define EXTERN_PARSER
38#include <nss/nss_files/files-parse.c>
39
40struct response
41{
42 struct response *next;
43 char val[0];
44};
45
46static struct response *start;
47static struct response *next;
48
49static int
50saveit (int instatus, char *inkey, int inkeylen, char *inval,
51 int invallen, char *indata)
52{
53 if (instatus != YP_TRUE)
54 return 1;
55
56 if (inkey && inkeylen > 0 && inval && invallen > 0)
57 {
58 struct response *newp = malloc (sizeof (struct response) + invallen + 1);
59 if (newp == NULL)
60 return 1; /* We have no error code for out of memory */
61
62 if (start == NULL)
63 start = newp;
64 else
65 next->next = newp;
66 next = newp;
67
68 newp->next = NULL;
69 *((char *) mempcpy (newp->val, inval, invallen)) = '\0';
70 }
71
72 return 0;
73}
74
75static void
76internal_nis_endetherent (void)
77{
78 while (start != NULL)
79 {
80 next = start;
81 start = start->next;
82 free (next);
83 }
84}
85
86enum nss_status
87_nss_nis_endetherent (void)
88{
89 __libc_lock_lock (lock);
90
91 internal_nis_endetherent ();
92 next = NULL;
93
94 __libc_lock_unlock (lock);
95
96 return NSS_STATUS_SUCCESS;
97}
98
99static enum nss_status
100internal_nis_setetherent (void)
101{
102 char *domainname;
103 struct ypall_callback ypcb;
104 enum nss_status status;
105
106 yp_get_default_domain (&domainname);
107
108 internal_nis_endetherent ();
109
110 ypcb.foreach = saveit;
111 ypcb.data = NULL;
112 status = yperr2nss (yp_all (domainname, "ethers.byname", &ypcb));
113 next = start;
114
115 return status;
116}
117
118enum nss_status
119_nss_nis_setetherent (int stayopen)
120{
121 enum nss_status result;
122
123 __libc_lock_lock (lock);
124
125 result = internal_nis_setetherent ();
126
127 __libc_lock_unlock (lock);
128
129 return result;
130}
131
132static enum nss_status
133internal_nis_getetherent_r (struct etherent *eth, char *buffer, size_t buflen,
134 int *errnop)
135{
136 struct parser_data *data = (void *) buffer;
137 int parse_res;
138
139 if (start == NULL)
140 internal_nis_setetherent ();
141
142 /* Get the next entry until we found a correct one. */
143 do
144 {
145 char *p;
146
147 if (next == NULL)
148 return NSS_STATUS_NOTFOUND;
149
150 p = strncpy (buffer, next->val, buflen);
151
152 while (isspace (*p))
153 ++p;
154
155 parse_res = _nss_files_parse_etherent (p, eth, data, buflen, errnop);
156 if (parse_res == -1)
157 return NSS_STATUS_TRYAGAIN;
158 next = next->next;
159 }
160 while (!parse_res);
161
162 return NSS_STATUS_SUCCESS;
163}
164
165enum nss_status
166_nss_nis_getetherent_r (struct etherent *result, char *buffer, size_t buflen,
167 int *errnop)
168{
169 int status;
170
171 __libc_lock_lock (lock);
172
173 status = internal_nis_getetherent_r (result, buffer, buflen, errnop);
174
175 __libc_lock_unlock (lock);
176
177 return status;
178}
179
180enum nss_status
181_nss_nis_gethostton_r (const char *name, struct etherent *eth,
182 char *buffer, size_t buflen, int *errnop)
183{
184 if (name == NULL)
185 {
186 *errnop = EINVAL;
187 return NSS_STATUS_UNAVAIL;
188 }
189
190 char *domain;
191 if (__glibc_unlikely (yp_get_default_domain (&domain)))
192 return NSS_STATUS_UNAVAIL;
193
194 char *result;
195 int len;
196 int yperr = yp_match (domain, "ethers.byname", name, strlen (name), &result,
197 &len);
198
199 if (__glibc_unlikely (yperr != YPERR_SUCCESS))
200 {
201 enum nss_status retval = yperr2nss (yperr);
202
203 if (retval == NSS_STATUS_TRYAGAIN)
204 *errnop = errno;
205 return retval;
206 }
207
208 if (__glibc_unlikely ((size_t) (len + 1) > buflen))
209 {
210 free (result);
211 *errnop = ERANGE;
212 return NSS_STATUS_TRYAGAIN;
213 }
214
215 char *p = strncpy (buffer, result, len);
216 buffer[len] = '\0';
217 while (isspace (*p))
218 ++p;
219 free (result);
220
221 int parse_res = _nss_files_parse_etherent (p, eth, (void *) buffer, buflen,
222 errnop);
223 if (__glibc_unlikely (parse_res < 1))
224 {
225 if (parse_res == -1)
226 return NSS_STATUS_TRYAGAIN;
227 else
228 return NSS_STATUS_NOTFOUND;
229 }
230 return NSS_STATUS_SUCCESS;
231}
232
233enum nss_status
234_nss_nis_getntohost_r (const struct ether_addr *addr, struct etherent *eth,
235 char *buffer, size_t buflen, int *errnop)
236{
237 if (addr == NULL)
238 {
239 *errnop = EINVAL;
240 return NSS_STATUS_UNAVAIL;
241 }
242
243 char *domain;
244 if (__glibc_unlikely (yp_get_default_domain (&domain)))
245 return NSS_STATUS_UNAVAIL;
246
247 char buf[33];
248 int nlen = snprintf (buf, sizeof (buf), "%x:%x:%x:%x:%x:%x",
249 (int) addr->ether_addr_octet[0],
250 (int) addr->ether_addr_octet[1],
251 (int) addr->ether_addr_octet[2],
252 (int) addr->ether_addr_octet[3],
253 (int) addr->ether_addr_octet[4],
254 (int) addr->ether_addr_octet[5]);
255
256 char *result;
257 int len;
258 int yperr = yp_match (domain, "ethers.byaddr", buf, nlen, &result, &len);
259
260 if (__glibc_unlikely (yperr != YPERR_SUCCESS))
261 {
262 enum nss_status retval = yperr2nss (yperr);
263
264 if (retval == NSS_STATUS_TRYAGAIN)
265 *errnop = errno;
266 return retval;
267 }
268
269 if (__glibc_unlikely ((size_t) (len + 1) > buflen))
270 {
271 free (result);
272 *errnop = ERANGE;
273 return NSS_STATUS_TRYAGAIN;
274 }
275
276 char *p = strncpy (buffer, result, len);
277 buffer[len] = '\0';
278 while (isspace (*p))
279 ++p;
280 free (result);
281
282 int parse_res = _nss_files_parse_etherent (p, eth, (void *) buffer, buflen,
283 errnop);
284 if (__glibc_unlikely (parse_res < 1))
285 {
286 if (parse_res == -1)
287 return NSS_STATUS_TRYAGAIN;
288 else
289 return NSS_STATUS_NOTFOUND;
290 }
291 return NSS_STATUS_SUCCESS;
292}
293