source: vendor/current/nsswitch/wins.c

Last change on this file was 989, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.7
File size: 7.9 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 a WINS nsswitch module
4 Copyright (C) Andrew Tridgell 1999
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18
19*/
20
21#include "includes.h"
22#include "nsswitch/winbind_nss.h"
23#include "nsswitch/libwbclient/wbclient.h"
24
25#ifdef HAVE_NS_API_H
26
27#include <ns_daemon.h>
28#endif
29
30#if HAVE_PTHREAD_H
31#include <pthread.h>
32#endif
33
34#if HAVE_PTHREAD
35static pthread_mutex_t wins_nss_mutex = PTHREAD_MUTEX_INITIALIZER;
36#endif
37
38#ifndef INADDRSZ
39#define INADDRSZ 4
40#endif
41
42NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname,
43 struct hostent *he,
44 char *buffer,
45 size_t buflen,
46 int *errnop,
47 int *h_errnop);
48NSS_STATUS _nss_wins_gethostbyname2_r(const char *name,
49 int af,
50 struct hostent *he,
51 char *buffer,
52 size_t buflen,
53 int *errnop,
54 int *h_errnop);
55
56static char *lookup_byname_backend(const char *name)
57{
58 const char *p;
59 char *ip, *ipp;
60 size_t nbt_len;
61 wbcErr result;
62
63 nbt_len = strlen(name);
64 if (nbt_len > MAX_NETBIOSNAME_LEN - 1) {
65 return NULL;
66 }
67 p = strchr(name, '.');
68 if (p != NULL) {
69 return NULL;
70 }
71
72 result = wbcResolveWinsByName(name, &ip);
73 if (result != WBC_ERR_SUCCESS) {
74 return NULL;
75 }
76
77 ipp = strchr(ip, '\t');
78 if (ipp != NULL) {
79 *ipp = '\0';
80 }
81
82 return ip;
83}
84
85#ifdef HAVE_NS_API_H
86
87static char *lookup_byaddr_backend(const char *ip)
88{
89 wbcErr result;
90 char *name = NULL;
91
92 result = wbcResolveWinsByIP(ip, &name);
93 if (result != WBC_ERR_SUCCESS) {
94 return NULL;
95 }
96
97 return name;
98}
99
100/* IRIX version */
101
102int init(void)
103{
104 bool ok;
105
106 nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
107
108 ok = nss_wins_init();
109 if (!ok) {
110 return NSD_ERROR;
111 }
112
113 return NSD_OK;
114}
115
116int lookup(nsd_file_t *rq)
117{
118 char *map;
119 char *key;
120 char *addr;
121 int i, count, len, size;
122 char response[1024];
123 bool found = False;
124
125 nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
126 if (! rq)
127 return NSD_ERROR;
128
129 map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
130 if (! map) {
131 rq->f_status = NS_FATAL;
132 return NSD_ERROR;
133 }
134
135 key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
136 if (! key || ! *key) {
137 rq->f_status = NS_FATAL;
138 return NSD_ERROR;
139 }
140
141 response[0] = '\0';
142 len = sizeof(response) - 2;
143
144 /*
145 * response needs to be a string of the following format
146 * ip_address[ ip_address]*\tname[ alias]*
147 */
148 if (strcasecmp_m(map,"hosts.byaddr") == 0) {
149 char *name;
150
151 name = lookup_byaddr_backend(key);
152 if (name != NULL) {
153 size = strlen(key) + 1;
154 if (size > len) {
155 return NSD_ERROR;
156 }
157 len -= size;
158 strncat(response,key,size);
159 strncat(response,"\t",1);
160
161 size = strlen(name) + 1;
162 if (size > len) {
163 return NSD_ERROR;
164 }
165 len -= size;
166 strncat(response, name, size);
167 strncat(response, " ", 1);
168 found = True;
169 }
170 response[strlen(response)-1] = '\n';
171 } else if (strcasecmp_m(map,"hosts.byname") == 0) {
172 char *ip;
173
174 ip = lookup_byname_backend(key);
175 if (ip != NULL) {
176 size = strlen(ip) + 1;
177 if (size > len) {
178 wbcFreeMemory(ip);
179 return NSD_ERROR;
180 }
181 len -= size;
182 strncat(response,ip,size);
183 strncat(response,"\t",1);
184 size = strlen(key) + 1;
185 wbcFreeMemory(ip);
186 if (size > len) {
187 return NSD_ERROR;
188 }
189 strncat(response,key,size);
190 strncat(response,"\n",1);
191
192 found = True;
193 }
194 }
195
196 if (found) {
197 nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
198 nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
199 return NSD_OK;
200 }
201 nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
202 rq->f_status = NS_NOTFOUND;
203 return NSD_NEXT;
204}
205
206#else
207
208/* Allocate some space from the nss static buffer. The buffer and buflen
209 are the pointers passed in by the C library to the _nss_*_*
210 functions. */
211
212static char *get_static(char **buffer, size_t *buflen, size_t len)
213{
214 char *result;
215
216 /* Error check. We return false if things aren't set up right, or
217 there isn't enough buffer space left. */
218
219 if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
220 return NULL;
221 }
222
223 /* Return an index into the static buffer */
224
225 result = *buffer;
226 *buffer += len;
227 *buflen -= len;
228
229 return result;
230}
231
232/****************************************************************************
233gethostbyname() - we ignore any domain portion of the name and only
234handle names that are at most 15 characters long
235 **************************************************************************/
236NSS_STATUS
237_nss_wins_gethostbyname_r(const char *hostname,
238 struct hostent *he,
239 char *buffer,
240 size_t buflen,
241 int *errnop,
242 int *h_errnop)
243{
244 NSS_STATUS nss_status = NSS_STATUS_SUCCESS;
245 char *ip;
246 struct in_addr in;
247 int i;
248 fstring name;
249 size_t namelen;
250 int rc;
251
252#if HAVE_PTHREAD
253 pthread_mutex_lock(&wins_nss_mutex);
254#endif
255
256 memset(he, '\0', sizeof(*he));
257 fstrcpy(name, hostname);
258
259 /* Do lookup */
260
261 ip = lookup_byname_backend(name);
262 if (ip == NULL) {
263 *errnop = EINVAL;
264 *h_errnop = NETDB_INTERNAL;
265 nss_status = NSS_STATUS_NOTFOUND;
266 goto out;
267 }
268
269 rc = inet_pton(AF_INET, ip, &in);
270 wbcFreeMemory(ip);
271 if (rc == 0) {
272 *errnop = errno;
273 *h_errnop = NETDB_INTERNAL;
274 nss_status = NSS_STATUS_TRYAGAIN;
275 goto out;
276 }
277
278 /* Copy h_name */
279
280 namelen = strlen(name) + 1;
281
282 if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL) {
283 *errnop = EAGAIN;
284 *h_errnop = NETDB_INTERNAL;
285 nss_status = NSS_STATUS_TRYAGAIN;
286 goto out;
287 }
288
289 memcpy(he->h_name, name, namelen);
290
291 /* Copy h_addr_list, align to pointer boundary first */
292
293 if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
294 i = sizeof(char*) - i;
295
296 if (get_static(&buffer, &buflen, i) == NULL) {
297 *errnop = EAGAIN;
298 *h_errnop = NETDB_INTERNAL;
299 nss_status = NSS_STATUS_TRYAGAIN;
300 goto out;
301 }
302
303 if ((he->h_addr_list = (char **)get_static(
304 &buffer, &buflen, 2 * sizeof(char *))) == NULL) {
305 *errnop = EAGAIN;
306 *h_errnop = NETDB_INTERNAL;
307 nss_status = NSS_STATUS_TRYAGAIN;
308 goto out;
309 }
310
311 if ((he->h_addr_list[0] = get_static(&buffer, &buflen,
312 INADDRSZ)) == NULL) {
313 *errnop = EAGAIN;
314 *h_errnop = NETDB_INTERNAL;
315 nss_status = NSS_STATUS_TRYAGAIN;
316 goto out;
317 }
318
319 memcpy(he->h_addr_list[0], &in, INADDRSZ);
320
321 he->h_addr_list[1] = NULL;
322
323 /* Set h_addr_type and h_length */
324
325 he->h_addrtype = AF_INET;
326 he->h_length = INADDRSZ;
327
328 /* Set h_aliases */
329
330 if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
331 i = sizeof(char*) - i;
332
333 if (get_static(&buffer, &buflen, i) == NULL) {
334 *errnop = EAGAIN;
335 *h_errnop = NETDB_INTERNAL;
336 nss_status = NSS_STATUS_TRYAGAIN;
337 goto out;
338 }
339
340 if ((he->h_aliases = (char **)get_static(
341 &buffer, &buflen, sizeof(char *))) == NULL) {
342 *errnop = EAGAIN;
343 *h_errnop = NETDB_INTERNAL;
344 nss_status = NSS_STATUS_TRYAGAIN;
345 goto out;
346 }
347
348 he->h_aliases[0] = NULL;
349
350 *h_errnop = NETDB_SUCCESS;
351 nss_status = NSS_STATUS_SUCCESS;
352
353 out:
354
355#if HAVE_PTHREAD
356 pthread_mutex_unlock(&wins_nss_mutex);
357#endif
358 return nss_status;
359}
360
361
362NSS_STATUS
363_nss_wins_gethostbyname2_r(const char *name,
364 int af,
365 struct hostent *he,
366 char *buffer,
367 size_t buflen,
368 int *errnop,
369 int *h_errnop)
370{
371 NSS_STATUS nss_status;
372
373 if(af!=AF_INET) {
374 *errnop = EAFNOSUPPORT;
375 *h_errnop = NO_DATA;
376 nss_status = NSS_STATUS_UNAVAIL;
377 } else {
378 nss_status = _nss_wins_gethostbyname_r(name,
379 he,
380 buffer,
381 buflen,
382 errnop,
383 h_errnop);
384 }
385 return nss_status;
386}
387#endif
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