source: vendor/current/nsswitch/wins.c@ 605

Last change on this file since 605 was 427, checked in by Silvan Scherrer, 16 years ago

Samba 3.5.x: update to 3.5.2
File size: 10.2 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#ifdef HAVE_NS_API_H
23
24#include <ns_daemon.h>
25#endif
26
27#if HAVE_PTHREAD_H
28#include <pthread.h>
29#endif
30
31#if HAVE_PTHREAD
32static pthread_mutex_t wins_nss_mutex = PTHREAD_MUTEX_INITIALIZER;
33#endif
34
35#ifndef INADDRSZ
36#define INADDRSZ 4
37#endif
38
39static int initialised;
40
41extern bool AllowDebugChange;
42
43NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
44 char *buffer, size_t buflen, int *h_errnop);
45NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
46 char *buffer, size_t buflen, int *h_errnop);
47
48/* Use our own create socket code so we don't recurse.... */
49
50static int wins_lookup_open_socket_in(void)
51{
52 struct sockaddr_in sock;
53 int val=1;
54 int res;
55
56 memset((char *)&sock,'\0',sizeof(sock));
57
58#ifdef HAVE_SOCK_SIN_LEN
59 sock.sin_len = sizeof(sock);
60#endif
61 sock.sin_port = 0;
62 sock.sin_family = AF_INET;
63 sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
64 res = socket(AF_INET, SOCK_DGRAM, 0);
65 if (res == -1)
66 return -1;
67
68 if (setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val)) != 0) {
69 close(res);
70 return -1;
71 }
72#ifdef SO_REUSEPORT
73 if (setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val)) != 0) {
74 close(res);
75 return -1;
76 }
77#endif /* SO_REUSEPORT */
78
79 /* now we've got a socket - we need to bind it */
80
81 if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
82 close(res);
83 return(-1);
84 }
85
86 set_socket_options(res,"SO_BROADCAST");
87
88 return res;
89}
90
91
92static void nss_wins_init(void)
93{
94 initialised = 1;
95 DEBUGLEVEL = 0;
96 AllowDebugChange = False;
97
98 TimeInit();
99 setup_logging("nss_wins",False);
100 load_case_tables();
101 lp_load(get_dyn_CONFIGFILE(),True,False,False,True);
102 load_interfaces();
103}
104
105static struct in_addr *lookup_byname_backend(const char *name, int *count)
106{
107 int fd = -1;
108 struct ip_service *address = NULL;
109 struct in_addr *ret = NULL;
110 int j, flags = 0;
111
112 if (!initialised) {
113 nss_wins_init();
114 }
115
116 *count = 0;
117
118 /* always try with wins first */
119 if (NT_STATUS_IS_OK(resolve_wins(name,0x00,&address,count))) {
120 if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
121 free( address );
122 return NULL;
123 }
124 if (address[0].ss.ss_family != AF_INET) {
125 free(address);
126 free(ret);
127 return NULL;
128 }
129 *ret = ((struct sockaddr_in *)&address[0].ss)->sin_addr;
130 free( address );
131 return ret;
132 }
133
134 fd = wins_lookup_open_socket_in();
135 if (fd == -1) {
136 return NULL;
137 }
138
139 /* uggh, we have to broadcast to each interface in turn */
140 for (j=iface_count() - 1;j >= 0;j--) {
141 const struct in_addr *bcast = iface_n_bcast_v4(j);
142 struct sockaddr_storage ss;
143 struct sockaddr_storage *pss;
144 if (!bcast) {
145 continue;
146 }
147 in_addr_to_sockaddr_storage(&ss, *bcast);
148 pss = name_query(fd,name,0x00,True,True,&ss,count, &flags, NULL);
149 if (pss) {
150 if ((ret = SMB_MALLOC_P(struct in_addr)) == NULL) {
151 return NULL;
152 }
153 *ret = ((struct sockaddr_in *)pss)->sin_addr;
154 break;
155 }
156 }
157
158 close(fd);
159 return ret;
160}
161
162#ifdef HAVE_NS_API_H
163
164static NODE_STATUS_STRUCT *lookup_byaddr_backend(char *addr, int *count)
165{
166 int fd;
167 struct sockaddr_storage ss;
168 struct nmb_name nname;
169 NODE_STATUS_STRUCT *status;
170
171 if (!initialised) {
172 nss_wins_init();
173 }
174
175 fd = wins_lookup_open_socket_in();
176 if (fd == -1)
177 return NULL;
178
179 make_nmb_name(&nname, "*", 0);
180 if (!interpret_string_addr(&ss, addr, AI_NUMERICHOST)) {
181 return NULL;
182 }
183 status = node_status_query(fd, &nname, &ss, count, NULL);
184
185 close(fd);
186 return status;
187}
188
189/* IRIX version */
190
191int init(void)
192{
193 nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
194 nss_wins_init();
195 return NSD_OK;
196}
197
198int lookup(nsd_file_t *rq)
199{
200 char *map;
201 char *key;
202 char *addr;
203 struct in_addr *ip_list;
204 NODE_STATUS_STRUCT *status;
205 int i, count, len, size;
206 char response[1024];
207 bool found = False;
208
209 nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
210 if (! rq)
211 return NSD_ERROR;
212
213 map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
214 if (! map) {
215 rq->f_status = NS_FATAL;
216 return NSD_ERROR;
217 }
218
219 key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
220 if (! key || ! *key) {
221 rq->f_status = NS_FATAL;
222 return NSD_ERROR;
223 }
224
225 response[0] = '\0';
226 len = sizeof(response) - 2;
227
228 /*
229 * response needs to be a string of the following format
230 * ip_address[ ip_address]*\tname[ alias]*
231 */
232 if (StrCaseCmp(map,"hosts.byaddr") == 0) {
233 if ( status = lookup_byaddr_backend(key, &count)) {
234 size = strlen(key) + 1;
235 if (size > len) {
236 free(status);
237 return NSD_ERROR;
238 }
239 len -= size;
240 strncat(response,key,size);
241 strncat(response,"\t",1);
242 for (i = 0; i < count; i++) {
243 /* ignore group names */
244 if (status[i].flags & 0x80) continue;
245 if (status[i].type == 0x20) {
246 size = sizeof(status[i].name) + 1;
247 if (size > len) {
248 free(status);
249 return NSD_ERROR;
250 }
251 len -= size;
252 strncat(response, status[i].name, size);
253 strncat(response, " ", 1);
254 found = True;
255 }
256 }
257 response[strlen(response)-1] = '\n';
258 free(status);
259 }
260 } else if (StrCaseCmp(map,"hosts.byname") == 0) {
261 if (ip_list = lookup_byname_backend(key, &count)) {
262 for (i = count; i ; i--) {
263 addr = inet_ntoa(ip_list[i-1]);
264 size = strlen(addr) + 1;
265 if (size > len) {
266 free(ip_list);
267 return NSD_ERROR;
268 }
269 len -= size;
270 if (i != 0)
271 response[strlen(response)-1] = ' ';
272 strncat(response,addr,size);
273 strncat(response,"\t",1);
274 }
275 size = strlen(key) + 1;
276 if (size > len) {
277 free(ip_list);
278 return NSD_ERROR;
279 }
280 strncat(response,key,size);
281 strncat(response,"\n",1);
282 found = True;
283 free(ip_list);
284 }
285 }
286
287 if (found) {
288 nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
289 nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
290 return NSD_OK;
291 }
292 nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
293 rq->f_status = NS_NOTFOUND;
294 return NSD_NEXT;
295}
296
297#else
298
299/* Allocate some space from the nss static buffer. The buffer and buflen
300 are the pointers passed in by the C library to the _nss_*_*
301 functions. */
302
303static char *get_static(char **buffer, size_t *buflen, int len)
304{
305 char *result;
306
307 /* Error check. We return false if things aren't set up right, or
308 there isn't enough buffer space left. */
309
310 if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
311 return NULL;
312 }
313
314 /* Return an index into the static buffer */
315
316 result = *buffer;
317 *buffer += len;
318 *buflen -= len;
319
320 return result;
321}
322
323/****************************************************************************
324gethostbyname() - we ignore any domain portion of the name and only
325handle names that are at most 15 characters long
326 **************************************************************************/
327NSS_STATUS
328_nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
329 char *buffer, size_t buflen, int *h_errnop)
330{
331 NSS_STATUS nss_status = NSS_STATUS_SUCCESS;
332 struct in_addr *ip_list;
333 int i, count;
334 fstring name;
335 size_t namelen;
336 TALLOC_CTX *frame;
337
338#if HAVE_PTHREAD
339 pthread_mutex_lock(&wins_nss_mutex);
340#endif
341
342 frame = talloc_stackframe();
343
344 memset(he, '\0', sizeof(*he));
345 fstrcpy(name, hostname);
346
347 /* Do lookup */
348
349 ip_list = lookup_byname_backend(name, &count);
350
351 if (!ip_list) {
352 nss_status = NSS_STATUS_NOTFOUND;
353 goto out;
354 }
355
356 /* Copy h_name */
357
358 namelen = strlen(name) + 1;
359
360 if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL) {
361 free(ip_list);
362 nss_status = NSS_STATUS_TRYAGAIN;
363 goto out;
364 }
365
366 memcpy(he->h_name, name, namelen);
367
368 /* Copy h_addr_list, align to pointer boundary first */
369
370 if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
371 i = sizeof(char*) - i;
372
373 if (get_static(&buffer, &buflen, i) == NULL) {
374 free(ip_list);
375 nss_status = NSS_STATUS_TRYAGAIN;
376 goto out;
377 }
378
379 if ((he->h_addr_list = (char **)get_static(
380 &buffer, &buflen, (count + 1) * sizeof(char *))) == NULL) {
381 free(ip_list);
382 nss_status = NSS_STATUS_TRYAGAIN;
383 goto out;
384 }
385
386 for (i = 0; i < count; i++) {
387 if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
388 INADDRSZ)) == NULL) {
389 free(ip_list);
390 nss_status = NSS_STATUS_TRYAGAIN;
391 goto out;
392 }
393 memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
394 }
395
396 he->h_addr_list[count] = NULL;
397
398 free(ip_list);
399
400 /* Set h_addr_type and h_length */
401
402 he->h_addrtype = AF_INET;
403 he->h_length = INADDRSZ;
404
405 /* Set h_aliases */
406
407 if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
408 i = sizeof(char*) - i;
409
410 if (get_static(&buffer, &buflen, i) == NULL) {
411 nss_status = NSS_STATUS_TRYAGAIN;
412 goto out;
413 }
414
415 if ((he->h_aliases = (char **)get_static(
416 &buffer, &buflen, sizeof(char *))) == NULL) {
417 nss_status = NSS_STATUS_TRYAGAIN;
418 goto out;
419 }
420
421 he->h_aliases[0] = NULL;
422
423 nss_status = NSS_STATUS_SUCCESS;
424
425 out:
426
427 TALLOC_FREE(frame);
428
429#if HAVE_PTHREAD
430 pthread_mutex_unlock(&wins_nss_mutex);
431#endif
432 return nss_status;
433}
434
435
436NSS_STATUS
437_nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
438 char *buffer, size_t buflen, int *h_errnop)
439{
440 NSS_STATUS nss_status;
441
442 if(af!=AF_INET) {
443 *h_errnop = NO_DATA;
444 nss_status = NSS_STATUS_UNAVAIL;
445 } else {
446 nss_status = _nss_wins_gethostbyname_r(
447 name, he, buffer, buflen, h_errnop);
448 }
449 return nss_status;
450}
451#endif
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