source: branches/samba-3.3.x/source/nsswitch/wins.c

Last change on this file was 206, checked in by Herwig Bauernfeind, 16 years ago

Import Samba 3.3 branch at 3.0.0 level (psmedley's port)
File size: 9.7 KB
RevLine 
[206]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#undef VOLATILE
24
25#include <ns_daemon.h>
26#endif
27
28#if HAVE_PTHREAD_H
29#include <pthread.h>
30#endif
31
32#if HAVE_PTHREAD
33static pthread_mutex_t wins_nss_mutex = PTHREAD_MUTEX_INITIALIZER;
34#endif
35
36#ifndef INADDRSZ
37#define INADDRSZ 4
38#endif
39
40static int initialised;
41
42extern bool AllowDebugChange;
43
44NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
45 char *buffer, size_t buflen, int *h_errnop);
46NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
47 char *buffer, size_t buflen, int *h_errnop);
48
49/* Use our own create socket code so we don't recurse.... */
50
51static int wins_lookup_open_socket_in(void)
52{
53 struct sockaddr_in sock;
54 int val=1;
55 int res;
56
57 memset((char *)&sock,'\0',sizeof(sock));
58
59#ifdef HAVE_SOCK_SIN_LEN
60 sock.sin_len = sizeof(sock);
61#endif
62 sock.sin_port = 0;
63 sock.sin_family = AF_INET;
64 sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
65 res = socket(AF_INET, SOCK_DGRAM, 0);
66 if (res == -1)
67 return -1;
68
69 if (setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val)) != 0) {
70 close(res);
71 return -1;
72 }
73#ifdef SO_REUSEPORT
74 if (setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val)) != 0) {
75 close(res);
76 return -1;
77 }
78#endif /* SO_REUSEPORT */
79
80 /* now we've got a socket - we need to bind it */
81
82 if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0) {
83 close(res);
84 return(-1);
85 }
86
87 set_socket_options(res,"SO_BROADCAST");
88
89 return res;
90}
91
92
93static void nss_wins_init(void)
94{
95 initialised = 1;
96 DEBUGLEVEL = 0;
97 AllowDebugChange = False;
98
99 TimeInit();
100 setup_logging("nss_wins",False);
101 load_case_tables();
102 lp_load(get_dyn_CONFIGFILE(),True,False,False,True);
103 load_interfaces();
104}
105
106static struct in_addr *lookup_byname_backend(const char *name, int *count)
107{
108 int fd = -1;
109 struct ip_service *address = NULL;
110 struct in_addr *ret = NULL;
111 int j, flags = 0;
112
113 if (!initialised) {
114 nss_wins_init();
115 }
116
117 *count = 0;
118
119 /* always try with wins first */
120 if (NT_STATUS_IS_OK(resolve_wins(name,0x00,&address,count))) {
121 if ( (ret = SMB_MALLOC_P(struct in_addr)) == NULL ) {
122 free( address );
123 return NULL;
124 }
125 if (address[0].ss.ss_family != AF_INET) {
126 free(address);
127 free(ret);
128 return NULL;
129 }
130 *ret = ((struct sockaddr_in *)&address[0].ss)->sin_addr;
131 free( address );
132 return ret;
133 }
134
135 fd = wins_lookup_open_socket_in();
136 if (fd == -1) {
137 return NULL;
138 }
139
140 /* uggh, we have to broadcast to each interface in turn */
141 for (j=iface_count() - 1;j >= 0;j--) {
142 const struct in_addr *bcast = iface_n_bcast_v4(j);
143 struct sockaddr_storage ss;
144 struct sockaddr_storage *pss;
145 if (!bcast) {
146 continue;
147 }
148 in_addr_to_sockaddr_storage(&ss, *bcast);
149 pss = name_query(fd,name,0x00,True,True,&ss,count, &flags, NULL);
150 if (pss) {
151 if ((ret = SMB_MALLOC_P(struct in_addr)) == NULL) {
152 return NULL;
153 }
154 *ret = ((struct sockaddr_in *)pss)->sin_addr;
155 break;
156 }
157 }
158
159 close(fd);
160 return ret;
161}
162
163#ifdef HAVE_NS_API_H
164
165static NODE_STATUS_STRUCT *lookup_byaddr_backend(char *addr, int *count)
166{
167 int fd;
168 struct sockaddr_storage ss;
169 struct nmb_name nname;
170 NODE_STATUS_STRUCT *status;
171
172 if (!initialised) {
173 nss_wins_init();
174 }
175
176 fd = wins_lookup_open_socket_in();
177 if (fd == -1)
178 return NULL;
179
180 make_nmb_name(&nname, "*", 0);
181 if (!interpret_string_addr(&ss, addr, AI_NUMERICHOST)) {
182 return NULL;
183 }
184 status = node_status_query(fd, &nname, &ss, count, NULL);
185
186 close(fd);
187 return status;
188}
189
190/* IRIX version */
191
192int init(void)
193{
194 nsd_logprintf(NSD_LOG_MIN, "entering init (wins)\n");
195 nss_wins_init();
196 return NSD_OK;
197}
198
199int lookup(nsd_file_t *rq)
200{
201 char *map;
202 char *key;
203 char *addr;
204 struct in_addr *ip_list;
205 NODE_STATUS_STRUCT *status;
206 int i, count, len, size;
207 char response[1024];
208 bool found = False;
209
210 nsd_logprintf(NSD_LOG_MIN, "entering lookup (wins)\n");
211 if (! rq)
212 return NSD_ERROR;
213
214 map = nsd_attr_fetch_string(rq->f_attrs, "table", (char*)0);
215 if (! map) {
216 rq->f_status = NS_FATAL;
217 return NSD_ERROR;
218 }
219
220 key = nsd_attr_fetch_string(rq->f_attrs, "key", (char*)0);
221 if (! key || ! *key) {
222 rq->f_status = NS_FATAL;
223 return NSD_ERROR;
224 }
225
226 response[0] = '\0';
227 len = sizeof(response) - 2;
228
229 /*
230 * response needs to be a string of the following format
231 * ip_address[ ip_address]*\tname[ alias]*
232 */
233 if (StrCaseCmp(map,"hosts.byaddr") == 0) {
234 if ( status = lookup_byaddr_backend(key, &count)) {
235 size = strlen(key) + 1;
236 if (size > len) {
237 free(status);
238 return NSD_ERROR;
239 }
240 len -= size;
241 strncat(response,key,size);
242 strncat(response,"\t",1);
243 for (i = 0; i < count; i++) {
244 /* ignore group names */
245 if (status[i].flags & 0x80) continue;
246 if (status[i].type == 0x20) {
247 size = sizeof(status[i].name) + 1;
248 if (size > len) {
249 free(status);
250 return NSD_ERROR;
251 }
252 len -= size;
253 strncat(response, status[i].name, size);
254 strncat(response, " ", 1);
255 found = True;
256 }
257 }
258 response[strlen(response)-1] = '\n';
259 free(status);
260 }
261 } else if (StrCaseCmp(map,"hosts.byname") == 0) {
262 if (ip_list = lookup_byname_backend(key, &count)) {
263 for (i = count; i ; i--) {
264 addr = inet_ntoa(ip_list[i-1]);
265 size = strlen(addr) + 1;
266 if (size > len) {
267 free(ip_list);
268 return NSD_ERROR;
269 }
270 len -= size;
271 if (i != 0)
272 response[strlen(response)-1] = ' ';
273 strncat(response,addr,size);
274 strncat(response,"\t",1);
275 }
276 size = strlen(key) + 1;
277 if (size > len) {
278 free(ip_list);
279 return NSD_ERROR;
280 }
281 strncat(response,key,size);
282 strncat(response,"\n",1);
283 found = True;
284 free(ip_list);
285 }
286 }
287
288 if (found) {
289 nsd_logprintf(NSD_LOG_LOW, "lookup (wins %s) %s\n",map,response);
290 nsd_set_result(rq,NS_SUCCESS,response,strlen(response),VOLATILE);
291 return NSD_OK;
292 }
293 nsd_logprintf(NSD_LOG_LOW, "lookup (wins) not found\n");
294 rq->f_status = NS_NOTFOUND;
295 return NSD_NEXT;
296}
297
298#else
299
300/* Allocate some space from the nss static buffer. The buffer and buflen
301 are the pointers passed in by the C library to the _nss_*_*
302 functions. */
303
304static char *get_static(char **buffer, size_t *buflen, int len)
305{
306 char *result;
307
308 /* Error check. We return false if things aren't set up right, or
309 there isn't enough buffer space left. */
310
311 if ((buffer == NULL) || (buflen == NULL) || (*buflen < len)) {
312 return NULL;
313 }
314
315 /* Return an index into the static buffer */
316
317 result = *buffer;
318 *buffer += len;
319 *buflen -= len;
320
321 return result;
322}
323
324/****************************************************************************
325gethostbyname() - we ignore any domain portion of the name and only
326handle names that are at most 15 characters long
327 **************************************************************************/
328NSS_STATUS
329_nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
330 char *buffer, size_t buflen, int *h_errnop)
331{
332 NSS_STATUS nss_status = NSS_STATUS_SUCCESS;
333 struct in_addr *ip_list;
334 int i, count;
335 fstring name;
336 size_t namelen;
337
338#if HAVE_PTHREAD
339 pthread_mutex_lock(&wins_nss_mutex);
340#endif
341
342 memset(he, '\0', sizeof(*he));
343 fstrcpy(name, hostname);
344
345 /* Do lookup */
346
347 ip_list = lookup_byname_backend(name, &count);
348
349 if (!ip_list) {
350 nss_status = NSS_STATUS_NOTFOUND;
351 goto out;
352 }
353
354 /* Copy h_name */
355
356 namelen = strlen(name) + 1;
357
358 if ((he->h_name = get_static(&buffer, &buflen, namelen)) == NULL) {
359 free(ip_list);
360 nss_status = NSS_STATUS_TRYAGAIN;
361 goto out;
362 }
363
364 memcpy(he->h_name, name, namelen);
365
366 /* Copy h_addr_list, align to pointer boundary first */
367
368 if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
369 i = sizeof(char*) - i;
370
371 if (get_static(&buffer, &buflen, i) == NULL) {
372 free(ip_list);
373 nss_status = NSS_STATUS_TRYAGAIN;
374 goto out;
375 }
376
377 if ((he->h_addr_list = (char **)get_static(
378 &buffer, &buflen, (count + 1) * sizeof(char *))) == NULL) {
379 free(ip_list);
380 nss_status = NSS_STATUS_TRYAGAIN;
381 goto out;
382 }
383
384 for (i = 0; i < count; i++) {
385 if ((he->h_addr_list[i] = get_static(&buffer, &buflen,
386 INADDRSZ)) == NULL) {
387 free(ip_list);
388 nss_status = NSS_STATUS_TRYAGAIN;
389 goto out;
390 }
391 memcpy(he->h_addr_list[i], &ip_list[i], INADDRSZ);
392 }
393
394 he->h_addr_list[count] = NULL;
395
396 free(ip_list);
397
398 /* Set h_addr_type and h_length */
399
400 he->h_addrtype = AF_INET;
401 he->h_length = INADDRSZ;
402
403 /* Set h_aliases */
404
405 if ((i = (unsigned long)(buffer) % sizeof(char*)) != 0)
406 i = sizeof(char*) - i;
407
408 if (get_static(&buffer, &buflen, i) == NULL) {
409 nss_status = NSS_STATUS_TRYAGAIN;
410 goto out;
411 }
412
413 if ((he->h_aliases = (char **)get_static(
414 &buffer, &buflen, sizeof(char *))) == NULL) {
415 nss_status = NSS_STATUS_TRYAGAIN;
416 goto out;
417 }
418
419 he->h_aliases[0] = NULL;
420
421 nss_status = NSS_STATUS_SUCCESS;
422
423 out:
424
425#if HAVE_PTHREAD
426 pthread_mutex_unlock(&wins_nss_mutex);
427#endif
428 return nss_status;
429}
430
431
432NSS_STATUS
433_nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
434 char *buffer, size_t buflen, int *h_errnop)
435{
436 NSS_STATUS nss_status;
437
438 if(af!=AF_INET) {
439 *h_errnop = NO_DATA;
440 nss_status = NSS_STATUS_UNAVAIL;
441 } else {
442 nss_status = _nss_wins_gethostbyname_r(
443 name, he, buffer, buflen, h_errnop);
444 }
445 return nss_status;
446}
447#endif
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