1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26/*
27 * User-space door client for LanMan share management.
28 */
29
30#include <syslog.h>
31#include <door.h>
32#include <fcntl.h>
33#include <stdarg.h>
34#include <errno.h>
35#include <string.h>
36#include <strings.h>
37#include <unistd.h>
38#include <thread.h>
39#include <synch.h>
40
41#include <smbsrv/libsmb.h>
42#include <smbsrv/smb_share.h>
43#include <smbsrv/smb.h>
44
45#define	SMB_SHARE_DOOR_CALL_RETRIES		3
46
47static int smb_share_dfd = -1;
48static uint64_t smb_share_dncall = 0;
49static mutex_t smb_share_dmtx;
50static cond_t smb_share_dcv;
51
52static int smb_share_door_clnt_open(void);
53static void smb_share_door_clnt_close(void);
54
55void
56smb_share_door_clnt_init(void)
57{
58	(void) mutex_lock(&smb_share_dmtx);
59	(void) smb_share_door_clnt_open();
60	(void) mutex_unlock(&smb_share_dmtx);
61}
62
63void
64smb_share_door_clnt_fini(void)
65{
66	(void) mutex_lock(&smb_share_dmtx);
67	smb_share_door_clnt_close();
68	(void) mutex_unlock(&smb_share_dmtx);
69}
70
71/*
72 * Open smb_share_door.  This is a private call for use by
73 * smb_share_door_clnt_enter() and must be called with smb_share_dmtx held.
74 *
75 * Returns the door fd on success.  Otherwise, -1.
76 */
77static int
78smb_share_door_clnt_open(void)
79{
80	if (smb_share_dfd == -1) {
81		if ((smb_share_dfd = open(SMB_SHARE_DNAME, O_RDONLY)) < 0)
82			smb_share_dfd = -1;
83		else
84			smb_share_dncall = 0;
85	}
86
87	return (smb_share_dfd);
88}
89
90/*
91 * Close smb_share_door.
92 * Private call that must be called with smb_share_dmtx held.
93 */
94static void
95smb_share_door_clnt_close(void)
96{
97	if (smb_share_dfd != -1) {
98		while (smb_share_dncall > 0)
99			(void) cond_wait(&smb_share_dcv, &smb_share_dmtx);
100
101		if (smb_share_dfd != -1) {
102			(void) close(smb_share_dfd);
103			smb_share_dfd = -1;
104		}
105	}
106}
107
108/*
109 * Entry handler for smb_share_door calls.
110 */
111static door_arg_t *
112smb_share_door_clnt_enter(void)
113{
114	door_arg_t *arg;
115	char *buf;
116
117	(void) mutex_lock(&smb_share_dmtx);
118
119	if (smb_share_door_clnt_open() == -1) {
120		(void) mutex_unlock(&smb_share_dmtx);
121		return (NULL);
122	}
123
124	if ((arg = malloc(sizeof (door_arg_t) + SMB_SHARE_DSIZE)) != NULL) {
125		buf = ((char *)arg) + sizeof (door_arg_t);
126		bzero(arg, sizeof (door_arg_t));
127		arg->data_ptr = buf;
128		arg->rbuf = buf;
129		arg->rsize = SMB_SHARE_DSIZE;
130
131		++smb_share_dncall;
132	}
133
134	(void) mutex_unlock(&smb_share_dmtx);
135	return (arg);
136}
137
138/*
139 * Exit handler for smb_share_door calls.
140 */
141static void
142smb_share_door_clnt_exit(door_arg_t *arg, boolean_t must_close, char *errmsg)
143{
144	if (errmsg)
145		syslog(LOG_DEBUG, "smb_share_door: %s failed", errmsg);
146
147	(void) mutex_lock(&smb_share_dmtx);
148	free(arg);
149	--smb_share_dncall;
150	(void) cond_signal(&smb_share_dcv);
151
152	if (must_close)
153		smb_share_door_clnt_close();
154
155	(void) mutex_unlock(&smb_share_dmtx);
156}
157
158static int
159smb_share_door_call(int fd, door_arg_t *arg)
160{
161	int rc;
162	int i;
163
164	for (i = 0; i < SMB_SHARE_DOOR_CALL_RETRIES; ++i) {
165		errno = 0;
166
167		if ((rc = door_call(fd, arg)) == 0)
168			break;
169
170		if (errno != EAGAIN && errno != EINTR)
171			break;
172	}
173
174	return (rc);
175}
176
177static int
178smb_share_dchk(smb_dr_ctx_t *dec_ctx)
179{
180	int status = smb_dr_get_int32(dec_ctx);
181
182	if (status != SMB_SHARE_DSUCCESS) {
183		if (status == SMB_SHARE_DERROR)
184			(void) smb_dr_get_uint32(dec_ctx);
185		return (-1);
186	}
187
188	return (0);
189}
190
191uint32_t
192smb_share_list(int offset, smb_shrlist_t *list)
193{
194	door_arg_t *arg;
195	smb_dr_ctx_t *dec_ctx;
196	smb_dr_ctx_t *enc_ctx;
197	uint32_t rc;
198
199	bzero(list, sizeof (smb_shrlist_t));
200
201	if ((arg = smb_share_door_clnt_enter()) == NULL)
202		return (NERR_InternalError);
203
204	enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
205	smb_dr_put_uint32(enc_ctx, SMB_SHROP_LIST);
206	smb_dr_put_int32(enc_ctx, offset);
207
208	rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
209	if (rc != 0) {
210		smb_share_door_clnt_exit(arg, B_FALSE, "encode");
211		return (NERR_InternalError);
212	}
213
214	if (smb_share_door_call(smb_share_dfd, arg) < 0) {
215		smb_share_door_clnt_exit(arg, B_TRUE, "door call");
216		return (NERR_InternalError);
217	}
218
219	dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
220	if (smb_share_dchk(dec_ctx) != 0) {
221		(void) smb_dr_decode_finish(dec_ctx);
222		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
223		return (NERR_InternalError);
224	}
225
226	(void) smb_dr_get_buf(dec_ctx, (unsigned char *)list,
227	    sizeof (smb_shrlist_t));
228	if (smb_dr_decode_finish(dec_ctx) != 0) {
229		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
230		return (NERR_InternalError);
231	}
232
233	smb_share_door_clnt_exit(arg, B_FALSE, NULL);
234	return (NERR_Success);
235}
236
237int
238smb_share_count(void)
239{
240	door_arg_t *arg;
241	smb_dr_ctx_t *dec_ctx;
242	smb_dr_ctx_t *enc_ctx;
243	uint32_t num_shares;
244	int rc;
245
246	if ((arg = smb_share_door_clnt_enter()) == NULL)
247		return (-1);
248
249	enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
250	smb_dr_put_uint32(enc_ctx, SMB_SHROP_NUM_SHARES);
251
252	rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
253	if (rc != 0) {
254		smb_share_door_clnt_exit(arg, B_FALSE, "encode");
255		return (-1);
256	}
257
258	if (smb_share_door_call(smb_share_dfd, arg) < 0) {
259		smb_share_door_clnt_exit(arg, B_TRUE, "door call");
260		return (-1);
261	}
262
263	dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
264	if (smb_share_dchk(dec_ctx) != 0) {
265		(void) smb_dr_decode_finish(dec_ctx);
266		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
267		return (-1);
268	}
269
270	num_shares = smb_dr_get_uint32(dec_ctx);
271	if (smb_dr_decode_finish(dec_ctx) != 0) {
272		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
273		return (-1);
274	}
275
276	smb_share_door_clnt_exit(arg, B_FALSE, NULL);
277	return (num_shares);
278}
279
280uint32_t
281smb_share_delete(char *share_name)
282{
283	door_arg_t *arg;
284	smb_dr_ctx_t *dec_ctx;
285	smb_dr_ctx_t *enc_ctx;
286	uint32_t rc;
287
288	if ((arg = smb_share_door_clnt_enter()) == NULL)
289		return (NERR_InternalError);
290
291	enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
292	smb_dr_put_uint32(enc_ctx, SMB_SHROP_DELETE);
293	smb_dr_put_string(enc_ctx, share_name);
294
295	rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
296	if (rc != 0) {
297		smb_share_door_clnt_exit(arg, B_FALSE, "encode");
298		return (NERR_InternalError);
299	}
300
301	if (smb_share_door_call(smb_share_dfd, arg) < 0) {
302		smb_share_door_clnt_exit(arg, B_TRUE, "door call");
303		return (NERR_InternalError);
304	}
305
306	dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
307	if (smb_share_dchk(dec_ctx) != 0) {
308		(void) smb_dr_decode_finish(dec_ctx);
309		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
310		return (NERR_InternalError);
311	}
312
313	rc = smb_dr_get_uint32(dec_ctx);
314	if (smb_dr_decode_finish(dec_ctx) != 0) {
315		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
316		return (NERR_InternalError);
317	}
318
319	smb_share_door_clnt_exit(arg, B_FALSE, NULL);
320	return (rc);
321
322}
323
324uint32_t
325smb_share_rename(char *from, char *to)
326{
327	door_arg_t *arg;
328	smb_dr_ctx_t *dec_ctx;
329	smb_dr_ctx_t *enc_ctx;
330	uint32_t rc;
331
332	if ((arg = smb_share_door_clnt_enter()) == NULL)
333		return (NERR_InternalError);
334
335	enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
336	smb_dr_put_uint32(enc_ctx, SMB_SHROP_RENAME);
337	smb_dr_put_string(enc_ctx, from);
338	smb_dr_put_string(enc_ctx, to);
339
340	rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
341	if (rc != 0) {
342		smb_share_door_clnt_exit(arg, B_FALSE, "encode");
343		return (NERR_InternalError);
344	}
345
346	if (smb_share_door_call(smb_share_dfd, arg) < 0) {
347		smb_share_door_clnt_exit(arg, B_TRUE, "door call");
348		return (NERR_InternalError);
349	}
350
351	dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
352	if (smb_share_dchk(dec_ctx) != 0) {
353		(void) smb_dr_decode_finish(dec_ctx);
354		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
355		return (NERR_InternalError);
356	}
357
358	rc = smb_dr_get_uint32(dec_ctx);
359	if (smb_dr_decode_finish(dec_ctx) != 0) {
360		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
361		return (NERR_InternalError);
362	}
363
364	smb_share_door_clnt_exit(arg, B_FALSE, NULL);
365	return (rc);
366}
367
368uint32_t
369smb_share_create(smb_share_t *si)
370{
371	door_arg_t *arg;
372	smb_dr_ctx_t *dec_ctx;
373	smb_dr_ctx_t *enc_ctx;
374	uint32_t rc;
375
376	if ((arg = smb_share_door_clnt_enter()) == NULL)
377		return (NERR_InternalError);
378
379	enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
380	smb_dr_put_uint32(enc_ctx, SMB_SHROP_ADD);
381	smb_dr_put_share(enc_ctx, si);
382
383	rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
384	if (rc != 0) {
385		smb_share_door_clnt_exit(arg, B_FALSE, "encode");
386		return (NERR_InternalError);
387	}
388
389	if (smb_share_door_call(smb_share_dfd, arg) < 0) {
390		smb_share_door_clnt_exit(arg, B_TRUE, "door call");
391		return (NERR_InternalError);
392	}
393
394	dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
395	if (smb_share_dchk(dec_ctx) != 0) {
396		(void) smb_dr_decode_finish(dec_ctx);
397		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
398		return (NERR_InternalError);
399	}
400
401	rc = smb_dr_get_uint32(dec_ctx);
402	smb_dr_get_share(dec_ctx, si);
403	if (smb_dr_decode_finish(dec_ctx) != 0) {
404		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
405		return (NERR_InternalError);
406	}
407
408	smb_share_door_clnt_exit(arg, B_FALSE, NULL);
409	return (rc);
410}
411
412uint32_t
413smb_share_modify(smb_share_t *si)
414{
415	door_arg_t *arg;
416	smb_dr_ctx_t *dec_ctx;
417	smb_dr_ctx_t *enc_ctx;
418	uint32_t rc;
419
420	if ((arg = smb_share_door_clnt_enter()) == NULL)
421		return (NERR_InternalError);
422
423	enc_ctx = smb_dr_encode_start(arg->data_ptr, SMB_SHARE_DSIZE);
424	smb_dr_put_uint32(enc_ctx, SMB_SHROP_MODIFY);
425	smb_dr_put_share(enc_ctx, si);
426
427	rc = smb_dr_encode_finish(enc_ctx, (unsigned int *)&arg->data_size);
428	if (rc != 0) {
429		smb_share_door_clnt_exit(arg, B_FALSE, "encode");
430		return (NERR_InternalError);
431	}
432
433	if (smb_share_door_call(smb_share_dfd, arg) < 0) {
434		smb_share_door_clnt_exit(arg, B_TRUE, "door call");
435		return (NERR_InternalError);
436	}
437
438	dec_ctx = smb_dr_decode_start(arg->data_ptr, arg->data_size);
439	if (smb_share_dchk(dec_ctx) != 0) {
440		(void) smb_dr_decode_finish(dec_ctx);
441		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
442		return (NERR_InternalError);
443	}
444
445	rc = smb_dr_get_uint32(dec_ctx);
446	if (smb_dr_decode_finish(dec_ctx) != 0) {
447		smb_share_door_clnt_exit(arg, B_FALSE, "decode");
448		return (NERR_InternalError);
449	}
450
451	smb_share_door_clnt_exit(arg, B_FALSE, NULL);
452	return (rc);
453}
454