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 *	autod_lookup.c
23 *
24 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28#pragma ident	"%Z%%M%	%I%	%E% SMI"
29
30#include <stdio.h>
31#include <ctype.h>
32#include <string.h>
33#include <syslog.h>
34#include <errno.h>
35#include <locale.h>
36#include <stdlib.h>
37#include <unistd.h>
38#include <assert.h>
39#include "automount.h"
40
41int
42do_lookup1(
43	char *mapname,
44	char *key,
45	char *subdir,
46	char *mapopts,
47	char *path,
48	uint_t isdirect,
49	uid_t uid,
50	autofs_action_t *action,
51	struct linka *linkp)
52{
53	struct mapline ml;
54	struct mapent *mapents = NULL;
55	int err;
56	struct autofs_rddir_cache *rdcp;
57	int found = 0;
58	bool_t iswildcard = FALSE;
59	bool_t isrestricted = hasrestrictopt(mapopts);
60	char *stack[STACKSIZ];
61	char **stkptr = stack;
62
63	/*
64	 * Default action is for no work to be done by kernel AUTOFS.
65	 */
66	*action = AUTOFS_NONE;
67
68	/*
69	 * Is there a cache for this map?
70	 */
71	rw_rdlock(&autofs_rddir_cache_lock);
72	err = autofs_rddir_cache_lookup(mapname, &rdcp);
73	if (!err && rdcp->full) {
74		rw_unlock(&autofs_rddir_cache_lock);
75		/*
76		 * Try to lock readdir cache entry for reading, if
77		 * the entry can not be locked, then avoid blocking
78		 * and go to the name service. I'm assuming it is
79		 * faster to go to the name service than to wait for
80		 * the cache to be populated.
81		 */
82		if (rw_tryrdlock(&rdcp->rwlock) == 0) {
83			found = (rddir_entry_lookup(key, rdcp->entp) != NULL);
84			rw_unlock(&rdcp->rwlock);
85		}
86	} else
87		rw_unlock(&autofs_rddir_cache_lock);
88
89	if (!err) {
90		/*
91		 * release reference on cache entry
92		 */
93		mutex_lock(&rdcp->lock);
94		rdcp->in_use--;
95		assert(rdcp->in_use >= 0);
96		mutex_unlock(&rdcp->lock);
97	}
98
99	if (found)
100		return (0);
101
102	/*
103	 * entry not found in cache, try the name service now
104	 */
105	err = 0;
106
107	/* initialize the stack of open files for this thread */
108	stack_op(INIT, NULL, stack, &stkptr);
109
110	err = getmapent(key, mapname, &ml, stack, &stkptr, &iswildcard,
111		isrestricted);
112	if (err == 0) /* call parser w default mount_access = TRUE */
113		mapents = parse_entry(key, mapname, mapopts, &ml,
114				    subdir, isdirect, TRUE);
115
116	/*
117	 * Now we indulge in a bit of hanky-panky.
118	 * If the entry isn't found in the map and the
119	 * name begins with an "=" then we assume that
120	 * the name is an undocumented control message
121	 * for the daemon.  This is accessible only
122	 * to superusers.
123	 */
124	if (mapents == NULL && *action == AUTOFS_NONE) {
125		if (*key == '=' && uid == 0) {
126			if (isdigit(*(key+1))) {
127				/*
128				 * If next character is a digit
129				 * then set the trace level.
130				 */
131				trace = atoi(key+1);
132				trace_prt(1, "Automountd: trace level = %d\n",
133					trace);
134			} else if (*(key+1) == 'v') {
135				/*
136				 * If it's a "v" then
137				 * toggle verbose mode.
138				 */
139				verbose = !verbose;
140				trace_prt(1, "Automountd: verbose %s\n",
141						verbose ? "on" : "off");
142			}
143		}
144
145		err = ENOENT;
146		goto done;
147	}
148
149	/*
150	 * Each mapent in the list describes a mount to be done.
151	 * Since I'm only doing a lookup, I only care whether a mapentry
152	 * was found or not. The mount will be done on a later RPC to
153	 * do_mount1.
154	 */
155	if (mapents == NULL && *action == AUTOFS_NONE)
156		err = ENOENT;
157
158done:	if (mapents)
159		free_mapent(mapents);
160
161	if (*action == AUTOFS_NONE && (iswildcard == TRUE)) {
162		*action = AUTOFS_MOUNT_RQ;
163	}
164	if (trace > 1) {
165		trace_prt(1, "  do_lookup1: action=%d wildcard=%s error=%d\n",
166			*action, iswildcard ? "TRUE" : "FALSE", err);
167	}
168	return (err);
169}
170