1 /* $NetBSD: info_union.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997-2014 Erez Zadok
5 * Copyright (c) 1990 Jan-Simon Pendry
6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1990 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Jan-Simon Pendry at Imperial College, London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *
38 * File: am-utils/amd/info_union.c
39 *
40 */
41
42 /*
43 * Get info from the system namespace
44 *
45 * NOTE: Cannot handle reads back through the automounter.
46 * THIS WILL CAUSE A DEADLOCK!
47 */
48
49 #ifdef HAVE_CONFIG_H
50 # include <config.h>
51 #endif /* HAVE_CONFIG_H */
52 #include <am_defs.h>
53 #include <amd.h>
54
55 #define UNION_PREFIX "union:"
56 #define UNION_PREFLEN 6
57
58 /* forward declarations */
59 int union_init(mnt_map *m, char *map, time_t *tp);
60 int union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp);
61 int union_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *));
62
63
64 /*
65 * No way to probe - check the map name begins with "union:"
66 */
67 int
union_init(mnt_map * m,char * map,time_t * tp)68 union_init(mnt_map *m, char *map, time_t *tp)
69 {
70 *tp = 0;
71 return NSTREQ(map, UNION_PREFIX, UNION_PREFLEN) ? 0 : ENOENT;
72 }
73
74
75 int
union_search(mnt_map * m,char * map,char * key,char ** pval,time_t * tp)76 union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
77 {
78 char *mapd = xstrdup(map + UNION_PREFLEN);
79 char **v = strsplit(mapd, ':', '\"');
80 char **p;
81 size_t l;
82
83 for (p = v; p[1]; p++) ;
84 l = strlen(*p) + 5;
85 *pval = xmalloc(l);
86 xsnprintf(*pval, l, "fs:=%s", *p);
87 XFREE(mapd);
88 XFREE(v);
89 return 0;
90 }
91
92
93 int
union_reload(mnt_map * m,char * map,void (* fn)(mnt_map *,char *,char *))94 union_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *))
95 {
96 static const char fseq[] = "fs:=";
97 char *mapd = xstrdup(map + UNION_PREFLEN);
98 char **v = strsplit(mapd, ':', '\"');
99 char **dir;
100
101 /*
102 * Add fake /defaults entry
103 */
104 (*fn) (m, xstrdup("/defaults"), xstrdup("type:=link;opts:=nounmount;sublink:=${key}"));
105
106 for (dir = v; *dir; dir++) {
107 size_t l;
108 struct dirent *dp;
109
110 DIR *dirp = opendir(*dir);
111 if (!dirp) {
112 plog(XLOG_USER, "Cannot read directory %s: %m", *dir);
113 continue;
114 }
115 l = strlen(*dir) + sizeof(fseq);
116
117 dlog("Reading directory %s...", *dir);
118 while ((dp = readdir(dirp))) {
119 char *val, *dpname = &dp->d_name[0];
120 if (dpname[0] == '.' &&
121 (dpname[1] == '\0' ||
122 (dpname[1] == '.' && dpname[2] == '\0')))
123 continue;
124
125 dlog("... gives %s", dp->d_name);
126 val = xmalloc(l);
127 xsnprintf(val, l, "%s%s", fseq, *dir);
128 (*fn) (m, xstrdup(dp->d_name), val);
129 }
130 closedir(dirp);
131 }
132
133 /*
134 * Add wildcard entry
135 */
136 {
137 size_t l = strlen(*(dir-1)) + sizeof(fseq);
138 char *val = xmalloc(l);
139
140 xsnprintf(val, l, "%s%s", fseq, *(dir-1));
141 (*fn) (m, xstrdup("*"), val);
142 }
143 XFREE(mapd);
144 XFREE(v);
145 return 0;
146 }
147