1 /*
2 * Copyright (c) 1990 Jan-Simon Pendry
3 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Jan-Simon Pendry at Imperial College, London.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from: @(#)info_union.c 8.1 (Berkeley) 6/6/93
35 * $Id: info_union.c,v 1.9 2014/10/26 03:03:34 guenther Exp $
36 */
37
38 /*
39 * Get info from the system namespace
40 *
41 * NOTE: Cannot handle reads back through the automounter.
42 * THIS WILL CAUSE A DEADLOCK!
43 */
44
45 #include "am.h"
46
47
48 #include <dirent.h>
49 #define DIRENT struct dirent
50
51 #define UNION_PREFIX "union:"
52 #define UNION_PREFLEN 6
53
54 /*
55 * No way to probe - check the map name begins with "union:"
56 */
57 int
union_init(char * map,time_t * tp)58 union_init(char *map, time_t *tp)
59 {
60 *tp = 0;
61 return strncmp(map, UNION_PREFIX, UNION_PREFLEN) == 0 ? 0 : ENOENT;
62 }
63
64 int
union_search(mnt_map * m,char * map,char * key,char ** pval,time_t * tp)65 union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
66 {
67 char *mapd = strdup(map + UNION_PREFLEN);
68 char **v = strsplit(mapd, ':', '\"');
69 char **p;
70
71 for (p = v; p[1]; p++)
72 ;
73 *pval = xmalloc(strlen(*p) + 5);
74 snprintf(*pval, strlen(*p) + 5, "fs:=%s", *p);
75 free(mapd);
76 free(v);
77 return 0;
78 }
79
80 int
union_reload(mnt_map * m,char * map,void (* fn)(mnt_map *,char *,char *))81 union_reload(mnt_map *m, char *map, void (*fn)(mnt_map *, char *, char *))
82 {
83 char *mapd = strdup(map + UNION_PREFLEN);
84 char **v = strsplit(mapd, ':', '\"');
85 char **dir;
86
87 /*
88 * Add fake /defaults entry
89 */
90 (*fn)(m, strdup("/defaults"),
91 strdup("type:=link;opts:=nounmount;sublink:=${key}"));
92
93 for (dir = v; *dir; dir++) {
94 DIR *dirp = opendir(*dir);
95 DIRENT *dp;
96 int dlen;
97
98 if (!dirp) {
99 plog(XLOG_USER, "Cannot read directory %s: %m", *dir);
100 continue;
101 }
102 dlen = strlen(*dir);
103 #ifdef DEBUG
104 dlog("Reading directory %s...", *dir);
105 #endif
106 while ((dp = readdir(dirp))) {
107 char *val;
108
109 if (dp->d_name[0] == '.' &&
110 (dp->d_name[1] == '\0' ||
111 (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
112 continue;
113
114 #ifdef DEBUG
115 dlog("... gives %s", dp->d_name);
116 #endif
117 val = xmalloc(dlen + 5);
118 snprintf(val, dlen + 5, "fs:=%s", *dir);
119 (*fn)(m, strdup(dp->d_name), val);
120 }
121 closedir(dirp);
122 }
123
124 /*
125 * Add wildcard entry
126 */
127 {
128 char *val = xmalloc(strlen(dir[-1]) + 5);
129
130 snprintf(val, strlen(dir[-1]) + 5, "fs:=%s", dir[-1]);
131 (*fn)(m, strdup("*"), val);
132 }
133 free(mapd);
134 free(v);
135 return 0;
136 }
137
138