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