usr.sbin/extattrctl/extattrctl.c

   1 /*-
   2  * Copyright (c) 1999-2002 Robert N. M. Watson
   3  * All rights reserved.
   4  *
   5  * This software was developed by Robert Watson for the TrustedBSD Project.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD$
  29  */
  30 /*
  31  * Developed by the TrustedBSD Project.
  32  * Support for file system extended attribute.
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/uio.h>
  37 #include <sys/extattr.h>
  38 #include <sys/param.h>
  39 #include <sys/mount.h>
  40
  41 #include <ufs/ufs/extattr.h>
  42
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <libutil.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50
  51 int initattr(int argc, char *argv[]);
  52 int showattr(int argc, char *argv[]);
  53 long num_inodes_by_path(char *path);
  54 void usage(void);
  55
  56 void
  57 usage()
  58 {
  59
  60         fprintf(stderr,
  61             "usage:\n"
  62             "  extattrctl start path\n"
  63             "  extattrctl stop path\n"
  64             "  extattrctl initattr [-f] [-p path] attrsize attrfile\n"
  65             "  extattrctl showattr attrfile\n"
  66             "  extattrctl enable path attrnamespace attrname attrfile\n"
  67             "  extattrctl disable path attrnamespace attrname\n");
  68         exit(-1);
  69 }
  70
  71 long
  72 num_inodes_by_path(char *path)
  73 {
  74         struct statfs   buf;
  75         int     error;
  76
  77         error = statfs(path, &buf);
  78         if (error) {
  79                 perror("statfs");
  80                 return (-1);
  81         }
  82
  83         return (buf.f_files);
  84 }
  85
  86 static const char zero_buf[8192];
  87
  88 int
  89 initattr(int argc, char *argv[])
  90 {
  91         struct ufs_extattr_fileheader   uef;
  92         char    *fs_path = NULL;
  93         int     ch, i, error, flags;
  94         ssize_t wlen;
  95         size_t  easize;
  96
  97         flags = O_CREAT | O_WRONLY | O_TRUNC | O_EXCL;
  98         optind = 0;
  99         while ((ch = getopt(argc, argv, "fp:r:w:")) != -1)
 100                 switch (ch) {
 101                 case 'f':
 102                         flags &= ~O_EXCL;
 103                         break;
 104                 case 'p':
 105                         fs_path = optarg;
 106                         break;
 107                 case '?':
 108                 default:
 109                         usage();
 110                 }
 111
 112         argc -= optind;
 113         argv += optind;
 114
 115         if (argc != 2)
 116                 usage();
 117
 118         error = 0;
 119         if ((i = open(argv[1], flags, 0600)) == -1) {
 120                 /* unable to open file */
 121                 perror(argv[1]);
 122                 return (-1);
 123         }
 124         uef.uef_magic = UFS_EXTATTR_MAGIC;
 125         uef.uef_version = UFS_EXTATTR_VERSION;
 126         uef.uef_size = atoi(argv[0]);
 127         if (write(i, &uef, sizeof(uef)) == -1)
 128                 error = -1;
 129         else if (fs_path != NULL) {
 130                 easize = (sizeof uef + uef.uef_size) *
 131                     num_inodes_by_path(fs_path);
 132                 while (easize > 0) {
 133                         if (easize > sizeof zero_buf)
 134                                 wlen = write(i, zero_buf, sizeof zero_buf);
 135                         else
 136                                 wlen = write(i, zero_buf, easize);
 137                         if (wlen == -1) {
 138                                 error = -1;
 139                                 break;
 140                         }
 141                         easize -= wlen;
 142                 }
 143         }
 144         if (error == -1) {
 145                 perror(argv[1]);
 146                 unlink(argv[1]);
 147                 return (-1);
 148         }
 149
 150         return (0);
 151 }
 152
 153 int
 154 showattr(int argc, char *argv[])
 155 {
 156         struct ufs_extattr_fileheader   uef;
 157         int i, fd;
 158
 159         if (argc != 1)
 160                 usage();
 161
 162         fd = open(argv[0], O_RDONLY);
 163         if (fd == -1) {
 164                 perror(argv[0]);
 165                 return (-1);
 166         }
 167
 168         i = read(fd, &uef, sizeof(uef));
 169         if (i == -1) {
 170                 perror(argv[0]);
 171                 return (-1);
 172         }
 173         if (i != sizeof(uef)) {
 174                 fprintf(stderr, "%s: invalid file header\n", argv[0]);
 175                 return (-1);
 176         }
 177
 178         if (uef.uef_magic != UFS_EXTATTR_MAGIC) {
 179                 fprintf(stderr, "%s: bad magic\n", argv[0]);
 180                 return (-1);
 181         }
 182
 183         printf("%s: version %d, size %d\n", argv[0], uef.uef_version,
 184             uef.uef_size);
 185
 186         return (0);
 187 }
 188
 189 int
 190 main(int argc, char *argv[])
 191 {
 192         int     error = 0, attrnamespace;
 193
 194         if (argc < 2)
 195                 usage();
 196
 197         if (!strcmp(argv[1], "start")) {
 198                 if (argc != 3)
 199                         usage();
 200                 error = extattrctl(argv[2], UFS_EXTATTR_CMD_START, NULL, 0,
 201                     NULL);
 202                 if (error) {
 203                         perror("extattrctl start");
 204                         return (-1);
 205                 }
 206         } else if (!strcmp(argv[1], "stop")) {
 207                 if (argc != 3)
 208                         usage();
 209                 error = extattrctl(argv[2], UFS_EXTATTR_CMD_STOP, NULL, 0,
 210                    NULL);
 211                 if (error) {
 212                         perror("extattrctl stop");
 213                         return (-1);
 214                 }
 215         } else if (!strcmp(argv[1], "enable")) {
 216                 if (argc != 6)
 217                         usage();
 218                 error = extattr_string_to_namespace(argv[3], &attrnamespace);
 219                 if (error) {
 220                         perror("extattrctl enable");
 221                         return (-1);
 222                 }
 223                 error = extattrctl(argv[2], UFS_EXTATTR_CMD_ENABLE, argv[5],
 224                     attrnamespace, argv[4]);
 225                 if (error) {
 226                         perror("extattrctl enable");
 227                         return (-1);
 228                 }
 229         } else if (!strcmp(argv[1], "disable")) {
 230                 if (argc != 5)
 231                         usage();
 232                 error = extattr_string_to_namespace(argv[3], &attrnamespace);
 233                 if (error) {
 234                         perror("extattrctl disable");
 235                         return (-1);
 236                 }
 237                 error = extattrctl(argv[2], UFS_EXTATTR_CMD_DISABLE, NULL,
 238                     attrnamespace, argv[4]);
 239                 if (error) {
 240                         perror("extattrctl disable");
 241                         return (-1);
 242                 }
 243         } else if (!strcmp(argv[1], "initattr")) {
 244                 argc -= 2;
 245                 argv += 2;
 246                 error = initattr(argc, argv);
 247                 if (error)
 248                         return (-1);
 249         } else if (!strcmp(argv[1], "showattr")) {
 250                 argc -= 2;
 251                 argv += 2;
 252                 error = showattr(argc, argv);
 253                 if (error)
 254                         return (-1);
 255         } else
 256                 usage();
 257
 258         return (0);
 259 }