debugfs/xattrs.c

   1 /*
   2  * xattrs.c --- Modify extended attributes via debugfs.
   3  *
   4  * Copyright (C) 2014 Oracle.  This file may be redistributed
   5  * under the terms of the GNU Public License.
   6  */
   7
   8 #include "config.h"
   9 #include <stdio.h>
  10 #ifdef HAVE_GETOPT_H
  11 #include <getopt.h>
  12 #else
  13 extern int optind;
  14 extern char *optarg;
  15 #endif
  16 #include <ctype.h>
  17
  18 #include "debugfs.h"
  19
  20 /* Dump extended attributes */
  21 static void dump_xattr_string(FILE *out, const char *str, int len)
  22 {
  23         int printable = 0;
  24         int i;
  25
  26         /* check: is string "printable enough?" */
  27         for (i = 0; i < len; i++)
  28                 if (isprint(str[i]))
  29                         printable++;
  30
  31         if (printable <= len*7/8)
  32                 printable = 0;
  33
  34         for (i = 0; i < len; i++)
  35                 if (printable)
  36                         fprintf(out, isprint(str[i]) ? "%c" : "\\%03o",
  37                                 (unsigned char)str[i]);
  38                 else
  39                         fprintf(out, "%02x ", (unsigned char)str[i]);
  40 }
  41
  42 static int dump_attr(char *name, char *value, size_t value_len, void *data)
  43 {
  44         FILE *out = data;
  45
  46         fprintf(out, "  ");
  47         dump_xattr_string(out, name, strlen(name));
  48         fprintf(out, " = \"");
  49         dump_xattr_string(out, value, value_len);
  50         fprintf(out, "\" (%zu)\n", value_len);
  51
  52         return 0;
  53 }
  54
  55 void dump_inode_attributes(FILE *out, ext2_ino_t ino)
  56 {
  57         struct ext2_xattr_handle *h;
  58         size_t sz;
  59         errcode_t err;
  60
  61         err = ext2fs_xattrs_open(current_fs, ino, &h);
  62         if (err)
  63                 return;
  64
  65         err = ext2fs_xattrs_read(h);
  66         if (err)
  67                 goto out;
  68
  69         err = ext2fs_xattrs_count(h, &sz);
  70         if (err || sz == 0)
  71                 goto out;
  72
  73         fprintf(out, "Extended attributes:\n");
  74         err = ext2fs_xattrs_iterate(h, dump_attr, out);
  75         if (err)
  76                 goto out;
  77
  78 out:
  79         err = ext2fs_xattrs_close(&h);
  80 }
  81
  82 void do_list_xattr(int argc, char **argv)
  83 {
  84         ext2_ino_t ino;
  85
  86         if (argc != 2) {
  87                 printf("%s: Usage: %s <file>\n", argv[0],
  88                        argv[0]);
  89                 return;
  90         }
  91
  92         if (check_fs_open(argv[0]))
  93                 return;
  94
  95         ino = string_to_inode(argv[1]);
  96         if (!ino)
  97                 return;
  98
  99         dump_inode_attributes(stdout, ino);
 100 }
 101
 102 void do_get_xattr(int argc, char **argv)
 103 {
 104         ext2_ino_t ino;
 105         struct ext2_xattr_handle *h;
 106         FILE *fp = NULL;
 107         char *buf = NULL;
 108         size_t buflen;
 109         int i;
 110         errcode_t err;
 111
 112         reset_getopt();
 113         while ((i = getopt(argc, argv, "f:")) != -1) {
 114                 switch (i) {
 115                 case 'f':
 116                         if (fp)
 117                                 fclose(fp);
 118                         fp = fopen(optarg, "w");
 119                         if (fp == NULL) {
 120                                 perror(optarg);
 121                                 return;
 122                         }
 123                         break;
 124                 default:
 125                         printf("%s: Usage: %s <file> <attr> [-f outfile]\n",
 126                                argv[0], argv[0]);
 127                         goto out2;
 128                 }
 129         }
 130
 131         if (optind != argc - 2) {
 132                 printf("%s: Usage: %s <file> <attr> [-f outfile]\n", argv[0],
 133                        argv[0]);
 134                 goto out2;
 135         }
 136
 137         if (check_fs_open(argv[0]))
 138                 goto out2;
 139
 140         ino = string_to_inode(argv[optind]);
 141         if (!ino)
 142                 goto out2;
 143
 144         err = ext2fs_xattrs_open(current_fs, ino, &h);
 145         if (err)
 146                 goto out2;
 147
 148         err = ext2fs_xattrs_read(h);
 149         if (err)
 150                 goto out;
 151
 152         err = ext2fs_xattr_get(h, argv[optind + 1], (void **)&buf, &buflen);
 153         if (err)
 154                 goto out;
 155
 156         if (fp) {
 157                 fwrite(buf, buflen, 1, fp);
 158         } else {
 159                 dump_xattr_string(stdout, buf, buflen);
 160                 printf("\n");
 161         }
 162
 163         ext2fs_free_mem(&buf);
 164 out:
 165         ext2fs_xattrs_close(&h);
 166         if (err)
 167                 com_err(argv[0], err, "while getting extended attribute");
 168 out2:
 169         if (fp)
 170                 fclose(fp);
 171 }
 172
 173 void do_set_xattr(int argc, char **argv)
 174 {
 175         ext2_ino_t ino;
 176         struct ext2_xattr_handle *h;
 177         FILE *fp = NULL;
 178         char *buf = NULL;
 179         size_t buflen;
 180         int i;
 181         errcode_t err;
 182
 183         reset_getopt();
 184         while ((i = getopt(argc, argv, "f:")) != -1) {
 185                 switch (i) {
 186                 case 'f':
 187                         if (fp)
 188                                 fclose(fp);
 189                         fp = fopen(optarg, "r");
 190                         if (fp == NULL) {
 191                                 perror(optarg);
 192                                 return;
 193                         }
 194                         break;
 195                 default:
 196                         printf("%s: Usage: %s <file> <attr> [-f infile | "
 197                                "value]\n", argv[0], argv[0]);
 198                         goto out2;
 199                 }
 200         }
 201
 202         if (optind != argc - 2 && optind != argc - 3) {
 203                 printf("%s: Usage: %s <file> <attr> [-f infile | value>]\n",
 204                        argv[0], argv[0]);
 205                 goto out2;
 206         }
 207
 208         if (check_fs_open(argv[0]))
 209                 goto out2;
 210         if (check_fs_read_write(argv[0]))
 211                 goto out2;
 212         if (check_fs_bitmaps(argv[0]))
 213                 goto out2;
 214
 215         ino = string_to_inode(argv[optind]);
 216         if (!ino)
 217                 goto out2;
 218
 219         err = ext2fs_xattrs_open(current_fs, ino, &h);
 220         if (err)
 221                 goto out2;
 222
 223         err = ext2fs_xattrs_read(h);
 224         if (err)
 225                 goto out;
 226
 227         if (fp) {
 228                 err = ext2fs_get_mem(current_fs->blocksize, &buf);
 229                 if (err)
 230                         goto out;
 231                 buflen = fread(buf, 1, current_fs->blocksize, fp);
 232         } else {
 233                 buf = argv[optind + 2];
 234                 buflen = strlen(argv[optind + 2]);
 235         }
 236
 237         err = ext2fs_xattr_set(h, argv[optind + 1], buf, buflen);
 238         if (err)
 239                 goto out;
 240
 241         err = ext2fs_xattrs_write(h);
 242         if (err)
 243                 goto out;
 244
 245 out:
 246         ext2fs_xattrs_close(&h);
 247         if (err)
 248                 com_err(argv[0], err, "while setting extended attribute");
 249 out2:
 250         if (fp) {
 251                 fclose(fp);
 252                 ext2fs_free_mem(&buf);
 253         }
 254 }
 255
 256 void do_rm_xattr(int argc, char **argv)
 257 {
 258         ext2_ino_t ino;
 259         struct ext2_xattr_handle *h;
 260         int i;
 261         errcode_t err;
 262
 263         if (argc < 3) {
 264                 printf("%s: Usage: %s <file> <attrs>...\n", argv[0], argv[0]);
 265                 return;
 266         }
 267
 268         if (check_fs_open(argv[0]))
 269                 return;
 270         if (check_fs_read_write(argv[0]))
 271                 return;
 272         if (check_fs_bitmaps(argv[0]))
 273                 return;
 274
 275         ino = string_to_inode(argv[1]);
 276         if (!ino)
 277                 return;
 278
 279         err = ext2fs_xattrs_open(current_fs, ino, &h);
 280         if (err)
 281                 return;
 282
 283         err = ext2fs_xattrs_read(h);
 284         if (err)
 285                 goto out;
 286
 287         for (i = 2; i < argc; i++) {
 288                 size_t buflen;
 289                 char *buf;
 290
 291                 err = ext2fs_xattr_remove(h, argv[i]);
 292                 if (err)
 293                         goto out;
 294         }
 295
 296         err = ext2fs_xattrs_write(h);
 297         if (err)
 298                 goto out;
 299 out:
 300         ext2fs_xattrs_close(&h);
 301         if (err)
 302                 com_err(argv[0], err, "while removing extended attribute");
 303 }