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         if (strcmp(name, "system.data") != 0) {
  49                 fprintf(out, " = \"");
  50                 dump_xattr_string(out, value, value_len);
  51                 fprintf(out, "\"");
  52         }
  53         fprintf(out, " (%zu)\n", value_len);
  54
  55         return 0;
  56 }
  57
  58 void dump_inode_attributes(FILE *out, ext2_ino_t ino)
  59 {
  60         struct ext2_xattr_handle *h;
  61         size_t sz;
  62         errcode_t err;
  63
  64         err = ext2fs_xattrs_open(current_fs, ino, &h);
  65         if (err)
  66                 return;
  67
  68         err = ext2fs_xattrs_read(h);
  69         if (err)
  70                 goto out;
  71
  72         err = ext2fs_xattrs_count(h, &sz);
  73         if (err || sz == 0)
  74                 goto out;
  75
  76         fprintf(out, "Extended attributes:\n");
  77         err = ext2fs_xattrs_iterate(h, dump_attr, out);
  78         if (err)
  79                 goto out;
  80
  81 out:
  82         err = ext2fs_xattrs_close(&h);
  83 }
  84
  85 void do_list_xattr(int argc, char **argv)
  86 {
  87         ext2_ino_t ino;
  88
  89         if (argc != 2) {
  90                 printf("%s: Usage: %s <file>\n", argv[0],
  91                        argv[0]);
  92                 return;
  93         }
  94
  95         if (check_fs_open(argv[0]))
  96                 return;
  97
  98         ino = string_to_inode(argv[1]);
  99         if (!ino)
 100                 return;
 101
 102         dump_inode_attributes(stdout, ino);
 103 }
 104
 105 void do_get_xattr(int argc, char **argv)
 106 {
 107         ext2_ino_t ino;
 108         struct ext2_xattr_handle *h;
 109         FILE *fp = NULL;
 110         char *buf = NULL;
 111         size_t buflen;
 112         int i;
 113         errcode_t err;
 114
 115         reset_getopt();
 116         while ((i = getopt(argc, argv, "f:")) != -1) {
 117                 switch (i) {
 118                 case 'f':
 119                         if (fp)
 120                                 fclose(fp);
 121                         fp = fopen(optarg, "w");
 122                         if (fp == NULL) {
 123                                 perror(optarg);
 124                                 return;
 125                         }
 126                         break;
 127                 default:
 128                         printf("%s: Usage: %s <file> <attr> [-f outfile]\n",
 129                                argv[0], argv[0]);
 130                         goto out2;
 131                 }
 132         }
 133
 134         if (optind != argc - 2) {
 135                 printf("%s: Usage: %s <file> <attr> [-f outfile]\n", argv[0],
 136                        argv[0]);
 137                 goto out2;
 138         }
 139
 140         if (check_fs_open(argv[0]))
 141                 goto out2;
 142
 143         ino = string_to_inode(argv[optind]);
 144         if (!ino)
 145                 goto out2;
 146
 147         err = ext2fs_xattrs_open(current_fs, ino, &h);
 148         if (err)
 149                 goto out2;
 150
 151         err = ext2fs_xattrs_read(h);
 152         if (err)
 153                 goto out;
 154
 155         err = ext2fs_xattr_get(h, argv[optind + 1], (void **)&buf, &buflen);
 156         if (err)
 157                 goto out;
 158
 159         if (fp) {
 160                 fwrite(buf, buflen, 1, fp);
 161         } else {
 162                 dump_xattr_string(stdout, buf, buflen);
 163                 printf("\n");
 164         }
 165
 166         ext2fs_free_mem(&buf);
 167 out:
 168         ext2fs_xattrs_close(&h);
 169         if (err)
 170                 com_err(argv[0], err, "while getting extended attribute");
 171 out2:
 172         if (fp)
 173                 fclose(fp);
 174 }
 175
 176 void do_set_xattr(int argc, char **argv)
 177 {
 178         ext2_ino_t ino;
 179         struct ext2_xattr_handle *h;
 180         FILE *fp = NULL;
 181         char *buf = NULL;
 182         size_t buflen;
 183         int i;
 184         errcode_t err;
 185
 186         reset_getopt();
 187         while ((i = getopt(argc, argv, "f:")) != -1) {
 188                 switch (i) {
 189                 case 'f':
 190                         if (fp)
 191                                 fclose(fp);
 192                         fp = fopen(optarg, "r");
 193                         if (fp == NULL) {
 194                                 perror(optarg);
 195                                 return;
 196                         }
 197                         break;
 198                 default:
 199                         printf("%s: Usage: %s <file> <attr> [-f infile | "
 200                                "value]\n", argv[0], argv[0]);
 201                         goto out2;
 202                 }
 203         }
 204
 205         if (optind != argc - 2 && optind != argc - 3) {
 206                 printf("%s: Usage: %s <file> <attr> [-f infile | value>]\n",
 207                        argv[0], argv[0]);
 208                 goto out2;
 209         }
 210
 211         if (check_fs_open(argv[0]))
 212                 goto out2;
 213         if (check_fs_read_write(argv[0]))
 214                 goto out2;
 215         if (check_fs_bitmaps(argv[0]))
 216                 goto out2;
 217
 218         ino = string_to_inode(argv[optind]);
 219         if (!ino)
 220                 goto out2;
 221
 222         err = ext2fs_xattrs_open(current_fs, ino, &h);
 223         if (err)
 224                 goto out2;
 225
 226         err = ext2fs_xattrs_read(h);
 227         if (err)
 228                 goto out;
 229
 230         if (fp) {
 231                 err = ext2fs_get_mem(current_fs->blocksize, &buf);
 232                 if (err)
 233                         goto out;
 234                 buflen = fread(buf, 1, current_fs->blocksize, fp);
 235         } else {
 236                 buf = argv[optind + 2];
 237                 buflen = strlen(argv[optind + 2]);
 238         }
 239
 240         err = ext2fs_xattr_set(h, argv[optind + 1], buf, buflen);
 241         if (err)
 242                 goto out;
 243
 244         err = ext2fs_xattrs_write(h);
 245         if (err)
 246                 goto out;
 247
 248 out:
 249         ext2fs_xattrs_close(&h);
 250         if (err)
 251                 com_err(argv[0], err, "while setting extended attribute");
 252 out2:
 253         if (fp) {
 254                 fclose(fp);
 255                 ext2fs_free_mem(&buf);
 256         }
 257 }
 258
 259 void do_rm_xattr(int argc, char **argv)
 260 {
 261         ext2_ino_t ino;
 262         struct ext2_xattr_handle *h;
 263         int i;
 264         errcode_t err;
 265
 266         if (argc < 3) {
 267                 printf("%s: Usage: %s <file> <attrs>...\n", argv[0], argv[0]);
 268                 return;
 269         }
 270
 271         if (check_fs_open(argv[0]))
 272                 return;
 273         if (check_fs_read_write(argv[0]))
 274                 return;
 275         if (check_fs_bitmaps(argv[0]))
 276                 return;
 277
 278         ino = string_to_inode(argv[1]);
 279         if (!ino)
 280                 return;
 281
 282         err = ext2fs_xattrs_open(current_fs, ino, &h);
 283         if (err)
 284                 return;
 285
 286         err = ext2fs_xattrs_read(h);
 287         if (err)
 288                 goto out;
 289
 290         for (i = 2; i < argc; i++) {
 291                 size_t buflen;
 292                 char *buf;
 293
 294                 err = ext2fs_xattr_remove(h, argv[i]);
 295                 if (err)
 296                         goto out;
 297         }
 298
 299         err = ext2fs_xattrs_write(h);
 300         if (err)
 301                 goto out;
 302 out:
 303         ext2fs_xattrs_close(&h);
 304         if (err)
 305                 com_err(argv[0], err, "while removing extended attribute");
 306 }