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                         goto print_usage;
 200                 }
 201         }
 202
 203         if (!(fp && optind == argc - 2) && !(!fp && optind == argc - 3)) {
 204         print_usage:
 205                 printf("Usage:\t%s <file> <attr> <value>\n", argv[0]);
 206                 printf("\t%s -f <value_file> <file> <attr>\n", argv[0]);
 207                 goto out2;
 208         }
 209
 210         if (check_fs_open(argv[0]))
 211                 goto out2;
 212         if (check_fs_read_write(argv[0]))
 213                 goto out2;
 214         if (check_fs_bitmaps(argv[0]))
 215                 goto out2;
 216
 217         ino = string_to_inode(argv[optind]);
 218         if (!ino)
 219                 goto out2;
 220
 221         err = ext2fs_xattrs_open(current_fs, ino, &h);
 222         if (err)
 223                 goto out2;
 224
 225         err = ext2fs_xattrs_read(h);
 226         if (err)
 227                 goto out;
 228
 229         if (fp) {
 230                 err = ext2fs_get_mem(current_fs->blocksize, &buf);
 231                 if (err)
 232                         goto out;
 233                 buflen = fread(buf, 1, current_fs->blocksize, fp);
 234         } else {
 235                 buf = argv[optind + 2];
 236                 buflen = strlen(argv[optind + 2]);
 237         }
 238
 239         err = ext2fs_xattr_set(h, argv[optind + 1], buf, buflen);
 240         if (err)
 241                 goto out;
 242
 243         err = ext2fs_xattrs_write(h);
 244         if (err)
 245                 goto out;
 246
 247 out:
 248         ext2fs_xattrs_close(&h);
 249         if (err)
 250                 com_err(argv[0], err, "while setting extended attribute");
 251 out2:
 252         if (fp) {
 253                 fclose(fp);
 254                 ext2fs_free_mem(&buf);
 255         }
 256 }
 257
 258 void do_rm_xattr(int argc, char **argv)
 259 {
 260         ext2_ino_t ino;
 261         struct ext2_xattr_handle *h;
 262         int i;
 263         errcode_t err;
 264
 265         if (argc < 3) {
 266                 printf("%s: Usage: %s <file> <attrs>...\n", argv[0], argv[0]);
 267                 return;
 268         }
 269
 270         if (check_fs_open(argv[0]))
 271                 return;
 272         if (check_fs_read_write(argv[0]))
 273                 return;
 274         if (check_fs_bitmaps(argv[0]))
 275                 return;
 276
 277         ino = string_to_inode(argv[1]);
 278         if (!ino)
 279                 return;
 280
 281         err = ext2fs_xattrs_open(current_fs, ino, &h);
 282         if (err)
 283                 return;
 284
 285         err = ext2fs_xattrs_read(h);
 286         if (err)
 287                 goto out;
 288
 289         for (i = 2; i < argc; i++) {
 290                 err = ext2fs_xattr_remove(h, argv[i]);
 291                 if (err)
 292                         goto out;
 293         }
 294
 295         err = ext2fs_xattrs_write(h);
 296         if (err)
 297                 goto out;
 298 out:
 299         ext2fs_xattrs_close(&h);
 300         if (err)
 301                 com_err(argv[0], err, "while removing extended attribute");
 302 }