source3/utils/mvxattr.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    xattr renaming
   4    Copyright (C) Ralph Boehme 2017
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "popt_common.h"
  23 #include <ftw.h>
  24
  25 static struct rename_xattr_state {
  26         int follow_symlink;
  27         int print;
  28         int force;
  29         int verbose;
  30         char *xattr_from;
  31         char *xattr_to;
  32 } state;
  33
  34 static int rename_xattr(const char *path,
  35                         const struct stat *sb,
  36                         int typeflag,
  37                         struct FTW *ftwbuf)
  38 {
  39         ssize_t len;
  40         int ret;
  41
  42         if (typeflag == FTW_SL) {
  43                 d_printf("Ignoring symlink %s\n", path);
  44                 return 0;
  45         }
  46
  47         if (state.verbose) {
  48                 d_printf("%s\n", path);
  49         }
  50
  51         len = getxattr(path, state.xattr_from, NULL, 0);
  52         if (len < 0) {
  53                 if (errno == ENOATTR) {
  54                         return 0;
  55                 }
  56                 d_printf("getxattr [%s] failed [%s]\n",
  57                          path, strerror(errno));
  58                 return -1;
  59         }
  60
  61         {
  62                 uint8_t buf[len];
  63
  64                 len = getxattr(path, state.xattr_from, &buf[0], len);
  65                 if (len == -1) {
  66                         d_printf("getxattr [%s] failed [%s]\n",
  67                                  path, strerror(errno));
  68                         return -1;
  69                 }
  70
  71                 ret = setxattr(path, state.xattr_to, &buf[0], len, XATTR_CREATE);
  72                 if (ret != 0) {
  73                         if (errno != EEXIST) {
  74                                 d_printf("setxattr [%s] failed [%s]\n",
  75                                          path, strerror(errno));
  76                                 return -1;
  77                         }
  78                         if (!state.force) {
  79                                 d_printf("destination [%s:%s] exists, use -f to force\n",
  80                                          path, state.xattr_to);
  81                                 return -1;
  82                         }
  83                         ret = setxattr(path, state.xattr_to, &buf[0], len, XATTR_REPLACE);
  84                         if (ret != 0) {
  85                                 d_printf("setxattr [%s:%s] failed [%s]\n",
  86                                          path, state.xattr_to, strerror(errno));
  87                                 return -1;
  88                         }
  89                 }
  90
  91                 ret = removexattr(path, state.xattr_from);
  92                 if (ret != 0) {
  93                         d_printf("removexattr [%s:%s] failed [%s]\n",
  94                                  path, state.xattr_from, strerror(errno));
  95                         return -1;
  96                 }
  97
  98                 if (state.print) {
  99                         d_printf("Renamed %s to %s on %s\n",
 100                                  state.xattr_from, state.xattr_to, path);
 101                 }
 102         }
 103
 104         return 0;
 105 }
 106
 107 int main(int argc, const char *argv[])
 108 {
 109         int c;
 110         const char *path = NULL;
 111         poptContext pc = NULL;
 112         struct poptOption long_options[] = {
 113                 POPT_AUTOHELP
 114                 {
 115                         .longName   = "from",
 116                         .shortName  = 's',
 117                         .argInfo    = POPT_ARG_STRING,
 118                         .arg        = &state.xattr_from,
 119                         .val        = 's',
 120                         .descrip    = "xattr source name",
 121                 },
 122                 {
 123                         .longName   = "to",
 124                         .shortName  = 'd',
 125                         .argInfo    = POPT_ARG_STRING,
 126                         .arg        = &state.xattr_to,
 127                         .val        = 'd',
 128                         .descrip    = "xattr destination name",
 129                 },
 130                 {
 131                         .longName   = "follow-symlinks",
 132                         .shortName  = 'l',
 133                         .argInfo    = POPT_ARG_NONE,
 134                         .arg        = &state.follow_symlink,
 135                         .val        = 'l',
 136                         .descrip    = "follow symlinks, the default is to "
 137                                       "ignore them",
 138                 },
 139                 {
 140                         .longName   = "print",
 141                         .shortName  = 'p',
 142                         .argInfo    = POPT_ARG_NONE,
 143                         .arg        = &state.print,
 144                         .val        = 'p',
 145                         .descrip    = "print files where the xattr got "
 146                                       "renamed",
 147                 },
 148                 {
 149                         .longName   = "verbose",
 150                         .shortName  = 'v',
 151                         .argInfo    = POPT_ARG_NONE,
 152                         .arg        = &state.verbose,
 153                         .val        = 'v',
 154                         .descrip    = "print files as they are checked",
 155                 },
 156                 {
 157                         .longName   = "force",
 158                         .shortName  = 'f',
 159                         .argInfo    = POPT_ARG_NONE,
 160                         .arg        = &state.force,
 161                         .val        = 'f',
 162                         .descrip    = "force overwriting of destination xattr",
 163                 },
 164                 POPT_TABLEEND
 165         };
 166         TALLOC_CTX *frame = talloc_stackframe();
 167         const char *s = NULL;
 168         int ret = 0;
 169
 170         if (getuid() != 0) {
 171                 d_printf("%s only works as root!\n", argv[0]);
 172                 ret = 1;
 173                 goto done;
 174         }
 175
 176         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 177         poptSetOtherOptionHelp(pc, "-s STRING -d STRING PATH [PATH ...]");
 178
 179         while ((c = poptGetNextOpt(pc)) != -1) {
 180                 switch (c) {
 181                 case 's':
 182                         s = poptGetOptArg(pc);
 183                         state.xattr_from = talloc_strdup(frame, s);
 184                         if (state.xattr_from == NULL) {
 185                                 ret = 1;
 186                                 goto done;
 187                         }
 188                         break;
 189                 case 'd':
 190                         s = poptGetOptArg(pc);
 191                         state.xattr_to = talloc_strdup(frame, s);
 192                         if (state.xattr_to == NULL) {
 193                                 ret = 1;
 194                                 goto done;
 195                         }
 196                         break;
 197                 }
 198         }
 199
 200         if (state.xattr_from == NULL || state.xattr_to == NULL) {
 201                 poptPrintUsage(pc, stderr, 0);
 202                 ret = 1;
 203                 goto done;
 204         }
 205
 206         if (poptPeekArg(pc) == NULL) {
 207                 poptPrintUsage(pc, stderr, 0);
 208                 ret = 1;
 209                 goto done;
 210         }
 211
 212         while ((path = poptGetArg(pc)) != NULL) {
 213                 ret = nftw(path, rename_xattr, 256,
 214                            state.follow_symlink ? 0 : FTW_PHYS);
 215         }
 216
 217 done:
 218         poptFreeContext(pc);
 219
 220         TALLOC_FREE(frame);
 221         return ret;
 222 }