source3/lib/filename_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Filename utility functions.
   4    Copyright (C) Tim Prouty 2009
   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 #include "includes.h"
  20
  21 /**
  22  * XXX: This is temporary and there should be no callers of this outside of
  23  * this file once smb_filename is plumbed through all path based operations.
  24  * The one legitimate caller currently is smb_fname_str_dbg(), which this
  25  * could be made static for.
  26  */
  27 NTSTATUS get_full_smb_filename(TALLOC_CTX *ctx,
  28                                const struct smb_filename *smb_fname,
  29                                char **full_name)
  30 {
  31         if (smb_fname->stream_name) {
  32                 /* stream_name must always be NULL if there is no stream. */
  33                 SMB_ASSERT(smb_fname->stream_name[0] != '\0');
  34
  35                 *full_name = talloc_asprintf(ctx, "%s%s", smb_fname->base_name,
  36                                              smb_fname->stream_name);
  37         } else {
  38                 *full_name = talloc_strdup(ctx, smb_fname->base_name);
  39         }
  40
  41         if (!*full_name) {
  42                 return NT_STATUS_NO_MEMORY;
  43         }
  44
  45         return NT_STATUS_OK;
  46 }
  47
  48 /**
  49  * There are actually legitimate callers of this such as functions that
  50  * enumerate streams using the vfs_streaminfo interface and then want to
  51  * operate on each stream.
  52  */
  53 struct smb_filename *synthetic_smb_fname(TALLOC_CTX *mem_ctx,
  54                                          const char *base_name,
  55                                          const char *stream_name,
  56                                          const SMB_STRUCT_STAT *psbuf)
  57 {
  58         struct smb_filename smb_fname_loc = { 0, };
  59
  60         /* Setup the base_name/stream_name. */
  61         smb_fname_loc.base_name = discard_const_p(char, base_name);
  62         smb_fname_loc.stream_name = discard_const_p(char, stream_name);
  63
  64         /* Copy the psbuf if one was given. */
  65         if (psbuf)
  66                 smb_fname_loc.st = *psbuf;
  67
  68         /* Let cp_smb_filename() do the heavy lifting. */
  69         return cp_smb_filename(mem_ctx, &smb_fname_loc);
  70 }
  71
  72 /**
  73  * XXX: This is temporary and there should be no callers of this once
  74  * smb_filename is plumbed through all path based operations.
  75  */
  76 struct smb_filename *synthetic_smb_fname_split(TALLOC_CTX *ctx,
  77                                                const char *fname,
  78                                                const SMB_STRUCT_STAT *psbuf)
  79 {
  80         const char *stream_name = NULL;
  81         char *base_name = NULL;
  82         struct smb_filename *ret;
  83
  84         if (!lp_posix_pathnames()) {
  85                 stream_name = strchr_m(fname, ':');
  86         }
  87
  88         /* Setup the base_name/stream_name. */
  89         if (stream_name) {
  90                 base_name = talloc_strndup(ctx, fname,
  91                                            PTR_DIFF(stream_name, fname));
  92         } else {
  93                 base_name = talloc_strdup(ctx, fname);
  94         }
  95
  96         if (!base_name) {
  97                 return NULL;
  98         }
  99
 100         ret = synthetic_smb_fname(ctx, base_name, stream_name, psbuf);
 101         TALLOC_FREE(base_name);
 102         return ret;
 103 }
 104
 105 /**
 106  * Return a string using the talloc_tos()
 107  */
 108 const char *smb_fname_str_dbg(const struct smb_filename *smb_fname)
 109 {
 110         char *fname = NULL;
 111         NTSTATUS status;
 112
 113         if (smb_fname == NULL) {
 114                 return "";
 115         }
 116         status = get_full_smb_filename(talloc_tos(), smb_fname, &fname);
 117         if (!NT_STATUS_IS_OK(status)) {
 118                 return "";
 119         }
 120         return fname;
 121 }
 122
 123 /**
 124  * Return a debug string of the path name of an fsp using the talloc_tos().
 125  */
 126 const char *fsp_str_dbg(const struct files_struct *fsp)
 127 {
 128         return smb_fname_str_dbg(fsp->fsp_name);
 129 }
 130
 131 /**
 132  * Create a debug string for the fnum of an fsp.
 133  *
 134  * This is allocated to talloc_tos() or a string constant
 135  * in certain corner cases. The returned string should
 136  * hence not be free'd directly but only via the talloc stack.
 137  */
 138 const char *fsp_fnum_dbg(const struct files_struct *fsp)
 139 {
 140         char *str;
 141
 142         if (fsp == NULL) {
 143                 return "fnum [fsp is NULL]";
 144         }
 145
 146         if (fsp->fnum == FNUM_FIELD_INVALID) {
 147                 return "fnum [invalid value]";
 148         }
 149
 150         str = talloc_asprintf(talloc_tos(), "fnum %llu",
 151                               (unsigned long long)fsp->fnum);
 152         if (str == NULL) {
 153                 DEBUG(1, ("%s: talloc_asprintf failed\n", __FUNCTION__));
 154                 return "fnum [talloc failed!]";
 155         }
 156
 157         return str;
 158 }
 159
 160 struct smb_filename *cp_smb_filename(TALLOC_CTX *mem_ctx,
 161                                      const struct smb_filename *in)
 162 {
 163         struct smb_filename *out;
 164         size_t base_len = 0;
 165         size_t stream_len = 0;
 166         size_t lcomp_len = 0;
 167         int num = 0;
 168
 169         /* stream_name must always be NULL if there is no stream. */
 170         if (in->stream_name) {
 171                 SMB_ASSERT(in->stream_name[0] != '\0');
 172         }
 173
 174         if (in->base_name != NULL) {
 175                 base_len = strlen(in->base_name) + 1;
 176                 num += 1;
 177         }
 178         if (in->stream_name != NULL) {
 179                 stream_len = strlen(in->stream_name) + 1;
 180                 num += 1;
 181         }
 182         if (in->original_lcomp != NULL) {
 183                 lcomp_len = strlen(in->original_lcomp) + 1;
 184                 num += 1;
 185         }
 186
 187         out = talloc_pooled_object(mem_ctx, struct smb_filename,
 188                                 num, stream_len + base_len + lcomp_len);
 189         if (out == NULL) {
 190                 return NULL;
 191         }
 192         ZERO_STRUCTP(out);
 193
 194         /*
 195          * The following allocations cannot fails as we
 196          * pre-allocated space for them in the out pooled
 197          * object.
 198          */
 199         if (in->base_name != NULL) {
 200                 out->base_name = talloc_memdup(
 201                                 out, in->base_name, base_len);
 202         }
 203         if (in->stream_name != NULL) {
 204                 out->stream_name = talloc_memdup(
 205                                 out, in->stream_name, stream_len);
 206         }
 207         if (in->original_lcomp != NULL) {
 208                 out->original_lcomp = talloc_memdup(
 209                                 out, in->original_lcomp, lcomp_len);
 210         }
 211         out->st = in->st;
 212         return out;
 213 }
 214
 215 /****************************************************************************
 216  Simple check to determine if the filename is a stream.
 217  ***************************************************************************/
 218 bool is_ntfs_stream_smb_fname(const struct smb_filename *smb_fname)
 219 {
 220         /* stream_name must always be NULL if there is no stream. */
 221         if (smb_fname->stream_name) {
 222                 SMB_ASSERT(smb_fname->stream_name[0] != '\0');
 223         }
 224
 225         if (lp_posix_pathnames()) {
 226                 return false;
 227         }
 228
 229         return smb_fname->stream_name != NULL;
 230 }
 231
 232 /****************************************************************************
 233  Returns true if the filename's stream == "::$DATA"
 234  ***************************************************************************/
 235 bool is_ntfs_default_stream_smb_fname(const struct smb_filename *smb_fname)
 236 {
 237         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 238                 return false;
 239         }
 240
 241         return strcasecmp_m(smb_fname->stream_name, "::$DATA") == 0;
 242 }
 243
 244 /****************************************************************************
 245  Filter out Windows invalid EA names (list probed from Windows 2012).
 246 ****************************************************************************/
 247
 248 static char bad_ea_name_chars[] = "\"*+,/:;<=>?[\\]|";
 249
 250 bool is_invalid_windows_ea_name(const char *name)
 251 {
 252         int i;
 253         /* EA name is pulled as ascii so we can examine
 254            individual bytes here. */
 255         for (i = 0; name[i] != 0; i++) {
 256                 int val = (name[i] & 0xff);
 257                 if (val < ' ' || strchr(bad_ea_name_chars, val)) {
 258                         return true;
 259                 }
 260         }
 261         return false;
 262 }
 263
 264 bool ea_list_has_invalid_name(struct ea_list *ea_list)
 265 {
 266         if (lp_posix_pathnames()) {
 267                 return false;
 268         }
 269
 270         for (;ea_list; ea_list = ea_list->next) {
 271                 if (is_invalid_windows_ea_name(ea_list->ea.name)) {
 272                         return true;
 273                 }
 274         }
 275         return false;
 276 }