source3/smbd/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 SMB_VFS_STREAMINFO interface and then want to
  51  * operate on each stream.
  52  */
  53 NTSTATUS create_synthetic_smb_fname(TALLOC_CTX *ctx, const char *base_name,
  54                                     const char *stream_name,
  55                                     const SMB_STRUCT_STAT *psbuf,
  56                                     struct smb_filename **smb_fname_out)
  57 {
  58         struct smb_filename smb_fname_loc;
  59
  60         ZERO_STRUCT(smb_fname_loc);
  61
  62         /* Setup the base_name/stream_name. */
  63         smb_fname_loc.base_name = CONST_DISCARD(char *, base_name);
  64         smb_fname_loc.stream_name = CONST_DISCARD(char *, stream_name);
  65
  66         /* Copy the psbuf if one was given. */
  67         if (psbuf)
  68                 smb_fname_loc.st = *psbuf;
  69
  70         /* Let copy_smb_filename() do the heavy lifting. */
  71         return copy_smb_filename(ctx, &smb_fname_loc, smb_fname_out);
  72 }
  73
  74 /**
  75  * XXX: This is temporary and there should be no callers of this once
  76  * smb_filename is plumbed through all path based operations.
  77  */
  78 NTSTATUS create_synthetic_smb_fname_split(TALLOC_CTX *ctx,
  79                                           const char *fname,
  80                                           const SMB_STRUCT_STAT *psbuf,
  81                                           struct smb_filename **smb_fname_out)
  82 {
  83         NTSTATUS status;
  84         const char *stream_name = NULL;
  85         char *base_name = NULL;
  86
  87         if (!lp_posix_pathnames()) {
  88                 stream_name = strchr_m(fname, ':');
  89         }
  90
  91         /* Setup the base_name/stream_name. */
  92         if (stream_name) {
  93                 base_name = talloc_strndup(ctx, fname,
  94                                            PTR_DIFF(stream_name, fname));
  95         } else {
  96                 base_name = talloc_strdup(ctx, fname);
  97         }
  98
  99         if (!base_name) {
 100                 return NT_STATUS_NO_MEMORY;
 101         }
 102
 103         status = create_synthetic_smb_fname(ctx, base_name, stream_name, psbuf,
 104                                             smb_fname_out);
 105         TALLOC_FREE(base_name);
 106         return status;
 107 }
 108
 109 /**
 110  * Return a string using the talloc_tos()
 111  */
 112 const char *smb_fname_str_dbg(const struct smb_filename *smb_fname)
 113 {
 114         char *fname = NULL;
 115         NTSTATUS status;
 116
 117         if (smb_fname == NULL) {
 118                 return "";
 119         }
 120         status = get_full_smb_filename(talloc_tos(), smb_fname, &fname);
 121         if (!NT_STATUS_IS_OK(status)) {
 122                 return "";
 123         }
 124         return fname;
 125 }
 126
 127 /**
 128  * Return a debug string using the talloc_tos().  This can only be called from
 129  * DEBUG() macros due to the debut_ctx().
 130  */
 131 const char *fsp_str_dbg(const struct files_struct *fsp)
 132 {
 133         return smb_fname_str_dbg(fsp->fsp_name);
 134 }
 135
 136 NTSTATUS copy_smb_filename(TALLOC_CTX *ctx,
 137                            const struct smb_filename *smb_fname_in,
 138                            struct smb_filename **smb_fname_out)
 139 {
 140         /* stream_name must always be NULL if there is no stream. */
 141         if (smb_fname_in->stream_name) {
 142                 SMB_ASSERT(smb_fname_in->stream_name[0] != '\0');
 143         }
 144
 145         *smb_fname_out = talloc_zero(ctx, struct smb_filename);
 146         if (*smb_fname_out == NULL) {
 147                 return NT_STATUS_NO_MEMORY;
 148         }
 149
 150         if (smb_fname_in->base_name) {
 151                 (*smb_fname_out)->base_name =
 152                     talloc_strdup(*smb_fname_out, smb_fname_in->base_name);
 153                 if (!(*smb_fname_out)->base_name)
 154                         goto no_mem_err;
 155         }
 156
 157         if (smb_fname_in->stream_name) {
 158                 (*smb_fname_out)->stream_name =
 159                     talloc_strdup(*smb_fname_out, smb_fname_in->stream_name);
 160                 if (!(*smb_fname_out)->stream_name)
 161                         goto no_mem_err;
 162         }
 163
 164         if (smb_fname_in->original_lcomp) {
 165                 (*smb_fname_out)->original_lcomp =
 166                     talloc_strdup(*smb_fname_out, smb_fname_in->original_lcomp);
 167                 if (!(*smb_fname_out)->original_lcomp)
 168                         goto no_mem_err;
 169         }
 170
 171         (*smb_fname_out)->st = smb_fname_in->st;
 172         return NT_STATUS_OK;
 173
 174  no_mem_err:
 175         TALLOC_FREE(*smb_fname_out);
 176         return NT_STATUS_NO_MEMORY;
 177 }
 178
 179 /****************************************************************************
 180  Simple check to determine if the filename is a stream.
 181  ***************************************************************************/
 182 bool is_ntfs_stream_smb_fname(const struct smb_filename *smb_fname)
 183 {
 184         /* stream_name must always be NULL if there is no stream. */
 185         if (smb_fname->stream_name) {
 186                 SMB_ASSERT(smb_fname->stream_name[0] != '\0');
 187         }
 188
 189         if (lp_posix_pathnames()) {
 190                 return false;
 191         }
 192
 193         return smb_fname->stream_name != NULL;
 194 }
 195
 196 /****************************************************************************
 197  Returns true if the filename's stream == "::$DATA"
 198  ***************************************************************************/
 199 bool is_ntfs_default_stream_smb_fname(const struct smb_filename *smb_fname)
 200 {
 201         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 202                 return false;
 203         }
 204
 205         return StrCaseCmp(smb_fname->stream_name, "::$DATA") == 0;
 206 }