source/smbd/close.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    file closing
   5    Copyright (C) Andrew Tridgell 1992-1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern int DEBUGLEVEL;
  25
  26 /****************************************************************************
  27 run a file if it is a magic script
  28 ****************************************************************************/
  29 static void check_magic(files_struct *fsp,connection_struct *conn)
  30 {
  31   if (!*lp_magicscript(SNUM(conn)))
  32     return;
  33
  34   DEBUG(5,("checking magic for %s\n",fsp->fsp_name));
  35
  36   {
  37     char *p;
  38     if (!(p = strrchr(fsp->fsp_name,'/')))
  39       p = fsp->fsp_name;
  40     else
  41       p++;
  42
  43     if (!strequal(lp_magicscript(SNUM(conn)),p))
  44       return;
  45   }
  46
  47   {
  48     int ret;
  49     pstring magic_output;
  50     pstring fname;
  51         SMB_STRUCT_STAT st;
  52         int tmp_fd, outfd;
  53
  54     pstrcpy(fname,fsp->fsp_name);
  55     if (*lp_magicoutput(SNUM(conn)))
  56       pstrcpy(magic_output,lp_magicoutput(SNUM(conn)));
  57     else
  58       slprintf(magic_output,sizeof(fname)-1, "%s.out",fname);
  59
  60     chmod(fname,0755);
  61     ret = smbrun(fname,&tmp_fd);
  62     DEBUG(3,("Invoking magic command %s gave %d\n",fname,ret));
  63     unlink(fname);
  64         if (ret != 0 || tmp_fd == -1) {
  65                 if (tmp_fd != -1)
  66                         close(tmp_fd);
  67                 return;
  68         }
  69         outfd = open(magic_output, O_CREAT|O_EXCL|O_RDWR, 0600);
  70         if (outfd == -1) {
  71                 close(tmp_fd);
  72                 return;
  73         }
  74
  75         if (sys_fstat(tmp_fd,&st) == -1) {
  76                 close(tmp_fd);
  77                 close(outfd);
  78                 return;
  79         }
  80
  81         transfer_file(tmp_fd,outfd,st.st_size, NULL,0,0);
  82         close(tmp_fd);
  83         close(outfd);
  84   }
  85 }
  86
  87 /****************************************************************************
  88   Common code to close a file or a directory.
  89 ****************************************************************************/
  90
  91 static int close_filestruct(files_struct *fsp)
  92 {
  93         connection_struct *conn = fsp->conn;
  94         int ret = 0;
  95
  96         if(flush_write_cache(fsp, CLOSE_FLUSH) == -1)
  97                 ret = -1;
  98
  99         delete_write_cache(fsp);
 100
 101         fsp->is_directory = False;
 102         fsp->stat_open = False;
 103
 104         conn->num_files_open--;
 105         if(fsp->wbmpx_ptr) {
 106                 free((char *)fsp->wbmpx_ptr);
 107                 fsp->wbmpx_ptr = NULL;
 108         }
 109
 110         return ret;
 111 }
 112
 113 /****************************************************************************
 114  Close a file.
 115
 116  If normal_close is 1 then this came from a normal SMBclose (or equivalent)
 117  operation otherwise it came as the result of some other operation such as
 118  the closing of the connection. In the latter case printing and
 119  magic scripts are not run.
 120 ****************************************************************************/
 121
 122 static int close_normal_file(files_struct *fsp, BOOL normal_close)
 123 {
 124         share_mode_entry *share_entry = NULL;
 125         size_t share_entry_count = 0;
 126         BOOL delete_on_close = False;
 127         connection_struct *conn = fsp->conn;
 128         int err = 0;
 129         int err1 = 0;
 130
 131         remove_pending_lock_requests_by_fid(fsp);
 132
 133         /*
 134          * If we're flushing on a close we can get a write
 135          * error here, we must remember this.
 136          */
 137
 138         if (close_filestruct(fsp) == -1)
 139                 err1 = -1;
 140
 141         if (fsp->print_file) {
 142                 print_fsp_end(fsp, normal_close);
 143                 file_free(fsp);
 144                 return 0;
 145         }
 146
 147         /*
 148          * Lock the share entries, and determine if we should delete
 149          * on close. If so delete whilst the lock is still in effect.
 150          * This prevents race conditions with the file being created. JRA.
 151          */
 152
 153         lock_share_entry_fsp(fsp);
 154         share_entry_count = del_share_mode(fsp, &share_entry);
 155
 156         /*
 157          * We delete on close if it's the last open, and the
 158          * delete on close flag was set in the entry we just deleted.
 159          */
 160
 161         if ((share_entry_count == 0) && share_entry &&
 162                         GET_DELETE_ON_CLOSE_FLAG(share_entry->share_mode) )
 163                 delete_on_close = True;
 164
 165         safe_free(share_entry);
 166
 167         /*
 168          * NT can set delete_on_close of the last open
 169          * reference to a file.
 170          */
 171
 172     if (normal_close && delete_on_close) {
 173         DEBUG(5,("close_file: file %s. Delete on close was set - deleting file.\n",
 174             fsp->fsp_name));
 175                 if(fsp->conn->vfs_ops.unlink(conn,dos_to_unix(fsp->fsp_name, False)) != 0) {
 176           /*
 177            * This call can potentially fail as another smbd may have
 178            * had the file open with delete on close set and deleted
 179            * it when its last reference to this file went away. Hence
 180            * we log this but not at debug level zero.
 181            */
 182
 183           DEBUG(5,("close_file: file %s. Delete on close was set and unlink failed \
 184 with error %s\n", fsp->fsp_name, strerror(errno) ));
 185         }
 186     }
 187
 188         unlock_share_entry_fsp(fsp);
 189
 190         if(EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type))
 191                 release_file_oplock(fsp);
 192
 193         locking_close_file(fsp);
 194
 195         err = fd_close(conn, fsp);
 196
 197         /* check for magic scripts */
 198         if (normal_close) {
 199                 check_magic(fsp,conn);
 200         }
 201
 202
 203         DEBUG(2,("%s closed file %s (numopen=%d) %s\n",
 204                  conn->user,fsp->fsp_name,
 205                  conn->num_files_open, err ? strerror(err) : ""));
 206
 207         if (fsp->fsp_name) {
 208                 string_free(&fsp->fsp_name);
 209         }
 210
 211         file_free(fsp);
 212
 213         if (err == -1 || err1 == -1)
 214                 return -1;
 215         else
 216                 return 0;
 217 }
 218
 219 /****************************************************************************
 220  Close a directory opened by an NT SMB call.
 221 ****************************************************************************/
 222
 223 static int close_directory(files_struct *fsp, BOOL normal_close)
 224 {
 225         remove_pending_change_notify_requests_by_fid(fsp);
 226
 227         /*
 228          * NT can set delete_on_close of the last open
 229          * reference to a directory also.
 230          */
 231
 232         if (normal_close && fsp->directory_delete_on_close) {
 233                 BOOL ok = rmdir_internals(fsp->conn, fsp->fsp_name);
 234                 DEBUG(5,("close_directory: %s. Delete on close was set - deleting directory %s.\n",
 235                         fsp->fsp_name, ok ? "succeeded" : "failed" ));
 236
 237                 /*
 238                  * Ensure we remove any change notify requests that would
 239                  * now fail as the directory has been deleted.
 240                  */
 241
 242                 if(ok)
 243                         remove_pending_change_notify_requests_by_filename(fsp);
 244     }
 245
 246         /*
 247          * Do the code common to files and directories.
 248          */
 249         close_filestruct(fsp);
 250
 251         if (fsp->fsp_name)
 252                 string_free(&fsp->fsp_name);
 253
 254         file_free(fsp);
 255
 256         return 0;
 257 }
 258
 259 /****************************************************************************
 260  Close a file opened with null permissions in order to read permissions.
 261 ****************************************************************************/
 262
 263 static int close_statfile(files_struct *fsp, BOOL normal_close)
 264 {
 265         close_filestruct(fsp);
 266
 267         if (fsp->fsp_name)
 268                 string_free(&fsp->fsp_name);
 269
 270         file_free(fsp);
 271
 272         return 0;
 273 }
 274
 275 /****************************************************************************
 276  Close a directory opened by an NT SMB call.
 277 ****************************************************************************/
 278
 279 int close_file(files_struct *fsp, BOOL normal_close)
 280 {
 281         if(fsp->is_directory)
 282                 return close_directory(fsp, normal_close);
 283         else if(fsp->stat_open)
 284                 return close_statfile(fsp, normal_close);
 285         return close_normal_file(fsp, normal_close);
 286 }