2 * Bacula low level File I/O routines. This routine simulates
3 * open(), read(), write(), and close(), but using native routines.
4 * I.e. on Windows, we use Windows APIs.
6 * Kern Sibbald, April MMIII
12 Copyright (C) 2000-2003 Kern Sibbald and John Walker
14 This program is free software; you can redistribute it and/or
15 modify it under the terms of the GNU General Public License as
16 published by the Free Software Foundation; either version 2 of
17 the License, or (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 General Public License for more details.
24 You should have received a copy of the GNU General Public
25 License along with this program; if not, write to the Free
26 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
34 /* ===============================================================
36 * U N I X AND W I N D O W S
38 * ===============================================================
41 int is_win32_stream(int stream)
44 case STREAM_WIN32_DATA:
45 case STREAM_WIN32_GZIP_DATA:
51 const char *stream_to_ascii(int stream)
56 case STREAM_GZIP_DATA:
58 case STREAM_SPARSE_GZIP_DATA:
59 return "GZIP sparse data";
60 case STREAM_WIN32_DATA:
62 case STREAM_WIN32_GZIP_DATA:
63 return "Win32 GZIP data";
64 case STREAM_UNIX_ATTRIBUTES:
65 return "File attributes";
66 case STREAM_FILE_DATA:
68 case STREAM_MD5_SIGNATURE:
69 return "MD5 signature";
70 case STREAM_UNIX_ATTRIBUTES_EX:
71 return "Extended attributes";
72 case STREAM_SPARSE_DATA:
74 case STREAM_PROGRAM_NAMES:
75 return "Program names";
76 case STREAM_PROGRAM_DATA:
77 return "Program data";
78 case STREAM_SHA1_SIGNATURE:
79 return "SHA1 signature";
81 sprintf(buf, "%d", stream);
82 return (const char *)buf;
88 /* ===============================================================
92 * ===============================================================
95 #if defined(HAVE_CYGWIN) || defined(HAVE_WIN32)
97 void unix_name_to_win32(POOLMEM **win32_name, char *name);
98 extern "C" HANDLE get_osfhandle(int fd);
102 void binit(BFILE *bfd)
104 memset(bfd, 0, sizeof(BFILE));
106 bfd->mode = BF_CLOSED;
107 bfd->use_backup_api = have_win32_api();
109 bfd->lpContext = NULL;
115 * Enables using the Backup API (win32_data).
116 * Returns 1 if function worked
117 * Returns 0 if failed (i.e. do not have Backup API on this machine)
119 int set_win32_backup(BFILE *bfd)
121 /* We enable if possible here */
122 bfd->use_backup_api = have_win32_api();
123 return bfd->use_backup_api;
127 int set_portable_backup(BFILE *bfd)
129 bfd->use_backup_api = 0;
134 * Return 1 if we are NOT using Win32 BackupWrite()
137 int is_portable_backup(BFILE *bfd)
139 return !bfd->use_backup_api;
144 return p_BackupRead && p_BackupWrite;
150 * Return 1 if we support the stream
151 * 0 if we do not support the stream
153 int is_stream_supported(int stream)
155 /* No Win32 backup on this machine */
158 case STREAM_GZIP_DATA:
159 case STREAM_SPARSE_GZIP_DATA:
162 case STREAM_WIN32_DATA:
163 case STREAM_WIN32_GZIP_DATA:
164 return have_win32_api();
168 case STREAM_GZIP_DATA:
169 case STREAM_SPARSE_GZIP_DATA:
171 case STREAM_UNIX_ATTRIBUTES:
172 case STREAM_FILE_DATA:
173 case STREAM_MD5_SIGNATURE:
174 case STREAM_UNIX_ATTRIBUTES_EX:
175 case STREAM_SPARSE_DATA:
176 case STREAM_PROGRAM_NAMES:
177 case STREAM_PROGRAM_DATA:
178 case STREAM_SHA1_SIGNATURE:
179 case 0: /* compatibility with old tapes */
185 HANDLE bget_handle(BFILE *bfd)
190 int bopen(BFILE *bfd, const char *fname, int flags, mode_t mode)
192 POOLMEM *win32_fname;
193 DWORD dwaccess, dwflags;
195 /* Convert to Windows path format */
196 win32_fname = get_pool_memory(PM_FNAME);
197 unix_name_to_win32(&win32_fname, (char *)fname);
199 if (flags & O_CREAT) { /* Create */
200 if (bfd->use_backup_api) {
201 dwaccess = GENERIC_WRITE|FILE_ALL_ACCESS|WRITE_OWNER|WRITE_DAC|ACCESS_SYSTEM_SECURITY;
202 dwflags = FILE_FLAG_BACKUP_SEMANTICS;
204 dwaccess = GENERIC_WRITE;
207 bfd->fh = CreateFile(win32_fname,
208 dwaccess, /* Requested access */
210 NULL, /* SecurityAttributes */
211 CREATE_ALWAYS, /* CreationDisposition */
212 dwflags, /* Flags and attributes */
213 NULL); /* TemplateFile */
214 bfd->mode = BF_WRITE;
216 } else if (flags & O_WRONLY) { /* Open existing for write */
217 if (bfd->use_backup_api) {
219 dwaccess = GENERIC_WRITE|/*FILE_ALL_ACCESS|*/WRITE_OWNER|WRITE_DAC/*|ACCESS_SYSTEM_SECURITY*/;
221 dwaccess = GENERIC_WRITE|FILE_ALL_ACCESS|WRITE_OWNER|WRITE_DAC|ACCESS_SYSTEM_SECURITY;
223 dwflags = FILE_FLAG_BACKUP_SEMANTICS;
225 dwaccess = GENERIC_WRITE;
228 bfd->fh = CreateFile(win32_fname,
229 dwaccess, /* Requested access */
231 NULL, /* SecurityAttributes */
232 OPEN_EXISTING, /* CreationDisposition */
233 dwflags, /* Flags and attributes */
234 NULL); /* TemplateFile */
235 bfd->mode = BF_WRITE;
238 if (bfd->use_backup_api) {
239 dwaccess = GENERIC_READ|READ_CONTROL|ACCESS_SYSTEM_SECURITY;
240 dwflags = FILE_FLAG_BACKUP_SEMANTICS;
242 dwaccess = GENERIC_READ;
245 bfd->fh = CreateFile(win32_fname,
246 dwaccess, /* Requested access */
247 FILE_SHARE_READ, /* Shared mode */
248 NULL, /* SecurityAttributes */
249 OPEN_EXISTING, /* CreationDisposition */
250 dwflags, /* Flags and attributes */
251 NULL); /* TemplateFile */
255 if (bfd->fh == INVALID_HANDLE_VALUE) {
256 bfd->lerror = GetLastError();
257 bfd->berrno = b_errno_win32;
258 bfd->mode = BF_CLOSED;
261 bfd->lpContext = NULL;
262 free_pool_memory(win32_fname);
263 return bfd->mode == BF_CLOSED ? -1 : 1;
267 * Returns 0 on success
270 int bclose(BFILE *bfd)
275 free_pool_memory(bfd->errmsg);
278 if (bfd->mode == BF_CLOSED) {
281 if (bfd->use_backup_api && bfd->mode == BF_READ) {
283 if (!bfd->lpContext && !p_BackupRead(bfd->fh,
285 (DWORD)0, /* bytes to read */
286 &bfd->rw_bytes, /* bytes read */
288 1, /* ProcessSecurity */
289 &bfd->lpContext)) { /* Read context */
292 } else if (bfd->use_backup_api && bfd->mode == BF_WRITE) {
294 if (!bfd->lpContext && !p_BackupWrite(bfd->fh,
296 (DWORD)0, /* bytes to read */
297 &bfd->rw_bytes, /* bytes written */
299 1, /* ProcessSecurity */
300 &bfd->lpContext)) { /* Write context */
304 if (!CloseHandle(bfd->fh)) {
307 bfd->mode = BF_CLOSED;
308 bfd->lpContext = NULL;
313 * Generate error message
315 char *berror(BFILE *bfd)
319 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|
320 FORMAT_MESSAGE_FROM_SYSTEM,
327 strip_trailing_junk(msg);
329 bfd->errmsg = get_pool_memory(PM_FNAME);
331 pm_strcpy(&bfd->errmsg, msg);
336 /* Returns: bytes read on success
340 ssize_t bread(BFILE *bfd, void *buf, size_t count)
344 if (bfd->use_backup_api) {
345 if (!p_BackupRead(bfd->fh,
350 1, /* Process Security */
351 &bfd->lpContext)) { /* Context */
352 bfd->lerror = GetLastError();
353 bfd->berrno = b_errno_win32;
357 if (!ReadFile(bfd->fh,
362 bfd->lerror = GetLastError();
363 bfd->berrno = b_errno_win32;
368 return (ssize_t)bfd->rw_bytes;
371 ssize_t bwrite(BFILE *bfd, void *buf, size_t count)
375 if (bfd->use_backup_api) {
376 if (!p_BackupWrite(bfd->fh,
381 1, /* Process Security */
382 &bfd->lpContext)) { /* Context */
383 bfd->lerror = GetLastError();
384 bfd->berrno = b_errno_win32;
388 if (!WriteFile(bfd->fh,
393 bfd->lerror = GetLastError();
394 bfd->berrno = b_errno_win32;
398 return (ssize_t)bfd->rw_bytes;
401 int is_bopen(BFILE *bfd)
403 return bfd->mode != BF_CLOSED;
406 off_t blseek(BFILE *bfd, off_t offset, int whence)
408 /* ****FIXME**** this is needed if we want to read Win32 Archives */
412 #else /* Unix systems */
414 /* ===============================================================
418 * ===============================================================
420 void binit(BFILE *bfd)
422 memset(bfd, 0, sizeof(BFILE));
428 return 0; /* no can do */
432 * Enables using the Backup API (win32_data).
433 * Returns 1 if function worked
434 * Returns 0 if failed (i.e. do not have Backup API on this machine)
436 int set_win32_backup(BFILE *bfd)
438 return 0; /* no can do */
442 int set_portable_backup(BFILE *bfd)
444 return 1; /* no problem */
448 * Return 1 if we are writing in portable format
451 int is_portable_backup(BFILE *bfd)
453 return 1; /* portable by definition */
456 int is_stream_supported(int stream)
458 /* No Win32 backup on this machine */
461 case STREAM_GZIP_DATA:
462 case STREAM_SPARSE_GZIP_DATA:
464 case STREAM_WIN32_DATA:
465 case STREAM_WIN32_GZIP_DATA:
470 case STREAM_GZIP_DATA:
471 case STREAM_SPARSE_GZIP_DATA:
473 case STREAM_UNIX_ATTRIBUTES:
474 case STREAM_FILE_DATA:
475 case STREAM_MD5_SIGNATURE:
476 case STREAM_UNIX_ATTRIBUTES_EX:
477 case STREAM_SPARSE_DATA:
478 case STREAM_PROGRAM_NAMES:
479 case STREAM_PROGRAM_DATA:
480 case STREAM_SHA1_SIGNATURE:
481 case 0: /* compatibility with old tapes */
488 int bopen(BFILE *bfd, const char *fname, int flags, mode_t mode)
490 bfd->fid = open(fname, flags, mode);
492 Dmsg1(400, "Open file %d\n", bfd->fid);
496 int bclose(BFILE *bfd)
499 Dmsg1(400, "Close file %d\n", bfd->fid);
500 if (bfd->fid == -1) {
503 stat = close(bfd->fid);
510 ssize_t bread(BFILE *bfd, void *buf, size_t count)
513 stat = read(bfd->fid, buf, count);
518 ssize_t bwrite(BFILE *bfd, void *buf, size_t count)
521 stat = write(bfd->fid, buf, count);
526 int is_bopen(BFILE *bfd)
528 return bfd->fid >= 0;
531 off_t blseek(BFILE *bfd, off_t offset, int whence)
534 pos = lseek(bfd->fid, offset, whence);
539 char *berror(BFILE *bfd)
541 return strerror(bfd->berrno);