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;
114 * Enables using the Backup API (win32_data).
115 * Returns 1 if function worked
116 * Returns 0 if failed (i.e. do not have Backup API on this machine)
118 int set_win32_backup(BFILE *bfd)
120 /* We enable if possible here */
121 bfd->use_backup_api = have_win32_api();
122 return bfd->use_backup_api;
126 int set_portable_backup(BFILE *bfd)
128 bfd->use_backup_api = 0;
133 * Return 1 if we are NOT using Win32 BackupWrite()
136 int is_portable_backup(BFILE *bfd)
138 return !bfd->use_backup_api;
143 return p_BackupRead && p_BackupWrite;
149 * Return 1 if we support the stream
150 * 0 if we do not support the stream
152 int is_stream_supported(int stream)
154 /* No Win32 backup on this machine */
157 case STREAM_GZIP_DATA:
158 case STREAM_SPARSE_GZIP_DATA:
161 case STREAM_WIN32_DATA:
162 case STREAM_WIN32_GZIP_DATA:
163 return have_win32_api();
167 case STREAM_GZIP_DATA:
168 case STREAM_SPARSE_GZIP_DATA:
170 case STREAM_UNIX_ATTRIBUTES:
171 case STREAM_FILE_DATA:
172 case STREAM_MD5_SIGNATURE:
173 case STREAM_UNIX_ATTRIBUTES_EX:
174 case STREAM_SPARSE_DATA:
175 case STREAM_PROGRAM_NAMES:
176 case STREAM_PROGRAM_DATA:
177 case STREAM_SHA1_SIGNATURE:
178 case 0: /* compatibility with old tapes */
184 HANDLE bget_handle(BFILE *bfd)
189 int bopen(BFILE *bfd, const char *fname, int flags, mode_t mode)
191 POOLMEM *win32_fname;
192 DWORD dwaccess, dwflags;
194 /* Convert to Windows path format */
195 win32_fname = get_pool_memory(PM_FNAME);
196 unix_name_to_win32(&win32_fname, (char *)fname);
198 if (flags & O_CREAT) { /* Create */
199 if (bfd->use_backup_api) {
200 dwaccess = GENERIC_WRITE|FILE_ALL_ACCESS|WRITE_OWNER|WRITE_DAC|ACCESS_SYSTEM_SECURITY;
201 dwflags = FILE_FLAG_BACKUP_SEMANTICS;
203 dwaccess = GENERIC_WRITE;
206 bfd->fh = CreateFile(win32_fname,
207 dwaccess, /* Requested access */
209 NULL, /* SecurityAttributes */
210 CREATE_ALWAYS, /* CreationDisposition */
211 dwflags, /* Flags and attributes */
212 NULL); /* TemplateFile */
213 bfd->mode = BF_WRITE;
215 } else if (flags & O_WRONLY) { /* Open existing for write */
216 if (bfd->use_backup_api) {
218 dwaccess = GENERIC_WRITE|/*FILE_ALL_ACCESS|*/WRITE_OWNER|WRITE_DAC/*|ACCESS_SYSTEM_SECURITY*/;
220 dwaccess = GENERIC_WRITE|FILE_ALL_ACCESS|WRITE_OWNER|WRITE_DAC|ACCESS_SYSTEM_SECURITY;
222 dwflags = FILE_FLAG_BACKUP_SEMANTICS;
224 dwaccess = GENERIC_WRITE;
227 bfd->fh = CreateFile(win32_fname,
228 dwaccess, /* Requested access */
230 NULL, /* SecurityAttributes */
231 OPEN_EXISTING, /* CreationDisposition */
232 dwflags, /* Flags and attributes */
233 NULL); /* TemplateFile */
234 bfd->mode = BF_WRITE;
237 if (bfd->use_backup_api) {
238 dwaccess = GENERIC_READ|READ_CONTROL|ACCESS_SYSTEM_SECURITY;
239 dwflags = FILE_FLAG_BACKUP_SEMANTICS;
241 dwaccess = GENERIC_READ;
244 bfd->fh = CreateFile(win32_fname,
245 dwaccess, /* Requested access */
246 FILE_SHARE_READ, /* Shared mode */
247 NULL, /* SecurityAttributes */
248 OPEN_EXISTING, /* CreationDisposition */
249 dwflags, /* Flags and attributes */
250 NULL); /* TemplateFile */
254 if (bfd->fh == INVALID_HANDLE_VALUE) {
255 bfd->lerror = GetLastError();
256 bfd->mode = BF_CLOSED;
259 bfd->lpContext = NULL;
260 free_pool_memory(win32_fname);
261 return bfd->mode == BF_CLOSED ? -1 : 1;
265 * Returns 0 on success
268 int bclose(BFILE *bfd)
273 free_pool_memory(bfd->errmsg);
276 if (bfd->mode == BF_CLOSED) {
279 if (bfd->use_backup_api && bfd->mode == BF_READ) {
281 if (!bfd->lpContext && !p_BackupRead(bfd->fh,
283 (DWORD)0, /* bytes to read */
284 &bfd->rw_bytes, /* bytes read */
286 1, /* ProcessSecurity */
287 &bfd->lpContext)) { /* Read context */
290 } else if (bfd->use_backup_api && bfd->mode == BF_WRITE) {
292 if (!bfd->lpContext && !p_BackupWrite(bfd->fh,
294 (DWORD)0, /* bytes to read */
295 &bfd->rw_bytes, /* bytes written */
297 1, /* ProcessSecurity */
298 &bfd->lpContext)) { /* Write context */
302 if (!CloseHandle(bfd->fh)) {
305 bfd->mode = BF_CLOSED;
306 bfd->lpContext = NULL;
311 * Generate error message
313 char *berror(BFILE *bfd)
317 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|
318 FORMAT_MESSAGE_FROM_SYSTEM,
325 strip_trailing_junk(msg);
327 bfd->errmsg = get_pool_memory(PM_FNAME);
329 pm_strcpy(&bfd->errmsg, msg);
334 /* Returns: bytes read on success
338 ssize_t bread(BFILE *bfd, void *buf, size_t count)
342 if (bfd->use_backup_api) {
343 if (!p_BackupRead(bfd->fh,
348 1, /* Process Security */
349 &bfd->lpContext)) { /* Context */
350 bfd->lerror = GetLastError();
354 if (!ReadFile(bfd->fh,
359 bfd->lerror = GetLastError();
364 return (ssize_t)bfd->rw_bytes;
367 ssize_t bwrite(BFILE *bfd, void *buf, size_t count)
371 if (bfd->use_backup_api) {
372 if (!p_BackupWrite(bfd->fh,
377 1, /* Process Security */
378 &bfd->lpContext)) { /* Context */
379 bfd->lerror = GetLastError();
383 if (!WriteFile(bfd->fh,
388 bfd->lerror = GetLastError();
392 return (ssize_t)bfd->rw_bytes;
395 int is_bopen(BFILE *bfd)
397 return bfd->mode != BF_CLOSED;
400 off_t blseek(BFILE *bfd, off_t offset, int whence)
402 /* ****FIXME**** this is needed if we want to read Win32 Archives */
406 #else /* Unix systems */
408 /* ===============================================================
412 * ===============================================================
414 void binit(BFILE *bfd)
416 memset(bfd, 0, sizeof(BFILE));
422 return 0; /* no can do */
426 * Enables using the Backup API (win32_data).
427 * Returns 1 if function worked
428 * Returns 0 if failed (i.e. do not have Backup API on this machine)
430 int set_win32_backup(BFILE *bfd)
432 return 0; /* no can do */
436 int set_portable_backup(BFILE *bfd)
438 return 1; /* no problem */
442 * Return 1 if we are writing in portable format
445 int is_portable_backup(BFILE *bfd)
447 return 1; /* portable by definition */
450 int is_stream_supported(int stream)
452 /* No Win32 backup on this machine */
455 case STREAM_GZIP_DATA:
456 case STREAM_SPARSE_GZIP_DATA:
458 case STREAM_WIN32_DATA:
459 case STREAM_WIN32_GZIP_DATA:
464 case STREAM_GZIP_DATA:
465 case STREAM_SPARSE_GZIP_DATA:
467 case STREAM_UNIX_ATTRIBUTES:
468 case STREAM_FILE_DATA:
469 case STREAM_MD5_SIGNATURE:
470 case STREAM_UNIX_ATTRIBUTES_EX:
471 case STREAM_SPARSE_DATA:
472 case STREAM_PROGRAM_NAMES:
473 case STREAM_PROGRAM_DATA:
474 case STREAM_SHA1_SIGNATURE:
475 case 0: /* compatibility with old tapes */
482 int bopen(BFILE *bfd, const char *fname, int flags, mode_t mode)
484 bfd->fid = open(fname, flags, mode);
486 Dmsg1(400, "Open file %d\n", bfd->fid);
490 int bclose(BFILE *bfd)
493 Dmsg1(400, "Close file %d\n", bfd->fid);
494 if (bfd->fid == -1) {
497 stat = close(bfd->fid);
504 ssize_t bread(BFILE *bfd, void *buf, size_t count)
507 stat = read(bfd->fid, buf, count);
512 ssize_t bwrite(BFILE *bfd, void *buf, size_t count)
515 stat = write(bfd->fid, buf, count);
520 int is_bopen(BFILE *bfd)
522 return bfd->fid >= 0;
525 off_t blseek(BFILE *bfd, off_t offset, int whence)
528 pos = lseek(bfd->fid, offset, whence);
533 char *berror(BFILE *bfd)
535 return strerror(bfd->berrno);