source: vendor/3.5.4/source3/modules/vfs_scannedonly.c

Last change on this file was 478, checked in by Silvan Scherrer, 15 years ago

Samba 3.5: vendor update to 3.5.4
File size: 30.5 KB
Line 
1/*
2 * scannedonly VFS module for Samba 3.5
3 *
4 * Copyright 2007,2008,2009 (C) Olivier Sessink
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, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 * ABOUT SCANNEDONLY
21 *
22 * scannedonly implements a 'filter' like vfs module that talks over a
23 * unix domain socket or over UDP to a anti-virus engine.
24 *
25 * files that are clean have a corresponding .scanned:{filename} file
26 * in the same directory. So why the .scanned: files? They take up
27 * only an inode, because they are 0 bytes. To test if the file is
28 * scanned only a stat() call on the filesystem is needed which is
29 * very quick compared to a database lookup. All modern filesystems
30 * use database technology such as balanced trees for lookups anyway.
31 * The number of inodes in modern filesystems is also not limiting
32 * anymore. The .scanned: files are also easy scriptable. You can
33 * remove them with a simple find command or create them with a
34 * simple touch command. Extended filesystem attributes have similar
35 * properties, but are not supported on all filesystems, so that
36 * would limit the usage of the module (and attributes are not as
37 * easily scriptable)
38 *
39 * files that are not clean are sent to the AV-engine. Only the
40 * filename is sent over the socket. The protocol is very simple:
41 * a newline separated list of filenames inside each datagram.
42 *
43 * a file AV-scan may be requested multiple times, the AV-engine
44 * should also check if the file has been scanned already. Requests
45 * can also be dropped by the AV-engine (and we thus don't need the
46 * reliability of TCP).
47 *
48 */
49
50#include "includes.h"
51
52#include "config.h"
53
54#define SENDBUFFERSIZE 1450
55
56#ifndef SUN_LEN
57#define SUN_LEN(sunp) ((size_t)((struct sockaddr_un *)0)->sun_path \
58 + strlen((sunp)->sun_path))
59#endif
60
61
62struct Tscannedonly {
63 int socket;
64 int domain_socket;
65 int portnum;
66 int scanning_message_len;
67 int recheck_time_open;
68 int recheck_tries_open;
69 int recheck_size_open;
70 int recheck_time_readdir;
71 int recheck_tries_readdir;
72 bool show_special_files;
73 bool rm_hidden_files_on_rmdir;
74 bool hide_nonscanned_files;
75 bool allow_nonscanned_files;
76 char *socketname;
77 char *scanhost;
78 char *scanning_message;
79 char *p_scanned; /* prefix for scanned files */
80 char *p_virus; /* prefix for virus containing files */
81 char *p_failed; /* prefix for failed to scan files */
82 char gsendbuffer[SENDBUFFERSIZE + 1];
83};
84
85#define STRUCTSCANO(var) ((struct Tscannedonly *)var)
86
87struct scannedonly_DIR {
88 char *base;
89 int notify_loop_done;
90 SMB_STRUCT_DIR *DIR;
91};
92#define SCANNEDONLY_DEBUG 9
93/*********************/
94/* utility functions */
95/*********************/
96
97static char *real_path_from_notify_path(TALLOC_CTX *ctx,
98 struct Tscannedonly *so,
99 const char *path)
100{
101 char *name;
102 int len, pathlen;
103
104 name = strrchr(path, '/');
105 if (!name) {
106 return NULL;
107 }
108 pathlen = name - path;
109 name++;
110 len = strlen(name);
111 if (len <= so->scanning_message_len) {
112 return NULL;
113 }
114
115 if (strcmp(name + (len - so->scanning_message_len),
116 so->scanning_message) != 0) {
117 return NULL;
118 }
119
120 return talloc_strndup(ctx,path,
121 pathlen + len - so->scanning_message_len);
122}
123
124static char *cachefile_name(TALLOC_CTX *ctx,
125 const char *shortname,
126 const char *base,
127 const char *p_scanned)
128{
129 return talloc_asprintf(ctx, "%s%s%s", base, p_scanned, shortname);
130}
131
132static char *name_w_ending_slash(TALLOC_CTX *ctx, const char *name)
133{
134 int len = strlen(name);
135 if (name[len - 1] == '/') {
136 return talloc_strdup(ctx,name);
137 } else {
138 return talloc_asprintf(ctx, "%s/", name);
139 }
140}
141
142static char *cachefile_name_f_fullpath(TALLOC_CTX *ctx,
143 const char *fullpath,
144 const char *p_scanned)
145{
146 const char *base;
147 char *tmp, *cachefile, *shortname;
148 tmp = strrchr(fullpath, '/');
149 if (tmp) {
150 base = talloc_strndup(ctx, fullpath, (tmp - fullpath) + 1);
151 shortname = tmp + 1;
152 } else {
153 base = "";
154 shortname = (char *)fullpath;
155 }
156 cachefile = cachefile_name(ctx, shortname, base, p_scanned);
157 DEBUG(SCANNEDONLY_DEBUG,
158 ("cachefile_name_f_fullpath cachefile=%s\n", cachefile));
159 return cachefile;
160}
161
162static char *construct_full_path(TALLOC_CTX *ctx, vfs_handle_struct * handle,
163 const char *somepath, bool ending_slash)
164{
165 char *tmp;
166
167 if (!somepath) {
168 return NULL;
169 }
170 if (somepath[0] == '/') {
171 if (ending_slash) {
172 return name_w_ending_slash(ctx,somepath);
173 }
174 return talloc_strdup(ctx,somepath);
175 }
176 tmp=(char *)somepath;
177 if (tmp[0]=='.'&&tmp[1]=='/') {
178 tmp+=2;
179 }
180 /* vfs_GetWd() seems to return a path with a slash */
181 if (ending_slash) {
182 return talloc_asprintf(ctx, "%s/%s/",
183 vfs_GetWd(ctx, handle->conn),tmp);
184 }
185 return talloc_asprintf(ctx, "%s/%s",
186 vfs_GetWd(ctx, handle->conn),tmp);
187}
188
189static int connect_to_scanner(vfs_handle_struct * handle)
190{
191 struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
192
193 if (so->domain_socket) {
194 struct sockaddr_un saun;
195 DEBUG(SCANNEDONLY_DEBUG, ("socket=%s\n", so->socketname));
196 if ((so->socket = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
197 DEBUG(2, ("failed to create socket %s\n",
198 so->socketname));
199 return -1;
200 }
201 saun.sun_family = AF_UNIX;
202 strncpy(saun.sun_path, so->socketname,
203 sizeof(saun.sun_path) - 1);
204 if (connect(so->socket, (struct sockaddr *)(void *)&saun,
205 SUN_LEN(&saun)) < 0) {
206 DEBUG(2, ("failed to connect to socket %s\n",
207 so->socketname));
208 return -1;
209 }
210 DEBUG(SCANNEDONLY_DEBUG,("bound %s to socket %d\n",
211 saun.sun_path, so->socket));
212
213 } else {
214 so->socket = open_udp_socket(so->scanhost, so->portnum);
215 if (so->socket < 0) {
216 DEBUG(2,("failed to open UDP socket to %s:%d\n",
217 so->scanhost,so->portnum));
218 return -1;
219 }
220 }
221
222 {/* increasing the socket buffer is done because we have large bursts
223 of UDP packets or DGRAM's on a domain socket whenever we hit a
224 large directory with lots of unscanned files. */
225 int sndsize;
226 socklen_t size = sizeof(int);
227 getsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
228 (char *)&sndsize, &size);
229 DEBUG(SCANNEDONLY_DEBUG, ("current socket buffer size=%d\n",
230 sndsize));
231 sndsize = 262144;
232 if (setsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
233 (char *)&sndsize,
234 (int)sizeof(sndsize)) != 0) {
235 DEBUG(SCANNEDONLY_DEBUG,
236 ("error setting socket buffer %s (%d)\n",
237 strerror(errno), errno));
238 }
239 }
240 set_blocking(so->socket, false);
241 return 0;
242}
243
244static void flush_sendbuffer(vfs_handle_struct * handle)
245{
246 struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
247 int ret, len, loop = 10;
248 if (so->gsendbuffer[0] == '\0') {
249 return;
250 }
251
252 do {
253 loop--;
254 len = strlen(so->gsendbuffer);
255 ret = send(so->socket, so->gsendbuffer, len, 0);
256 if (ret == len) {
257 so->gsendbuffer[0] = '\0';
258 break;
259 }
260 if (ret == -1) {
261 DEBUG(3,("scannedonly flush_sendbuffer: "
262 "error sending on socket %d to scanner:"
263 " %s (%d)\n",
264 so->socket, strerror(errno), errno));
265 if (errno == ECONNREFUSED || errno == ENOTCONN
266 || errno == ECONNRESET) {
267 if (connect_to_scanner(handle) == -1)
268 break; /* connecting fails, abort */
269 /* try again */
270 } else if (errno != EINTR) {
271 /* on EINTR we just try again, all remaining
272 other errors we log the error
273 and try again ONCE */
274 loop = 1;
275 DEBUG(3,("scannedonly flush_sendbuffer: "
276 "error sending data to scanner: %s "
277 "(%d)\n", strerror(errno), errno));
278 }
279 } else {
280 /* --> partial write: Resend all filenames that were
281 not or not completely written. a partial filename
282 written means the filename will not arrive correctly,
283 so resend it completely */
284 int pos = 0;
285 while (pos < len) {
286 char *tmp = strchr(so->gsendbuffer+pos, '\n');
287 if (tmp && tmp - so->gsendbuffer < ret)
288 pos = tmp - so->gsendbuffer + 1;
289 else
290 break;
291 }
292 memmove(so->gsendbuffer, so->gsendbuffer + pos,
293 SENDBUFFERSIZE - ret);
294 /* now try again */
295 }
296 } while (loop > 0);
297
298 if (so->gsendbuffer[0] != '\0') {
299 DEBUG(2,
300 ("scannedonly flush_sendbuffer: "
301 "failed to send files to AV scanner, "
302 "discarding files."));
303 so->gsendbuffer[0] = '\0';
304 }
305}
306
307static void notify_scanner(vfs_handle_struct * handle, const char *scanfile)
308{
309 char *tmp;
310 int tmplen, gsendlen;
311 struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
312 TALLOC_CTX *ctx=talloc_tos();
313 if (scanfile[0] != '/') {
314 tmp = construct_full_path(ctx,handle, scanfile, false);
315 } else {
316 tmp = (char *)scanfile;
317 }
318 tmplen = strlen(tmp);
319 gsendlen = strlen(so->gsendbuffer);
320 DEBUG(SCANNEDONLY_DEBUG,
321 ("scannedonly notify_scanner: tmp=%s, tmplen=%d, gsendlen=%d\n",
322 tmp, tmplen, gsendlen));
323 if (gsendlen + tmplen >= SENDBUFFERSIZE) {
324 flush_sendbuffer(handle);
325 }
326 strlcat(so->gsendbuffer, tmp, SENDBUFFERSIZE + 1);
327 strlcat(so->gsendbuffer, "\n", SENDBUFFERSIZE + 1);
328}
329
330static bool is_scannedonly_file(struct Tscannedonly *so, const char *shortname)
331{
332 if (shortname[0]!='.') {
333 return false;
334 }
335 if (strncmp(shortname, so->p_scanned, strlen(so->p_scanned)) == 0) {
336 return true;
337 }
338 if (strncmp(shortname, so->p_virus, strlen(so->p_virus)) == 0) {
339 return true;
340 }
341 if (strncmp(shortname, so->p_failed, strlen(so->p_failed)) == 0) {
342 return true;
343 }
344 return false;
345}
346
347static bool timespec_is_newer(struct timespec *base, struct timespec *test)
348{
349 return timespec_compare(base,test) < 0;
350}
351
352/*
353vfs_handle_struct *handle the scannedonly handle
354scannedonly_DIR * sDIR the scannedonly struct if called from _readdir()
355or NULL
356fullpath is a full path starting from / or a relative path to the
357current working directory
358shortname is the filename without directory components
359basename, is the directory without file name component
360allow_nonexistant return TRUE if stat() on the requested file fails
361recheck_time, the time in milliseconds to wait for the daemon to
362create a .scanned file
363recheck_tries, the number of tries to wait
364recheck_size, size in Kb of files that should not be waited for
365loop : boolean if we should try to loop over all files in the directory
366and send a notify to the scanner for all files that need scanning
367*/
368static bool scannedonly_allow_access(vfs_handle_struct * handle,
369 struct scannedonly_DIR *sDIR,
370 struct smb_filename *smb_fname,
371 const char *shortname,
372 const char *base_name,
373 int allow_nonexistant,
374 int recheck_time, int recheck_tries,
375 int recheck_size, int loop)
376{
377 struct smb_filename *cache_smb_fname;
378 TALLOC_CTX *ctx=talloc_tos();
379 char *cachefile;
380 int retval;
381 int didloop;
382 DEBUG(SCANNEDONLY_DEBUG,
383 ("smb_fname->base_name=%s, shortname=%s, base_name=%s\n"
384 ,smb_fname->base_name,shortname,base_name));
385
386 if (ISDOT(shortname) || ISDOTDOT(shortname)) {
387 return true;
388 }
389 if (is_scannedonly_file(STRUCTSCANO(handle->data), shortname)) {
390 DEBUG(SCANNEDONLY_DEBUG,
391 ("scannedonly_allow_access, %s is a scannedonly file, "
392 "return 0\n", shortname));
393 return false;
394 }
395
396 if (!VALID_STAT(smb_fname->st)) {
397 DEBUG(SCANNEDONLY_DEBUG,("stat %s\n",smb_fname->base_name));
398 retval = SMB_VFS_NEXT_STAT(handle, smb_fname);
399 if (retval != 0) {
400 /* failed to stat this file?!? --> hide it */
401 DEBUG(SCANNEDONLY_DEBUG,("no valid stat, return"
402 " allow_nonexistant=%d\n",
403 allow_nonexistant));
404 return allow_nonexistant;
405 }
406 }
407 if (!S_ISREG(smb_fname->st.st_ex_mode)) {
408 DEBUG(SCANNEDONLY_DEBUG,
409 ("%s is not a regular file, ISDIR=%d\n",
410 smb_fname->base_name,
411 S_ISDIR(smb_fname->st.st_ex_mode)));
412 return (STRUCTSCANO(handle->data)->
413 show_special_files ||
414 S_ISDIR(smb_fname->st.st_ex_mode));
415 }
416 if (smb_fname->st.st_ex_size == 0) {
417 DEBUG(SCANNEDONLY_DEBUG,("empty file, return 1\n"));
418 return true; /* empty files cannot contain viruses ! */
419 }
420 cachefile = cachefile_name(ctx,
421 shortname,
422 base_name,
423 STRUCTSCANO(handle->data)->p_scanned);
424 create_synthetic_smb_fname(ctx, cachefile,NULL,NULL,&cache_smb_fname);
425 if (!VALID_STAT(cache_smb_fname->st)) {
426 retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
427 }
428 if (retval == 0 && VALID_STAT(cache_smb_fname->st)) {
429 if (timespec_is_newer(&smb_fname->st.st_ex_mtime,
430 &cache_smb_fname->st.st_ex_mtime)) {
431 talloc_free(cache_smb_fname);
432 return true;
433 }
434 /* no cachefile or too old */
435 SMB_VFS_NEXT_UNLINK(handle, cache_smb_fname);
436 retval = -1;
437 }
438
439 notify_scanner(handle, smb_fname->base_name);
440
441 didloop = 0;
442 if (loop && sDIR && !sDIR->notify_loop_done) {
443 /* check the rest of the directory and notify the
444 scanner if some file needs scanning */
445 long offset;
446 SMB_STRUCT_DIRENT *dire;
447
448 offset = SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
449 dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, NULL);
450 while (dire) {
451 char *fpath2;
452 struct smb_filename *smb_fname2;
453 fpath2 = talloc_asprintf(ctx, "%s%s", base_name,dire->d_name);
454 DEBUG(SCANNEDONLY_DEBUG,
455 ("scannedonly_allow_access in loop, "
456 "found %s\n", fpath2));
457 create_synthetic_smb_fname(ctx, fpath2,NULL,NULL,
458 &smb_fname2);
459 scannedonly_allow_access(handle, NULL,
460 smb_fname2,
461 dire->d_name,
462 base_name, 0, 0, 0, 0, 0);
463 talloc_free(fpath2);
464 talloc_free(smb_fname2);
465 dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR,NULL);
466 }
467 sDIR->notify_loop_done = 1;
468 didloop = 1;
469 SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
470 }
471 if (recheck_time > 0
472 && ((recheck_size > 0
473 && smb_fname->st.st_ex_size < (1024 * recheck_size))
474 || didloop)) {
475 int i = 0;
476 flush_sendbuffer(handle);
477 while (retval != 0 /*&& errno == ENOENT */
478 && i < recheck_tries) {
479 struct timespec req = { 0, recheck_time * 10000 };
480 DEBUG(SCANNEDONLY_DEBUG,
481 ("scannedonly_allow_access, wait (try=%d "
482 "(max %d), %d ms) for %s\n",
483 i, recheck_tries,
484 recheck_time, cache_smb_fname->base_name));
485 nanosleep(&req, NULL);
486 retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
487 i++;
488 }
489 }
490 /* still no cachefile, or still too old, return 0 */
491 if (retval != 0
492 || !timespec_is_newer(&smb_fname->st.st_ex_mtime,
493 &cache_smb_fname->st.st_ex_mtime)) {
494 DEBUG(SCANNEDONLY_DEBUG,
495 ("retval=%d, return 0\n",retval));
496 return false;
497 }
498 return true;
499}
500
501/*********************/
502/* VFS functions */
503/*********************/
504
505static SMB_STRUCT_DIR *scannedonly_opendir(vfs_handle_struct * handle,
506 const char *fname,
507 const char *mask, uint32 attr)
508{
509 SMB_STRUCT_DIR *DIRp;
510 struct scannedonly_DIR *sDIR;
511
512 DIRp = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
513 if (!DIRp) {
514 return NULL;
515 }
516
517 sDIR = TALLOC_P(NULL, struct scannedonly_DIR);
518 if (fname[0] != '/') {
519 sDIR->base = construct_full_path(sDIR,handle, fname, true);
520 } else {
521 sDIR->base = name_w_ending_slash(sDIR, fname);
522 }
523 DEBUG(SCANNEDONLY_DEBUG,
524 ("scannedonly_opendir, fname=%s, base=%s\n",fname,sDIR->base));
525 sDIR->DIR = DIRp;
526 sDIR->notify_loop_done = 0;
527 return (SMB_STRUCT_DIR *) sDIR;
528}
529
530static SMB_STRUCT_DIRENT *scannedonly_readdir(vfs_handle_struct *handle,
531 SMB_STRUCT_DIR * dirp,
532 SMB_STRUCT_STAT *sbuf)
533{
534 SMB_STRUCT_DIRENT *result;
535 int allowed = 0;
536 char *tmp;
537 struct smb_filename *smb_fname;
538 char *notify_name;
539 int namelen;
540 SMB_STRUCT_DIRENT *newdirent;
541 TALLOC_CTX *ctx=talloc_tos();
542
543 struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
544 if (!dirp) {
545 return NULL;
546 }
547
548 result = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, sbuf);
549
550 if (!result)
551 return NULL;
552
553 if (is_scannedonly_file(STRUCTSCANO(handle->data), result->d_name)) {
554 DEBUG(SCANNEDONLY_DEBUG,
555 ("scannedonly_readdir, %s is a scannedonly file, "
556 "skip to next entry\n", result->d_name));
557 return scannedonly_readdir(handle, dirp, NULL);
558 }
559 tmp = talloc_asprintf(ctx, "%s%s", sDIR->base, result->d_name);
560 DEBUG(SCANNEDONLY_DEBUG,
561 ("scannedonly_readdir, check access to %s (sbuf=%p)\n",
562 tmp,sbuf));
563
564 /* even if we don't hide nonscanned files or we allow non scanned
565 files we call allow_access because it will notify the daemon to
566 scan these files */
567 create_synthetic_smb_fname(ctx, tmp,NULL,
568 sbuf?VALID_STAT(*sbuf)?sbuf:NULL:NULL,
569 &smb_fname);
570 allowed = scannedonly_allow_access(
571 handle, sDIR, smb_fname,
572 result->d_name,
573 sDIR->base, 0,
574 STRUCTSCANO(handle->data)->hide_nonscanned_files
575 ? STRUCTSCANO(handle->data)->recheck_time_readdir
576 : 0,
577 STRUCTSCANO(handle->data)->recheck_tries_readdir,
578 -1,
579 1);
580 DEBUG(SCANNEDONLY_DEBUG,
581 ("scannedonly_readdir access to %s (%s) = %d\n", tmp,
582 result->d_name, allowed));
583 if (allowed) {
584 return result;
585 }
586 DEBUG(SCANNEDONLY_DEBUG,
587 ("hide_nonscanned_files=%d, allow_nonscanned_files=%d\n",
588 STRUCTSCANO(handle->data)->hide_nonscanned_files,
589 STRUCTSCANO(handle->data)->allow_nonscanned_files
590 ));
591
592 if (!STRUCTSCANO(handle->data)->hide_nonscanned_files
593 || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
594 return result;
595 }
596
597 DEBUG(SCANNEDONLY_DEBUG,
598 ("scannedonly_readdir, readdir listing for %s not "
599 "allowed, notify user\n", result->d_name));
600 notify_name = talloc_asprintf(
601 ctx,"%s %s",result->d_name,
602 STRUCTSCANO(handle->data)->scanning_message);
603 namelen = strlen(notify_name);
604 newdirent = (SMB_STRUCT_DIRENT *)TALLOC_ARRAY(
605 ctx, char, sizeof(SMB_STRUCT_DIRENT) + namelen + 1);
606 if (!newdirent) {
607 return NULL;
608 }
609 memcpy(newdirent, result, sizeof(SMB_STRUCT_DIRENT));
610 memcpy(&newdirent->d_name, notify_name, namelen + 1);
611 DEBUG(SCANNEDONLY_DEBUG,
612 ("scannedonly_readdir, return newdirent at %p with "
613 "notification %s\n", newdirent, newdirent->d_name));
614 return newdirent;
615}
616
617static void scannedonly_seekdir(struct vfs_handle_struct *handle,
618 SMB_STRUCT_DIR * dirp, long offset)
619{
620 struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
621 SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
622}
623
624static long scannedonly_telldir(struct vfs_handle_struct *handle,
625 SMB_STRUCT_DIR * dirp)
626{
627 struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
628 return SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
629}
630
631static void scannedonly_rewinddir(struct vfs_handle_struct *handle,
632 SMB_STRUCT_DIR * dirp)
633{
634 struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
635 SMB_VFS_NEXT_REWINDDIR(handle, sDIR->DIR);
636}
637
638static int scannedonly_closedir(vfs_handle_struct * handle,
639 SMB_STRUCT_DIR * dirp)
640{
641 int retval;
642 struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
643 flush_sendbuffer(handle);
644 retval = SMB_VFS_NEXT_CLOSEDIR(handle, sDIR->DIR);
645 TALLOC_FREE(sDIR);
646 return retval;
647}
648
649static int scannedonly_stat(vfs_handle_struct * handle,
650 struct smb_filename *smb_fname)
651{
652 int ret;
653 ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
654 DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_stat: %s returned %d\n",
655 smb_fname->base_name, ret));
656 if (ret != 0 && errno == ENOENT) {
657 TALLOC_CTX *ctx=talloc_tos();
658 char *test_base_name, *tmp_base_name = smb_fname->base_name;
659 /* possibly this was a fake name (file is being scanned for
660 viruses.txt): check for that and create the real name and
661 stat the real name */
662 test_base_name = real_path_from_notify_path(
663 ctx,
664 STRUCTSCANO(handle->data),
665 smb_fname->base_name);
666 if (test_base_name) {
667 smb_fname->base_name = test_base_name;
668 ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
669 DEBUG(5, ("_stat: %s returned %d\n",
670 test_base_name, ret));
671 smb_fname->base_name = tmp_base_name;
672 }
673 }
674 return ret;
675}
676
677static int scannedonly_lstat(vfs_handle_struct * handle,
678 struct smb_filename *smb_fname)
679{
680 int ret;
681 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
682 DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_lstat: %s returned %d\n",
683 smb_fname->base_name, ret));
684 if (ret != 0 && errno == ENOENT) {
685 TALLOC_CTX *ctx=talloc_tos();
686 char *test_base_name, *tmp_base_name = smb_fname->base_name;
687 /* possibly this was a fake name (file is being scanned for
688 viruses.txt): check for that and create the real name and
689 stat the real name */
690 test_base_name = real_path_from_notify_path(
691 ctx, STRUCTSCANO(handle->data), smb_fname->base_name);
692 if (test_base_name) {
693 smb_fname->base_name = test_base_name;
694 ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
695 DEBUG(5, ("_lstat: %s returned %d\n",
696 test_base_name, ret));
697 smb_fname->base_name = tmp_base_name;
698 }
699 }
700 return ret;
701}
702
703static int scannedonly_open(vfs_handle_struct * handle,
704 struct smb_filename *smb_fname,
705 files_struct * fsp, int flags, mode_t mode)
706{
707 const char *base;
708 char *tmp, *shortname;
709 int allowed, write_access = 0;
710 TALLOC_CTX *ctx=talloc_tos();
711 /* if open for writing ignore it */
712 if ((flags & O_ACCMODE) == O_WRONLY) {
713 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
714 }
715 if ((flags & O_ACCMODE) == O_RDWR) {
716 write_access = 1;
717 }
718 /* check if this file is scanned already */
719 tmp = strrchr(smb_fname->base_name, '/');
720 if (tmp) {
721 base = talloc_strndup(ctx,smb_fname->base_name,
722 (tmp - smb_fname->base_name) + 1);
723 shortname = tmp + 1;
724 } else {
725 base = "";
726 shortname = (char *)smb_fname->base_name;
727 }
728 allowed = scannedonly_allow_access(
729 handle, NULL, smb_fname, shortname,
730 base,
731 write_access,
732 STRUCTSCANO(handle->data)->recheck_time_open,
733 STRUCTSCANO(handle->data)->recheck_tries_open,
734 STRUCTSCANO(handle->data)->recheck_size_open,
735 0);
736 flush_sendbuffer(handle);
737 DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_open: allow=%d for %s\n",
738 allowed, smb_fname->base_name));
739 if (allowed
740 || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
741 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
742 }
743 errno = EACCES;
744 return -1;
745}
746
747static int scannedonly_close(vfs_handle_struct * handle, files_struct * fsp)
748{
749 /* we only have to notify the scanner
750 for files that were open readwrite or writable. */
751 if (fsp->can_write) {
752 TALLOC_CTX *ctx = talloc_tos();
753 notify_scanner(handle, construct_full_path(
754 ctx,handle,
755 fsp->fsp_name->base_name,false));
756 flush_sendbuffer(handle);
757 }
758 return SMB_VFS_NEXT_CLOSE(handle, fsp);
759}
760
761static int scannedonly_rename(vfs_handle_struct * handle,
762 const struct smb_filename *smb_fname_src,
763 const struct smb_filename *smb_fname_dst)
764{
765 /* rename the cache file before we pass the actual rename on */
766 struct smb_filename *smb_fname_src_tmp = NULL;
767 struct smb_filename *smb_fname_dst_tmp = NULL;
768 char *cachefile_src, *cachefile_dst;
769 TALLOC_CTX *ctx = talloc_tos();
770
771 /* Setup temporary smb_filename structs. */
772 cachefile_src = cachefile_name_f_fullpath(
773 ctx,
774 smb_fname_src->base_name,
775 STRUCTSCANO(handle->data)->p_scanned);
776 cachefile_dst = cachefile_name_f_fullpath(
777 ctx,
778 smb_fname_dst->base_name,
779 STRUCTSCANO(handle->data)->p_scanned);
780
781 create_synthetic_smb_fname(ctx, cachefile_src,NULL,NULL,
782 &smb_fname_src_tmp);
783 create_synthetic_smb_fname(ctx, cachefile_dst,NULL,NULL,
784 &smb_fname_dst_tmp);
785
786 if (SMB_VFS_NEXT_RENAME(handle, smb_fname_src_tmp, smb_fname_dst_tmp)
787 != 0) {
788 DEBUG(SCANNEDONLY_DEBUG,
789 ("failed to rename %s into %s\n", cachefile_src,
790 cachefile_dst));
791 }
792 return SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
793}
794
795static int scannedonly_unlink(vfs_handle_struct * handle,
796 const struct smb_filename *smb_fname)
797{
798 /* unlink the 'scanned' file too */
799 struct smb_filename *smb_fname_cache = NULL;
800 char * cachefile;
801 TALLOC_CTX *ctx = talloc_tos();
802
803 cachefile = cachefile_name_f_fullpath(
804 ctx,
805 smb_fname->base_name,
806 STRUCTSCANO(handle->data)->p_scanned);
807 create_synthetic_smb_fname(ctx, cachefile,NULL,NULL,
808 &smb_fname_cache);
809 if (SMB_VFS_NEXT_UNLINK(handle, smb_fname_cache) != 0) {
810 DEBUG(SCANNEDONLY_DEBUG, ("_unlink: failed to unlink %s\n",
811 smb_fname_cache->base_name));
812 }
813 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
814}
815
816static int scannedonly_rmdir(vfs_handle_struct * handle, const char *path)
817{
818 /* if there are only .scanned: .virus: or .failed: files, we delete
819 those, because the client cannot see them */
820 DIR *dirp;
821 SMB_STRUCT_DIRENT *dire;
822 TALLOC_CTX *ctx = talloc_tos();
823 bool only_deletable_files = true, have_files = false;
824 char *path_w_slash;
825
826 if (!STRUCTSCANO(handle->data)->rm_hidden_files_on_rmdir)
827 return SMB_VFS_NEXT_RMDIR(handle, path);
828
829 path_w_slash = name_w_ending_slash(ctx,path);
830 dirp = SMB_VFS_NEXT_OPENDIR(handle, path, NULL, 0);
831 if (!dirp) {
832 return -1;
833 }
834 while ((dire = SMB_VFS_NEXT_READDIR(handle, dirp, NULL)) != NULL) {
835 if (ISDOT(dire->d_name) || ISDOTDOT(dire->d_name)) {
836 continue;
837 }
838 have_files = true;
839 if (!is_scannedonly_file(STRUCTSCANO(handle->data),
840 dire->d_name)) {
841 struct smb_filename *smb_fname = NULL;
842 char *fullpath;
843 int retval;
844
845 if (STRUCTSCANO(handle->data)->show_special_files) {
846 only_deletable_files = false;
847 break;
848 }
849 /* stat the file and see if it is a
850 special file */
851 fullpath = talloc_asprintf(ctx, "%s%s", path_w_slash,
852 dire->d_name);
853 create_synthetic_smb_fname(ctx, fullpath,NULL,NULL,
854 &smb_fname);
855 retval = SMB_VFS_NEXT_STAT(handle, smb_fname);
856 if (retval == 0
857 && S_ISREG(smb_fname->st.st_ex_mode)) {
858 only_deletable_files = false;
859 }
860 TALLOC_FREE(fullpath);
861 TALLOC_FREE(smb_fname);
862 break;
863 }
864 }
865 DEBUG(SCANNEDONLY_DEBUG,
866 ("path=%s, have_files=%d, only_deletable_files=%d\n",
867 path, have_files, only_deletable_files));
868 if (have_files && only_deletable_files) {
869 DEBUG(SCANNEDONLY_DEBUG,
870 ("scannedonly_rmdir, remove leftover scannedonly "
871 "files from %s\n", path_w_slash));
872 SMB_VFS_NEXT_REWINDDIR(handle, dirp);
873 while ((dire = SMB_VFS_NEXT_READDIR(handle, dirp, NULL))
874 != NULL) {
875 char *fullpath;
876 struct smb_filename *smb_fname = NULL;
877 if (ISDOT(dire->d_name) || ISDOTDOT(dire->d_name)) {
878 continue;
879 }
880 fullpath = talloc_asprintf(ctx, "%s%s", path_w_slash,
881 dire->d_name);
882 create_synthetic_smb_fname(ctx, fullpath,NULL,NULL,
883 &smb_fname);
884 DEBUG(SCANNEDONLY_DEBUG, ("unlink %s\n", fullpath));
885 SMB_VFS_NEXT_UNLINK(handle, smb_fname);
886 TALLOC_FREE(fullpath);
887 TALLOC_FREE(smb_fname);
888 }
889 }
890 SMB_VFS_NEXT_CLOSEDIR(handle, dirp);
891 return SMB_VFS_NEXT_RMDIR(handle, path);
892}
893
894static void free_scannedonly_data(void **data)
895{
896 SAFE_FREE(*data);
897}
898
899static int scannedonly_connect(struct vfs_handle_struct *handle,
900 const char *service, const char *user)
901{
902
903 struct Tscannedonly *so;
904
905 so = SMB_MALLOC_P(struct Tscannedonly);
906 handle->data = (void *)so;
907 handle->free_data = free_scannedonly_data;
908 so->gsendbuffer[0]='\0';
909 so->domain_socket =
910 lp_parm_bool(SNUM(handle->conn), "scannedonly",
911 "domain_socket", True);
912 so->socketname =
913 (char *)lp_parm_const_string(SNUM(handle->conn),
914 "scannedonly", "socketname",
915 "/var/lib/scannedonly/scan");
916 so->portnum =
917 lp_parm_int(SNUM(handle->conn), "scannedonly", "portnum",
918 2020);
919 so->scanhost =
920 (char *)lp_parm_const_string(SNUM(handle->conn),
921 "scannedonly", "scanhost",
922 "localhost");
923
924 so->show_special_files =
925 lp_parm_bool(SNUM(handle->conn), "scannedonly",
926 "show_special_files", True);
927 so->rm_hidden_files_on_rmdir =
928 lp_parm_bool(SNUM(handle->conn), "scannedonly",
929 "rm_hidden_files_on_rmdir", True);
930 so->hide_nonscanned_files =
931 lp_parm_bool(SNUM(handle->conn), "scannedonly",
932 "hide_nonscanned_files", False);
933 so->allow_nonscanned_files =
934 lp_parm_bool(SNUM(handle->conn), "scannedonly",
935 "allow_nonscanned_files", False);
936 so->scanning_message =
937 (char *)lp_parm_const_string(SNUM(handle->conn),
938 "scannedonly",
939 "scanning_message",
940 "is being scanned for viruses");
941 so->scanning_message_len = strlen(so->scanning_message);
942 so->recheck_time_open =
943 lp_parm_int(SNUM(handle->conn), "scannedonly",
944 "recheck_time_open", 50);
945 so->recheck_tries_open =
946 lp_parm_int(SNUM(handle->conn), "scannedonly",
947 "recheck_tries_open", 100);
948 so->recheck_size_open =
949 lp_parm_int(SNUM(handle->conn), "scannedonly",
950 "recheck_size_open", 100);
951 so->recheck_time_readdir =
952 lp_parm_int(SNUM(handle->conn), "scannedonly",
953 "recheck_time_readdir", 50);
954 so->recheck_tries_readdir =
955 lp_parm_int(SNUM(handle->conn), "scannedonly",
956 "recheck_tries_readdir", 20);
957
958 so->p_scanned =
959 (char *)lp_parm_const_string(SNUM(handle->conn),
960 "scannedonly",
961 "pref_scanned",
962 ".scanned:");
963 so->p_virus =
964 (char *)lp_parm_const_string(SNUM(handle->conn),
965 "scannedonly",
966 "pref_virus",
967 ".virus:");
968 so->p_failed =
969 (char *)lp_parm_const_string(SNUM(handle->conn),
970 "scannedonly",
971 "pref_failed",
972 ".failed:");
973 connect_to_scanner(handle);
974
975 return SMB_VFS_NEXT_CONNECT(handle, service, user);
976}
977
978/* VFS operations structure */
979static struct vfs_fn_pointers vfs_scannedonly_fns = {
980 .opendir = scannedonly_opendir,
981 .readdir = scannedonly_readdir,
982 .seekdir = scannedonly_seekdir,
983 .telldir = scannedonly_telldir,
984 .rewind_dir = scannedonly_rewinddir,
985 .closedir = scannedonly_closedir,
986 .rmdir = scannedonly_rmdir,
987 .stat = scannedonly_stat,
988 .lstat = scannedonly_lstat,
989 .open = scannedonly_open,
990 .close_fn = scannedonly_close,
991 .rename = scannedonly_rename,
992 .unlink = scannedonly_unlink,
993 .connect_fn = scannedonly_connect
994};
995
996NTSTATUS vfs_scannedonly_init(void)
997{
998 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "scannedonly",
999 &vfs_scannedonly_fns);
1000}
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