Convert all uint8/16/32 to _t in all modules.
[kamenim/samba-autobuild/.git] / source3 / modules / vfs_scannedonly.c
1 /*
2  * scannedonly VFS module for Samba 3.5 and beyond
3  *
4  * Copyright 2007,2008,2009,2010,2011 (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 #include "smbd/smbd.h"
52 #include "system/filesys.h"
53
54 #include "config.h"
55
56 #define SENDBUFFERSIZE 1450
57
58 #ifndef       SUN_LEN
59 #define       SUN_LEN(sunp)   ((size_t)((struct sockaddr_un *)0)->sun_path \
60                                 + strlen((sunp)->sun_path))
61 #endif
62
63
64 struct Tscannedonly {
65         int socket;
66         int domain_socket;
67         int portnum;
68         int scanning_message_len;
69         int recheck_time_open;
70         int recheck_tries_open;
71         int recheck_size_open;
72         int recheck_time_readdir;
73         int recheck_tries_readdir;
74         bool show_special_files;
75         bool rm_hidden_files_on_rmdir;
76         bool hide_nonscanned_files;
77         bool allow_nonscanned_files;
78         const char *socketname;
79         const char *scanhost;
80         const char *scanning_message;
81         const char *p_scanned; /* prefix for scanned files */
82         const char *p_virus; /* prefix for virus containing files */
83         const char *p_failed; /* prefix for failed to scan files */
84         char gsendbuffer[SENDBUFFERSIZE + 1];
85 };
86
87 #define STRUCTSCANO(var) ((struct Tscannedonly *)var)
88
89 struct scannedonly_DIR {
90         char *base;
91         int recheck_tries_done; /* if 0 the directory listing has not yet
92         been checked for files that need to be scanned. */
93         DIR *DIR;
94 };
95 #define SCANNEDONLY_DEBUG 9
96 /*********************/
97 /* utility functions */
98 /*********************/
99
100 static char *real_path_from_notify_path(TALLOC_CTX *ctx,
101                                         struct Tscannedonly *so,
102                                         const char *path)
103 {
104         char *name;
105         int len, pathlen;
106
107         name = strrchr(path, '/');
108         if (!name) {
109                 return NULL;
110         }
111         pathlen = name - path;
112         name++;
113         len = strlen(name);
114         if (len <= so->scanning_message_len) {
115                 return NULL;
116         }
117
118         if (strcmp(name + (len - so->scanning_message_len),
119                    so->scanning_message) != 0) {
120                 return NULL;
121         }
122
123         return talloc_strndup(ctx,path,
124                               pathlen + len - so->scanning_message_len);
125 }
126
127 static char *cachefile_name(TALLOC_CTX *ctx,
128                             const char *shortname,
129                             const char *base,
130                             const char *p_scanned)
131 {
132         return talloc_asprintf(ctx, "%s%s%s", base, p_scanned, shortname);
133 }
134
135 static char *name_w_ending_slash(TALLOC_CTX *ctx, const char *name)
136 {
137         int len = strlen(name);
138         if (name[len - 1] == '/') {
139                 return talloc_strdup(ctx,name);
140         } else {
141                 return talloc_asprintf(ctx, "%s/", name);
142         }
143 }
144
145 static char *cachefile_name_f_fullpath(TALLOC_CTX *ctx,
146                                        const char *fullpath,
147                                        const char *p_scanned)
148 {
149         const char *base;
150         char *tmp, *cachefile;
151         const char *shortname;
152         tmp = strrchr(fullpath, '/');
153         if (tmp) {
154                 base = talloc_strndup(ctx, fullpath, (tmp - fullpath) + 1);
155                 shortname = tmp + 1;
156         } else {
157                 base = "";
158                 shortname = (const char *)fullpath;
159         }
160         cachefile = cachefile_name(ctx, shortname, base, p_scanned);
161         DEBUG(SCANNEDONLY_DEBUG,
162               ("cachefile_name_f_fullpath cachefile=%s\n", cachefile));
163         return cachefile;
164 }
165
166 static char *construct_full_path(TALLOC_CTX *ctx, vfs_handle_struct * handle,
167                                  const char *somepath, bool ending_slash)
168 {
169         const char *tmp;
170
171         if (!somepath) {
172                 return NULL;
173         }
174         if (somepath[0] == '/') {
175                 if (ending_slash) {
176                         return name_w_ending_slash(ctx,somepath);
177                 }
178                 return talloc_strdup(ctx,somepath);
179         }
180         tmp = somepath;
181         if (tmp[0]=='.'&&tmp[1]=='/') {
182                 tmp+=2;
183         }
184         /* vfs_GetWd() seems to return a path with a slash */
185         if (ending_slash) {
186                 return talloc_asprintf(ctx, "%s/%s/",
187                                        vfs_GetWd(ctx, handle->conn),tmp);
188         }
189         return talloc_asprintf(ctx, "%s/%s",
190                                vfs_GetWd(ctx, handle->conn),tmp);
191 }
192
193 static int connect_to_scanner(vfs_handle_struct * handle)
194 {
195         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
196
197         if (so->domain_socket) {
198                 struct sockaddr_un saun;
199                 DEBUG(SCANNEDONLY_DEBUG, ("socket=%s\n", so->socketname));
200                 if ((so->socket = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
201                         DEBUG(2, ("failed to create socket %s\n",
202                                   so->socketname));
203                         return -1;
204                 }
205                 saun.sun_family = AF_UNIX;
206                 strncpy(saun.sun_path, so->socketname,
207                         sizeof(saun.sun_path) - 1);
208                 if (connect(so->socket, (struct sockaddr *)(void *)&saun,
209                             SUN_LEN(&saun)) < 0) {
210                         DEBUG(2, ("failed to connect to socket %s\n",
211                                   so->socketname));
212                         return -1;
213                 }
214                 DEBUG(SCANNEDONLY_DEBUG,("bound %s to socket %d\n",
215                                          saun.sun_path, so->socket));
216
217         } else {
218                 so->socket = open_udp_socket(so->scanhost, so->portnum);
219                 if (so->socket < 0) {
220                         DEBUG(2,("failed to open UDP socket to %s:%d\n",
221                                  so->scanhost,so->portnum));
222                         return -1;
223                 }
224         }
225
226         {/* increasing the socket buffer is done because we have large bursts
227             of UDP packets or DGRAM's on a domain socket whenever we hit a
228             large directory with lots of unscanned files. */
229                 int sndsize;
230                 socklen_t size = sizeof(int);
231                 if (getsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
232                                (char *)&sndsize, &size) == 0) {
233                         DEBUG(SCANNEDONLY_DEBUG,
234                               ("current socket buffer size=%d\n",
235                                sndsize));
236                 }
237                 sndsize = 262144;
238                 if (setsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
239                                (char *)&sndsize,
240                                (int)sizeof(sndsize)) != 0) {
241                         DEBUG(SCANNEDONLY_DEBUG,
242                               ("error setting socket buffer %s (%d)\n",
243                                strerror(errno), errno));
244                 }
245         }
246         set_blocking(so->socket, false);
247         return 0;
248 }
249
250 static void flush_sendbuffer(vfs_handle_struct * handle)
251 {
252         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
253         int ret, len, loop = 10;
254         if (so->gsendbuffer[0] == '\0') {
255                 return;
256         }
257
258         do {
259                 loop--;
260                 len = strlen(so->gsendbuffer);
261                 ret = send(so->socket, so->gsendbuffer, len, 0);
262                 if (ret == len) {
263                         so->gsendbuffer[0] = '\0';
264                         break;
265                 }
266                 if (ret == -1) {
267                         DEBUG(3,("scannedonly flush_sendbuffer: "
268                                  "error sending on socket %d to scanner:"
269                                  " %s (%d)\n",
270                                  so->socket, strerror(errno), errno));
271                         if (errno == ECONNREFUSED || errno == ENOTCONN
272                             || errno == ECONNRESET) {
273                                 if (connect_to_scanner(handle) == -1)
274                                         break;  /* connecting fails, abort */
275                                 /* try again */
276                         } else if (errno != EINTR) {
277                                 /* on EINTR we just try again, all remaining
278                                    other errors we log the error
279                                    and try again ONCE */
280                                 loop = 1;
281                                 DEBUG(3,("scannedonly flush_sendbuffer: "
282                                          "error sending data to scanner: %s "
283                                          "(%d)\n", strerror(errno), errno));
284                         }
285                 } else {
286                         /* --> partial write: Resend all filenames that were
287                            not or not completely written. a partial filename
288                            written means the filename will not arrive correctly,
289                            so resend it completely */
290                         int pos = 0;
291                         while (pos < len) {
292                                 char *tmp = strchr(so->gsendbuffer+pos, '\n');
293                                 if (tmp && tmp - so->gsendbuffer < ret)
294                                         pos = tmp - so->gsendbuffer + 1;
295                                 else
296                                         break;
297                         }
298                         memmove(so->gsendbuffer, so->gsendbuffer + pos,
299                                 SENDBUFFERSIZE - ret);
300                         /* now try again */
301                 }
302         } while (loop > 0);
303
304         if (so->gsendbuffer[0] != '\0') {
305                 DEBUG(2,
306                       ("scannedonly flush_sendbuffer: "
307                        "failed to send files to AV scanner, "
308                        "discarding files."));
309                 so->gsendbuffer[0] = '\0';
310         }
311 }
312
313 static void notify_scanner(vfs_handle_struct * handle, const char *scanfile)
314 {
315         const char *tmp;
316         int tmplen, gsendlen;
317         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
318         TALLOC_CTX *ctx=talloc_tos();
319         if (scanfile[0] != '/') {
320                 tmp = construct_full_path(ctx,handle, scanfile, false);
321         } else {
322                 tmp = (const char *)scanfile;
323         }
324         tmplen = strlen(tmp);
325         gsendlen = strlen(so->gsendbuffer);
326         DEBUG(SCANNEDONLY_DEBUG,
327               ("scannedonly notify_scanner: tmp=%s, tmplen=%d, gsendlen=%d\n",
328                tmp, tmplen, gsendlen));
329         if (gsendlen + tmplen >= SENDBUFFERSIZE) {
330                 flush_sendbuffer(handle);
331         }
332         /* FIXME ! Truncate checks... JRA. */
333         (void)strlcat(so->gsendbuffer, tmp, SENDBUFFERSIZE + 1);
334         (void)strlcat(so->gsendbuffer, "\n", SENDBUFFERSIZE + 1);
335 }
336
337 static bool is_scannedonly_file(struct Tscannedonly *so, const char *shortname)
338 {
339         if (shortname[0]!='.') {
340                 return false;
341         }
342         if (strncmp(shortname, so->p_scanned, strlen(so->p_scanned)) == 0) {
343                 return true;
344         }
345         if (strncmp(shortname, so->p_virus, strlen(so->p_virus)) == 0) {
346                 return true;
347         }
348         if (strncmp(shortname, so->p_failed, strlen(so->p_failed)) == 0) {
349                 return true;
350         }
351         return false;
352 }
353
354 static bool timespec_is_newer(struct timespec *base, struct timespec *test)
355 {
356         return timespec_compare(base,test) < 0;
357 }
358
359 /*
360 vfs_handle_struct *handle the scannedonly handle
361 scannedonly_DIR * sDIR the scannedonly struct if called from _readdir()
362 or NULL
363 fullpath is a full path starting from / or a relative path to the
364 current working directory
365 shortname is the filename without directory components
366 basename, is the directory without file name component
367 allow_nonexistent return TRUE if stat() on the requested file fails
368 recheck_time, the time in milliseconds to wait for the daemon to
369 create a .scanned file
370 recheck_tries, the number of tries to wait
371 recheck_size, size in Kb of files that should not be waited for
372 loop : boolean if we should try to loop over all files in the directory
373 and send a notify to the scanner for all files that need scanning
374 */
375 static bool scannedonly_allow_access(vfs_handle_struct * handle,
376                                      struct scannedonly_DIR *sDIR,
377                                      struct smb_filename *smb_fname,
378                                      const char *shortname,
379                                      const char *base_name,
380                                      int allow_nonexistent,
381                                      int recheck_time, int recheck_tries,
382                                      int recheck_size, int loop)
383 {
384         struct smb_filename *cache_smb_fname;
385         TALLOC_CTX *ctx=talloc_tos();
386         char *cachefile;
387         int retval = -1;
388         DEBUG(SCANNEDONLY_DEBUG,
389               ("smb_fname->base_name=%s, shortname=%s, base_name=%s\n"
390                ,smb_fname->base_name,shortname,base_name));
391
392         if (ISDOT(shortname) || ISDOTDOT(shortname)) {
393                 return true;
394         }
395         if (is_scannedonly_file(STRUCTSCANO(handle->data), shortname)) {
396                 DEBUG(SCANNEDONLY_DEBUG,
397                       ("scannedonly_allow_access, %s is a scannedonly file, "
398                        "return 0\n", shortname));
399                 return false;
400         }
401
402         if (!VALID_STAT(smb_fname->st)) {
403                 DEBUG(SCANNEDONLY_DEBUG,("stat %s\n",smb_fname->base_name));
404                 retval = SMB_VFS_NEXT_STAT(handle, smb_fname);
405                 if (retval != 0) {
406                         /* failed to stat this file?!? --> hide it */
407                         DEBUG(SCANNEDONLY_DEBUG,("no valid stat, return"
408                                                  " allow_nonexistent=%d\n",
409                                                  allow_nonexistent));
410                         return allow_nonexistent;
411                 }
412         }
413         if (!S_ISREG(smb_fname->st.st_ex_mode)) {
414                 DEBUG(SCANNEDONLY_DEBUG,
415                       ("%s is not a regular file, ISDIR=%d\n",
416                        smb_fname->base_name,
417                        S_ISDIR(smb_fname->st.st_ex_mode)));
418                 return (STRUCTSCANO(handle->data)->
419                         show_special_files ||
420                         S_ISDIR(smb_fname->st.st_ex_mode));
421         }
422         if (smb_fname->st.st_ex_size == 0) {
423                 DEBUG(SCANNEDONLY_DEBUG,("empty file, return 1\n"));
424                 return true;    /* empty files cannot contain viruses ! */
425         }
426         cachefile = cachefile_name(ctx,
427                                    shortname,
428                                    base_name,
429                                    STRUCTSCANO(handle->data)->p_scanned);
430         cache_smb_fname = synthetic_smb_fname(ctx, cachefile,NULL,NULL);
431         if (!VALID_STAT(cache_smb_fname->st)) {
432                 retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
433         }
434         if (retval == 0 && VALID_STAT(cache_smb_fname->st)) {
435                 if (timespec_is_newer(&smb_fname->st.st_ex_ctime,
436                                       &cache_smb_fname->st.st_ex_ctime)) {
437                         talloc_free(cache_smb_fname);
438                         return true;
439                 }
440                 /* no cachefile or too old */
441                 SMB_VFS_NEXT_UNLINK(handle, cache_smb_fname);
442                 retval = -1;
443         }
444
445         notify_scanner(handle, smb_fname->base_name);
446
447         if (loop && sDIR && sDIR->recheck_tries_done == 0) {
448                 /* check the rest of the directory and notify the
449                    scanner if some file needs scanning */
450                 long offset;
451                 struct dirent *dire;
452
453                 offset = SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
454                 dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, NULL);
455                 while (dire) {
456                         char *fpath2;
457                         struct smb_filename *smb_fname2;
458                         fpath2 = talloc_asprintf(ctx, "%s%s", base_name,dire->d_name);
459                         DEBUG(SCANNEDONLY_DEBUG,
460                               ("scannedonly_allow_access in loop, "
461                                "found %s\n", fpath2));
462                         smb_fname2 = synthetic_smb_fname(
463                                 ctx, fpath2,NULL,NULL);
464                         scannedonly_allow_access(handle, NULL,
465                                                  smb_fname2,
466                                                  dire->d_name,
467                                                  base_name, 0, 0, 0, 0, 0);
468                         talloc_free(fpath2);
469                         talloc_free(smb_fname2);
470                         dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR,NULL);
471                 }
472                 sDIR->recheck_tries_done = 1;
473                 SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
474         }
475         if (recheck_time > 0
476             && ((recheck_size > 0
477                  && smb_fname->st.st_ex_size < (1024 * recheck_size))
478                  || (sDIR && sDIR->recheck_tries_done < recheck_tries)
479                 )) {
480                 int numloops = sDIR ? sDIR->recheck_tries_done : 0;
481                 flush_sendbuffer(handle);
482                 while (retval != 0      /*&& errno == ENOENT */
483                        && numloops < recheck_tries) {
484                         DEBUG(SCANNEDONLY_DEBUG,
485                               ("scannedonly_allow_access, wait (try=%d "
486                                "(max %d), %d ms) for %s\n",
487                                numloops, recheck_tries,
488                                recheck_time, cache_smb_fname->base_name));
489                         smb_msleep(recheck_time);
490                         retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
491                         numloops++;
492                 }
493                 if (sDIR)
494                         sDIR->recheck_tries_done = numloops;
495         }
496         /* still no cachefile, or still too old, return 0 */
497         if (retval != 0
498             || !timespec_is_newer(&smb_fname->st.st_ex_ctime,
499                                   &cache_smb_fname->st.st_ex_ctime)) {
500                 DEBUG(SCANNEDONLY_DEBUG,
501                       ("retval=%d, return 0\n",retval));
502                 return false;
503         }
504         return true;
505 }
506
507 /*********************/
508 /* VFS functions     */
509 /*********************/
510
511 static DIR *scannedonly_opendir(vfs_handle_struct * handle,
512                                            const char *fname,
513                                            const char *mask, uint32_t attr)
514 {
515         DIR *DIRp;
516         struct scannedonly_DIR *sDIR;
517
518         DIRp = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
519         if (!DIRp) {
520                 return NULL;
521         }
522
523         sDIR = talloc(NULL, struct scannedonly_DIR);
524         if (fname[0] != '/') {
525                 sDIR->base = construct_full_path(sDIR,handle, fname, true);
526         } else {
527                 sDIR->base = name_w_ending_slash(sDIR, fname);
528         }
529         DEBUG(SCANNEDONLY_DEBUG,
530                         ("scannedonly_opendir, fname=%s, base=%s\n",fname,sDIR->base));
531         sDIR->DIR = DIRp;
532         sDIR->recheck_tries_done = 0;
533         return (DIR *) sDIR;
534 }
535
536 static DIR *scannedonly_fdopendir(vfs_handle_struct * handle,
537                                            files_struct *fsp,
538                                            const char *mask, uint32_t attr)
539 {
540         DIR *DIRp;
541         struct scannedonly_DIR *sDIR;
542         const char *fname;
543
544         DIRp = SMB_VFS_NEXT_FDOPENDIR(handle, fsp, mask, attr);
545         if (!DIRp) {
546                 return NULL;
547         }
548
549         fname = (const char *)fsp->fsp_name->base_name;
550
551         sDIR = talloc(NULL, struct scannedonly_DIR);
552         if (fname[0] != '/') {
553                 sDIR->base = construct_full_path(sDIR,handle, fname, true);
554         } else {
555                 sDIR->base = name_w_ending_slash(sDIR, fname);
556         }
557         DEBUG(SCANNEDONLY_DEBUG,
558                         ("scannedonly_fdopendir, fname=%s, base=%s\n",fname,sDIR->base));
559         sDIR->DIR = DIRp;
560         sDIR->recheck_tries_done = 0;
561         return (DIR *) sDIR;
562 }
563
564
565 static struct dirent *scannedonly_readdir(vfs_handle_struct *handle,
566                                               DIR * dirp,
567                                               SMB_STRUCT_STAT *sbuf)
568 {
569         struct dirent *result;
570         int allowed = 0;
571         char *tmp;
572         struct smb_filename *smb_fname;
573         char *notify_name;
574         int namelen;
575         struct dirent *newdirent;
576         TALLOC_CTX *ctx=talloc_tos();
577
578         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
579         if (!dirp) {
580                 return NULL;
581         }
582
583         result = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, sbuf);
584
585         if (!result)
586                 return NULL;
587
588         if (is_scannedonly_file(STRUCTSCANO(handle->data), result->d_name)) {
589                 DEBUG(SCANNEDONLY_DEBUG,
590                       ("scannedonly_readdir, %s is a scannedonly file, "
591                        "skip to next entry\n", result->d_name));
592                 return scannedonly_readdir(handle, dirp, NULL);
593         }
594         tmp = talloc_asprintf(ctx, "%s%s", sDIR->base, result->d_name);
595         DEBUG(SCANNEDONLY_DEBUG,
596               ("scannedonly_readdir, check access to %s (sbuf=%p)\n",
597                tmp,sbuf));
598
599         /* even if we don't hide nonscanned files or we allow non scanned
600            files we call allow_access because it will notify the daemon to
601            scan these files */
602         smb_fname = synthetic_smb_fname(ctx, tmp,NULL,
603                                         sbuf?VALID_STAT(*sbuf)?sbuf:NULL:NULL);
604         allowed = scannedonly_allow_access(
605                 handle, sDIR, smb_fname,
606                 result->d_name,
607                 sDIR->base, 0,
608                 STRUCTSCANO(handle->data)->hide_nonscanned_files
609                 ? STRUCTSCANO(handle->data)->recheck_time_readdir
610                 : 0,
611                 STRUCTSCANO(handle->data)->recheck_tries_readdir,
612                 -1,
613                 1);
614         DEBUG(SCANNEDONLY_DEBUG,
615               ("scannedonly_readdir access to %s (%s) = %d\n", tmp,
616                result->d_name, allowed));
617         if (allowed) {
618                 return result;
619         }
620         DEBUG(SCANNEDONLY_DEBUG,
621               ("hide_nonscanned_files=%d, allow_nonscanned_files=%d\n",
622                STRUCTSCANO(handle->data)->hide_nonscanned_files,
623                STRUCTSCANO(handle->data)->allow_nonscanned_files
624                       ));
625
626         if (!STRUCTSCANO(handle->data)->hide_nonscanned_files
627             || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
628                 return result;
629         }
630
631         DEBUG(SCANNEDONLY_DEBUG,
632               ("scannedonly_readdir, readdir listing for %s not "
633                "allowed, notify user\n", result->d_name));
634         notify_name = talloc_asprintf(
635                 ctx,"%s %s",result->d_name,
636                 STRUCTSCANO(handle->data)->scanning_message);
637         namelen = strlen(notify_name);
638         newdirent = (struct dirent *)talloc_array(
639                 ctx, char, sizeof(struct dirent) + namelen + 1);
640         if (!newdirent) {
641                 return NULL;
642         }
643         memcpy(newdirent, result, sizeof(struct dirent));
644         memcpy(&newdirent->d_name, notify_name, namelen + 1);
645         DEBUG(SCANNEDONLY_DEBUG,
646               ("scannedonly_readdir, return newdirent at %p with "
647                "notification %s\n", newdirent, newdirent->d_name));
648         return newdirent;
649 }
650
651 static void scannedonly_seekdir(struct vfs_handle_struct *handle,
652                                 DIR * dirp, long offset)
653 {
654         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
655         SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
656 }
657
658 static long scannedonly_telldir(struct vfs_handle_struct *handle,
659                                 DIR * dirp)
660 {
661         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
662         return SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
663 }
664
665 static void scannedonly_rewinddir(struct vfs_handle_struct *handle,
666                                   DIR * dirp)
667 {
668         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
669         SMB_VFS_NEXT_REWINDDIR(handle, sDIR->DIR);
670 }
671
672 static int scannedonly_closedir(vfs_handle_struct * handle,
673                                 DIR * dirp)
674 {
675         int retval;
676         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
677         flush_sendbuffer(handle);
678         retval = SMB_VFS_NEXT_CLOSEDIR(handle, sDIR->DIR);
679         TALLOC_FREE(sDIR);
680         return retval;
681 }
682
683 static int scannedonly_stat(vfs_handle_struct * handle,
684                             struct smb_filename *smb_fname)
685 {
686         int ret;
687         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
688         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_stat: %s returned %d\n",
689                                   smb_fname->base_name, ret));
690         if (ret != 0 && errno == ENOENT) {
691                 TALLOC_CTX *ctx=talloc_tos();
692                 char *test_base_name, *tmp_base_name = smb_fname->base_name;
693                 /* possibly this was a fake name (file is being scanned for
694                    viruses.txt): check for that and create the real name and
695                    stat the real name */
696                 test_base_name = real_path_from_notify_path(
697                         ctx,
698                         STRUCTSCANO(handle->data),
699                         smb_fname->base_name);
700                 if (test_base_name) {
701                         smb_fname->base_name = test_base_name;
702                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
703                         DEBUG(5, ("_stat: %s returned %d\n",
704                                   test_base_name, ret));
705                         smb_fname->base_name = tmp_base_name;
706                 }
707         }
708         return ret;
709 }
710
711 static int scannedonly_lstat(vfs_handle_struct * handle,
712                              struct smb_filename *smb_fname)
713 {
714         int ret;
715         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
716         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_lstat: %s returned %d\n",
717                                   smb_fname->base_name, ret));
718         if (ret != 0 && errno == ENOENT) {
719                 TALLOC_CTX *ctx=talloc_tos();
720                 char *test_base_name, *tmp_base_name = smb_fname->base_name;
721                 /* possibly this was a fake name (file is being scanned for
722                    viruses.txt): check for that and create the real name and
723                    stat the real name */
724                 test_base_name = real_path_from_notify_path(
725                         ctx, STRUCTSCANO(handle->data), smb_fname->base_name);
726                 if (test_base_name) {
727                         smb_fname->base_name = test_base_name;
728                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
729                         DEBUG(5, ("_lstat: %s returned %d\n",
730                                   test_base_name, ret));
731                         smb_fname->base_name = tmp_base_name;
732                 }
733         }
734         return ret;
735 }
736
737 static int scannedonly_open(vfs_handle_struct * handle,
738                             struct smb_filename *smb_fname,
739                             files_struct * fsp, int flags, mode_t mode)
740 {
741         const char *base;
742         char *tmp, *shortname;
743         int allowed, write_access = 0;
744         TALLOC_CTX *ctx=talloc_tos();
745         /* if open for writing ignore it */
746         if ((flags & O_ACCMODE) == O_WRONLY) {
747                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
748         }
749         if ((flags & O_ACCMODE) == O_RDWR) {
750                 write_access = 1;
751         }
752         /* check if this file is scanned already */
753         tmp = strrchr(smb_fname->base_name, '/');
754         if (tmp) {
755                 base = talloc_strndup(ctx,smb_fname->base_name,
756                                       (tmp - smb_fname->base_name) + 1);
757                 shortname = tmp + 1;
758         } else {
759                 base = "";
760                 shortname = (char *)smb_fname->base_name;
761         }
762         allowed = scannedonly_allow_access(
763                 handle, NULL, smb_fname, shortname,
764                 base,
765                 write_access,
766                 STRUCTSCANO(handle->data)->recheck_time_open,
767                 STRUCTSCANO(handle->data)->recheck_tries_open,
768                 STRUCTSCANO(handle->data)->recheck_size_open,
769                 0);
770         flush_sendbuffer(handle);
771         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_open: allow=%d for %s\n",
772                                   allowed, smb_fname->base_name));
773         if (allowed
774             || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
775                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
776         }
777         errno = EACCES;
778         return -1;
779 }
780
781 static int scannedonly_close(vfs_handle_struct * handle, files_struct * fsp)
782 {
783         /* we only have to notify the scanner
784            for files that were open readwrite or writable. */
785         if (fsp->can_write) {
786                 TALLOC_CTX *ctx = talloc_tos();
787                 notify_scanner(handle, construct_full_path(
788                                        ctx,handle,
789                                        fsp->fsp_name->base_name,false));
790                 flush_sendbuffer(handle);
791         }
792         return SMB_VFS_NEXT_CLOSE(handle, fsp);
793 }
794
795 static int scannedonly_rename(vfs_handle_struct * handle,
796                               const struct smb_filename *smb_fname_src,
797                               const struct smb_filename *smb_fname_dst)
798 {
799         /* rename the cache file before we pass the actual rename on */
800         struct smb_filename *smb_fname_src_tmp = NULL;
801         struct smb_filename *smb_fname_dst_tmp = NULL;
802         char *cachefile_src, *cachefile_dst;
803         bool needscandst=false;
804         int ret;
805         TALLOC_CTX *ctx = talloc_tos();
806
807         /* Setup temporary smb_filename structs. */
808         cachefile_src = cachefile_name_f_fullpath(
809                 ctx,
810                 smb_fname_src->base_name,
811                 STRUCTSCANO(handle->data)->p_scanned);
812         cachefile_dst = cachefile_name_f_fullpath(
813                 ctx,
814                 smb_fname_dst->base_name,
815                 STRUCTSCANO(handle->data)->p_scanned);
816         smb_fname_src_tmp = synthetic_smb_fname(ctx, cachefile_src,NULL,NULL);
817         smb_fname_dst_tmp = synthetic_smb_fname(ctx, cachefile_dst,NULL,NULL);
818
819         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_tmp, smb_fname_dst_tmp);
820         if (ret == ENOENT) {
821                 needscandst=true;
822         } else if (ret != 0) {
823                 DEBUG(SCANNEDONLY_DEBUG,
824                       ("failed to rename %s into %s error %d: %s\n", cachefile_src,
825                        cachefile_dst, ret, strerror(ret)));
826                 needscandst=true;
827         }
828         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
829         if (ret == 0 && needscandst) {
830                 notify_scanner(handle, smb_fname_dst->base_name);
831                 flush_sendbuffer(handle);
832         }
833         return ret;
834 }
835
836 static int scannedonly_unlink(vfs_handle_struct * handle,
837                               const struct smb_filename *smb_fname)
838 {
839         /* unlink the 'scanned' file too */
840         struct smb_filename *smb_fname_cache = NULL;
841         char * cachefile;
842         TALLOC_CTX *ctx = talloc_tos();
843
844         cachefile = cachefile_name_f_fullpath(
845                 ctx,
846                 smb_fname->base_name,
847                 STRUCTSCANO(handle->data)->p_scanned);
848         smb_fname_cache = synthetic_smb_fname(ctx, cachefile,NULL,NULL);
849         if (SMB_VFS_NEXT_UNLINK(handle, smb_fname_cache) != 0) {
850                 DEBUG(SCANNEDONLY_DEBUG, ("_unlink: failed to unlink %s\n",
851                                           smb_fname_cache->base_name));
852         }
853         return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
854 }
855
856 static int scannedonly_rmdir(vfs_handle_struct * handle, const char *path)
857 {
858         /* if there are only .scanned: .virus: or .failed: files, we delete
859            those, because the client cannot see them */
860         DIR *dirp;
861         struct dirent *dire;
862         TALLOC_CTX *ctx = talloc_tos();
863         bool only_deletable_files = true, have_files = false;
864         char *path_w_slash;
865
866         if (!STRUCTSCANO(handle->data)->rm_hidden_files_on_rmdir)
867                 return SMB_VFS_NEXT_RMDIR(handle, path);
868
869         path_w_slash = name_w_ending_slash(ctx,path);
870         dirp = SMB_VFS_NEXT_OPENDIR(handle, path, NULL, 0);
871         if (!dirp) {
872                 return -1;
873         }
874         while ((dire = SMB_VFS_NEXT_READDIR(handle, dirp, NULL)) != NULL) {
875                 if (ISDOT(dire->d_name) || ISDOTDOT(dire->d_name)) {
876                         continue;
877                 }
878                 have_files = true;
879                 if (!is_scannedonly_file(STRUCTSCANO(handle->data),
880                                          dire->d_name)) {
881                         struct smb_filename *smb_fname = NULL;
882                         char *fullpath;
883                         int retval;
884
885                         if (STRUCTSCANO(handle->data)->show_special_files) {
886                                 only_deletable_files = false;
887                                 break;
888                         }
889                         /* stat the file and see if it is a
890                            special file */
891                         fullpath = talloc_asprintf(ctx, "%s%s", path_w_slash,
892                                                   dire->d_name);
893                         smb_fname = synthetic_smb_fname(ctx, fullpath,
894                                                         NULL,NULL);
895                         retval = SMB_VFS_NEXT_STAT(handle, smb_fname);
896                         if (retval == 0
897                             && S_ISREG(smb_fname->st.st_ex_mode)) {
898                                 only_deletable_files = false;
899                         }
900                         TALLOC_FREE(fullpath);
901                         TALLOC_FREE(smb_fname);
902                         break;
903                 }
904         }
905         DEBUG(SCANNEDONLY_DEBUG,
906               ("path=%s, have_files=%d, only_deletable_files=%d\n",
907                path, have_files, only_deletable_files));
908         if (have_files && only_deletable_files) {
909                 DEBUG(SCANNEDONLY_DEBUG,
910                       ("scannedonly_rmdir, remove leftover scannedonly "
911                        "files from %s\n", path_w_slash));
912                 SMB_VFS_NEXT_REWINDDIR(handle, dirp);
913                 while ((dire = SMB_VFS_NEXT_READDIR(handle, dirp, NULL))
914                        != NULL) {
915                         char *fullpath;
916                         struct smb_filename *smb_fname = NULL;
917                         if (ISDOT(dire->d_name) || ISDOTDOT(dire->d_name)) {
918                                 continue;
919                         }
920                         fullpath = talloc_asprintf(ctx, "%s%s", path_w_slash,
921                                                   dire->d_name);
922                         smb_fname = synthetic_smb_fname(ctx, fullpath,
923                                                         NULL,NULL);
924                         DEBUG(SCANNEDONLY_DEBUG, ("unlink %s\n", fullpath));
925                         SMB_VFS_NEXT_UNLINK(handle, smb_fname);
926                         TALLOC_FREE(fullpath);
927                         TALLOC_FREE(smb_fname);
928                 }
929         }
930         SMB_VFS_NEXT_CLOSEDIR(handle, dirp);
931         return SMB_VFS_NEXT_RMDIR(handle, path);
932 }
933
934 static void free_scannedonly_data(void **data)
935 {
936         SAFE_FREE(*data);
937 }
938
939 static int scannedonly_connect(struct vfs_handle_struct *handle,
940                                const char *service, const char *user)
941 {
942
943         struct Tscannedonly *so;
944
945         so = SMB_MALLOC_P(struct Tscannedonly);
946         if (so == NULL) {
947                 errno = ENOMEM;
948                 return -1;
949         }
950         handle->data = (void *)so;
951         handle->free_data = free_scannedonly_data;
952         so->gsendbuffer[0]='\0';
953         so->domain_socket =
954                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
955                              "domain_socket", True);
956         so->socketname = lp_parm_const_string(SNUM(handle->conn),
957                                              "scannedonly", "socketname",
958                                              "/var/lib/scannedonly/scan");
959
960         so->portnum =
961                 lp_parm_int(SNUM(handle->conn), "scannedonly", "portnum",
962                             2020);
963         so->scanhost = lp_parm_const_string(SNUM(handle->conn),
964                                              "scannedonly", "scanhost",
965                                              "localhost");
966
967         so->show_special_files =
968                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
969                              "show_special_files", True);
970         so->rm_hidden_files_on_rmdir =
971                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
972                              "rm_hidden_files_on_rmdir", True);
973         so->hide_nonscanned_files =
974                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
975                              "hide_nonscanned_files", False);
976         so->allow_nonscanned_files =
977                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
978                              "allow_nonscanned_files", False);
979         so->scanning_message = lp_parm_const_string(SNUM(handle->conn),
980                                              "scannedonly",
981                                              "scanning_message",
982                                              "is being scanned for viruses");
983         so->scanning_message_len = strlen(so->scanning_message);
984         so->recheck_time_open =
985                 lp_parm_int(SNUM(handle->conn), "scannedonly",
986                             "recheck_time_open", 50);
987         so->recheck_tries_open =
988                 lp_parm_int(SNUM(handle->conn), "scannedonly",
989                             "recheck_tries_open", 100);
990         so->recheck_size_open =
991                 lp_parm_int(SNUM(handle->conn), "scannedonly",
992                             "recheck_size_open", 100);
993         so->recheck_time_readdir =
994                 lp_parm_int(SNUM(handle->conn), "scannedonly",
995                             "recheck_time_readdir", 50);
996         so->recheck_tries_readdir =
997                 lp_parm_int(SNUM(handle->conn), "scannedonly",
998                             "recheck_tries_readdir", 20);
999
1000         so->p_scanned =
1001                 lp_parm_const_string(SNUM(handle->conn),
1002                                              "scannedonly",
1003                                              "pref_scanned",
1004                                              ".scanned:");
1005         so->p_virus =
1006                 lp_parm_const_string(SNUM(handle->conn),
1007                                              "scannedonly",
1008                                              "pref_virus",
1009                                              ".virus:");
1010         so->p_failed =
1011                 lp_parm_const_string(SNUM(handle->conn),
1012                                              "scannedonly",
1013                                              "pref_failed",
1014                                              ".failed:");
1015         connect_to_scanner(handle);
1016
1017         return SMB_VFS_NEXT_CONNECT(handle, service, user);
1018 }
1019
1020 /* VFS operations structure */
1021 static struct vfs_fn_pointers vfs_scannedonly_fns = {
1022         .opendir_fn = scannedonly_opendir,
1023         .fdopendir_fn = scannedonly_fdopendir,
1024         .readdir_fn = scannedonly_readdir,
1025         .seekdir_fn = scannedonly_seekdir,
1026         .telldir_fn = scannedonly_telldir,
1027         .rewind_dir_fn = scannedonly_rewinddir,
1028         .closedir_fn = scannedonly_closedir,
1029         .rmdir_fn = scannedonly_rmdir,
1030         .stat_fn = scannedonly_stat,
1031         .lstat_fn = scannedonly_lstat,
1032         .open_fn = scannedonly_open,
1033         .close_fn = scannedonly_close,
1034         .rename_fn = scannedonly_rename,
1035         .unlink_fn = scannedonly_unlink,
1036         .connect_fn = scannedonly_connect
1037 };
1038
1039 NTSTATUS vfs_scannedonly_init(void)
1040 {
1041         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "scannedonly",
1042                                 &vfs_scannedonly_fns);
1043 }