source3/modules/vfs_scannedonly.c

   1 /*
   2  * scannedonly VFS module for Samba 3.5
   3  *
   4  * Copyright 2007,2008,2009,2010 (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 notify_loop_done;
  92         SMB_STRUCT_DIR *DIR;
  93 };
  94 #define SCANNEDONLY_DEBUG 9
  95 /*********************/
  96 /* utility functions */
  97 /*********************/
  98
  99 static char *real_path_from_notify_path(TALLOC_CTX *ctx,
 100                                         struct Tscannedonly *so,
 101                                         const char *path)
 102 {
 103         char *name;
 104         int len, pathlen;
 105
 106         name = strrchr(path, '/');
 107         if (!name) {
 108                 return NULL;
 109         }
 110         pathlen = name - path;
 111         name++;
 112         len = strlen(name);
 113         if (len <= so->scanning_message_len) {
 114                 return NULL;
 115         }
 116
 117         if (strcmp(name + (len - so->scanning_message_len),
 118                    so->scanning_message) != 0) {
 119                 return NULL;
 120         }
 121
 122         return talloc_strndup(ctx,path,
 123                               pathlen + len - so->scanning_message_len);
 124 }
 125
 126 static char *cachefile_name(TALLOC_CTX *ctx,
 127                             const char *shortname,
 128                             const char *base,
 129                             const char *p_scanned)
 130 {
 131         return talloc_asprintf(ctx, "%s%s%s", base, p_scanned, shortname);
 132 }
 133
 134 static char *name_w_ending_slash(TALLOC_CTX *ctx, const char *name)
 135 {
 136         int len = strlen(name);
 137         if (name[len - 1] == '/') {
 138                 return talloc_strdup(ctx,name);
 139         } else {
 140                 return talloc_asprintf(ctx, "%s/", name);
 141         }
 142 }
 143
 144 static char *cachefile_name_f_fullpath(TALLOC_CTX *ctx,
 145                                        const char *fullpath,
 146                                        const char *p_scanned)
 147 {
 148         const char *base;
 149         char *tmp, *cachefile;
 150         const char *shortname;
 151         tmp = strrchr(fullpath, '/');
 152         if (tmp) {
 153                 base = talloc_strndup(ctx, fullpath, (tmp - fullpath) + 1);
 154                 shortname = tmp + 1;
 155         } else {
 156                 base = "";
 157                 shortname = (const char *)fullpath;
 158         }
 159         cachefile = cachefile_name(ctx, shortname, base, p_scanned);
 160         DEBUG(SCANNEDONLY_DEBUG,
 161               ("cachefile_name_f_fullpath cachefile=%s\n", cachefile));
 162         return cachefile;
 163 }
 164
 165 static char *construct_full_path(TALLOC_CTX *ctx, vfs_handle_struct * handle,
 166                                  const char *somepath, bool ending_slash)
 167 {
 168         const char *tmp;
 169
 170         if (!somepath) {
 171                 return NULL;
 172         }
 173         if (somepath[0] == '/') {
 174                 if (ending_slash) {
 175                         return name_w_ending_slash(ctx,somepath);
 176                 }
 177                 return talloc_strdup(ctx,somepath);
 178         }
 179         tmp = somepath;
 180         if (tmp[0]=='.'&&tmp[1]=='/') {
 181                 tmp+=2;
 182         }
 183         /* vfs_GetWd() seems to return a path with a slash */
 184         if (ending_slash) {
 185                 return talloc_asprintf(ctx, "%s/%s/",
 186                                        vfs_GetWd(ctx, handle->conn),tmp);
 187         }
 188         return talloc_asprintf(ctx, "%s/%s",
 189                                vfs_GetWd(ctx, handle->conn),tmp);
 190 }
 191
 192 static int connect_to_scanner(vfs_handle_struct * handle)
 193 {
 194         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
 195
 196         if (so->domain_socket) {
 197                 struct sockaddr_un saun;
 198                 DEBUG(SCANNEDONLY_DEBUG, ("socket=%s\n", so->socketname));
 199                 if ((so->socket = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
 200                         DEBUG(2, ("failed to create socket %s\n",
 201                                   so->socketname));
 202                         return -1;
 203                 }
 204                 saun.sun_family = AF_UNIX;
 205                 strncpy(saun.sun_path, so->socketname,
 206                         sizeof(saun.sun_path) - 1);
 207                 if (connect(so->socket, (struct sockaddr *)(void *)&saun,
 208                             SUN_LEN(&saun)) < 0) {
 209                         DEBUG(2, ("failed to connect to socket %s\n",
 210                                   so->socketname));
 211                         return -1;
 212                 }
 213                 DEBUG(SCANNEDONLY_DEBUG,("bound %s to socket %d\n",
 214                                          saun.sun_path, so->socket));
 215
 216         } else {
 217                 so->socket = open_udp_socket(so->scanhost, so->portnum);
 218                 if (so->socket < 0) {
 219                         DEBUG(2,("failed to open UDP socket to %s:%d\n",
 220                                  so->scanhost,so->portnum));
 221                         return -1;
 222                 }
 223         }
 224
 225         {/* increasing the socket buffer is done because we have large bursts
 226             of UDP packets or DGRAM's on a domain socket whenever we hit a
 227             large directory with lots of unscanned files. */
 228                 int sndsize;
 229                 socklen_t size = sizeof(int);
 230                 getsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
 231                            (char *)&sndsize, &size);
 232                 DEBUG(SCANNEDONLY_DEBUG, ("current socket buffer size=%d\n",
 233                                           sndsize));
 234                 sndsize = 262144;
 235                 if (setsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
 236                                (char *)&sndsize,
 237                                (int)sizeof(sndsize)) != 0) {
 238                         DEBUG(SCANNEDONLY_DEBUG,
 239                               ("error setting socket buffer %s (%d)\n",
 240                                strerror(errno), errno));
 241                 }
 242         }
 243         set_blocking(so->socket, false);
 244         return 0;
 245 }
 246
 247 static void flush_sendbuffer(vfs_handle_struct * handle)
 248 {
 249         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
 250         int ret, len, loop = 10;
 251         if (so->gsendbuffer[0] == '\0') {
 252                 return;
 253         }
 254
 255         do {
 256                 loop--;
 257                 len = strlen(so->gsendbuffer);
 258                 ret = send(so->socket, so->gsendbuffer, len, 0);
 259                 if (ret == len) {
 260                         so->gsendbuffer[0] = '\0';
 261                         break;
 262                 }
 263                 if (ret == -1) {
 264                         DEBUG(3,("scannedonly flush_sendbuffer: "
 265                                  "error sending on socket %d to scanner:"
 266                                  " %s (%d)\n",
 267                                  so->socket, strerror(errno), errno));
 268                         if (errno == ECONNREFUSED || errno == ENOTCONN
 269                             || errno == ECONNRESET) {
 270                                 if (connect_to_scanner(handle) == -1)
 271                                         break;  /* connecting fails, abort */
 272                                 /* try again */
 273                         } else if (errno != EINTR) {
 274                                 /* on EINTR we just try again, all remaining
 275                                    other errors we log the error
 276                                    and try again ONCE */
 277                                 loop = 1;
 278                                 DEBUG(3,("scannedonly flush_sendbuffer: "
 279                                          "error sending data to scanner: %s "
 280                                          "(%d)\n", strerror(errno), errno));
 281                         }
 282                 } else {
 283                         /* --> partial write: Resend all filenames that were
 284                            not or not completely written. a partial filename
 285                            written means the filename will not arrive correctly,
 286                            so resend it completely */
 287                         int pos = 0;
 288                         while (pos < len) {
 289                                 char *tmp = strchr(so->gsendbuffer+pos, '\n');
 290                                 if (tmp && tmp - so->gsendbuffer < ret)
 291                                         pos = tmp - so->gsendbuffer + 1;
 292                                 else
 293                                         break;
 294                         }
 295                         memmove(so->gsendbuffer, so->gsendbuffer + pos,
 296                                 SENDBUFFERSIZE - ret);
 297                         /* now try again */
 298                 }
 299         } while (loop > 0);
 300
 301         if (so->gsendbuffer[0] != '\0') {
 302                 DEBUG(2,
 303                       ("scannedonly flush_sendbuffer: "
 304                        "failed to send files to AV scanner, "
 305                        "discarding files."));
 306                 so->gsendbuffer[0] = '\0';
 307         }
 308 }
 309
 310 static void notify_scanner(vfs_handle_struct * handle, const char *scanfile)
 311 {
 312         const char *tmp;
 313         int tmplen, gsendlen;
 314         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
 315         TALLOC_CTX *ctx=talloc_tos();
 316         if (scanfile[0] != '/') {
 317                 tmp = construct_full_path(ctx,handle, scanfile, false);
 318         } else {
 319                 tmp = (const char *)scanfile;
 320         }
 321         tmplen = strlen(tmp);
 322         gsendlen = strlen(so->gsendbuffer);
 323         DEBUG(SCANNEDONLY_DEBUG,
 324               ("scannedonly notify_scanner: tmp=%s, tmplen=%d, gsendlen=%d\n",
 325                tmp, tmplen, gsendlen));
 326         if (gsendlen + tmplen >= SENDBUFFERSIZE) {
 327                 flush_sendbuffer(handle);
 328         }
 329         strlcat(so->gsendbuffer, tmp, SENDBUFFERSIZE + 1);
 330         strlcat(so->gsendbuffer, "\n", SENDBUFFERSIZE + 1);
 331 }
 332
 333 static bool is_scannedonly_file(struct Tscannedonly *so, const char *shortname)
 334 {
 335         if (shortname[0]!='.') {
 336                 return false;
 337         }
 338         if (strncmp(shortname, so->p_scanned, strlen(so->p_scanned)) == 0) {
 339                 return true;
 340         }
 341         if (strncmp(shortname, so->p_virus, strlen(so->p_virus)) == 0) {
 342                 return true;
 343         }
 344         if (strncmp(shortname, so->p_failed, strlen(so->p_failed)) == 0) {
 345                 return true;
 346         }
 347         return false;
 348 }
 349
 350 static bool timespec_is_newer(struct timespec *base, struct timespec *test)
 351 {
 352         return timespec_compare(base,test) < 0;
 353 }
 354
 355 /*
 356 vfs_handle_struct *handle the scannedonly handle
 357 scannedonly_DIR * sDIR the scannedonly struct if called from _readdir()
 358 or NULL
 359 fullpath is a full path starting from / or a relative path to the
 360 current working directory
 361 shortname is the filename without directory components
 362 basename, is the directory without file name component
 363 allow_nonexistant return TRUE if stat() on the requested file fails
 364 recheck_time, the time in milliseconds to wait for the daemon to
 365 create a .scanned file
 366 recheck_tries, the number of tries to wait
 367 recheck_size, size in Kb of files that should not be waited for
 368 loop : boolean if we should try to loop over all files in the directory
 369 and send a notify to the scanner for all files that need scanning
 370 */
 371 static bool scannedonly_allow_access(vfs_handle_struct * handle,
 372                                      struct scannedonly_DIR *sDIR,
 373                                      struct smb_filename *smb_fname,
 374                                      const char *shortname,
 375                                      const char *base_name,
 376                                      int allow_nonexistant,
 377                                      int recheck_time, int recheck_tries,
 378                                      int recheck_size, int loop)
 379 {
 380         struct smb_filename *cache_smb_fname;
 381         TALLOC_CTX *ctx=talloc_tos();
 382         char *cachefile;
 383         int retval = -1;
 384         int didloop;
 385         DEBUG(SCANNEDONLY_DEBUG,
 386               ("smb_fname->base_name=%s, shortname=%s, base_name=%s\n"
 387                ,smb_fname->base_name,shortname,base_name));
 388
 389         if (ISDOT(shortname) || ISDOTDOT(shortname)) {
 390                 return true;
 391         }
 392         if (is_scannedonly_file(STRUCTSCANO(handle->data), shortname)) {
 393                 DEBUG(SCANNEDONLY_DEBUG,
 394                       ("scannedonly_allow_access, %s is a scannedonly file, "
 395                        "return 0\n", shortname));
 396                 return false;
 397         }
 398
 399         if (!VALID_STAT(smb_fname->st)) {
 400                 DEBUG(SCANNEDONLY_DEBUG,("stat %s\n",smb_fname->base_name));
 401                 retval = SMB_VFS_NEXT_STAT(handle, smb_fname);
 402                 if (retval != 0) {
 403                         /* failed to stat this file?!? --> hide it */
 404                         DEBUG(SCANNEDONLY_DEBUG,("no valid stat, return"
 405                                                  " allow_nonexistant=%d\n",
 406                                                  allow_nonexistant));
 407                         return allow_nonexistant;
 408                 }
 409         }
 410         if (!S_ISREG(smb_fname->st.st_ex_mode)) {
 411                 DEBUG(SCANNEDONLY_DEBUG,
 412                       ("%s is not a regular file, ISDIR=%d\n",
 413                        smb_fname->base_name,
 414                        S_ISDIR(smb_fname->st.st_ex_mode)));
 415                 return (STRUCTSCANO(handle->data)->
 416                         show_special_files ||
 417                         S_ISDIR(smb_fname->st.st_ex_mode));
 418         }
 419         if (smb_fname->st.st_ex_size == 0) {
 420                 DEBUG(SCANNEDONLY_DEBUG,("empty file, return 1\n"));
 421                 return true;    /* empty files cannot contain viruses ! */
 422         }
 423         cachefile = cachefile_name(ctx,
 424                                    shortname,
 425                                    base_name,
 426                                    STRUCTSCANO(handle->data)->p_scanned);
 427         create_synthetic_smb_fname(ctx, cachefile,NULL,NULL,&cache_smb_fname);
 428         if (!VALID_STAT(cache_smb_fname->st)) {
 429                 retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
 430         }
 431         if (retval == 0 && VALID_STAT(cache_smb_fname->st)) {
 432                 if (timespec_is_newer(&smb_fname->st.st_ex_ctime,
 433                                       &cache_smb_fname->st.st_ex_ctime)) {
 434                         talloc_free(cache_smb_fname);
 435                         return true;
 436                 }
 437                 /* no cachefile or too old */
 438                 SMB_VFS_NEXT_UNLINK(handle, cache_smb_fname);
 439                 retval = -1;
 440         }
 441
 442         notify_scanner(handle, smb_fname->base_name);
 443
 444         didloop = 0;
 445         if (loop && sDIR && !sDIR->notify_loop_done) {
 446                 /* check the rest of the directory and notify the
 447                    scanner if some file needs scanning */
 448                 long offset;
 449                 SMB_STRUCT_DIRENT *dire;
 450
 451                 offset = SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
 452                 dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, NULL);
 453                 while (dire) {
 454                         char *fpath2;
 455                         struct smb_filename *smb_fname2;
 456                         fpath2 = talloc_asprintf(ctx, "%s%s", base_name,dire->d_name);
 457                         DEBUG(SCANNEDONLY_DEBUG,
 458                               ("scannedonly_allow_access in loop, "
 459                                "found %s\n", fpath2));
 460                         create_synthetic_smb_fname(ctx, fpath2,NULL,NULL,
 461                                                    &smb_fname2);
 462                         scannedonly_allow_access(handle, NULL,
 463                                                  smb_fname2,
 464                                                  dire->d_name,
 465                                                  base_name, 0, 0, 0, 0, 0);
 466                         talloc_free(fpath2);
 467                         talloc_free(smb_fname2);
 468                         dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR,NULL);
 469                 }
 470                 sDIR->notify_loop_done = 1;
 471                 didloop = 1;
 472                 SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
 473         }
 474         if (recheck_time > 0
 475             && ((recheck_size > 0
 476                  && smb_fname->st.st_ex_size < (1024 * recheck_size))
 477                 || didloop)) {
 478                 int i = 0;
 479                 flush_sendbuffer(handle);
 480                 while (retval != 0      /*&& errno == ENOENT */
 481                        && i < recheck_tries) {
 482                         DEBUG(SCANNEDONLY_DEBUG,
 483                               ("scannedonly_allow_access, wait (try=%d "
 484                                "(max %d), %d ms) for %s\n",
 485                                i, recheck_tries,
 486                                recheck_time, cache_smb_fname->base_name));
 487                         smb_msleep(recheck_time);
 488                         retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
 489                         i++;
 490                 }
 491         }
 492         /* still no cachefile, or still too old, return 0 */
 493         if (retval != 0
 494             || !timespec_is_newer(&smb_fname->st.st_ex_ctime,
 495                                   &cache_smb_fname->st.st_ex_ctime)) {
 496                 DEBUG(SCANNEDONLY_DEBUG,
 497                       ("retval=%d, return 0\n",retval));
 498                 return false;
 499         }
 500         return true;
 501 }
 502
 503 /*********************/
 504 /* VFS functions     */
 505 /*********************/
 506
 507 static SMB_STRUCT_DIR *scannedonly_opendir(vfs_handle_struct * handle,
 508                                            const char *fname,
 509                                            const char *mask, uint32 attr)
 510 {
 511         SMB_STRUCT_DIR *DIRp;
 512         struct scannedonly_DIR *sDIR;
 513
 514         DIRp = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 515         if (!DIRp) {
 516                 return NULL;
 517         }
 518
 519         sDIR = TALLOC_P(NULL, struct scannedonly_DIR);
 520         if (fname[0] != '/') {
 521                 sDIR->base = construct_full_path(sDIR,handle, fname, true);
 522         } else {
 523                 sDIR->base = name_w_ending_slash(sDIR, fname);
 524         }
 525         DEBUG(SCANNEDONLY_DEBUG,
 526                         ("scannedonly_opendir, fname=%s, base=%s\n",fname,sDIR->base));
 527         sDIR->DIR = DIRp;
 528         sDIR->notify_loop_done = 0;
 529         return (SMB_STRUCT_DIR *) sDIR;
 530 }
 531
 532 static SMB_STRUCT_DIR *scannedonly_fdopendir(vfs_handle_struct * handle,
 533                                            files_struct *fsp,
 534                                            const char *mask, uint32 attr)
 535 {
 536         SMB_STRUCT_DIR *DIRp;
 537         struct scannedonly_DIR *sDIR;
 538         const char *fname;
 539
 540         DIRp = SMB_VFS_NEXT_FDOPENDIR(handle, fsp, mask, attr);
 541         if (!DIRp) {
 542                 return NULL;
 543         }
 544
 545         fname = (const char *)fsp->fsp_name->base_name;
 546
 547         sDIR = TALLOC_P(NULL, struct scannedonly_DIR);
 548         if (fname[0] != '/') {
 549                 sDIR->base = construct_full_path(sDIR,handle, fname, true);
 550         } else {
 551                 sDIR->base = name_w_ending_slash(sDIR, fname);
 552         }
 553         DEBUG(SCANNEDONLY_DEBUG,
 554                         ("scannedonly_fdopendir, fname=%s, base=%s\n",fname,sDIR->base));
 555         sDIR->DIR = DIRp;
 556         sDIR->notify_loop_done = 0;
 557         return (SMB_STRUCT_DIR *) sDIR;
 558 }
 559
 560
 561 static SMB_STRUCT_DIRENT *scannedonly_readdir(vfs_handle_struct *handle,
 562                                               SMB_STRUCT_DIR * dirp,
 563                                               SMB_STRUCT_STAT *sbuf)
 564 {
 565         SMB_STRUCT_DIRENT *result;
 566         int allowed = 0;
 567         char *tmp;
 568         struct smb_filename *smb_fname;
 569         char *notify_name;
 570         int namelen;
 571         SMB_STRUCT_DIRENT *newdirent;
 572         TALLOC_CTX *ctx=talloc_tos();
 573
 574         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 575         if (!dirp) {
 576                 return NULL;
 577         }
 578
 579         result = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, sbuf);
 580
 581         if (!result)
 582                 return NULL;
 583
 584         if (is_scannedonly_file(STRUCTSCANO(handle->data), result->d_name)) {
 585                 DEBUG(SCANNEDONLY_DEBUG,
 586                       ("scannedonly_readdir, %s is a scannedonly file, "
 587                        "skip to next entry\n", result->d_name));
 588                 return scannedonly_readdir(handle, dirp, NULL);
 589         }
 590         tmp = talloc_asprintf(ctx, "%s%s", sDIR->base, result->d_name);
 591         DEBUG(SCANNEDONLY_DEBUG,
 592               ("scannedonly_readdir, check access to %s (sbuf=%p)\n",
 593                tmp,sbuf));
 594
 595         /* even if we don't hide nonscanned files or we allow non scanned
 596            files we call allow_access because it will notify the daemon to
 597            scan these files */
 598         create_synthetic_smb_fname(ctx, tmp,NULL,
 599                                    sbuf?VALID_STAT(*sbuf)?sbuf:NULL:NULL,
 600                                    &smb_fname);
 601         allowed = scannedonly_allow_access(
 602                 handle, sDIR, smb_fname,
 603                 result->d_name,
 604                 sDIR->base, 0,
 605                 STRUCTSCANO(handle->data)->hide_nonscanned_files
 606                 ? STRUCTSCANO(handle->data)->recheck_time_readdir
 607                 : 0,
 608                 STRUCTSCANO(handle->data)->recheck_tries_readdir,
 609                 -1,
 610                 1);
 611         DEBUG(SCANNEDONLY_DEBUG,
 612               ("scannedonly_readdir access to %s (%s) = %d\n", tmp,
 613                result->d_name, allowed));
 614         if (allowed) {
 615                 return result;
 616         }
 617         DEBUG(SCANNEDONLY_DEBUG,
 618               ("hide_nonscanned_files=%d, allow_nonscanned_files=%d\n",
 619                STRUCTSCANO(handle->data)->hide_nonscanned_files,
 620                STRUCTSCANO(handle->data)->allow_nonscanned_files
 621                       ));
 622
 623         if (!STRUCTSCANO(handle->data)->hide_nonscanned_files
 624             || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
 625                 return result;
 626         }
 627
 628         DEBUG(SCANNEDONLY_DEBUG,
 629               ("scannedonly_readdir, readdir listing for %s not "
 630                "allowed, notify user\n", result->d_name));
 631         notify_name = talloc_asprintf(
 632                 ctx,"%s %s",result->d_name,
 633                 STRUCTSCANO(handle->data)->scanning_message);
 634         namelen = strlen(notify_name);
 635         newdirent = (SMB_STRUCT_DIRENT *)TALLOC_ARRAY(
 636                 ctx, char, sizeof(SMB_STRUCT_DIRENT) + namelen + 1);
 637         if (!newdirent) {
 638                 return NULL;
 639         }
 640         memcpy(newdirent, result, sizeof(SMB_STRUCT_DIRENT));
 641         memcpy(&newdirent->d_name, notify_name, namelen + 1);
 642         DEBUG(SCANNEDONLY_DEBUG,
 643               ("scannedonly_readdir, return newdirent at %p with "
 644                "notification %s\n", newdirent, newdirent->d_name));
 645         return newdirent;
 646 }
 647
 648 static void scannedonly_seekdir(struct vfs_handle_struct *handle,
 649                                 SMB_STRUCT_DIR * dirp, long offset)
 650 {
 651         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 652         SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
 653 }
 654
 655 static long scannedonly_telldir(struct vfs_handle_struct *handle,
 656                                 SMB_STRUCT_DIR * dirp)
 657 {
 658         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 659         return SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
 660 }
 661
 662 static void scannedonly_rewinddir(struct vfs_handle_struct *handle,
 663                                   SMB_STRUCT_DIR * dirp)
 664 {
 665         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 666         SMB_VFS_NEXT_REWINDDIR(handle, sDIR->DIR);
 667 }
 668
 669 static int scannedonly_closedir(vfs_handle_struct * handle,
 670                                 SMB_STRUCT_DIR * dirp)
 671 {
 672         int retval;
 673         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 674         flush_sendbuffer(handle);
 675         retval = SMB_VFS_NEXT_CLOSEDIR(handle, sDIR->DIR);
 676         TALLOC_FREE(sDIR);
 677         return retval;
 678 }
 679
 680 static int scannedonly_stat(vfs_handle_struct * handle,
 681                             struct smb_filename *smb_fname)
 682 {
 683         int ret;
 684         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
 685         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_stat: %s returned %d\n",
 686                                   smb_fname->base_name, ret));
 687         if (ret != 0 && errno == ENOENT) {
 688                 TALLOC_CTX *ctx=talloc_tos();
 689                 char *test_base_name, *tmp_base_name = smb_fname->base_name;
 690                 /* possibly this was a fake name (file is being scanned for
 691                    viruses.txt): check for that and create the real name and
 692                    stat the real name */
 693                 test_base_name = real_path_from_notify_path(
 694                         ctx,
 695                         STRUCTSCANO(handle->data),
 696                         smb_fname->base_name);
 697                 if (test_base_name) {
 698                         smb_fname->base_name = test_base_name;
 699                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
 700                         DEBUG(5, ("_stat: %s returned %d\n",
 701                                   test_base_name, ret));
 702                         smb_fname->base_name = tmp_base_name;
 703                 }
 704         }
 705         return ret;
 706 }
 707
 708 static int scannedonly_lstat(vfs_handle_struct * handle,
 709                              struct smb_filename *smb_fname)
 710 {
 711         int ret;
 712         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 713         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_lstat: %s returned %d\n",
 714                                   smb_fname->base_name, ret));
 715         if (ret != 0 && errno == ENOENT) {
 716                 TALLOC_CTX *ctx=talloc_tos();
 717                 char *test_base_name, *tmp_base_name = smb_fname->base_name;
 718                 /* possibly this was a fake name (file is being scanned for
 719                    viruses.txt): check for that and create the real name and
 720                    stat the real name */
 721                 test_base_name = real_path_from_notify_path(
 722                         ctx, STRUCTSCANO(handle->data), smb_fname->base_name);
 723                 if (test_base_name) {
 724                         smb_fname->base_name = test_base_name;
 725                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 726                         DEBUG(5, ("_lstat: %s returned %d\n",
 727                                   test_base_name, ret));
 728                         smb_fname->base_name = tmp_base_name;
 729                 }
 730         }
 731         return ret;
 732 }
 733
 734 static int scannedonly_open(vfs_handle_struct * handle,
 735                             struct smb_filename *smb_fname,
 736                             files_struct * fsp, int flags, mode_t mode)
 737 {
 738         const char *base;
 739         char *tmp, *shortname;
 740         int allowed, write_access = 0;
 741         TALLOC_CTX *ctx=talloc_tos();
 742         /* if open for writing ignore it */
 743         if ((flags & O_ACCMODE) == O_WRONLY) {
 744                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 745         }
 746         if ((flags & O_ACCMODE) == O_RDWR) {
 747                 write_access = 1;
 748         }
 749         /* check if this file is scanned already */
 750         tmp = strrchr(smb_fname->base_name, '/');
 751         if (tmp) {
 752                 base = talloc_strndup(ctx,smb_fname->base_name,
 753                                       (tmp - smb_fname->base_name) + 1);
 754                 shortname = tmp + 1;
 755         } else {
 756                 base = "";
 757                 shortname = (char *)smb_fname->base_name;
 758         }
 759         allowed = scannedonly_allow_access(
 760                 handle, NULL, smb_fname, shortname,
 761                 base,
 762                 write_access,
 763                 STRUCTSCANO(handle->data)->recheck_time_open,
 764                 STRUCTSCANO(handle->data)->recheck_tries_open,
 765                 STRUCTSCANO(handle->data)->recheck_size_open,
 766                 0);
 767         flush_sendbuffer(handle);
 768         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_open: allow=%d for %s\n",
 769                                   allowed, smb_fname->base_name));
 770         if (allowed
 771             || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
 772                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 773         }
 774         errno = EACCES;
 775         return -1;
 776 }
 777
 778 static int scannedonly_close(vfs_handle_struct * handle, files_struct * fsp)
 779 {
 780         /* we only have to notify the scanner
 781            for files that were open readwrite or writable. */
 782         if (fsp->can_write) {
 783                 TALLOC_CTX *ctx = talloc_tos();
 784                 notify_scanner(handle, construct_full_path(
 785                                        ctx,handle,
 786                                        fsp->fsp_name->base_name,false));
 787                 flush_sendbuffer(handle);
 788         }
 789         return SMB_VFS_NEXT_CLOSE(handle, fsp);
 790 }
 791
 792 static int scannedonly_rename(vfs_handle_struct * handle,
 793                               const struct smb_filename *smb_fname_src,
 794                               const struct smb_filename *smb_fname_dst)
 795 {
 796         /* rename the cache file before we pass the actual rename on */
 797         struct smb_filename *smb_fname_src_tmp = NULL;
 798         struct smb_filename *smb_fname_dst_tmp = NULL;
 799         char *cachefile_src, *cachefile_dst;
 800         bool needscandst=false;
 801         int ret;
 802         TALLOC_CTX *ctx = talloc_tos();
 803
 804         /* Setup temporary smb_filename structs. */
 805         cachefile_src = cachefile_name_f_fullpath(
 806                 ctx,
 807                 smb_fname_src->base_name,
 808                 STRUCTSCANO(handle->data)->p_scanned);
 809         cachefile_dst = cachefile_name_f_fullpath(
 810                 ctx,
 811                 smb_fname_dst->base_name,
 812                 STRUCTSCANO(handle->data)->p_scanned);
 813         create_synthetic_smb_fname(ctx, cachefile_src,NULL,NULL,
 814                                    &smb_fname_src_tmp);
 815         create_synthetic_smb_fname(ctx, cachefile_dst,NULL,NULL,
 816                                    &smb_fname_dst_tmp);
 817
 818         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_tmp, smb_fname_dst_tmp);
 819         if (ret == ENOENT) {
 820                 needscandst=true;
 821         } else if (ret != 0) {
 822                 DEBUG(SCANNEDONLY_DEBUG,
 823                       ("failed to rename %s into %s error %d: %s\n", cachefile_src,
 824                        cachefile_dst, ret, strerror(ret)));
 825                 needscandst=true;
 826         }
 827         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
 828         if (ret == 0 && needscandst) {
 829                 notify_scanner(handle, smb_fname_dst->base_name);
 830                 flush_sendbuffer(handle);
 831         }
 832         return ret;
 833 }
 834
 835 static int scannedonly_unlink(vfs_handle_struct * handle,
 836                               const struct smb_filename *smb_fname)
 837 {
 838         /* unlink the 'scanned' file too */
 839         struct smb_filename *smb_fname_cache = NULL;
 840         char * cachefile;
 841         TALLOC_CTX *ctx = talloc_tos();
 842
 843         cachefile = cachefile_name_f_fullpath(
 844                 ctx,
 845                 smb_fname->base_name,
 846                 STRUCTSCANO(handle->data)->p_scanned);
 847         create_synthetic_smb_fname(ctx, cachefile,NULL,NULL,
 848                                    &smb_fname_cache);
 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         SMB_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                         create_synthetic_smb_fname(ctx, fullpath,NULL,NULL,
 894                                                    &smb_fname);
 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                         create_synthetic_smb_fname(ctx, fullpath,NULL,NULL,
 923                                                    &smb_fname);
 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         handle->data = (void *)so;
 947         handle->free_data = free_scannedonly_data;
 948         so->gsendbuffer[0]='\0';
 949         so->domain_socket =
 950                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 951                              "domain_socket", True);
 952         so->socketname = lp_parm_const_string(SNUM(handle->conn),
 953                                              "scannedonly", "socketname",
 954                                              "/var/lib/scannedonly/scan");
 955
 956         so->portnum =
 957                 lp_parm_int(SNUM(handle->conn), "scannedonly", "portnum",
 958                             2020);
 959         so->scanhost = lp_parm_const_string(SNUM(handle->conn),
 960                                              "scannedonly", "scanhost",
 961                                              "localhost");
 962
 963         so->show_special_files =
 964                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 965                              "show_special_files", True);
 966         so->rm_hidden_files_on_rmdir =
 967                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 968                              "rm_hidden_files_on_rmdir", True);
 969         so->hide_nonscanned_files =
 970                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 971                              "hide_nonscanned_files", False);
 972         so->allow_nonscanned_files =
 973                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 974                              "allow_nonscanned_files", False);
 975         so->scanning_message = lp_parm_const_string(SNUM(handle->conn),
 976                                              "scannedonly",
 977                                              "scanning_message",
 978                                              "is being scanned for viruses");
 979         so->scanning_message_len = strlen(so->scanning_message);
 980         so->recheck_time_open =
 981                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 982                             "recheck_time_open", 50);
 983         so->recheck_tries_open =
 984                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 985                             "recheck_tries_open", 100);
 986         so->recheck_size_open =
 987                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 988                             "recheck_size_open", 100);
 989         so->recheck_time_readdir =
 990                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 991                             "recheck_time_readdir", 50);
 992         so->recheck_tries_readdir =
 993                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 994                             "recheck_tries_readdir", 20);
 995
 996         so->p_scanned =
 997                 lp_parm_const_string(SNUM(handle->conn),
 998                                              "scannedonly",
 999                                              "pref_scanned",
1000                                              ".scanned:");
1001         so->p_virus =
1002                 lp_parm_const_string(SNUM(handle->conn),
1003                                              "scannedonly",
1004                                              "pref_virus",
1005                                              ".virus:");
1006         so->p_failed =
1007                 lp_parm_const_string(SNUM(handle->conn),
1008                                              "scannedonly",
1009                                              "pref_failed",
1010                                              ".failed:");
1011         connect_to_scanner(handle);
1012
1013         return SMB_VFS_NEXT_CONNECT(handle, service, user);
1014 }
1015
1016 /* VFS operations structure */
1017 static struct vfs_fn_pointers vfs_scannedonly_fns = {
1018         .opendir = scannedonly_opendir,
1019         .fdopendir = scannedonly_fdopendir,
1020         .readdir = scannedonly_readdir,
1021         .seekdir = scannedonly_seekdir,
1022         .telldir = scannedonly_telldir,
1023         .rewind_dir = scannedonly_rewinddir,
1024         .closedir = scannedonly_closedir,
1025         .rmdir = scannedonly_rmdir,
1026         .stat = scannedonly_stat,
1027         .lstat = scannedonly_lstat,
1028         .open_fn = scannedonly_open,
1029         .close_fn = scannedonly_close,
1030         .rename = scannedonly_rename,
1031         .unlink = scannedonly_unlink,
1032         .connect_fn = scannedonly_connect
1033 };
1034
1035 NTSTATUS vfs_scannedonly_init(void)
1036 {
1037         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "scannedonly",
1038                                 &vfs_scannedonly_fns);
1039 }