source3/modules/vfs_scannedonly.c

   1 /*
   2  * scannedonly VFS module for Samba 3.5
   3  *
   4  * Copyright 2007,2008,2009 (C) Olivier Sessink
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  * ABOUT SCANNEDONLY
  21  *
  22  * scannedonly implements a 'filter' like vfs module that talks over a
  23  * unix domain socket or over UDP to a anti-virus engine.
  24  *
  25  * files that are clean have a corresponding .scanned:{filename} file
  26  * in the same directory. So why the .scanned: files? They take up
  27  * only an inode, because they are 0 bytes. To test if the file is
  28  * scanned only a stat() call on the filesystem is needed which is
  29  * very quick compared to a database lookup. All modern filesystems
  30  * use database technology such as balanced trees for lookups anyway.
  31  * The number of inodes in modern filesystems is also not limiting
  32  * anymore. The .scanned: files are also easy scriptable. You can
  33  * remove them with a simple find command or create them with a
  34  * simple touch command. Extended filesystem attributes have similar
  35  * properties, but are not supported on all filesystems, so that
  36  * would limit the usage of the module (and attributes are not as
  37  * easily scriptable)
  38  *
  39  * files that are not clean are sent to the AV-engine. Only the
  40  * filename is sent over the socket. The protocol is very simple:
  41  * a newline separated list of filenames inside each datagram.
  42  *
  43  * a file AV-scan may be requested multiple times, the AV-engine
  44  * should also check if the file has been scanned already. Requests
  45  * can also be dropped by the AV-engine (and we thus don't need the
  46  * reliability of TCP).
  47  *
  48  */
  49
  50 #include "includes.h"
  51
  52 #include "config.h"
  53
  54 #define SENDBUFFERSIZE 1450
  55
  56 struct Tscannedonly {
  57         int socket;
  58         int domain_socket;
  59         int portnum;
  60         int scanning_message_len;
  61         int recheck_time_open;
  62         int recheck_tries_open;
  63         int recheck_size_open;
  64         int recheck_time_readdir;
  65         int recheck_tries_readdir;
  66         bool show_special_files;
  67         bool rm_hidden_files_on_rmdir;
  68         bool hide_nonscanned_files;
  69         bool allow_nonscanned_files;
  70         char *socketname;
  71         char *scanhost;
  72         char *scanning_message;
  73         char *p_scanned; /* prefix for scanned files */
  74         char *p_virus; /* prefix for virus containing files */
  75         char *p_failed; /* prefix for failed to scan files */
  76         char gsendbuffer[SENDBUFFERSIZE + 1];
  77 };
  78
  79 #define STRUCTSCANO(var) ((struct Tscannedonly *)var)
  80
  81 struct scannedonly_DIR {
  82         char *base;
  83         int notify_loop_done;
  84         SMB_STRUCT_DIR *DIR;
  85 };
  86 #define SCANNEDONLY_DEBUG 9
  87 /*********************/
  88 /* utility functions */
  89 /*********************/
  90
  91 static char *real_path_from_notify_path(TALLOC_CTX *ctx,
  92                                         struct Tscannedonly *so,
  93                                         const char *path)
  94 {
  95         char *name;
  96         int len, pathlen;
  97
  98         name = strrchr(path, '/');
  99         if (!name) {
 100                 return NULL;
 101         }
 102         pathlen = name - path;
 103         name++;
 104         len = strlen(name);
 105         if (len <= so->scanning_message_len) {
 106                 return NULL;
 107         }
 108
 109         if (strcmp(name + (len - so->scanning_message_len),
 110                    so->scanning_message) != 0) {
 111                 return NULL;
 112         }
 113
 114         return talloc_strndup(ctx,path,
 115                               pathlen + len - so->scanning_message_len);
 116 }
 117
 118 static char *cachefile_name(TALLOC_CTX *ctx,
 119                             const char *shortname,
 120                             const char *base,
 121                             const char *p_scanned)
 122 {
 123         return talloc_asprintf(ctx, "%s%s%s", base, p_scanned, shortname);
 124 }
 125
 126 static char *name_w_ending_slash(TALLOC_CTX *ctx, const char *name)
 127 {
 128         int len = strlen(name);
 129         if (name[len - 1] == '/') {
 130                 return talloc_strdup(ctx,name);
 131         } else {
 132                 return talloc_asprintf(ctx, "%s/", name);
 133         }
 134 }
 135
 136 static char *cachefile_name_f_fullpath(TALLOC_CTX *ctx,
 137                                        const char *fullpath,
 138                                        const char *p_scanned)
 139 {
 140         const char *base;
 141         char *tmp, *cachefile, *shortname;
 142         tmp = strrchr(fullpath, '/');
 143         if (tmp) {
 144                 base = talloc_strndup(ctx, fullpath, (tmp - fullpath) + 1);
 145                 shortname = tmp + 1;
 146         } else {
 147                 base = "";
 148                 shortname = (char *)fullpath;
 149         }
 150         cachefile = cachefile_name(ctx, shortname, base, p_scanned);
 151         DEBUG(SCANNEDONLY_DEBUG,
 152               ("cachefile_name_f_fullpath cachefile=%s\n", cachefile));
 153         return cachefile;
 154 }
 155
 156 static char *path_plus_name(TALLOC_CTX *ctx, const char *base,
 157                             const char *filename)
 158 {
 159         return talloc_asprintf(ctx, "%s%s", base,filename);
 160 }
 161
 162 static char *construct_full_path(TALLOC_CTX *ctx, vfs_handle_struct * handle,
 163                                  const char *somepath, bool ending_slash)
 164 {
 165         char *tmp;
 166
 167         if (!somepath) {
 168                 return NULL;
 169         }
 170         if (somepath[0] == '/') {
 171                 if (ending_slash) {
 172                         return name_w_ending_slash(ctx,somepath);
 173                 }
 174                 return talloc_strdup(ctx,somepath);
 175         }
 176         tmp=(char *)somepath;
 177         if (tmp[0]=='.'&&tmp[1]=='/') {
 178                 tmp+=2;
 179         }
 180         /* vfs_GetWd() seems to return a path with a slash */
 181         if (ending_slash) {
 182                 return talloc_asprintf(ctx, "%s%s/",
 183                                        vfs_GetWd(ctx, handle->conn),tmp);
 184         }
 185         return talloc_asprintf(ctx, "%s%s",
 186                                vfs_GetWd(ctx, handle->conn),tmp);
 187 }
 188
 189 static int connect_to_scanner(vfs_handle_struct * handle)
 190 {
 191         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
 192
 193         if (so->domain_socket) {
 194                 struct sockaddr_un saun;
 195                 DEBUG(SCANNEDONLY_DEBUG, ("socket=%s\n", so->socketname));
 196                 if ((so->socket = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
 197                         DEBUG(2, ("failed to create socket %s\n",
 198                                   so->socketname));
 199                         return -1;
 200                 }
 201                 saun.sun_family = AF_UNIX;
 202                 strncpy(saun.sun_path, so->socketname,
 203                         sizeof(saun.sun_path) - 1);
 204                 if (connect(so->socket, (struct sockaddr *)(void *)&saun,
 205                             SUN_LEN(&saun)) < 0) {
 206                         DEBUG(2, ("failed to connect to socket %s\n",
 207                                   so->socketname));
 208                         return -1;
 209                 }
 210                 DEBUG(SCANNEDONLY_DEBUG,("bound %s to socket %d\n",
 211                                          saun.sun_path, so->socket));
 212
 213         } else {
 214                 so->socket = open_udp_socket(so->scanhost, so->portnum);
 215                 if (so->socket < 0) {
 216                         DEBUG(2,("failed to open UDP socket to %s:%d\n",
 217                                  so->scanhost,so->portnum));
 218                         return -1;
 219                 }
 220         }
 221
 222         {/* increasing the socket buffer is done because we have large bursts
 223             of UDP packets or DGRAM's on a domain socket whenever we hit a
 224             large directory with lots of unscanned files. */
 225                 int sndsize;
 226                 socklen_t size = sizeof(int);
 227                 getsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
 228                            (char *)&sndsize, &size);
 229                 DEBUG(SCANNEDONLY_DEBUG, ("current socket buffer size=%d\n",
 230                                           sndsize));
 231                 sndsize = 262144;
 232                 if (setsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
 233                                (char *)&sndsize,
 234                                (int)sizeof(sndsize)) != 0) {
 235                         DEBUG(SCANNEDONLY_DEBUG,
 236                               ("error setting socket buffer %s (%d)\n",
 237                                strerror(errno), errno));
 238                 }
 239         }
 240         set_blocking(so->socket, false);
 241         return 0;
 242 }
 243
 244 static void flush_sendbuffer(vfs_handle_struct * handle)
 245 {
 246         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
 247         int ret, len, loop = 10;
 248         if (so->gsendbuffer[0] == '\0') {
 249                 return;
 250         }
 251
 252         do {
 253                 loop--;
 254                 len = strlen(so->gsendbuffer);
 255                 ret = send(so->socket, so->gsendbuffer, len, MSG_DONTWAIT);
 256                 if (ret == len) {
 257                         so->gsendbuffer[0] = '\0';
 258                         break;
 259                 }
 260                 if (ret == -1) {
 261                         DEBUG(3,("scannedonly flush_sendbuffer: "
 262                                  "error sending on socket %d to scanner:"
 263                                  " %s (%d)\n",
 264                                  so->socket, strerror(errno), errno));
 265                         if (errno == ECONNREFUSED || errno == ENOTCONN
 266                             || errno == ECONNRESET) {
 267                                 if (connect_to_scanner(handle) == -1)
 268                                         break;  /* connecting fails, abort */
 269                                 /* try again */
 270                         } else if (errno != EINTR) {
 271                                 /* on EINTR we just try again, all remaining
 272                                    other errors we log the error
 273                                    and try again ONCE */
 274                                 loop = 1;
 275                                 DEBUG(3,("scannedonly flush_sendbuffer: "
 276                                          "error sending data to scanner: %s "
 277                                          "(%d)\n", strerror(errno), errno));
 278                         }
 279                 } else {
 280                         /* --> partial write: Resend all filenames that were
 281                            not or not completely written. a partial filename
 282                            written means the filename will not arrive correctly,
 283                            so resend it completely */
 284                         int pos = 0;
 285                         while (pos < len) {
 286                                 char *tmp = strchr(so->gsendbuffer+pos, '\n');
 287                                 if (tmp && tmp - so->gsendbuffer < ret)
 288                                         pos = tmp - so->gsendbuffer + 1;
 289                                 else
 290                                         break;
 291                         }
 292                         memmove(so->gsendbuffer, so->gsendbuffer + pos,
 293                                 SENDBUFFERSIZE - ret);
 294                         /* now try again */
 295                 }
 296         } while (loop > 0);
 297
 298         if (so->gsendbuffer[0] != '\0') {
 299                 DEBUG(2,
 300                       ("scannedonly flush_sendbuffer: "
 301                        "failed to send files to AV scanner, "
 302                        "discarding files."));
 303                 so->gsendbuffer[0] = '\0';
 304         }
 305 }
 306
 307 static void notify_scanner(vfs_handle_struct * handle, const char *scanfile)
 308 {
 309         char *tmp;
 310         int tmplen, gsendlen;
 311         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
 312         TALLOC_CTX *ctx=talloc_tos();
 313         if (scanfile[0] != '/') {
 314                 tmp = construct_full_path(ctx,handle, scanfile, false);
 315         } else {
 316                 tmp = (char *)scanfile;
 317         }
 318         tmplen = strlen(tmp);
 319         gsendlen = strlen(so->gsendbuffer);
 320         DEBUG(SCANNEDONLY_DEBUG,
 321               ("scannedonly notify_scanner: tmp=%s, tmplen=%d, gsendlen=%d\n",
 322                tmp, tmplen, gsendlen));
 323         if (gsendlen + tmplen >= SENDBUFFERSIZE) {
 324                 flush_sendbuffer(handle);
 325         }
 326         strlcat(so->gsendbuffer, tmp, SENDBUFFERSIZE + 1);
 327         strlcat(so->gsendbuffer, "\n", SENDBUFFERSIZE + 1);
 328 }
 329
 330 static bool is_scannedonly_file(struct Tscannedonly *so, const char *shortname)
 331 {
 332         if (shortname[0]!='.') {
 333                 return false;
 334         }
 335         if (strncmp(shortname, so->p_scanned, strlen(so->p_scanned)) == 0) {
 336                 return true;
 337         }
 338         if (strncmp(shortname, so->p_virus, strlen(so->p_virus)) == 0) {
 339                 return true;
 340         }
 341         if (strncmp(shortname, so->p_failed, strlen(so->p_failed)) == 0) {
 342                 return true;
 343         }
 344         return false;
 345 }
 346
 347 static bool timespec_is_newer(struct timespec *base, struct timespec *test)
 348 {
 349         return timespec_compare(base,test) < 0;
 350 }
 351
 352 /*
 353 vfs_handle_struct *handle the scannedonly handle
 354 scannedonly_DIR * sDIR the scannedonly struct if called from _readdir()
 355 or NULL
 356 fullpath is a full path starting from / or a relative path to the
 357 current working directory
 358 shortname is the filename without directory components
 359 basename, is the directory without file name component
 360 allow_nonexistant return TRUE if stat() on the requested file fails
 361 recheck_time, the time in milliseconds to wait for the daemon to
 362 create a .scanned file
 363 recheck_tries, the number of tries to wait
 364 recheck_size, size in Kb of files that should not be waited for
 365 loop : boolean if we should try to loop over all files in the directory
 366 and send a notify to the scanner for all files that need scanning
 367 */
 368 static bool scannedonly_allow_access(vfs_handle_struct * handle,
 369                                      struct scannedonly_DIR *sDIR,
 370                                      struct smb_filename *smb_fname,
 371                                      const char *shortname,
 372                                      const char *base_name,
 373                                      int allow_nonexistant,
 374                                      int recheck_time, int recheck_tries,
 375                                      int recheck_size, int loop)
 376 {
 377         struct smb_filename *cache_smb_fname;
 378         TALLOC_CTX *ctx=talloc_tos();
 379         char *cachefile;
 380         int retval;
 381         int didloop;
 382         DEBUG(SCANNEDONLY_DEBUG,
 383               ("smb_fname->base_name=%s, shortname=%s, base_name=%s\n"
 384                ,smb_fname->base_name,shortname,base_name));
 385
 386         if (ISDOT(shortname) || ISDOTDOT(shortname)) {
 387                 return true;
 388         }
 389         if (is_scannedonly_file(STRUCTSCANO(handle->data), shortname)) {
 390                 DEBUG(SCANNEDONLY_DEBUG,
 391                       ("scannedonly_allow_access, %s is a scannedonly file, "
 392                        "return 0\n", shortname));
 393                 return false;
 394         }
 395
 396         if (!VALID_STAT(smb_fname->st)) {
 397                 DEBUG(SCANNEDONLY_DEBUG,("stat %s\n",smb_fname->base_name));
 398                 retval = SMB_VFS_NEXT_STAT(handle, smb_fname);
 399                 if (retval != 0) {
 400                         /* failed to stat this file?!? --> hide it */
 401                         DEBUG(SCANNEDONLY_DEBUG,("no valid stat, return"
 402                                                  " allow_nonexistant=%d\n",
 403                                                  allow_nonexistant));
 404                         return allow_nonexistant;
 405                 }
 406         }
 407         if (!S_ISREG(smb_fname->st.st_ex_mode)) {
 408                 DEBUG(SCANNEDONLY_DEBUG,
 409                       ("%s is not a regular file, ISDIR=%d\n",
 410                        smb_fname->base_name,
 411                        S_ISDIR(smb_fname->st.st_ex_mode)));
 412                 return (STRUCTSCANO(handle->data)->
 413                         show_special_files ||
 414                         S_ISDIR(smb_fname->st.st_ex_mode));
 415         }
 416         if (smb_fname->st.st_ex_size == 0) {
 417                 DEBUG(SCANNEDONLY_DEBUG,("empty file, return 1\n"));
 418                 return true;    /* empty files cannot contain viruses ! */
 419         }
 420         cachefile = cachefile_name(ctx,
 421                                    shortname,
 422                                    base_name,
 423                                    STRUCTSCANO(handle->data)->p_scanned);
 424         create_synthetic_smb_fname(ctx, cachefile,NULL,NULL,&cache_smb_fname);
 425         if (!VALID_STAT(cache_smb_fname->st)) {
 426                 retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
 427         }
 428         if (retval == 0 && VALID_STAT(cache_smb_fname->st)) {
 429                 if (timespec_is_newer(&smb_fname->st.st_ex_mtime,
 430                                       &cache_smb_fname->st.st_ex_mtime)) {
 431                         talloc_free(cache_smb_fname);
 432                         return true;
 433                 }
 434                 /* no cachefile or too old */
 435                 SMB_VFS_NEXT_UNLINK(handle, cache_smb_fname);
 436                 retval = -1;
 437         }
 438
 439         notify_scanner(handle, smb_fname->base_name);
 440
 441         didloop = 0;
 442         if (loop && sDIR && !sDIR->notify_loop_done) {
 443                 /* check the rest of the directory and notify the
 444                    scanner if some file needs scanning */
 445                 long offset;
 446                 SMB_STRUCT_DIRENT *dire;
 447
 448                 offset = SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
 449                 dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, NULL);
 450                 while (dire) {
 451                         char *fpath2;
 452                         struct smb_filename *smb_fname2;
 453                         fpath2 = path_plus_name(ctx,base_name, dire->d_name);
 454                         DEBUG(SCANNEDONLY_DEBUG,
 455                               ("scannedonly_allow_access in loop, "
 456                                "found %s\n", fpath2));
 457                         create_synthetic_smb_fname(ctx, fpath2,NULL,NULL,
 458                                                    &smb_fname2);
 459                         scannedonly_allow_access(handle, NULL,
 460                                                  smb_fname2,
 461                                                  dire->d_name,
 462                                                  base_name, 0, 0, 0, 0, 0);
 463                         talloc_free(fpath2);
 464                         talloc_free(smb_fname2);
 465                         dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR,NULL);
 466                 }
 467                 sDIR->notify_loop_done = 1;
 468                 didloop = 1;
 469                 SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
 470         }
 471         if (recheck_time > 0
 472             && ((recheck_size > 0
 473                  && smb_fname->st.st_ex_size < (1024 * recheck_size))
 474                 || didloop)) {
 475                 int i = 0;
 476                 flush_sendbuffer(handle);
 477                 while (retval != 0      /*&& errno == ENOENT */
 478                        && i < recheck_tries) {
 479                         struct timespec req = { 0, recheck_time * 10000 };
 480                         DEBUG(SCANNEDONLY_DEBUG,
 481                               ("scannedonly_allow_access, wait (try=%d "
 482                                "(max %d), %d ms) for %s\n",
 483                                i, recheck_tries,
 484                                recheck_time, cache_smb_fname->base_name));
 485                         nanosleep(&req, NULL);
 486                         retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
 487                         i++;
 488                 }
 489         }
 490         /* still no cachefile, or still too old, return 0 */
 491         if (retval != 0
 492             || !timespec_is_newer(&smb_fname->st.st_ex_mtime,
 493                                   &cache_smb_fname->st.st_ex_mtime)) {
 494                 DEBUG(SCANNEDONLY_DEBUG,
 495                       ("retval=%d, return 0\n",retval));
 496                 return false;
 497         }
 498         return true;
 499 }
 500
 501 /*********************/
 502 /* VFS functions     */
 503 /*********************/
 504
 505 static SMB_STRUCT_DIR *scannedonly_opendir(vfs_handle_struct * handle,
 506                                            const char *fname,
 507                                            const char *mask, uint32 attr)
 508 {
 509         SMB_STRUCT_DIR *DIRp;
 510         struct scannedonly_DIR *sDIR;
 511
 512         DIRp = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 513         if (!DIRp) {
 514                 return NULL;
 515         }
 516
 517         sDIR = TALLOC_P(NULL, struct scannedonly_DIR);
 518         if (fname[0] != '/') {
 519                 sDIR->base = construct_full_path(sDIR,handle, fname, true);
 520         } else {
 521                 sDIR->base = name_w_ending_slash(sDIR, fname);
 522         }
 523         sDIR->DIR = DIRp;
 524         sDIR->notify_loop_done = 0;
 525         return (SMB_STRUCT_DIR *) sDIR;
 526 }
 527
 528 static SMB_STRUCT_DIRENT *scannedonly_readdir(vfs_handle_struct *handle,
 529                                               SMB_STRUCT_DIR * dirp,
 530                                               SMB_STRUCT_STAT *sbuf)
 531 {
 532         SMB_STRUCT_DIRENT *result;
 533         int allowed = 0;
 534         char *tmp;
 535         struct smb_filename *smb_fname;
 536         char *notify_name;
 537         int namelen;
 538         SMB_STRUCT_DIRENT *newdirent;
 539         TALLOC_CTX *ctx=talloc_tos();
 540
 541         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 542         if (!dirp) {
 543                 return NULL;
 544         }
 545
 546         result = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, sbuf);
 547
 548         if (!result)
 549                 return NULL;
 550
 551         if (is_scannedonly_file(STRUCTSCANO(handle->data), result->d_name)) {
 552                 DEBUG(SCANNEDONLY_DEBUG,
 553                       ("scannedonly_readdir, %s is a scannedonly file, "
 554                        "skip to next entry\n", result->d_name));
 555                 return scannedonly_readdir(handle, dirp, NULL);
 556         }
 557
 558         tmp = path_plus_name(ctx,sDIR->base, result->d_name);
 559         DEBUG(SCANNEDONLY_DEBUG,
 560               ("scannedonly_readdir, check access to %s (sbuf=%p)\n",
 561                tmp,sbuf));
 562
 563         /* even if we don't hide nonscanned files or we allow non scanned
 564            files we call allow_access because it will notify the daemon to
 565            scan these files */
 566         create_synthetic_smb_fname(ctx, tmp,NULL,
 567                                    sbuf?VALID_STAT(*sbuf)?sbuf:NULL:NULL,
 568                                    &smb_fname);
 569         allowed = scannedonly_allow_access(
 570                 handle, sDIR, smb_fname,
 571                 result->d_name,
 572                 sDIR->base, 0,
 573                 STRUCTSCANO(handle->data)->hide_nonscanned_files
 574                 ? STRUCTSCANO(handle->data)->recheck_time_readdir
 575                 : 0,
 576                 STRUCTSCANO(handle->data)->recheck_tries_readdir,
 577                 -1,
 578                 1);
 579         DEBUG(SCANNEDONLY_DEBUG,
 580               ("scannedonly_readdir access to %s (%s) = %d\n", tmp,
 581                result->d_name, allowed));
 582         if (allowed) {
 583                 return result;
 584         }
 585         DEBUG(SCANNEDONLY_DEBUG,
 586               ("hide_nonscanned_files=%d, allow_nonscanned_files=%d\n",
 587                STRUCTSCANO(handle->data)->hide_nonscanned_files,
 588                STRUCTSCANO(handle->data)->allow_nonscanned_files
 589                       ));
 590
 591         if (!STRUCTSCANO(handle->data)->hide_nonscanned_files
 592             || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
 593                 return result;
 594         }
 595
 596         DEBUG(SCANNEDONLY_DEBUG,
 597               ("scannedonly_readdir, readdir listing for %s not "
 598                "allowed, notify user\n", result->d_name));
 599         notify_name = talloc_asprintf(
 600                 ctx,"%s %s",result->d_name,
 601                 STRUCTSCANO(handle->data)->scanning_message);
 602         namelen = strlen(notify_name);
 603         newdirent = (SMB_STRUCT_DIRENT *)TALLOC_ARRAY(
 604                 ctx, char, sizeof(SMB_STRUCT_DIRENT) + namelen + 1);
 605         if (!newdirent) {
 606                 return NULL;
 607         }
 608         memcpy(newdirent, result, sizeof(SMB_STRUCT_DIRENT));
 609         memcpy(&newdirent->d_name, notify_name, namelen + 1);
 610         DEBUG(SCANNEDONLY_DEBUG,
 611               ("scannedonly_readdir, return newdirent at %p with "
 612                "notification %s\n", newdirent, newdirent->d_name));
 613         return newdirent;
 614 }
 615
 616 static void scannedonly_seekdir(struct vfs_handle_struct *handle,
 617                                 SMB_STRUCT_DIR * dirp, long offset)
 618 {
 619         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 620         SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
 621 }
 622
 623 static long scannedonly_telldir(struct vfs_handle_struct *handle,
 624                                 SMB_STRUCT_DIR * dirp)
 625 {
 626         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 627         return SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
 628 }
 629
 630 static void scannedonly_rewinddir(struct vfs_handle_struct *handle,
 631                                   SMB_STRUCT_DIR * dirp)
 632 {
 633         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 634         SMB_VFS_NEXT_REWINDDIR(handle, sDIR->DIR);
 635 }
 636
 637 static int scannedonly_closedir(vfs_handle_struct * handle,
 638                                 SMB_STRUCT_DIR * dirp)
 639 {
 640         int retval;
 641         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 642         flush_sendbuffer(handle);
 643         retval = SMB_VFS_NEXT_CLOSEDIR(handle, sDIR->DIR);
 644         TALLOC_FREE(sDIR);
 645         return retval;
 646 }
 647
 648 static int scannedonly_stat(vfs_handle_struct * handle,
 649                             struct smb_filename *smb_fname)
 650 {
 651         int ret;
 652         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
 653         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_stat: %s returned %d\n",
 654                                   smb_fname->base_name, ret));
 655         if (ret != 0 && errno == ENOENT) {
 656                 TALLOC_CTX *ctx=talloc_tos();
 657                 char *test_base_name, *tmp_base_name = smb_fname->base_name;
 658                 /* possibly this was a fake name (file is being scanned for
 659                    viruses.txt): check for that and create the real name and
 660                    stat the real name */
 661                 test_base_name = real_path_from_notify_path(
 662                         ctx,
 663                         STRUCTSCANO(handle->data),
 664                         smb_fname->base_name);
 665                 if (test_base_name) {
 666                         smb_fname->base_name = test_base_name;
 667                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
 668                         DEBUG(5, ("_stat: %s returned %d\n",
 669                                   test_base_name, ret));
 670                         smb_fname->base_name = tmp_base_name;
 671                 }
 672         }
 673         return ret;
 674 }
 675
 676 static int scannedonly_lstat(vfs_handle_struct * handle,
 677                              struct smb_filename *smb_fname)
 678 {
 679         int ret;
 680         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 681         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_lstat: %s returned %d\n",
 682                                   smb_fname->base_name, ret));
 683         if (ret != 0 && errno == ENOENT) {
 684                 TALLOC_CTX *ctx=talloc_tos();
 685                 char *test_base_name, *tmp_base_name = smb_fname->base_name;
 686                 /* possibly this was a fake name (file is being scanned for
 687                    viruses.txt): check for that and create the real name and
 688                    stat the real name */
 689                 test_base_name = real_path_from_notify_path(
 690                         ctx, STRUCTSCANO(handle->data), smb_fname->base_name);
 691                 if (test_base_name) {
 692                         smb_fname->base_name = test_base_name;
 693                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 694                         DEBUG(5, ("_lstat: %s returned %d\n",
 695                                   test_base_name, ret));
 696                         smb_fname->base_name = tmp_base_name;
 697                 }
 698         }
 699         return ret;
 700 }
 701
 702 static int scannedonly_open(vfs_handle_struct * handle,
 703                             struct smb_filename *smb_fname,
 704                             files_struct * fsp, int flags, mode_t mode)
 705 {
 706         const char *base;
 707         char *tmp, *shortname;
 708         int allowed, write_access = 0;
 709         TALLOC_CTX *ctx=talloc_tos();
 710         /* if open for writing ignore it */
 711         if ((flags & O_ACCMODE) == O_WRONLY) {
 712                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 713         }
 714         if ((flags & O_ACCMODE) == O_RDWR) {
 715                 write_access = 1;
 716         }
 717         /* check if this file is scanned already */
 718         tmp = strrchr(smb_fname->base_name, '/');
 719         if (tmp) {
 720                 base = talloc_strndup(ctx,smb_fname->base_name,
 721                                       (tmp - smb_fname->base_name) + 1);
 722                 shortname = tmp + 1;
 723         } else {
 724                 base = "";
 725                 shortname = (char *)smb_fname->base_name;
 726         }
 727         allowed = scannedonly_allow_access(
 728                 handle, NULL, smb_fname, shortname,
 729                 base,
 730                 write_access,
 731                 STRUCTSCANO(handle->data)->recheck_time_open,
 732                 STRUCTSCANO(handle->data)->recheck_tries_open,
 733                 STRUCTSCANO(handle->data)->recheck_size_open,
 734                 0);
 735         flush_sendbuffer(handle);
 736         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_open: allow=%d for %s\n",
 737                                   allowed, smb_fname->base_name));
 738         if (allowed
 739             || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
 740                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 741         }
 742         errno = EACCES;
 743         return -1;
 744 }
 745
 746 static int scannedonly_close(vfs_handle_struct * handle, files_struct * fsp)
 747 {
 748         /* we only have to notify the scanner
 749            for files that were open readwrite or writable. */
 750         if (fsp->can_write) {
 751                 TALLOC_CTX *ctx = talloc_tos();
 752                 notify_scanner(handle, construct_full_path(
 753                                        ctx,handle,
 754                                        fsp->fsp_name->base_name,false));
 755                 flush_sendbuffer(handle);
 756         }
 757         return SMB_VFS_NEXT_CLOSE(handle, fsp);
 758 }
 759
 760 static int scannedonly_rename(vfs_handle_struct * handle,
 761                               const struct smb_filename *smb_fname_src,
 762                               const struct smb_filename *smb_fname_dst)
 763 {
 764         /* rename the cache file before we pass the actual rename on */
 765         struct smb_filename *smb_fname_src_tmp = NULL;
 766         struct smb_filename *smb_fname_dst_tmp = NULL;
 767         char *cachefile_src, *cachefile_dst;
 768         TALLOC_CTX *ctx = talloc_tos();
 769
 770         /* Setup temporary smb_filename structs. */
 771         cachefile_src = cachefile_name_f_fullpath(
 772                 ctx,
 773                 smb_fname_src->base_name,
 774                 STRUCTSCANO(handle->data)->p_scanned);
 775         cachefile_dst = cachefile_name_f_fullpath(
 776                 ctx,
 777                 smb_fname_dst->base_name,
 778                 STRUCTSCANO(handle->data)->p_scanned);
 779
 780         create_synthetic_smb_fname(ctx, cachefile_src,NULL,NULL,
 781                                    &smb_fname_src_tmp);
 782         create_synthetic_smb_fname(ctx, cachefile_dst,NULL,NULL,
 783                                    &smb_fname_dst_tmp);
 784
 785         if (SMB_VFS_NEXT_RENAME(handle, smb_fname_src_tmp, smb_fname_dst_tmp)
 786             != 0) {
 787                 DEBUG(SCANNEDONLY_DEBUG,
 788                       ("failed to rename %s into %s\n", cachefile_src,
 789                        cachefile_dst));
 790         }
 791         return SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
 792 }
 793
 794 static int scannedonly_unlink(vfs_handle_struct * handle,
 795                               const struct smb_filename *smb_fname)
 796 {
 797         /* unlink the 'scanned' file too */
 798         struct smb_filename *smb_fname_cache = NULL;
 799         char * cachefile;
 800         TALLOC_CTX *ctx = talloc_tos();
 801
 802         cachefile = cachefile_name_f_fullpath(
 803                 ctx,
 804                 smb_fname->base_name,
 805                 STRUCTSCANO(handle->data)->p_scanned);
 806         create_synthetic_smb_fname(ctx, cachefile,NULL,NULL,
 807                                    &smb_fname_cache);
 808         if (SMB_VFS_NEXT_UNLINK(handle, smb_fname_cache) != 0) {
 809                 DEBUG(SCANNEDONLY_DEBUG, ("_unlink: failed to unlink %s\n",
 810                                           smb_fname_cache->base_name));
 811         }
 812         return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 813 }
 814
 815 static int scannedonly_rmdir(vfs_handle_struct * handle, const char *path)
 816 {
 817         /* if there are only .scanned: .virus: or .failed: files, we delete
 818            those, because the client cannot see them */
 819         DIR *dirp;
 820         SMB_STRUCT_DIRENT *dire;
 821         TALLOC_CTX *ctx = talloc_tos();
 822         bool only_deletable_files = true, have_files = false;
 823         char *path_w_slash;
 824
 825         if (!STRUCTSCANO(handle->data)->rm_hidden_files_on_rmdir)
 826                 return SMB_VFS_NEXT_RMDIR(handle, path);
 827
 828         path_w_slash = name_w_ending_slash(ctx,path);
 829         dirp = SMB_VFS_NEXT_OPENDIR(handle, path, NULL, 0);
 830         while ((dire = SMB_VFS_NEXT_READDIR(handle, dirp, NULL)) != NULL) {
 831                 if (ISDOT(dire->d_name) || ISDOTDOT(dire->d_name)) {
 832                         continue;
 833                 }
 834                 have_files = true;
 835                 if (!is_scannedonly_file(STRUCTSCANO(handle->data),
 836                                          dire->d_name)) {
 837                         struct smb_filename *smb_fname = NULL;
 838                         char *fullpath;
 839                         int retval;
 840
 841                         if (STRUCTSCANO(handle->data)->show_special_files) {
 842                                 only_deletable_files = false;
 843                                 break;
 844                         }
 845                         /* stat the file and see if it is a
 846                            special file */
 847                         fullpath = path_plus_name(ctx,path_w_slash,
 848                                                   dire->d_name);
 849                         create_synthetic_smb_fname(ctx, fullpath,NULL,NULL,
 850                                                    &smb_fname);
 851                         retval = SMB_VFS_NEXT_STAT(handle, smb_fname);
 852                         if (retval == 0
 853                             && S_ISREG(smb_fname->st.st_ex_mode)) {
 854                                 only_deletable_files = false;
 855                         }
 856                         TALLOC_FREE(fullpath);
 857                         TALLOC_FREE(smb_fname);
 858                         break;
 859                 }
 860         }
 861         DEBUG(SCANNEDONLY_DEBUG,
 862               ("path=%s, have_files=%d, only_deletable_files=%d\n",
 863                path, have_files, only_deletable_files));
 864         if (have_files && only_deletable_files) {
 865                 DEBUG(SCANNEDONLY_DEBUG,
 866                       ("scannedonly_rmdir, remove leftover scannedonly "
 867                        "files from %s\n", path_w_slash));
 868                 SMB_VFS_NEXT_REWINDDIR(handle, dirp);
 869                 while ((dire = SMB_VFS_NEXT_READDIR(handle, dirp, NULL))
 870                        != NULL) {
 871                         char *fullpath;
 872                         struct smb_filename *smb_fname = NULL;
 873                         if (ISDOT(dire->d_name) || ISDOTDOT(dire->d_name)) {
 874                                 continue;
 875                         }
 876                         fullpath = path_plus_name(ctx,path_w_slash,
 877                                                   dire->d_name);
 878                         create_synthetic_smb_fname(ctx, fullpath,NULL,NULL,
 879                                                    &smb_fname);
 880                         DEBUG(SCANNEDONLY_DEBUG, ("unlink %s\n", fullpath));
 881                         SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 882                         TALLOC_FREE(fullpath);
 883                         TALLOC_FREE(smb_fname);
 884                 }
 885         }
 886         return SMB_VFS_NEXT_CLOSEDIR(handle, dirp);
 887 }
 888
 889 static void free_scannedonly_data(void **data)
 890 {
 891         SAFE_FREE(*data);
 892 }
 893
 894 static int scannedonly_connect(struct vfs_handle_struct *handle,
 895                                const char *service, const char *user)
 896 {
 897
 898         struct Tscannedonly *so;
 899
 900         so = SMB_MALLOC_P(struct Tscannedonly);
 901         handle->data = (void *)so;
 902         handle->free_data = free_scannedonly_data;
 903         so->gsendbuffer[0]='\0';
 904         so->domain_socket =
 905                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 906                              "domain_socket", True);
 907         so->socketname =
 908                 (char *)lp_parm_const_string(SNUM(handle->conn),
 909                                              "scannedonly", "socketname",
 910                                              "/var/lib/scannedonly/scan");
 911         so->portnum =
 912                 lp_parm_int(SNUM(handle->conn), "scannedonly", "portnum",
 913                             2020);
 914         so->scanhost =
 915                 (char *)lp_parm_const_string(SNUM(handle->conn),
 916                                              "scannedonly", "scanhost",
 917                                              "localhost");
 918
 919         so->show_special_files =
 920                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 921                              "show_special_files", True);
 922         so->rm_hidden_files_on_rmdir =
 923                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 924                              "rm_hidden_files_on_rmdir", True);
 925         so->hide_nonscanned_files =
 926                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 927                              "hide_nonscanned_files", False);
 928         so->allow_nonscanned_files =
 929                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 930                              "allow_nonscanned_files", False);
 931         so->scanning_message =
 932                 (char *)lp_parm_const_string(SNUM(handle->conn),
 933                                              "scannedonly",
 934                                              "scanning_message",
 935                                              "is being scanned for viruses");
 936         so->scanning_message_len = strlen(so->scanning_message);
 937         so->recheck_time_open =
 938                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 939                             "recheck_time_open", 50);
 940         so->recheck_tries_open =
 941                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 942                             "recheck_tries_open", 100);
 943         so->recheck_size_open =
 944                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 945                             "recheck_size_open", 100);
 946         so->recheck_time_readdir =
 947                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 948                             "recheck_time_readdir", 50);
 949         so->recheck_tries_readdir =
 950                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 951                             "recheck_tries_readdir", 20);
 952
 953         so->p_scanned =
 954                 (char *)lp_parm_const_string(SNUM(handle->conn),
 955                                              "scannedonly",
 956                                              "pref_scanned",
 957                                              ".scanned:");
 958         so->p_virus =
 959                 (char *)lp_parm_const_string(SNUM(handle->conn),
 960                                              "scannedonly",
 961                                              "pref_virus",
 962                                              ".virus:");
 963         so->p_failed =
 964                 (char *)lp_parm_const_string(SNUM(handle->conn),
 965                                              "scannedonly",
 966                                              "pref_failed",
 967                                              ".failed:");
 968         connect_to_scanner(handle);
 969
 970         return SMB_VFS_NEXT_CONNECT(handle, service, user);
 971 }
 972
 973 /* VFS operations structure */
 974 static struct vfs_fn_pointers vfs_scannedonly_fns = {
 975         .opendir = scannedonly_opendir,
 976         .readdir = scannedonly_readdir,
 977         .seekdir = scannedonly_seekdir,
 978         .telldir = scannedonly_telldir,
 979         .rewind_dir = scannedonly_rewinddir,
 980         .closedir = scannedonly_closedir,
 981         .rmdir = scannedonly_rmdir,
 982         .stat = scannedonly_stat,
 983         .lstat = scannedonly_lstat,
 984         .open = scannedonly_open,
 985         .close_fn = scannedonly_close,
 986         .rename = scannedonly_rename,
 987         .unlink = scannedonly_unlink,
 988         .connect_fn = scannedonly_connect
 989 };
 990
 991 NTSTATUS vfs_scannedonly_init(void)
 992 {
 993         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "scannedonly",
 994                                 &vfs_scannedonly_fns);
 995 }