source3/modules/vfs_scannedonly.c

   1 /*
   2  * scannedonly VFS module for Samba 3.5 and beyond
   3  *
   4  * Copyright 2007,2008,2009,2010,2011 (C) Olivier Sessink
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  * ABOUT SCANNEDONLY
  21  *
  22  * scannedonly implements a 'filter' like vfs module that talks over a
  23  * unix domain socket or over UDP to a anti-virus engine.
  24  *
  25  * files that are clean have a corresponding .scanned:{filename} file
  26  * in the same directory. So why the .scanned: files? They take up
  27  * only an inode, because they are 0 bytes. To test if the file is
  28  * scanned only a stat() call on the filesystem is needed which is
  29  * very quick compared to a database lookup. All modern filesystems
  30  * use database technology such as balanced trees for lookups anyway.
  31  * The number of inodes in modern filesystems is also not limiting
  32  * anymore. The .scanned: files are also easy scriptable. You can
  33  * remove them with a simple find command or create them with a
  34  * simple touch command. Extended filesystem attributes have similar
  35  * properties, but are not supported on all filesystems, so that
  36  * would limit the usage of the module (and attributes are not as
  37  * easily scriptable)
  38  *
  39  * files that are not clean are sent to the AV-engine. Only the
  40  * filename is sent over the socket. The protocol is very simple:
  41  * a newline separated list of filenames inside each datagram.
  42  *
  43  * a file AV-scan may be requested multiple times, the AV-engine
  44  * should also check if the file has been scanned already. Requests
  45  * can also be dropped by the AV-engine (and we thus don't need the
  46  * reliability of TCP).
  47  *
  48  */
  49
  50 #include "includes.h"
  51 #include "smbd/smbd.h"
  52 #include "system/filesys.h"
  53
  54 #include "config.h"
  55
  56 #define SENDBUFFERSIZE 1450
  57
  58 #ifndef       SUN_LEN
  59 #define       SUN_LEN(sunp)   ((size_t)((struct sockaddr_un *)0)->sun_path \
  60                                 + strlen((sunp)->sun_path))
  61 #endif
  62
  63
  64 struct Tscannedonly {
  65         int socket;
  66         int domain_socket;
  67         int portnum;
  68         int scanning_message_len;
  69         int recheck_time_open;
  70         int recheck_tries_open;
  71         int recheck_size_open;
  72         int recheck_time_readdir;
  73         int recheck_tries_readdir;
  74         bool show_special_files;
  75         bool rm_hidden_files_on_rmdir;
  76         bool hide_nonscanned_files;
  77         bool allow_nonscanned_files;
  78         const char *socketname;
  79         const char *scanhost;
  80         const char *scanning_message;
  81         const char *p_scanned; /* prefix for scanned files */
  82         const char *p_virus; /* prefix for virus containing files */
  83         const char *p_failed; /* prefix for failed to scan files */
  84         char gsendbuffer[SENDBUFFERSIZE + 1];
  85 };
  86
  87 #define STRUCTSCANO(var) ((struct Tscannedonly *)var)
  88
  89 struct scannedonly_DIR {
  90         char *base;
  91         int recheck_tries_done; /* if 0 the directory listing has not yet
  92         been checked for files that need to be scanned. */
  93         DIR *DIR;
  94 };
  95 #define SCANNEDONLY_DEBUG 9
  96 /*********************/
  97 /* utility functions */
  98 /*********************/
  99
 100 static char *real_path_from_notify_path(TALLOC_CTX *ctx,
 101                                         struct Tscannedonly *so,
 102                                         const char *path)
 103 {
 104         char *name;
 105         int len, pathlen;
 106
 107         name = strrchr(path, '/');
 108         if (!name) {
 109                 return NULL;
 110         }
 111         pathlen = name - path;
 112         name++;
 113         len = strlen(name);
 114         if (len <= so->scanning_message_len) {
 115                 return NULL;
 116         }
 117
 118         if (strcmp(name + (len - so->scanning_message_len),
 119                    so->scanning_message) != 0) {
 120                 return NULL;
 121         }
 122
 123         return talloc_strndup(ctx,path,
 124                               pathlen + len - so->scanning_message_len);
 125 }
 126
 127 static char *cachefile_name(TALLOC_CTX *ctx,
 128                             const char *shortname,
 129                             const char *base,
 130                             const char *p_scanned)
 131 {
 132         return talloc_asprintf(ctx, "%s%s%s", base, p_scanned, shortname);
 133 }
 134
 135 static char *name_w_ending_slash(TALLOC_CTX *ctx, const char *name)
 136 {
 137         int len = strlen(name);
 138         if (name[len - 1] == '/') {
 139                 return talloc_strdup(ctx,name);
 140         } else {
 141                 return talloc_asprintf(ctx, "%s/", name);
 142         }
 143 }
 144
 145 static char *cachefile_name_f_fullpath(TALLOC_CTX *ctx,
 146                                        const char *fullpath,
 147                                        const char *p_scanned)
 148 {
 149         const char *base;
 150         char *tmp, *cachefile;
 151         const char *shortname;
 152         tmp = strrchr(fullpath, '/');
 153         if (tmp) {
 154                 base = talloc_strndup(ctx, fullpath, (tmp - fullpath) + 1);
 155                 shortname = tmp + 1;
 156         } else {
 157                 base = "";
 158                 shortname = (const char *)fullpath;
 159         }
 160         cachefile = cachefile_name(ctx, shortname, base, p_scanned);
 161         DEBUG(SCANNEDONLY_DEBUG,
 162               ("cachefile_name_f_fullpath cachefile=%s\n", cachefile));
 163         return cachefile;
 164 }
 165
 166 static char *construct_full_path(TALLOC_CTX *ctx, vfs_handle_struct * handle,
 167                                  const char *somepath, bool ending_slash)
 168 {
 169         const char *tmp;
 170
 171         if (!somepath) {
 172                 return NULL;
 173         }
 174         if (somepath[0] == '/') {
 175                 if (ending_slash) {
 176                         return name_w_ending_slash(ctx,somepath);
 177                 }
 178                 return talloc_strdup(ctx,somepath);
 179         }
 180         tmp = somepath;
 181         if (tmp[0]=='.'&&tmp[1]=='/') {
 182                 tmp+=2;
 183         }
 184         /* vfs_GetWd() seems to return a path with a slash */
 185         if (ending_slash) {
 186                 return talloc_asprintf(ctx, "%s/%s/",
 187                                        vfs_GetWd(ctx, handle->conn),tmp);
 188         }
 189         return talloc_asprintf(ctx, "%s/%s",
 190                                vfs_GetWd(ctx, handle->conn),tmp);
 191 }
 192
 193 static int connect_to_scanner(vfs_handle_struct * handle)
 194 {
 195         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
 196
 197         if (so->domain_socket) {
 198                 struct sockaddr_un saun;
 199                 DEBUG(SCANNEDONLY_DEBUG, ("socket=%s\n", so->socketname));
 200                 if ((so->socket = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
 201                         DEBUG(2, ("failed to create socket %s\n",
 202                                   so->socketname));
 203                         return -1;
 204                 }
 205                 saun.sun_family = AF_UNIX;
 206                 strncpy(saun.sun_path, so->socketname,
 207                         sizeof(saun.sun_path) - 1);
 208                 if (connect(so->socket, (struct sockaddr *)(void *)&saun,
 209                             SUN_LEN(&saun)) < 0) {
 210                         DEBUG(2, ("failed to connect to socket %s\n",
 211                                   so->socketname));
 212                         return -1;
 213                 }
 214                 DEBUG(SCANNEDONLY_DEBUG,("bound %s to socket %d\n",
 215                                          saun.sun_path, so->socket));
 216
 217         } else {
 218                 so->socket = open_udp_socket(so->scanhost, so->portnum);
 219                 if (so->socket < 0) {
 220                         DEBUG(2,("failed to open UDP socket to %s:%d\n",
 221                                  so->scanhost,so->portnum));
 222                         return -1;
 223                 }
 224         }
 225
 226         {/* increasing the socket buffer is done because we have large bursts
 227             of UDP packets or DGRAM's on a domain socket whenever we hit a
 228             large directory with lots of unscanned files. */
 229                 int sndsize;
 230                 socklen_t size = sizeof(int);
 231                 if (getsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
 232                                (char *)&sndsize, &size) == 0) {
 233                         DEBUG(SCANNEDONLY_DEBUG,
 234                               ("current socket buffer size=%d\n",
 235                                sndsize));
 236                 }
 237                 sndsize = 262144;
 238                 if (setsockopt(so->socket, SOL_SOCKET, SO_RCVBUF,
 239                                (char *)&sndsize,
 240                                (int)sizeof(sndsize)) != 0) {
 241                         DEBUG(SCANNEDONLY_DEBUG,
 242                               ("error setting socket buffer %s (%d)\n",
 243                                strerror(errno), errno));
 244                 }
 245         }
 246         set_blocking(so->socket, false);
 247         return 0;
 248 }
 249
 250 static void flush_sendbuffer(vfs_handle_struct * handle)
 251 {
 252         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
 253         int ret, len, loop = 10;
 254         if (so->gsendbuffer[0] == '\0') {
 255                 return;
 256         }
 257
 258         do {
 259                 loop--;
 260                 len = strlen(so->gsendbuffer);
 261                 ret = send(so->socket, so->gsendbuffer, len, 0);
 262                 if (ret == len) {
 263                         so->gsendbuffer[0] = '\0';
 264                         break;
 265                 }
 266                 if (ret == -1) {
 267                         DEBUG(3,("scannedonly flush_sendbuffer: "
 268                                  "error sending on socket %d to scanner:"
 269                                  " %s (%d)\n",
 270                                  so->socket, strerror(errno), errno));
 271                         if (errno == ECONNREFUSED || errno == ENOTCONN
 272                             || errno == ECONNRESET) {
 273                                 if (connect_to_scanner(handle) == -1)
 274                                         break;  /* connecting fails, abort */
 275                                 /* try again */
 276                         } else if (errno != EINTR) {
 277                                 /* on EINTR we just try again, all remaining
 278                                    other errors we log the error
 279                                    and try again ONCE */
 280                                 loop = 1;
 281                                 DEBUG(3,("scannedonly flush_sendbuffer: "
 282                                          "error sending data to scanner: %s "
 283                                          "(%d)\n", strerror(errno), errno));
 284                         }
 285                 } else {
 286                         /* --> partial write: Resend all filenames that were
 287                            not or not completely written. a partial filename
 288                            written means the filename will not arrive correctly,
 289                            so resend it completely */
 290                         int pos = 0;
 291                         while (pos < len) {
 292                                 char *tmp = strchr(so->gsendbuffer+pos, '\n');
 293                                 if (tmp && tmp - so->gsendbuffer < ret)
 294                                         pos = tmp - so->gsendbuffer + 1;
 295                                 else
 296                                         break;
 297                         }
 298                         memmove(so->gsendbuffer, so->gsendbuffer + pos,
 299                                 SENDBUFFERSIZE - ret);
 300                         /* now try again */
 301                 }
 302         } while (loop > 0);
 303
 304         if (so->gsendbuffer[0] != '\0') {
 305                 DEBUG(2,
 306                       ("scannedonly flush_sendbuffer: "
 307                        "failed to send files to AV scanner, "
 308                        "discarding files."));
 309                 so->gsendbuffer[0] = '\0';
 310         }
 311 }
 312
 313 static void notify_scanner(vfs_handle_struct * handle, const char *scanfile)
 314 {
 315         const char *tmp;
 316         int tmplen, gsendlen;
 317         struct Tscannedonly *so = (struct Tscannedonly *)handle->data;
 318         TALLOC_CTX *ctx=talloc_tos();
 319         if (scanfile[0] != '/') {
 320                 tmp = construct_full_path(ctx,handle, scanfile, false);
 321         } else {
 322                 tmp = (const char *)scanfile;
 323         }
 324         tmplen = strlen(tmp);
 325         gsendlen = strlen(so->gsendbuffer);
 326         DEBUG(SCANNEDONLY_DEBUG,
 327               ("scannedonly notify_scanner: tmp=%s, tmplen=%d, gsendlen=%d\n",
 328                tmp, tmplen, gsendlen));
 329         if (gsendlen + tmplen >= SENDBUFFERSIZE) {
 330                 flush_sendbuffer(handle);
 331         }
 332         /* FIXME ! Truncate checks... JRA. */
 333         (void)strlcat(so->gsendbuffer, tmp, SENDBUFFERSIZE + 1);
 334         (void)strlcat(so->gsendbuffer, "\n", SENDBUFFERSIZE + 1);
 335 }
 336
 337 static bool is_scannedonly_file(struct Tscannedonly *so, const char *shortname)
 338 {
 339         if (shortname[0]!='.') {
 340                 return false;
 341         }
 342         if (strncmp(shortname, so->p_scanned, strlen(so->p_scanned)) == 0) {
 343                 return true;
 344         }
 345         if (strncmp(shortname, so->p_virus, strlen(so->p_virus)) == 0) {
 346                 return true;
 347         }
 348         if (strncmp(shortname, so->p_failed, strlen(so->p_failed)) == 0) {
 349                 return true;
 350         }
 351         return false;
 352 }
 353
 354 static bool timespec_is_newer(struct timespec *base, struct timespec *test)
 355 {
 356         return timespec_compare(base,test) < 0;
 357 }
 358
 359 /*
 360 vfs_handle_struct *handle the scannedonly handle
 361 scannedonly_DIR * sDIR the scannedonly struct if called from _readdir()
 362 or NULL
 363 fullpath is a full path starting from / or a relative path to the
 364 current working directory
 365 shortname is the filename without directory components
 366 basename, is the directory without file name component
 367 allow_nonexistent return TRUE if stat() on the requested file fails
 368 recheck_time, the time in milliseconds to wait for the daemon to
 369 create a .scanned file
 370 recheck_tries, the number of tries to wait
 371 recheck_size, size in Kb of files that should not be waited for
 372 loop : boolean if we should try to loop over all files in the directory
 373 and send a notify to the scanner for all files that need scanning
 374 */
 375 static bool scannedonly_allow_access(vfs_handle_struct * handle,
 376                                      struct scannedonly_DIR *sDIR,
 377                                      struct smb_filename *smb_fname,
 378                                      const char *shortname,
 379                                      const char *base_name,
 380                                      int allow_nonexistent,
 381                                      int recheck_time, int recheck_tries,
 382                                      int recheck_size, int loop)
 383 {
 384         struct smb_filename *cache_smb_fname;
 385         TALLOC_CTX *ctx=talloc_tos();
 386         char *cachefile;
 387         int retval = -1;
 388         DEBUG(SCANNEDONLY_DEBUG,
 389               ("smb_fname->base_name=%s, shortname=%s, base_name=%s\n"
 390                ,smb_fname->base_name,shortname,base_name));
 391
 392         if (ISDOT(shortname) || ISDOTDOT(shortname)) {
 393                 return true;
 394         }
 395         if (is_scannedonly_file(STRUCTSCANO(handle->data), shortname)) {
 396                 DEBUG(SCANNEDONLY_DEBUG,
 397                       ("scannedonly_allow_access, %s is a scannedonly file, "
 398                        "return 0\n", shortname));
 399                 return false;
 400         }
 401
 402         if (!VALID_STAT(smb_fname->st)) {
 403                 DEBUG(SCANNEDONLY_DEBUG,("stat %s\n",smb_fname->base_name));
 404                 retval = SMB_VFS_NEXT_STAT(handle, smb_fname);
 405                 if (retval != 0) {
 406                         /* failed to stat this file?!? --> hide it */
 407                         DEBUG(SCANNEDONLY_DEBUG,("no valid stat, return"
 408                                                  " allow_nonexistent=%d\n",
 409                                                  allow_nonexistent));
 410                         return allow_nonexistent;
 411                 }
 412         }
 413         if (!S_ISREG(smb_fname->st.st_ex_mode)) {
 414                 DEBUG(SCANNEDONLY_DEBUG,
 415                       ("%s is not a regular file, ISDIR=%d\n",
 416                        smb_fname->base_name,
 417                        S_ISDIR(smb_fname->st.st_ex_mode)));
 418                 return (STRUCTSCANO(handle->data)->
 419                         show_special_files ||
 420                         S_ISDIR(smb_fname->st.st_ex_mode));
 421         }
 422         if (smb_fname->st.st_ex_size == 0) {
 423                 DEBUG(SCANNEDONLY_DEBUG,("empty file, return 1\n"));
 424                 return true;    /* empty files cannot contain viruses ! */
 425         }
 426         cachefile = cachefile_name(ctx,
 427                                    shortname,
 428                                    base_name,
 429                                    STRUCTSCANO(handle->data)->p_scanned);
 430         cache_smb_fname = synthetic_smb_fname(ctx, cachefile,NULL,NULL);
 431         if (!VALID_STAT(cache_smb_fname->st)) {
 432                 retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
 433         }
 434         if (retval == 0 && VALID_STAT(cache_smb_fname->st)) {
 435                 if (timespec_is_newer(&smb_fname->st.st_ex_ctime,
 436                                       &cache_smb_fname->st.st_ex_ctime)) {
 437                         talloc_free(cache_smb_fname);
 438                         return true;
 439                 }
 440                 /* no cachefile or too old */
 441                 SMB_VFS_NEXT_UNLINK(handle, cache_smb_fname);
 442                 retval = -1;
 443         }
 444
 445         notify_scanner(handle, smb_fname->base_name);
 446
 447         if (loop && sDIR && sDIR->recheck_tries_done == 0) {
 448                 /* check the rest of the directory and notify the
 449                    scanner if some file needs scanning */
 450                 long offset;
 451                 struct dirent *dire;
 452
 453                 offset = SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
 454                 dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, NULL);
 455                 while (dire) {
 456                         char *fpath2;
 457                         struct smb_filename *smb_fname2;
 458                         fpath2 = talloc_asprintf(ctx, "%s%s", base_name,dire->d_name);
 459                         DEBUG(SCANNEDONLY_DEBUG,
 460                               ("scannedonly_allow_access in loop, "
 461                                "found %s\n", fpath2));
 462                         smb_fname2 = synthetic_smb_fname(
 463                                 ctx, fpath2,NULL,NULL);
 464                         scannedonly_allow_access(handle, NULL,
 465                                                  smb_fname2,
 466                                                  dire->d_name,
 467                                                  base_name, 0, 0, 0, 0, 0);
 468                         talloc_free(fpath2);
 469                         talloc_free(smb_fname2);
 470                         dire = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR,NULL);
 471                 }
 472                 sDIR->recheck_tries_done = 1;
 473                 SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
 474         }
 475         if (recheck_time > 0
 476             && ((recheck_size > 0
 477                  && smb_fname->st.st_ex_size < (1024 * recheck_size))
 478                  || (sDIR && sDIR->recheck_tries_done < recheck_tries)
 479                 )) {
 480                 int numloops = sDIR ? sDIR->recheck_tries_done : 0;
 481                 flush_sendbuffer(handle);
 482                 while (retval != 0      /*&& errno == ENOENT */
 483                        && numloops < recheck_tries) {
 484                         DEBUG(SCANNEDONLY_DEBUG,
 485                               ("scannedonly_allow_access, wait (try=%d "
 486                                "(max %d), %d ms) for %s\n",
 487                                numloops, recheck_tries,
 488                                recheck_time, cache_smb_fname->base_name));
 489                         smb_msleep(recheck_time);
 490                         retval = SMB_VFS_NEXT_STAT(handle, cache_smb_fname);
 491                         numloops++;
 492                 }
 493                 if (sDIR)
 494                         sDIR->recheck_tries_done = numloops;
 495         }
 496         /* still no cachefile, or still too old, return 0 */
 497         if (retval != 0
 498             || !timespec_is_newer(&smb_fname->st.st_ex_ctime,
 499                                   &cache_smb_fname->st.st_ex_ctime)) {
 500                 DEBUG(SCANNEDONLY_DEBUG,
 501                       ("retval=%d, return 0\n",retval));
 502                 return false;
 503         }
 504         return true;
 505 }
 506
 507 /*********************/
 508 /* VFS functions     */
 509 /*********************/
 510
 511 static DIR *scannedonly_opendir(vfs_handle_struct * handle,
 512                                            const char *fname,
 513                                            const char *mask, uint32_t attr)
 514 {
 515         DIR *DIRp;
 516         struct scannedonly_DIR *sDIR;
 517
 518         DIRp = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 519         if (!DIRp) {
 520                 return NULL;
 521         }
 522
 523         sDIR = talloc(NULL, struct scannedonly_DIR);
 524         if (fname[0] != '/') {
 525                 sDIR->base = construct_full_path(sDIR,handle, fname, true);
 526         } else {
 527                 sDIR->base = name_w_ending_slash(sDIR, fname);
 528         }
 529         DEBUG(SCANNEDONLY_DEBUG,
 530                         ("scannedonly_opendir, fname=%s, base=%s\n",fname,sDIR->base));
 531         sDIR->DIR = DIRp;
 532         sDIR->recheck_tries_done = 0;
 533         return (DIR *) sDIR;
 534 }
 535
 536 static DIR *scannedonly_fdopendir(vfs_handle_struct * handle,
 537                                            files_struct *fsp,
 538                                            const char *mask, uint32_t attr)
 539 {
 540         DIR *DIRp;
 541         struct scannedonly_DIR *sDIR;
 542         const char *fname;
 543
 544         DIRp = SMB_VFS_NEXT_FDOPENDIR(handle, fsp, mask, attr);
 545         if (!DIRp) {
 546                 return NULL;
 547         }
 548
 549         fname = (const char *)fsp->fsp_name->base_name;
 550
 551         sDIR = talloc(NULL, struct scannedonly_DIR);
 552         if (fname[0] != '/') {
 553                 sDIR->base = construct_full_path(sDIR,handle, fname, true);
 554         } else {
 555                 sDIR->base = name_w_ending_slash(sDIR, fname);
 556         }
 557         DEBUG(SCANNEDONLY_DEBUG,
 558                         ("scannedonly_fdopendir, fname=%s, base=%s\n",fname,sDIR->base));
 559         sDIR->DIR = DIRp;
 560         sDIR->recheck_tries_done = 0;
 561         return (DIR *) sDIR;
 562 }
 563
 564
 565 static struct dirent *scannedonly_readdir(vfs_handle_struct *handle,
 566                                               DIR * dirp,
 567                                               SMB_STRUCT_STAT *sbuf)
 568 {
 569         struct dirent *result;
 570         int allowed = 0;
 571         char *tmp;
 572         struct smb_filename *smb_fname;
 573         char *notify_name;
 574         int namelen;
 575         struct dirent *newdirent;
 576         TALLOC_CTX *ctx=talloc_tos();
 577
 578         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 579         if (!dirp) {
 580                 return NULL;
 581         }
 582
 583         result = SMB_VFS_NEXT_READDIR(handle, sDIR->DIR, sbuf);
 584
 585         if (!result)
 586                 return NULL;
 587
 588         if (is_scannedonly_file(STRUCTSCANO(handle->data), result->d_name)) {
 589                 DEBUG(SCANNEDONLY_DEBUG,
 590                       ("scannedonly_readdir, %s is a scannedonly file, "
 591                        "skip to next entry\n", result->d_name));
 592                 return scannedonly_readdir(handle, dirp, NULL);
 593         }
 594         tmp = talloc_asprintf(ctx, "%s%s", sDIR->base, result->d_name);
 595         DEBUG(SCANNEDONLY_DEBUG,
 596               ("scannedonly_readdir, check access to %s (sbuf=%p)\n",
 597                tmp,sbuf));
 598
 599         /* even if we don't hide nonscanned files or we allow non scanned
 600            files we call allow_access because it will notify the daemon to
 601            scan these files */
 602         smb_fname = synthetic_smb_fname(ctx, tmp,NULL,
 603                                         sbuf?VALID_STAT(*sbuf)?sbuf:NULL:NULL);
 604         allowed = scannedonly_allow_access(
 605                 handle, sDIR, smb_fname,
 606                 result->d_name,
 607                 sDIR->base, 0,
 608                 STRUCTSCANO(handle->data)->hide_nonscanned_files
 609                 ? STRUCTSCANO(handle->data)->recheck_time_readdir
 610                 : 0,
 611                 STRUCTSCANO(handle->data)->recheck_tries_readdir,
 612                 -1,
 613                 1);
 614         DEBUG(SCANNEDONLY_DEBUG,
 615               ("scannedonly_readdir access to %s (%s) = %d\n", tmp,
 616                result->d_name, allowed));
 617         if (allowed) {
 618                 return result;
 619         }
 620         DEBUG(SCANNEDONLY_DEBUG,
 621               ("hide_nonscanned_files=%d, allow_nonscanned_files=%d\n",
 622                STRUCTSCANO(handle->data)->hide_nonscanned_files,
 623                STRUCTSCANO(handle->data)->allow_nonscanned_files
 624                       ));
 625
 626         if (!STRUCTSCANO(handle->data)->hide_nonscanned_files
 627             || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
 628                 return result;
 629         }
 630
 631         DEBUG(SCANNEDONLY_DEBUG,
 632               ("scannedonly_readdir, readdir listing for %s not "
 633                "allowed, notify user\n", result->d_name));
 634         notify_name = talloc_asprintf(
 635                 ctx,"%s %s",result->d_name,
 636                 STRUCTSCANO(handle->data)->scanning_message);
 637         namelen = strlen(notify_name);
 638         newdirent = (struct dirent *)talloc_array(
 639                 ctx, char, sizeof(struct dirent) + namelen + 1);
 640         if (!newdirent) {
 641                 return NULL;
 642         }
 643         memcpy(newdirent, result, sizeof(struct dirent));
 644         memcpy(&newdirent->d_name, notify_name, namelen + 1);
 645         DEBUG(SCANNEDONLY_DEBUG,
 646               ("scannedonly_readdir, return newdirent at %p with "
 647                "notification %s\n", newdirent, newdirent->d_name));
 648         return newdirent;
 649 }
 650
 651 static void scannedonly_seekdir(struct vfs_handle_struct *handle,
 652                                 DIR * dirp, long offset)
 653 {
 654         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 655         SMB_VFS_NEXT_SEEKDIR(handle, sDIR->DIR, offset);
 656 }
 657
 658 static long scannedonly_telldir(struct vfs_handle_struct *handle,
 659                                 DIR * dirp)
 660 {
 661         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 662         return SMB_VFS_NEXT_TELLDIR(handle, sDIR->DIR);
 663 }
 664
 665 static void scannedonly_rewinddir(struct vfs_handle_struct *handle,
 666                                   DIR * dirp)
 667 {
 668         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 669         SMB_VFS_NEXT_REWINDDIR(handle, sDIR->DIR);
 670 }
 671
 672 static int scannedonly_closedir(vfs_handle_struct * handle,
 673                                 DIR * dirp)
 674 {
 675         int retval;
 676         struct scannedonly_DIR *sDIR = (struct scannedonly_DIR *)dirp;
 677         flush_sendbuffer(handle);
 678         retval = SMB_VFS_NEXT_CLOSEDIR(handle, sDIR->DIR);
 679         TALLOC_FREE(sDIR);
 680         return retval;
 681 }
 682
 683 static int scannedonly_stat(vfs_handle_struct * handle,
 684                             struct smb_filename *smb_fname)
 685 {
 686         int ret;
 687         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
 688         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_stat: %s returned %d\n",
 689                                   smb_fname->base_name, ret));
 690         if (ret != 0 && errno == ENOENT) {
 691                 TALLOC_CTX *ctx=talloc_tos();
 692                 char *test_base_name, *tmp_base_name = smb_fname->base_name;
 693                 /* possibly this was a fake name (file is being scanned for
 694                    viruses.txt): check for that and create the real name and
 695                    stat the real name */
 696                 test_base_name = real_path_from_notify_path(
 697                         ctx,
 698                         STRUCTSCANO(handle->data),
 699                         smb_fname->base_name);
 700                 if (test_base_name) {
 701                         smb_fname->base_name = test_base_name;
 702                         ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
 703                         DEBUG(5, ("_stat: %s returned %d\n",
 704                                   test_base_name, ret));
 705                         smb_fname->base_name = tmp_base_name;
 706                 }
 707         }
 708         return ret;
 709 }
 710
 711 static int scannedonly_lstat(vfs_handle_struct * handle,
 712                              struct smb_filename *smb_fname)
 713 {
 714         int ret;
 715         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 716         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_lstat: %s returned %d\n",
 717                                   smb_fname->base_name, ret));
 718         if (ret != 0 && errno == ENOENT) {
 719                 TALLOC_CTX *ctx=talloc_tos();
 720                 char *test_base_name, *tmp_base_name = smb_fname->base_name;
 721                 /* possibly this was a fake name (file is being scanned for
 722                    viruses.txt): check for that and create the real name and
 723                    stat the real name */
 724                 test_base_name = real_path_from_notify_path(
 725                         ctx, STRUCTSCANO(handle->data), smb_fname->base_name);
 726                 if (test_base_name) {
 727                         smb_fname->base_name = test_base_name;
 728                         ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 729                         DEBUG(5, ("_lstat: %s returned %d\n",
 730                                   test_base_name, ret));
 731                         smb_fname->base_name = tmp_base_name;
 732                 }
 733         }
 734         return ret;
 735 }
 736
 737 static int scannedonly_open(vfs_handle_struct * handle,
 738                             struct smb_filename *smb_fname,
 739                             files_struct * fsp, int flags, mode_t mode)
 740 {
 741         const char *base;
 742         char *tmp, *shortname;
 743         int allowed, write_access = 0;
 744         TALLOC_CTX *ctx=talloc_tos();
 745         /* if open for writing ignore it */
 746         if ((flags & O_ACCMODE) == O_WRONLY) {
 747                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 748         }
 749         if ((flags & O_ACCMODE) == O_RDWR) {
 750                 write_access = 1;
 751         }
 752         /* check if this file is scanned already */
 753         tmp = strrchr(smb_fname->base_name, '/');
 754         if (tmp) {
 755                 base = talloc_strndup(ctx,smb_fname->base_name,
 756                                       (tmp - smb_fname->base_name) + 1);
 757                 shortname = tmp + 1;
 758         } else {
 759                 base = "";
 760                 shortname = (char *)smb_fname->base_name;
 761         }
 762         allowed = scannedonly_allow_access(
 763                 handle, NULL, smb_fname, shortname,
 764                 base,
 765                 write_access,
 766                 STRUCTSCANO(handle->data)->recheck_time_open,
 767                 STRUCTSCANO(handle->data)->recheck_tries_open,
 768                 STRUCTSCANO(handle->data)->recheck_size_open,
 769                 0);
 770         flush_sendbuffer(handle);
 771         DEBUG(SCANNEDONLY_DEBUG, ("scannedonly_open: allow=%d for %s\n",
 772                                   allowed, smb_fname->base_name));
 773         if (allowed
 774             || STRUCTSCANO(handle->data)->allow_nonscanned_files) {
 775                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 776         }
 777         errno = EACCES;
 778         return -1;
 779 }
 780
 781 static int scannedonly_close(vfs_handle_struct * handle, files_struct * fsp)
 782 {
 783         /* we only have to notify the scanner
 784            for files that were open readwrite or writable. */
 785         if (fsp->can_write) {
 786                 TALLOC_CTX *ctx = talloc_tos();
 787                 notify_scanner(handle, construct_full_path(
 788                                        ctx,handle,
 789                                        fsp->fsp_name->base_name,false));
 790                 flush_sendbuffer(handle);
 791         }
 792         return SMB_VFS_NEXT_CLOSE(handle, fsp);
 793 }
 794
 795 static int scannedonly_rename(vfs_handle_struct * handle,
 796                               const struct smb_filename *smb_fname_src,
 797                               const struct smb_filename *smb_fname_dst)
 798 {
 799         /* rename the cache file before we pass the actual rename on */
 800         struct smb_filename *smb_fname_src_tmp = NULL;
 801         struct smb_filename *smb_fname_dst_tmp = NULL;
 802         char *cachefile_src, *cachefile_dst;
 803         bool needscandst=false;
 804         int ret;
 805         TALLOC_CTX *ctx = talloc_tos();
 806
 807         /* Setup temporary smb_filename structs. */
 808         cachefile_src = cachefile_name_f_fullpath(
 809                 ctx,
 810                 smb_fname_src->base_name,
 811                 STRUCTSCANO(handle->data)->p_scanned);
 812         cachefile_dst = cachefile_name_f_fullpath(
 813                 ctx,
 814                 smb_fname_dst->base_name,
 815                 STRUCTSCANO(handle->data)->p_scanned);
 816         smb_fname_src_tmp = synthetic_smb_fname(ctx, cachefile_src,NULL,NULL);
 817         smb_fname_dst_tmp = synthetic_smb_fname(ctx, cachefile_dst,NULL,NULL);
 818
 819         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src_tmp, smb_fname_dst_tmp);
 820         if (ret == ENOENT) {
 821                 needscandst=true;
 822         } else if (ret != 0) {
 823                 DEBUG(SCANNEDONLY_DEBUG,
 824                       ("failed to rename %s into %s error %d: %s\n", cachefile_src,
 825                        cachefile_dst, ret, strerror(ret)));
 826                 needscandst=true;
 827         }
 828         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
 829         if (ret == 0 && needscandst) {
 830                 notify_scanner(handle, smb_fname_dst->base_name);
 831                 flush_sendbuffer(handle);
 832         }
 833         return ret;
 834 }
 835
 836 static int scannedonly_unlink(vfs_handle_struct * handle,
 837                               const struct smb_filename *smb_fname)
 838 {
 839         /* unlink the 'scanned' file too */
 840         struct smb_filename *smb_fname_cache = NULL;
 841         char * cachefile;
 842         TALLOC_CTX *ctx = talloc_tos();
 843
 844         cachefile = cachefile_name_f_fullpath(
 845                 ctx,
 846                 smb_fname->base_name,
 847                 STRUCTSCANO(handle->data)->p_scanned);
 848         smb_fname_cache = synthetic_smb_fname(ctx, cachefile,NULL,NULL);
 849         if (SMB_VFS_NEXT_UNLINK(handle, smb_fname_cache) != 0) {
 850                 DEBUG(SCANNEDONLY_DEBUG, ("_unlink: failed to unlink %s\n",
 851                                           smb_fname_cache->base_name));
 852         }
 853         return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 854 }
 855
 856 static int scannedonly_rmdir(vfs_handle_struct * handle, const char *path)
 857 {
 858         /* if there are only .scanned: .virus: or .failed: files, we delete
 859            those, because the client cannot see them */
 860         DIR *dirp;
 861         struct dirent *dire;
 862         TALLOC_CTX *ctx = talloc_tos();
 863         bool only_deletable_files = true, have_files = false;
 864         char *path_w_slash;
 865
 866         if (!STRUCTSCANO(handle->data)->rm_hidden_files_on_rmdir)
 867                 return SMB_VFS_NEXT_RMDIR(handle, path);
 868
 869         path_w_slash = name_w_ending_slash(ctx,path);
 870         dirp = SMB_VFS_NEXT_OPENDIR(handle, path, NULL, 0);
 871         if (!dirp) {
 872                 return -1;
 873         }
 874         while ((dire = SMB_VFS_NEXT_READDIR(handle, dirp, NULL)) != NULL) {
 875                 if (ISDOT(dire->d_name) || ISDOTDOT(dire->d_name)) {
 876                         continue;
 877                 }
 878                 have_files = true;
 879                 if (!is_scannedonly_file(STRUCTSCANO(handle->data),
 880                                          dire->d_name)) {
 881                         struct smb_filename *smb_fname = NULL;
 882                         char *fullpath;
 883                         int retval;
 884
 885                         if (STRUCTSCANO(handle->data)->show_special_files) {
 886                                 only_deletable_files = false;
 887                                 break;
 888                         }
 889                         /* stat the file and see if it is a
 890                            special file */
 891                         fullpath = talloc_asprintf(ctx, "%s%s", path_w_slash,
 892                                                   dire->d_name);
 893                         smb_fname = synthetic_smb_fname(ctx, fullpath,
 894                                                         NULL,NULL);
 895                         retval = SMB_VFS_NEXT_STAT(handle, smb_fname);
 896                         if (retval == 0
 897                             && S_ISREG(smb_fname->st.st_ex_mode)) {
 898                                 only_deletable_files = false;
 899                         }
 900                         TALLOC_FREE(fullpath);
 901                         TALLOC_FREE(smb_fname);
 902                         break;
 903                 }
 904         }
 905         DEBUG(SCANNEDONLY_DEBUG,
 906               ("path=%s, have_files=%d, only_deletable_files=%d\n",
 907                path, have_files, only_deletable_files));
 908         if (have_files && only_deletable_files) {
 909                 DEBUG(SCANNEDONLY_DEBUG,
 910                       ("scannedonly_rmdir, remove leftover scannedonly "
 911                        "files from %s\n", path_w_slash));
 912                 SMB_VFS_NEXT_REWINDDIR(handle, dirp);
 913                 while ((dire = SMB_VFS_NEXT_READDIR(handle, dirp, NULL))
 914                        != NULL) {
 915                         char *fullpath;
 916                         struct smb_filename *smb_fname = NULL;
 917                         if (ISDOT(dire->d_name) || ISDOTDOT(dire->d_name)) {
 918                                 continue;
 919                         }
 920                         fullpath = talloc_asprintf(ctx, "%s%s", path_w_slash,
 921                                                   dire->d_name);
 922                         smb_fname = synthetic_smb_fname(ctx, fullpath,
 923                                                         NULL,NULL);
 924                         DEBUG(SCANNEDONLY_DEBUG, ("unlink %s\n", fullpath));
 925                         SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 926                         TALLOC_FREE(fullpath);
 927                         TALLOC_FREE(smb_fname);
 928                 }
 929         }
 930         SMB_VFS_NEXT_CLOSEDIR(handle, dirp);
 931         return SMB_VFS_NEXT_RMDIR(handle, path);
 932 }
 933
 934 static void free_scannedonly_data(void **data)
 935 {
 936         SAFE_FREE(*data);
 937 }
 938
 939 static int scannedonly_connect(struct vfs_handle_struct *handle,
 940                                const char *service, const char *user)
 941 {
 942
 943         struct Tscannedonly *so;
 944
 945         so = SMB_MALLOC_P(struct Tscannedonly);
 946         if (so == NULL) {
 947                 errno = ENOMEM;
 948                 return -1;
 949         }
 950         handle->data = (void *)so;
 951         handle->free_data = free_scannedonly_data;
 952         so->gsendbuffer[0]='\0';
 953         so->domain_socket =
 954                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 955                              "domain_socket", True);
 956         so->socketname = lp_parm_const_string(SNUM(handle->conn),
 957                                              "scannedonly", "socketname",
 958                                              "/var/lib/scannedonly/scan");
 959
 960         so->portnum =
 961                 lp_parm_int(SNUM(handle->conn), "scannedonly", "portnum",
 962                             2020);
 963         so->scanhost = lp_parm_const_string(SNUM(handle->conn),
 964                                              "scannedonly", "scanhost",
 965                                              "localhost");
 966
 967         so->show_special_files =
 968                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 969                              "show_special_files", True);
 970         so->rm_hidden_files_on_rmdir =
 971                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 972                              "rm_hidden_files_on_rmdir", True);
 973         so->hide_nonscanned_files =
 974                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 975                              "hide_nonscanned_files", False);
 976         so->allow_nonscanned_files =
 977                 lp_parm_bool(SNUM(handle->conn), "scannedonly",
 978                              "allow_nonscanned_files", False);
 979         so->scanning_message = lp_parm_const_string(SNUM(handle->conn),
 980                                              "scannedonly",
 981                                              "scanning_message",
 982                                              "is being scanned for viruses");
 983         so->scanning_message_len = strlen(so->scanning_message);
 984         so->recheck_time_open =
 985                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 986                             "recheck_time_open", 50);
 987         so->recheck_tries_open =
 988                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 989                             "recheck_tries_open", 100);
 990         so->recheck_size_open =
 991                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 992                             "recheck_size_open", 100);
 993         so->recheck_time_readdir =
 994                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 995                             "recheck_time_readdir", 50);
 996         so->recheck_tries_readdir =
 997                 lp_parm_int(SNUM(handle->conn), "scannedonly",
 998                             "recheck_tries_readdir", 20);
 999
1000         so->p_scanned =
1001                 lp_parm_const_string(SNUM(handle->conn),
1002                                              "scannedonly",
1003                                              "pref_scanned",
1004                                              ".scanned:");
1005         so->p_virus =
1006                 lp_parm_const_string(SNUM(handle->conn),
1007                                              "scannedonly",
1008                                              "pref_virus",
1009                                              ".virus:");
1010         so->p_failed =
1011                 lp_parm_const_string(SNUM(handle->conn),
1012                                              "scannedonly",
1013                                              "pref_failed",
1014                                              ".failed:");
1015         connect_to_scanner(handle);
1016
1017         return SMB_VFS_NEXT_CONNECT(handle, service, user);
1018 }
1019
1020 /* VFS operations structure */
1021 static struct vfs_fn_pointers vfs_scannedonly_fns = {
1022         .opendir_fn = scannedonly_opendir,
1023         .fdopendir_fn = scannedonly_fdopendir,
1024         .readdir_fn = scannedonly_readdir,
1025         .seekdir_fn = scannedonly_seekdir,
1026         .telldir_fn = scannedonly_telldir,
1027         .rewind_dir_fn = scannedonly_rewinddir,
1028         .closedir_fn = scannedonly_closedir,
1029         .rmdir_fn = scannedonly_rmdir,
1030         .stat_fn = scannedonly_stat,
1031         .lstat_fn = scannedonly_lstat,
1032         .open_fn = scannedonly_open,
1033         .close_fn = scannedonly_close,
1034         .rename_fn = scannedonly_rename,
1035         .unlink_fn = scannedonly_unlink,
1036         .connect_fn = scannedonly_connect
1037 };
1038
1039 NTSTATUS vfs_scannedonly_init(void)
1040 {
1041         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "scannedonly",
1042                                 &vfs_scannedonly_fns);
1043 }