source3/lib/util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2001-2007
   6    Copyright (C) Simo Sorce 2001
   7    Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
   8    Copyright (C) James Peach 2006
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/passwd.h"
  26 #include "system/filesys.h"
  27 #include "lib/util/server_id.h"
  28 #include "util_tdb.h"
  29 #include "ctdbd_conn.h"
  30 #include "../lib/util/util_pw.h"
  31 #include "messages.h"
  32 #include "messages_dgm.h"
  33 #include "libcli/security/security.h"
  34 #include "serverid.h"
  35 #include "lib/util/sys_rw.h"
  36 #include "lib/util/sys_rw_data.h"
  37 #include "lib/util/util_process.h"
  38 #include "lib/dbwrap/dbwrap_ctdb.h"
  39 #include "lib/gencache.h"
  40
  41 #ifdef HAVE_SYS_PRCTL_H
  42 #include <sys/prctl.h>
  43 #endif
  44
  45 /* Max allowable allococation - 256mb - 0x10000000 */
  46 #define MAX_ALLOC_SIZE (1024*1024*256)
  47
  48 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
  49 /* rpc/xdr.h uses TRUE and FALSE */
  50 #ifdef TRUE
  51 #undef TRUE
  52 #endif
  53
  54 #ifdef FALSE
  55 #undef FALSE
  56 #endif
  57
  58 #include "system/nis.h"
  59
  60 #ifdef WITH_NISPLUS_HOME
  61 #ifdef BROKEN_NISPLUS_INCLUDE_FILES
  62 /*
  63  * The following lines are needed due to buggy include files
  64  * in Solaris 2.6 which define GROUP in both /usr/include/sys/acl.h and
  65  * also in /usr/include/rpcsvc/nis.h. The definitions conflict. JRA.
  66  * Also GROUP_OBJ is defined as 0x4 in /usr/include/sys/acl.h and as
  67  * an enum in /usr/include/rpcsvc/nis.h.
  68  */
  69
  70 #if defined(GROUP)
  71 #undef GROUP
  72 #endif
  73
  74 #if defined(GROUP_OBJ)
  75 #undef GROUP_OBJ
  76 #endif
  77
  78 #endif /* BROKEN_NISPLUS_INCLUDE_FILES */
  79
  80 #include <rpcsvc/nis.h>
  81
  82 #endif /* WITH_NISPLUS_HOME */
  83 #endif /* HAVE_NETGROUP && WITH_AUTOMOUNT */
  84
  85 static enum protocol_types Protocol = PROTOCOL_COREPLUS;
  86
  87 enum protocol_types get_Protocol(void)
  88 {
  89         return Protocol;
  90 }
  91
  92 void set_Protocol(enum protocol_types  p)
  93 {
  94         Protocol = p;
  95 }
  96
  97 static enum remote_arch_types ra_type = RA_UNKNOWN;
  98
  99 void gfree_all( void )
 100 {
 101         gfree_names();
 102         gfree_loadparm();
 103         gfree_charcnv();
 104         gfree_interfaces();
 105         gfree_debugsyms();
 106 }
 107
 108 /*******************************************************************
 109  Check if a file exists - call vfs_file_exist for samba files.
 110 ********************************************************************/
 111
 112 bool file_exist_stat(const char *fname,SMB_STRUCT_STAT *sbuf,
 113                      bool fake_dir_create_times)
 114 {
 115         SMB_STRUCT_STAT st;
 116         if (!sbuf)
 117                 sbuf = &st;
 118
 119         if (sys_stat(fname, sbuf, fake_dir_create_times) != 0)
 120                 return(False);
 121
 122         return((S_ISREG(sbuf->st_ex_mode)) || (S_ISFIFO(sbuf->st_ex_mode)));
 123 }
 124
 125 /*******************************************************************
 126  Check if a unix domain socket exists - call vfs_file_exist for samba files.
 127 ********************************************************************/
 128
 129 bool socket_exist(const char *fname)
 130 {
 131         SMB_STRUCT_STAT st;
 132         if (sys_stat(fname, &st, false) != 0)
 133                 return(False);
 134
 135         return S_ISSOCK(st.st_ex_mode);
 136 }
 137
 138 /*******************************************************************
 139  Returns the size in bytes of the named given the stat struct.
 140 ********************************************************************/
 141
 142 uint64_t get_file_size_stat(const SMB_STRUCT_STAT *sbuf)
 143 {
 144         return sbuf->st_ex_size;
 145 }
 146
 147 /****************************************************************************
 148  Check two stats have identical dev and ino fields.
 149 ****************************************************************************/
 150
 151 bool check_same_dev_ino(const SMB_STRUCT_STAT *sbuf1,
 152                         const SMB_STRUCT_STAT *sbuf2)
 153 {
 154         if (sbuf1->st_ex_dev != sbuf2->st_ex_dev ||
 155                         sbuf1->st_ex_ino != sbuf2->st_ex_ino) {
 156                 return false;
 157         }
 158         return true;
 159 }
 160
 161 /****************************************************************************
 162  Check if a stat struct is identical for use.
 163 ****************************************************************************/
 164
 165 bool check_same_stat(const SMB_STRUCT_STAT *sbuf1,
 166                         const SMB_STRUCT_STAT *sbuf2)
 167 {
 168         if (sbuf1->st_ex_uid != sbuf2->st_ex_uid ||
 169                         sbuf1->st_ex_gid != sbuf2->st_ex_gid ||
 170                         !check_same_dev_ino(sbuf1, sbuf2)) {
 171                 return false;
 172         }
 173         return true;
 174 }
 175
 176 /*******************************************************************
 177  Show a smb message structure.
 178 ********************************************************************/
 179
 180 void show_msg(const char *buf)
 181 {
 182         int i;
 183         int bcc=0;
 184
 185         if (!DEBUGLVL(5))
 186                 return;
 187
 188         DEBUG(5,("size=%d\nsmb_com=0x%x\nsmb_rcls=%d\nsmb_reh=%d\nsmb_err=%d\nsmb_flg=%d\nsmb_flg2=%d\n",
 189                         smb_len(buf),
 190                         (int)CVAL(buf,smb_com),
 191                         (int)CVAL(buf,smb_rcls),
 192                         (int)CVAL(buf,smb_reh),
 193                         (int)SVAL(buf,smb_err),
 194                         (int)CVAL(buf,smb_flg),
 195                         (int)SVAL(buf,smb_flg2)));
 196         DEBUGADD(5,("smb_tid=%d\nsmb_pid=%d\nsmb_uid=%d\nsmb_mid=%d\n",
 197                         (int)SVAL(buf,smb_tid),
 198                         (int)SVAL(buf,smb_pid),
 199                         (int)SVAL(buf,smb_uid),
 200                         (int)SVAL(buf,smb_mid)));
 201         DEBUGADD(5,("smt_wct=%d\n",(int)CVAL(buf,smb_wct)));
 202
 203         for (i=0;i<(int)CVAL(buf,smb_wct);i++)
 204                 DEBUGADD(5,("smb_vwv[%2d]=%5d (0x%X)\n",i,
 205                         SVAL(buf,smb_vwv+2*i),SVAL(buf,smb_vwv+2*i)));
 206
 207         bcc = (int)SVAL(buf,smb_vwv+2*(CVAL(buf,smb_wct)));
 208
 209         DEBUGADD(5,("smb_bcc=%d\n",bcc));
 210
 211         if (DEBUGLEVEL < 10)
 212                 return;
 213
 214         if (DEBUGLEVEL < 50)
 215                 bcc = MIN(bcc, 512);
 216
 217         dump_data(10, (const uint8_t *)smb_buf_const(buf), bcc);
 218 }
 219
 220 /*******************************************************************
 221  Setup only the byte count for a smb message.
 222 ********************************************************************/
 223
 224 int set_message_bcc(char *buf,int num_bytes)
 225 {
 226         int num_words = CVAL(buf,smb_wct);
 227         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
 228         _smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
 229         return (smb_size + num_words*2 + num_bytes);
 230 }
 231
 232 /*******************************************************************
 233  Add a data blob to the end of a smb_buf, adjusting bcc and smb_len.
 234  Return the bytes added
 235 ********************************************************************/
 236
 237 ssize_t message_push_blob(uint8_t **outbuf, DATA_BLOB blob)
 238 {
 239         size_t newlen = smb_len(*outbuf) + 4 + blob.length;
 240         uint8_t *tmp;
 241
 242         if (!(tmp = talloc_realloc(NULL, *outbuf, uint8_t, newlen))) {
 243                 DEBUG(0, ("talloc failed\n"));
 244                 return -1;
 245         }
 246         *outbuf = tmp;
 247
 248         memcpy(tmp + smb_len(tmp) + 4, blob.data, blob.length);
 249         set_message_bcc((char *)tmp, smb_buflen(tmp) + blob.length);
 250         return blob.length;
 251 }
 252
 253 /*******************************************************************
 254  Reduce a file name, removing .. elements.
 255 ********************************************************************/
 256
 257 static char *dos_clean_name(TALLOC_CTX *ctx, const char *s)
 258 {
 259         char *p = NULL;
 260         char *str = NULL;
 261
 262         DEBUG(3,("dos_clean_name [%s]\n",s));
 263
 264         /* remove any double slashes */
 265         str = talloc_all_string_sub(ctx, s, "\\\\", "\\");
 266         if (!str) {
 267                 return NULL;
 268         }
 269
 270         /* Remove leading .\\ characters */
 271         if(strncmp(str, ".\\", 2) == 0) {
 272                 trim_string(str, ".\\", NULL);
 273                 if(*str == 0) {
 274                         str = talloc_strdup(ctx, ".\\");
 275                         if (!str) {
 276                                 return NULL;
 277                         }
 278                 }
 279         }
 280
 281         while ((p = strstr_m(str,"\\..\\")) != NULL) {
 282                 char *s1;
 283
 284                 *p = 0;
 285                 s1 = p+3;
 286
 287                 if ((p=strrchr_m(str,'\\')) != NULL) {
 288                         *p = 0;
 289                 } else {
 290                         *str = 0;
 291                 }
 292                 str = talloc_asprintf(ctx,
 293                                 "%s%s",
 294                                 str,
 295                                 s1);
 296                 if (!str) {
 297                         return NULL;
 298                 }
 299         }
 300
 301         trim_string(str,NULL,"\\..");
 302         return talloc_all_string_sub(ctx, str, "\\.\\", "\\");
 303 }
 304
 305 /*******************************************************************
 306  Reduce a file name, removing .. elements.
 307 ********************************************************************/
 308
 309 char *unix_clean_name(TALLOC_CTX *ctx, const char *s)
 310 {
 311         char *p = NULL;
 312         char *str = NULL;
 313
 314         DEBUG(3,("unix_clean_name [%s]\n",s));
 315
 316         /* remove any double slashes */
 317         str = talloc_all_string_sub(ctx, s, "//","/");
 318         if (!str) {
 319                 return NULL;
 320         }
 321
 322         /* Remove leading ./ characters */
 323         if(strncmp(str, "./", 2) == 0) {
 324                 trim_string(str, "./", NULL);
 325                 if(*str == 0) {
 326                         str = talloc_strdup(ctx, "./");
 327                         if (!str) {
 328                                 return NULL;
 329                         }
 330                 }
 331         }
 332
 333         while ((p = strstr_m(str,"/../")) != NULL) {
 334                 char *s1;
 335
 336                 *p = 0;
 337                 s1 = p+3;
 338
 339                 if ((p=strrchr_m(str,'/')) != NULL) {
 340                         *p = 0;
 341                 } else {
 342                         *str = 0;
 343                 }
 344                 str = talloc_asprintf(ctx,
 345                                 "%s%s",
 346                                 str,
 347                                 s1);
 348                 if (!str) {
 349                         return NULL;
 350                 }
 351         }
 352
 353         trim_string(str,NULL,"/..");
 354         return talloc_all_string_sub(ctx, str, "/./", "/");
 355 }
 356
 357 char *clean_name(TALLOC_CTX *ctx, const char *s)
 358 {
 359         char *str = dos_clean_name(ctx, s);
 360         if (!str) {
 361                 return NULL;
 362         }
 363         return unix_clean_name(ctx, str);
 364 }
 365
 366 /*******************************************************************
 367  Write data into an fd at a given offset. Ignore seek errors.
 368 ********************************************************************/
 369
 370 ssize_t write_data_at_offset(int fd, const char *buffer, size_t N, off_t pos)
 371 {
 372         size_t total=0;
 373         ssize_t ret;
 374
 375         if (pos == (off_t)-1) {
 376                 return write_data(fd, buffer, N);
 377         }
 378 #if defined(HAVE_PWRITE) || defined(HAVE_PRWITE64)
 379         while (total < N) {
 380                 ret = sys_pwrite(fd,buffer + total,N - total, pos);
 381                 if (ret == -1 && errno == ESPIPE) {
 382                         return write_data(fd, buffer + total,N - total);
 383                 }
 384                 if (ret == -1) {
 385                         DEBUG(0,("write_data_at_offset: write failure. Error = %s\n", strerror(errno) ));
 386                         return -1;
 387                 }
 388                 if (ret == 0) {
 389                         return total;
 390                 }
 391                 total += ret;
 392                 pos += ret;
 393         }
 394         return (ssize_t)total;
 395 #else
 396         /* Use lseek and write_data. */
 397         if (lseek(fd, pos, SEEK_SET) == -1) {
 398                 if (errno != ESPIPE) {
 399                         return -1;
 400                 }
 401         }
 402         return write_data(fd, buffer, N);
 403 #endif
 404 }
 405
 406 static int reinit_after_fork_pipe[2] = { -1, -1 };
 407
 408 NTSTATUS init_before_fork(void)
 409 {
 410         int ret;
 411
 412         ret = pipe(reinit_after_fork_pipe);
 413         if (ret == -1) {
 414                 NTSTATUS status;
 415
 416                 status = map_nt_error_from_unix_common(errno);
 417
 418                 DEBUG(0, ("Error creating child_pipe: %s\n",
 419                           nt_errstr(status)));
 420
 421                 return status;
 422         }
 423
 424         return NT_STATUS_OK;
 425 }
 426
 427 /**
 428  * Detect died parent by detecting EOF on the pipe
 429  */
 430 static void reinit_after_fork_pipe_handler(struct tevent_context *ev,
 431                                            struct tevent_fd *fde,
 432                                            uint16_t flags,
 433                                            void *private_data)
 434 {
 435         char c;
 436
 437         if (sys_read(reinit_after_fork_pipe[0], &c, 1) != 1) {
 438                 /*
 439                  * we have reached EOF on stdin, which means the
 440                  * parent has exited. Shutdown the server
 441                  */
 442                 TALLOC_FREE(fde);
 443                 (void)kill(getpid(), SIGTERM);
 444         }
 445 }
 446
 447
 448 NTSTATUS reinit_after_fork(struct messaging_context *msg_ctx,
 449                            struct tevent_context *ev_ctx,
 450                            bool parent_longlived,
 451                            const char *comment)
 452 {
 453         NTSTATUS status = NT_STATUS_OK;
 454         int ret;
 455
 456         /*
 457          * The main process thread should never
 458          * allow per_thread_cwd_enable() to be
 459          * called.
 460          */
 461         per_thread_cwd_disable();
 462
 463         if (reinit_after_fork_pipe[1] != -1) {
 464                 close(reinit_after_fork_pipe[1]);
 465                 reinit_after_fork_pipe[1] = -1;
 466         }
 467
 468         /* tdb needs special fork handling */
 469         if (tdb_reopen_all(parent_longlived ? 1 : 0) != 0) {
 470                 DEBUG(0,("tdb_reopen_all failed.\n"));
 471                 status = NT_STATUS_OPEN_FAILED;
 472                 goto done;
 473         }
 474
 475         if (ev_ctx != NULL) {
 476                 tevent_set_trace_callback(ev_ctx, NULL, NULL);
 477                 if (tevent_re_initialise(ev_ctx) != 0) {
 478                         smb_panic(__location__ ": Failed to re-initialise event context");
 479                 }
 480         }
 481
 482         if (reinit_after_fork_pipe[0] != -1) {
 483                 struct tevent_fd *fde;
 484
 485                 fde = tevent_add_fd(ev_ctx, ev_ctx /* TALLOC_CTX */,
 486                                     reinit_after_fork_pipe[0], TEVENT_FD_READ,
 487                                     reinit_after_fork_pipe_handler, NULL);
 488                 if (fde == NULL) {
 489                         smb_panic(__location__ ": Failed to add reinit_after_fork pipe event");
 490                 }
 491         }
 492
 493         if (msg_ctx) {
 494                 /*
 495                  * For clustering, we need to re-init our ctdbd connection after the
 496                  * fork
 497                  */
 498                 status = messaging_reinit(msg_ctx);
 499                 if (!NT_STATUS_IS_OK(status)) {
 500                         DEBUG(0,("messaging_reinit() failed: %s\n",
 501                                  nt_errstr(status)));
 502                 }
 503
 504                 if (lp_clustering()) {
 505                         ret = ctdb_async_ctx_reinit(
 506                                 NULL, messaging_tevent_context(msg_ctx));
 507                         if (ret != 0) {
 508                                 DBG_ERR("db_ctdb_async_ctx_reinit failed: %s\n",
 509                                         strerror(errno));
 510                                 return map_nt_error_from_unix(ret);
 511                         }
 512                 }
 513         }
 514
 515         if (comment) {
 516                 prctl_set_comment(comment);
 517         }
 518
 519  done:
 520         return status;
 521 }
 522
 523 /****************************************************************************
 524  (Hopefully) efficient array append.
 525 ****************************************************************************/
 526
 527 void add_to_large_array(TALLOC_CTX *mem_ctx, size_t element_size,
 528                         void *element, void *_array, uint32_t *num_elements,
 529                         ssize_t *array_size)
 530 {
 531         void **array = (void **)_array;
 532
 533         if (*array_size < 0) {
 534                 return;
 535         }
 536
 537         if (*array == NULL) {
 538                 if (*array_size == 0) {
 539                         *array_size = 128;
 540                 }
 541
 542                 if (*array_size >= MAX_ALLOC_SIZE/element_size) {
 543                         goto error;
 544                 }
 545
 546                 *array = TALLOC(mem_ctx, element_size * (*array_size));
 547                 if (*array == NULL) {
 548                         goto error;
 549                 }
 550         }
 551
 552         if (*num_elements == *array_size) {
 553                 *array_size *= 2;
 554
 555                 if (*array_size >= MAX_ALLOC_SIZE/element_size) {
 556                         goto error;
 557                 }
 558
 559                 *array = TALLOC_REALLOC(mem_ctx, *array,
 560                                         element_size * (*array_size));
 561
 562                 if (*array == NULL) {
 563                         goto error;
 564                 }
 565         }
 566
 567         memcpy((char *)(*array) + element_size*(*num_elements),
 568                element, element_size);
 569         *num_elements += 1;
 570
 571         return;
 572
 573  error:
 574         *num_elements = 0;
 575         *array_size = -1;
 576 }
 577
 578 /****************************************************************************
 579  Get my own domain name, or "" if we have none.
 580 ****************************************************************************/
 581
 582 char *get_mydnsdomname(TALLOC_CTX *ctx)
 583 {
 584         const char *domname;
 585         char *p;
 586
 587         domname = get_mydnsfullname();
 588         if (!domname) {
 589                 return NULL;
 590         }
 591
 592         p = strchr_m(domname, '.');
 593         if (p) {
 594                 p++;
 595                 return talloc_strdup(ctx, p);
 596         } else {
 597                 return talloc_strdup(ctx, "");
 598         }
 599 }
 600
 601 #if (defined(HAVE_NETGROUP) && defined(WITH_AUTOMOUNT))
 602 /******************************************************************
 603  Remove any mount options such as -rsize=2048,wsize=2048 etc.
 604  Based on a fix from <Thomas.Hepper@icem.de>.
 605  Returns a malloc'ed string.
 606 *******************************************************************/
 607
 608 static char *strip_mount_options(TALLOC_CTX *ctx, const char *str)
 609 {
 610         if (*str == '-') {
 611                 const char *p = str;
 612                 while(*p && !isspace(*p))
 613                         p++;
 614                 while(*p && isspace(*p))
 615                         p++;
 616                 if(*p) {
 617                         return talloc_strdup(ctx, p);
 618                 }
 619         }
 620         return NULL;
 621 }
 622
 623 /*******************************************************************
 624  Patch from jkf@soton.ac.uk
 625  Split Luke's automount_server into YP lookup and string splitter
 626  so can easily implement automount_path().
 627  Returns a malloc'ed string.
 628 *******************************************************************/
 629
 630 #ifdef WITH_NISPLUS_HOME
 631 char *automount_lookup(TALLOC_CTX *ctx, const char *user_name)
 632 {
 633         char *value = NULL;
 634
 635         char *nis_map = (char *)lp_homedir_map();
 636
 637         char buffer[NIS_MAXATTRVAL + 1];
 638         nis_result *result;
 639         nis_object *object;
 640         entry_obj  *entry;
 641
 642         snprintf(buffer, sizeof(buffer), "[key=%s],%s", user_name, nis_map);
 643         DEBUG(5, ("NIS+ querystring: %s\n", buffer));
 644
 645         if (result = nis_list(buffer, FOLLOW_PATH|EXPAND_NAME|HARD_LOOKUP, NULL, NULL)) {
 646                 if (result->status != NIS_SUCCESS) {
 647                         DEBUG(3, ("NIS+ query failed: %s\n", nis_sperrno(result->status)));
 648                 } else {
 649                         object = result->objects.objects_val;
 650                         if (object->zo_data.zo_type == ENTRY_OBJ) {
 651                                 entry = &object->zo_data.objdata_u.en_data;
 652                                 DEBUG(5, ("NIS+ entry type: %s\n", entry->en_type));
 653                                 DEBUG(3, ("NIS+ result: %s\n", entry->en_cols.en_cols_val[1].ec_value.ec_value_val));
 654
 655                                 value = talloc_strdup(ctx,
 656                                                 entry->en_cols.en_cols_val[1].ec_value.ec_value_val);
 657                                 if (!value) {
 658                                         nis_freeresult(result);
 659                                         return NULL;
 660                                 }
 661                                 value = talloc_string_sub(ctx,
 662                                                 value,
 663                                                 "&",
 664                                                 user_name);
 665                         }
 666                 }
 667         }
 668         nis_freeresult(result);
 669
 670         if (value) {
 671                 value = strip_mount_options(ctx, value);
 672                 DEBUG(4, ("NIS+ Lookup: %s resulted in %s\n",
 673                                         user_name, value));
 674         }
 675         return value;
 676 }
 677 #else /* WITH_NISPLUS_HOME */
 678
 679 char *automount_lookup(TALLOC_CTX *ctx, const char *user_name)
 680 {
 681         char *value = NULL;
 682
 683         int nis_error;        /* returned by yp all functions */
 684         char *nis_result;     /* yp_match inits this */
 685         int nis_result_len;  /* and set this */
 686         char *nis_domain;     /* yp_get_default_domain inits this */
 687         char *nis_map = lp_homedir_map(talloc_tos());
 688
 689         if ((nis_error = yp_get_default_domain(&nis_domain)) != 0) {
 690                 DEBUG(3, ("YP Error: %s\n", yperr_string(nis_error)));
 691                 return NULL;
 692         }
 693
 694         DEBUG(5, ("NIS Domain: %s\n", nis_domain));
 695
 696         if ((nis_error = yp_match(nis_domain, nis_map, user_name,
 697                                         strlen(user_name), &nis_result,
 698                                         &nis_result_len)) == 0) {
 699                 if (nis_result_len > 0 && nis_result[nis_result_len] == '\n') {
 700                         nis_result[nis_result_len] = '\0';
 701                 }
 702                 value = talloc_strdup(ctx, nis_result);
 703                 if (!value) {
 704                         return NULL;
 705                 }
 706                 value = strip_mount_options(ctx, value);
 707         } else if(nis_error == YPERR_KEY) {
 708                 DEBUG(3, ("YP Key not found:  while looking up \"%s\" in map \"%s\"\n",
 709                                 user_name, nis_map));
 710                 DEBUG(3, ("using defaults for server and home directory\n"));
 711         } else {
 712                 DEBUG(3, ("YP Error: \"%s\" while looking up \"%s\" in map \"%s\"\n",
 713                                 yperr_string(nis_error), user_name, nis_map));
 714         }
 715
 716         if (value) {
 717                 DEBUG(4, ("YP Lookup: %s resulted in %s\n", user_name, value));
 718         }
 719         return value;
 720 }
 721 #endif /* WITH_NISPLUS_HOME */
 722 #endif
 723
 724 bool process_exists(const struct server_id pid)
 725 {
 726         return serverid_exists(&pid);
 727 }
 728
 729 /*******************************************************************
 730  Convert a uid into a user name.
 731 ********************************************************************/
 732
 733 const char *uidtoname(uid_t uid)
 734 {
 735         TALLOC_CTX *ctx = talloc_tos();
 736         char *name = NULL;
 737         struct passwd *pass = NULL;
 738
 739         pass = getpwuid_alloc(ctx,uid);
 740         if (pass) {
 741                 name = talloc_strdup(ctx,pass->pw_name);
 742                 TALLOC_FREE(pass);
 743         } else {
 744                 name = talloc_asprintf(ctx,
 745                                 "%ld",
 746                                 (long int)uid);
 747         }
 748         return name;
 749 }
 750
 751 /*******************************************************************
 752  Convert a gid into a group name.
 753 ********************************************************************/
 754
 755 char *gidtoname(gid_t gid)
 756 {
 757         struct group *grp;
 758
 759         grp = getgrgid(gid);
 760         if (grp) {
 761                 return talloc_strdup(talloc_tos(), grp->gr_name);
 762         }
 763         else {
 764                 return talloc_asprintf(talloc_tos(),
 765                                         "%d",
 766                                         (int)gid);
 767         }
 768 }
 769
 770 /*******************************************************************
 771  Convert a user name into a uid.
 772 ********************************************************************/
 773
 774 uid_t nametouid(const char *name)
 775 {
 776         struct passwd *pass;
 777         char *p;
 778         uid_t u;
 779
 780         pass = Get_Pwnam_alloc(talloc_tos(), name);
 781         if (pass) {
 782                 u = pass->pw_uid;
 783                 TALLOC_FREE(pass);
 784                 return u;
 785         }
 786
 787         u = (uid_t)strtol(name, &p, 0);
 788         if ((p != name) && (*p == '\0'))
 789                 return u;
 790
 791         return (uid_t)-1;
 792 }
 793
 794 /*******************************************************************
 795  Convert a name to a gid_t if possible. Return -1 if not a group.
 796 ********************************************************************/
 797
 798 gid_t nametogid(const char *name)
 799 {
 800         struct group *grp;
 801         char *p;
 802         gid_t g;
 803
 804         g = (gid_t)strtol(name, &p, 0);
 805         if ((p != name) && (*p == '\0'))
 806                 return g;
 807
 808         grp = getgrnam(name);
 809         if (grp)
 810                 return(grp->gr_gid);
 811         return (gid_t)-1;
 812 }
 813
 814 /*******************************************************************
 815  Something really nasty happened - panic !
 816 ********************************************************************/
 817
 818 void smb_panic_s3(const char *why)
 819 {
 820         char *cmd;
 821         int result;
 822
 823         DEBUG(0,("PANIC (pid %llu): %s\n",
 824                     (unsigned long long)getpid(), why));
 825         log_stack_trace();
 826
 827 #if defined(HAVE_PRCTL) && defined(PR_SET_PTRACER)
 828         /*
 829          * Make sure all children can attach a debugger.
 830          */
 831         prctl(PR_SET_PTRACER, getpid(), 0, 0, 0);
 832 #endif
 833
 834         cmd = lp_panic_action(talloc_tos());
 835         if (cmd && *cmd) {
 836                 DEBUG(0, ("smb_panic(): calling panic action [%s]\n", cmd));
 837                 result = system(cmd);
 838
 839                 if (result == -1)
 840                         DEBUG(0, ("smb_panic(): fork failed in panic action: %s\n",
 841                                           strerror(errno)));
 842                 else
 843                         DEBUG(0, ("smb_panic(): action returned status %d\n",
 844                                           WEXITSTATUS(result)));
 845         }
 846
 847         dump_core();
 848 }
 849
 850 /*******************************************************************
 851   A readdir wrapper which just returns the file name.
 852  ********************************************************************/
 853
 854 const char *readdirname(DIR *p)
 855 {
 856         struct dirent *ptr;
 857         char *dname;
 858
 859         if (!p)
 860                 return(NULL);
 861
 862         ptr = (struct dirent *)readdir(p);
 863         if (!ptr)
 864                 return(NULL);
 865
 866         dname = ptr->d_name;
 867
 868 #ifdef NEXT2
 869         if (telldir(p) < 0)
 870                 return(NULL);
 871 #endif
 872
 873 #ifdef HAVE_BROKEN_READDIR_NAME
 874         /* using /usr/ucb/cc is BAD */
 875         dname = dname - 2;
 876 #endif
 877
 878         return talloc_strdup(talloc_tos(), dname);
 879 }
 880
 881 /*******************************************************************
 882  Utility function used to decide if the last component
 883  of a path matches a (possibly wildcarded) entry in a namelist.
 884 ********************************************************************/
 885
 886 bool is_in_path(const char *name, name_compare_entry *namelist, bool case_sensitive)
 887 {
 888         const char *last_component;
 889
 890         /* if we have no list it's obviously not in the path */
 891         if((namelist == NULL ) || ((namelist != NULL) && (namelist[0].name == NULL))) {
 892                 return False;
 893         }
 894
 895         DEBUG(8, ("is_in_path: %s\n", name));
 896
 897         /* Get the last component of the unix name. */
 898         last_component = strrchr_m(name, '/');
 899         if (!last_component) {
 900                 last_component = name;
 901         } else {
 902                 last_component++; /* Go past '/' */
 903         }
 904
 905         for(; namelist->name != NULL; namelist++) {
 906                 if(namelist->is_wild) {
 907                         if (mask_match(last_component, namelist->name, case_sensitive)) {
 908                                 DEBUG(8,("is_in_path: mask match succeeded\n"));
 909                                 return True;
 910                         }
 911                 } else {
 912                         if((case_sensitive && (strcmp(last_component, namelist->name) == 0))||
 913                                                 (!case_sensitive && (strcasecmp_m(last_component, namelist->name) == 0))) {
 914                                 DEBUG(8,("is_in_path: match succeeded\n"));
 915                                 return True;
 916                         }
 917                 }
 918         }
 919         DEBUG(8,("is_in_path: match not found\n"));
 920         return False;
 921 }
 922
 923 /*******************************************************************
 924  Strip a '/' separated list into an array of
 925  name_compare_enties structures suitable for
 926  passing to is_in_path(). We do this for
 927  speed so we can pre-parse all the names in the list
 928  and don't do it for each call to is_in_path().
 929  We also check if the entry contains a wildcard to
 930  remove a potentially expensive call to mask_match
 931  if possible.
 932 ********************************************************************/
 933
 934 void set_namearray(name_compare_entry **ppname_array, const char *namelist_in)
 935 {
 936         char *name_end;
 937         char *namelist;
 938         char *namelist_end;
 939         char *nameptr;
 940         int num_entries = 0;
 941         int i;
 942
 943         (*ppname_array) = NULL;
 944
 945         if((namelist_in == NULL ) || ((namelist_in != NULL) && (*namelist_in == '\0')))
 946                 return;
 947
 948         namelist = talloc_strdup(talloc_tos(), namelist_in);
 949         if (namelist == NULL) {
 950                 DEBUG(0,("set_namearray: talloc fail\n"));
 951                 return;
 952         }
 953         nameptr = namelist;
 954
 955         namelist_end = &namelist[strlen(namelist)];
 956
 957         /* We need to make two passes over the string. The
 958                 first to count the number of elements, the second
 959                 to split it.
 960         */
 961
 962         while(nameptr <= namelist_end) {
 963                 if ( *nameptr == '/' ) {
 964                         /* cope with multiple (useless) /s) */
 965                         nameptr++;
 966                         continue;
 967                 }
 968                 /* anything left? */
 969                 if ( *nameptr == '\0' )
 970                         break;
 971
 972                 /* find the next '/' or consume remaining */
 973                 name_end = strchr_m(nameptr, '/');
 974                 if (name_end == NULL) {
 975                         /* Point nameptr at the terminating '\0' */
 976                         nameptr += strlen(nameptr);
 977                 } else {
 978                         /* next segment please */
 979                         nameptr = name_end + 1;
 980                 }
 981                 num_entries++;
 982         }
 983
 984         if(num_entries == 0) {
 985                 talloc_free(namelist);
 986                 return;
 987         }
 988
 989         if(( (*ppname_array) = SMB_MALLOC_ARRAY(name_compare_entry, num_entries + 1)) == NULL) {
 990                 DEBUG(0,("set_namearray: malloc fail\n"));
 991                 talloc_free(namelist);
 992                 return;
 993         }
 994
 995         /* Now copy out the names */
 996         nameptr = namelist;
 997         i = 0;
 998         while(nameptr <= namelist_end) {
 999                 if ( *nameptr == '/' ) {
1000                         /* cope with multiple (useless) /s) */
1001                         nameptr++;
1002                         continue;
1003                 }
1004                 /* anything left? */
1005                 if ( *nameptr == '\0' )
1006                         break;
1007
1008                 /* find the next '/' or consume remaining */
1009                 name_end = strchr_m(nameptr, '/');
1010                 if (name_end != NULL) {
1011                         *name_end = '\0';
1012                 }
1013
1014                 (*ppname_array)[i].is_wild = ms_has_wild(nameptr);
1015                 if(((*ppname_array)[i].name = SMB_STRDUP(nameptr)) == NULL) {
1016                         DEBUG(0,("set_namearray: malloc fail (1)\n"));
1017                         talloc_free(namelist);
1018                         return;
1019                 }
1020
1021                 if (name_end == NULL) {
1022                         /* Point nameptr at the terminating '\0' */
1023                         nameptr += strlen(nameptr);
1024                 } else {
1025                         /* next segment please */
1026                         nameptr = name_end + 1;
1027                 }
1028                 i++;
1029         }
1030
1031         (*ppname_array)[i].name = NULL;
1032
1033         talloc_free(namelist);
1034         return;
1035 }
1036
1037 #undef DBGC_CLASS
1038 #define DBGC_CLASS DBGC_LOCKING
1039
1040 /****************************************************************************
1041  Simple routine to query existing file locks. Cruft in NFS and 64->32 bit mapping
1042  is dealt with in posix.c
1043  Returns True if we have information regarding this lock region (and returns
1044  F_UNLCK in *ptype if the region is unlocked). False if the call failed.
1045 ****************************************************************************/
1046
1047 bool fcntl_getlock(int fd, int op, off_t *poffset, off_t *pcount, int *ptype, pid_t *ppid)
1048 {
1049         struct flock lock;
1050         int ret;
1051
1052         DEBUG(8,("fcntl_getlock fd=%d op=%d offset=%.0f count=%.0f type=%d\n",
1053                     fd,op,(double)*poffset,(double)*pcount,*ptype));
1054
1055         lock.l_type = *ptype;
1056         lock.l_whence = SEEK_SET;
1057         lock.l_start = *poffset;
1058         lock.l_len = *pcount;
1059         lock.l_pid = 0;
1060
1061         ret = sys_fcntl_ptr(fd,op,&lock);
1062
1063         if (ret == -1) {
1064                 int sav = errno;
1065                 DEBUG(3,("fcntl_getlock: lock request failed at offset %.0f count %.0f type %d (%s)\n",
1066                         (double)*poffset,(double)*pcount,*ptype,strerror(errno)));
1067                 errno = sav;
1068                 return False;
1069         }
1070
1071         *ptype = lock.l_type;
1072         *poffset = lock.l_start;
1073         *pcount = lock.l_len;
1074         *ppid = lock.l_pid;
1075
1076         DEBUG(3,("fcntl_getlock: fd %d is returned info %d pid %u\n",
1077                         fd, (int)lock.l_type, (unsigned int)lock.l_pid));
1078         return True;
1079 }
1080
1081 #if defined(HAVE_OFD_LOCKS)
1082 int map_process_lock_to_ofd_lock(int op)
1083 {
1084         switch (op) {
1085         case F_GETLK:
1086         case F_OFD_GETLK:
1087                 op = F_OFD_GETLK;
1088                 break;
1089         case F_SETLK:
1090         case F_OFD_SETLK:
1091                 op = F_OFD_SETLK;
1092                 break;
1093         case F_SETLKW:
1094         case F_OFD_SETLKW:
1095                 op = F_OFD_SETLKW;
1096                 break;
1097         default:
1098                 return -1;
1099         }
1100         return op;
1101 }
1102 #else /* HAVE_OFD_LOCKS */
1103 int map_process_lock_to_ofd_lock(int op)
1104 {
1105         return op;
1106 }
1107 #endif /* HAVE_OFD_LOCKS */
1108
1109 #undef DBGC_CLASS
1110 #define DBGC_CLASS DBGC_ALL
1111
1112 /*******************************************************************
1113  Is the name specified one of my netbios names.
1114  Returns true if it is equal, false otherwise.
1115 ********************************************************************/
1116
1117 bool is_myname(const char *s)
1118 {
1119         int n;
1120         bool ret = False;
1121
1122         for (n=0; my_netbios_names(n); n++) {
1123                 const char *nbt_name = my_netbios_names(n);
1124
1125                 if (strncasecmp_m(nbt_name, s, MAX_NETBIOSNAME_LEN-1) == 0) {
1126                         ret=True;
1127                         break;
1128                 }
1129         }
1130         DEBUG(8, ("is_myname(\"%s\") returns %d\n", s, ret));
1131         return(ret);
1132 }
1133
1134 /*******************************************************************
1135  we distinguish between 2K and XP by the "Native Lan Manager" string
1136    WinXP => "Windows 2002 5.1"
1137    WinXP 64bit => "Windows XP 5.2"
1138    Win2k => "Windows 2000 5.0"
1139    NT4   => "Windows NT 4.0"
1140    Win9x => "Windows 4.0"
1141  Windows 2003 doesn't set the native lan manager string but
1142  they do set the domain to "Windows 2003 5.2" (probably a bug).
1143 ********************************************************************/
1144
1145 void ra_lanman_string( const char *native_lanman )
1146 {
1147         if ( strcmp( native_lanman, "Windows 2002 5.1" ) == 0 )
1148                 set_remote_arch( RA_WINXP );
1149         else if ( strcmp( native_lanman, "Windows XP 5.2" ) == 0 )
1150                 set_remote_arch( RA_WINXP64 );
1151         else if ( strcmp( native_lanman, "Windows Server 2003 5.2" ) == 0 )
1152                 set_remote_arch( RA_WIN2K3 );
1153 }
1154
1155 static const char *remote_arch_strings[] = {
1156         [RA_UNKNOWN] =  "UNKNOWN",
1157         [RA_WFWG] =     "WfWg",
1158         [RA_OS2] =      "OS2",
1159         [RA_WIN95] =    "Win95",
1160         [RA_WINNT] =    "WinNT",
1161         [RA_WIN2K] =    "Win2K",
1162         [RA_WINXP] =    "WinXP",
1163         [RA_WIN2K3] =   "Win2K3",
1164         [RA_VISTA] =    "Vista",
1165         [RA_SAMBA] =    "Samba",
1166         [RA_CIFSFS] =   "CIFSFS",
1167         [RA_WINXP64] =  "WinXP64",
1168         [RA_OSX] =      "OSX",
1169 };
1170
1171 const char *get_remote_arch_str(void)
1172 {
1173         if (ra_type >= ARRAY_SIZE(remote_arch_strings)) {
1174                 /*
1175                  * set_remote_arch() already checks this so ra_type
1176                  * should be in the allowed range, but anyway, let's
1177                  * do another bound check here.
1178                  */
1179                 DBG_ERR("Remote arch info out of sync [%d] missing\n", ra_type);
1180                 ra_type = RA_UNKNOWN;
1181         }
1182         return remote_arch_strings[ra_type];
1183 }
1184
1185 enum remote_arch_types get_remote_arch_from_str(const char *remote_arch_string)
1186 {
1187         int i;
1188
1189         for (i = 0; i < ARRAY_SIZE(remote_arch_strings); i++) {
1190                 if (strcmp(remote_arch_string, remote_arch_strings[i]) == 0) {
1191                         return i;
1192                 }
1193         }
1194         return RA_UNKNOWN;
1195 }
1196
1197 /*******************************************************************
1198  Set the horrid remote_arch string based on an enum.
1199 ********************************************************************/
1200
1201 void set_remote_arch(enum remote_arch_types type)
1202 {
1203         if (ra_type >= ARRAY_SIZE(remote_arch_strings)) {
1204                 /*
1205                  * This protects against someone adding values to enum
1206                  * remote_arch_types without updating
1207                  * remote_arch_strings array.
1208                  */
1209                 DBG_ERR("Remote arch info out of sync [%d] missing\n", ra_type);
1210                 ra_type = RA_UNKNOWN;
1211                 return;
1212         }
1213
1214         ra_type = type;
1215         DEBUG(10,("set_remote_arch: Client arch is \'%s\'\n",
1216                   get_remote_arch_str()));
1217 }
1218
1219 /*******************************************************************
1220  Get the remote_arch type.
1221 ********************************************************************/
1222
1223 enum remote_arch_types get_remote_arch(void)
1224 {
1225         return ra_type;
1226 }
1227
1228 #define RA_CACHE_TTL 7*24*3600
1229
1230 static bool remote_arch_cache_key(const struct GUID *client_guid,
1231                                   fstring key)
1232 {
1233         struct GUID_txt_buf guid_buf;
1234         const char *guid_string = NULL;
1235
1236         guid_string = GUID_buf_string(client_guid, &guid_buf);
1237         if (guid_string == NULL) {
1238                 return false;
1239         }
1240
1241         fstr_sprintf(key, "RA/%s", guid_string);
1242         return true;
1243 }
1244
1245 struct ra_parser_state {
1246         bool found;
1247         enum remote_arch_types ra;
1248 };
1249
1250 static void ra_parser(const struct gencache_timeout *t,
1251                       DATA_BLOB blob,
1252                       void *priv_data)
1253 {
1254         struct ra_parser_state *state = (struct ra_parser_state *)priv_data;
1255         const char *ra_str = NULL;
1256
1257         if (gencache_timeout_expired(t)) {
1258                 return;
1259         }
1260
1261         if ((blob.length == 0) || (blob.data[blob.length-1] != '\0')) {
1262                 DBG_ERR("Remote arch cache key not a string\n");
1263                 return;
1264         }
1265
1266         ra_str = (const char *)blob.data;
1267         DBG_INFO("Got remote arch [%s] from cache\n", ra_str);
1268
1269         state->ra = get_remote_arch_from_str(ra_str);
1270         state->found = true;
1271         return;
1272 }
1273
1274 static bool remote_arch_cache_get(const struct GUID *client_guid)
1275 {
1276         bool ok;
1277         fstring ra_key;
1278         struct ra_parser_state state = (struct ra_parser_state) {
1279                 .found = false,
1280                 .ra = RA_UNKNOWN,
1281         };
1282
1283         ok = remote_arch_cache_key(client_guid, ra_key);
1284         if (!ok) {
1285                 return false;
1286         }
1287
1288         ok = gencache_parse(ra_key, ra_parser, &state);
1289         if (!ok || !state.found) {
1290                 return true;
1291         }
1292
1293         if (state.ra == RA_UNKNOWN) {
1294                 return true;
1295         }
1296
1297         set_remote_arch(state.ra);
1298         return true;
1299 }
1300
1301 static bool remote_arch_cache_set(const struct GUID *client_guid)
1302 {
1303         bool ok;
1304         fstring ra_key;
1305         const char *ra_str = NULL;
1306
1307         if (get_remote_arch() == RA_UNKNOWN) {
1308                 return true;
1309         }
1310
1311         ok = remote_arch_cache_key(client_guid, ra_key);
1312         if (!ok) {
1313                 return false;
1314         }
1315
1316         ra_str = get_remote_arch_str();
1317         if (ra_str == NULL) {
1318                 return false;
1319         }
1320
1321         ok = gencache_set(ra_key, ra_str, time(NULL) + RA_CACHE_TTL);
1322         if (!ok) {
1323                 return false;
1324         }
1325
1326         return true;
1327 }
1328
1329 bool remote_arch_cache_update(const struct GUID *client_guid)
1330 {
1331         bool ok;
1332
1333         if (get_remote_arch() == RA_UNKNOWN) {
1334
1335                 become_root();
1336                 ok = remote_arch_cache_get(client_guid);
1337                 unbecome_root();
1338
1339                 return ok;
1340         }
1341
1342         become_root();
1343         ok = remote_arch_cache_set(client_guid);
1344         unbecome_root();
1345
1346         return ok;
1347 }
1348
1349 bool remote_arch_cache_delete(const struct GUID *client_guid)
1350 {
1351         bool ok;
1352         fstring ra_key;
1353
1354         ok = remote_arch_cache_key(client_guid, ra_key);
1355         if (!ok) {
1356                 return false;
1357         }
1358
1359         become_root();
1360         ok = gencache_del(ra_key);
1361         unbecome_root();
1362
1363         if (!ok) {
1364                 return false;
1365         }
1366
1367         return true;
1368 }
1369
1370 const char *tab_depth(int level, int depth)
1371 {
1372         if( CHECK_DEBUGLVL(level) ) {
1373                 dbgtext("%*s", depth*4, "");
1374         }
1375         return "";
1376 }
1377
1378 /*****************************************************************************
1379  Provide a checksum on a string
1380
1381  Input:  s - the null-terminated character string for which the checksum
1382              will be calculated.
1383
1384   Output: The checksum value calculated for s.
1385 *****************************************************************************/
1386
1387 int str_checksum(const char *s)
1388 {
1389         TDB_DATA key;
1390         if (s == NULL)
1391                 return 0;
1392
1393         key = (TDB_DATA) { .dptr = discard_const_p(uint8_t, s),
1394                            .dsize = strlen(s) };
1395
1396         return tdb_jenkins_hash(&key);
1397 }
1398
1399 /*****************************************************************
1400  Zero a memory area then free it. Used to catch bugs faster.
1401 *****************************************************************/
1402
1403 void zero_free(void *p, size_t size)
1404 {
1405         memset(p, 0, size);
1406         SAFE_FREE(p);
1407 }
1408
1409 /*****************************************************************
1410  Set our open file limit to a requested max and return the limit.
1411 *****************************************************************/
1412
1413 int set_maxfiles(int requested_max)
1414 {
1415 #if (defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE))
1416         struct rlimit rlp;
1417         int saved_current_limit;
1418
1419         if(getrlimit(RLIMIT_NOFILE, &rlp)) {
1420                 DEBUG(0,("set_maxfiles: getrlimit (1) for RLIMIT_NOFILE failed with error %s\n",
1421                         strerror(errno) ));
1422                 /* just guess... */
1423                 return requested_max;
1424         }
1425
1426         /*
1427          * Set the fd limit to be real_max_open_files + MAX_OPEN_FUDGEFACTOR to
1428          * account for the extra fd we need
1429          * as well as the log files and standard
1430          * handles etc. Save the limit we want to set in case
1431          * we are running on an OS that doesn't support this limit (AIX)
1432          * which always returns RLIM_INFINITY for rlp.rlim_max.
1433          */
1434
1435         /* Try raising the hard (max) limit to the requested amount. */
1436
1437 #if defined(RLIM_INFINITY)
1438         if (rlp.rlim_max != RLIM_INFINITY) {
1439                 int orig_max = rlp.rlim_max;
1440
1441                 if ( rlp.rlim_max < requested_max )
1442                         rlp.rlim_max = requested_max;
1443
1444                 /* This failing is not an error - many systems (Linux) don't
1445                         support our default request of 10,000 open files. JRA. */
1446
1447                 if(setrlimit(RLIMIT_NOFILE, &rlp)) {
1448                         DEBUG(3,("set_maxfiles: setrlimit for RLIMIT_NOFILE for %d max files failed with error %s\n",
1449                                 (int)rlp.rlim_max, strerror(errno) ));
1450
1451                         /* Set failed - restore original value from get. */
1452                         rlp.rlim_max = orig_max;
1453                 }
1454         }
1455 #endif
1456
1457         /* Now try setting the soft (current) limit. */
1458
1459         saved_current_limit = rlp.rlim_cur = MIN(requested_max,rlp.rlim_max);
1460
1461         if(setrlimit(RLIMIT_NOFILE, &rlp)) {
1462                 DEBUG(0,("set_maxfiles: setrlimit for RLIMIT_NOFILE for %d files failed with error %s\n",
1463                         (int)rlp.rlim_cur, strerror(errno) ));
1464                 /* just guess... */
1465                 return saved_current_limit;
1466         }
1467
1468         if(getrlimit(RLIMIT_NOFILE, &rlp)) {
1469                 DEBUG(0,("set_maxfiles: getrlimit (2) for RLIMIT_NOFILE failed with error %s\n",
1470                         strerror(errno) ));
1471                 /* just guess... */
1472                 return saved_current_limit;
1473     }
1474
1475 #if defined(RLIM_INFINITY)
1476         if(rlp.rlim_cur == RLIM_INFINITY)
1477                 return saved_current_limit;
1478 #endif
1479
1480         if((int)rlp.rlim_cur > saved_current_limit)
1481                 return saved_current_limit;
1482
1483         return rlp.rlim_cur;
1484 #else /* !defined(HAVE_GETRLIMIT) || !defined(RLIMIT_NOFILE) */
1485         /*
1486          * No way to know - just guess...
1487          */
1488         return requested_max;
1489 #endif
1490 }
1491
1492 /*****************************************************************
1493  malloc that aborts with smb_panic on fail or zero size.
1494  *****************************************************************/
1495
1496 void *smb_xmalloc_array(size_t size, unsigned int count)
1497 {
1498         void *p;
1499         if (size == 0) {
1500                 smb_panic("smb_xmalloc_array: called with zero size");
1501         }
1502         if (count >= MAX_ALLOC_SIZE/size) {
1503                 smb_panic("smb_xmalloc_array: alloc size too large");
1504         }
1505         if ((p = SMB_MALLOC(size*count)) == NULL) {
1506                 DEBUG(0, ("smb_xmalloc_array failed to allocate %lu * %lu bytes\n",
1507                         (unsigned long)size, (unsigned long)count));
1508                 smb_panic("smb_xmalloc_array: malloc failed");
1509         }
1510         return p;
1511 }
1512
1513 /*
1514   vasprintf that aborts on malloc fail
1515 */
1516
1517  int smb_xvasprintf(char **ptr, const char *format, va_list ap)
1518 {
1519         int n;
1520         va_list ap2;
1521
1522         va_copy(ap2, ap);
1523
1524         n = vasprintf(ptr, format, ap2);
1525         va_end(ap2);
1526         if (n == -1 || ! *ptr) {
1527                 smb_panic("smb_xvasprintf: out of memory");
1528         }
1529         return n;
1530 }
1531
1532 /*****************************************************************
1533  Get local hostname and cache result.
1534 *****************************************************************/
1535
1536 char *myhostname(void)
1537 {
1538         static char *ret;
1539         if (ret == NULL) {
1540                 ret = get_myname(NULL);
1541         }
1542         return ret;
1543 }
1544
1545 /*****************************************************************
1546  Get local hostname and cache result.
1547 *****************************************************************/
1548
1549 char *myhostname_upper(void)
1550 {
1551         static char *ret;
1552         if (ret == NULL) {
1553                 char *name = get_myname(NULL);
1554                 if (name == NULL) {
1555                         return NULL;
1556                 }
1557                 ret = strupper_talloc(NULL, name);
1558                 talloc_free(name);
1559         }
1560         return ret;
1561 }
1562
1563 /*******************************************************************
1564  Given a filename - get its directory name
1565 ********************************************************************/
1566
1567 bool parent_dirname(TALLOC_CTX *mem_ctx, const char *dir, char **parent,
1568                     const char **name)
1569 {
1570         char *p;
1571         ptrdiff_t len;
1572
1573         p = strrchr_m(dir, '/'); /* Find final '/', if any */
1574
1575         if (p == NULL) {
1576                 if (!(*parent = talloc_strdup(mem_ctx, "."))) {
1577                         return False;
1578                 }
1579                 if (name) {
1580                         *name = dir;
1581                 }
1582                 return True;
1583         }
1584
1585         len = p-dir;
1586
1587         if (!(*parent = (char *)talloc_memdup(mem_ctx, dir, len+1))) {
1588                 return False;
1589         }
1590         (*parent)[len] = '\0';
1591
1592         if (name) {
1593                 *name = p+1;
1594         }
1595         return True;
1596 }
1597
1598 /*******************************************************************
1599  Determine if a pattern contains any Microsoft wildcard characters.
1600 *******************************************************************/
1601
1602 bool ms_has_wild(const char *s)
1603 {
1604         char c;
1605
1606         while ((c = *s++)) {
1607                 switch (c) {
1608                 case '*':
1609                 case '?':
1610                 case '<':
1611                 case '>':
1612                 case '"':
1613                         return True;
1614                 }
1615         }
1616         return False;
1617 }
1618
1619 bool ms_has_wild_w(const smb_ucs2_t *s)
1620 {
1621         smb_ucs2_t c;
1622         if (!s) return False;
1623         while ((c = *s++)) {
1624                 switch (c) {
1625                 case UCS2_CHAR('*'):
1626                 case UCS2_CHAR('?'):
1627                 case UCS2_CHAR('<'):
1628                 case UCS2_CHAR('>'):
1629                 case UCS2_CHAR('"'):
1630                         return True;
1631                 }
1632         }
1633         return False;
1634 }
1635
1636 /*******************************************************************
1637  A wrapper that handles case sensitivity and the special handling
1638  of the ".." name.
1639 *******************************************************************/
1640
1641 bool mask_match(const char *string, const char *pattern, bool is_case_sensitive)
1642 {
1643         if (ISDOTDOT(string))
1644                 string = ".";
1645         if (ISDOT(pattern))
1646                 return False;
1647
1648         return ms_fnmatch_protocol(pattern, string, Protocol, is_case_sensitive) == 0;
1649 }
1650
1651 /*******************************************************************
1652  A wrapper that handles case sensitivity and the special handling
1653  of the ".." name. Varient that is only called by old search code which requires
1654  pattern translation.
1655 *******************************************************************/
1656
1657 bool mask_match_search(const char *string, const char *pattern, bool is_case_sensitive)
1658 {
1659         if (ISDOTDOT(string))
1660                 string = ".";
1661         if (ISDOT(pattern))
1662                 return False;
1663
1664         return ms_fnmatch(pattern, string, True, is_case_sensitive) == 0;
1665 }
1666
1667 /*******************************************************************
1668  A wrapper that handles a list of patters and calls mask_match()
1669  on each.  Returns True if any of the patterns match.
1670 *******************************************************************/
1671
1672 bool mask_match_list(const char *string, char **list, int listLen, bool is_case_sensitive)
1673 {
1674        while (listLen-- > 0) {
1675                if (mask_match(string, *list++, is_case_sensitive))
1676                        return True;
1677        }
1678        return False;
1679 }
1680
1681 /**********************************************************************
1682   Converts a name to a fully qualified domain name.
1683   Returns true if lookup succeeded, false if not (then fqdn is set to name)
1684   Uses getaddrinfo() with AI_CANONNAME flag to obtain the official
1685   canonical name of the host. getaddrinfo() may use a variety of sources
1686   including /etc/hosts to obtain the domainname. It expects aliases in
1687   /etc/hosts to NOT be the FQDN. The FQDN should come first.
1688 ************************************************************************/
1689
1690 bool name_to_fqdn(fstring fqdn, const char *name)
1691 {
1692         char *full = NULL;
1693         struct addrinfo hints;
1694         struct addrinfo *result;
1695         int s;
1696
1697         /* Configure hints to obtain canonical name */
1698
1699         memset(&hints, 0, sizeof(struct addrinfo));
1700         hints.ai_family = AF_UNSPEC;    /* Allow IPv4 or IPv6 */
1701         hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
1702         hints.ai_flags = AI_CANONNAME;  /* Get host's FQDN */
1703         hints.ai_protocol = 0;          /* Any protocol */
1704
1705         s = getaddrinfo(name, NULL, &hints, &result);
1706         if (s != 0) {
1707                 DEBUG(1, ("getaddrinfo: %s\n", gai_strerror(s)));
1708                 DEBUG(10,("name_to_fqdn: lookup for %s failed.\n", name));
1709                 fstrcpy(fqdn, name);
1710                 return false;
1711         }
1712         full = result->ai_canonname;
1713
1714         /* Find out if the FQDN is returned as an alias
1715          * to cope with /etc/hosts files where the first
1716          * name is not the FQDN but the short name.
1717          * getaddrinfo provides no easy way of handling aliases
1718          * in /etc/hosts. Users should make sure the FQDN
1719          * comes first in /etc/hosts. */
1720         if (full && (! strchr_m(full, '.'))) {
1721                 DEBUG(1, ("WARNING: your /etc/hosts file may be broken!\n"));
1722                 DEBUGADD(1, ("    Full qualified domain names (FQDNs) should not be specified\n"));
1723                 DEBUGADD(1, ("    as an alias in /etc/hosts. FQDN should be the first name\n"));
1724                 DEBUGADD(1, ("    prior to any aliases.\n"));
1725         }
1726         if (full && (strcasecmp_m(full, "localhost.localdomain") == 0)) {
1727                 DEBUG(1, ("WARNING: your /etc/hosts file may be broken!\n"));
1728                 DEBUGADD(1, ("    Specifying the machine hostname for address 127.0.0.1 may lead\n"));
1729                 DEBUGADD(1, ("    to Kerberos authentication problems as localhost.localdomain\n"));
1730                 DEBUGADD(1, ("    may end up being used instead of the real machine FQDN.\n"));
1731         }
1732
1733         DEBUG(10,("name_to_fqdn: lookup for %s -> %s.\n", name, full));
1734         fstrcpy(fqdn, full);
1735         freeaddrinfo(result);           /* No longer needed */
1736         return true;
1737 }
1738
1739 uint32_t map_share_mode_to_deny_mode(uint32_t share_access, uint32_t private_options)
1740 {
1741         switch (share_access & ~FILE_SHARE_DELETE) {
1742                 case FILE_SHARE_NONE:
1743                         return DENY_ALL;
1744                 case FILE_SHARE_READ:
1745                         return DENY_WRITE;
1746                 case FILE_SHARE_WRITE:
1747                         return DENY_READ;
1748                 case FILE_SHARE_READ|FILE_SHARE_WRITE:
1749                         return DENY_NONE;
1750         }
1751         if (private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_DOS) {
1752                 return DENY_DOS;
1753         } else if (private_options & NTCREATEX_OPTIONS_PRIVATE_DENY_FCB) {
1754                 return DENY_FCB;
1755         }
1756
1757         return (uint32_t)-1;
1758 }
1759
1760 struct server_id interpret_pid(const char *pid_string)
1761 {
1762         return server_id_from_string(get_my_vnn(), pid_string);
1763 }
1764
1765 /****************************************************************
1766  Check if an offset into a buffer is safe.
1767  If this returns True it's safe to indirect into the byte at
1768  pointer ptr+off.
1769 ****************************************************************/
1770
1771 bool is_offset_safe(const char *buf_base, size_t buf_len, char *ptr, size_t off)
1772 {
1773         const char *end_base = buf_base + buf_len;
1774         char *end_ptr = ptr + off;
1775
1776         if (!buf_base || !ptr) {
1777                 return False;
1778         }
1779
1780         if (end_base < buf_base || end_ptr < ptr) {
1781                 return False; /* wrap. */
1782         }
1783
1784         if (end_ptr < end_base) {
1785                 return True;
1786         }
1787         return False;
1788 }
1789
1790 /****************************************************************
1791  Return a safe pointer into a buffer, or NULL.
1792 ****************************************************************/
1793
1794 char *get_safe_ptr(const char *buf_base, size_t buf_len, char *ptr, size_t off)
1795 {
1796         return is_offset_safe(buf_base, buf_len, ptr, off) ?
1797                         ptr + off : NULL;
1798 }
1799
1800 /****************************************************************
1801  Return a safe pointer into a string within a buffer, or NULL.
1802 ****************************************************************/
1803
1804 char *get_safe_str_ptr(const char *buf_base, size_t buf_len, char *ptr, size_t off)
1805 {
1806         if (!is_offset_safe(buf_base, buf_len, ptr, off)) {
1807                 return NULL;
1808         }
1809         /* Check if a valid string exists at this offset. */
1810         if (skip_string(buf_base,buf_len, ptr + off) == NULL) {
1811                 return NULL;
1812         }
1813         return ptr + off;
1814 }
1815
1816 /****************************************************************
1817  Return an SVAL at a pointer, or failval if beyond the end.
1818 ****************************************************************/
1819
1820 int get_safe_SVAL(const char *buf_base, size_t buf_len, char *ptr, size_t off, int failval)
1821 {
1822         /*
1823          * Note we use off+1 here, not off+2 as SVAL accesses ptr[0] and ptr[1],
1824          * NOT ptr[2].
1825          */
1826         if (!is_offset_safe(buf_base, buf_len, ptr, off+1)) {
1827                 return failval;
1828         }
1829         return SVAL(ptr,off);
1830 }
1831
1832 /****************************************************************
1833  Return an IVAL at a pointer, or failval if beyond the end.
1834 ****************************************************************/
1835
1836 int get_safe_IVAL(const char *buf_base, size_t buf_len, char *ptr, size_t off, int failval)
1837 {
1838         /*
1839          * Note we use off+3 here, not off+4 as IVAL accesses
1840          * ptr[0] ptr[1] ptr[2] ptr[3] NOT ptr[4].
1841          */
1842         if (!is_offset_safe(buf_base, buf_len, ptr, off+3)) {
1843                 return failval;
1844         }
1845         return IVAL(ptr,off);
1846 }
1847
1848 /****************************************************************
1849  Split DOM\user into DOM and user. Do not mix with winbind variants of that
1850  call (they take care of winbind separator and other winbind specific settings).
1851 ****************************************************************/
1852
1853 bool split_domain_user(TALLOC_CTX *mem_ctx,
1854                        const char *full_name,
1855                        char **domain,
1856                        char **user)
1857 {
1858         const char *p = NULL;
1859
1860         p = strchr_m(full_name, '\\');
1861
1862         if (p != NULL) {
1863                 *domain = talloc_strndup(mem_ctx, full_name,
1864                                          PTR_DIFF(p, full_name));
1865                 if (*domain == NULL) {
1866                         return false;
1867                 }
1868                 *user = talloc_strdup(mem_ctx, p+1);
1869                 if (*user == NULL) {
1870                         TALLOC_FREE(*domain);
1871                         return false;
1872                 }
1873         } else {
1874                 *domain = NULL;
1875                 *user = talloc_strdup(mem_ctx, full_name);
1876                 if (*user == NULL) {
1877                         return false;
1878                 }
1879         }
1880
1881         return true;
1882 }
1883
1884 /****************************************************************
1885  strip off leading '\\' from a hostname
1886 ****************************************************************/
1887
1888 const char *strip_hostname(const char *s)
1889 {
1890         if (!s) {
1891                 return NULL;
1892         }
1893
1894         if (strlen_m(s) < 3) {
1895                 return s;
1896         }
1897
1898         if (s[0] == '\\') s++;
1899         if (s[0] == '\\') s++;
1900
1901         return s;
1902 }
1903
1904 bool any_nt_status_not_ok(NTSTATUS err1, NTSTATUS err2, NTSTATUS *result)
1905 {
1906         if (!NT_STATUS_IS_OK(err1)) {
1907                 *result = err1;
1908                 return true;
1909         }
1910         if (!NT_STATUS_IS_OK(err2)) {
1911                 *result = err2;
1912                 return true;
1913         }
1914         return false;
1915 }
1916
1917 int timeval_to_msec(struct timeval t)
1918 {
1919         return t.tv_sec * 1000 + (t.tv_usec+999) / 1000;
1920 }
1921
1922 /*******************************************************************
1923  Check a given DOS pathname is valid for a share.
1924 ********************************************************************/
1925
1926 char *valid_share_pathname(TALLOC_CTX *ctx, const char *dos_pathname)
1927 {
1928         char *ptr = NULL;
1929
1930         if (!dos_pathname) {
1931                 return NULL;
1932         }
1933
1934         ptr = talloc_strdup(ctx, dos_pathname);
1935         if (!ptr) {
1936                 return NULL;
1937         }
1938         /* Convert any '\' paths to '/' */
1939         unix_format(ptr);
1940         ptr = unix_clean_name(ctx, ptr);
1941         if (!ptr) {
1942                 return NULL;
1943         }
1944
1945         /* NT is braindead - it wants a C: prefix to a pathname ! So strip it. */
1946         if (strlen(ptr) > 2 && ptr[1] == ':' && ptr[0] != '/')
1947                 ptr += 2;
1948
1949         /* Only absolute paths allowed. */
1950         if (*ptr != '/')
1951                 return NULL;
1952
1953         return ptr;
1954 }
1955
1956 /*******************************************************************
1957  Return True if the filename is one of the special executable types.
1958 ********************************************************************/
1959
1960 bool is_executable(const char *fname)
1961 {
1962         if ((fname = strrchr_m(fname,'.'))) {
1963                 if (strequal(fname,".com") ||
1964                     strequal(fname,".dll") ||
1965                     strequal(fname,".exe") ||
1966                     strequal(fname,".sym")) {
1967                         return True;
1968                 }
1969         }
1970         return False;
1971 }
1972
1973 /****************************************************************************
1974  Open a file with a share mode - old openX method - map into NTCreate.
1975 ****************************************************************************/
1976
1977 bool map_open_params_to_ntcreate(const char *smb_base_fname,
1978                                  int deny_mode, int open_func,
1979                                  uint32_t *paccess_mask,
1980                                  uint32_t *pshare_mode,
1981                                  uint32_t *pcreate_disposition,
1982                                  uint32_t *pcreate_options,
1983                                  uint32_t *pprivate_flags)
1984 {
1985         uint32_t access_mask;
1986         uint32_t share_mode;
1987         uint32_t create_disposition;
1988         uint32_t create_options = FILE_NON_DIRECTORY_FILE;
1989         uint32_t private_flags = 0;
1990
1991         DEBUG(10,("map_open_params_to_ntcreate: fname = %s, deny_mode = 0x%x, "
1992                   "open_func = 0x%x\n",
1993                   smb_base_fname, (unsigned int)deny_mode,
1994                   (unsigned int)open_func ));
1995
1996         /* Create the NT compatible access_mask. */
1997         switch (GET_OPENX_MODE(deny_mode)) {
1998                 case DOS_OPEN_EXEC: /* Implies read-only - used to be FILE_READ_DATA */
1999                 case DOS_OPEN_RDONLY:
2000                         access_mask = FILE_GENERIC_READ;
2001                         break;
2002                 case DOS_OPEN_WRONLY:
2003                         access_mask = FILE_GENERIC_WRITE;
2004                         break;
2005                 case DOS_OPEN_RDWR:
2006                 case DOS_OPEN_FCB:
2007                         access_mask = FILE_GENERIC_READ|FILE_GENERIC_WRITE;
2008                         break;
2009                 default:
2010                         DEBUG(10,("map_open_params_to_ntcreate: bad open mode = 0x%x\n",
2011                                   (unsigned int)GET_OPENX_MODE(deny_mode)));
2012                         return False;
2013         }
2014
2015         /* Create the NT compatible create_disposition. */
2016         switch (open_func) {
2017                 case OPENX_FILE_EXISTS_FAIL|OPENX_FILE_CREATE_IF_NOT_EXIST:
2018                         create_disposition = FILE_CREATE;
2019                         break;
2020
2021                 case OPENX_FILE_EXISTS_OPEN:
2022                         create_disposition = FILE_OPEN;
2023                         break;
2024
2025                 case OPENX_FILE_EXISTS_OPEN|OPENX_FILE_CREATE_IF_NOT_EXIST:
2026                         create_disposition = FILE_OPEN_IF;
2027                         break;
2028
2029                 case OPENX_FILE_EXISTS_TRUNCATE:
2030                         create_disposition = FILE_OVERWRITE;
2031                         break;
2032
2033                 case OPENX_FILE_EXISTS_TRUNCATE|OPENX_FILE_CREATE_IF_NOT_EXIST:
2034                         create_disposition = FILE_OVERWRITE_IF;
2035                         break;
2036
2037                 default:
2038                         /* From samba4 - to be confirmed. */
2039                         if (GET_OPENX_MODE(deny_mode) == DOS_OPEN_EXEC) {
2040                                 create_disposition = FILE_CREATE;
2041                                 break;
2042                         }
2043                         DEBUG(10,("map_open_params_to_ntcreate: bad "
2044                                   "open_func 0x%x\n", (unsigned int)open_func));
2045                         return False;
2046         }
2047
2048         /* Create the NT compatible share modes. */
2049         switch (GET_DENY_MODE(deny_mode)) {
2050                 case DENY_ALL:
2051                         share_mode = FILE_SHARE_NONE;
2052                         break;
2053
2054                 case DENY_WRITE:
2055                         share_mode = FILE_SHARE_READ;
2056                         break;
2057
2058                 case DENY_READ:
2059                         share_mode = FILE_SHARE_WRITE;
2060                         break;
2061
2062                 case DENY_NONE:
2063                         share_mode = FILE_SHARE_READ|FILE_SHARE_WRITE;
2064                         break;
2065
2066                 case DENY_DOS:
2067                         private_flags |= NTCREATEX_OPTIONS_PRIVATE_DENY_DOS;
2068                         if (is_executable(smb_base_fname)) {
2069                                 share_mode = FILE_SHARE_READ|FILE_SHARE_WRITE;
2070                         } else {
2071                                 if (GET_OPENX_MODE(deny_mode) == DOS_OPEN_RDONLY) {
2072                                         share_mode = FILE_SHARE_READ;
2073                                 } else {
2074                                         share_mode = FILE_SHARE_NONE;
2075                                 }
2076                         }
2077                         break;
2078
2079                 case DENY_FCB:
2080                         private_flags |= NTCREATEX_OPTIONS_PRIVATE_DENY_FCB;
2081                         share_mode = FILE_SHARE_NONE;
2082                         break;
2083
2084                 default:
2085                         DEBUG(10,("map_open_params_to_ntcreate: bad deny_mode 0x%x\n",
2086                                 (unsigned int)GET_DENY_MODE(deny_mode) ));
2087                         return False;
2088         }
2089
2090         DEBUG(10,("map_open_params_to_ntcreate: file %s, access_mask = 0x%x, "
2091                   "share_mode = 0x%x, create_disposition = 0x%x, "
2092                   "create_options = 0x%x private_flags = 0x%x\n",
2093                   smb_base_fname,
2094                   (unsigned int)access_mask,
2095                   (unsigned int)share_mode,
2096                   (unsigned int)create_disposition,
2097                   (unsigned int)create_options,
2098                   (unsigned int)private_flags));
2099
2100         if (paccess_mask) {
2101                 *paccess_mask = access_mask;
2102         }
2103         if (pshare_mode) {
2104                 *pshare_mode = share_mode;
2105         }
2106         if (pcreate_disposition) {
2107                 *pcreate_disposition = create_disposition;
2108         }
2109         if (pcreate_options) {
2110                 *pcreate_options = create_options;
2111         }
2112         if (pprivate_flags) {
2113                 *pprivate_flags = private_flags;
2114         }
2115
2116         return True;
2117
2118 }
2119
2120 /*************************************************************************
2121  Return a talloced copy of a struct security_unix_token. NULL on fail.
2122 *************************************************************************/
2123
2124 struct security_unix_token *copy_unix_token(TALLOC_CTX *ctx, const struct security_unix_token *tok)
2125 {
2126         struct security_unix_token *cpy;
2127
2128         cpy = talloc(ctx, struct security_unix_token);
2129         if (!cpy) {
2130                 return NULL;
2131         }
2132
2133         cpy->uid = tok->uid;
2134         cpy->gid = tok->gid;
2135         cpy->ngroups = tok->ngroups;
2136         if (tok->ngroups) {
2137                 /* Make this a talloc child of cpy. */
2138                 cpy->groups = (gid_t *)talloc_memdup(
2139                         cpy, tok->groups, tok->ngroups * sizeof(gid_t));
2140                 if (!cpy->groups) {
2141                         TALLOC_FREE(cpy);
2142                         return NULL;
2143                 }
2144         } else {
2145                 cpy->groups = NULL;
2146         }
2147         return cpy;
2148 }
2149
2150 /****************************************************************************
2151  Return a root token
2152 ****************************************************************************/
2153
2154 struct security_unix_token *root_unix_token(TALLOC_CTX *mem_ctx)
2155 {
2156         struct security_unix_token *t = NULL;
2157
2158         t = talloc_zero(mem_ctx, struct security_unix_token);
2159         if (t == NULL) {
2160                 return NULL;
2161         }
2162
2163         /*
2164          * This is not needed, but lets make it explicit, not implicit.
2165          */
2166         *t = (struct security_unix_token) {
2167                 .uid = 0,
2168                 .gid = 0,
2169                 .ngroups = 0,
2170                 .groups = NULL
2171         };
2172
2173         return t;
2174 }
2175
2176 /****************************************************************************
2177  Check that a file matches a particular file type.
2178 ****************************************************************************/
2179
2180 bool dir_check_ftype(uint32_t mode, uint32_t dirtype)
2181 {
2182         uint32_t mask;
2183
2184         /* Check the "may have" search bits. */
2185         if (((mode & ~dirtype) &
2186                         (FILE_ATTRIBUTE_HIDDEN |
2187                          FILE_ATTRIBUTE_SYSTEM |
2188                          FILE_ATTRIBUTE_DIRECTORY)) != 0) {
2189                 return false;
2190         }
2191
2192         /* Check the "must have" bits,
2193            which are the may have bits shifted eight */
2194         /* If must have bit is set, the file/dir can
2195            not be returned in search unless the matching
2196            file attribute is set */
2197         mask = ((dirtype >> 8) & (FILE_ATTRIBUTE_DIRECTORY|
2198                                     FILE_ATTRIBUTE_ARCHIVE|
2199                                    FILE_ATTRIBUTE_READONLY|
2200                                      FILE_ATTRIBUTE_HIDDEN|
2201                                      FILE_ATTRIBUTE_SYSTEM)); /* & 0x37 */
2202         if(mask) {
2203                 if((mask & (mode & (FILE_ATTRIBUTE_DIRECTORY|
2204                                       FILE_ATTRIBUTE_ARCHIVE|
2205                                      FILE_ATTRIBUTE_READONLY|
2206                                        FILE_ATTRIBUTE_HIDDEN|
2207                                         FILE_ATTRIBUTE_SYSTEM))) == mask) {
2208                         /* check if matching attribute present */
2209                         return true;
2210                 } else {
2211                         return false;
2212                 }
2213         }
2214
2215         return true;
2216 }