examples/libsmbclient/smbwrapper/smbw_stat.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 2.0
   4    SMB wrapper stat functions
   5    Copyright (C) Andrew Tridgell 1998
   6    Copyright (C) Derrell Lipman 2003-2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "smbw.h"
  24
  25 static int timezone_diff = -1;
  26
  27 #define TM_YEAR_BASE 1900
  28
  29 /*******************************************************************
  30 yield the difference between *A and *B, in seconds, ignoring leap seconds
  31 ********************************************************************/
  32 static int tm_diff(struct tm *a, struct tm *b)
  33 {
  34   int ay = a->tm_year + (TM_YEAR_BASE - 1);
  35   int by = b->tm_year + (TM_YEAR_BASE - 1);
  36   int intervening_leap_days =
  37     (ay/4 - by/4) - (ay/100 - by/100) + (ay/400 - by/400);
  38   int years = ay - by;
  39   int days = 365*years + intervening_leap_days + (a->tm_yday - b->tm_yday);
  40   int hours = 24*days + (a->tm_hour - b->tm_hour);
  41   int minutes = 60*hours + (a->tm_min - b->tm_min);
  42   int seconds = 60*minutes + (a->tm_sec - b->tm_sec);
  43
  44   return seconds;
  45 }
  46
  47 /*******************************************************************
  48   return the UTC offset in seconds west of UTC, or 0 if it cannot be determined
  49   ******************************************************************/
  50 static int TimeZone(time_t t)
  51 {
  52   struct tm *tm = gmtime(&t);
  53   struct tm tm_utc;
  54   if (!tm)
  55     return 0;
  56   tm_utc = *tm;
  57   tm = localtime(&t);
  58   if (!tm)
  59     return 0;
  60   return tm_diff(&tm_utc,tm);
  61
  62 }
  63
  64
  65 static void copy_stat(struct SMBW_stat *external, struct stat *internal)
  66 {
  67         if (timezone_diff < 0)
  68         {
  69             timezone_diff = TimeZone(time(NULL));
  70         }
  71
  72         external->s_dev = internal->st_dev;
  73         external->s_ino = internal->st_ino;
  74         external->s_mode = internal->st_mode;
  75         external->s_nlink = internal->st_nlink;
  76         external->s_uid = internal->st_uid;
  77         external->s_gid = internal->st_gid;
  78         external->s_rdev = internal->st_rdev;
  79         external->s_size = internal->st_size;
  80         external->s_blksize = internal->st_blksize;
  81         external->s_blocks = internal->st_blocks;
  82         external->s_atime = internal->st_atime + timezone_diff;
  83         external->s_mtime = internal->st_mtime + timezone_diff;
  84         external->s_ctime = internal->st_ctime + timezone_diff;
  85 }
  86
  87
  88 /*****************************************************
  89 a wrapper for fstat()
  90 *******************************************************/
  91 int smbw_fstat(int fd_smbw, struct SMBW_stat *st)
  92 {
  93         int fd_client = smbw_fd_map[fd_smbw];
  94         struct stat statbuf;
  95
  96         if (smbc_fstat(fd_client, &statbuf) < 0) {
  97                 return -1;
  98         }
  99
 100         copy_stat(st, &statbuf);
 101
 102         return 0;
 103 }
 104
 105
 106 /*****************************************************
 107 a wrapper for stat()
 108 *******************************************************/
 109 int smbw_stat(const char *fname, struct SMBW_stat *st)
 110 {
 111         int simulate;
 112         char *p;
 113         char path[PATH_MAX];
 114         struct stat statbuf;
 115
 116         SMBW_INIT();
 117
 118         smbw_fix_path(fname, path);
 119
 120         p = path + 6;           /* look just past smb:// */
 121         simulate = (strchr(p, '/') == NULL);
 122
 123         /* special case for full-network scan, workgroups, and servers */
 124         if (simulate) {
 125             statbuf.st_dev = 0;
 126             statbuf.st_ino = 0;
 127             statbuf.st_mode = 0040777;
 128             statbuf.st_nlink = 1;
 129             statbuf.st_uid = 0;
 130             statbuf.st_gid = 0;
 131             statbuf.st_rdev = 0;
 132             statbuf.st_size = 0;
 133             statbuf.st_blksize = 1024;
 134             statbuf.st_blocks = 1;
 135             statbuf.st_atime = 0; /* beginning of epoch */
 136             statbuf.st_mtime = 0; /* beginning of epoch */
 137             statbuf.st_ctime = 0; /* beginning of epoch */
 138
 139         } else if (smbc_stat(path, &statbuf) < 0) {
 140                 return -1;
 141         }
 142
 143         copy_stat(st, &statbuf);
 144
 145         return 0;
 146 }