xapian-applications/omega/tmpdir.cc

   1 /** @file
   2  * @brief create a temporary directory securely
   3  */
   4 /* Copyright (C) 2007,2011,2016 Olly Betts
   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 2 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <config.h>
  22
  23 #include "tmpdir.h"
  24
  25 #include "safesysstat.h"
  26 #include "safeunistd.h"
  27 #include <sys/types.h>
  28 #include <stdlib.h> // Not cstdlib as we want mkdtemp.
  29 #include <cstring>
  30 #include <string>
  31
  32 #ifndef HAVE_MKDTEMP
  33 #include "portability/mkdtemp.h"
  34 #endif
  35
  36 #include "stringutils.h"
  37
  38 using namespace std;
  39
  40 static string tmpdir;
  41
  42 #define TMPDIR_LEAF "/omindex-XXXXXX"
  43
  44 const string &
  45 get_tmpdir()
  46 {
  47     if (tmpdir.empty()) {
  48         const char * p = getenv("TMPDIR");
  49         if (!p) p = "/tmp";
  50         size_t plen = strlen(p);
  51         size_t leaflen = CONST_STRLEN(TMPDIR_LEAF);
  52         char * dir_template = new char[plen + leaflen + 1];
  53         memcpy(dir_template, p, plen);
  54         memcpy(dir_template + plen, TMPDIR_LEAF, leaflen + 1);
  55         p = mkdtemp(dir_template);
  56         if (p) {
  57             dir_template[plen + leaflen] = '/';
  58             tmpdir.assign(dir_template, plen + leaflen + 1);
  59         }
  60         delete [] dir_template;
  61     }
  62     return tmpdir;
  63 }
  64
  65 void
  66 remove_tmpdir()
  67 {
  68     if (!tmpdir.empty())
  69         rmdir(tmpdir.c_str());
  70 }