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c22553effb
Otherwise, another user might recreate these files after the first deletion. Particularly with temporary directories, this could result in the removal of unintended files through symbol link attacks.
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/* Temporary file handling for tests.
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Copyright (C) 1998-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* This is required to get an mkstemp which can create large files on
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some 32-bit platforms. */
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#define _FILE_OFFSET_BITS 64
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#include <support/temp_file.h>
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#include <support/temp_file-internal.h>
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#include <support/support.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/* List of temporary files. */
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static struct temp_name_list
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{
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struct temp_name_list *next;
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char *name;
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pid_t owner;
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} *temp_name_list;
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/* Location of the temporary files. Set by the test skeleton via
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support_set_test_dir. The string is not be freed. */
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static const char *test_dir = _PATH_TMP;
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void
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add_temp_file (const char *name)
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{
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struct temp_name_list *newp
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= (struct temp_name_list *) xcalloc (sizeof (*newp), 1);
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char *newname = strdup (name);
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if (newname != NULL)
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{
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newp->name = newname;
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newp->next = temp_name_list;
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newp->owner = getpid ();
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temp_name_list = newp;
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}
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else
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free (newp);
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}
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int
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create_temp_file (const char *base, char **filename)
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{
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char *fname;
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int fd;
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fname = (char *) xmalloc (strlen (test_dir) + 1 + strlen (base)
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+ sizeof ("XXXXXX"));
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strcpy (stpcpy (stpcpy (stpcpy (fname, test_dir), "/"), base), "XXXXXX");
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fd = mkstemp (fname);
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if (fd == -1)
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{
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printf ("cannot open temporary file '%s': %m\n", fname);
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free (fname);
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return -1;
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}
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add_temp_file (fname);
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if (filename != NULL)
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*filename = fname;
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else
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free (fname);
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return fd;
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}
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/* Helper functions called by the test skeleton follow. */
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void
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support_set_test_dir (const char *path)
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{
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test_dir = path;
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}
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void
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support_delete_temp_files (void)
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{
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pid_t pid = getpid ();
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while (temp_name_list != NULL)
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{
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/* Only perform the removal if the path was registed in the same
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process, as identified by the PID. (This assumes that the
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parent process which registered the temporary file sticks
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around, to prevent PID reuse.) */
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if (temp_name_list->owner == pid)
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{
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if (remove (temp_name_list->name) != 0)
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printf ("warning: could not remove temporary file: %s: %m\n",
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temp_name_list->name);
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}
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free (temp_name_list->name);
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struct temp_name_list *next = temp_name_list->next;
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free (temp_name_list);
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temp_name_list = next;
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}
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}
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void
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support_print_temp_files (FILE *f)
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{
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if (temp_name_list != NULL)
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{
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struct temp_name_list *n;
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fprintf (f, "temp_files=(\n");
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for (n = temp_name_list; n != NULL; n = n->next)
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fprintf (f, " '%s'\n", n->name);
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fprintf (f, ")\n");
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}
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}
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