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-rw-r--r--lib/creat-safer.c33
-rw-r--r--lib/dup-safer.c46
-rw-r--r--lib/fcntl--.h28
-rw-r--r--lib/fcntl-safer.h24
-rw-r--r--lib/fd-safer.c59
-rw-r--r--lib/open-safer.c51
-rw-r--r--lib/pipe-safer.c50
-rw-r--r--lib/unistd--.h28
-rw-r--r--lib/unistd-safer.h23
9 files changed, 342 insertions, 0 deletions
diff --git a/lib/creat-safer.c b/lib/creat-safer.c
new file mode 100644
index 0000000..4588de3
--- /dev/null
+++ b/lib/creat-safer.c
@@ -0,0 +1,33 @@
1/* Invoke creat, but avoid some glitches.
2 Copyright (C) 2005 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
17
18/* Written by Jim Meyering. */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include "fcntl-safer.h"
25
26#include <fcntl.h>
27#include "unistd-safer.h"
28
29int
30creat_safer (char const *file, mode_t mode)
31{
32 return fd_safer (creat (file, mode));
33}
diff --git a/lib/dup-safer.c b/lib/dup-safer.c
new file mode 100644
index 0000000..8cbee70
--- /dev/null
+++ b/lib/dup-safer.c
@@ -0,0 +1,46 @@
1/* Invoke dup, but avoid some glitches.
2 Copyright (C) 2001, 2004, 2005 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
17
18/* Written by Paul Eggert. */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include "unistd-safer.h"
25
26#include <fcntl.h>
27
28#include <unistd.h>
29#ifndef STDERR_FILENO
30# define STDERR_FILENO 2
31#endif
32
33/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
34 STDERR_FILENO. */
35
36int
37dup_safer (int fd)
38{
39#ifdef F_DUPFD
40 return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
41#else
42 /* fd_safer calls us back, but eventually the recursion unwinds and
43 does the right thing. */
44 return fd_safer (dup (fd));
45#endif
46}
diff --git a/lib/fcntl--.h b/lib/fcntl--.h
new file mode 100644
index 0000000..51b869e
--- /dev/null
+++ b/lib/fcntl--.h
@@ -0,0 +1,28 @@
1/* Like fcntl.h, but redefine some names to avoid glitches.
2
3 Copyright (C) 2005 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19/* Written by Paul Eggert. */
20
21#include <fcntl.h>
22#include "fcntl-safer.h"
23
24#undef open
25#define open open_safer
26
27#undef creat
28#define creat creat_safer
diff --git a/lib/fcntl-safer.h b/lib/fcntl-safer.h
new file mode 100644
index 0000000..cab6aab
--- /dev/null
+++ b/lib/fcntl-safer.h
@@ -0,0 +1,24 @@
1/* Invoke fcntl-like functions, but avoid some glitches.
2
3 Copyright (C) 2005 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19/* Written by Paul Eggert. */
20
21#include <sys/types.h>
22
23int open_safer (char const *, int, ...);
24int creat_safer (char const *, mode_t);
diff --git a/lib/fd-safer.c b/lib/fd-safer.c
new file mode 100644
index 0000000..5933bcb
--- /dev/null
+++ b/lib/fd-safer.c
@@ -0,0 +1,59 @@
1/* Return a safer copy of a file descriptor.
2
3 Copyright (C) 2005 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19/* Written by Paul Eggert. */
20
21#ifdef HAVE_CONFIG_H
22# include <config.h>
23#endif
24
25#include "unistd-safer.h"
26
27#include <errno.h>
28
29#include <unistd.h>
30#ifndef STDIN_FILENO
31# define STDIN_FILENO 0
32#endif
33#ifndef STDERR_FILENO
34# define STDERR_FILENO 2
35#endif
36
37/* Return FD, unless FD would be a copy of standard input, output, or
38 error; in that case, return a duplicate of FD, closing FD. On
39 failure to duplicate, close FD, set errno, and return -1. Preserve
40 errno if FD is negative, so that the caller can always inspect
41 errno when the returned value is negative.
42
43 This function is usefully wrapped around functions that return file
44 descriptors, e.g., fd_safer (open ("file", O_RDONLY)). */
45
46int
47fd_safer (int fd)
48{
49 if (STDIN_FILENO <= fd && fd <= STDERR_FILENO)
50 {
51 int f = dup_safer (fd);
52 int e = errno;
53 close (fd);
54 errno = e;
55 fd = f;
56 }
57
58 return fd;
59}
diff --git a/lib/open-safer.c b/lib/open-safer.c
new file mode 100644
index 0000000..d3ba894
--- /dev/null
+++ b/lib/open-safer.c
@@ -0,0 +1,51 @@
1/* Invoke open, but avoid some glitches.
2 Copyright (C) 2005 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
17
18/* Written by Paul Eggert. */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include "fcntl-safer.h"
25
26#include <fcntl.h>
27#include <stdarg.h>
28#include "unistd-safer.h"
29
30int
31open_safer (char const *file, int flags, ...)
32{
33 mode_t mode = 0;
34
35 if (flags & O_CREAT)
36 {
37 va_list ap;
38 va_start (ap, flags);
39
40 /* Assume mode_t promotes to int if and only if it is smaller.
41 This assumption isn't guaranteed by the C standard, but we
42 don't know of any real-world counterexamples. */
43 mode = (sizeof (mode_t) < sizeof (int)
44 ? va_arg (ap, int)
45 : va_arg (ap, mode_t));
46
47 va_end (ap);
48 }
49
50 return fd_safer (open (file, flags, mode));
51}
diff --git a/lib/pipe-safer.c b/lib/pipe-safer.c
new file mode 100644
index 0000000..fb02d72
--- /dev/null
+++ b/lib/pipe-safer.c
@@ -0,0 +1,50 @@
1/* Invoke pipe, but avoid some glitches.
2 Copyright (C) 2005 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
17
18/* Written by Jim Meyering. */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include "unistd-safer.h"
25
26#include <unistd.h>
27
28/* Like pipe, but ensure that neither of the file descriptors is
29 STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. */
30
31int
32pipe_safer (int fd[2])
33{
34 int fail = pipe (fd);
35 if (fail)
36 return fail;
37
38 {
39 int i;
40 for (i = 0; i < 2; i++)
41 {
42 int f = fd_safer (fd[i]);
43 if (f < 0)
44 return -1;
45 fd[i] = f;
46 }
47 }
48
49 return 0;
50}
diff --git a/lib/unistd--.h b/lib/unistd--.h
new file mode 100644
index 0000000..1fe6ce8
--- /dev/null
+++ b/lib/unistd--.h
@@ -0,0 +1,28 @@
1/* Like unistd.h, but redefine some names to avoid glitches.
2
3 Copyright (C) 2005 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19/* Written by Paul Eggert. */
20
21#include <unistd.h>
22#include "unistd-safer.h"
23
24#undef dup
25#define dup dup_safer
26
27#undef pipe
28#define pipe pipe_safer
diff --git a/lib/unistd-safer.h b/lib/unistd-safer.h
new file mode 100644
index 0000000..f95999d
--- /dev/null
+++ b/lib/unistd-safer.h
@@ -0,0 +1,23 @@
1/* Invoke unistd-like functions, but avoid some glitches.
2
3 Copyright (C) 2001, 2003, 2005 Free Software Foundation, Inc.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19/* Written by Paul Eggert. */
20
21int dup_safer (int);
22int fd_safer (int);
23int pipe_safer (int[2]);