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/* pathchk -- check whether file names are valid or portable
Copyright (C) 1991-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include <wchar.h>
#include "system.h"
#include "quote.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "pathchk"
#define AUTHORS \
proper_name ("Paul Eggert"), \
proper_name ("David MacKenzie"), \
proper_name ("Jim Meyering")
#ifndef _POSIX_PATH_MAX
# define _POSIX_PATH_MAX 256
#endif
#ifndef _POSIX_NAME_MAX
# define _POSIX_NAME_MAX 14
#endif
#ifdef _XOPEN_NAME_MAX
# define NAME_MAX_MINIMUM _XOPEN_NAME_MAX
#else
# define NAME_MAX_MINIMUM _POSIX_NAME_MAX
#endif
#ifdef _XOPEN_PATH_MAX
# define PATH_MAX_MINIMUM _XOPEN_PATH_MAX
#else
# define PATH_MAX_MINIMUM _POSIX_PATH_MAX
#endif
#if ! (HAVE_PATHCONF && defined _PC_NAME_MAX && defined _PC_PATH_MAX)
# ifndef _PC_NAME_MAX
# define _PC_NAME_MAX 0
# define _PC_PATH_MAX 1
# endif
# ifndef pathconf
# define pathconf(file, flag) \
(flag == _PC_NAME_MAX ? NAME_MAX_MINIMUM : PATH_MAX_MINIMUM)
# endif
#endif
static bool validate_file_name (char *, bool, bool);
/* For long options that have no equivalent short option, use a
non-character as a pseudo short option, starting with CHAR_MAX + 1. */
enum
{
PORTABILITY_OPTION = CHAR_MAX + 1
};
static struct option const longopts[] =
{
{"portability", no_argument, nullptr, PORTABILITY_OPTION},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{nullptr, 0, nullptr, 0}
};
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("Usage: %s [OPTION]... NAME...\n"), program_name);
fputs (_("\
Diagnose invalid or non-portable file names.\n\
\n\
-p check for most POSIX systems\n\
-P check for empty names and leading \"-\"\n\
--portability check for all POSIX systems (equivalent to -p -P)\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
int
main (int argc, char **argv)
{
bool ok = true;
bool check_basic_portability = false;
bool check_extra_portability = false;
int optc;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
while ((optc = getopt_long (argc, argv, "+pP", longopts, nullptr)) != -1)
{
switch (optc)
{
case PORTABILITY_OPTION:
check_basic_portability = true;
check_extra_portability = true;
break;
case 'p':
check_basic_portability = true;
break;
case 'P':
check_extra_portability = true;
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (EXIT_FAILURE);
}
}
if (optind == argc)
{
error (0, 0, _("missing operand"));
usage (EXIT_FAILURE);
}
for (; optind < argc; ++optind)
ok &= validate_file_name (argv[optind],
check_basic_portability, check_extra_portability);
return ok ? EXIT_SUCCESS : EXIT_FAILURE;
}
/* If FILE contains a component with a leading "-", report an error
and return false; otherwise, return true. */
static bool
no_leading_hyphen (char const *file)
{
char const *p;
for (p = file; (p = strchr (p, '-')); p++)
if (p == file || p[-1] == '/')
{
error (0, 0, _("leading '-' in a component of file name %s"),
quoteaf (file));
return false;
}
return true;
}
/* If FILE (of length FILELEN) contains only portable characters,
return true, else report an error and return false. */
static bool
portable_chars_only (char const *file, size_t filelen)
{
size_t validlen = strspn (file,
("/"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789._-"));
char const *invalid = file + validlen;
if (*invalid)
{
mbstate_t mbstate = { 0, };
size_t charlen = mbrlen (invalid, filelen - validlen, &mbstate);
error (0, 0,
_("non-portable character %s in file name %s"),
quotearg_n_style_mem (1, locale_quoting_style, invalid,
(charlen <= MB_LEN_MAX ? charlen : 1)),
quoteaf_n (0, file));
return false;
}
return true;
}
/* Return the address of the start of the next file name component in F. */
ATTRIBUTE_PURE
static char *
component_start (char *f)
{
while (*f == '/')
f++;
return f;
}
/* Return the size of the file name component F. F must be nonempty. */
ATTRIBUTE_PURE
static size_t
component_len (char const *f)
{
size_t len;
for (len = 1; f[len] != '/' && f[len]; len++)
continue;
return len;
}
/* Make sure that
strlen (FILE) <= PATH_MAX
&& strlen (each-existing-directory-in-FILE) <= NAME_MAX
If CHECK_BASIC_PORTABILITY is true, compare against _POSIX_PATH_MAX and
_POSIX_NAME_MAX instead, and make sure that FILE contains no
characters not in the POSIX portable filename character set, which
consists of A-Z, a-z, 0-9, ., _, - (plus / for separators).
If CHECK_BASIC_PORTABILITY is false, make sure that all leading directories
along FILE that exist are searchable.
If CHECK_EXTRA_PORTABILITY is true, check that file name components do not
begin with "-".
If either CHECK_BASIC_PORTABILITY or CHECK_EXTRA_PORTABILITY is true,
check that the file name is not empty.
Return true if all of these tests are successful, false if any fail. */
static bool
validate_file_name (char *file, bool check_basic_portability,
bool check_extra_portability)
{
idx_t filelen = strlen (file);
/* Start of file name component being checked. */
char *start;
/* True if component lengths need to be checked. */
bool check_component_lengths;
/* True if the file is known to exist. */
bool file_exists = false;
if (check_extra_portability && ! no_leading_hyphen (file))
return false;
if ((check_basic_portability || check_extra_portability)
&& filelen == 0)
{
/* Fail, since empty names are not portable. As of
2005-01-06 POSIX does not address whether "pathchk -p ''"
should (or is allowed to) fail, so this is not a
conformance violation. */
error (0, 0, _("empty file name"));
return false;
}
if (check_basic_portability)
{
if (! portable_chars_only (file, filelen))
return false;
}
else
{
/* Check whether a file name component is in a directory that
is not searchable, or has some other serious problem.
POSIX does not allow "" as a file name, but some non-POSIX
hosts do (as an alias for "."), so allow "" if lstat does. */
struct stat st;
if (lstat (file, &st) == 0)
file_exists = true;
else if (errno != ENOENT || filelen == 0)
{
error (0, errno, "%s", quotef (file));
return false;
}
}
if (check_basic_portability
|| (! file_exists && PATH_MAX_MINIMUM <= filelen))
{
idx_t maxsize;
if (check_basic_portability)
maxsize = _POSIX_PATH_MAX;
else
{
long int size;
char const *dir = (*file == '/' ? "/" : ".");
errno = 0;
size = pathconf (dir, _PC_PATH_MAX);
if (size < 0 && errno != 0)
{
error (0, errno,
_("%s: unable to determine maximum file name length"),
dir);
return false;
}
maxsize = MIN (size, MIN (SSIZE_MAX, IDX_MAX));
}
if (maxsize <= filelen)
{
error (0, 0, _("limit %td exceeded by length %td of file name %s"),
maxsize - 1, filelen, quoteaf (file));
return false;
}
}
/* Check whether pathconf (..., _PC_NAME_MAX) can be avoided, i.e.,
whether all file name components are so short that they are valid
in any file system on this platform. If CHECK_BASIC_PORTABILITY, though,
it's more convenient to check component lengths below. */
check_component_lengths = check_basic_portability;
if (! check_component_lengths && ! file_exists)
{
for (start = file; *(start = component_start (start)); )
{
size_t length = component_len (start);
if (NAME_MAX_MINIMUM < length)
{
check_component_lengths = true;
break;
}
start += length;
}
}
if (check_component_lengths)
{
/* The limit on file name components for the current component.
This defaults to NAME_MAX_MINIMUM, for the sake of non-POSIX
systems (NFS, say?) where pathconf fails on "." or "/" with
errno == ENOENT. */
idx_t name_max = NAME_MAX_MINIMUM;
/* If nonzero, the known limit on file name components. */
idx_t known_name_max = check_basic_portability ? _POSIX_NAME_MAX : 0;
for (start = file; *(start = component_start (start)); )
{
idx_t length;
if (known_name_max)
name_max = known_name_max;
else
{
long int len;
char const *dir = (start == file ? "." : file);
char c = *start;
errno = 0;
*start = '\0';
len = pathconf (dir, _PC_NAME_MAX);
*start = c;
if (0 <= len)
name_max = MIN (len, MIN (SSIZE_MAX, IDX_MAX));
else
switch (errno)
{
case 0:
/* There is no limit. */
name_max = IDX_MAX;
break;
case ENOENT:
/* DIR does not exist; use its parent's maximum. */
known_name_max = name_max;
break;
default:
*start = '\0';
error (0, errno, "%s", quotef (dir));
*start = c;
return false;
}
}
length = component_len (start);
if (name_max < length)
{
char c = start[length];
start[length] = '\0';
error (0, 0,
_("limit %td exceeded by length %td "
"of file name component %s"),
name_max, length, quote (start));
start[length] = c;
return false;
}
start += length;
}
}
return true;
}
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