mirror of
https://sourceware.org/git/glibc.git
synced 2025-01-03 00:10:10 +00:00
Tue Jun 18 17:56:44 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* stdlib/test-canon.c: New test program contributed by David Mosberger. * stdlib/Makefile (tests): Add test-canon. * stdlib/canonicalize.c: Rewritten by David Mosberger.
This commit is contained in:
Roland McGrath
parent
1c719dd82c
commit
394f4f179e
@ -45,7 +45,8 @@ routines := \
|
||||
rpmatch strfmon
|
||||
|
||||
distribute := exit.h grouping.h
|
||||
tests := tst-strtol tst-strtod testmb testrand testsort testdiv
|
||||
tests := tst-strtol tst-strtod testmb testrand testsort testdiv \
|
||||
test-canon
|
||||
|
||||
|
||||
# Several mpn functions from GNU MP are used by the strtod function.
|
||||
|
||||
@ -17,33 +17,34 @@ License along with the GNU C Library; see the file COPYING.LIB. If
|
||||
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
||||
Cambridge, MA 02139, USA. */
|
||||
|
||||
#include <assert.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
#include <limits.h>
|
||||
#include <sys/param.h>
|
||||
#include <sys/stat.h>
|
||||
#include <errno.h>
|
||||
|
||||
/* Return the canonical absolute name of file NAME. The last file name
|
||||
component need not exist, and may be a symlink to a nonexistent file.
|
||||
If RESOLVED is null, the result is malloc'd; otherwise, if the canonical
|
||||
name is PATH_MAX chars or more, returns null with `errno' set to
|
||||
ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars, returns the
|
||||
name in RESOLVED. */
|
||||
/* Return the canonical absolute name of file NAME. A canonical name
|
||||
does not contain any `.', `..' components nor any repeated path
|
||||
separators ('/') or symlinks. All path components must exist. If
|
||||
RESOLVED is null, the result is malloc'd; otherwise, if the
|
||||
canonical name is PATH_MAX chars or more, returns null with `errno'
|
||||
set to ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars,
|
||||
returns the name in RESOLVED. If the name cannot be resolved and
|
||||
RESOLVED is non-NULL, it contains the path of the first component
|
||||
that cannot be resolved. If the path can be resolved, RESOLVED
|
||||
holds the same value as the value returned. */
|
||||
|
||||
static char *
|
||||
canonicalize (const char *name, char *resolved)
|
||||
{
|
||||
struct stat st;
|
||||
const char *p;
|
||||
char *rpath, *dest, *extra_buf = NULL;
|
||||
const char *start, *end, *rpath_limit;
|
||||
long int path_max;
|
||||
char *result, *dir, *end;
|
||||
size_t namelen;
|
||||
int num_links = 0;
|
||||
|
||||
if (! resolved)
|
||||
path_max = 0;
|
||||
else
|
||||
{
|
||||
#ifdef PATH_MAX
|
||||
path_max = PATH_MAX;
|
||||
#else
|
||||
@ -51,141 +52,118 @@ canonicalize (const char *name, char *resolved)
|
||||
if (path_max <= 0)
|
||||
path_max = 1024;
|
||||
#endif
|
||||
}
|
||||
|
||||
p = strrchr (name, '/');
|
||||
if (!p)
|
||||
{
|
||||
dir = (char *) ".";
|
||||
p = name;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (p++ == name)
|
||||
dir = (char *) "/";
|
||||
else
|
||||
{
|
||||
dir = __alloca (p - name);
|
||||
memcpy (dir, name, p - name - 1);
|
||||
dir[p - name] = '\0';
|
||||
}
|
||||
}
|
||||
rpath = resolved;
|
||||
rpath_limit = rpath + path_max;
|
||||
if (!resolved)
|
||||
rpath = malloc (path_max);
|
||||
|
||||
result = __canonicalize_directory_name_internal (dir, resolved, path_max);
|
||||
if (!result)
|
||||
return NULL;
|
||||
strcpy (rpath, "/");
|
||||
if (name[0] != '/' && !getcwd (rpath, path_max))
|
||||
goto error;
|
||||
dest = rpath + strlen (rpath);
|
||||
|
||||
/* Reconstruct the file name in the canonicalized directory. */
|
||||
namelen = strlen (name);
|
||||
end = strchr (result, '\0');
|
||||
for (start = end = name; *start; start = end)
|
||||
{
|
||||
struct stat st;
|
||||
int n;
|
||||
|
||||
/* skip sequence of multiple path-separators: */
|
||||
while (*start == '/') ++start;
|
||||
|
||||
/* find end of path component: */
|
||||
for (end = start; *end && *end != '/'; ++end);
|
||||
|
||||
if (end - start == 0)
|
||||
break;
|
||||
else if (strncmp (start, ".", end - start) == 0)
|
||||
/* nothing */;
|
||||
else if (strncmp (start, "..", end - start) == 0) {
|
||||
/* back up to previous component, ignore if at root already: */
|
||||
if (dest > rpath + 1)
|
||||
while ((--dest)[-1] != '/');
|
||||
} else
|
||||
{
|
||||
size_t new_size;
|
||||
|
||||
if (dest[-1] != '/')
|
||||
*dest++ = '/';
|
||||
|
||||
if (dest + (end - start) >= rpath_limit)
|
||||
{
|
||||
if (resolved)
|
||||
{
|
||||
/* Make sure the name is not too long. */
|
||||
if (end - result + namelen > path_max)
|
||||
{
|
||||
errno = ENAMETOOLONG;
|
||||
goto error;
|
||||
}
|
||||
new_size = rpath_limit - rpath;
|
||||
if (end - start + 1 > path_max)
|
||||
new_size += end - start + 1;
|
||||
else
|
||||
new_size += path_max;
|
||||
rpath = realloc (rpath, new_size);
|
||||
rpath_limit = rpath + new_size;
|
||||
if (!rpath)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
memcpy (dest, start, end - start);
|
||||
dest += end - start;
|
||||
*dest = '\0';
|
||||
|
||||
if (__lstat (rpath, &st) < 0)
|
||||
goto error;
|
||||
|
||||
if (S_ISLNK (st.st_mode))
|
||||
{
|
||||
char * buf = __alloca(path_max);
|
||||
|
||||
if (++num_links > MAXSYMLINKS)
|
||||
{
|
||||
errno = ELOOP;
|
||||
goto error;
|
||||
}
|
||||
|
||||
n = readlink (rpath, buf, path_max);
|
||||
if (n < 0)
|
||||
goto error;
|
||||
buf[n] = '\0';
|
||||
|
||||
if (!extra_buf)
|
||||
extra_buf = __alloca (path_max);
|
||||
|
||||
if (n + strlen (end) >= path_max)
|
||||
{
|
||||
errno = ENAMETOOLONG;
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* careful here, end may be a pointer into extra_buf... */
|
||||
strcat (buf, end);
|
||||
strcpy (extra_buf, buf);
|
||||
name = end = extra_buf;
|
||||
|
||||
if (buf[0] == '/')
|
||||
dest = rpath + 1; /* it's an absolute symlink */
|
||||
else
|
||||
/* back up to previous component, ignore if at root already: */
|
||||
if (dest > rpath + 1)
|
||||
while ((--dest)[-1] != '/');
|
||||
}
|
||||
else
|
||||
{
|
||||
/* The name is dynamically allocated. Extend it. */
|
||||
char *new = realloc (result, end - result + namelen + 1);
|
||||
if (! new)
|
||||
{
|
||||
free (result);
|
||||
num_links = 0;
|
||||
}
|
||||
}
|
||||
if (dest > rpath + 1 && dest[-1] == '/')
|
||||
--dest;
|
||||
*dest = '\0';
|
||||
return rpath;
|
||||
|
||||
error:
|
||||
if (!resolved)
|
||||
free (rpath);
|
||||
return NULL;
|
||||
}
|
||||
end = new + (end - result);
|
||||
result = new;
|
||||
}
|
||||
memcpy (end, name, namelen + 1);
|
||||
|
||||
while (__lstat (result, &st) == 0 && S_ISLNK (st.st_mode))
|
||||
{
|
||||
/* The file is a symlink. Read its contents. */
|
||||
ssize_t n;
|
||||
read_link_contents:
|
||||
n = readlink (result, end,
|
||||
resolved ? result + path_max - end : namelen + 1);
|
||||
if (n < 0)
|
||||
/* Error reading the link contents. */
|
||||
return NULL;
|
||||
|
||||
if (end[0] == '/')
|
||||
{
|
||||
/* Absolute symlink. */
|
||||
if (resolved ? (end + n < result + path_max) : (n < namelen + 1))
|
||||
{
|
||||
/* It fit in our buffer, so we have the whole thing. */
|
||||
memcpy (result, end, n);
|
||||
result[n] = '\0';
|
||||
}
|
||||
else if (resolved)
|
||||
{
|
||||
/* It didn't fit in the remainder of the buffer. Either it
|
||||
fits in the entire buffer, or it doesn't. Copy back the
|
||||
unresolved name onto the canonical directory and try once
|
||||
more. */
|
||||
memcpy (end, name, namelen + 1);
|
||||
n = readlink (result, result, path_max);
|
||||
if (n < 0)
|
||||
return NULL;
|
||||
if (n == path_max)
|
||||
{
|
||||
errno = ENAMETOOLONG;
|
||||
return NULL;
|
||||
}
|
||||
result[n] = '\0';
|
||||
}
|
||||
else
|
||||
/* Try again with a bigger buffer. */
|
||||
goto extend_buffer;
|
||||
|
||||
/* Check the resolved name for being a symlink too. */
|
||||
continue;
|
||||
}
|
||||
|
||||
if (resolved)
|
||||
{
|
||||
if (end + n == result + path_max)
|
||||
{
|
||||
/* The link contents we read fill the buffer completely.
|
||||
There may be even more to read, and there is certainly no
|
||||
space for the null terminator. */
|
||||
errno = ENAMETOOLONG;
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
else if (n == namelen + 1)
|
||||
extend_buffer:
|
||||
{
|
||||
/* The name buffer is dynamically allocated. Extend it. */
|
||||
char *new;
|
||||
|
||||
/* Copy back the unresolved name onto the canonical directory. */
|
||||
memcpy (end, name, namelen + 1);
|
||||
|
||||
/* Make more space for readlink. */
|
||||
namelen *= 2;
|
||||
new = realloc (result, end - result + namelen + 1);
|
||||
if (! new)
|
||||
{
|
||||
free (result);
|
||||
return NULL;
|
||||
}
|
||||
end = new + (end - result);
|
||||
result = new;
|
||||
|
||||
goto read_link_contents;
|
||||
}
|
||||
|
||||
/* Terminate the string; readlink does not. */
|
||||
end[n] = '\0';
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
weak_alias (canonicalize, realpath)
|
||||
|
||||
|
||||
181
stdlib/test-canon.c
Normal file
181
stdlib/test-canon.c
Normal file
@ -0,0 +1,181 @@
|
||||
/* Test program for returning the canonical absolute name of a given file.
|
||||
Copyright (C) 1996 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by David Mosberger <davidm@azstarnet.com>.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Library General Public License as
|
||||
published by the Free Software Foundation; either version 2 of the
|
||||
License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library 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
|
||||
Library General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Library General Public
|
||||
License along with the GNU C Library; see the file COPYING.LIB. If
|
||||
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
||||
Cambridge, MA 02139, USA. */
|
||||
|
||||
/* This file must be run from within a directory called "stdlib". */
|
||||
|
||||
#include <errno.h>
|
||||
#include <fcntl.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
#include <sys/param.h>
|
||||
|
||||
static char cwd[1024];
|
||||
static size_t cwd_len;
|
||||
|
||||
struct {
|
||||
const char * name;
|
||||
const char * value;
|
||||
} symlinks[] = {
|
||||
{"SYMLINK_LOOP", "SYMLINK_LOOP"},
|
||||
{"SYMLINK_1", "."},
|
||||
{"SYMLINK_2", "//////./../../etc"},
|
||||
{"SYMLINK_3", "SYMLINK_1"},
|
||||
{"SYMLINK_4", "SYMLINK_2"},
|
||||
{"SYMLINK_5", "doesNotExist"},
|
||||
};
|
||||
|
||||
struct {
|
||||
const char * in, * out, * resolved;
|
||||
int errno;
|
||||
} tests[] = {
|
||||
/* 0 */
|
||||
{"/", "/"},
|
||||
{"/////////////////////////////////", "/"},
|
||||
{"/.././.././.././..///", "/"},
|
||||
{"/etc", "/etc"},
|
||||
{"/etc/../etc", "/etc"},
|
||||
/* 5 */
|
||||
{"/doesNotExist/../etc", 0, "/doesNotExist", ENOENT},
|
||||
{"./././././././././.", "."},
|
||||
{"/etc/.//doesNotExist", 0, "/etc/doesNotExist", ENOENT},
|
||||
{"./doesExist", "./doesExist"},
|
||||
{"./doesExist/", "./doesExist"},
|
||||
/* 10 */
|
||||
{"./doesExist/../doesExist", "./doesExist"},
|
||||
{"foobar", 0, "./foobar", ENOENT},
|
||||
{".", "."},
|
||||
{"./foobar", 0, "./foobar", ENOENT},
|
||||
{"SYMLINK_LOOP", 0, "./SYMLINK_LOOP", ELOOP},
|
||||
/* 15 */
|
||||
{"./SYMLINK_LOOP", 0, "./SYMLINK_LOOP", ELOOP},
|
||||
{"SYMLINK_1", "."},
|
||||
{"SYMLINK_1/foobar", 0, "./foobar", ENOENT},
|
||||
{"SYMLINK_2", "/etc"},
|
||||
{"SYMLINK_3", "."},
|
||||
/* 20 */
|
||||
{"SYMLINK_4", "/etc"},
|
||||
{"../stdlib/SYMLINK_1", "."},
|
||||
{"../stdlib/SYMLINK_2", "/etc"},
|
||||
{"../stdlib/SYMLINK_3", "."},
|
||||
{"../stdlib/SYMLINK_4", "/etc"},
|
||||
/* 25 */
|
||||
{"./SYMLINK_5", 0, "./doesNotExist", ENOENT},
|
||||
{"SYMLINK_5", 0, "./doesNotExist", ENOENT},
|
||||
{"SYMLINK_5/foobar", 0, "./doesNotExist", ENOENT},
|
||||
{"doesExist/../../stdlib/doesExist", "./doesExist"},
|
||||
{"doesExist/.././../stdlib/.", "."}
|
||||
};
|
||||
|
||||
|
||||
int
|
||||
check_path (const char * result, const char * expected)
|
||||
{
|
||||
int good;
|
||||
|
||||
if (!result)
|
||||
return (expected == NULL);
|
||||
|
||||
if (!expected)
|
||||
return 0;
|
||||
|
||||
if (expected[0] == '.' && (expected[1] == '/' || expected[1] == '\0'))
|
||||
good = (strncmp (result, cwd, cwd_len) == 0
|
||||
&& strcmp (result + cwd_len, expected + 1) == 0);
|
||||
else
|
||||
good = (strcmp (expected, result) == 0);
|
||||
|
||||
return good;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
main (int argc, char ** argv)
|
||||
{
|
||||
char * result;
|
||||
int fd, i, errors = 0;
|
||||
char buf[PATH_MAX];
|
||||
|
||||
getcwd (cwd, sizeof(buf));
|
||||
cwd_len = strlen (cwd);
|
||||
|
||||
for (i = 0; i < sizeof (symlinks) / sizeof (symlinks[0]); ++i)
|
||||
symlink (symlinks[i].value, symlinks[i].name);
|
||||
|
||||
fd = open("doesExist", O_CREAT | O_EXCL, 0777);
|
||||
|
||||
for (i = 0; i < sizeof (tests) / sizeof (tests[0]); ++i)
|
||||
{
|
||||
buf[0] = '\0';
|
||||
result = realpath (tests[i].in, buf);
|
||||
|
||||
if (!check_path (result, tests[i].out))
|
||||
{
|
||||
printf ("%s: flunked test %d (expected `%s', got `%s')\n",
|
||||
argv[0], i, tests[i].out ? tests[i].out : "NULL",
|
||||
result ? result : "NULL");
|
||||
++errors;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (!check_path (buf, tests[i].out ? tests[i].out : tests[i].resolved))
|
||||
{
|
||||
printf ("%s: flunked test %d (expected resolved `%s', got `%s')\n",
|
||||
argv[0], i, tests[i].out ? tests[i].out : tests[i].resolved,
|
||||
buf);
|
||||
++errors;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (!tests[i].out && errno != tests[i].errno)
|
||||
{
|
||||
printf ("%s: flunked test %d (expected errno %d, got %d)\n",
|
||||
argv[0], i, tests[i].errno, errno);
|
||||
++errors;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
getcwd (buf, sizeof(buf));
|
||||
if (strcmp (buf, cwd))
|
||||
{
|
||||
printf ("%s: current working directory changed from %s to %s\n",
|
||||
argv[0], cwd, buf);
|
||||
++errors;
|
||||
}
|
||||
|
||||
if (fd >= 0)
|
||||
unlink("doesExist");
|
||||
|
||||
for (i = 0; i < sizeof (symlinks) / sizeof (symlinks[0]); ++i)
|
||||
unlink (symlinks[i].name);
|
||||
|
||||
if (errors == 0)
|
||||
{
|
||||
puts ("No errors.");
|
||||
exit (EXIT_SUCCESS);
|
||||
}
|
||||
else
|
||||
{
|
||||
printf ("%d errors.\n", errors);
|
||||
exit (EXIT_FAILURE);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user