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curl/src/tool_doswin.c
Jay Satiro 4fc80f3e75 tool_doswin: Support for literal path prefix \\?\ 
For example something like --output \\?\C:\foo
2016-02-09 03:28:58 -05:00

675 lines
19 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "tool_setup.h"
#if defined(MSDOS) || defined(WIN32)
#if defined(HAVE_LIBGEN_H) && defined(HAVE_BASENAME)
# include <libgen.h>
#endif
#ifdef WIN32
# include "tool_cfgable.h"
# include "tool_libinfo.h"
#endif
#include "tool_bname.h"
#include "tool_doswin.h"
#include "memdebug.h" /* keep this as LAST include */
/*
* Macros ALWAYS_TRUE and ALWAYS_FALSE are used to avoid compiler warnings.
*/
#define ALWAYS_TRUE (1)
#define ALWAYS_FALSE (0)
#if defined(_MSC_VER) && !defined(__POCC__)
# undef ALWAYS_TRUE
# undef ALWAYS_FALSE
# if (_MSC_VER < 1500)
# define ALWAYS_TRUE (0, 1)
# define ALWAYS_FALSE (1, 0)
# else
# define ALWAYS_TRUE \
__pragma(warning(push)) \
__pragma(warning(disable:4127)) \
(1) \
__pragma(warning(pop))
# define ALWAYS_FALSE \
__pragma(warning(push)) \
__pragma(warning(disable:4127)) \
(0) \
__pragma(warning(pop))
# endif
#endif
#ifdef WIN32
# undef PATH_MAX
# define PATH_MAX MAX_PATH
#endif
#ifndef S_ISCHR
# ifdef S_IFCHR
# define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
# else
# define S_ISCHR(m) (0) /* cannot tell if file is a device */
# endif
#endif
#ifdef WIN32
# define _use_lfn(f) ALWAYS_TRUE /* long file names always available */
#elif !defined(__DJGPP__) || (__DJGPP__ < 2) /* DJGPP 2.0 has _use_lfn() */
# define _use_lfn(f) ALWAYS_FALSE /* long file names never available */
#elif defined(__DJGPP__)
# include <fcntl.h> /* _use_lfn(f) prototype */
#endif
#ifndef UNITTESTS
static SANITIZEcode truncate_dryrun(const char *path,
const size_t truncate_pos);
#ifdef MSDOS
static SANITIZEcode msdosify(char **const sanitized, const char *file_name,
int flags);
#endif
static SANITIZEcode rename_if_reserved_dos_device_name(char **const sanitized,
const char *file_name,
int flags);
#endif /* !UNITTESTS (static declarations used if no unit tests) */
/*
Sanitize a file or path name.
All banned characters are replaced by underscores, for example:
f?*foo => f__foo
f:foo::$DATA => f_foo__$DATA
f:\foo:bar => f__foo_bar
f:\foo:bar => f:\foo:bar (flag SANITIZE_ALLOW_PATH)
This function was implemented according to the guidelines in 'Naming Files,
Paths, and Namespaces' section 'Naming Conventions'.
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247.aspx
Flags
-----
SANITIZE_ALLOW_COLONS: Allow colons.
Without this flag colons are sanitized.
SANITIZE_ALLOW_PATH: Allow path separators and colons.
Without this flag path separators and colons are sanitized.
SANITIZE_ALLOW_RESERVED: Allow reserved device names.
Without this flag a reserved device name is renamed (COM1 => _COM1) unless it's
in a UNC prefixed path.
SANITIZE_ALLOW_TRUNCATE: Allow truncating a long filename.
Without this flag if the sanitized filename or path will be too long an error
occurs. With this flag the filename --and not any other parts of the path-- may
be truncated to at least a single character. A filename followed by an
alternate data stream (ADS) cannot be truncated in any case.
Success: (SANITIZE_ERR_OK) *sanitized points to a sanitized copy of file_name.
Failure: (!= SANITIZE_ERR_OK) *sanitized is NULL.
*/
SANITIZEcode sanitize_file_name(char **const sanitized, const char *file_name,
int flags)
{
char *p, *target;
size_t len;
SANITIZEcode sc;
size_t max_sanitized_len;
if(!sanitized)
return SANITIZE_ERR_BAD_ARGUMENT;
*sanitized = NULL;
if(!file_name)
return SANITIZE_ERR_BAD_ARGUMENT;
if((flags & SANITIZE_ALLOW_PATH)) {
#ifndef MSDOS
if(file_name[0] == '\\' && file_name[1] == '\\')
/* UNC prefixed path \\ (eg \\?\C:\foo) */
max_sanitized_len = 32767-1;
else
#endif
max_sanitized_len = PATH_MAX-1;
}
else
/* The maximum length of a filename.
FILENAME_MAX is often the same as PATH_MAX, in other words it is 260 and
does not discount the path information therefore we shouldn't use it. */
max_sanitized_len = (PATH_MAX-1 > 255) ? 255 : PATH_MAX-1;
len = strlen(file_name);
if(len > max_sanitized_len) {
if(!(flags & SANITIZE_ALLOW_TRUNCATE) ||
truncate_dryrun(file_name, max_sanitized_len))
return SANITIZE_ERR_INVALID_PATH;
len = max_sanitized_len;
}
target = malloc(len + 1);
if(!target)
return SANITIZE_ERR_OUT_OF_MEMORY;
strncpy(target, file_name, len);
target[len] = '\0';
#ifndef MSDOS
if((flags & SANITIZE_ALLOW_PATH) && !strncmp(target, "\\\\?\\", 4))
/* Skip the literal path prefix \\?\ */
p = target + 4;
else
#endif
p = target;
/* replace control characters and other banned characters */
for(; *p; ++p) {
const char *banned;
if((1 <= *p && *p <= 31) ||
(!(flags & (SANITIZE_ALLOW_COLONS|SANITIZE_ALLOW_PATH)) && *p == ':') ||
(!(flags & SANITIZE_ALLOW_PATH) && (*p == '/' || *p == '\\'))) {
*p = '_';
continue;
}
for(banned = "|<>\"?*"; *banned; ++banned) {
if(*p == *banned) {
*p = '_';
break;
}
}
}
/* remove trailing spaces and periods if not allowing paths */
if(!(flags & SANITIZE_ALLOW_PATH) && len) {
char *clip = NULL;
p = &target[len];
do {
--p;
if(*p != ' ' && *p != '.')
break;
clip = p;
} while(p != target);
if(clip) {
*clip = '\0';
len = clip - target;
}
}
#ifdef MSDOS
sc = msdosify(&p, target, flags);
free(target);
if(sc)
return sc;
target = p;
len = strlen(target);
if(len > max_sanitized_len) {
free(target);
return SANITIZE_ERR_INVALID_PATH;
}
#endif
if(!(flags & SANITIZE_ALLOW_RESERVED)) {
sc = rename_if_reserved_dos_device_name(&p, target, flags);
free(target);
if(sc)
return sc;
target = p;
len = strlen(target);
if(len > max_sanitized_len) {
free(target);
return SANITIZE_ERR_INVALID_PATH;
}
}
*sanitized = target;
return SANITIZE_ERR_OK;
}
/*
Test if truncating a path to a file will leave at least a single character in
the filename. Filenames suffixed by an alternate data stream can't be
truncated. This performs a dry run, nothing is modified.
Good truncate_pos 9: C:\foo\bar => C:\foo\ba
Good truncate_pos 6: C:\foo => C:\foo
Good truncate_pos 5: C:\foo => C:\fo
Bad* truncate_pos 5: C:foo => C:foo
Bad truncate_pos 5: C:\foo:ads => C:\fo
Bad truncate_pos 9: C:\foo:ads => C:\foo:ad
Bad truncate_pos 5: C:\foo\bar => C:\fo
Bad truncate_pos 5: C:\foo\ => C:\fo
Bad truncate_pos 7: C:\foo\ => C:\foo\
Error truncate_pos 7: C:\foo => (pos out of range)
Bad truncate_pos 1: C:\foo\ => C
* C:foo is ambiguous, C could end up being a drive or file therefore something
like C:superlongfilename can't be truncated.
Returns
SANITIZE_ERR_OK: Good -- 'path' can be truncated
SANITIZE_ERR_INVALID_PATH: Bad -- 'path' cannot be truncated
!= SANITIZE_ERR_OK && != SANITIZE_ERR_INVALID_PATH: Error
*/
SANITIZEcode truncate_dryrun(const char *path, const size_t truncate_pos)
{
size_t len;
if(!path)
return SANITIZE_ERR_BAD_ARGUMENT;
len = strlen(path);
if(truncate_pos > len)
return SANITIZE_ERR_BAD_ARGUMENT;
if(!len || !truncate_pos)
return SANITIZE_ERR_INVALID_PATH;
if(strpbrk(&path[truncate_pos - 1], "\\/:"))
return SANITIZE_ERR_INVALID_PATH;
/* C:\foo can be truncated but C:\foo:ads can't */
if(truncate_pos > 1) {
const char *p = &path[truncate_pos - 1];
do {
--p;
if(*p == ':')
return SANITIZE_ERR_INVALID_PATH;
} while(p != path && *p != '\\' && *p != '/');
}
return SANITIZE_ERR_OK;
}
/* The functions msdosify, rename_if_dos_device_name and __crt0_glob_function
* were taken with modification from the DJGPP port of tar 1.12. They use
* algorithms originally from DJTAR.
*/
/*
Extra sanitization MSDOS for file_name.
This is a supporting function for sanitize_file_name.
Warning: This is an MSDOS legacy function and was purposely written in a way
that some path information may pass through. For example drive letter names
(C:, D:, etc) are allowed to pass through. For sanitizing a filename use
sanitize_file_name.
Success: (SANITIZE_ERR_OK) *sanitized points to a sanitized copy of file_name.
Failure: (!= SANITIZE_ERR_OK) *sanitized is NULL.
*/
#if defined(MSDOS) || defined(UNITTESTS)
SANITIZEcode msdosify(char **const sanitized, const char *file_name,
int flags)
{
char dos_name[PATH_MAX];
static const char illegal_chars_dos[] = ".+, ;=[]" /* illegal in DOS */
"|<>/\\\":?*"; /* illegal in DOS & W95 */
static const char *illegal_chars_w95 = &illegal_chars_dos[8];
int idx, dot_idx;
const char *s = file_name;
char *d = dos_name;
const char *const dlimit = dos_name + sizeof(dos_name) - 1;
const char *illegal_aliens = illegal_chars_dos;
size_t len = sizeof(illegal_chars_dos) - 1;
if(!sanitized)
return SANITIZE_ERR_BAD_ARGUMENT;
*sanitized = NULL;
if(!file_name)
return SANITIZE_ERR_BAD_ARGUMENT;
if(strlen(file_name) > PATH_MAX-1 &&
(!(flags & SANITIZE_ALLOW_TRUNCATE) ||
truncate_dryrun(file_name, PATH_MAX-1)))
return SANITIZE_ERR_INVALID_PATH;
/* Support for Windows 9X VFAT systems, when available. */
if(_use_lfn(file_name)) {
illegal_aliens = illegal_chars_w95;
len -= (illegal_chars_w95 - illegal_chars_dos);
}
/* Get past the drive letter, if any. */
if(s[0] >= 'A' && s[0] <= 'z' && s[1] == ':') {
*d++ = *s++;
*d = ((flags & (SANITIZE_ALLOW_COLONS|SANITIZE_ALLOW_PATH))) ? ':' : '_';
++d, ++s;
}
for(idx = 0, dot_idx = -1; *s && d < dlimit; s++, d++) {
if(memchr(illegal_aliens, *s, len)) {
if((flags & (SANITIZE_ALLOW_COLONS|SANITIZE_ALLOW_PATH)) && *s == ':')
*d = ':';
else if((flags & SANITIZE_ALLOW_PATH) && (*s == '/' || *s == '\\'))
*d = *s;
/* Dots are special: DOS doesn't allow them as the leading character,
and a file name cannot have more than a single dot. We leave the
first non-leading dot alone, unless it comes too close to the
beginning of the name: we want sh.lex.c to become sh_lex.c, not
sh.lex-c. */
else if(*s == '.') {
if((flags & SANITIZE_ALLOW_PATH) && idx == 0 &&
(s[1] == '/' || s[1] == '\\' ||
(s[1] == '.' && (s[2] == '/' || s[2] == '\\')))) {
/* Copy "./" and "../" verbatim. */
*d++ = *s++;
if(d == dlimit)
break;
if(*s == '.') {
*d++ = *s++;
if(d == dlimit)
break;
}
*d = *s;
}
else if(idx == 0)
*d = '_';
else if(dot_idx >= 0) {
if(dot_idx < 5) { /* 5 is a heuristic ad-hoc'ery */
d[dot_idx - idx] = '_'; /* replace previous dot */
*d = '.';
}
else
*d = '-';
}
else
*d = '.';
if(*s == '.')
dot_idx = idx;
}
else if(*s == '+' && s[1] == '+') {
if(idx - 2 == dot_idx) { /* .c++, .h++ etc. */
*d++ = 'x';
if(d == dlimit)
break;
*d = 'x';
}
else {
/* libg++ etc. */
if(dlimit - d < 4) {
*d++ = 'x';
if(d == dlimit)
break;
*d = 'x';
}
else {
memcpy (d, "plus", 4);
d += 3;
}
}
s++;
idx++;
}
else
*d = '_';
}
else
*d = *s;
if(*s == '/' || *s == '\\') {
idx = 0;
dot_idx = -1;
}
else
idx++;
}
*d = '\0';
if(*s) {
/* dos_name is truncated, check that truncation requirements are met,
specifically truncating a filename suffixed by an alternate data stream
or truncating the entire filename is not allowed. */
if(!(flags & SANITIZE_ALLOW_TRUNCATE) || strpbrk(s, "\\/:") ||
truncate_dryrun(dos_name, d - dos_name))
return SANITIZE_ERR_INVALID_PATH;
}
*sanitized = strdup(dos_name);
return (*sanitized ? SANITIZE_ERR_OK : SANITIZE_ERR_OUT_OF_MEMORY);
}
#endif /* MSDOS || UNITTESTS */
/*
Rename file_name if it's a reserved dos device name.
This is a supporting function for sanitize_file_name.
Warning: This is an MSDOS legacy function and was purposely written in a way
that some path information may pass through. For example drive letter names
(C:, D:, etc) are allowed to pass through. For sanitizing a filename use
sanitize_file_name.
Success: (SANITIZE_ERR_OK) *sanitized points to a sanitized copy of file_name.
Failure: (!= SANITIZE_ERR_OK) *sanitized is NULL.
*/
SANITIZEcode rename_if_reserved_dos_device_name(char **const sanitized,
const char *file_name,
int flags)
{
/* We could have a file whose name is a device on MS-DOS. Trying to
* retrieve such a file would fail at best and wedge us at worst. We need
* to rename such files. */
char *p, *base;
char fname[PATH_MAX];
#ifdef MSDOS
struct_stat st_buf;
#endif
if(!sanitized)
return SANITIZE_ERR_BAD_ARGUMENT;
*sanitized = NULL;
if(!file_name)
return SANITIZE_ERR_BAD_ARGUMENT;
/* Ignore UNC prefixed paths, they are allowed to contain a reserved name. */
#ifndef MSDOS
if((flags & SANITIZE_ALLOW_PATH) &&
file_name[0] == '\\' && file_name[1] == '\\') {
size_t len = strlen(file_name);
*sanitized = malloc(len + 1);
if(!*sanitized)
return SANITIZE_ERR_OUT_OF_MEMORY;
strncpy(*sanitized, file_name, len + 1);
return SANITIZE_ERR_OK;
}
#endif
if(strlen(file_name) > PATH_MAX-1 &&
(!(flags & SANITIZE_ALLOW_TRUNCATE) ||
truncate_dryrun(file_name, PATH_MAX-1)))
return SANITIZE_ERR_INVALID_PATH;
strncpy(fname, file_name, PATH_MAX-1);
fname[PATH_MAX-1] = '\0';
base = basename(fname);
/* Rename reserved device names that are known to be accessible without \\.\
Examples: CON => _CON, CON.EXT => CON_EXT, CON:ADS => CON_ADS
https://support.microsoft.com/en-us/kb/74496
https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247.aspx
*/
for(p = fname; p; p = (p == fname && fname != base ? base : NULL)) {
size_t p_len;
int x = (curl_strnequal(p, "CON", 3) ||
curl_strnequal(p, "PRN", 3) ||
curl_strnequal(p, "AUX", 3) ||
curl_strnequal(p, "NUL", 3)) ? 3 :
(curl_strnequal(p, "CLOCK$", 6)) ? 6 :
(curl_strnequal(p, "COM", 3) || curl_strnequal(p, "LPT", 3)) ?
(('1' <= p[3] && p[3] <= '9') ? 4 : 3) : 0;
if(!x)
continue;
/* the devices may be accessible with an extension or ADS, for
example CON.AIR and 'CON . AIR' and CON:AIR access console */
for(; p[x] == ' '; ++x)
;
if(p[x] == '.') {
p[x] = '_';
continue;
}
else if(p[x] == ':') {
if(!(flags & (SANITIZE_ALLOW_COLONS|SANITIZE_ALLOW_PATH))) {
p[x] = '_';
continue;
}
++x;
}
else if(p[x]) /* no match */
continue;
/* p points to 'CON' or 'CON ' or 'CON:', etc */
p_len = strlen(p);
/* Prepend a '_' */
if(strlen(fname) == PATH_MAX-1) {
--p_len;
if(!(flags & SANITIZE_ALLOW_TRUNCATE) || truncate_dryrun(p, p_len))
return SANITIZE_ERR_INVALID_PATH;
p[p_len] = '\0';
}
memmove(p + 1, p, p_len + 1);
p[0] = '_';
++p_len;
/* if fname was just modified then the basename pointer must be updated */
if(p == fname)
base = basename(fname);
}
/* This is the legacy portion from rename_if_dos_device_name that checks for
reserved device names. It only works on MSDOS. On Windows XP the stat
check errors with EINVAL if the device name is reserved. On Windows
Vista/7/8 it sets mode S_IFREG (regular file or device). According to MSDN
stat doc the latter behavior is correct, but that doesn't help us identify
whether it's a reserved device name and not a regular file name. */
#ifdef MSDOS
if(base && ((stat(base, &st_buf)) == 0) && (S_ISCHR(st_buf.st_mode))) {
/* Prepend a '_' */
size_t blen = strlen(base);
if(blen) {
if(strlen(fname) == PATH_MAX-1) {
--blen;
if(!(flags & SANITIZE_ALLOW_TRUNCATE) || truncate_dryrun(base, blen))
return SANITIZE_ERR_INVALID_PATH;
base[blen] = '\0';
}
memmove(base + 1, base, blen + 1);
base[0] = '_';
++blen;
}
}
#endif
*sanitized = strdup(fname);
return (*sanitized ? SANITIZE_ERR_OK : SANITIZE_ERR_OUT_OF_MEMORY);
}
#if defined(MSDOS) && (defined(__DJGPP__) || defined(__GO32__))
/*
* Disable program default argument globbing. We do it on our own.
*/
char **__crt0_glob_function(char *arg)
{
(void)arg;
return (char**)0;
}
#endif /* MSDOS && (__DJGPP__ || __GO32__) */
#ifdef WIN32
/*
* Function to find CACert bundle on a Win32 platform using SearchPath.
* (SearchPath is already declared via inclusions done in setup header file)
* (Use the ASCII version instead of the unicode one!)
* The order of the directories it searches is:
* 1. application's directory
* 2. current working directory
* 3. Windows System directory (e.g. C:\windows\system32)
* 4. Windows Directory (e.g. C:\windows)
* 5. all directories along %PATH%
*
* For WinXP and later search order actually depends on registry value:
* HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\SafeProcessSearchMode
*/
CURLcode FindWin32CACert(struct OperationConfig *config,
const char *bundle_file)
{
CURLcode result = CURLE_OK;
/* search and set cert file only if libcurl supports SSL */
if(curlinfo->features & CURL_VERSION_SSL) {
DWORD res_len;
DWORD buf_tchar_size = PATH_MAX + 1;
DWORD buf_bytes_size = sizeof(TCHAR) * buf_tchar_size;
char *ptr = NULL;
char *buf = malloc(buf_bytes_size);
if(!buf)
return CURLE_OUT_OF_MEMORY;
buf[0] = '\0';
res_len = SearchPathA(NULL, bundle_file, NULL, buf_tchar_size, buf, &ptr);
if(res_len > 0) {
Curl_safefree(config->cacert);
config->cacert = strdup(buf);
if(!config->cacert)
result = CURLE_OUT_OF_MEMORY;
}
Curl_safefree(buf);
}
return result;
}
#endif /* WIN32 */
#endif /* MSDOS || WIN32 */
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