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cpython/Modules/_localemodule.c
Serhiy Storchaka f7eae0adfc [security] bpo-13617: Reject embedded null characters in wchar* strings. (#2302) 
Based on patch by Victor Stinner.

Add private C API function _PyUnicode_AsUnicode() which is similar to
PyUnicode_AsUnicode(), but checks for null characters.
2017-06-28 08:30:06 +03:00

687 lines
17 KiB
C
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/***********************************************************
Copyright (C) 1997, 2002, 2003, 2007, 2008 Martin von Loewis
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies.
This software comes with no warranty. Use at your own risk.
******************************************************************/
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include <stdio.h>
#include <locale.h>
#include <string.h>
#include <ctype.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#ifdef HAVE_LIBINTL_H
#include <libintl.h>
#endif
#ifdef HAVE_WCHAR_H
#include <wchar.h>
#endif
#if defined(MS_WINDOWS)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
PyDoc_STRVAR(locale__doc__, "Support for POSIX locales.");
static PyObject *Error;
/* support functions for formatting floating point numbers */
PyDoc_STRVAR(setlocale__doc__,
"(integer,string=None) -> string. Activates/queries locale processing.");
/* the grouping is terminated by either 0 or CHAR_MAX */
static PyObject*
copy_grouping(const char* s)
{
int i;
PyObject *result, *val = NULL;
if (s[0] == '\0') {
/* empty string: no grouping at all */
return PyList_New(0);
}
for (i = 0; s[i] != '\0' && s[i] != CHAR_MAX; i++)
; /* nothing */
result = PyList_New(i+1);
if (!result)
return NULL;
i = -1;
do {
i++;
val = PyLong_FromLong(s[i]);
if (!val)
break;
if (PyList_SetItem(result, i, val)) {
Py_DECREF(val);
val = NULL;
break;
}
} while (s[i] != '\0' && s[i] != CHAR_MAX);
if (!val) {
Py_DECREF(result);
return NULL;
}
return result;
}
static PyObject*
PyLocale_setlocale(PyObject* self, PyObject* args)
{
int category;
char *locale = NULL, *result;
PyObject *result_object;
if (!PyArg_ParseTuple(args, "i|z:setlocale", &category, &locale))
return NULL;
#if defined(MS_WINDOWS)
if (category < LC_MIN || category > LC_MAX)
{
PyErr_SetString(Error, "invalid locale category");
return NULL;
}
#endif
if (locale) {
/* set locale */
result = setlocale(category, locale);
if (!result) {
/* operation failed, no setting was changed */
PyErr_SetString(Error, "unsupported locale setting");
return NULL;
}
result_object = PyUnicode_DecodeLocale(result, NULL);
if (!result_object)
return NULL;
} else {
/* get locale */
result = setlocale(category, NULL);
if (!result) {
PyErr_SetString(Error, "locale query failed");
return NULL;
}
result_object = PyUnicode_DecodeLocale(result, NULL);
}
return result_object;
}
PyDoc_STRVAR(localeconv__doc__,
"() -> dict. Returns numeric and monetary locale-specific parameters.");
static PyObject*
PyLocale_localeconv(PyObject* self)
{
PyObject* result;
struct lconv *l;
PyObject *x;
result = PyDict_New();
if (!result)
return NULL;
/* if LC_NUMERIC is different in the C library, use saved value */
l = localeconv();
/* hopefully, the localeconv result survives the C library calls
involved herein */
#define RESULT(key, obj)\
do { \
if (obj == NULL) \
goto failed; \
if (PyDict_SetItemString(result, key, obj) < 0) { \
Py_DECREF(obj); \
goto failed; \
} \
Py_DECREF(obj); \
} while (0)
#define RESULT_STRING(s)\
do { \
x = PyUnicode_DecodeLocale(l->s, NULL); \
RESULT(#s, x); \
} while (0)
#define RESULT_INT(i)\
do { \
x = PyLong_FromLong(l->i); \
RESULT(#i, x); \
} while (0)
/* Numeric information */
RESULT_STRING(decimal_point);
RESULT_STRING(thousands_sep);
x = copy_grouping(l->grouping);
RESULT("grouping", x);
/* Monetary information */
RESULT_STRING(int_curr_symbol);
RESULT_STRING(currency_symbol);
RESULT_STRING(mon_decimal_point);
RESULT_STRING(mon_thousands_sep);
x = copy_grouping(l->mon_grouping);
RESULT("mon_grouping", x);
RESULT_STRING(positive_sign);
RESULT_STRING(negative_sign);
RESULT_INT(int_frac_digits);
RESULT_INT(frac_digits);
RESULT_INT(p_cs_precedes);
RESULT_INT(p_sep_by_space);
RESULT_INT(n_cs_precedes);
RESULT_INT(n_sep_by_space);
RESULT_INT(p_sign_posn);
RESULT_INT(n_sign_posn);
return result;
failed:
Py_XDECREF(result);
return NULL;
}
#if defined(HAVE_WCSCOLL)
PyDoc_STRVAR(strcoll__doc__,
"string,string -> int. Compares two strings according to the locale.");
static PyObject*
PyLocale_strcoll(PyObject* self, PyObject* args)
{
PyObject *os1, *os2, *result = NULL;
wchar_t *ws1 = NULL, *ws2 = NULL;
if (!PyArg_ParseTuple(args, "UU:strcoll", &os1, &os2))
return NULL;
/* Convert the unicode strings to wchar[]. */
ws1 = PyUnicode_AsWideCharString(os1, NULL);
if (ws1 == NULL)
goto done;
ws2 = PyUnicode_AsWideCharString(os2, NULL);
if (ws2 == NULL)
goto done;
/* Collate the strings. */
result = PyLong_FromLong(wcscoll(ws1, ws2));
done:
/* Deallocate everything. */
if (ws1) PyMem_FREE(ws1);
if (ws2) PyMem_FREE(ws2);
return result;
}
#endif
#ifdef HAVE_WCSXFRM
PyDoc_STRVAR(strxfrm__doc__,
"strxfrm(string) -> string.\n\
\n\
Return a string that can be used as a key for locale-aware comparisons.");
static PyObject*
PyLocale_strxfrm(PyObject* self, PyObject* args)
{
PyObject *str;
Py_ssize_t n1;
wchar_t *s = NULL, *buf = NULL;
size_t n2;
PyObject *result = NULL;
if (!PyArg_ParseTuple(args, "U:strxfrm", &str))
return NULL;
s = PyUnicode_AsWideCharString(str, &n1);
if (s == NULL)
goto exit;
if (wcslen(s) != (size_t)n1) {
PyErr_SetString(PyExc_ValueError,
"embedded null character");
goto exit;
}
/* assume no change in size, first */
n1 = n1 + 1;
buf = PyMem_New(wchar_t, n1);
if (!buf) {
PyErr_NoMemory();
goto exit;
}
errno = 0;
n2 = wcsxfrm(buf, s, n1);
if (errno && errno != ERANGE) {
PyErr_SetFromErrno(PyExc_OSError);
goto exit;
}
if (n2 >= (size_t)n1) {
/* more space needed */
wchar_t * new_buf = PyMem_Realloc(buf, (n2+1)*sizeof(wchar_t));
if (!new_buf) {
PyErr_NoMemory();
goto exit;
}
buf = new_buf;
errno = 0;
n2 = wcsxfrm(buf, s, n2+1);
if (errno) {
PyErr_SetFromErrno(PyExc_OSError);
goto exit;
}
}
result = PyUnicode_FromWideChar(buf, n2);
exit:
PyMem_Free(buf);
PyMem_Free(s);
return result;
}
#endif
#if defined(MS_WINDOWS)
static PyObject*
PyLocale_getdefaultlocale(PyObject* self)
{
char encoding[100];
char locale[100];
PyOS_snprintf(encoding, sizeof(encoding), "cp%d", GetACP());
if (GetLocaleInfo(LOCALE_USER_DEFAULT,
LOCALE_SISO639LANGNAME,
locale, sizeof(locale))) {
Py_ssize_t i = strlen(locale);
locale[i++] = '_';
if (GetLocaleInfo(LOCALE_USER_DEFAULT,
LOCALE_SISO3166CTRYNAME,
locale+i, (int)(sizeof(locale)-i)))
return Py_BuildValue("ss", locale, encoding);
}
/* If we end up here, this windows version didn't know about
ISO639/ISO3166 names (it's probably Windows 95). Return the
Windows language identifier instead (a hexadecimal number) */
locale[0] = '0';
locale[1] = 'x';
if (GetLocaleInfo(LOCALE_USER_DEFAULT, LOCALE_IDEFAULTLANGUAGE,
locale+2, sizeof(locale)-2)) {
return Py_BuildValue("ss", locale, encoding);
}
/* cannot determine the language code (very unlikely) */
Py_INCREF(Py_None);
return Py_BuildValue("Os", Py_None, encoding);
}
#endif
#ifdef HAVE_LANGINFO_H
#define LANGINFO(X) {#X, X}
static struct langinfo_constant{
char* name;
int value;
} langinfo_constants[] =
{
/* These constants should exist on any langinfo implementation */
LANGINFO(DAY_1),
LANGINFO(DAY_2),
LANGINFO(DAY_3),
LANGINFO(DAY_4),
LANGINFO(DAY_5),
LANGINFO(DAY_6),
LANGINFO(DAY_7),
LANGINFO(ABDAY_1),
LANGINFO(ABDAY_2),
LANGINFO(ABDAY_3),
LANGINFO(ABDAY_4),
LANGINFO(ABDAY_5),
LANGINFO(ABDAY_6),
LANGINFO(ABDAY_7),
LANGINFO(MON_1),
LANGINFO(MON_2),
LANGINFO(MON_3),
LANGINFO(MON_4),
LANGINFO(MON_5),
LANGINFO(MON_6),
LANGINFO(MON_7),
LANGINFO(MON_8),
LANGINFO(MON_9),
LANGINFO(MON_10),
LANGINFO(MON_11),
LANGINFO(MON_12),
LANGINFO(ABMON_1),
LANGINFO(ABMON_2),
LANGINFO(ABMON_3),
LANGINFO(ABMON_4),
LANGINFO(ABMON_5),
LANGINFO(ABMON_6),
LANGINFO(ABMON_7),
LANGINFO(ABMON_8),
LANGINFO(ABMON_9),
LANGINFO(ABMON_10),
LANGINFO(ABMON_11),
LANGINFO(ABMON_12),
#ifdef RADIXCHAR
/* The following are not available with glibc 2.0 */
LANGINFO(RADIXCHAR),
LANGINFO(THOUSEP),
/* YESSTR and NOSTR are deprecated in glibc, since they are
a special case of message translation, which should be rather
done using gettext. So we don't expose it to Python in the
first place.
LANGINFO(YESSTR),
LANGINFO(NOSTR),
*/
LANGINFO(CRNCYSTR),
#endif
LANGINFO(D_T_FMT),
LANGINFO(D_FMT),
LANGINFO(T_FMT),
LANGINFO(AM_STR),
LANGINFO(PM_STR),
/* The following constants are available only with XPG4, but...
AIX 3.2. only has CODESET.
OpenBSD doesn't have CODESET but has T_FMT_AMPM, and doesn't have
a few of the others.
Solution: ifdef-test them all. */
#ifdef CODESET
LANGINFO(CODESET),
#endif
#ifdef T_FMT_AMPM
LANGINFO(T_FMT_AMPM),
#endif
#ifdef ERA
LANGINFO(ERA),
#endif
#ifdef ERA_D_FMT
LANGINFO(ERA_D_FMT),
#endif
#ifdef ERA_D_T_FMT
LANGINFO(ERA_D_T_FMT),
#endif
#ifdef ERA_T_FMT
LANGINFO(ERA_T_FMT),
#endif
#ifdef ALT_DIGITS
LANGINFO(ALT_DIGITS),
#endif
#ifdef YESEXPR
LANGINFO(YESEXPR),
#endif
#ifdef NOEXPR
LANGINFO(NOEXPR),
#endif
#ifdef _DATE_FMT
/* This is not available in all glibc versions that have CODESET. */
LANGINFO(_DATE_FMT),
#endif
{0, 0}
};
PyDoc_STRVAR(nl_langinfo__doc__,
"nl_langinfo(key) -> string\n"
"Return the value for the locale information associated with key.");
static PyObject*
PyLocale_nl_langinfo(PyObject* self, PyObject* args)
{
int item, i;
if (!PyArg_ParseTuple(args, "i:nl_langinfo", &item))
return NULL;
/* Check whether this is a supported constant. GNU libc sometimes
returns numeric values in the char* return value, which would
crash PyUnicode_FromString. */
for (i = 0; langinfo_constants[i].name; i++)
if (langinfo_constants[i].value == item) {
/* Check NULL as a workaround for GNU libc's returning NULL
instead of an empty string for nl_langinfo(ERA). */
const char *result = nl_langinfo(item);
result = result != NULL ? result : "";
return PyUnicode_DecodeLocale(result, NULL);
}
PyErr_SetString(PyExc_ValueError, "unsupported langinfo constant");
return NULL;
}
#endif /* HAVE_LANGINFO_H */
#ifdef HAVE_LIBINTL_H
PyDoc_STRVAR(gettext__doc__,
"gettext(msg) -> string\n"
"Return translation of msg.");
static PyObject*
PyIntl_gettext(PyObject* self, PyObject *args)
{
char *in;
if (!PyArg_ParseTuple(args, "s", &in))
return 0;
return PyUnicode_DecodeLocale(gettext(in), NULL);
}
PyDoc_STRVAR(dgettext__doc__,
"dgettext(domain, msg) -> string\n"
"Return translation of msg in domain.");
static PyObject*
PyIntl_dgettext(PyObject* self, PyObject *args)
{
char *domain, *in;
if (!PyArg_ParseTuple(args, "zs", &domain, &in))
return 0;
return PyUnicode_DecodeLocale(dgettext(domain, in), NULL);
}
PyDoc_STRVAR(dcgettext__doc__,
"dcgettext(domain, msg, category) -> string\n"
"Return translation of msg in domain and category.");
static PyObject*
PyIntl_dcgettext(PyObject *self, PyObject *args)
{
char *domain, *msgid;
int category;
if (!PyArg_ParseTuple(args, "zsi", &domain, &msgid, &category))
return 0;
return PyUnicode_DecodeLocale(dcgettext(domain,msgid,category), NULL);
}
PyDoc_STRVAR(textdomain__doc__,
"textdomain(domain) -> string\n"
"Set the C library's textdmain to domain, returning the new domain.");
static PyObject*
PyIntl_textdomain(PyObject* self, PyObject* args)
{
char *domain;
if (!PyArg_ParseTuple(args, "z", &domain))
return 0;
domain = textdomain(domain);
if (!domain) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
return PyUnicode_DecodeLocale(domain, NULL);
}
PyDoc_STRVAR(bindtextdomain__doc__,
"bindtextdomain(domain, dir) -> string\n"
"Bind the C library's domain to dir.");
static PyObject*
PyIntl_bindtextdomain(PyObject* self,PyObject*args)
{
char *domain, *dirname, *current_dirname;
PyObject *dirname_obj, *dirname_bytes = NULL, *result;
if (!PyArg_ParseTuple(args, "sO", &domain, &dirname_obj))
return 0;
if (!strlen(domain)) {
PyErr_SetString(Error, "domain must be a non-empty string");
return 0;
}
if (dirname_obj != Py_None) {
if (!PyUnicode_FSConverter(dirname_obj, &dirname_bytes))
return NULL;
dirname = PyBytes_AsString(dirname_bytes);
} else {
dirname_bytes = NULL;
dirname = NULL;
}
current_dirname = bindtextdomain(domain, dirname);
if (current_dirname == NULL) {
Py_XDECREF(dirname_bytes);
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
result = PyUnicode_DecodeLocale(current_dirname, NULL);
Py_XDECREF(dirname_bytes);
return result;
}
#ifdef HAVE_BIND_TEXTDOMAIN_CODESET
PyDoc_STRVAR(bind_textdomain_codeset__doc__,
"bind_textdomain_codeset(domain, codeset) -> string\n"
"Bind the C library's domain to codeset.");
static PyObject*
PyIntl_bind_textdomain_codeset(PyObject* self,PyObject*args)
{
char *domain,*codeset;
if (!PyArg_ParseTuple(args, "sz", &domain, &codeset))
return NULL;
codeset = bind_textdomain_codeset(domain, codeset);
if (codeset)
return PyUnicode_DecodeLocale(codeset, NULL);
Py_RETURN_NONE;
}
#endif
#endif
static struct PyMethodDef PyLocale_Methods[] = {
{"setlocale", (PyCFunction) PyLocale_setlocale,
METH_VARARGS, setlocale__doc__},
{"localeconv", (PyCFunction) PyLocale_localeconv,
METH_NOARGS, localeconv__doc__},
#ifdef HAVE_WCSCOLL
{"strcoll", (PyCFunction) PyLocale_strcoll,
METH_VARARGS, strcoll__doc__},
#endif
#ifdef HAVE_WCSXFRM
{"strxfrm", (PyCFunction) PyLocale_strxfrm,
METH_VARARGS, strxfrm__doc__},
#endif
#if defined(MS_WINDOWS)
{"_getdefaultlocale", (PyCFunction) PyLocale_getdefaultlocale, METH_NOARGS},
#endif
#ifdef HAVE_LANGINFO_H
{"nl_langinfo", (PyCFunction) PyLocale_nl_langinfo,
METH_VARARGS, nl_langinfo__doc__},
#endif
#ifdef HAVE_LIBINTL_H
{"gettext",(PyCFunction)PyIntl_gettext,METH_VARARGS,
gettext__doc__},
{"dgettext",(PyCFunction)PyIntl_dgettext,METH_VARARGS,
dgettext__doc__},
{"dcgettext",(PyCFunction)PyIntl_dcgettext,METH_VARARGS,
dcgettext__doc__},
{"textdomain",(PyCFunction)PyIntl_textdomain,METH_VARARGS,
textdomain__doc__},
{"bindtextdomain",(PyCFunction)PyIntl_bindtextdomain,METH_VARARGS,
bindtextdomain__doc__},
#ifdef HAVE_BIND_TEXTDOMAIN_CODESET
{"bind_textdomain_codeset",(PyCFunction)PyIntl_bind_textdomain_codeset,
METH_VARARGS, bind_textdomain_codeset__doc__},
#endif
#endif
{NULL, NULL}
};
static struct PyModuleDef _localemodule = {
PyModuleDef_HEAD_INIT,
"_locale",
locale__doc__,
-1,
PyLocale_Methods,
NULL,
NULL,
NULL,
NULL
};
PyMODINIT_FUNC
PyInit__locale(void)
{
PyObject *m;
#ifdef HAVE_LANGINFO_H
int i;
#endif
m = PyModule_Create(&_localemodule);
if (m == NULL)
return NULL;
PyModule_AddIntMacro(m, LC_CTYPE);
PyModule_AddIntMacro(m, LC_TIME);
PyModule_AddIntMacro(m, LC_COLLATE);
PyModule_AddIntMacro(m, LC_MONETARY);
#ifdef LC_MESSAGES
PyModule_AddIntMacro(m, LC_MESSAGES);
#endif /* LC_MESSAGES */
PyModule_AddIntMacro(m, LC_NUMERIC);
PyModule_AddIntMacro(m, LC_ALL);
PyModule_AddIntMacro(m, CHAR_MAX);
Error = PyErr_NewException("locale.Error", NULL, NULL);
if (Error == NULL) {
Py_DECREF(m);
return NULL;
}
PyModule_AddObject(m, "Error", Error);
#ifdef HAVE_LANGINFO_H
for (i = 0; langinfo_constants[i].name; i++) {
PyModule_AddIntConstant(m, langinfo_constants[i].name,
langinfo_constants[i].value);
}
#endif
if (PyErr_Occurred()) {
Py_DECREF(m);
return NULL;
}
return m;
}
/*
Local variables:
c-basic-offset: 4
indent-tabs-mode: nil
End:
*/
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