385 lines
10 KiB
C
385 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Some of the source code in this file came from fs/cifs/cifs_unicode.c
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*
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* Copyright (c) International Business Machines Corp., 2000,2009
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* Modified by Steve French (sfrench@us.ibm.com)
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* Modified by Namjae Jeon (linkinjeon@kernel.org)
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#include "glob.h"
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#include "unicode.h"
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#include "uniupr.h"
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#include "smb_common.h"
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/*
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* smb_utf16_bytes() - how long will a string be after conversion?
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* @from: pointer to input string
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* @maxbytes: don't go past this many bytes of input string
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* @codepage: destination codepage
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*
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* Walk a utf16le string and return the number of bytes that the string will
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* be after being converted to the given charset, not including any null
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* termination required. Don't walk past maxbytes in the source buffer.
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*
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* Return: string length after conversion
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*/
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static int smb_utf16_bytes(const __le16 *from, int maxbytes,
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const struct nls_table *codepage)
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{
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int i;
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int charlen, outlen = 0;
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int maxwords = maxbytes / 2;
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char tmp[NLS_MAX_CHARSET_SIZE];
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__u16 ftmp;
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for (i = 0; i < maxwords; i++) {
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ftmp = get_unaligned_le16(&from[i]);
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if (ftmp == 0)
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break;
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charlen = codepage->uni2char(ftmp, tmp, NLS_MAX_CHARSET_SIZE);
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if (charlen > 0)
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outlen += charlen;
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else
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outlen++;
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}
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return outlen;
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}
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/*
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* cifs_mapchar() - convert a host-endian char to proper char in codepage
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* @target: where converted character should be copied
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* @src_char: 2 byte host-endian source character
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* @cp: codepage to which character should be converted
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* @mapchar: should character be mapped according to mapchars mount option?
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*
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* This function handles the conversion of a single character. It is the
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* responsibility of the caller to ensure that the target buffer is large
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* enough to hold the result of the conversion (at least NLS_MAX_CHARSET_SIZE).
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*
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* Return: string length after conversion
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*/
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static int
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cifs_mapchar(char *target, const __u16 src_char, const struct nls_table *cp,
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bool mapchar)
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{
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int len = 1;
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if (!mapchar)
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goto cp_convert;
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/*
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* BB: Cannot handle remapping UNI_SLASH until all the calls to
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* build_path_from_dentry are modified, as they use slash as
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* separator.
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*/
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switch (src_char) {
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case UNI_COLON:
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*target = ':';
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break;
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case UNI_ASTERISK:
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*target = '*';
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break;
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case UNI_QUESTION:
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*target = '?';
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break;
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case UNI_PIPE:
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*target = '|';
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break;
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case UNI_GRTRTHAN:
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*target = '>';
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break;
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case UNI_LESSTHAN:
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*target = '<';
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break;
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default:
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goto cp_convert;
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}
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out:
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return len;
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cp_convert:
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len = cp->uni2char(src_char, target, NLS_MAX_CHARSET_SIZE);
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if (len <= 0) {
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*target = '?';
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len = 1;
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}
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goto out;
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}
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/*
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* is_char_allowed() - check for valid character
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* @ch: input character to be checked
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*
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* Return: 1 if char is allowed, otherwise 0
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*/
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static inline int is_char_allowed(char *ch)
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{
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/* check for control chars, wildcards etc. */
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if (!(*ch & 0x80) &&
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(*ch <= 0x1f ||
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*ch == '?' || *ch == '"' || *ch == '<' ||
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*ch == '>' || *ch == '|'))
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return 0;
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return 1;
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}
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/*
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* smb_from_utf16() - convert utf16le string to local charset
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* @to: destination buffer
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* @from: source buffer
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* @tolen: destination buffer size (in bytes)
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* @fromlen: source buffer size (in bytes)
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* @codepage: codepage to which characters should be converted
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* @mapchar: should characters be remapped according to the mapchars option?
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*
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* Convert a little-endian utf16le string (as sent by the server) to a string
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* in the provided codepage. The tolen and fromlen parameters are to ensure
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* that the code doesn't walk off of the end of the buffer (which is always
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* a danger if the alignment of the source buffer is off). The destination
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* string is always properly null terminated and fits in the destination
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* buffer. Returns the length of the destination string in bytes (including
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* null terminator).
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*
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* Note that some windows versions actually send multiword UTF-16 characters
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* instead of straight UTF16-2. The linux nls routines however aren't able to
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* deal with those characters properly. In the event that we get some of
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* those characters, they won't be translated properly.
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*
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* Return: string length after conversion
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*/
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static int smb_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
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const struct nls_table *codepage, bool mapchar)
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{
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int i, charlen, safelen;
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int outlen = 0;
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int nullsize = nls_nullsize(codepage);
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int fromwords = fromlen / 2;
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char tmp[NLS_MAX_CHARSET_SIZE];
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__u16 ftmp;
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/*
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* because the chars can be of varying widths, we need to take care
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* not to overflow the destination buffer when we get close to the
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* end of it. Until we get to this offset, we don't need to check
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* for overflow however.
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*/
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safelen = tolen - (NLS_MAX_CHARSET_SIZE + nullsize);
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for (i = 0; i < fromwords; i++) {
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ftmp = get_unaligned_le16(&from[i]);
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if (ftmp == 0)
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break;
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/*
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* check to see if converting this character might make the
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* conversion bleed into the null terminator
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*/
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if (outlen >= safelen) {
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charlen = cifs_mapchar(tmp, ftmp, codepage, mapchar);
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if ((outlen + charlen) > (tolen - nullsize))
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break;
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}
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/* put converted char into 'to' buffer */
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charlen = cifs_mapchar(&to[outlen], ftmp, codepage, mapchar);
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outlen += charlen;
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}
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/* properly null-terminate string */
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for (i = 0; i < nullsize; i++)
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to[outlen++] = 0;
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return outlen;
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}
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/*
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* smb_strtoUTF16() - Convert character string to unicode string
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* @to: destination buffer
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* @from: source buffer
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* @len: destination buffer size (in bytes)
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* @codepage: codepage to which characters should be converted
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*
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* Return: string length after conversion
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*/
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int smb_strtoUTF16(__le16 *to, const char *from, int len,
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const struct nls_table *codepage)
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{
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int charlen;
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int i;
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wchar_t wchar_to; /* needed to quiet sparse */
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/* special case for utf8 to handle no plane0 chars */
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if (!strcmp(codepage->charset, "utf8")) {
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/*
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* convert utf8 -> utf16, we assume we have enough space
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* as caller should have assumed conversion does not overflow
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* in destination len is length in wchar_t units (16bits)
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*/
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i = utf8s_to_utf16s(from, len, UTF16_LITTLE_ENDIAN,
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(wchar_t *)to, len);
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/* if success terminate and exit */
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if (i >= 0)
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goto success;
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/*
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* if fails fall back to UCS encoding as this
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* function should not return negative values
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* currently can fail only if source contains
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* invalid encoded characters
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*/
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}
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for (i = 0; len > 0 && *from; i++, from += charlen, len -= charlen) {
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charlen = codepage->char2uni(from, len, &wchar_to);
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if (charlen < 1) {
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/* A question mark */
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wchar_to = 0x003f;
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charlen = 1;
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}
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put_unaligned_le16(wchar_to, &to[i]);
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}
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success:
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put_unaligned_le16(0, &to[i]);
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return i;
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}
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/*
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* smb_strndup_from_utf16() - copy a string from wire format to the local
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* codepage
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* @src: source string
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* @maxlen: don't walk past this many bytes in the source string
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* @is_unicode: is this a unicode string?
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* @codepage: destination codepage
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*
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* Take a string given by the server, convert it to the local codepage and
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* put it in a new buffer. Returns a pointer to the new string or NULL on
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* error.
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*
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* Return: destination string buffer or error ptr
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*/
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char *smb_strndup_from_utf16(const char *src, const int maxlen,
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const bool is_unicode,
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const struct nls_table *codepage)
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{
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int len, ret;
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char *dst;
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if (is_unicode) {
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len = smb_utf16_bytes((__le16 *)src, maxlen, codepage);
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len += nls_nullsize(codepage);
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dst = kmalloc(len, GFP_KERNEL);
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if (!dst)
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return ERR_PTR(-ENOMEM);
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ret = smb_from_utf16(dst, (__le16 *)src, len, maxlen, codepage,
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false);
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if (ret < 0) {
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kfree(dst);
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return ERR_PTR(-EINVAL);
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}
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} else {
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len = strnlen(src, maxlen);
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len++;
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dst = kmalloc(len, GFP_KERNEL);
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if (!dst)
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return ERR_PTR(-ENOMEM);
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strscpy(dst, src, len);
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}
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return dst;
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}
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/*
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* Convert 16 bit Unicode pathname to wire format from string in current code
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* page. Conversion may involve remapping up the six characters that are
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* only legal in POSIX-like OS (if they are present in the string). Path
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* names are little endian 16 bit Unicode on the wire
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*/
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/*
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* smbConvertToUTF16() - convert string from local charset to utf16
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* @target: destination buffer
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* @source: source buffer
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* @srclen: source buffer size (in bytes)
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* @cp: codepage to which characters should be converted
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* @mapchar: should characters be remapped according to the mapchars option?
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*
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* Convert 16 bit Unicode pathname to wire format from string in current code
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* page. Conversion may involve remapping up the six characters that are
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* only legal in POSIX-like OS (if they are present in the string). Path
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* names are little endian 16 bit Unicode on the wire
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*
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* Return: char length after conversion
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*/
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int smbConvertToUTF16(__le16 *target, const char *source, int srclen,
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const struct nls_table *cp, int mapchars)
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{
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int i, j, charlen;
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char src_char;
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__le16 dst_char;
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wchar_t tmp;
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if (!mapchars)
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return smb_strtoUTF16(target, source, srclen, cp);
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for (i = 0, j = 0; i < srclen; j++) {
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src_char = source[i];
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charlen = 1;
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switch (src_char) {
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case 0:
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put_unaligned(0, &target[j]);
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return j;
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case ':':
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dst_char = cpu_to_le16(UNI_COLON);
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break;
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case '*':
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dst_char = cpu_to_le16(UNI_ASTERISK);
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break;
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case '?':
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dst_char = cpu_to_le16(UNI_QUESTION);
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break;
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case '<':
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dst_char = cpu_to_le16(UNI_LESSTHAN);
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break;
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case '>':
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dst_char = cpu_to_le16(UNI_GRTRTHAN);
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break;
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case '|':
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dst_char = cpu_to_le16(UNI_PIPE);
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break;
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/*
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* FIXME: We can not handle remapping backslash (UNI_SLASH)
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* until all the calls to build_path_from_dentry are modified,
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* as they use backslash as separator.
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*/
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default:
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charlen = cp->char2uni(source + i, srclen - i, &tmp);
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dst_char = cpu_to_le16(tmp);
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/*
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* if no match, use question mark, which at least in
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* some cases serves as wild card
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*/
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if (charlen < 1) {
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dst_char = cpu_to_le16(0x003f);
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charlen = 1;
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}
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}
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/*
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* character may take more than one byte in the source string,
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* but will take exactly two bytes in the target string
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*/
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i += charlen;
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put_unaligned(dst_char, &target[j]);
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}
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return j;
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}
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