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/*
Unix SMB/CIFS implementation.
filename matching routine
Copyright (C) Andrew Tridgell 1992-2004
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 <http://www.gnu.org/licenses/>.
*/
/*
This module was originally based on fnmatch.c copyright by the Free
Software Foundation. It bears little (if any) resemblence to that
code now
*/
#include "includes.h"
static int null_match(const smb_ucs2_t *p)
{
for (;*p;p++) {
if (*p != UCS2_CHAR('*') &&
*p != UCS2_CHAR('<') &&
*p != UCS2_CHAR('"') &&
*p != UCS2_CHAR('>')) return -1;
}
return 0;
}
/*
the max_n structure is purely for efficiency, it doesn't contribute
to the matching algorithm except by ensuring that the algorithm does
not grow exponentially
*/
struct max_n {
const smb_ucs2_t *predot;
const smb_ucs2_t *postdot;
};
/*
p and n are the pattern and string being matched. The max_n array is
an optimisation only. The ldot pointer is NULL if the string does
not contain a '.', otherwise it points at the last dot in 'n'.
*/
static int ms_fnmatch_core(const smb_ucs2_t *p, const smb_ucs2_t *n,
struct max_n *max_n, const smb_ucs2_t *ldot,
bool is_case_sensitive)
{
smb_ucs2_t c;
int i;
while ((c = *p++)) {
switch (c) {
/* a '*' matches zero or more characters of any type */
case UCS2_CHAR('*'):
if (max_n->predot && max_n->predot <= n) {
return null_match(p);
}
for (i=0; n[i]; i++) {
if (ms_fnmatch_core(p, n+i, max_n+1, ldot, is_case_sensitive) == 0) {
return 0;
}
}
if (!max_n->predot || max_n->predot > n) max_n->predot = n;
return null_match(p);
/* a '<' matches zero or more characters of
any type, but stops matching at the last
'.' in the string. */
case UCS2_CHAR('<'):
if (max_n->predot && max_n->predot <= n) {
return null_match(p);
}
if (max_n->postdot && max_n->postdot <= n && n <= ldot) {
return -1;
}
for (i=0; n[i]; i++) {
if (ms_fnmatch_core(p, n+i, max_n+1, ldot, is_case_sensitive) == 0) return 0;
if (n+i == ldot) {
if (ms_fnmatch_core(p, n+i+1, max_n+1, ldot, is_case_sensitive) == 0) return 0;
if (!max_n->postdot || max_n->postdot > n) max_n->postdot = n;
return -1;
}
}
if (!max_n->predot || max_n->predot > n) max_n->predot = n;
return null_match(p);
/* a '?' matches any single character */
case UCS2_CHAR('?'):
if (! *n) {
return -1;
}
n++;
break;
/* a '?' matches any single character */
case UCS2_CHAR('>'):
if (n[0] == UCS2_CHAR('.')) {
if (! n[1] && null_match(p) == 0) {
return 0;
}
break;
}
if (! *n) return null_match(p);
n++;
break;
case UCS2_CHAR('"'):
if (*n == 0 && null_match(p) == 0) {
return 0;
}
if (*n != UCS2_CHAR('.')) return -1;
n++;
break;
default:
if (c != *n) {
if (is_case_sensitive) {
return -1;
}
if (toupper_w(c) != toupper_w(*n)) {
return -1;
}
}
n++;
break;
}
}
if (! *n) {
return 0;
}
return -1;
}
int ms_fnmatch(const char *pattern, const char *string, bool translate_pattern,
bool is_case_sensitive)
{
smb_ucs2_t *p = NULL;
smb_ucs2_t *s = NULL;
int ret, count, i;
struct max_n *max_n = NULL;
struct max_n *max_n_free = NULL;
struct max_n one_max_n;
size_t converted_size;
if (ISDOTDOT(string)) {
string = ".";
}
if (strpbrk(pattern, "<>*?\"") == NULL) {
/* this is not just an optimisation - it is essential
for LANMAN1 correctness */
if (is_case_sensitive) {
return strcmp(pattern, string);
} else {
return strcasecmp_m(pattern, string);
}
}
if (!push_ucs2_talloc(talloc_tos(), &p, pattern, &converted_size)) {
return -1;
}
if (!push_ucs2_talloc(talloc_tos(), &s, string, &converted_size)) {
TALLOC_FREE(p);
return -1;
}
if (translate_pattern) {
/*
for older negotiated protocols it is possible to
translate the pattern to produce a "new style"
pattern that exactly matches w2k behaviour
*/
for (i=0;p[i];i++) {
if (p[i] == UCS2_CHAR('?')) {
p[i] = UCS2_CHAR('>');
} else if (p[i] == UCS2_CHAR('.') &&
(p[i+1] == UCS2_CHAR('?') ||
p[i+1] == UCS2_CHAR('*') ||
p[i+1] == 0)) {
p[i] = UCS2_CHAR('"');
} else if (p[i] == UCS2_CHAR('*') && p[i+1] == UCS2_CHAR('.')) {
p[i] = UCS2_CHAR('<');
}
}
}
for (count=i=0;p[i];i++) {
if (p[i] == UCS2_CHAR('*') || p[i] == UCS2_CHAR('<')) count++;
}
if (count != 0) {
if (count == 1) {
/*
* We're doing this a LOT, so save the effort to allocate
*/
ZERO_STRUCT(one_max_n);
max_n = &one_max_n;
}
else {
max_n = SMB_CALLOC_ARRAY(struct max_n, count);
if (!max_n) {
TALLOC_FREE(p);
TALLOC_FREE(s);
return -1;
}
max_n_free = max_n;
}
}
ret = ms_fnmatch_core(p, s, max_n, strrchr_w(s, UCS2_CHAR('.')), is_case_sensitive);
SAFE_FREE(max_n_free);
TALLOC_FREE(p);
TALLOC_FREE(s);
return ret;
}
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