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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
*/
/**
* @file
* @brief MS-style Filename matching
*/
#include "includes.h"
static int null_match(const char *p)
{
for (;*p;p++) {
if (*p != '*' &&
*p != '<' &&
*p != '"' &&
*p != '>') 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 char *predot;
const char *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 char *p, const char *n,
struct max_n *max_n, const char *ldot)
{
codepoint_t c, c2;
int i;
size_t size, size_n;
while ((c = next_codepoint(p, &size))) {
p += size;
switch (c) {
case '*':
/* a '*' matches zero or more characters of any type */
if (max_n->predot && max_n->predot <= n) {
return null_match(p);
}
for (i=0; n[i]; i += size_n) {
next_codepoint(n+i, &size_n);
if (ms_fnmatch_core(p, n+i, max_n+1, ldot) == 0) {
return 0;
}
}
if (!max_n->predot || max_n->predot > n) max_n->predot = n;
return null_match(p);
case '<':
/* a '<' matches zero or more characters of
any type, but stops matching at the last
'.' in the string. */
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 += size_n) {
next_codepoint(n+i, &size_n);
if (ms_fnmatch_core(p, n+i, max_n+1, ldot) == 0) return 0;
if (n+i == ldot) {
if (ms_fnmatch_core(p, n+i+size_n, max_n+1, ldot) == 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);
case '?':
/* a '?' matches any single character */
if (! *n) {
return -1;
}
next_codepoint(n, &size_n);
n += size_n;
break;
case '>':
/* a '?' matches any single character, but
treats '.' specially */
if (n[0] == '.') {
if (! n[1] && null_match(p) == 0) {
return 0;
}
break;
}
if (! *n) return null_match(p);
next_codepoint(n, &size_n);
n += size_n;
break;
case '"':
/* a bit like a soft '.' */
if (*n == 0 && null_match(p) == 0) {
return 0;
}
if (*n != '.') return -1;
next_codepoint(n, &size_n);
n += size_n;
break;
default:
c2 = next_codepoint(n, &size_n);
if (c != c2 && codepoint_cmpi(c, c2) != 0) {
return -1;
}
n += size_n;
break;
}
}
if (! *n) {
return 0;
}
return -1;
}
int ms_fnmatch(const char *pattern, const char *string, enum protocol_types protocol)
{
int ret, count, i;
struct max_n *max_n = NULL;
if (strcmp(string, "..") == 0) {
string = ".";
}
if (strpbrk(pattern, "<>*?\"") == NULL) {
/* this is not just an optimisation - it is essential
for LANMAN1 correctness */
return strcasecmp_m(pattern, string);
}
if (protocol <= PROTOCOL_LANMAN2) {
char *p = talloc_strdup(NULL, pattern);
if (p == NULL) {
return -1;
}
/*
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] == '?') {
p[i] = '>';
} else if (p[i] == '.' &&
(p[i+1] == '?' ||
p[i+1] == '*' ||
p[i+1] == 0)) {
p[i] = '"';
} else if (p[i] == '*' &&
p[i+1] == '.') {
p[i] = '<';
}
}
ret = ms_fnmatch(p, string, PROTOCOL_NT1);
talloc_free(p);
return ret;
}
for (count=i=0;pattern[i];i++) {
if (pattern[i] == '*' || pattern[i] == '<') count++;
}
max_n = talloc_zero_array(NULL, struct max_n, count);
if (max_n == NULL) {
return -1;
}
ret = ms_fnmatch_core(pattern, string, max_n, strrchr(string, '.'));
talloc_free(max_n);
return ret;
}
/** a generic fnmatch function - uses for non-CIFS pattern matching */
int gen_fnmatch(const char *pattern, const char *string)
{
return ms_fnmatch(pattern, string, PROTOCOL_NT1);
}
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