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/*
* Unix SMB/CIFS implementation.
* Samba utility functions
* Copyright (C) Andrew Tridgell 1992-1998
* Copyright (C) Jeremy Allison 2001-2007
* Copyright (C) Simo Sorce 2001
* Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
* Copyright (C) James Peach 2006
*
* 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/>.
*/
#include "replace.h"
#include <talloc.h>
#include "lib/util/samba_util.h"
#include "lib/util_path.h"
struct share_params;
#include "source3/param/param_proto.h"
/**
* @brief Returns an absolute path to a file concatenating the provided
* @a rootpath and @a basename
*
* @param name Filename, relative to @a rootpath
*
* @retval Pointer to a string containing the full path.
**/
static char *xx_path(const char *name, const char *rootpath)
{
char *fname = NULL;
fname = talloc_strdup(talloc_tos(), rootpath);
if (!fname) {
return NULL;
}
trim_string(fname,"","/");
if (!directory_create_or_exist(fname, 0755)) {
return NULL;
}
return talloc_asprintf_append(fname, "/%s", name);
}
/**
* @brief Returns an absolute path to a file in the Samba lock directory.
*
* @param name File to find, relative to LOCKDIR.
*
* @retval Pointer to a talloc'ed string containing the full path.
**/
char *lock_path(const char *name)
{
return xx_path(name, lp_lock_directory());
}
/**
* @brief Returns an absolute path to a file in the Samba state directory.
*
* @param name File to find, relative to STATEDIR.
*
* @retval Pointer to a talloc'ed string containing the full path.
**/
char *state_path(const char *name)
{
return xx_path(name, lp_state_directory());
}
/**
* @brief Returns an absolute path to a file in the Samba cache directory.
*
* @param name File to find, relative to CACHEDIR.
*
* @retval Pointer to a talloc'ed string containing the full path.
**/
char *cache_path(const char *name)
{
return xx_path(name, lp_cache_directory());
}
/**
* @brief Removes any invalid path components in an absolute POSIX path.
*
* @param ctx Talloc context to return string.
*
* @param abs_path Absolute path string to process.
*
* @retval Pointer to a talloc'ed string containing the absolute full path.
**/
char *canonicalize_absolute_path(TALLOC_CTX *ctx, const char *abs_path)
{
char *destname;
char *d;
const char *s = abs_path;
bool start_of_name_component = true;
/* Allocate for strlen + '\0' + possible leading '/' */
destname = (char *)talloc_size(ctx, strlen(abs_path) + 2);
if (destname == NULL) {
return NULL;
}
d = destname;
*d++ = '/'; /* Always start with root. */
while (*s) {
if (*s == '/') {
/* Eat multiple '/' */
while (*s == '/') {
s++;
}
if ((d > destname + 1) && (*s != '\0')) {
*d++ = '/';
}
start_of_name_component = true;
continue;
}
if (start_of_name_component) {
if ((s[0] == '.') && (s[1] == '.') &&
(s[2] == '/' || s[2] == '\0')) {
/* Uh oh - "/../" or "/..\0" ! */
/* Go past the .. leaving us on the / or '\0' */
s += 2;
/* If we just added a '/' - delete it */
if ((d > destname) && (*(d-1) == '/')) {
*(d-1) = '\0';
d--;
}
/*
* Are we at the start ?
* Can't go back further if so.
*/
if (d <= destname) {
*d++ = '/'; /* Can't delete root */
continue;
}
/* Go back one level... */
/*
* Decrement d first as d points to
* the *next* char to write into.
*/
for (d--; d > destname; d--) {
if (*d == '/') {
break;
}
}
/*
* Are we at the start ?
* Can't go back further if so.
*/
if (d <= destname) {
*d++ = '/'; /* Can't delete root */
continue;
}
/*
* We're still at the start of a name
* component, just the previous one.
*/
continue;
} else if ((s[0] == '.') &&
((s[1] == '\0') || s[1] == '/')) {
/*
* Component of pathname can't be "." only.
* Skip the '.' .
*/
if (s[1] == '/') {
s += 2;
} else {
s++;
}
continue;
}
}
if (!(*s & 0x80)) {
*d++ = *s++;
} else {
size_t siz;
/* Get the size of the next MB character. */
next_codepoint(s,&siz);
switch(siz) {
case 5:
*d++ = *s++;
/*fall through*/
case 4:
*d++ = *s++;
/*fall through*/
case 3:
*d++ = *s++;
/*fall through*/
case 2:
*d++ = *s++;
/*fall through*/
case 1:
*d++ = *s++;
break;
default:
break;
}
}
start_of_name_component = false;
}
*d = '\0';
/* And must not end in '/' */
if (d > destname + 1 && (*(d-1) == '/')) {
*(d-1) = '\0';
}
return destname;
}
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