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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 loadparm_substitution;
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(TALLOC_CTX *mem_ctx,
const char *name,
const char *rootpath)
{
char *fname = NULL;
fname = talloc_strdup(mem_ctx, 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(TALLOC_CTX *mem_ctx, const char *name)
{
return xx_path(mem_ctx, 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(TALLOC_CTX *mem_ctx, const char *name)
{
return xx_path(mem_ctx, 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(TALLOC_CTX *mem_ctx, const char *name)
{
return xx_path(mem_ctx, 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 *pathname_in)
{
/*
* Note we use +2 here so if pathname_in=="" then we
* have space to return "/".
*/
char *pathname = talloc_array(ctx, char, strlen(pathname_in)+2);
const char *s = pathname_in;
char *p = pathname;
bool wrote_slash = false;
if (pathname == NULL) {
return NULL;
}
/* Always start with a '/'. */
*p++ = '/';
wrote_slash = true;
while (*s) {
/* Deal with '/' or multiples of '/'. */
if (s[0] == '/') {
while (s[0] == '/') {
/* Eat trailing '/' */
s++;
}
/* Update target with one '/' */
if (!wrote_slash) {
*p++ = '/';
wrote_slash = true;
}
continue;
}
if (wrote_slash) {
/* Deal with "./" or ".\0" */
if (s[0] == '.' &&
(s[1] == '/' || s[1] == '\0')) {
/* Eat the dot. */
s++;
while (s[0] == '/') {
/* Eat any trailing '/' */
s++;
}
/* Don't write anything to target. */
/* wrote_slash is still true. */
continue;
}
/* Deal with "../" or "..\0" */
if (s[0] == '.' && s[1] == '.' &&
(s[2] == '/' || s[2] == '\0')) {
/* Eat the dot dot. */
s += 2;
while (s[0] == '/') {
/* Eat any trailing '/' */
s++;
}
/*
* As wrote_slash is true, we go back
* one character to point p at the slash
* we just saw.
*/
if (p > pathname) {
p--;
}
/*
* Now go back to the slash
* before the one that p currently points to.
*/
while (p > pathname) {
p--;
if (p[0] == '/') {
break;
}
}
/*
* Step forward one to leave the
* last written '/' alone.
*/
p++;
/* Don't write anything to target. */
/* wrote_slash is still true. */
continue;
}
}
/* Non-separator character, just copy. */
*p++ = *s++;
wrote_slash = false;
}
if (wrote_slash) {
/*
* We finished on a '/'.
* Remove the trailing '/', but not if it's
* the sole character in the path.
*/
if (p > pathname + 1) {
p--;
}
}
/* Terminate and we're done ! */
*p++ = '\0';
return pathname;
}
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