/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr.h"
#include "apr_private.h"
#include "apr_arch_file_io.h"
#include "apr_file_io.h"
#include "apr_strings.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
/* Win32 malpropism that can go away once everyone believes this
* code is golden, and I'm not testing it anymore :-)
*/
#if APR_HAVE_DIRENT_H
#include <dirent.h>
#endif
/* Any OS that requires/refuses trailing slashes should be dealt with here.
*/
APR_DECLARE(apr_status_t) apr_filepath_get(char **defpath, apr_int32_t flags,
apr_pool_t *p)
{
char path[APR_PATH_MAX];
if (!getcwd(path, sizeof(path))) {
if (errno == ERANGE)
return APR_ENAMETOOLONG;
else
return errno;
}
*defpath = apr_pstrdup(p, path);
return APR_SUCCESS;
}
/* Any OS that requires/refuses trailing slashes should be dealt with here
*/
APR_DECLARE(apr_status_t) apr_filepath_set(const char *path, apr_pool_t *p)
{
if (chdir(path) != 0)
return errno;
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_filepath_root(const char **rootpath,
const char **inpath,
apr_int32_t flags,
apr_pool_t *p)
{
if (**inpath == '/') {
*rootpath = apr_pstrdup(p, "/");
do {
++(*inpath);
} while (**inpath == '/');
return APR_SUCCESS;
}
return APR_ERELATIVE;
}
APR_DECLARE(apr_status_t) apr_filepath_merge(char **newpath,
const char *rootpath,
const char *addpath,
apr_int32_t flags,
apr_pool_t *p)
{
char *path;
apr_size_t rootlen; /* is the length of the src rootpath */
apr_size_t maxlen; /* maximum total path length */
apr_size_t keptlen; /* is the length of the retained rootpath */
apr_size_t pathlen; /* is the length of the result path */
apr_size_t seglen; /* is the end of the current segment */
apr_status_t rv;
/* Treat null as an empty path.
*/
if (!addpath)
addpath = "";
if (addpath[0] == '/') {
/* If addpath is rooted, then rootpath is unused.
* Ths violates any APR_FILEPATH_SECUREROOTTEST and
* APR_FILEPATH_NOTABSOLUTE flags specified.
*/
if (flags & APR_FILEPATH_SECUREROOTTEST)
return APR_EABOVEROOT;
if (flags & APR_FILEPATH_NOTABSOLUTE)
return APR_EABSOLUTE;
/* If APR_FILEPATH_NOTABOVEROOT wasn't specified,
* we won't test the root again, it's ignored.
* Waste no CPU retrieving the working path.
*/
if (!rootpath && !(flags & APR_FILEPATH_NOTABOVEROOT))
rootpath = "";
}
else {
/* If APR_FILEPATH_NOTABSOLUTE is specified, the caller
* requires a relative result. If the rootpath is
* ommitted, we do not retrieve the working path,
* if rootpath was supplied as absolute then fail.
*/
if (flags & APR_FILEPATH_NOTABSOLUTE) {
if (!rootpath)
rootpath = "";
else if (rootpath[0] == '/')
return APR_EABSOLUTE;
}
}
if (!rootpath) {
/* Start with the current working path. This is bass akwards,
* but required since the compiler (at least vc) doesn't like
* passing the address of a char const* for a char** arg.
*/
char *getpath;
rv = apr_filepath_get(&getpath, flags, p);
rootpath = getpath;
if (rv != APR_SUCCESS)
return errno;
/* XXX: Any kernel subject to goofy, uncanonical results
* must run the rootpath against the user's given flags.
* Simplest would be a recursive call to apr_filepath_merge
* with an empty (not null) rootpath and addpath of the cwd.
*/
}
rootlen = strlen(rootpath);
maxlen = rootlen + strlen(addpath) + 4; /* 4 for slashes at start, after
* root, and at end, plus trailing
* null */
if (maxlen > APR_PATH_MAX) {
return APR_ENAMETOOLONG;
}
path = (char *)apr_palloc(p, maxlen);
if (addpath[0] == '/') {
/* Ignore the given root path, strip off leading
* '/'s to a single leading '/' from the addpath,
* and leave addpath at the first non-'/' character.
*/
keptlen = 0;
while (addpath[0] == '/')
++addpath;
path[0] = '/';
pathlen = 1;
}
else {
/* If both paths are relative, fail early
*/
if (rootpath[0] != '/' && (flags & APR_FILEPATH_NOTRELATIVE))
return APR_ERELATIVE;
/* Base the result path on the rootpath
*/
keptlen = rootlen;
memcpy(path, rootpath, rootlen);
/* Always '/' terminate the given root path
*/
if (keptlen && path[keptlen - 1] != '/') {
path[keptlen++] = '/';
}
pathlen = keptlen;
}
while (*addpath) {
/* Parse each segment, find the closing '/'
*/
const char *next = addpath;
while (*next && (*next != '/')) {
++next;
}
seglen = next - addpath;
if (seglen == 0 || (seglen == 1 && addpath[0] == '.')) {
/* noop segment (/ or ./) so skip it
*/
}
else if (seglen == 2 && addpath[0] == '.' && addpath[1] == '.') {
/* backpath (../) */
if (pathlen == 1 && path[0] == '/') {
/* Attempt to move above root. Always die if the
* APR_FILEPATH_SECUREROOTTEST flag is specified.
*/
if (flags & APR_FILEPATH_SECUREROOTTEST) {
return APR_EABOVEROOT;
}
/* Otherwise this is simply a noop, above root is root.
* Flag that rootpath was entirely replaced.
*/
keptlen = 0;
}
else if (pathlen == 0
|| (pathlen == 3
&& !memcmp(path + pathlen - 3, "../", 3))
|| (pathlen > 3
&& !memcmp(path + pathlen - 4, "/../", 4))) {
/* Path is already backpathed or empty, if the
* APR_FILEPATH_SECUREROOTTEST.was given die now.
*/
if (flags & APR_FILEPATH_SECUREROOTTEST) {
return APR_EABOVEROOT;
}
/* Otherwise append another backpath, including
* trailing slash if present.
*/
memcpy(path + pathlen, "../", *next ? 3 : 2);
pathlen += *next ? 3 : 2;
}
else {
/* otherwise crop the prior segment
*/
do {
--pathlen;
} while (pathlen && path[pathlen - 1] != '/');
}
/* Now test if we are above where we started and back up
* the keptlen offset to reflect the added/altered path.
*/
if (pathlen < keptlen) {
if (flags & APR_FILEPATH_SECUREROOTTEST) {
return APR_EABOVEROOT;
}
keptlen = pathlen;
}
}
else {
/* An actual segment, append it to the destination path
*/
if (*next) {
seglen++;
}
memcpy(path + pathlen, addpath, seglen);
pathlen += seglen;
}
/* Skip over trailing slash to the next segment
*/
if (*next) {
++next;
}
addpath = next;
}
path[pathlen] = '\0';
/* keptlen will be the rootlen unless the addpath contained
* backpath elements. If so, and APR_FILEPATH_NOTABOVEROOT
* is specified (APR_FILEPATH_SECUREROOTTEST was caught above),
* compare the original root to assure the result path is
* still within given root path.
*/
if ((flags & APR_FILEPATH_NOTABOVEROOT) && keptlen < rootlen) {
if (strncmp(rootpath, path, rootlen)) {
return APR_EABOVEROOT;
}
if (rootpath[rootlen - 1] != '/'
&& path[rootlen] && path[rootlen] != '/') {
return APR_EABOVEROOT;
}
}
*newpath = path;
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_filepath_list_split(apr_array_header_t **pathelts,
const char *liststr,
apr_pool_t *p)
{
return apr_filepath_list_split_impl(pathelts, liststr, ':', p);
}
APR_DECLARE(apr_status_t) apr_filepath_list_merge(char **liststr,
apr_array_header_t *pathelts,
apr_pool_t *p)
{
return apr_filepath_list_merge_impl(liststr, pathelts, ':', p);
}
APR_DECLARE(apr_status_t) apr_filepath_encoding(int *style, apr_pool_t *p)
{
#if defined(DARWIN)
*style = APR_FILEPATH_ENCODING_UTF8;
#else
*style = APR_FILEPATH_ENCODING_LOCALE;
#endif
return APR_SUCCESS;
}