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-rw-r--r--file_io/unix/filepath.c314
1 files changed, 314 insertions, 0 deletions
diff --git a/file_io/unix/filepath.c b/file_io/unix/filepath.c
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+/* 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;
+}