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/*
* Copyright 2023, Vincent Douillet <vincent@vdouillet.fr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <dirent.h>
#include <kcgi.h>
#include <kcgihtml.h>
#include <stdbool.h>
#include <string.h>
#include "browse.h"
#include "config.h"
#include "error.h"
#include "http.h"
#include "url.h"
#define URL_LENGTH_MAX 8192
/*
* Checks that the path can be safely processed. Namely, it should not contain "..", which denotes an attempt to get out of the DATA_DIR root folder.
*/
static bool
check_request_path(char *path)
{
char *p_found;
p_found = strstr(path, "/..");
if (p_found != NULL)
return false;
p_found = strstr(path, "../");
return p_found == NULL;
}
/*
* file url = r->pname / r->pagename / r->path / file_name
*/
static size_t
build_browse_url(struct kreq * r, char *url, size_t url_size, const char *file)
{
char *page_name;
page_name = strlen(r->pagename) == 0 ? BROWSE_URL : r->pagename;
return url_build(url, url_size, 4, r->pname, page_name, r->path, file);
}
int
browse(struct kreq * r)
{
struct dirent *dir;
DIR *data_dir;
char *file_name;
size_t url_size;
char url[URL_LENGTH_MAX], current_dir[URL_LENGTH_MAX];
struct khtmlreq html;
/* check that the requested URL can be safely processed */
if (strlen(r->path) >= URL_LENGTH_MAX) {
http_open(r, KHTTP_414);
return VAULT_URI_ERROR;
}
if (!check_request_path(r->path)) {
http_open(r, KHTTP_400);
return VAULT_URI_ERROR;
}
/* list requested directory content */
url_size = url_build(current_dir, URL_LENGTH_MAX, 2, DATA_DIR, r->path);
if (url_size == 0) {
http_open(r, KHTTP_404);
return VAULT_IO_ERROR;
} else if (url_size >= URL_LENGTH_MAX) {
http_open(r, KHTTP_414);
return VAULT_URI_ERROR;
}
data_dir = opendir(current_dir);
if (NULL == data_dir) {
http_open(r, KHTTP_404);
return VAULT_IO_ERROR;
}
http_open(r, KHTTP_200);
if (KCGI_OK != khtml_open(&html, r, 0))
return VAULT_CGI_ERROR;
/* build basic html page */
khtml_elem(&html, KELEM_DOCTYPE);
khtml_elem(&html, KELEM_HEAD);
khtml_attr(&html, KELEM_META, KATTR_CHARSET, "utf-8", KATTR__MAX);
khtml_elem(&html, KELEM_HTML);
khtml_elem(&html, KELEM_BODY);
khtml_elem(&html, KELEM_P);
khtml_puts(&html, "/");
khtml_closeelem(&html, 1);
khtml_elem(&html, KELEM_UL);
while ((dir = readdir(data_dir)) != NULL) {
/* ignore special . and .. folders */
file_name = dir->d_name;
if (strcmp(".", file_name) == 0 || strcmp("..", file_name) == 0)
continue;
url_size = build_browse_url(r, url, URL_LENGTH_MAX, file_name);
if (url_size == 0 || url_size >= URL_LENGTH_MAX)
continue;
khtml_elem(&html, KELEM_LI);
khtml_attr(&html, KELEM_A, KATTR_HREF, url, KATTR__MAX);
khtml_puts(&html, dir->d_name);
khtml_closeelem(&html, 2);
}
khtml_close(&html);
closedir(data_dir);
return VAULT_SUCCESS;
}
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