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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 <assert.h>
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "url.h"
bool
check_request_path(char *path)
{
char p [PATH_MAX], resolved[PATH_MAX];
char *rp;
/* build absolute path from DATA_DIR */
if (strlcpy(p, DATA_DIR, sizeof(p)) >= sizeof(p))
return false;
if (strlcat(p, "/", sizeof(p)) >= sizeof(p))
return false;
if (strlcat(p, path, sizeof(p)) >= sizeof(p))
return false;
/* canonicalize the path */
rp = realpath(p, resolved);
if (rp == NULL)
return false;
/* path must start with DATA_DIR */
rp[PATH_MAX - 1] = '\0';
if (strstr(rp, DATA_DIR) != rp)
return false;
return true;
}
size_t
url_build(char *dst, size_t dst_size,...)
{
va_list path_list;
const char *path;
size_t w_size;
dst[0] = '\0';
w_size = 0;
va_start(path_list, dst_size);
while ((path = va_arg(path_list, char *)) != NULL) {
/* no more space in dst buffer */
if (w_size >= dst_size)
break;
if (path[0] == '\0')
continue;
if (path[0] == '.' && path[1] == '\0')
continue;
if (path[0] != '/' && dst[w_size - 1] != '/')
strlcat(dst, "/", dst_size);
w_size = strlcat(dst, path, dst_size);
}
va_end(path_list);
return w_size;
}
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