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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 <sys/types.h>
#include <assert.h>
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <kcgi.h>
#include <string.h>
#include "config.h"
#include "str.h"
#include "url.h"
bool
check_request_path(const char *path, const char *suffix)
{
char p [PATH_MAX], resolved[PATH_MAX];
char *rp, *data_dir;
data_dir = config_data_dir();
if (data_dir == NULL)
return false;
/* 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;
if (strlen(suffix) > 0) {
/* add suffix */
if (strlcat(p, ".", sizeof(p)) >= sizeof(p))
return false;
if (strlcat(p, suffix, 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;
}
char *
url_encode(const char *str)
{
char *result;
if ((result = khttp_urlencode(str)) == NULL)
return NULL;
str_replace(result, '+', ' ');
return result;
}
size_t
url_build(char *dst, size_t dst_sz,...)
{
va_list path_list;
char p [PATH_MAX];
char *encoded, *path, *slash;
size_t c_len, p_len, w_len;
dst[0] = '\0';
w_len = 0;
va_start(path_list, dst_sz);
while ((path = va_arg(path_list, char *)) != NULL) {
/* no more space in dst buffer */
if (w_len >= dst_sz) {
w_len = 0;
goto end;
}
if (path[0] == '\0')
continue;
if (path[0] == '.' && path[1] == '\0')
continue;
while (path[0] != '\0') {
/* no more space in dst buffer */
if (w_len >= dst_sz) {
w_len = 0;
goto end;
}
/* skip heading slashes */
slash = strchr(path, '/');
if (slash == path) {
path++;
continue;
}
/* copy string to encode into buffer
* if no slash found, copy everything, otherwise stop
* before the slash */
c_len = slash == NULL ? strlen(path) :
(size_t) (slash - path);
if (c_len >= PATH_MAX) {
w_len = 0;
goto end;
}
p_len = strlcpy(p, path, c_len + 1);
if (p_len < c_len) {
w_len = 0;
goto end;
}
/* encode string */
if ((encoded = url_encode(p)) == NULL) {
w_len = 0;
goto end;
}
/* append it to the path */
strlcat(dst, "/", dst_sz);
w_len = strlcat(dst, encoded, dst_sz);
free(encoded);
path += c_len;
}
}
end:
va_end(path_list);
return w_len;
}
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