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/*
* Copyright (C) 2010-2022 Free Software Foundation, Inc.
* Copyright (C) 2022 Red Hat, Inc.
*
* Author: Daiki Ueno
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>
*
*/
#include "config.h"
#include "pathbuf.h"
#include "gnutls_int.h"
#include <limits.h>
#include "intprops.h"
static int pathbuf_reserve(struct gnutls_pathbuf_st *buffer, size_t to_add)
{
size_t len;
char *ptr;
len = buffer->len;
if (INT_ADD_OVERFLOW(len, to_add)) {
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
len += to_add;
/* NUL terminator. */
if (INT_ADD_OVERFLOW(len, 1)) {
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
len++;
if (len <= buffer->cap) {
return 0;
}
if (buffer->ptr == buffer->base) {
ptr = gnutls_strdup(buffer->ptr);
if (!ptr) {
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
}
buffer->ptr = ptr;
}
ptr = gnutls_realloc(buffer->ptr, len);
if (!ptr) {
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
}
buffer->ptr = ptr;
buffer->cap = len;
return 0;
}
int _gnutls_pathbuf_init(struct gnutls_pathbuf_st *buffer, const char *base)
{
size_t len;
int ret;
memset(buffer, 0, sizeof(*buffer));
buffer->cap = sizeof(buffer->base);
buffer->ptr = buffer->base;
len = strlen(base);
ret = pathbuf_reserve(buffer, len);
if (ret < 0) {
return ret;
}
strcpy(buffer->ptr, base);
buffer->len = len;
return 0;
}
int _gnutls_pathbuf_append(struct gnutls_pathbuf_st *buffer,
const char *component)
{
size_t len;
char *p;
int ret;
len = strlen(component);
/* Path separator. */
if (INT_ADD_OVERFLOW(len, 1)) {
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
len++;
ret = pathbuf_reserve(buffer, len);
if (ret < 0) {
return ret;
}
p = stpcpy(&buffer->ptr[buffer->len], "/");
strcpy(p, component);
/* Overflow is already checked in the call to pathbuf_reserve
* above.
*/
buffer->len += len;
return 0;
}
int _gnutls_pathbuf_truncate(struct gnutls_pathbuf_st *buffer, size_t len)
{
if (len > buffer->len) {
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
buffer->len = len;
buffer->ptr[len] = '\0';
return 0;
}
void _gnutls_pathbuf_deinit(struct gnutls_pathbuf_st *buffer)
{
if (buffer->ptr != buffer->base) {
gnutls_free(buffer->ptr);
}
memset(buffer, 0, sizeof(*buffer));
}
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