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/*
* Copyright (C) 2002, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <gnutls_num.h>
#include <gnutls_str.h>
#include <stdarg.h>
/* These function are like strcat, strcpy. They only
* do bound checking (they shouldn't cause buffer overruns),
* and they always produce null terminated strings.
*
* They should be used only with null terminated strings.
*/
void
_gnutls_str_cat (char *dest, size_t dest_tot_size, const char *src)
{
size_t str_size = strlen (src);
size_t dest_size = strlen (dest);
if (dest_tot_size - dest_size > str_size)
{
strcat (dest, src);
}
else
{
if (dest_tot_size - dest_size > 0)
{
strncat (dest, src, (dest_tot_size - dest_size) - 1);
dest[dest_tot_size - 1] = 0;
}
}
}
void
_gnutls_str_cpy (char *dest, size_t dest_tot_size, const char *src)
{
size_t str_size = strlen (src);
if (dest_tot_size > str_size)
{
strcpy (dest, src);
}
else
{
if (dest_tot_size > 0)
{
strncpy (dest, src, (dest_tot_size) - 1);
dest[dest_tot_size - 1] = 0;
}
}
}
void
_gnutls_mem_cpy (char *dest, size_t dest_tot_size, const char *src,
size_t src_size)
{
if (dest_tot_size >= src_size)
{
memcpy (dest, src, src_size);
}
else
{
if (dest_tot_size > 0)
{
memcpy (dest, src, dest_tot_size);
}
}
}
void
_gnutls_string_init (gnutls_string * str,
gnutls_alloc_function alloc_func,
gnutls_realloc_function realloc_func,
gnutls_free_function free_func)
{
str->data = str->allocd = NULL;
str->max_length = 0;
str->length = 0;
str->alloc_func = alloc_func;
str->free_func = free_func;
str->realloc_func = realloc_func;
}
void
_gnutls_string_clear (gnutls_string * str)
{
if (str == NULL || str->allocd == NULL)
return;
str->free_func (str->allocd);
str->data = str->allocd = NULL;
str->max_length = 0;
str->length = 0;
}
#define MIN_CHUNK 256
int
_gnutls_string_append_data (gnutls_string * dest, const void *data,
size_t data_size)
{
size_t tot_len = data_size + dest->length;
if (dest->max_length >= tot_len)
{
size_t unused = MEMSUB (dest->data, dest->allocd);
if (dest->max_length - unused <= tot_len)
{
if (dest->length && dest->data)
memmove (dest->allocd, dest->data, dest->length);
dest->data = dest->allocd;
}
memmove (&dest->data[dest->length], data, data_size);
dest->length = tot_len;
return tot_len;
}
else
{
size_t unused = MEMSUB (dest->data, dest->allocd);
size_t new_len =
MAX (data_size, MIN_CHUNK) + MAX (dest->max_length, MIN_CHUNK);
dest->allocd = dest->realloc_func (dest->allocd, new_len);
if (dest->allocd == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
dest->max_length = new_len;
dest->data = dest->allocd + unused;
if (dest->length && dest->data)
memmove (dest->allocd, dest->data, dest->length);
dest->data = dest->allocd;
memcpy (&dest->data[dest->length], data, data_size);
dest->length = tot_len;
return tot_len;
}
}
int
_gnutls_string_resize (gnutls_string * dest, size_t new_size)
{
if (dest->max_length >= new_size)
{
size_t unused = MEMSUB (dest->data, dest->allocd);
if (dest->max_length - unused <= new_size)
{
if (dest->length && dest->data)
memmove (dest->allocd, dest->data, dest->length);
dest->data = dest->allocd;
}
return 0;
}
else
{
size_t unused = MEMSUB (dest->data, dest->allocd);
size_t alloc_len =
MAX (new_size, MIN_CHUNK) + MAX (dest->max_length, MIN_CHUNK);
dest->allocd = dest->realloc_func (dest->allocd, alloc_len);
if (dest->allocd == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
dest->max_length = alloc_len;
dest->data = dest->allocd + unused;
if (dest->length && dest->data)
memmove (dest->allocd, dest->data, dest->length);
dest->data = dest->allocd;
return 0;
}
}
int
_gnutls_string_append_str (gnutls_string * dest, const char *src)
{
return _gnutls_string_append_data (dest, src, strlen (src));
}
/* returns data from a string in a constant buffer.
* The data will NOT be valid if buffer is released or
* data are appended in the buffer.
*/
void
_gnutls_string_get_datum (gnutls_string * str, gnutls_datum_t * data,
size_t req_size)
{
if (str->length == 0)
{
data->data = NULL;
data->size = 0;
return;
}
if (req_size > str->length)
req_size = str->length;
data->data = str->data;
data->size = req_size;
str->data += req_size;
str->length -= req_size;
/* if string becomes empty start from begining */
if (str->length == 0)
{
str->data = str->allocd;
}
return;
}
/* returns data from a string in a constant buffer.
*/
void
_gnutls_string_get_data (gnutls_string * str, void *data, size_t * req_size)
{
gnutls_datum_t tdata;
_gnutls_string_get_datum (str, &tdata, *req_size);
*req_size = tdata.size;
memcpy (data, tdata.data, tdata.size);
return;
}
int
_gnutls_string_append_printf (gnutls_string * dest, const char *fmt, ...)
{
va_list args;
int len;
char *str;
va_start (args, fmt);
len = vasprintf (&str, fmt, args);
va_end (args);
if (len < 0 || !str)
return -1;
len = _gnutls_string_append_str (dest, str);
free (str);
return len;
}
/* Converts the given string (old) to hex. A buffer must be provided
* to hold the new hex string. The new string will be null terminated.
* If the buffer does not have enough space to hold the string, a
* truncated hex string is returned (always null terminated).
*/
char *
_gnutls_bin2hex (const void *_old, size_t oldlen,
char *buffer, size_t buffer_size)
{
unsigned int i, j;
const opaque *old = _old;
for (i = j = 0; i < oldlen && j + 2 < buffer_size; j += 2)
{
sprintf (&buffer[j], "%.2x", old[i]);
i++;
}
buffer[j] = '\0';
return buffer;
}
/**
* gnutls_hex2bin - convert hex string into binary buffer.
* @hex_data: string with data in hex format
* @hex_size: size of hex data
* @bin_data: output array with binary data
* @bin_size: when calling *@bin_size should hold size of @bin_data,
* on return will hold actual size of @bin_data.
*
* Convert a buffer with hex data to binary data.
*
* Returns: %GNUTLS_E_SUCCESS on success, otherwise an error.
*
* Since: 2.4.0
**/
int
gnutls_hex2bin (const char *hex_data,
size_t hex_size, char *bin_data, size_t * bin_size)
{
return _gnutls_hex2bin (hex_data, (int) hex_size, bin_data, bin_size);
}
int
_gnutls_hex2bin (const opaque * hex_data, int hex_size, opaque * bin_data,
size_t * bin_size)
{
int i, j;
opaque hex2_data[3];
unsigned long val;
/* FIXME: we don't handle whitespace.
*/
hex_size /= 2;
if (*bin_size < (size_t) hex_size)
{
gnutls_assert ();
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
for (i = j = 0; j < hex_size; i += 2, j++)
{
hex2_data[0] = hex_data[i];
hex2_data[1] = hex_data[i + 1];
hex2_data[2] = 0;
val = strtoul ((char *) hex2_data, NULL, 16);
if (val == ULONG_MAX)
{
gnutls_assert ();
return GNUTLS_E_SRP_PWD_PARSING_ERROR;
}
bin_data[j] = val;
}
return 0;
}
/* compare hostname against certificate, taking account of wildcards
* return 1 on success or 0 on error
*
* note: certnamesize is required as X509 certs can contain embedded NULs in
* the strings such as CN or subjectAltName
*/
int
_gnutls_hostname_compare (const char *certname,
size_t certnamesize, const char *hostname)
{
/* find the first different character */
for (; *certname && *hostname && toupper (*certname) == toupper (*hostname);
certname++, hostname++, certnamesize--)
;
/* the strings are the same */
if (certnamesize == 0 && *hostname == '\0')
return 1;
if (*certname == '*')
{
/* a wildcard certificate */
certname++;
certnamesize--;
while (1)
{
/* Use a recursive call to allow multiple wildcards */
if (_gnutls_hostname_compare (certname, certnamesize, hostname))
return 1;
/* wildcards are only allowed to match a single domain
component or component fragment */
if (*hostname == '\0' || *hostname == '.')
break;
hostname++;
}
return 0;
}
return 0;
}
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