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/* Copyright (C) 2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(HAVE_EXPLICIT_BZERO)
#if defined(HAVE_BSD_STRING_H)
#include <bsd/string.h>
#endif
/* #include <string.h> is needed. */
#elif defined(HAVE_EXPLICIT_MEMSET)
/* #include <string.h> is needed. */
#elif defined(HAVE_GNUTLS_MEMSET)
#include <gnutls/gnutls.h>
#else
#define USE_CUSTOM_MEMSET
#endif
#include "contrib/string.h"
#include "contrib/ctype.h"
#include "contrib/tolower.h"
uint8_t *memdup(const uint8_t *data, size_t data_size)
{
uint8_t *result = (uint8_t *)malloc(data_size);
if (!result) {
return NULL;
}
return memcpy(result, data, data_size);
}
char *sprintf_alloc(const char *fmt, ...)
{
char *strp = NULL;
va_list ap;
va_start(ap, fmt);
int ret = vasprintf(&strp, fmt, ap);
va_end(ap);
if (ret < 0) {
return NULL;
}
return strp;
}
char *strcdup(const char *s1, const char *s2)
{
if (!s1 || !s2) {
return NULL;
}
size_t s1len = strlen(s1);
size_t s2len = strlen(s2);
size_t nlen = s1len + s2len + 1;
char* dst = malloc(nlen);
if (dst == NULL) {
return NULL;
}
memcpy(dst, s1, s1len);
memcpy(dst + s1len, s2, s2len + 1);
return dst;
}
char *strstrip(const char *str)
{
// leading white-spaces
const char *scan = str;
while (is_space(scan[0])) {
scan += 1;
}
// trailing white-spaces
size_t len = strlen(scan);
while (len > 0 && is_space(scan[len - 1])) {
len -= 1;
}
char *trimmed = malloc(len + 1);
if (!trimmed) {
return NULL;
}
memcpy(trimmed, scan, len);
trimmed[len] = '\0';
return trimmed;
}
void strtolower(char *str)
{
if (str == NULL) {
return;
}
for (char *it = str; *it != '\0'; ++it) {
*it = knot_tolower(*it);
}
}
int const_time_memcmp(const void *s1, const void *s2, size_t n)
{
volatile uint8_t equal = 0;
for (size_t i = 0; i < n; i++) {
equal |= ((uint8_t *)s1)[i] ^ ((uint8_t *)s2)[i];
}
return equal;
}
#if defined(USE_CUSTOM_MEMSET)
typedef void *(*memset_t)(void *, int, size_t);
static volatile memset_t volatile_memset = memset;
#endif
void *memzero(void *s, size_t n)
{
#if defined(HAVE_EXPLICIT_BZERO) /* In OpenBSD since 5.5. */
/* In FreeBSD since 11.0. */
/* In glibc since 2.25. */
/* In DragonFly BSD since 5.5. */
explicit_bzero(s, n);
return s;
#elif defined(HAVE_EXPLICIT_MEMSET) /* In NetBSD since 7.0. */
return explicit_memset(s, 0, n);
#elif defined(HAVE_GNUTLS_MEMSET) /* In GnuTLS since 3.4.0. */
gnutls_memset(s, 0, n);
return s;
#else /* Knot custom solution as a fallback. */
/* Warning: the use of the return value is *probably* needed
* so as to avoid the volatile_memset() to be optimized out.
*/
return volatile_memset(s, 0, n);
#endif
}
static const char BIN_TO_HEX[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
char *bin_to_hex(const uint8_t *bin, size_t bin_len)
{
if (bin == NULL) {
return NULL;
}
size_t hex_size = bin_len * 2;
char *hex = malloc(hex_size + 1);
if (hex == NULL) {
return NULL;
}
for (size_t i = 0; i < bin_len; i++) {
hex[2 * i] = BIN_TO_HEX[bin[i] >> 4];
hex[2 * i + 1] = BIN_TO_HEX[bin[i] & 0x0f];
}
hex[hex_size] = '\0';
return hex;
}
/*!
* Convert HEX character to numeric value (assumes valid input).
*/
static uint8_t hex_to_number(const char hex)
{
if (hex >= '0' && hex <= '9') {
return hex - '0';
} else if (hex >= 'a' && hex <= 'f') {
return hex - 'a' + 10;
} else {
assert(hex >= 'A' && hex <= 'F');
return hex - 'A' + 10;
}
}
uint8_t *hex_to_bin(const char *hex, size_t *out_len)
{
if (hex == NULL || out_len == NULL) {
return NULL;
}
size_t hex_len = strlen(hex);
if (hex_len % 2 != 0) {
return NULL;
}
size_t bin_len = hex_len / 2;
uint8_t *bin = malloc(bin_len + 1);
if (bin == NULL) {
return NULL;
}
for (size_t i = 0; i < bin_len; i++) {
if (!is_xdigit(hex[2 * i]) || !is_xdigit(hex[2 * i + 1])) {
free(bin);
return NULL;
}
uint8_t high = hex_to_number(hex[2 * i]);
uint8_t low = hex_to_number(hex[2 * i + 1]);
bin[i] = high << 4 | low;
}
*out_len = bin_len;
return bin;
}
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