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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2013 Tox project.
*/
/*
* Miscellaneous functions and data structures for doing random things.
*/
#ifndef _POSIX_C_SOURCE
// For nanosleep().
#define _POSIX_C_SOURCE 200112L
#endif
#include "misc_tools.h"
#include <assert.h>
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sodium.h>
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
#include <windows.h>
#else
#include <time.h>
#endif
#include "../toxcore/ccompat.h"
#include "../toxcore/tox.h"
void c_sleep(uint32_t x)
{
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
Sleep(x);
#else
struct timespec req;
req.tv_sec = x / 1000;
req.tv_nsec = (long)x % 1000 * 1000 * 1000;
nanosleep(&req, nullptr);
#endif
}
// You are responsible for freeing the return value!
uint8_t *hex_string_to_bin(const char *hex_string)
{
// byte is represented by exactly 2 hex digits, so length of binary string
// is half of that of the hex one. only hex string with even length
// valid. the more proper implementation would be to check if strlen(hex_string)
// is odd and return error code if it is. we assume strlen is even. if it's not
// then the last byte just won't be written in 'ret'.
size_t i, len = strlen(hex_string) / 2;
uint8_t *ret = (uint8_t *)malloc(len);
const char *pos = hex_string;
if (ret == nullptr) {
return nullptr;
}
for (i = 0; i < len; ++i, pos += 2) {
unsigned int val;
sscanf(pos, "%02x", &val);
ret[i] = val;
}
return ret;
}
void to_hex(char *out, uint8_t *in, int size)
{
while (size--) {
if (*in >> 4 < 0xA) {
*out++ = '0' + (*in >> 4);
} else {
*out++ = 'A' + (*in >> 4) - 0xA;
}
if ((*in & 0xf) < 0xA) {
*out++ = '0' + (*in & 0xF);
} else {
*out++ = 'A' + (*in & 0xF) - 0xA;
}
in++;
}
}
/* Reimplementation of strncasecmp() function from strings.h, as strings.h is
* POSIX and not portable. Specifically it doesn't exist on MSVC.
*/
int tox_strncasecmp(const char *s1, const char *s2, size_t n)
{
while (n--) {
int c1 = tolower(*(s1++));
int c2 = tolower(*(s2++));
if (c1 == '\0' || c2 == '\0' || c1 != c2) {
return c1 - c2;
}
}
return 0;
}
int cmdline_parsefor_ipv46(int argc, char **argv, bool *ipv6enabled)
{
int argvoffset = 0, argi;
for (argi = 1; argi < argc; argi++) {
if (!tox_strncasecmp(argv[argi], "--ipv", 5)) {
if (argv[argi][5] && !argv[argi][6]) {
char c = argv[argi][5];
if (c == '4') {
*ipv6enabled = false;
} else if (c == '6') {
*ipv6enabled = true;
} else {
printf("Invalid argument: %s. Try --ipv4 or --ipv6!\n", argv[argi]);
return -1;
}
} else {
printf("Invalid argument: %s. Try --ipv4 or --ipv6!\n", argv[argi]);
return -1;
}
if (argvoffset != argi - 1) {
printf("Argument must come first: %s.\n", argv[argi]);
return -1;
}
argvoffset++;
}
}
return argvoffset;
}
static const char *test_rng_name(void)
{
return "test_rng";
}
static uint32_t rng_state;
static uint32_t test_rng_random(void)
{
rng_state = 2624534371 * rng_state + 1;
return rng_state;
}
static void test_rng_buf(void *const buf, const size_t size)
{
uint8_t *p = (uint8_t *)buf;
uint32_t r = 0;
for (size_t i = 0; i < size; i++) {
if ((i % 4) == 0) {
r = test_rng_random();
}
*p = (r >> ((i % 4) * 8)) & 0xff;
++p;
}
}
static uint32_t test_rng_uniform(const uint32_t upper_bound)
{
// XXX: Not uniform! But that's ok for testing purposes.
return test_rng_random() % upper_bound;
}
static void test_rng_stir(void) { }
static int test_rng_close(void)
{
return 0;
}
static randombytes_implementation test_rng = {
test_rng_name,
test_rng_random,
test_rng_stir,
test_rng_uniform,
test_rng_buf,
test_rng_close
};
/* Simple insecure PRNG for testing purposes */
int use_test_rng(uint32_t seed)
{
rng_state = seed;
return randombytes_set_implementation(&test_rng);
}
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