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[Core] Add new switch_rand() a compliant random number generator API. Add a unit-test.

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* [Core] Add new switch_rand() a compliant random number generator API. Add a unit-test.

* Fall back to rand() on unsupported platforms compile time.
This commit is contained in:
Andrey Volk
2024-06-06 21:05:33 +03:00
parent b84b7cbf71
commit c7e793c345
3 changed files with 83 additions and 0 deletions
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57
src/switch_utils.c
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@@ -4811,6 +4811,63 @@ done:
return status;
}
SWITCH_DECLARE(int) switch_rand(void)
{
uint32_t random_number = 0;
#ifdef WIN32
BCRYPT_ALG_HANDLE hAlgorithm = NULL;
NTSTATUS status = BCryptOpenAlgorithmProvider(&hAlgorithm, BCRYPT_RNG_ALGORITHM, NULL, 0);
if (!BCRYPT_SUCCESS(status)) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "BCryptOpenAlgorithmProvider failed with status %d\n", status);
return 1;
}
status = BCryptGenRandom(hAlgorithm, (PUCHAR)&random_number, sizeof(random_number), 0);
if (!BCRYPT_SUCCESS(status)) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "BCryptGenRandom failed with status %d\n", status);
return 1;
}
BCryptCloseAlgorithmProvider(hAlgorithm, 0);
/* Make sure we return from 0 to RAND_MAX */
return (random_number & 0x7FFF);
#elif defined(__unix__) || defined(__APPLE__)
int random_fd = open("/dev/urandom", O_RDONLY);
ssize_t result;
char error_msg[100];
if (random_fd == -1) {
strncpy(error_msg, strerror(errno), sizeof(error_msg) - 1);
error_msg[sizeof(error_msg) - 1] = '\0';
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "open failed: %s\n", error_msg);
return 1;
}
result = read(random_fd, &random_number, sizeof(random_number));
if (result < 0) {
strncpy(error_msg, strerror(errno), sizeof(error_msg) - 1);
error_msg[sizeof(error_msg) - 1] = '\0';
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "read failed: %s\n", error_msg);
return 1;
}
close(random_fd);
/* Make sure we return from 0 to RAND_MAX */
return (random_number & 0x7FFF);
#else
return rand();
#endif
}
/* For Emacs:
* Local Variables:
* mode:c