#include "config.h"
#include "util/random.h"
#include "util/log.h"
#include <openssl/rand.h>
#include <openssl/rc4.h>
#include <openssl/err.h>
Data Structures | |
struct | ub_randstate |
Struct with per-thread random state. More... | |
Defines | |
#define | SEED_SIZE 20 |
Size of key to use. | |
#define | REKEY_BYTES (1 << 24) |
Number of bytes to reseed after. | |
Functions | |
static void | ub_arc4random_stir (struct ub_randstate *s, struct ub_randstate *from) |
reseed random generator | |
struct ub_randstate * | ub_initstate (unsigned int seed, struct ub_randstate *from) |
Initialize a random generator state for use. | |
long int | ub_random (struct ub_randstate *s) |
Generate next random number from the state passed along. | |
void | ub_randfree (struct ub_randstate *s) |
Delete the random state. |
Similar to arc4random() with an explicit initialisation routine.
The code in this file is based on arc4random from openssh-4.0p1/openbsd-compat/bsd-arc4random.c That code is also BSD licensed.
struct ub_randstate* ub_initstate | ( | unsigned int | seed, | |
struct ub_randstate * | from | |||
) | [read] |
Initialize a random generator state for use.
seed,: | seed value to create state contents. (ignored for arc4random). | |
from,: | if not NULL, the seed is taken from this random structure. can be used to seed random states via a parent-random-state that is itself seeded with entropy. |
References log_err(), ub_arc4random_stir(), VERB_OPS, and verbose().
Referenced by daemon_create_workers(), libworker_setup(), rnd_test(), ub_ctx_create(), and worker_init().
long int ub_random | ( | struct ub_randstate * | state | ) |
Generate next random number from the state passed along.
Thread safe, so random numbers are repeatable.
state,: | must have been initialised with ub_initstate. |
References ub_randstate::rc4, ub_randstate::rc4_ready, and ub_arc4random_stir().
Referenced by daemon_get_shufport(), iter_ns_probability(), iter_server_selection(), pending_tcp_query(), rnd_test(), select_id(), select_ifport(), serviced_perturb_qname(), and ub_arc4random_stir().
void ub_randfree | ( | struct ub_randstate * | state | ) |
Delete the random state.
state,: | to delete. |
Referenced by daemon_delete(), libworker_delete(), rnd_test(), ub_ctx_create(), ub_ctx_delete(), and worker_delete().