Thread safe random functions. More...
Functions | |
void | ub_systemseed (unsigned int seed) |
Initialize the system randomness. | |
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 *state) |
Generate next random number from the state passed along. | |
void | ub_randfree (struct ub_randstate *state) |
Delete the random state. |
Thread safe random functions.
Similar to arc4random() with an explicit initialisation routine.
void ub_systemseed | ( | unsigned int | seed | ) |
Initialize the system randomness.
Obtains entropy from the system before a chroot or privilege makes it unavailable. You do not have to call this, otherwise ub_initstate does so.
seed,: | seed value to create state (if no good entropy is found). |
References log_err(), VERB_OPS, and verbose().
Referenced by daemon_init(), ub_arc4random_stir(), and ub_initstate().
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(), and ub_systemseed().
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 MAX_VALUE, ub_randstate::rc4, ub_randstate::rc4_ready, and ub_arc4random_stir().
Referenced by calc_next_probe(), 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().