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Add utility function to access first random seed.

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This commit is contained in:
Matthias Vallentin 2013-06-14 09:22:48 -07:00
parent a6d7b7856e
commit d2d8aff814
2 changed files with 18 additions and 0 deletions
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13
src/util.cc
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@ -716,6 +716,8 @@ static bool write_random_seeds(const char* write_file, uint32 seed,
static bool bro_rand_determistic = false; static bool bro_rand_determistic = false;
static unsigned int bro_rand_state = 0; static unsigned int bro_rand_state = 0;
static bool first_seed_saved = false;
static unsigned int first_seed = 0;
static void bro_srandom(unsigned int seed, bool deterministic) static void bro_srandom(unsigned int seed, bool deterministic)
{ {
@ -800,6 +802,12 @@ void init_random_seed(uint32 seed, const char* read_file, const char* write_file
bro_srandom(seed, seeds_done); bro_srandom(seed, seeds_done);
if ( ! first_seed_saved )
{
first_seed = seed;
first_seed_saved = true;
}
if ( ! hmac_key_set ) if ( ! hmac_key_set )
{ {
MD5((const u_char*) buf, sizeof(buf), shared_hmac_md5_key); MD5((const u_char*) buf, sizeof(buf), shared_hmac_md5_key);
@ -811,6 +819,11 @@ void init_random_seed(uint32 seed, const char* read_file, const char* write_file
write_file); write_file);
} }
unsigned int initial_seed()
{
return first_seed;
}
bool have_random_seed() bool have_random_seed()
{ {
return bro_rand_determistic; return bro_rand_determistic;

5
src/util.h
View file

@ -165,6 +165,11 @@ extern void hmac_md5(size_t size, const unsigned char* bytes,
extern void init_random_seed(uint32 seed, const char* load_file, extern void init_random_seed(uint32 seed, const char* load_file,
const char* write_file); const char* write_file);
// Retrieves the initial seed computed after the very first call to
// init_random_seed(). Repeated calls to init_random_seed() will not affect the
// return value of this function.
unsigned int initial_seed();
// Returns true if the user explicitly set a seed via init_random_seed(); // Returns true if the user explicitly set a seed via init_random_seed();
extern bool have_random_seed(); extern bool have_random_seed();