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A new bif unique_id(prefix) that returns a string that's unique across

Browse source 
Bro instaces with high probablity.

"prefix" is a string that will be prepended to the returned ID.
This commit is contained in:
Robin Sommer 2011-06-07 17:28:20 -07:00
parent 4bdb94955d
commit 8266709e20
10 changed files with 96 additions and 59 deletions
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52
src/Conn.cc
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@ -216,56 +216,6 @@ Connection::~Connection()
--external_connections;
}
uint64 Connection::uid_counter = 0;
uint64 Connection::uid_instance = 0;
uint64 Connection::CalculateNextUID()
{
if ( uid_instance == 0 )
{
// This is the first time we need a UID.
if ( ! have_random_seed() )
{
// If we don't need deterministic output (as
// indicated by a set seed), we calculate the
// instance ID by hashing something likely to be
// globally unique.
struct {
char hostname[128];
struct timeval time;
pid_t pid;
int rnd;
} unique;
gethostname(unique.hostname, 128);
unique.hostname[sizeof(unique.hostname)-1] = '\0';
gettimeofday(&unique.time, 0);
unique.pid = getpid();
unique.rnd = bro_random();
uid_instance = HashKey::HashBytes(&unique, sizeof(unique));
++uid_instance; // Now it's larger than zero.
}
else
// Generate determistic UIDs.
uid_instance = 1;
}
// Now calculate the unique ID for this connection.
struct {
uint64 counter;
hash_t instance;
} key;
key.counter = ++uid_counter;
key.instance = uid_instance;
uint64_t h = HashKey::HashBytes(&key, sizeof(key));
return h;
}
void Connection::Done()
{
finished = 1;
@ -417,7 +367,7 @@ RecordVal* Connection::BuildConnVal()
conn_val->Assign(8, new StringVal("")); // history
if ( ! uid )
uid = CalculateNextUID();
uid = calculate_unique_id();
char tmp[20];
conn_val->Assign(9, new StringVal(uitoa_n(uid, tmp, sizeof(tmp), 62)));