introduced printf() specifiers for:

host_t (%H)
  identification_t (%D)
  chunk pointers (%B)
  memory pointer/length (%b)
added a signaling bus:
  receives event and debug messages, sends them to its listeners
  stream_logger, sys_logger, file_logger added, listen to bus
some other tweaks here and there

src/charon/sa/transactions/ike_auth.c

@@ -694,8 +694,8 @@ static status_t get_response(private_ike_auth_t *this, message_t *request,
 		if (this->policy == NULL)
 		{
 			this->logger->log(this->logger, AUDIT,
-							  "no acceptable policy for IDs %s - %s found, deleting IKE_SA", 
-							  my_id->get_string(my_id), other_id->get_string(other_id));
+							  "no acceptable policy for IDs %D - %D found, deleting IKE_SA", 
+							  my_id, other_id);
 			my_id->destroy(my_id);
 			other_id->destroy(other_id);
 			build_notify(AUTHENTICATION_FAILED, response, TRUE);
@@ -939,9 +939,8 @@ static status_t conclude(private_ike_auth_t *this, message_t *response,
 		{
 			other_id->destroy(other_id);
 			this->logger->log(this->logger, AUDIT,
-							  "other peer uses unacceptable ID (%s, excepted %s), deleting IKE_SA",
-							  other_id->get_string(other_id),
-							  configured_other_id->get_string(configured_other_id));
+							  "other peer uses unacceptable ID (%D, excepted %D), deleting IKE_SA",
+							  other_id, configured_other_id);
 			return DESTROY_ME;
 		}
 		/* update other ID. It was already set, but may contain wildcards */

src/charon/sa/transactions/ike_sa_init.c

@@ -570,8 +570,8 @@ static status_t get_response(private_ike_sa_init_t *this,
 		response->add_payload(response, (payload_t*)notify);
 		
 		this->logger->log(this->logger, AUDIT,
-						  "no connection for hosts %s...%s found, deleting IKE_SA",
-						  me->get_string(me), other->get_string(other));
+						  "no connection for hosts %H...%H found, deleting IKE_SA",
+						  me, other);
 		return DESTROY_ME;
 	}