Fixed bug #1: Excessive send queue bug (corruption of the offset variable).

Low priority messages are not relayed if soft limit send queue is reached.

Signed-off-by: Jan Vidar Krey <janvidar@extatic.org>

src/hub.c

@@ -50,6 +50,13 @@ int hub_handle_message(struct user* u, const char* line, size_t length)
 				   so we ignore them. */
 				break;
 
+			case ADC_CMD_EMSG:
+			case ADC_CMD_DMSG:
+			case ADC_CMD_BMSG:
+			case ADC_CMD_FMSG:
+				ret = hub_handle_chat_message(u, cmd);
+				break;
+
 			case ADC_CMD_BSCH:
 			case ADC_CMD_DSCH:
 			case ADC_CMD_ESCH:
@@ -57,18 +64,13 @@ int hub_handle_message(struct user* u, const char* line, size_t length)
 			case ADC_CMD_DRES:
 			case ADC_CMD_DRCM:
 			case ADC_CMD_DCTM:
+				cmd->priority = -1;
 				if (u->hub->config->chat_only && u->credentials < cred_operator)
 				{
 					/* These below aren't allowed in chat only hubs */
 					break;
 				}
 			
-			case ADC_CMD_EMSG:
-			case ADC_CMD_DMSG:
-			case ADC_CMD_BMSG:
-			case ADC_CMD_FMSG:
-				ret = hub_handle_chat_message(u, cmd); break;
-			
 			default:
 				if (user_is_logged_in(u))
 				{

src/inf.c

@@ -769,6 +769,8 @@ int hub_handle_info(struct user* user, const struct adc_message* cmd_unmodified)
 	struct adc_message* cmd = adc_msg_copy(cmd_unmodified); /* FIXME: Have a small memory leak here! */
 	if (!cmd) return -1; /* OOM */
 
+	cmd->priority = 1;
+
 	hub_handle_info_common(user, cmd);
 
 	/* If user is logging in, perform more checks,

src/netevent.c

@@ -147,7 +147,6 @@ void net_on_read(int fd, short ev, void *arg)
 	}
 }
 
-#define DEBUG_SENDQ
 
 void net_on_write(int fd, short ev, void *arg)
 {
@@ -176,15 +175,17 @@ void net_on_write(int fd, short ev, void *arg)
 			if (ret == length)
 			{
 #ifdef DEBUG_SENDQ
-				hub_log(log_error, "SENDQ: sent=%d bytes/%d (all), send_queue_size=%d, offset=%d\n", ret, (int) msg->length, user->send_queue_size, user->send_queue_offset);
+				hub_log(log_error, "SENDQ: sent=%d bytes/%d (all), send_queue_size=%d, offset=%d", ret, (int) msg->length, user->send_queue_size, user->send_queue_offset);
 #endif
 				user->send_queue_size -= ret;
 				user->send_queue_offset = 0;
 			
+#ifdef DEBUG_SENDQ
 				if ((user->send_queue_size < 0) || (user->send_queue_offset < 0))
 				{
 					hub_log(log_error, "INVALID: send_queue_size=%d, send_queue_offset=%d", user->send_queue_size, user->send_queue_offset);
 				}
+#endif DEBUG_SENDQ
 			
 				list_remove(user->send_queue, msg);
 				
@@ -202,16 +203,17 @@ void net_on_write(int fd, short ev, void *arg)
 			else
 			{
 #ifdef DEBUG_SENDQ
-                                hub_log(log_error, "SENDQ: sent=%d bytes/%d (part), send_queue_size=%d, offset=%d\n", ret, (int) msg->length, user->send_queue_size, user->send_queue_offset);
+                                hub_log(log_error, "SENDQ: sent=%d bytes/%d (part), send_queue_size=%d, offset=%d", ret, (int) msg->length, user->send_queue_size, user->send_queue_offset);
 #endif
-
 				user->send_queue_size -= ret;
 				user->send_queue_offset += ret;
 				
+#ifdef DEBUG_SENDQ				
 				if ((user->send_queue_size < 0) || (user->send_queue_offset < 0) || (user->send_queue_offset > msg->length))
 				{
 					hub_log(log_error, "INVALID: send_queue_size=%d, send_queue_offset=%d", user->send_queue_size, user->send_queue_offset);
 				}
+#endif
 				break;
 			}
 		}

src/route.c

@@ -64,7 +64,9 @@ static void queue_command(struct user* user, struct adc_message* msg__, int offs
 	struct adc_message* msg = adc_msg_incref(msg__);
 	list_append(user->send_queue, msg);
 
-	hub_log(log_trace, "queue_command(), user=%p, msg=%p (%zu), offset=%d", user, msg, msg->references, offset);
+#ifdef DEBUG_SENDQ
+	hub_log(log_trace, "SENDQ: user=%p, msg=%p (%zu), offset=%d, length=%d, total_length=%d", user, msg, msg->references, offset, msg->length, user->send_queue_size);
+#endif
 	
 	if (offset > 0)
 	{
@@ -75,16 +77,25 @@ static void queue_command(struct user* user, struct adc_message* msg__, int offs
 	else
 	{
 		user->send_queue_size += msg->length;
-		user->send_queue_offset = 0;
 	}
 }
 
 // #define ALWAYS_QUEUE_MESSAGES
 static size_t get_max_send_queue(struct hub_info* hub)
 {
-	return MAX(hub->config->max_send_buffer, (hub->config->max_recv_buffer * hub_get_user_count(hub)));
+	/* TODO: More dynamic send queue limit, for instance:
+	 * return MAX(hub->config->max_send_buffer, (hub->config->max_recv_buffer * hub_get_user_count(hub)));
+	 */
+	return hub->config->max_send_buffer;
 }
 
+static size_t get_max_send_queue_soft(struct hub_info* hub)
+{
+	return hub->config->max_send_buffer_soft;
+}
+
+
+
 /*
  * @return 1 if send queue is OK.
  *         -1 if send queue is overflowed
@@ -98,6 +109,9 @@ static int check_send_queue(struct user* user, struct adc_message* msg)
 	if ((user->send_queue_size + msg->length) > get_max_send_queue(user->hub))      
 		return -1;
 
+	if (user->send_queue_size > get_max_send_queue_soft(user->hub) && msg->priority < 0)
+		return 0;
+
 	return 1;
 }