Compact input buffer before trying to read instead of after.

Also log an error when the input buffer contains more than MAXBUFSIZE bytes
already, instead of silently claiming the other side closed the connection.

src/meta.c

@@ -85,6 +85,13 @@ bool receive_meta(connection_t *c) {
 	   - If not, keep stuff in buffer and exit.
 	 */
 
+	buffer_compact(&c->inbuf);
+
+	if(sizeof inbuf <= c->inbuf.len) {
+		logger(LOG_ERR, "Input buffer full for %s (%s)\n");
+		return false;
+	}
+
 	inlen = recv(c->socket, inbuf, sizeof inbuf - c->inbuf.len, 0);
 
 	if(inlen <= 0) {
@@ -151,7 +158,5 @@ bool receive_meta(connection_t *c) {
 		}
 	} while(inlen);
 
-	buffer_compact(&c->inbuf);
-
 	return true;
 }