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From GitBox <...@apache.org>
Subject [GitHub] [incubator-nuttx] patacongo commented on a change in pull request #1054: net/conn: generate port base dynamically
Date Fri, 15 May 2020 12:55:53 GMT

patacongo commented on a change in pull request #1054:
URL: https://github.com/apache/incubator-nuttx/pull/1054#discussion_r425781926



##########
File path: net/tcp/tcp_conn.c
##########
@@ -263,6 +260,20 @@ static FAR struct tcp_conn_s *
 static int tcp_selectport(uint8_t domain, FAR const union ip_addr_u *ipaddr,
                           uint16_t portno)
 {
+  static uint16_t g_last_tcp_port;
+
+  /* Generate port base dynamically */
+
+  if (g_last_tcp_port == 0)
+    {
+      g_last_tcp_port = clock_systime_ticks() % 32000;
+
+      if (g_last_tcp_port < 4096)
+        {
+          g_last_tcp_port += 4096;
+        }
+    }
+

Review comment:
       You still verify that this port number is unique, right?  With this change there is
the real possibility that you could generate duplicate port numbers.  Logic must be included
to avoid that.
   
   




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