Add std_update_time option.

README.md

@@ -36,6 +36,7 @@ As of this time, I am not aware of any NIC manufacturers that will be able to of
 * `interface` => The interface for the XDP program to attach to.
 * `updatetime` => How often to update the config and filtering rules. Leaving this at 0 disables auto-updating.
 * `nostats` => If true, no accepted/blocked packet statistics will be displayed in `stdout`.
+* `stdout_update_time` => The amount of time in milliseconds to update `stdout` with counters. Default is set to `1000` (one second).
 
 ### Filters
 Config option `filters` is an array. Each filter includes the following options:

src/config.c

@@ -23,6 +23,7 @@ void setcfgdefaults(struct config *cfg)
     cfg->updatetime = 0;
     cfg->interface = "eth0";
     cfg->nostats = 0;
+    cfg->stdout_update_time = 1000;
 
     for (__u16 i = 0; i < MAX_FILTERS; i++)
     {
@@ -158,16 +159,18 @@ int readcfg(struct config *cfg)
     // Get auto update time.
     int updatetime;
 
-    if (!config_lookup_int(&conf, "updatetime", &updatetime))
+    if (config_lookup_int(&conf, "updatetime", &updatetime) == CONFIG_TRUE)
     {
-        fprintf(stderr, "Error from LibConfig when reading 'updatetime' setting - %s\n\n", config_error_text(&conf));
-        
-        config_destroy(&conf);
-
-        return 1;    
+        cfg->updatetime = updatetime;
     }
 
-    cfg->updatetime = updatetime;
+    // Get stdout update time.
+    int stdout_update_time;
+
+    if (config_lookup_int(&conf, "stdout_update_time", &stdout_update_time) == CONFIG_TRUE)
+    {
+        cfg->stdout_update_time = stdout_update_time;
+    }
 
     // Get no stats.
     int nostats;

src/config.h

@@ -9,6 +9,7 @@ struct config
     char *interface;
     __u16 updatetime;
     unsigned int nostats : 1;
+    int stdout_update_time;
     struct filter filters[MAX_FILTERS];
 };
 

src/xdpfw.c

@@ -322,9 +322,10 @@ int main(int argc, char *argv[])
     // Check for list option.
     if (cmd.list)
     {
-        fprintf(stdout, "Details:\n");
+        fprintf(stdout, "Current Settings:\n");
         fprintf(stdout, "Interface Name => %s\n", cfg.interface);
         fprintf(stdout, "Update Time => %d\n", cfg.updatetime);
+        fprintf(stdout, "Stdout Update Time => %d\n\n", cfg.stdout_update_time);
 
         for (uint16_t i = 0; i < MAX_FILTERS; i++)
         {

src/xdpfw_kern.c

@@ -611,7 +611,7 @@ int xdp_prog_main(struct xdp_md *ctx)
         // Before dropping, update the blacklist map.
         if (blocktime > 0)
         {
-            __u64 newTime = now + (blocktime * 1000000000);
+            __u64 newTime = now + (blocktime * NANO_TO_SEC);
             
             if (iph6)
             {