provide conntrack percentage values

diff --git a/src/conntrack.c b/src/conntrack.c
index 33236c4..52cc876 100644 (file)
--- a/src/conntrack.c
+++ b/src/conntrack.c
@@ -30,8 +30,10 @@
 #endif
 
 #define CONNTRACK_FILE "/proc/sys/net/netfilter/nf_conntrack_count"
+#define CONNTRACK_MAX_FILE "/proc/sys/net/netfilter/nf_conntrack_max"
 
-static void conntrack_submit (value_t conntrack)
+static void conntrack_submit (const char *type_instance,
+                             const char *type, value_t conntrack)
 {
        value_list_t vl = VALUE_LIST_INIT;
 
@@ -40,13 +42,16 @@ static void conntrack_submit (value_t conntrack)
        sstrncpy (vl.host, hostname_g, sizeof (vl.host));
        sstrncpy (vl.plugin, "conntrack", sizeof (vl.plugin));
        sstrncpy (vl.type, "conntrack", sizeof (vl.type));
+        if (type_instance != NULL)
+                sstrncpy (vl.type_instance, type_instance,
+                          sizeof (vl.type_instance));
 
        plugin_dispatch_values (&vl);
 } /* static void conntrack_submit */
 
 static int conntrack_read (void)
 {
-       value_t conntrack;
+       value_t conntrack, conntrack_max, conntrack_pct;
        FILE *fh;
        char buffer[64];
        size_t buffer_len;
@@ -74,7 +79,36 @@ static int conntrack_read (void)
        if (parse_value (buffer, &conntrack, DS_TYPE_GAUGE) != 0)
                return (-1);
 
-       conntrack_submit (conntrack);
+       conntrack_submit (NULL, "conntrack", conntrack);
+
+       fh = fopen (CONNTRACK_MAX_FILE, "r");
+       if (fh == NULL)
+               return (-1);
+
+       memset (buffer, 0, sizeof (buffer));
+       if (fgets (buffer, sizeof (buffer), fh) == NULL)
+       {
+               fclose (fh);
+               return (-1);
+       }
+       fclose (fh);
+
+       /* strip trailing newline. */
+       buffer_len = strlen (buffer);
+       while ((buffer_len > 0) && isspace ((int) buffer[buffer_len - 1]))
+       {
+               buffer[buffer_len - 1] = 0;
+               buffer_len--;
+       }
+
+       if (parse_value (buffer, &conntrack_max, DS_TYPE_GAUGE) != 0)
+               return (-1);
+
+       conntrack_submit ("max", "conntrack", conntrack_max);
+
+        conntrack_pct.gauge = (conntrack.gauge / conntrack_max.gauge) * 100;
+       conntrack_submit ("percent", "percent", conntrack_pct);
+
 
        return (0);
 } /* static int conntrack_read */