X-Git-Url: https://unix4lyfe.org/gitweb/darkstat-debian/blobdiff_plain/85d7d6e7b81dff84df8ddc87815ce77b8d82bc07..3c6b3682c70be84db86e70c191016913a9836c31:/cap.c

diff --git a/cap.c b/cap.c
index 7e1c41b..62da77d 100644
--- a/cap.c
+++ b/cap.c
@@ -1,5 +1,5 @@
 /* darkstat 3
- * copyright (c) 2001-2011 Emil Mikulic.
+ * copyright (c) 2001-2014 Emil Mikulic.
  *
  * cap.c: capture packets, and hand them off to decode and acct.
  *
@@ -398,12 +398,21 @@ static void callback(u_char *user,
 /* Process any packets currently in the capture buffer. */
 void cap_poll(fd_set *read_set _unused_on_linux_) {
    struct cap_iface *iface;
+   static int told = 0;
 
    STAILQ_FOREACH(iface, &cap_ifs, entries) {
       /* Once per capture poll, check our IP address.  It's used in accounting
        * for traffic graphs.
        */
       localip_update(iface->name, &iface->local_ips);
+      if (!told && iface->local_ips.num_addrs == 0) {
+         verbosef("interface '%s' has no addresses, "
+                  "your graphs will be blank",
+                  iface->name);
+         verbosef("please read the darkstat manpage, "
+                  "and consider using the -l option");
+         told = 1;
+      }
 
       for (;;) {
          struct timespec t;
@@ -415,18 +424,19 @@ void cap_poll(fd_set *read_set _unused_on_linux_) {
                -1, /* count = entire buffer */
                callback,
                (u_char*)iface); /* user = struct to pass to callback */
+         timer_stop(&t,
+                    2 * CAP_TIMEOUT_MSEC * 1000000,
+                    "pcap_dispatch took too long");
 
          if (ret < 0) {
             warnx("pcap_dispatch('%s'): %s",
                iface->name, pcap_geterr(iface->pcap));
             continue;
          }
-         timer_stop(&t,
-                    2 * CAP_TIMEOUT_MSEC * 1000000,
-                    "pcap_dispatch took too long");
 
-         if (0) /* debugging */
-            verbosef("iface '%s' got %d pkts", iface->name, ret);
+#if 0 /* debugging */
+         verbosef("iface '%s' got %d pkts", iface->name, ret);
+#endif
 
 #ifdef linux
          /* keep looping until we've dispatched all the outstanding packets */