*bsd: listen on PF_ROUTE socket to get interface changes

Only OpenBSD is able to filter messages. We could filter messages for
FreeBSD and NetBSD after receiving them but we don't bother doing
it. Any change will trigger a rescan of the interfaces. Since this
cannot happen more than once per second, this should be OK for most
people.

diff --git a/src/daemon/interfaces-bsd.c b/src/daemon/interfaces-bsd.c
index c157aa2cbee7c184cff6d24a512ca06142286d12..aeedf9e57ecc2c4beec3a450da4950bc41042d45 100644 (file)
--- a/src/daemon/interfaces-bsd.c
+++ b/src/daemon/interfaces-bsd.c
@@ -730,6 +730,26 @@ interfaces_update(struct lldpd *cfg)
                ifbsd_macphy(cfg, hardware);
        }
 
+       if (cfg->g_iface_event == NULL) {
+               int s;
+               log_debug("interfaces", "subscribe to route socket notifications");
+               if ((s = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
+                       log_warn("interfaces", "unable to open route socket");
+                       goto end;
+               }
+
+#ifdef ROUTE_MSGFILTER
+               unsigned int rtfilter;
+               rtfilter = ROUTE_FILTER(RTM_IFINFO);
+               if (setsockopt(s, PF_ROUTE, ROUTE_MSGFILTER,
+                       &rtfilter, sizeof(rtfilter)) == -1)
+                       log_warn("interfaces", "unable to set filter for interface updates");
+#endif
+
+               if (levent_iface_subscribe(cfg, s) == -1)
+                       close(s);
+       }
+
 end:
        interfaces_free_devices(interfaces);
        interfaces_free_addresses(addresses);