Handle non-existant default interface in VIP definition.

When the user does not specify an interface for a VIP, a default
interface is used. This default interface is fixed to "eth0" which may
not exist on a system (for example, it may have been renamed). We
display a warning instead of just segfaulting in this case.

diff --git a/keepalived/vrrp/vrrp_ipaddress.c b/keepalived/vrrp/vrrp_ipaddress.c
index 028b818..66ab1e2 100644 (file)
--- a/keepalived/vrrp/vrrp_ipaddress.c
+++ b/keepalived/vrrp/vrrp_ipaddress.c
@@ -125,6 +125,13 @@ alloc_ipaddress(list ip_list, vector strvec, interface *ifp)
                new->ifindex = IF_INDEX(ifp);
        } else {
                new->ifp = if_get_by_ifname(DFLT_INT);
+               if (!new->ifp) {
+                       log_message(LOG_INFO, "Default interface " DFLT_INT
+                                   " does not exist and no interface specified. "
+                                   "Skip VRRP address.");
+                       FREE(new);
+                       return;
+               }
                new->ifindex = IF_INDEX(new->ifp);
        }