kernel-pfroute: rescan address list for an interface if its state changes

It seems that we don't get address notifications if the interface is down
on OS X.

diff --git a/src/libhydra/plugins/kernel_pfroute/kernel_pfroute_net.c b/src/libhydra/plugins/kernel_pfroute/kernel_pfroute_net.c
index 0d12a87..2fda4ae 100644 (file)
--- a/src/libhydra/plugins/kernel_pfroute/kernel_pfroute_net.c
+++ b/src/libhydra/plugins/kernel_pfroute/kernel_pfroute_net.c
@@ -465,6 +465,47 @@ static void process_addr(private_kernel_pfroute_net_t *this,
 }
 
 /**
+ * Re-initialize address list of an interface if it changes state
+ */
+static void repopulate_iface(private_kernel_pfroute_net_t *this,
+                                                        iface_entry_t *iface)
+{
+       struct ifaddrs *ifap, *ifa;
+       addr_entry_t *addr;
+
+       while (iface->addrs->remove_last(iface->addrs, (void**)&addr) == SUCCESS)
+       {
+               addr_map_entry_remove(addr, iface, this);
+               addr_entry_destroy(addr);
+       }
+
+       if (getifaddrs(&ifap) == 0)
+       {
+               for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next)
+               {
+                       if (ifa->ifa_addr && streq(ifa->ifa_name, iface->ifname))
+                       {
+                               switch (ifa->ifa_addr->sa_family)
+                               {
+                                       case AF_INET:
+                                       case AF_INET6:
+                                               INIT(addr,
+                                                       .ip = host_create_from_sockaddr(ifa->ifa_addr),
+                                                       .refcount = 1,
+                                               );
+                                               iface->addrs->insert_last(iface->addrs, addr);
+                                               addr_map_entry_add(this, addr, iface);
+                                               break;
+                                       default:
+                                               break;
+                               }
+                       }
+               }
+               freeifaddrs(ifap);
+       }
+}
+
+/**
  * Process an RTM_IFINFO message from the kernel
  */
 static void process_link(private_kernel_pfroute_net_t *this,
@@ -494,6 +535,7 @@ static void process_link(private_kernel_pfroute_net_t *this,
                                }
                        }
                        iface->flags = msg->ifm_flags;
+                       repopulate_iface(this, iface);
                        found = TRUE;
                        break;
                }
@@ -512,6 +554,7 @@ static void process_link(private_kernel_pfroute_net_t *this,
                        DBG1(DBG_KNL, "interface %s appeared", iface->ifname);
                        iface->usable = hydra->kernel_interface->is_interface_usable(
                                                                                hydra->kernel_interface, iface->ifname);
+                       repopulate_iface(this, iface);
                        this->ifaces->insert_last(this->ifaces, iface);
                }
                else