Update IP addresses for local interfaces

src/netlink.c

@@ -408,6 +408,51 @@ static int hostmngr_handle_nlevents_link(struct hostmngr_private *priv,
 	return NL_OK;
 }
 
+static int hostmngr_handle_nlevents_addr(struct hostmngr_private *priv,
+					 struct nlmsghdr *hdr)
+{
+	struct ifaddrmsg *ifa = nlmsg_data(hdr);
+	struct nlattr *nla[__IFA_MAX];
+	struct local_interface *iface = NULL;
+	char ifname[IFNAMSIZ] = {0};
+	struct ip_address ips[32] = {0};
+	int num_ipaddrs = 32;
+	int ret;
+
+	if (!nlmsg_valid_hdr(hdr, sizeof(*ifa)) ||
+	    (ifa->ifa_family != AF_INET6 && ifa->ifa_family != AF_INET))
+		return NL_SKIP;
+
+	nlmsg_parse(hdr, sizeof(*ifa), nla, __IFA_MAX - 1, NULL);
+
+	if_indextoname(ifa->ifa_index, ifname);
+	iface = hostmngr_ifname_to_interface(priv, ifname);
+	if (!iface)
+		return NL_SKIP;
+
+	ret = if_getaddrs(iface->ifname, ips, &num_ipaddrs);
+	if (ret)
+		return NL_SKIP;
+
+	if (num_ipaddrs == iface->num_ipaddrs &&
+	    memcmp(iface->ipaddrs, ips, num_ipaddrs * sizeof(struct ip_address)) == 0)
+		return NL_OK;
+
+	free(iface->ipaddrs);
+	iface->ipaddrs = NULL;
+	iface->num_ipaddrs = 0;
+
+	if (num_ipaddrs > 0) {
+		iface->ipaddrs = calloc(num_ipaddrs, sizeof(struct ip_address));
+		if (iface->ipaddrs) {
+			iface->num_ipaddrs = num_ipaddrs;
+			memcpy(iface->ipaddrs, ips, num_ipaddrs * sizeof(struct ip_address));
+		}
+	}
+
+	return NL_OK;
+}
+
 static int hostmngr_nlevents_cb(struct nl_msg *msg, void *arg)
 {
 	struct nlmsghdr *hdr = nlmsg_hdr(msg);
@@ -422,13 +467,11 @@ static int hostmngr_nlevents_cb(struct nl_msg *msg, void *arg)
 	case RTM_DELLINK:
 		ret = hostmngr_handle_nlevents_link(priv, hdr, add);
 		break;
-#if 0	//TODO: when needed
 	case RTM_NEWADDR:
-		add = true;
+		/* falltrough */
 	case RTM_DELADDR:
-		ret = hostmngr_handle_nlevents_addr(priv, hdr, add);
+		ret = hostmngr_handle_nlevents_addr(priv, hdr);
 		break;
-#endif
 	case RTM_NEWNEIGH:
 		add = true;
 	case RTM_DELNEIGH:
@@ -493,6 +536,7 @@ int hostmngr_register_nlevents(struct hostmngr_private *priv)
 			    hostmngr_nlevents_cb, priv);
 
 	if (nl_socket_add_memberships(rtnl_event.sock,
+				      RTNLGRP_IPV4_IFADDR, RTNLGRP_IPV6_IFADDR,
 				      RTNLGRP_NEIGH, RTNLGRP_LINK, 0))
 		goto out_err;