- struct ortentry rt;
-
- SET_SA_FAMILY(rt.rt_dst, AF_INET);
- SET_SA_FAMILY(rt.rt_gateway, AF_INET);
- ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
- rt.rt_flags = RTF_GATEWAY;
- if (ioctl(s, SIOCADDRT, &rt) < 0) {
- syslog(LOG_ERR, "default route ioctl(SIOCADDRT): %m");
+ return dodefaultroute(g, 's');
+}
+
+/*
+ * cifdefaultroute - delete a default route through the address given.
+ */
+int
+cifdefaultroute(u, g)
+ int u;
+ u_long g;
+{
+ return dodefaultroute(g, 'c');
+}
+
+/*
+ * dodefaultroute - talk to a routing socket to add/delete a default route.
+ */
+int
+dodefaultroute(g, cmd)
+ u_long g;
+ int cmd;
+{
+ int routes;
+ struct {
+ struct rt_msghdr hdr;
+ struct sockaddr_in dst;
+ struct sockaddr_in gway;
+ struct sockaddr_in mask;
+ } rtmsg;
+
+ if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
+ syslog(LOG_ERR, "%cifdefaultroute: opening routing socket: %m", cmd);
+ return 0;
+ }
+
+ memset(&rtmsg, 0, sizeof(rtmsg));
+ rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
+ rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY;
+ rtmsg.hdr.rtm_version = RTM_VERSION;
+ rtmsg.hdr.rtm_seq = ++rtm_seq;
+ rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
+ rtmsg.dst.sin_len = sizeof(rtmsg.dst);
+ rtmsg.dst.sin_family = AF_INET;
+ rtmsg.gway.sin_len = sizeof(rtmsg.gway);
+ rtmsg.gway.sin_family = AF_INET;
+ rtmsg.gway.sin_addr.s_addr = g;
+ rtmsg.mask.sin_len = sizeof(rtmsg.dst);
+ rtmsg.mask.sin_family = AF_INET;
+
+ rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
+ if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
+ syslog(LOG_ERR, "%s default route: %m", cmd=='s'? "add": "delete");
+ close(routes);