- if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
- syslog(LOG_ERR, "Couldn't create IP socket: %m");
- die(1);
+ if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
+ fatal("Couldn't create IP socket: %m");
+
+ FD_ZERO(&in_fds);
+ max_in_fd = 0;
+}
+
+/*
+ * sys_cleanup - restore any system state we modified before exiting:
+ * mark the interface down, delete default route and/or proxy arp entry.
+ * This shouldn't call die() because it's called from die().
+ */
+void
+sys_cleanup()
+{
+ struct ifreq ifr;
+
+ if (if_is_up) {
+ strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+ if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
+ && ((ifr.ifr_flags & IFF_UP) != 0)) {
+ ifr.ifr_flags &= ~IFF_UP;
+ ioctl(sockfd, SIOCSIFFLAGS, &ifr);
+ }