bring the tun device up automatically

1 files changed, 11 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index 393f98b..f4672b5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -28,6 +28,17 @@ static void setup_tundev(const char *in_ifname)
 
 	debug("setup_tundev: created tuntap interface: %s", in_ifname);
 
+	struct ifreq ifr2;
+	memset(&ifr2, 0, sizeof(ifr2));
+	ifr2.ifr_flags = IFF_UP|IFF_RUNNING;
+	strncpy(ifr2.ifr_name, in_ifname, IFNAMSIZ - 1);
+	int tmpfd = socket(AF_INET, SOCK_DGRAM, 0);
+	if (tmpfd < 0)
+		fatal("setup_tundev: socket(): %s", strerror(errno));
+	if (ioctl(tmpfd, SIOCSIFFLAGS, &ifr2) < 0)
+		fatal("setup_tundev: ioctl(SIOCSIFFLAGS): %s", strerror(errno));
+	close(tmpfd);
+
 	tun_fd = fd;
 }