added tun

git-svn-id: svn://anubis/misc/tun@244 bd8a9e45-a331-0410-811e-c64571078777

Makefile

@@ -0,0 +1,5 @@
+
+all: tun
+
+tun: tun.c
+	gcc -o $@ $^

tun.c

@@ -0,0 +1,38 @@
+
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <linux/if_tun.h>
+
+int main()
+{
+	struct ifreq ifr;
+	int fd, err;
+	if ( (fd = open("/dev/net/tun", O_RDWR)) < 0)
+	{
+		fprintf(stderr, "Couldn't open /dev/net/tun!\n");
+		return -1;
+	}
+
+	memset(&ifr, 0, sizeof(ifr));
+
+	ifr.ifr_flags = IFF_TUN;
+	strncpy(ifr.ifr_name, "tun99", IFNAMSIZ);
+
+	if ( (err = ioctl(fd, TUNSETIFF, &ifr)) < 0)
+	{
+		close(fd);
+		fprintf(stderr, "Couldn't ioctl(fd, TUNSETIFF, &ifr)!\n");
+		return -2;
+	}
+	printf("Device name: %s\n", ifr.ifr_name);
+
+	printf("Hit enter\n");
+	char chr;
+	scanf("%c", &chr);
+
+	close(fd);
+	return 0;
+}