1 files changed, 115 insertions, 0 deletions
diff --git a/libdnet-stripped/src/tun-linux.c b/libdnet-stripped/src/tun-linux.c
new file mode 100644
index 0000000..38fe0b4
--- /dev/null
+++ b/libdnet-stripped/src/tun-linux.c
@@ -0,0 +1,115 @@
+/*
+ * tun-linux.c
+ *
+ * Universal TUN/TAP driver, in Linux 2.4+
+ * /usr/src/linux/Documentation/networking/tuntap.txt
+ *
+ * Copyright (c) 2001 Dug Song <dugsong@monkey.org>
+ *
+ * $Id: tun-linux.c 612 2005-09-12 02:18:06Z dugsong $
+ */
+
+#include "config.h"
+
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+
+#include <linux/if.h>
+#include <linux/if_tun.h>
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "dnet.h"
+
+struct tun {
+	int fd;
+	intf_t *intf;
+	struct ifreq ifr;
+};
+
+tun_t *
+tun_open(struct addr *src, struct addr *dst, int mtu)
+{
+	tun_t *tun;
+	struct intf_entry ifent;
+	
+	if ((tun = calloc(1, sizeof(*tun))) == NULL)
+		return (NULL);
+
+	if ((tun->fd = open("/dev/net/tun", O_RDWR, 0)) < 0 ||
+	    (tun->intf = intf_open()) == NULL)
+		return (tun_close(tun));
+	
+	tun->ifr.ifr_flags = IFF_TUN;
+
+	if (ioctl(tun->fd, TUNSETIFF, (void *) &tun->ifr) < 0)
+		return (tun_close(tun));
+
+	memset(&ifent, 0, sizeof(ifent));
+	strlcpy(ifent.intf_name, tun->ifr.ifr_name, sizeof(ifent.intf_name));
+	ifent.intf_flags = INTF_FLAG_UP|INTF_FLAG_POINTOPOINT;
+	ifent.intf_addr = *src;
+	ifent.intf_dst_addr = *dst;	
+	ifent.intf_mtu = mtu;
+	
+	if (intf_set(tun->intf, &ifent) < 0)
+		return (tun_close(tun));
+	
+	return (tun);
+}
+
+const char *
+tun_name(tun_t *tun)
+{
+	return (tun->ifr.ifr_name);
+}
+
+int
+tun_fileno(tun_t *tun)
+{
+	return (tun->fd);
+}
+
+ssize_t
+tun_send(tun_t *tun, const void *buf, size_t size)
+{
+	struct iovec iov[2];
+	uint32_t type = ETH_TYPE_IP;
+	
+	iov[0].iov_base = &type;
+	iov[0].iov_len = sizeof(type);
+	iov[1].iov_base = (void *)buf;
+	iov[1].iov_len = size;
+	
+	return (writev(tun->fd, iov, 2));
+}
+
+ssize_t
+tun_recv(tun_t *tun, void *buf, size_t size)
+{
+	struct iovec iov[2];
+	uint32_t type;
+
+	iov[0].iov_base = &type;
+	iov[0].iov_len = sizeof(type);
+	iov[1].iov_base = (void *)buf;
+	iov[1].iov_len = size;
+	
+	return (readv(tun->fd, iov, 2) - sizeof(type));
+}
+
+tun_t *
+tun_close(tun_t *tun)
+{
+	if (tun->fd > 0)
+		close(tun->fd);
+	if (tun->intf != NULL)
+		intf_close(tun->intf);
+	free(tun);
+	return (NULL);
+}