From 69b758879ee6d322e89143141b98d52167845c26 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@tinc-vpn.org>
Date: Mon, 10 Jun 2002 14:33:40 +0000
Subject: [PATCH] Added Darwin (MacOS/X) tun device handling.

---
 src/darwin/device.c | 153 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 src/darwin/device.c

diff --git a/src/darwin/device.c b/src/darwin/device.c
new file mode 100644
index 00000000..ecd1d14b
--- /dev/null
+++ b/src/darwin/device.c
@@ -0,0 +1,153 @@
+/*
+    device.c -- Interaction with MacOS/X tun device
+    Copyright (C) 2001-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
+                  2001-2002 Guus Sliepen <guus@sliepen.warande.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id: device.c,v 1.1.2.1 2002/06/10 14:33:40 guus Exp $
+*/
+
+#include "config.h"
+
+#include <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <string.h>
+
+#include <utils.h>
+#include "conf.h"
+#include "net.h"
+#include "subnet.h"
+
+#include "system.h"
+
+#define DEFAULT_DEVICE "/dev/tun0"
+
+int device_fd = -1;
+int device_type;
+char *device;
+char *interface;
+char *device_info;
+int device_total_in = 0;
+int device_total_out = 0;
+
+extern subnet_t mymac;
+
+/*
+  open the local ethertap device
+*/
+int setup_device(void)
+{
+cp
+  if(!get_config_string(lookup_config(config_tree, "Device"), &device))
+    device = DEFAULT_DEVICE;
+
+  if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
+    interface = rindex(device, '/')?rindex(device, '/')+1:device;
+cp
+  if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0)
+    {
+      syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
+      return -1;
+    }
+cp
+
+  /* Set default MAC address for ethertap devices */
+
+  mymac.type = SUBNET_MAC;
+  mymac.net.mac.address.x[0] = 0xfe;
+  mymac.net.mac.address.x[1] = 0xfd;
+  mymac.net.mac.address.x[2] = 0x00;
+  mymac.net.mac.address.x[3] = 0x00;
+  mymac.net.mac.address.x[4] = 0x00;
+  mymac.net.mac.address.x[5] = 0x00;
+
+  device_info = _("MacOS/X tun device");
+
+  syslog(LOG_INFO, _("%s is a %s"), device, device_info);
+cp
+  return 0;
+}
+
+void close_device(void)
+{
+cp
+  close(device_fd);
+}
+
+/*
+  read, encrypt and send data that is
+  available through the ethertap device
+*/
+int read_packet(vpn_packet_t *packet)
+{
+  int lenin;
+cp
+  if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0)
+    {
+      syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info, device, strerror(errno));
+      return -1;
+    }
+
+  memcpy(packet->data, mymac.net.mac.address.x, 6);
+  memcpy(packet->data + 6, mymac.net.mac.address.x, 6);
+  packet->data[12] = 0x08;
+  packet->data[13] = 0x00;
+
+  packet->len = lenin + 14;
+
+  device_total_in += packet->len;
+
+  if(debug_lvl >= DEBUG_TRAFFIC)
+    syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"),
+           packet->len, device_info);
+
+  return 0;
+cp
+}
+
+int write_packet(vpn_packet_t *packet)
+{
+cp
+  if(debug_lvl >= DEBUG_TRAFFIC)
+    syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
+           packet->len, device_info);
+
+  if(write(device_fd, packet->data + 14, packet->len - 14) < 0)
+    {
+      syslog(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, strerror(errno));
+      return -1;
+    }
+
+  device_total_out += packet->len;
+cp
+}
+
+void dump_device_stats(void)
+{
+cp
+  syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
+  syslog(LOG_DEBUG, _(" total bytes in:  %10d"), device_total_in);
+  syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
+cp
+}