Support alternative tun/tap driver from http://www-user.rhrk.uni-kl.de/~nissler/tuntap/

diff --git a/src/darwin/device.c b/src/darwin/device.c
index f787f15..c3f3c0b 100644 (file)
--- a/src/darwin/device.c
+++ b/src/darwin/device.c
@@ -25,19 +25,28 @@
 #include "conf.h"
 #include "logger.h"
 #include "net.h"
+#include "route.h"
 #include "utils.h"
 
 #define DEFAULT_DEVICE "/dev/tun0"
 
+typedef enum device_type {
+       DEVICE_TYPE_TUN,
+       DEVICE_TYPE_TAP,
+} device_type_t;
+
 int device_fd = -1;
 char *device;
 char *iface;
 char *device_info;
 int device_total_in = 0;
 int device_total_out = 0;
+static device_type_t device_type = DEVICE_TYPE_TUN;
 
 bool setup_device(void)
 {
+       char *type;
+
        cp();
 
        if(!get_config_string(lookup_config(config_tree, "Device"), &device))
@@ -51,7 +60,32 @@ bool setup_device(void)
                return false;
        }
 
-       device_info = _("MacOS/X tun device");
+       if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
+               if(!strcasecmp(type, "tun"))
+                       device_type = DEVICE_TYPE_TUN;
+               else if(!strcasecmp(type, "tap"))
+                       device_type = DEVICE_TYPE_TAP;
+               else {
+                       logger(LOG_ERR, _("Unknown device type %s!"), type);
+                       return false;
+               }
+       } else {
+               if(strstr(device, "tap"))
+                       device_type = DEVICE_TYPE_TAP;
+       }
+
+       switch(device_type) {
+               default:
+                       device_type = DEVICE_TYPE_TUN;
+               case DEVICE_TYPE_TUN:
+                       device_info = _("MacOS/X tun device");
+                       break;
+               case DEVICE_TYPE_TAP:
+                       if(routing_mode == RMODE_ROUTER)
+                               overwrite_mac = true;
+                       device_info = _("MacOS/X tap device");
+                       break;
+       }
 
        logger(LOG_INFO, _("%s is a %s"), device, device_info);
 
@@ -71,17 +105,45 @@ bool read_packet(vpn_packet_t *packet)
 
        cp();
 
-       if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
-               logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
-                          device, strerror(errno));
-               return false;
+       switch(device_type) {
+               case DEVICE_TYPE_TUN:
+                       if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
+                               logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
+                                          device, strerror(errno));
+                               return false;
+                       }
+
+                       switch(packet->data[14] >> 4) {
+                               case 4:
+                                       packet->data[12] = 0x08;
+                                       packet->data[13] = 0x00;
+                                       break;
+                               case 6:
+                                       packet->data[12] = 0x86;
+                                       packet->data[13] = 0xDD;
+                                       break;
+                               default:
+                                       ifdebug(TRAFFIC) logger(LOG_ERR,
+                                                          _ ("Unknown IP type %d while reading packet from %s %s"),
+                                                          packet->data[14] >> 4, device_info, device);
+                                       return false;
+                       }
+
+                       packet->len = lenin + 14;
+                       break;
+               case DEVICE_TYPE_TAP:
+                       if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
+                               logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
+                                          device, strerror(errno));
+                               return false;
+                       }
+
+                       packet->len = lenin;
+                       break;
+               default:
+                       return false;
        }
-
-       packet->data[12] = 0x08;
-       packet->data[13] = 0x00;
-
-       packet->len = lenin + 14;
-
+               
        device_total_in += packet->len;
 
        ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"),
@@ -97,10 +159,23 @@ bool write_packet(vpn_packet_t *packet)
        ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
                           packet->len, device_info);
 
-       if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
-               logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
-                          device, strerror(errno));
-               return false;
+       switch(device_type) {
+               case DEVICE_TYPE_TUN:
+                       if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
+                               logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
+                                          device, strerror(errno));
+                               return false;
+                       }
+                       break;
+               case DEVICE_TYPE_TAP:
+                       if(write(device_fd, packet->data, packet->len) < 0) {
+                               logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
+                                          device, strerror(errno));
+                               return false;
+                       }
+                       break;
+               default:
+                       return false;
        }
 
        device_total_out += packet->len;