tinc-vpn.org Git - tinc/blob - src/darwin/device.c

   1 /*
   2     device.c -- Interaction with MacOS/X tun device
   3     Copyright (C) 2001-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
   4                   2001-2004 Guus Sliepen <guus@tinc-vpn.org>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id$
  21 */
  22
  23 #include "system.h"
  24
  25 #include "conf.h"
  26 #include "logger.h"
  27 #include "net.h"
  28 #include "route.h"
  29 #include "utils.h"
  30
  31 #define DEFAULT_DEVICE "/dev/tun0"
  32
  33 typedef enum device_type {
  34         DEVICE_TYPE_TUN,
  35         DEVICE_TYPE_TAP,
  36 } device_type_t;
  37
  38 int device_fd = -1;
  39 char *device;
  40 char *iface;
  41 char *device_info;
  42 static int device_total_in = 0;
  43 static int device_total_out = 0;
  44 static device_type_t device_type = DEVICE_TYPE_TUN;
  45
  46 bool setup_device(void)
  47 {
  48         char *type;
  49
  50         cp();
  51
  52         if(!get_config_string(lookup_config(config_tree, "Device"), &device))
  53                 device = DEFAULT_DEVICE;
  54
  55         if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
  56                 iface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
  57
  58         if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
  59                 logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
  60                 return false;
  61         }
  62
  63         if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
  64                 if(!strcasecmp(type, "tun"))
  65                         device_type = DEVICE_TYPE_TUN;
  66                 else if(!strcasecmp(type, "tap"))
  67                         device_type = DEVICE_TYPE_TAP;
  68                 else {
  69                         logger(LOG_ERR, _("Unknown device type %s!"), type);
  70                         return false;
  71                 }
  72         } else {
  73                 if(strstr(device, "tap"))
  74                         device_type = DEVICE_TYPE_TAP;
  75         }
  76
  77         switch(device_type) {
  78                 default:
  79                         device_type = DEVICE_TYPE_TUN;
  80                 case DEVICE_TYPE_TUN:
  81                         device_info = _("MacOS/X tun device");
  82                         break;
  83                 case DEVICE_TYPE_TAP:
  84                         if(routing_mode == RMODE_ROUTER)
  85                                 overwrite_mac = true;
  86                         device_info = _("MacOS/X tap device");
  87                         break;
  88         }
  89
  90         logger(LOG_INFO, _("%s is a %s"), device, device_info);
  91
  92         return true;
  93 }
  94
  95 void close_device(void)
  96 {
  97         cp();
  98
  99         close(device_fd);
 100 }
 101
 102 bool read_packet(vpn_packet_t *packet)
 103 {
 104         int lenin;
 105
 106         cp();
 107
 108         switch(device_type) {
 109                 case DEVICE_TYPE_TUN:
 110                         if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
 111                                 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 112                                            device, strerror(errno));
 113                                 return false;
 114                         }
 115
 116                         switch(packet->data[14] >> 4) {
 117                                 case 4:
 118                                         packet->data[12] = 0x08;
 119                                         packet->data[13] = 0x00;
 120                                         break;
 121                                 case 6:
 122                                         packet->data[12] = 0x86;
 123                                         packet->data[13] = 0xDD;
 124                                         break;
 125                                 default:
 126                                         ifdebug(TRAFFIC) logger(LOG_ERR,
 127                                                            _ ("Unknown IP type %d while reading packet from %s %s"),
 128                                                            packet->data[14] >> 4, device_info, device);
 129                                         return false;
 130                         }
 131
 132                         packet->len = lenin + 14;
 133                         break;
 134                 case DEVICE_TYPE_TAP:
 135                         if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
 136                                 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
 137                                            device, strerror(errno));
 138                                 return false;
 139                         }
 140
 141                         packet->len = lenin;
 142                         break;
 143                 default:
 144                         return false;
 145         }
 146
 147         device_total_in += packet->len;
 148
 149         ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"),
 150                            packet->len, device_info);
 151
 152         return true;
 153 }
 154
 155 bool write_packet(vpn_packet_t *packet)
 156 {
 157         cp();
 158
 159         ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
 160                            packet->len, device_info);
 161
 162         switch(device_type) {
 163                 case DEVICE_TYPE_TUN:
 164                         if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
 165                                 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
 166                                            device, strerror(errno));
 167                                 return false;
 168                         }
 169                         break;
 170                 case DEVICE_TYPE_TAP:
 171                         if(write(device_fd, packet->data, packet->len) < 0) {
 172                                 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
 173                                            device, strerror(errno));
 174                                 return false;
 175                         }
 176                         break;
 177                 default:
 178                         return false;
 179         }
 180
 181         device_total_out += packet->len;
 182
 183         return true;
 184 }
 185
 186 void dump_device_stats(void)
 187 {
 188         cp();
 189
 190         logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
 191         logger(LOG_DEBUG, _(" total bytes in:  %10d"), device_total_in);
 192         logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
 193 }