2 device.c -- Interaction with MacOS/X tun device
3 Copyright (C) 2001-2002 Ivo Timmermans <ivo@o2w.nl>,
4 2001-2002 Guus Sliepen <guus@sliepen.eu.org>
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.
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.
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.
20 $Id: device.c,v 1.1.2.2 2002/06/21 10:11:34 guus Exp $
27 #include <sys/types.h>
29 #include <sys/ioctl.h>
30 #include <sys/socket.h>
44 #define DEFAULT_DEVICE "/dev/tun0"
51 int device_total_in = 0;
52 int device_total_out = 0;
54 extern subnet_t mymac;
57 open the local ethertap device
59 int setup_device(void)
62 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
63 device = DEFAULT_DEVICE;
65 if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
66 interface = rindex(device, '/')?rindex(device, '/')+1:device;
68 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0)
70 syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
75 /* Set default MAC address for ethertap devices */
77 mymac.type = SUBNET_MAC;
78 mymac.net.mac.address.x[0] = 0xfe;
79 mymac.net.mac.address.x[1] = 0xfd;
80 mymac.net.mac.address.x[2] = 0x00;
81 mymac.net.mac.address.x[3] = 0x00;
82 mymac.net.mac.address.x[4] = 0x00;
83 mymac.net.mac.address.x[5] = 0x00;
85 device_info = _("MacOS/X tun device");
87 syslog(LOG_INFO, _("%s is a %s"), device, device_info);
92 void close_device(void)
99 read, encrypt and send data that is
100 available through the ethertap device
102 int read_packet(vpn_packet_t *packet)
106 if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0)
108 syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info, device, strerror(errno));
112 memcpy(packet->data, mymac.net.mac.address.x, 6);
113 memcpy(packet->data + 6, mymac.net.mac.address.x, 6);
114 packet->data[12] = 0x08;
115 packet->data[13] = 0x00;
117 packet->len = lenin + 14;
119 device_total_in += packet->len;
121 if(debug_lvl >= DEBUG_TRAFFIC)
122 syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"),
123 packet->len, device_info);
129 int write_packet(vpn_packet_t *packet)
132 if(debug_lvl >= DEBUG_TRAFFIC)
133 syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
134 packet->len, device_info);
136 if(write(device_fd, packet->data + 14, packet->len - 14) < 0)
138 syslog(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, strerror(errno));
142 device_total_out += packet->len;
146 void dump_device_stats(void)
149 syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
150 syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
151 syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);