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 1.1.2.7 2003/07/06 22:11:33 guus Exp $
27 #include <sys/types.h>
29 #include <sys/ioctl.h>
30 #include <sys/socket.h>
43 #define DEFAULT_DEVICE "/dev/tun0"
50 int device_total_in = 0;
51 int device_total_out = 0;
54 open the local ethertap device
56 int setup_device(void)
60 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
61 device = DEFAULT_DEVICE;
63 if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
64 interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
66 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
67 logger(DEBUG_ALWAYS, LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
71 device_info = _("MacOS/X tun device");
73 logger(DEBUG_ALWAYS, LOG_INFO, _("%s is a %s"), device, device_info);
78 void close_device(void)
86 read, encrypt and send data that is
87 available through the ethertap device
89 int read_packet(vpn_packet_t *packet)
95 if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
96 logger(DEBUG_ALWAYS, LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
97 device, strerror(errno));
101 packet->data[12] = 0x08;
102 packet->data[13] = 0x00;
104 packet->len = lenin + 14;
106 device_total_in += packet->len;
108 logger(DEBUG_TRAFFIC, LOG_DEBUG, _("Read packet of %d bytes from %s"),
109 packet->len, device_info);
114 int write_packet(vpn_packet_t *packet)
118 logger(DEBUG_TRAFFIC, LOG_DEBUG, _("Writing packet of %d bytes to %s"),
119 packet->len, device_info);
121 if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
122 logger(DEBUG_ALWAYS, LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
123 device, strerror(errno));
127 device_total_out += packet->len;
130 void dump_device_stats(void)
134 logger(DEBUG_ALWAYS, LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
135 logger(DEBUG_ALWAYS, LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
136 logger(DEBUG_ALWAYS, LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);