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 1.1.2.6 2003/06/11 19:28:36 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;
55 open the local ethertap device
57 int setup_device(void)
61 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
62 device = DEFAULT_DEVICE;
64 if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
65 interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
67 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
68 syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
72 device_info = _("MacOS/X tun device");
74 syslog(LOG_INFO, _("%s is a %s"), device, device_info);
79 void close_device(void)
87 read, encrypt and send data that is
88 available through the ethertap device
90 int read_packet(vpn_packet_t *packet)
96 if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
97 syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
98 device, strerror(errno));
102 packet->data[12] = 0x08;
103 packet->data[13] = 0x00;
105 packet->len = lenin + 14;
107 device_total_in += packet->len;
109 if(debug_lvl >= DEBUG_TRAFFIC)
110 syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"),
111 packet->len, device_info);
116 int write_packet(vpn_packet_t *packet)
120 if(debug_lvl >= DEBUG_TRAFFIC)
121 syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
122 packet->len, device_info);
124 if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
125 syslog(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
126 device, strerror(errno));
130 device_total_out += packet->len;
133 void dump_device_stats(void)
137 syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
138 syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
139 syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);