2 device.c -- Interaction with OpenBSD tun device
3 Copyright (C) 2001-2003 Ivo Timmermans <ivo@o2w.nl>,
4 2001-2003 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 1.1.2.19 2003/08/08 11:45:37 guus Exp $
31 #define DEFAULT_DEVICE "/dev/tun0"
33 #define DEVICE_TYPE_ETHERTAP 0
34 #define DEVICE_TYPE_TUNTAP 1
41 int device_total_in = 0;
42 int device_total_out = 0;
44 bool setup_device(void)
48 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
49 device = DEFAULT_DEVICE;
51 if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
52 iface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
53 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
54 logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
58 device_info = _("OpenBSD tun device");
60 logger(LOG_INFO, _("%s is a %s"), device, device_info);
65 void close_device(void)
72 bool read_packet(vpn_packet_t *packet)
76 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
80 if((lenin = readv(device_fd, vector, 2)) <= 0) {
81 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
82 device, strerror(errno));
86 switch (ntohl(type)) {
88 packet->data[12] = 0x8;
89 packet->data[13] = 0x0;
93 packet->data[12] = 0x86;
94 packet->data[13] = 0xDD;
98 ifdebug(TRAFFIC) logger(LOG_ERR,
99 _ ("Unknown address family %d while reading packet from %s %s"),
100 ntohl(type), device_info, device);
104 packet->len = lenin + 10;
106 device_total_in += packet->len;
108 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
114 bool write_packet(vpn_packet_t *packet)
117 struct iovec vector[2];
122 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
123 packet->len, device_info);
125 af = (packet->data[12] << 8) + packet->data[13];
129 type = htonl(AF_INET);
132 type = htonl(AF_INET6);
135 ifdebug(TRAFFIC) logger(LOG_ERR,
136 _("Unknown address family %d while writing packet to %s %s"),
137 af, device_info, device);
141 vector[0].iov_base = &type;
142 vector[0].iov_len = sizeof(type);
143 vector[1].iov_base = packet->data + 14;
144 vector[1].iov_len = packet->len - 14;
146 if(writev(device_fd, vector, 2) < 0) {
147 logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
152 device_total_out += packet->len;
157 void dump_device_stats(void)
161 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
162 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
163 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);