2 device.c -- Interaction with OpenBSD tun device
3 Copyright (C) 2001-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
4 2001-2004 Guus Sliepen <guus@tinc-vpn.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.
31 #define DEFAULT_DEVICE "/dev/tun0"
38 static int device_total_in = 0;
39 static int device_total_out = 0;
41 bool setup_device(void)
45 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
46 device = DEFAULT_DEVICE;
48 if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
49 iface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
50 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
51 logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
55 device_info = _("OpenBSD tun device");
57 logger(LOG_INFO, _("%s is a %s"), device, device_info);
62 void close_device(void)
69 bool read_packet(vpn_packet_t *packet)
73 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
77 if((lenin = readv(device_fd, vector, 2)) <= 0) {
78 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
79 device, strerror(errno));
83 switch (ntohl(type)) {
85 packet->data[12] = 0x8;
86 packet->data[13] = 0x0;
90 packet->data[12] = 0x86;
91 packet->data[13] = 0xDD;
95 ifdebug(TRAFFIC) logger(LOG_ERR,
96 _ ("Unknown address family %d while reading packet from %s %s"),
97 ntohl(type), device_info, device);
101 packet->len = lenin + 10;
103 device_total_in += packet->len;
105 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
111 bool write_packet(vpn_packet_t *packet)
114 struct iovec vector[2];
119 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
120 packet->len, device_info);
122 af = (packet->data[12] << 8) + packet->data[13];
126 type = htonl(AF_INET);
129 type = htonl(AF_INET6);
132 ifdebug(TRAFFIC) logger(LOG_ERR,
133 _("Unknown address family %d while writing packet to %s %s"),
134 af, device_info, device);
138 vector[0].iov_base = &type;
139 vector[0].iov_len = sizeof(type);
140 vector[1].iov_base = packet->data + 14;
141 vector[1].iov_len = packet->len - 14;
143 if(writev(device_fd, vector, 2) < 0) {
144 logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
149 device_total_out += packet->len;
154 void dump_device_stats(void)
158 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
159 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
160 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);