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pcg |
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/* |
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device.c -- Interaction with OpenBSD tun device |
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Copyright (C) 2001-2003 Ivo Timmermans <ivo@o2w.nl>, |
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2001-2003 Guus Sliepen <guus@sliepen.eu.org> |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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$Id: device.c,v 1.1.2.19 2003/08/08 11:45:37 guus Exp $ |
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*/ |
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#include <sys/uio.h> |
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#define DEFAULT_DEVICE "/dev/tun0" |
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#define DEVICE_TYPE_ETHERTAP 0 |
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#define DEVICE_TYPE_TUNTAP 1 |
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int device_fd = -1; |
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char *device; |
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char *iface; |
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char *device_info; |
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int device_total_in = 0; |
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int device_total_out = 0; |
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bool setup_device(void) |
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{ |
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cp(); |
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if(!get_config_string(lookup_config(config_tree, "Device"), &device)) |
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device = DEFAULT_DEVICE; |
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if(!get_config_string(lookup_config(config_tree, "Interface"), &iface)) |
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iface = rindex(device, '/') ? rindex(device, '/') + 1 : device; |
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if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) { |
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logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno)); |
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return false; |
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} |
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device_info = _("OpenBSD tun device"); |
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logger(LOG_INFO, _("%s is a %s"), device, device_info); |
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return true; |
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} |
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void close_device(void) |
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{ |
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cp(); |
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close(device_fd); |
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} |
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bool read_packet(vpn_packet_t *packet) |
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{ |
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int lenin; |
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u_int32_t type; |
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struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}}; |
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cp(); |
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if((lenin = readv(device_fd, vector, 2)) <= 0) { |
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logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info, |
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device, strerror(errno)); |
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return false; |
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} |
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switch (ntohl(type)) { |
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case AF_INET: |
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packet->data[12] = 0x8; |
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packet->data[13] = 0x0; |
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break; |
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case AF_INET6: |
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packet->data[12] = 0x86; |
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packet->data[13] = 0xDD; |
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break; |
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default: |
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ifdebug(TRAFFIC) logger(LOG_ERR, |
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_ ("Unknown address family %d while reading packet from %s %s"), |
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ntohl(type), device_info, device); |
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return false; |
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} |
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packet->len = lenin + 10; |
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device_total_in += packet->len; |
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len, |
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device_info); |
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return true; |
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} |
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bool write_packet(vpn_packet_t *packet) |
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{ |
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u_int32_t type; |
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struct iovec vector[2]; |
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int af; |
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cp(); |
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"), |
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packet->len, device_info); |
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af = (packet->data[12] << 8) + packet->data[13]; |
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switch (af) { |
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case 0x800: |
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type = htonl(AF_INET); |
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break; |
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case 0x86DD: |
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type = htonl(AF_INET6); |
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break; |
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default: |
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ifdebug(TRAFFIC) logger(LOG_ERR, |
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_("Unknown address family %d while writing packet to %s %s"), |
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af, device_info, device); |
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return false; |
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} |
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vector[0].iov_base = &type; |
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vector[0].iov_len = sizeof(type); |
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vector[1].iov_base = packet->data + 14; |
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vector[1].iov_len = packet->len - 14; |
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if(writev(device_fd, vector, 2) < 0) { |
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logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device, |
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strerror(errno)); |
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return false; |
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} |
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device_total_out += packet->len; |
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return true; |
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} |
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void dump_device_stats(void) |
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{ |
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cp(); |
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logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device); |
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logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in); |
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logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out); |
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} |
