6a51d89cf7
Found by cppcheck, which complained about lenin not being initialized, but the real problem is that reading packets would fail when using code compiled with --tunemu on a normal tun device.
357 lines
8.6 KiB
C
357 lines
8.6 KiB
C
/*
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device.c -- Interaction BSD tun/tap device
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Copyright (C) 2001-2005 Ivo Timmermans,
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2001-2009 Guus Sliepen <guus@tinc-vpn.org>
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2009 Grzegorz Dymarek <gregd72002@googlemail.com>
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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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "system.h"
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#include "conf.h"
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#include "logger.h"
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#include "net.h"
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#include "route.h"
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#include "utils.h"
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#include "xalloc.h"
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#ifdef HAVE_TUNEMU
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#include "bsd/tunemu.h"
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#endif
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#define DEFAULT_DEVICE "/dev/tun0"
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typedef enum device_type {
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DEVICE_TYPE_TUN,
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DEVICE_TYPE_TUNIFHEAD,
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DEVICE_TYPE_TAP,
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#ifdef HAVE_TUNEMU
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DEVICE_TYPE_TUNEMU,
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#endif
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} device_type_t;
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int device_fd = -1;
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char *device = NULL;
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char *iface = NULL;
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static char *device_info = NULL;
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static uint64_t device_total_in = 0;
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static uint64_t device_total_out = 0;
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#if defined(TUNEMU)
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static device_type_t device_type = DEVICE_TYPE_TUNEMU;
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#elif defined(HAVE_OPENBSD) || defined(HAVE_FREEBSD)
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static device_type_t device_type = DEVICE_TYPE_TUNIFHEAD;
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#else
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static device_type_t device_type = DEVICE_TYPE_TUN;
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#endif
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bool setup_device(void) {
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char *type;
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if(!get_config_string(lookup_config(config_tree, "Device"), &device))
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device = xstrdup(DEFAULT_DEVICE);
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if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
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iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
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if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
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if(!strcasecmp(type, "tun"))
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/* use default */;
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#ifdef HAVE_TUNEMU
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else if(!strcasecmp(type, "tunemu"))
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device_type = DEVICE_TYPE_TUNEMU;
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#endif
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else if(!strcasecmp(type, "tunnohead"))
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device_type = DEVICE_TYPE_TUN;
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else if(!strcasecmp(type, "tunifhead"))
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device_type = DEVICE_TYPE_TUNIFHEAD;
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else if(!strcasecmp(type, "tap"))
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device_type = DEVICE_TYPE_TAP;
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else {
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logger(LOG_ERR, "Unknown device type %s!", type);
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return false;
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}
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} else {
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if(strstr(device, "tap") || routing_mode != RMODE_ROUTER)
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device_type = DEVICE_TYPE_TAP;
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}
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switch(device_type) {
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#ifdef HAVE_TUNEMU
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case DEVICE_TYPE_TUNEMU: {
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char dynamic_name[256] = "";
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device_fd = tunemu_open(dynamic_name);
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}
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break;
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#endif
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default:
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device_fd = open(device, O_RDWR | O_NONBLOCK);
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}
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if(device_fd < 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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switch(device_type) {
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default:
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device_type = DEVICE_TYPE_TUN;
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case DEVICE_TYPE_TUN:
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#ifdef TUNSIFHEAD
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{
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const int zero = 0;
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if(ioctl(device_fd, TUNSIFHEAD, &zero, sizeof zero) == -1) {
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logger(LOG_ERR, "System call `%s' failed: %s", "ioctl", strerror(errno));
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return false;
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}
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}
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#endif
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#if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
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{
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const int mode = IFF_BROADCAST | IFF_MULTICAST;
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ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
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}
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#endif
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device_info = "Generic BSD tun device";
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break;
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case DEVICE_TYPE_TUNIFHEAD:
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#ifdef TUNSIFHEAD
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{
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const int one = 1;
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if(ioctl(device_fd, TUNSIFHEAD, &one, sizeof one) == -1) {
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logger(LOG_ERR, "System call `%s' failed: %s", "ioctl", strerror(errno));
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return false;
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}
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}
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#endif
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#if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
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{
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const int mode = IFF_BROADCAST | IFF_MULTICAST;
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ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
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}
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#endif
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device_info = "Generic BSD tun device";
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break;
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case DEVICE_TYPE_TAP:
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if(routing_mode == RMODE_ROUTER)
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overwrite_mac = true;
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device_info = "Generic BSD tap device";
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#ifdef TAPGIFNAME
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{
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struct ifreq ifr;
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if(ioctl(device_fd, TAPGIFNAME, (void*)&ifr) == 0) {
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if(iface)
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free(iface);
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iface = xstrdup(ifr.ifr_name);
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}
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}
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#endif
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break;
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#ifdef HAVE_TUNEMU
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case DEVICE_TYPE_TUNEMU:
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device_info = "BSD tunemu device";
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break;
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#endif
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}
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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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switch(device_type) {
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#ifdef HAVE_TUNEMU
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case DEVICE_TYPE_TUNEMU:
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tunemu_close(device_fd);
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break;
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#endif
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default:
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close(device_fd);
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}
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free(device);
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free(iface);
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}
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bool read_packet(vpn_packet_t *packet) {
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int lenin;
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switch(device_type) {
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case DEVICE_TYPE_TUN:
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#ifdef HAVE_TUNEMU
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case DEVICE_TYPE_TUNEMU:
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if(device_type == DEVICE_TYPE_TUNEMU)
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lenin = tunemu_read(device_fd, packet->data + 14, MTU - 14);
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else
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#endif
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lenin = read(device_fd, packet->data + 14, MTU - 14);
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if(lenin <= 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(packet->data[14] >> 4) {
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case 4:
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packet->data[12] = 0x08;
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packet->data[13] = 0x00;
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break;
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case 6:
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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 IP version %d while reading packet from %s %s",
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packet->data[14] >> 4, device_info, device);
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return false;
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}
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packet->len = lenin + 14;
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break;
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case DEVICE_TYPE_TUNIFHEAD: {
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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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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] = 0x08;
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packet->data[13] = 0x00;
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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 %x 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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break;
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}
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case DEVICE_TYPE_TAP:
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if((lenin = read(device_fd, packet->data, MTU)) <= 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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packet->len = lenin;
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break;
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default:
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return false;
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}
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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",
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packet->len, 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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ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
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packet->len, device_info);
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switch(device_type) {
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case DEVICE_TYPE_TUN:
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if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
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logger(LOG_ERR, "Error while writing to %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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break;
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case DEVICE_TYPE_TUNIFHEAD: {
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u_int32_t type;
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struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, packet->len - 14}};
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int af;
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af = (packet->data[12] << 8) + packet->data[13];
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switch (af) {
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case 0x0800:
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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 %x 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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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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break;
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}
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case DEVICE_TYPE_TAP:
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if(write(device_fd, packet->data, packet->len) < 0) {
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logger(LOG_ERR, "Error while writing to %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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break;
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#ifdef HAVE_TUNEMU
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case DEVICE_TYPE_TUNEMU:
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if(tunemu_write(device_fd, packet->data + 14, packet->len - 14) < 0) {
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logger(LOG_ERR, "Error while writing to %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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break;
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#endif
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default:
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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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logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
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logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
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logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
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}
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