tinc/src/mingw/device.c

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/*
device.c -- Interaction with Windows tap driver in a MinGW environment
Copyright (C) 2002-2005 Ivo Timmermans,
2002-2009 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#include <windows.h>
#include <winioctl.h>
#include "conf.h"
#include "logger.h"
#include "net.h"
#include "route.h"
#include "utils.h"
#include "xalloc.h"
#include "mingw/common.h"
int device_fd = -1;
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static HANDLE device_handle = INVALID_HANDLE_VALUE;
char *device = NULL;
char *iface = NULL;
static char *device_info = NULL;
static uint64_t device_total_in = 0;
static uint64_t device_total_out = 0;
extern char *myport;
static DWORD WINAPI tapreader(void *bla) {
int status;
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long len;
OVERLAPPED overlapped;
vpn_packet_t packet;
logger(LOG_DEBUG, "Tap reader running");
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/* Read from tap device and send to parent */
overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
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for(;;) {
overlapped.Offset = 0;
overlapped.OffsetHigh = 0;
ResetEvent(overlapped.hEvent);
status = ReadFile(device_handle, packet.data, MTU, &len, &overlapped);
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if(!status) {
if(GetLastError() == ERROR_IO_PENDING) {
WaitForSingleObject(overlapped.hEvent, INFINITE);
if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE))
continue;
} else {
logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
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device, strerror(errno));
return -1;
}
}
EnterCriticalSection(&mutex);
packet.len = len;
packet.priority = 0;
route(myself, &packet);
LeaveCriticalSection(&mutex);
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}
}
bool setup_device(void) {
HKEY key, key2;
int i;
char regpath[1024];
char adapterid[1024];
char adaptername[1024];
char tapname[1024];
long len;
unsigned long status;
bool found = false;
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int sock, err;
HANDLE thread;
struct addrinfo *ai;
struct addrinfo hint = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_protocol = IPPROTO_TCP,
.ai_flags = 0,
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};
get_config_string(lookup_config(config_tree, "Device"), &device);
get_config_string(lookup_config(config_tree, "Interface"), &iface);
/* Open registry and look for network adapters */
if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
logger(LOG_ERR, "Unable to read registry: %s", winerror(GetLastError()));
return false;
}
for (i = 0; ; i++) {
len = sizeof(adapterid);
if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
break;
/* Find out more about this adapter */
snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid);
if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
continue;
len = sizeof(adaptername);
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err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
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RegCloseKey(key2);
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if(err)
continue;
if(device) {
if(!strcmp(device, adapterid)) {
found = true;
break;
} else
continue;
}
if(iface) {
if(!strcmp(iface, adaptername)) {
found = true;
break;
} else
continue;
}
snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
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device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
if(device_handle != INVALID_HANDLE_VALUE) {
found = true;
break;
}
}
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RegCloseKey(key);
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if(!found) {
logger(LOG_ERR, "No Windows tap device found!");
return false;
}
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if(!device)
device = xstrdup(adapterid);
if(!iface)
iface = xstrdup(adaptername);
/* Try to open the corresponding tap device */
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if(device_handle == INVALID_HANDLE_VALUE) {
snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
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device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
}
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if(device_handle == INVALID_HANDLE_VALUE) {
logger(LOG_ERR, "%s (%s) is not a usable Windows tap device: %s", device, iface, winerror(GetLastError()));
return false;
}
/* Get MAC address from tap device */
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if(!DeviceIoControl(device_handle, TAP_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0)) {
logger(LOG_ERR, "Could not get MAC address from Windows tap device %s (%s): %s", device, iface, winerror(GetLastError()));
return false;
}
if(routing_mode == RMODE_ROUTER) {
overwrite_mac = 1;
}
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/* Start the tap reader */
thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL);
if(!thread) {
logger(LOG_ERR, "System call `%s' failed: %s", "CreateThread", winerror(GetLastError()));
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return false;
}
/* Set media status for newer TAP-Win32 devices */
status = true;
DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL);
device_info = "Windows tap device";
logger(LOG_INFO, "%s (%s) is a %s", device, iface, device_info);
return true;
}
void close_device(void) {
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CloseHandle(device_handle);
free(device);
free(iface);
}
bool read_packet(vpn_packet_t *packet) {
return false;
}
bool write_packet(vpn_packet_t *packet) {
long lenout;
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OVERLAPPED overlapped = {0};
ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
packet->len, device_info);
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if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
logger(LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(GetLastError()));
return false;
}
device_total_out += packet->len;
return true;
}
void dump_device_stats(void) {
logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
}