1 |
pcg |
1.1 |
/* |
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device.c -- Interaction with Windows tap driver in a MinGW environment |
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pcg |
1.2 |
Copyright (C) 2002-2004 Ivo Timmermans <ivo@tinc-vpn.org>, |
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2002-2004 Guus Sliepen <guus@tinc-vpn.org> |
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pcg |
1.1 |
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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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pcg |
1.2 |
$Id: device.c 1400 2004-11-01 17:02:19Z guus $ |
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pcg |
1.1 |
*/ |
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pcg |
1.2 |
#include "system.h" |
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pcg |
1.1 |
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#include <windows.h> |
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#include <winioctl.h> |
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pcg |
1.2 |
#include "tincd/mingw/common.h" |
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pcg |
1.1 |
|
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int device_fd = 0; |
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pcg |
1.2 |
static HANDLE device_handle = INVALID_HANDLE_VALUE; |
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pcg |
1.1 |
char *device = NULL; |
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char *iface = NULL; |
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char *device_info = NULL; |
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pcg |
1.2 |
static int device_total_in = 0; |
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static int device_total_out = 0; |
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pcg |
1.1 |
|
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extern char *myport; |
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DWORD WINAPI tapreader(void *bla) { |
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int sock, err, status; |
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struct addrinfo *ai; |
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struct addrinfo hint = { |
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.ai_family = AF_UNSPEC, |
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.ai_socktype = SOCK_DGRAM, |
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.ai_protocol = IPPROTO_UDP, |
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.ai_flags = 0, |
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}; |
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char buf[MTU]; |
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long len; |
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OVERLAPPED overlapped; |
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/* Open a socket to the parent process */ |
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err = getaddrinfo(NULL, myport, &hint, &ai); |
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if(err || !ai) { |
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logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno)); |
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return -1; |
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} |
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sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
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freeaddrinfo(ai); |
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if(sock < 0) { |
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logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno)); |
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return -1; |
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} |
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if(connect(sock, ai->ai_addr, ai->ai_addrlen)) { |
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logger(LOG_ERR, _("System call `%s' failed: %s"), "connect", strerror(errno)); |
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return -1; |
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} |
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logger(LOG_DEBUG, _("Tap reader running")); |
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/* Read from tap device and send to parent */ |
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overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); |
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for(;;) { |
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overlapped.Offset = 0; |
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overlapped.OffsetHigh = 0; |
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ResetEvent(overlapped.hEvent); |
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status = ReadFile(device_handle, buf, sizeof(buf), &len, &overlapped); |
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if(!status) { |
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if(GetLastError() == ERROR_IO_PENDING) { |
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WaitForSingleObject(overlapped.hEvent, INFINITE); |
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if(!GetOverlappedResult(device_handle, &overlapped, &len, FALSE)) |
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continue; |
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} else { |
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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 -1; |
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} |
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} |
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if(send(sock, buf, len, 0) <= 0) |
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return -1; |
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} |
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} |
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bool setup_device(void) |
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{ |
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HKEY key, key2; |
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int i; |
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char regpath[1024]; |
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char adapterid[1024]; |
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char adaptername[1024]; |
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char tapname[1024]; |
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long len; |
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pcg |
1.2 |
unsigned long status; |
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pcg |
1.1 |
|
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bool found = false; |
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int sock, err; |
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HANDLE thread; |
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struct addrinfo *ai; |
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struct addrinfo hint = { |
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.ai_family = AF_UNSPEC, |
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.ai_socktype = SOCK_DGRAM, |
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.ai_protocol = IPPROTO_UDP, |
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.ai_flags = 0, |
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}; |
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cp(); |
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get_config_string(lookup_config(config_tree, "Device"), &device); |
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get_config_string(lookup_config(config_tree, "Interface"), &iface); |
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/* Open registry and look for network adapters */ |
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pcg |
1.2 |
if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) { |
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pcg |
1.1 |
logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError())); |
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return false; |
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} |
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for (i = 0; ; i++) { |
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len = sizeof(adapterid); |
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if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL)) |
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break; |
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/* Find out more about this adapter */ |
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pcg |
1.2 |
snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", NETWORK_CONNECTIONS_KEY, adapterid); |
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pcg |
1.1 |
|
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if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2)) |
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continue; |
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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) |
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continue; |
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if(device) { |
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if(!strcmp(device, adapterid)) { |
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found = true; |
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break; |
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} else |
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continue; |
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} |
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if(iface) { |
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if(!strcmp(iface, adaptername)) { |
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found = true; |
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break; |
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} else |
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continue; |
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} |
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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); |
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if(device_handle != INVALID_HANDLE_VALUE) { |
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found = true; |
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break; |
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} |
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} |
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RegCloseKey(key); |
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if(!found) { |
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logger(LOG_ERR, _("No Windows tap device found!")); |
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return false; |
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} |
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if(!device) |
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device = xstrdup(adapterid); |
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if(!iface) |
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iface = xstrdup(adaptername); |
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/* Try to open the corresponding tap device */ |
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if(device_handle == INVALID_HANDLE_VALUE) { |
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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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} |
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if(device_handle == INVALID_HANDLE_VALUE) { |
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logger(LOG_ERR, _("%s (%s) is not a usable Windows tap device: %s"), device, iface, winerror(GetLastError())); |
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return false; |
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} |
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/* 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)) { |
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logger(LOG_ERR, _("Could not get MAC address from Windows tap device %s (%s): %s"), device, iface, winerror(GetLastError())); |
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return false; |
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} |
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if(routing_mode == RMODE_ROUTER) { |
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overwrite_mac = 1; |
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} |
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/* Create a listening socket */ |
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err = getaddrinfo(NULL, myport, &hint, &ai); |
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if(err || !ai) { |
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logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo", gai_strerror(errno)); |
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return false; |
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} |
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sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); |
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if(sock < 0) { |
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logger(LOG_ERR, _("System call `%s' failed: %s"), "socket", strerror(errno)); |
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return false; |
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} |
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if(bind(sock, ai->ai_addr, ai->ai_addrlen)) { |
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logger(LOG_ERR, _("System call `%s' failed: %s"), "bind", strerror(errno)); |
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return false; |
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} |
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freeaddrinfo(ai); |
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if(listen(sock, 1)) { |
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logger(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno)); |
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return false; |
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} |
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/* Start the tap reader */ |
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thread = CreateThread(NULL, 0, tapreader, NULL, 0, NULL); |
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if(!thread) { |
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logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError())); |
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return false; |
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} |
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261 |
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/* Wait for the tap reader to connect back to us */ |
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if((device_fd = accept(sock, NULL, 0)) == -1) { |
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logger(LOG_ERR, _("System call `%s' failed: %s"), "accept", strerror(errno)); |
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return false; |
266 |
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} |
267 |
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268 |
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closesocket(sock); |
269 |
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270 |
pcg |
1.2 |
/* Set media status for newer TAP-Win32 devices */ |
271 |
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272 |
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status = true; |
273 |
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DeviceIoControl(device_handle, TAP_IOCTL_SET_MEDIA_STATUS, &status, sizeof(status), &status, sizeof(status), &len, NULL); |
274 |
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275 |
pcg |
1.1 |
device_info = _("Windows tap device"); |
276 |
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277 |
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logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info); |
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return true; |
280 |
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} |
281 |
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282 |
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void close_device(void) |
283 |
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{ |
284 |
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cp(); |
285 |
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286 |
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CloseHandle(device_handle); |
287 |
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} |
288 |
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289 |
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bool read_packet(vpn_packet_t *packet) |
290 |
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{ |
291 |
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int lenin; |
292 |
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293 |
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cp(); |
294 |
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295 |
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if((lenin = recv(device_fd, packet->data, MTU, 0)) <= 0) { |
296 |
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logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info, |
297 |
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device, strerror(errno)); |
298 |
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return false; |
299 |
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} |
300 |
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301 |
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packet->len = lenin; |
302 |
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303 |
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device_total_in += packet->len; |
304 |
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305 |
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len, |
306 |
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device_info); |
307 |
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308 |
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return true; |
309 |
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} |
310 |
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311 |
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bool write_packet(vpn_packet_t *packet) |
312 |
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{ |
313 |
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long lenout; |
314 |
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OVERLAPPED overlapped = {0}; |
315 |
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316 |
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cp(); |
317 |
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318 |
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"), |
319 |
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packet->len, device_info); |
320 |
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321 |
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if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) { |
322 |
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logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError())); |
323 |
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return false; |
324 |
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} |
325 |
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326 |
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device_total_out += packet->len; |
327 |
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328 |
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return true; |
329 |
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} |
330 |
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331 |
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void dump_device_stats(void) |
332 |
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{ |
333 |
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cp(); |
334 |
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335 |
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logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device); |
336 |
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logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in); |
337 |
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logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out); |
338 |
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} |