2003-07-28 21:54:03 +00:00
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/*
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2003-07-29 11:06:23 +00:00
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device.c -- Interaction with Windows tap driver in a MinGW environment
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2003-07-28 21:54:03 +00:00
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Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
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2002-2003 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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2003-08-02 21:33:19 +00:00
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$Id: device.c,v 1.1.2.10 2003/08/02 21:33:19 guus Exp $
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2003-07-28 21:54:03 +00:00
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*/
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#include "system.h"
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#include <windows.h>
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#include <winioctl.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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#define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
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#define USERMODEDEVICEDIR "\\\\.\\"
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#define USERDEVICEDIR "\\??\\"
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#define TAPSUFFIX ".tap"
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#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)
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#define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
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#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
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#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
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2003-07-29 22:59:01 +00:00
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int device_fd = 0;
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HANDLE device_handle = INVALID_HANDLE_VALUE;
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2003-07-28 21:54:03 +00:00
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char *device = NULL;
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char *iface = NULL;
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char *device_info = NULL;
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int device_total_in = 0;
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int device_total_out = 0;
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2003-07-29 22:59:01 +00:00
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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, "12345", &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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2003-07-28 21:54:03 +00:00
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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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bool found = false;
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2003-07-29 22:59:01 +00:00
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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 = AI_PASSIVE,
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};
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2003-07-28 21:54:03 +00:00
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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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if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key)) {
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2003-08-02 21:01:50 +00:00
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logger(LOG_ERR, _("Unable to read registry: %s"), winerror(GetLastError()));
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2003-07-28 21:54:03 +00:00
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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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snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", REG_CONTROL_NET, adapterid);
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2003-07-29 12:38:49 +00:00
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if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
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continue;
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2003-07-28 21:54:03 +00:00
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len = sizeof(adaptername);
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RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
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2003-08-01 08:18:22 +00:00
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RegCloseKey(key2);
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2003-07-29 23:21:01 +00:00
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2003-07-29 12:38:49 +00:00
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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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2003-07-28 21:54:03 +00:00
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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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2003-07-29 22:59:01 +00:00
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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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2003-07-28 21:54:03 +00:00
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found = true;
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break;
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}
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}
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2003-08-01 08:18:22 +00:00
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RegCloseKey(key);
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2003-07-29 23:21:01 +00:00
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2003-07-28 21:54:03 +00:00
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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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2003-07-29 22:59:01 +00:00
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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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2003-07-28 21:54:03 +00:00
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/* Try to open the corresponding tap device */
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2003-07-29 22:59:01 +00:00
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if(device_handle == INVALID_HANDLE_VALUE) {
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2003-07-28 21:54:03 +00:00
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snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
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2003-07-29 22:59:01 +00:00
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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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2003-07-28 21:54:03 +00:00
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}
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2003-07-29 22:59:01 +00:00
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if(device_handle == INVALID_HANDLE_VALUE) {
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2003-07-28 21:54:03 +00:00
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logger(LOG_ERR, _("%s (%s) is no a usable Windows tap device!"), device, iface);
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return false;
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}
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/* Get MAC address from tap device */
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2003-07-29 22:59:01 +00:00
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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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2003-07-28 21:54:03 +00:00
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logger(LOG_ERR, _("Could not get MAC address from Windows tap device!"));
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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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2003-07-29 22:59:01 +00:00
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/* Create a listening socket */
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err = getaddrinfo(NULL, "12345", &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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2003-08-02 21:01:50 +00:00
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logger(LOG_ERR, _("System call `%s' failed: %s"), "CreateThread", winerror(GetLastError()));
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2003-07-29 22:59:01 +00:00
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return false;
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}
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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;
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}
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closesocket(sock);
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2003-07-28 21:54:03 +00:00
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device_info = _("Windows tap device");
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logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, 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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2003-07-29 22:59:01 +00:00
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CloseHandle(device_handle);
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2003-07-28 21:54:03 +00:00
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}
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bool read_packet(vpn_packet_t *packet)
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{
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2003-07-29 22:59:01 +00:00
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int lenin;
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2003-07-28 21:54:03 +00:00
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cp();
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2003-07-29 22:59:01 +00:00
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if((lenin = recv(device_fd, packet->data, MTU, 0)) <= 0) {
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2003-07-28 21:54:03 +00:00
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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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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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2003-07-29 12:38:49 +00:00
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long lenout;
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2003-07-29 22:59:01 +00:00
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OVERLAPPED overlapped = {0};
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2003-07-28 21:54:03 +00:00
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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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2003-07-29 22:59:01 +00:00
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if(!WriteFile(device_handle, packet->data, packet->len, &lenout, &overlapped)) {
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2003-08-02 21:01:50 +00:00
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logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, winerror(GetLastError()));
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2003-07-28 21:54:03 +00:00
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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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}
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