/*
- device.c -- Stub for Cygwin environment
- Copyright (C) 2002 Ivo Timmermans <ivo@o2w.nl>,
- 2002 Guus Sliepen <guus@sliepen.eu.org>
+ device.c -- Interaction with Windows tap driver in a Cygwin environment
+ Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
+ 2002-2003 Guus Sliepen <guus@sliepen.eu.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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: device.c,v 1.1.2.2 2002/09/09 21:25:18 guus Exp $
+ $Id: device.c,v 1.1.2.12 2003/07/29 11:06:23 guus Exp $
*/
-#include "config.h"
+#include "system.h"
-#include <stdio.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <syslog.h>
-#include <string.h>
+#include <w32api/windows.h>
+#include <w32api/winioctl.h>
-#include <utils.h>
#include "conf.h"
+#include "logger.h"
#include "net.h"
-#include "subnet.h"
+#include "route.h"
+#include "utils.h"
+#include "xalloc.h"
-#include "system.h"
+#define NETCARD_REG_KEY_2000 "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
+#define NETCARD_REG_KEY "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards"
+#define REG_SERVICE_KEY "SYSTEM\\CurrentControlSet\\Services"
+#define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
+
+#define USERMODEDEVICEDIR "\\\\.\\"
+#define SYSDEVICEDIR "\\Device\\"
+#define USERDEVICEDIR "\\??\\"
+#define TAPSUFFIX ".tap"
+
+#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)
+
+#define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
+#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
+#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
+
+/* FIXME: This only works for Windows 2000 */
+#define OSTYPE 5
int device_fd = -1;
-int device_type;
-char *device;
-char *interface;
-char *device_info;
+char *device = NULL;
+char *iface = NULL;
+char *device_info = NULL;
int device_total_in = 0;
int device_total_out = 0;
-extern subnet_t mymac;
+HANDLE handle;
+
+pid_t reader_pid;
+int sp[2];
-int setup_device(void)
+bool setup_device(void)
{
- struct ifreq ifr;
+ HKEY key, key2;
+ int i;
+
+ char regpath[1024];
+ char adapterid[1024];
+ char adaptername[1024];
+ char tapname[1024];
+ char gelukt = 0;
+ long len;
+
+ bool found = false;
- cp if(!get_config_string(lookup_config(config_tree, "Device"), &device))
- device = DEFAULT_DEVICE;
+ cp();
- if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
- interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
- cp if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
- syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
- return -1;
+ 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, REG_CONTROL_NET, 0, KEY_READ, &key)) {
+ logger(LOG_ERR, _("Unable to read registry"));
+ return false;
}
- cp
- /* Set default MAC address for ethertap devices */
- mymac.type = SUBNET_MAC;
- mymac.net.mac.address.x[0] = 0xfe;
- mymac.net.mac.address.x[1] = 0xfd;
- mymac.net.mac.address.x[2] = 0x00;
- mymac.net.mac.address.x[3] = 0x00;
- mymac.net.mac.address.x[4] = 0x00;
- mymac.net.mac.address.x[5] = 0x00;
-
- device_info = _("Stub device for Cygwin environment");
-
- syslog(LOG_INFO, _("%s is a %s"), device, device_info);
- cp return 0;
+
+ for (i = 0; ; i++) {
+ len = sizeof(adapterid);
+ if(RegEnumKeyEx(key, i, adapterid, &len, 0, 0, 0, NULL))
+ break;
+
+ if(device) {
+ if(!strcmp(device, adapterid)) {
+ found = true;
+ break;
+ } else
+ continue;
+ }
+
+ /* Find out more about this adapter */
+
+ snprintf(regpath, sizeof(regpath), "%s\\%s\\Connection", REG_CONTROL_NET, adapterid);
+
+ if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2)) {
+ logger(LOG_ERR, _("Unable to read registry"));
+ return false;
+ }
+
+ len = sizeof(adaptername);
+ RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
+
+ if(iface) {
+ if(!strcmp(iface, adaptername)) {
+ found = true;
+ break;
+ } else
+ continue;
+ }
+
+ snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
+ handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
+ if(handle != INVALID_HANDLE_VALUE) {
+ CloseHandle(handle);
+ found = true;
+ break;
+ }
+ }
+
+ if(!found) {
+ logger(LOG_ERR, _("No Windows tap device found!"));
+ return false;
+ }
+
+ device = adapterid;
+ iface = adaptername;
+
+ snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device);
+
+ /* Now we are going to open this device twice: once for reading and once for writing.
+ We do this because apparently it isn't possible to check for activity in the select() loop.
+ Furthermore I don't really know how to do it the "Windows" way. */
+
+ if(socketpair(AF_UNIX, SOCK_DGRAM, PF_UNIX, sp)) {
+ logger(LOG_DEBUG, _("System call `%s' failed: %s"), "socketpair", strerror(errno));
+ return false;
+ }
+
+ /* The parent opens the tap device for writing. */
+
+ handle = CreateFile(tapname, GENERIC_WRITE, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM , 0);
+
+ if(handle == INVALID_HANDLE_VALUE) {
+ logger(LOG_ERR, _("Could not open Windows tap device for writing!"));
+ return false;
+ }
+
+ device_fd = sp[0];
+
+ /* Get MAC address from tap device */
+
+ if(DeviceIoControl(device_fd, 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!"));
+ return false;
+ }
+
+ if(routing_mode == RMODE_ROUTER) {
+ overwrite_mac = 1;
+ }
+
+ /* Now we start the child */
+
+ reader_pid = fork();
+
+ if(reader_pid == -1) {
+ logger(LOG_DEBUG, _("System call `%s' failed: %s"), "fork", strerror(errno));
+ return false;
+ }
+
+ if(!reader_pid) {
+ /* The child opens the tap device for reading, blocking.
+ It passes everything it reads to the socket. */
+
+ char buf[MTU];
+ int lenin;
+
+ handle = CreateFile(tapname, GENERIC_READ, FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM , 0);
+
+ if(handle == INVALID_HANDLE_VALUE) {
+ logger(LOG_ERR, _("Could not open Windows tap device for reading!"));
+ buf[0] = 0;
+ write(sp[1], buf, 1);
+ exit(1);
+ }
+
+ logger(LOG_DEBUG, _("Tap reader forked and running."));
+
+ /* Notify success */
+
+ buf[0] = 1;
+ write(sp[1], buf, 1);
+
+ /* Pass packets */
+
+ for(;;) {
+ ReadFile (handle, buf, MTU, &lenin, NULL);
+ write(sp[1], buf, lenin);
+ }
+ }
+
+ read(device_fd, &gelukt, 1);
+ if(gelukt != 1) {
+ logger(LOG_DEBUG, _("Tap reader failed!"));
+ return false;
+ }
+
+ if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
+ iface = device;
+
+ device_info = _("Windows tap device");
+
+ logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info);
+
+ return false;
}
void close_device(void)
{
- cp close(device_fd);
+ cp();
+
+ close(sp[0]);
+ close(sp[1]);
+ CloseHandle(handle);
+
+ kill(reader_pid, SIGKILL);
}
-int read_packet(vpn_packet_t * packet)
+bool read_packet(vpn_packet_t *packet)
{
int lenin;
- cp if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
- syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
+
+ cp();
+
+ if((lenin = read(sp[0], packet->data, MTU)) <= 0) {
+ logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
device, strerror(errno));
- return -1;
+ return false;
}
-
+
packet->len = lenin;
device_total_in += packet->len;
- if(debug_lvl >= DEBUG_TRAFFIC) {
- syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
device_info);
- }
- return 0;
-cp}
+ return true;
+}
-int write_packet(vpn_packet_t * packet)
+bool write_packet(vpn_packet_t *packet)
{
- cp if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
+ int lenout;
+
+ cp();
+
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
packet->len, device_info);
- if(write(device_fd, packet->data, packet->len) < 0) {
- syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
- strerror(errno));
- return -1;
+ if(!WriteFile (handle, packet->data, packet->len, &lenout, NULL)) {
+ logger(LOG_ERR, _("Error while writing to %s %s"), device_info, device);
+ return false;
}
device_total_out += packet->len;
- cp return 0;
+
+ return true;
}
void dump_device_stats(void)
{
- cp syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
- syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
- syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
-cp}
+ cp();
+
+ logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
+ logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
+ logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
+}
projects / tinc / blobdiff