/*
- 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) 2002-2005 Ivo Timmermans,
+ 2002-2016 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
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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: device.c,v 1.1.2.2 2002/09/09 21:25:18 guus Exp $
+ 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 "config.h"
+#include "../system.h"
+#include "../net.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 "net.h"
-#include "subnet.h"
+#include "../conf.h"
+#include "../device.h"
+#include "../logger.h"
+#include "../route.h"
+#include "../utils.h"
+#include "../xalloc.h"
-#include "system.h"
+#include "../mingw/common.h"
int device_fd = -1;
-int device_type;
-char *device;
-char *interface;
-char *device_info;
+static HANDLE device_handle = INVALID_HANDLE_VALUE;
+char *device = NULL;
+char *iface = NULL;
+static const char *device_info = "Windows tap device";
+
+static uint64_t device_total_in = 0;
+static uint64_t device_total_out = 0;
+
+static pid_t reader_pid;
+static int sp[2];
-int device_total_in = 0;
-int device_total_out = 0;
+static bool setup_device(void) {
+ HKEY key, key2;
+ int i, err;
-extern subnet_t mymac;
+ char regpath[1024];
+ char adapterid[1024];
+ char adaptername[1024];
+ char tapname[1024];
+ char gelukt = 0;
+ long len;
-int setup_device(void)
-{
- struct ifreq ifr;
+ bool found = false;
- cp if(!get_config_string(lookup_config(config_tree, "Device"), &device))
- device = DEFAULT_DEVICE;
+ get_config_string(lookup_config(config_tree, "Device"), &device);
+ get_config_string(lookup_config(config_tree, "Interface"), &iface);
- 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;
+ if(device && iface) {
+ logger(LOG_WARNING, "Warning: both Device and Interface specified, results may not be as expected");
}
- 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;
+
+ /* 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);
+ err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
+
+ RegCloseKey(key2);
+
+ 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);
+ device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
+
+ if(device_handle != INVALID_HANDLE_VALUE) {
+ CloseHandle(device_handle);
+ found = true;
+ break;
+ }
+ }
+
+ RegCloseKey(key);
+
+ if(!found) {
+ logger(LOG_ERR, "No Windows tap device found!");
+ return false;
+ }
+
+ if(!device) {
+ device = xstrdup(adapterid);
+ }
+
+ if(!iface) {
+ iface = xstrdup(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. */
+
+ device_handle = CreateFile(tapname, GENERIC_WRITE, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
+
+ if(device_handle == INVALID_HANDLE_VALUE) {
+ logger(LOG_ERR, "Could not open Windows tap device %s (%s) for writing: %s", device, iface, winerror(GetLastError()));
+ return false;
+ }
+
+ device_fd = sp[0];
+
+ /* Get MAC address from tap device */
+
+ 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;
+ }
+
+ /* 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];
+ long lenin;
+
+ CloseHandle(device_handle);
+
+ device_handle = CreateFile(tapname, GENERIC_READ, FILE_SHARE_WRITE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM, 0);
+
+ if(device_handle == INVALID_HANDLE_VALUE) {
+ logger(LOG_ERR, "Could not open Windows tap device %s (%s) for reading: %s", device, iface, winerror(GetLastError()));
+ 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(device_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;
+ }
+
+ logger(LOG_INFO, "%s (%s) is a %s", device, iface, device_info);
+
+ return true;
}
-void close_device(void)
-{
- cp close(device_fd);
+static void close_device(void) {
+ close(sp[0]);
+ close(sp[1]);
+ CloseHandle(device_handle);
+
+ kill(reader_pid, SIGKILL);
+
+ free(device);
+ free(iface);
}
-int read_packet(vpn_packet_t * packet)
-{
+static 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,
- device, strerror(errno));
- return -1;
+
+ 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 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,
- device_info);
- }
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
+ device_info);
+
+ return true;
+}
- return 0;
-cp}
+static bool write_packet(vpn_packet_t *packet) {
+ long lenout;
-int write_packet(vpn_packet_t * packet)
-{
- cp if(debug_lvl >= DEBUG_TRAFFIC)
- syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
- packet->len, device_info);
+ 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(device_handle, packet->data, packet->len, &lenout, NULL)) {
+ logger(LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(GetLastError()));
+ return false;
}
device_total_out += packet->len;
- cp return 0;
+
+ return true;
+}
+
+static 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);
}
-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}
+const devops_t os_devops = {
+ .setup = setup_device,
+ .close = close_device,
+ .read = read_packet,
+ .write = write_packet,
+ .dump_stats = dump_device_stats,
+};
projects / tinc / blobdiff