Make use of the CIPE driver. Woohoo, tinc for Windows!

src/cygwin/device.c

@@ -1,5 +1,5 @@
 /*
-    device.c -- Stub for Cygwin environment
+    device.c -- Interaction with CIPE driver in a Cygwin environment
     Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
                   2002-2003 Guus Sliepen <guus@sliepen.eu.org>
 
@@ -17,53 +17,234 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: device.c,v 1.1.2.7 2003/07/12 17:41:47 guus Exp $
+    $Id: device.c,v 1.1.2.8 2003/07/15 16:27:39 guus Exp $
 */
 
 #include "config.h"
 
 #include <stdio.h>
+#include <stdbool.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <signal.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <string.h>
+#include <w32api/windows.h>
+#include <w32api/winioctl.h>
 
-#include <utils.h>
+// #include <utils.h>
 #include "conf.h"
 #include "net.h"
 #include "logger.h"
+#include "route.h"
 
 #include "system.h"
 
+/* Definitions from CIPE */
+
+#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 USERMODEDEVICEDIR "\\\\.\\"
+#define SYSDEVICEDIR  "\\Device\\"
+#define USERDEVICEDIR "\\??\\"
+#define TAPSUFFIX     ".tap"
+
+#define PRODUCT_STRING "DKW Heavy Industries VPN Adapter."
+#define CIPE_SERVICE_NAME "CIPE_Daemon"
+#define CIPE_DRIVER_NAME "CIPE"
+
+#define CIPE_NDIS_MAJOR_VERSION 4
+#define CIPE_NDIS_MINOR_VERSION 0
+
+#ifndef CIPE_DRIVER_MAJOR_VERSION
+#   define CIPE_DRIVER_MAJOR_VERSION 2
+#endif
+
+#ifndef CIPE_DRIVER_MINOR_VERSION
+#   define CIPE_DRIVER_MINOR_VERSION 1
+#endif
+
+#ifndef CIPE_MAC_ROOT_ADDRESS
+#   define CIPE_MAC_ROOT_ADDRESS "8:0:58:0:0:1"
+#endif
+
+#define CIPE_CONTROL_CODE(request,method) CTL_CODE (FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)
+
+#define CIPE_IOCTL_GET_LASTMAC    CIPE_CONTROL_CODE (0, METHOD_BUFFERED)
+#define CIPE_IOCTL_GET_MAC        CIPE_CONTROL_CODE (1, METHOD_BUFFERED)
+#define CIPE_IOCTL_SET_STATISTICS CIPE_CONTROL_CODE (2, METHOD_BUFFERED)
+
+/* Windows 2000 */
+#define OSTYPE 5
+
 int device_fd = -1;
-int device_type;
+char *device = NULL;
-char *device;
+char *iface = NULL;
-char *interface;
+char *device_info = NULL;
-char *device_info;
 
 int device_total_in = 0;
 int device_total_out = 0;
 
+HANDLE handle;
+
+pid_t reader_pid;
+int sp[2];
+
 int setup_device(void)
 {
-	struct ifreq ifr;
+	HKEY key, key2, adapterkey;
+	int i;
+
+	char adapterid[1024];
+	char manufacturer[1024];
+	char productname[1024];
+	char adaptername[1024];
+	char tapname[1024];
+	char gelukt = 0;
+	long len;
+
+	FILETIME filetime;
+	bool found = false;
 
 	cp();
 
-	if(!get_config_string(lookup_config(config_tree, "Device"), &device))
+	get_config_string(lookup_config(config_tree, "Device"), &device);
-		device = DEFAULT_DEVICE;
 
-	if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
+	/* Open registry and look for network adapters */
-		interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
 
-	if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
+	if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, (OSTYPE > 4 ? NETCARD_REG_KEY_2000 : NETCARD_REG_KEY), 0, KEY_READ, &key)) {
-		logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
+		logger(LOG_ERR, _("Unable to read registry"));
 		return -1;
 	}
 
-	device_info = _("Stub device for Cygwin environment");
+	for (i = 0; ; i++) {
+		len = sizeof(adapterid);
+		if(RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, &filetime))
+			break;
+
+		/* Find out more about this adapter */
+
+                if(RegOpenKeyEx (key, adapterid, 0, KEY_READ, &adapterkey)) {
+			logger(LOG_ERR, _("Unable to read registry"));
+			return -1;
+		}
+
+		len = sizeof(productname);
+		if(RegQueryValueEx(adapterkey, "ProductName", 0, 0, productname, &len))
+			goto skip;
+
+		len = sizeof(manufacturer);
+		if(RegQueryValueEx(adapterkey, "Manufacturer", 0, 0, manufacturer, &len))
+			goto skip;
+
+		if(!strcmp(productname, "CIPE") && !strcmp(manufacturer, "DKWHeavyIndustries")) {
+			if(device && strcmp(adapterid, device))
+				continue;
+			if(!device)
+				device = xstrdup(adapterid);
+			found = true;
+			break;
+		}
+		
+skip:
+                RegCloseKey (adapterkey);
+	}
+
+	if(!found) {
+		logger(LOG_ERR, _("No CIPE adapters found!"));
+		return -1;
+	}
+
+	/* Get adapter name */
+
+	len = sizeof(adaptername);
+	RegQueryValueEx(adapterkey, (OSTYPE > 4 ? "NetCfgInstanceId" : "ServiceName"), 0, 0, adaptername, &len);
+
+	/* FIXME? cipsrvr checks if the device is in use at this point */
+
+	/* Try to open the corresponding tap device */
+
+	snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adaptername);
+	
+	/* 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 -1;
+	}
+
+	reader_pid = fork();
+
+	if(reader_pid == -1) {
+		logger(LOG_DEBUG, _("System call `%s' failed: %s"), "fork", strerror(errno));
+		return -1;
+	}
+
+	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 CIPE 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);
+		}
+	}
+
+	/* 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 CIPE tap device for writing!"));
+		return -1;
+	}
+
+	device_fd = sp[0];
+
+	/* Get MAC address from tap device */
+
+	if(routing_mode == RMODE_ROUTER) {
+		DeviceIoControl (handle, CIPE_IOCTL_GET_MAC, mymac.x, sizeof(mymac.x), mymac.x, sizeof(mymac.x), &len, 0);
+		overwrite_mac = 1;
+	}
+
+	read(device_fd, &gelukt, 1);
+	if(gelukt != 1) {
+		logger(LOG_DEBUG, "Tap reader failed!");
+		return -1;
+	}
+
+	if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
+		iface = device;
+
+	device_info = _("Cygwin CIPE device");
 
 	logger(LOG_INFO, _("%s is a %s"), device, device_info);
 
@@ -74,7 +255,11 @@ void close_device(void)
 {
 	cp();
 
-	close(device_fd);
+	close(sp[0]);
+	close(sp[1]);
+	CloseHandle(handle);
+
+	kill(reader_pid, SIGKILL);
 }
 
 int read_packet(vpn_packet_t *packet)
@@ -83,7 +268,7 @@ int read_packet(vpn_packet_t *packet)
 
 	cp();
 
-	if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
+	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;
@@ -101,14 +286,15 @@ int read_packet(vpn_packet_t *packet)
 
 int write_packet(vpn_packet_t *packet)
 {
+	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) {
+	if(!WriteFile (handle, packet->data, packet->len, &lenout, NULL)) {
-		logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
+		logger(LOG_ERR, "Error while writing to %s %s", device_info, device);
-			   strerror(errno));
 		return -1;
 	}