+++ /dev/null
-/*
- device.c -- Interaction with Windows tap driver in a Cygwin environment
- Copyright (C) 2002-2005 Ivo Timmermans,
- 2002-2014 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
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- 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.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-
-#include "../system.h"
-#include "../net.h"
-
-#include <w32api/windows.h>
-#include <w32api/winioctl.h>
-
-#include "../conf.h"
-#include "../device.h"
-#include "../logger.h"
-#include "../names.h"
-#include "../route.h"
-#include "../utils.h"
-#include "../xalloc.h"
-
-#include "../mingw/common.h"
-
-int device_fd = -1;
-static HANDLE device_handle = INVALID_HANDLE_VALUE;
-char *device = NULL;
-char *iface = NULL;
-static const char *device_info = "Windows tap device";
-
-static pid_t reader_pid;
-static int sp[2];
-
-static bool setup_device(void) {
- HKEY key, key2;
- int i, err;
-
- char regpath[1024];
- char adapterid[1024];
- char adaptername[1024];
- char tapname[1024];
- char gelukt = 0;
- long len;
-
- bool found = false;
-
- get_config_string(lookup_config(config_tree, "Device"), &device);
- get_config_string(lookup_config(config_tree, "Interface"), &iface);
-
- if(device && iface) {
- logger(LOG_WARNING, "Warning: both Device and Interface specified, results may not be as expected");
- }
-
- /* Open registry and look for network adapters */
-
- if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) {
- logger(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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 inlen;
-
- 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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, &inlen, NULL);
- write(sp[1], buf, inlen);
- }
- }
-
- read(device_fd, &gelukt, 1);
-
- if(gelukt != 1) {
- logger(DEBUG_ALWAYS, LOG_DEBUG, "Tap reader failed!");
- return false;
- }
-
- logger(DEBUG_ALWAYS, LOG_INFO, "%s (%s) is a %s", device, iface, device_info);
-
- return true;
-}
-
-static void close_device(void) {
- close(sp[0]);
- close(sp[1]);
- CloseHandle(device_handle);
- device_handle = INVALID_HANDLE_VALUE;
-
- kill(reader_pid, SIGKILL);
-
- free(device);
- device = NULL;
- free(iface);
- iface = NULL;
- device_info = NULL;
-}
-
-static bool read_packet(vpn_packet_t *packet) {
- int inlen;
-
- if((inlen = read(sp[0], DATA(packet), MTU)) <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
- device, strerror(errno));
- return false;
- }
-
- packet->len = inlen;
-
- logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
- device_info);
-
- return true;
-}
-
-static bool write_packet(vpn_packet_t *packet) {
- long outlen;
-
- logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
- packet->len, device_info);
-
- if(!WriteFile(device_handle, DATA(packet), packet->len, &outlen, NULL)) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while writing to %s %s: %s", device_info, device, winerror(GetLastError()));
- return false;
- }
-
- return true;
-}
-
-const devops_t os_devops = {
- .setup = setup_device,
- .close = close_device,
- .read = read_packet,
- .write = write_packet,
-};
projects / oweals / tinc.git / blobdiff