X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fcygwin%2Fdevice.c;h=1165d675cf5281d14fa36e05744b266ae88f83e7;hp=9b06d4d15ae2c029ecc6ba84536cf09c004f64f6;hb=061c3fcaf9c63978009dc2707071f8daef8751b2;hpb=12de5a8eedd985f4732e88de6185f77a8244612c diff --git a/src/cygwin/device.c b/src/cygwin/device.c index 9b06d4d1..1165d675 100644 --- a/src/cygwin/device.c +++ b/src/cygwin/device.c @@ -1,7 +1,7 @@ /* - device.c -- Stub for Cygwin environment - Copyright (C) 2002 Ivo Timmermans , - 2002 Guus Sliepen + device.c -- Interaction with Windows tap driver in a Cygwin environment + Copyright (C) 2002-2005 Ivo Timmermans, + 2002-2016 Guus Sliepen 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 @@ -13,119 +13,275 @@ 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 1.1.2.5 2003/06/11 19:28:36 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 -#include -#include -#include -#include -#include -#include -#include +#include +#include -#include -#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]; + +static bool setup_device(void) { + HKEY key, key2; + int i, err; -int device_total_in = 0; -int device_total_out = 0; + 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(); + 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, "Device"), &device)) - device = DEFAULT_DEVICE; + if(device && iface) { + logger(LOG_WARNING, "Warning: both Device and Interface specified, results may not be as expected"); + } - if(!get_config_string(lookup_config(config_tree, "Interface"), &interface)) - interface = rindex(device, '/') ? rindex(device, '/') + 1 : device; + /* Open registry and look for network adapters */ - if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) { - syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno)); - return -1; + if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key)) { + logger(LOG_ERR, "Unable to read registry: %s", winerror(GetLastError())); + return false; } - device_info = _("Stub device for Cygwin environment"); + 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); - syslog(LOG_INFO, _("%s is a %s"), device, device_info); + 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; + } - return 0; + 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(); +static void close_device(void) { + close(sp[0]); + close(sp[1]); + CloseHandle(device_handle); - close(device_fd); + 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 0; + return true; } -int write_packet(vpn_packet_t *packet) -{ - cp(); +static bool write_packet(vpn_packet_t *packet) { + long lenout; - 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; - 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); +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); } + +const devops_t os_devops = { + .setup = setup_device, + .close = close_device, + .read = read_packet, + .write = write_packet, + .dump_stats = dump_device_stats, +};