X-Git-Url: https://git.librecmc.org/?p=oweals%2Ftinc.git;a=blobdiff_plain;f=src%2Fcygwin%2Fdevice.c;h=b7f49af4dd636403953dbcb45466466d6f1dfc7e;hp=3bfc2ab1e1540cf0fc4aae867efa1fc0b39e6bcb;hb=acf5f9c968d17ad3e31129d2184309de06d72eed;hpb=c01f78ed3603eecaec8e3649a3bfb3de9742fd24 diff --git a/src/cygwin/device.c b/src/cygwin/device.c index 3bfc2ab..b7f49af 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) 2002-2003 Ivo Timmermans , + 2002-2003 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 @@ -17,126 +17,274 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: device.c,v 1.1.2.4 2002/09/10 21:29:42 guus Exp $ + $Id: device.c,v 1.1.2.17 2003/10/08 11:37:20 guus Exp $ */ -#include "config.h" +#include "system.h" -#include -#include -#include -#include -#include -#include -#include -#include +#include +#include -#include #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 REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}" + +#define USERMODEDEVICEDIR "\\\\.\\" +#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) 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; +char *device_info = NULL; int device_total_in = 0; int device_total_out = 0; -extern subnet_t mymac; +pid_t reader_pid; +int sp[2]; -int setup_device(void) +bool setup_device(void) { - struct ifreq ifr; + 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; 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); + + /* 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: %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", REG_CONTROL_NET, 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; - if(!get_config_string(lookup_config(config_tree, "Interface"), &interface)) - interface = rindex(device, '/') ? rindex(device, '/') + 1 : device; + CloseHandle(device_handle); - if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) { - syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno)); - return -1; + 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); + } } - /* 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; + read(device_fd, &gelukt, 1); + if(gelukt != 1) { + logger(LOG_DEBUG, _("Tap reader failed!")); + return false; + } - device_info = _("Stub device for Cygwin environment"); + device_info = _("Windows tap device"); - syslog(LOG_INFO, _("%s is a %s"), device, device_info); + logger(LOG_INFO, _("%s (%s) is a %s"), device, iface, device_info); - return 0; + return true; } void close_device(void) { cp(); - close(device_fd); + close(sp[0]); + close(sp[1]); + CloseHandle(device_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, + 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; + return true; } -int write_packet(vpn_packet_t *packet) +bool write_packet(vpn_packet_t *packet) { + long lenout; + cp(); - if(debug_lvl >= DEBUG_TRAFFIC) - syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"), + 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); + 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); }