| 1 | /* |
1 | /* |
| 2 | device-cygwin.C -- Stub for Cygwin environment |
2 | device-cygwin.C -- Stub for Cygwin environment |
| 3 | Copyright (C) 2003 Marc Lehmann <ocg@goof.com> |
3 | Copyright (C) 2003 Marc Lehmann <ocg@goof.com> |
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4 | Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>, |
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5 | 2002-2003 Guus Sliepen <guus@sliepen.eu.org> |
| 4 | |
6 | |
| 5 | This program is free software; you can redistribute it and/or modify |
7 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
10 | (at your option) any later version. |
| … | |
… | |
| 21 | // and the default cipedrvr uses a different MAC address than we do, |
23 | // and the default cipedrvr uses a different MAC address than we do, |
| 22 | // so this module tries to fix mac addresses in packets and arp packets. |
24 | // so this module tries to fix mac addresses in packets and arp packets. |
| 23 | // this is probably not very fast, but neither is cygwin nor poll. |
25 | // this is probably not very fast, but neither is cygwin nor poll. |
| 24 | // |
26 | // |
| 25 | // http://cipe-win32.sourceforge.net/ |
27 | // http://cipe-win32.sourceforge.net/ |
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28 | // a newer driver is available as part of the openvpn package: |
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29 | // http://openvpn.sf.net/ |
| 26 | |
30 | |
| 27 | #include "config.h" |
31 | #include "config.h" |
| 28 | |
32 | |
| 29 | #include <stdio.h> |
33 | #include <stdio.h> |
| 30 | #include <errno.h> |
34 | #include <errno.h> |
| … | |
… | |
| 36 | #include <cstring> |
40 | #include <cstring> |
| 37 | |
41 | |
| 38 | #include "conf.h" |
42 | #include "conf.h" |
| 39 | #include "util.h" |
43 | #include "util.h" |
| 40 | |
44 | |
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45 | #include <w32api/windows.h> |
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46 | #include <w32api/winioctl.h> |
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47 | |
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48 | #define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}" |
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49 | |
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50 | #define USERMODEDEVICEDIR "\\\\.\\" |
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51 | #define USERDEVICEDIR "\\??\\" |
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52 | #define TAPSUFFIX ".tap" |
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53 | |
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54 | #define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS) |
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55 | |
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56 | #define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED) |
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57 | #define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED) |
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58 | #define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED) |
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59 | |
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60 | static HANDLE device_handle = INVALID_HANDLE_VALUE; |
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61 | static mac my_mac; |
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62 | |
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63 | static const char * |
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64 | wstrerror (int err) |
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65 | { |
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66 | static char buf[1024]; |
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67 | |
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68 | if (!FormatMessage |
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69 | (FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, |
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70 | MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), buf, sizeof (buf), NULL)) |
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71 | { |
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72 | strncpy (buf, _("(unable to format errormessage)"), sizeof (buf)); |
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73 | }; |
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74 | |
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75 | if ((char *newline = strchr (buf, '\r'))) |
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76 | *newline = '\0'; |
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77 | |
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78 | return buf; |
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79 | } |
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80 | |
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81 | const char * |
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82 | tap_device::info () |
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83 | { |
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84 | return _("cygwin cipe/openvpn tap device"); |
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85 | } |
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86 | |
| 41 | tap_device::tap_device () |
87 | tap_device::tap_device () |
| 42 | { |
88 | { |
| 43 | if ((fd = open (conf.ifname, O_RDWR)) < 0) |
89 | HKEY key, key2; |
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90 | int i; |
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91 | |
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92 | char regpath[1024]; |
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93 | char adapterid[1024]; |
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94 | char adaptername[1024]; |
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95 | char tapname[1024]; |
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96 | long len; |
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97 | |
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98 | bool found = false; |
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99 | |
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100 | int sock, err; |
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101 | |
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102 | /* Open registry and look for network adapters */ |
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103 | |
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104 | if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key)) |
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105 | { |
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106 | slog (L_ERR, _("Unable to read registry: %s"), |
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107 | wstrerror (GetLastError ())); |
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108 | return false; |
| 44 | { |
109 | } |
| 45 | slog (L_CRIT, _("could not open %s: %s"), conf.ifname, strerror (errno)); |
110 | |
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111 | for (i = 0;; i++) |
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112 | { |
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113 | len = sizeof (adapterid); |
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114 | if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL)) |
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115 | break; |
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116 | |
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117 | /* Find out more about this adapter */ |
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118 | |
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119 | snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection", |
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120 | REG_CONTROL_NET, adapterid); |
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121 | |
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122 | if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2)) |
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123 | continue; |
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124 | |
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125 | len = sizeof (adaptername); |
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126 | err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len); |
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127 | |
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128 | RegCloseKey (key2); |
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129 | |
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130 | if (err) |
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131 | continue; |
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132 | |
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133 | if (conf.ifname) |
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134 | { |
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135 | if (strcmp (conf.ifname, adapterid)) |
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136 | continue; |
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137 | } |
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138 | else |
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139 | { |
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140 | found = true; |
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141 | break; |
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142 | } |
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143 | |
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144 | snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid); |
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145 | device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, |
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146 | OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0); |
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147 | if (device_handle != INVALID_HANDLE_VALUE) |
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148 | { |
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149 | found = true; |
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150 | break; |
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151 | } |
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152 | } |
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153 | |
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154 | RegCloseKey (key); |
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155 | |
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156 | if (!found) |
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157 | { |
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158 | slog (L_ERR, _("No Windows tap device found!")); |
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159 | exit (1); |
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160 | } |
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161 | |
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162 | strcpy (ifrname, adaptername); |
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163 | |
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164 | /* Try to open the corresponding tap device */ |
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165 | |
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166 | if (device_handle == INVALID_HANDLE_VALUE) |
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167 | { |
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168 | snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device); |
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169 | device_handle = |
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170 | CreateFile (tapname, GENERIC_WRITE | GENERIC_READ, 0, 0, |
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171 | OPEN_EXISTING, |
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172 | FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0); |
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173 | } |
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174 | |
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175 | if (device_handle == INVALID_HANDLE_VALUE) |
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176 | { |
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177 | slog (L_ERR, _("%s is not a usable Windows tap device: %s"), |
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178 | adaptername, wstrerror (GetLastError ())); |
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179 | exit (1); |
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180 | } |
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181 | |
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182 | fd = cygwin_attach_handle_to_fd (tapname, -1, device_handle, 1, GENERIC_WRITE | GENERIC_READ); |
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183 | |
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184 | /* Get MAC address from tap device */ |
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185 | |
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186 | if (!DeviceIoControl |
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187 | (device_handle, TAP_IOCTL_GET_MAC, &mac, sizeof (mac), &mac, sizeof (mac), &len, 0)) |
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188 | { |
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189 | slog (L_ERR, |
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190 | _("Could not get MAC address from Windows tap device %s: %s"), |
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191 | adaptername, wstrerror (GetLastError ())); |
| 46 | exit (1); |
192 | exit (1); |
| 47 | } |
193 | } |
| 48 | } |
194 | } |
| 49 | |
195 | |
| 50 | tap_device::~tap_device () |
196 | tap_device::~tap_device () |
| … | |
… | |
| 60 | pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); |
206 | pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); |
| 61 | |
207 | |
| 62 | if (pkt->len <= 0) |
208 | if (pkt->len <= 0) |
| 63 | { |
209 | { |
| 64 | slog (L_ERR, _("error while reading from %s %s: %s"), |
210 | slog (L_ERR, _("error while reading from %s %s: %s"), |
| 65 | info (), conf.ifname, strerror (errno)); |
211 | info (), conf.ifname, strerror (errno)); |
| 66 | free (pkt); |
212 | free (pkt); |
| 67 | return 0; |
213 | return 0; |
| 68 | } |
214 | } |
| 69 | |
215 | |
| 70 | id2mac (THISNODE->id, &((*pkt)[6])); |
216 | id2mac (THISNODE->id, &((*pkt)[6])); |
| 71 | |
217 | |
| 72 | if (pkt->is_arp ()) |
218 | if (pkt->is_arp ()) |
| 73 | { |
219 | { |
| 74 | if ((*pkt)[22] == 0x08) id2mac (THISNODE->id, &((*pkt)[22])); |
220 | if ((*pkt)[22] == 0x08) |
| 75 | if ((*pkt)[32] == 0x08) id2mac (THISNODE->id, &((*pkt)[32])); |
221 | id2mac (THISNODE->id, &((*pkt)[22])); |
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222 | if ((*pkt)[32] == 0x08) |
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223 | id2mac (THISNODE->id, &((*pkt)[32])); |
| 76 | } |
224 | } |
| 77 | |
225 | |
| 78 | return pkt; |
226 | return pkt; |
| 79 | } |
227 | } |
| 80 | |
228 | |
| 81 | void |
229 | void |
| 82 | tap_device::send (tap_packet *pkt) |
230 | tap_device::send (tap_packet * pkt) |
| 83 | { |
231 | { |
| 84 | (*pkt)[ 6] = 0x08; (*pkt)[ 7] = 0x00; (*pkt)[ 8] = 0x58; |
232 | (*pkt)[6] = 0x08; |
| 85 | (*pkt)[ 9] = 0x00; (*pkt)[10] = 0x00; (*pkt)[11] = 0x01; |
233 | (*pkt)[7] = 0x00; |
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234 | (*pkt)[8] = 0x58; |
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235 | (*pkt)[9] = 0x00; |
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236 | (*pkt)[10] = 0x00; |
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237 | (*pkt)[11] = 0x01; |
| 86 | |
238 | |
| 87 | if (pkt->is_arp ()) |
239 | if (pkt->is_arp ()) |
| 88 | { |
240 | { |
| 89 | if ((*pkt)[22] == 0xfe && (*pkt)[27] == THISNODE->id) |
241 | if ((*pkt)[22] == 0xfe && (*pkt)[27] == THISNODE->id) |
| 90 | memcpy (&(*pkt)[22], &(*pkt)[6], sizeof (mac)); |
242 | memcpy (&(*pkt)[22], &(*pkt)[6], sizeof (mac)); |
| 91 | |
243 | |
| 92 | if ((*pkt)[32] == 0xfe && (*pkt)[37] == THISNODE->id) |
244 | if ((*pkt)[32] == 0xfe && (*pkt)[37] == THISNODE->id) |
| 93 | memcpy (&(*pkt)[32], &(*pkt)[6], sizeof (mac)); |
245 | memcpy (&(*pkt)[32], &(*pkt)[6], sizeof (mac)); |
| 94 | } |
246 | } |
| 95 | |
247 | |
| 96 | if (write (fd, &((*pkt)[0]), pkt->len) < 0) |
248 | if (write (fd, &((*pkt)[0]), pkt->len) < 0) |
| 97 | slog (L_ERR, _("can't write to %s %s: %s"), info (), conf.ifname, |
249 | slog (L_ERR, _("can't write to %s %s: %s"), info (), conf.ifname, |
| 98 | strerror (errno)); |
250 | strerror (errno)); |
| 99 | } |
251 | } |
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252 | |
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253 | #if 0 |
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254 | |
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255 | slog (L_DEBUG, _indent: Standard input:377: Error:Stmt nesting error. |
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256 | ("Tap reader running")); |
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257 | |
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258 | /* Read from tap device and send to parent */ |
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259 | |
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260 | overlapped.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL); |
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261 | |
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262 | for indent |
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263 | : Standard input: 320: Error:Stmt nesting error.(;; |
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264 | ) |
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265 | { |
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266 | overlapped.Offset = 0; |
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267 | overlapped.OffsetHigh = 0; |
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268 | ResetEvent (overlapped.hEvent); |
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269 | |
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270 | status = ReadFile (device_handle, buf, sizeof (buf), &len, &overlapped); |
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271 | |
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272 | if (!status) |
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273 | { |
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274 | if (GetLastError () == ERROR_IO_PENDING) |
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275 | { |
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276 | WaitForSingleObject (overlapped.hEvent, INFINITE); |
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277 | if (!GetOverlappedResult (device_handle, &overlapped, &len, FALSE)) |
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278 | continue; |
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279 | } |
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280 | else |
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281 | { |
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282 | slog (L_ERR, _("Error while reading from %s %s: %s"), |
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283 | device_info, device, strerror (errno)); |
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284 | return -1; |
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285 | } |
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286 | } |
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287 | |
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288 | if (send (sock, buf, len, 0) <= 0) |
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289 | return -1; |
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290 | } |
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291 | } |
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292 | |
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293 | void |
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294 | close_device (void) |
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295 | { |
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296 | cp (); |
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297 | |
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298 | CloseHandle (device_handle); |
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299 | } |
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300 | |
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301 | bool |
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302 | read_packet (vpn_packet_t * packet) |
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303 | { |
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304 | int lenin; |
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305 | |
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306 | cp (); |
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307 | |
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308 | if ((lenin = recv (device_fd, packet->data, MTU, 0)) <= 0) |
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309 | { |
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310 | slog (L_ERR, _("Error while reading from %s %s: %s"), device_info, |
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311 | device, strerror (errno)); |
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312 | return false; |
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313 | } |
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314 | |
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315 | packet->len = lenin; |
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316 | |
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317 | device_total_in += packet->len; |
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318 | |
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319 | ifdebug (TRAFFIC) slog (L_DEBUG, _("Read packet of %d bytes from %s"), |
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320 | packet->len, device_info); |
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321 | |
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322 | return true; |
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323 | } |
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324 | |
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325 | bool |
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326 | write_packet (vpn_packet_t * packet) |
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327 | { |
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328 | long lenout; |
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329 | OVERLAPPED overlapped = { 0 }; |
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330 | |
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331 | cp (); |
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332 | |
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333 | ifdebug (TRAFFIC) slog (L_DEBUG, _("Writing packet of %d bytes to %s"), |
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334 | packet->len, device_info); |
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335 | |
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336 | if (!WriteFile |
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337 | (device_handle, packet->data, packet->len, &lenout, &overlapped)) |
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338 | { |
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339 | slog (L_ERR, _("Error while writing to %s %s: %s"), device_info, |
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340 | device, wstrerror (GetLastError ())); |
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341 | return false; |
|
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342 | } |
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343 | |
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344 | device_total_out += packet->len; |
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345 | |
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346 | return true; |
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347 | } |
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348 | |
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349 | void |
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350 | dump_device_stats (void) |
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351 | { |
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352 | cp (); |
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353 | |
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354 | slog (L_DEBUG, _("Statistics for %s %s:"), device_info, device); |
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355 | slog (L_DEBUG, _(" total bytes in: %10d"), device_total_in); |
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356 | slog (L_DEBUG, _(" total bytes out: %10d"), device_total_out); |
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357 | } |
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358 | #endif |
