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Comparing gvpe/src/device-cygwin.C (file contents):
Revision 1.2 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.8 by pcg, Thu Jan 29 18:55:10 2004 UTC

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) 2003-2004 Marc Lehmann <ocg@goof.com>
4 Copyright (C) 2002-2003 Ivo Timmermans <ivo@o2w.nl>,
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/
28// a newer driver is available as part of the openvpn package:
29// http://openvpn.sf.net/
26 30
27#include "config.h" 31#include "config.h"
28 32
29#include <stdio.h> 33#include <cstdio>
34#include <cstring>
35#include <cstdlib>
30#include <errno.h> 36#include <errno.h>
31#include <sys/types.h> 37#include <sys/types.h>
32#include <sys/stat.h> 38#include <sys/stat.h>
33#include <fcntl.h> 39#include <fcntl.h>
34#include <unistd.h> 40#include <unistd.h>
35#include <syslog.h>
36#include <cstring>
37 41
38#include "conf.h" 42#include "conf.h"
39#include "util.h" 43#include "util.h"
40 44
45#include <io.h>
46#include <w32api/windows.h>
47#include <w32api/winioctl.h>
48
49#define REG_CONTROL_NET "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
50
51#define USERMODEDEVICEDIR "\\\\.\\"
52#define USERDEVICEDIR "\\??\\"
53#define TAPSUFFIX ".tap"
54
55#define TAP_CONTROL_CODE(request,method) CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD | 8000, request, method, FILE_ANY_ACCESS)
56
57#define TAP_IOCTL_GET_LASTMAC TAP_CONTROL_CODE(0, METHOD_BUFFERED)
58#define TAP_IOCTL_GET_MAC TAP_CONTROL_CODE(1, METHOD_BUFFERED)
59#define TAP_IOCTL_SET_STATISTICS TAP_CONTROL_CODE(2, METHOD_BUFFERED)
60#define TAP_IOCTL_SET_MEDIA_STATUS TAP_CONTROL_CODE(7, METHOD_BUFFERED)
61
62static const char *
63wstrerror (int err)
64{
65 static char buf[1024];
66
67 if (!FormatMessage
68 (FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err,
69 MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), buf, sizeof (buf), NULL))
70 {
71 strncpy (buf, _("(unable to format errormessage)"), sizeof (buf));
72 };
73
74 char *nl;
75 if ((nl = strchr (buf, '\r')))
76 *nl = '\0';
77
78 return buf;
79}
80
81static HANDLE device_handle = INVALID_HANDLE_VALUE;
82static mac local_mac;
83static tap_packet *rcv_pkt;
84static int iopipe[2];
85static HANDLE pipe_handle, send_event, thread;
86
87static DWORD WINAPI
88read_thread(void *)
89{
90 static OVERLAPPED overlapped;
91 static DWORD dlen;
92 static u32 len;
93 static u8 data[MAX_MTU];
94
95 overlapped.hEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
96
97 for (;;)
98 {
99 if (!ReadFile (device_handle, data, MAX_MTU, &dlen, &overlapped))
100 {
101 if (GetLastError () == ERROR_IO_PENDING)
102 GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
103 else
104 {
105 slog (L_ERR, "WIN32 TAP: ReadFile returned error: %s", wstrerror (GetLastError ()));
106 exit (EXIT_FAILURE);
107 }
108 }
109
110 if (dlen > 0)
111 {
112 len = dlen;
113 WriteFile (pipe_handle, &len, sizeof (len), &dlen, NULL);
114 WriteFile (pipe_handle, data, len, &dlen, NULL);
115 }
116 }
117}
118
41const char * 119const char *
42tap_device::info () 120tap_device::info ()
43{ 121{
44 return _("broken cygwin cipe device"); 122 return _("cygwin cipe/openvpn tap device");
45} 123}
46 124
47tap_device::tap_device () 125tap_device::tap_device ()
48{ 126{
49 if ((fd = open (conf.ifname, O_RDWR)) < 0) 127 HKEY key, key2;
50 { 128 int i;
51 slog (L_CRIT, _("could not open %s: %s"), conf.ifname, strerror (errno)); 129
52 exit (1); 130 char regpath[1024];
131 char adapterid[1024];
132 BYTE adaptername[1024];
133 char tapname[1024];
134 DWORD len;
135
136 bool found = false;
137
138 int sock, err;
139
140 /* Open registry and look for network adapters */
141
142 if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_CONTROL_NET, 0, KEY_READ, &key))
53 } 143 {
144 slog (L_ERR, _("WIN32 TAP: unable to read registry: %s"),
145 wstrerror (GetLastError ()));
146 exit (EXIT_FAILURE);
147 }
148
149 for (i = 0;; i++)
150 {
151 len = sizeof (adapterid);
152 if (RegEnumKeyEx (key, i, adapterid, &len, 0, 0, 0, NULL))
153 break;
154
155 /* Find out more about this adapter */
156
157 snprintf (regpath, sizeof (regpath), "%s\\%s\\Connection",
158 REG_CONTROL_NET, adapterid);
159
160 if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, regpath, 0, KEY_READ, &key2))
161 continue;
162
163 len = sizeof (adaptername);
164 err = RegQueryValueEx (key2, "Name", 0, 0, adaptername, &len);
165
166 RegCloseKey (key2);
167
168 if (err)
169 continue;
170
171 if (conf.ifname)
172 {
173 if (strcmp (conf.ifname, adapterid))
174 continue;
175 }
176 else
177 {
178 found = true;
179 break;
180 }
181
182 snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
183 device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0,
184 OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
185 if (device_handle != INVALID_HANDLE_VALUE)
186 {
187 found = true;
188 break;
189 }
190 }
191
192 RegCloseKey (key);
193
194 if (!found)
195 {
196 slog (L_ERR, _("WIN32 TAP: no windows tap device found!"));
197 exit (EXIT_FAILURE);
198 }
199
200 /* Try to open the corresponding tap device */
201
202 if (device_handle == INVALID_HANDLE_VALUE)
203 {
204 snprintf (tapname, sizeof (tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
205 device_handle =
206 CreateFile (tapname, GENERIC_WRITE | GENERIC_READ, 0, 0,
207 OPEN_EXISTING,
208 FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
209 }
210
211 if (device_handle == INVALID_HANDLE_VALUE)
212 {
213 slog (L_ERR, _("WIN32 TAP: %s is not a usable windows tap device %s: %s"),
214 adaptername, tapname, wstrerror (GetLastError ()));
215 exit (EXIT_FAILURE);
216 }
217
218 strcpy (ifrname, (char *)tapname);
219
220 /* Get MAC address from tap device */
221
222 if (!DeviceIoControl (device_handle, TAP_IOCTL_GET_MAC,
223 &local_mac, sizeof (local_mac), &local_mac, sizeof (local_mac),
224 &len, 0))
225 {
226 slog (L_ERR,
227 _("WIN32 TAP: could not get MAC address from windows tap device %s: %s"),
228 adaptername, wstrerror (GetLastError ()));
229 exit (EXIT_FAILURE);
230 }
231
232 pipe (iopipe);
233 fd = iopipe[0];
234 pipe_handle = (HANDLE) get_osfhandle (iopipe[1]);
235
236 send_event = CreateEvent (NULL, FALSE, FALSE, NULL);
237
238 thread = CreateThread (NULL, 0, read_thread, NULL, 0, NULL);
239
240 /* try to set driver media status to 'connected' */
241 ULONG status = TRUE;
242 DeviceIoControl (device_handle, TAP_IOCTL_SET_MEDIA_STATUS,
243 &status, sizeof (status),
244 &status, sizeof (status), &len, NULL);
245 // ignore error here on purpose
54} 246}
55 247
56tap_device::~tap_device () 248tap_device::~tap_device ()
57{ 249{
58 close (fd); 250 close (iopipe[0]);
251 close (iopipe[1]);
252 CloseHandle (device_handle);
253 CloseHandle (send_event);
59} 254}
60 255
61tap_packet * 256tap_packet *
62tap_device::recv () 257tap_device::recv ()
63{ 258{
64 tap_packet *pkt = new tap_packet; 259 tap_packet *pkt = new tap_packet;
65 260
66 pkt->len = read (fd, &((*pkt)[0]), MAX_MTU); 261 if (sizeof (u32) != read (iopipe[0], &pkt->len, sizeof (u32)))
67
68 if (pkt->len <= 0)
69 { 262 {
70 slog (L_ERR, _("error while reading from %s %s: %s"), 263 slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt length"));
71 info (), conf.ifname, strerror (errno)); 264 delete pkt;
72 free (pkt);
73 return 0; 265 return 0;
74 } 266 }
75 267
268 if (pkt->len != read (iopipe[0], &((*pkt)[0]), pkt->len))
269 {
270 slog (L_ERR, _("WIN32 TAP: i/o thread delivered incomplete pkt"));
271 delete pkt;
272 return 0;
273 }
274
76 id2mac (THISNODE->id, &((*pkt)[6])); 275 id2mac (THISNODE->id, &((*pkt)[6]));
77 276
78 if (pkt->is_arp ()) 277 if (pkt->is_arp ())
79 { 278 {
80 if ((*pkt)[22] == 0x08) id2mac (THISNODE->id, &((*pkt)[22])); 279 if (!memcmp (&(*pkt)[22], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((*pkt)[22]));
81 if ((*pkt)[32] == 0x08) id2mac (THISNODE->id, &((*pkt)[32])); 280 if (!memcmp (&(*pkt)[32], &local_mac, sizeof (mac))) id2mac (THISNODE->id, &((*pkt)[32]));
82 } 281 }
83 282
84 return pkt; 283 return pkt;
85} 284}
86 285
87void 286void
88tap_device::send (tap_packet *pkt) 287tap_device::send (tap_packet * pkt)
89{ 288{
90 (*pkt)[ 6] = 0x08; (*pkt)[ 7] = 0x00; (*pkt)[ 8] = 0x58; 289 memcpy (&(*pkt)[6], &local_mac, sizeof (mac));
91 (*pkt)[ 9] = 0x00; (*pkt)[10] = 0x00; (*pkt)[11] = 0x01;
92 290
93 if (pkt->is_arp ()) 291 if (pkt->is_arp ())
94 { 292 {
95 if ((*pkt)[22] == 0xfe && (*pkt)[27] == THISNODE->id) 293 if ((*pkt)[22] == 0xfe && (*pkt)[27] == THISNODE->id)
96 memcpy (&(*pkt)[22], &(*pkt)[6], sizeof (mac)); 294 memcpy (&(*pkt)[22], &local_mac, sizeof (mac));
97 295
98 if ((*pkt)[32] == 0xfe && (*pkt)[37] == THISNODE->id) 296 if ((*pkt)[32] == 0xfe && (*pkt)[37] == THISNODE->id)
99 memcpy (&(*pkt)[32], &(*pkt)[6], sizeof (mac)); 297 memcpy (&(*pkt)[32], &local_mac, sizeof (mac));
298 }
299
300 DWORD dlen;
301 OVERLAPPED overlapped;
302 overlapped.hEvent = send_event;
303
304 if (!WriteFile (device_handle, &((*pkt)[0]), pkt->len, &dlen, &overlapped))
100 } 305 {
101 306 if (GetLastError () == ERROR_IO_PENDING)
102 if (write (fd, &((*pkt)[0]), pkt->len) < 0) 307 GetOverlappedResult (device_handle, &overlapped, &dlen, TRUE);
308 else
103 slog (L_ERR, _("can't write to %s %s: %s"), info (), conf.ifname, 309 slog (L_ERR, _("WIN32 TAP: can't write to %s %s: %s"), info (), conf.ifname,
104 strerror (errno)); 310 wstrerror (GetLastError ()));
311 }
105} 312}

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