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/*
(C) 2007-09 - Luca Deri <deri@ntop.org>
*/
#include "../n2n.h"
#include "n2n_win32.h"
/* 1500 bytes payload + 14 bytes ethernet header + 4 bytes VLAN tag */
#define MTU 1518
void initWin32() {
WSADATA wsaData;
int err;
err = WSAStartup(MAKEWORD(2, 2), &wsaData );
if( err != 0 ) {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
printf("FATAL ERROR: unable to initialise Winsock 2.x.");
exit(-1);
}
}
int open_wintap(struct tuntap_dev *device,
const char * address_mode, /* "static" or "dhcp" */
char *device_ip,
char *device_mask,
const char *device_mac,
int mtu) {
HKEY key, key2;
LONG rc;
char regpath[1024], cmd[256];
char adapterid[1024];
char adaptername[1024];
char tapname[1024];
long len;
int found = 0;
int err, i;
ULONG status = TRUE;
memset(device, 0, sizeof(struct tuntap_dev));
device->device_handle = INVALID_HANDLE_VALUE;
device->device_name = NULL;
device->ifName = NULL;
device->ip_addr = inet_addr(device_ip);
/* Open registry and look for network adapters */
if((rc = RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key))) {
printf("Unable to read registry: [rc=%d]\n", rc);
exit(-1);
/* MSVC Note: If you keep getting rc=2 errors, make sure you set:
Project -> Properties -> Configuration Properties -> General -> Character set
to: "Use Multi-Byte Character Set"
*/
}
for (i = 0; ; i++) {
len = sizeof(adapterid);
if(RegEnumKeyEx(key, i, (LPTSTR)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, (LPCSTR)regpath, 0, KEY_READ, &key2))
continue;
len = sizeof(adaptername);
err = RegQueryValueEx(key2, "Name", 0, 0, adaptername, &len);
RegCloseKey(key2);
if(err)
continue;
if(device->device_name) {
if(!strcmp(device->device_name, adapterid)) {
found = 1;
break;
} else
continue;
}
if(device->ifName) {
if(!strcmp(device->ifName, adaptername)) {
found = 1;
break;
} else
continue;
}
_snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
device->device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ,
0, /* Don't let other processes share or open
the resource until the handle's been closed */
0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
if(device->device_handle != INVALID_HANDLE_VALUE) {
found = 1;
break;
}
}
RegCloseKey(key);
if(!found) {
printf("No Windows tap device found!\n");
exit(0);
}
/* ************************************** */
if(!device->device_name)
device->device_name = _strdup(adapterid);
if(!device->ifName)
device->ifName = _strdup(adaptername);
/* Try to open the corresponding tap device->device_name */
if(device->device_handle == INVALID_HANDLE_VALUE) {
_snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, device->device_name);
device->device_handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ, 0, 0,
OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
}
if(device->device_handle == INVALID_HANDLE_VALUE) {
printf("%s (%s) is not a usable Windows tap device\n", device->device_name, device->ifName);
exit(-1);
}
/* Get MAC address from tap device->device_name */
if(!DeviceIoControl(device->device_handle, TAP_IOCTL_GET_MAC,
device->mac_addr, sizeof(device->mac_addr),
device->mac_addr, sizeof(device->mac_addr), &len, 0)) {
printf("Could not get MAC address from Windows tap %s (%s)\n",
device->device_name, device->ifName);
return -1;
}
device->mtu = mtu;
printf("Open device [name=%s][ip=%s][ifName=%s][MTU=%d][mac=%02X:%02X:%02X:%02X:%02X:%02X]\n",
device->device_name, device_ip, device->ifName, device->mtu,
device->mac_addr[0] & 0xFF,
device->mac_addr[1] & 0xFF,
device->mac_addr[2] & 0xFF,
device->mac_addr[3] & 0xFF,
device->mac_addr[4] & 0xFF,
device->mac_addr[5] & 0xFF);
/* ****************** */
printf("Setting %s device address...\n", device->ifName);
if ( 0 == strcmp("dhcp", address_mode) )
{
_snprintf(cmd, sizeof(cmd),
"netsh interface ip set address \"%s\" dhcp",
device->ifName);
}
else
{
_snprintf(cmd, sizeof(cmd),
"netsh interface ip set address \"%s\" static %s %s",
device->ifName, device_ip, device_mask);
}
if(system(cmd) == 0) {
device->ip_addr = inet_addr(device_ip);
device->device_mask = inet_addr(device_mask);
printf("Device %s set to %s/%s\n",
device->ifName, device_ip, device_mask);
} else
printf("WARNING: Unable to set device %s IP address [%s]\n",
device->ifName, cmd);
/* ****************** */
if(device->mtu != DEFAULT_MTU)
printf("WARNING: MTU set is not supported on Windows\n");
/* set driver media status to 'connected' (i.e. set the interface up) */
if (!DeviceIoControl (device->device_handle, TAP_IOCTL_SET_MEDIA_STATUS,
&status, sizeof (status),
&status, sizeof (status), &len, NULL))
printf("WARNING: Unable to enable TAP adapter\n");
/*
* Initialize overlapped structures
*/
device->overlap_read.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
device->overlap_write.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (!device->overlap_read.hEvent || !device->overlap_write.hEvent) {
return -1;
}
return(0);
}
/* ************************************************ */
int tuntap_read(struct tuntap_dev *tuntap, unsigned char *buf, int len)
{
DWORD read_size, last_err;
ResetEvent(tuntap->overlap_read.hEvent);
if (ReadFile(tuntap->device_handle, buf, len, &read_size, &tuntap->overlap_read)) {
//printf("tun_read(len=%d)\n", read_size);
return read_size;
}
switch (last_err = GetLastError()) {
case ERROR_IO_PENDING:
WaitForSingleObject(tuntap->overlap_read.hEvent, INFINITE);
GetOverlappedResult(tuntap->device_handle, &tuntap->overlap_read, &read_size, FALSE);
return read_size;
break;
default:
printf("GetLastError() returned %d\n", last_err);
break;
}
return -1;
}
/* ************************************************ */
int tuntap_write(struct tuntap_dev *tuntap, unsigned char *buf, int len)
{
DWORD write_size;
//printf("tun_write(len=%d)\n", len);
ResetEvent(tuntap->overlap_write.hEvent);
if (WriteFile(tuntap->device_handle,
buf,
len,
&write_size,
&tuntap->overlap_write)) {
//printf("DONE tun_write(len=%d)\n", write_size);
return write_size;
}
switch (GetLastError()) {
case ERROR_IO_PENDING:
WaitForSingleObject(tuntap->overlap_write.hEvent, INFINITE);
GetOverlappedResult(tuntap->device_handle, &tuntap->overlap_write,
&write_size, FALSE);
return write_size;
break;
default:
break;
}
return -1;
}
/* ************************************************ */
int tuntap_open(struct tuntap_dev *device,
char *dev,
const char *address_mode, /* static or dhcp */
char *device_ip,
char *device_mask,
const char * device_mac,
int mtu) {
return(open_wintap(device, address_mode, device_ip, device_mask, device_mac, mtu));
}
/* ************************************************ */
void tuntap_close(struct tuntap_dev *tuntap) {
CloseHandle(tuntap->device_handle);
}
/* Fill out the ip_addr value from the interface. Called to pick up dynamic
* address changes. */
void tuntap_get_address(struct tuntap_dev *tuntap)
{
}
/* ************************************************ */
#if 0
int main(int argc, char* argv[]) {
struct tuntap_dev tuntap;
int i;
int mtu = 1400;
printf("Welcome to n2n\n");
initWin32();
open_wintap(&tuntap, "static", "1.2.3.20", "255.255.255.0", mtu);
for(i=0; i<10; i++) {
u_char buf[MTU];
int rc;
rc = tun_read(&tuntap, buf, sizeof(buf));
buf[0]=2;
buf[1]=3;
buf[2]=4;
printf("tun_read returned %d\n", rc);
rc = tun_write(&tuntap, buf, rc);
printf("tun_write returned %d\n", rc);
}
// rc = tun_open (device->device_name, IF_MODE_TUN);
WSACleanup ();
return(0);
}
#endif