246 lines
7.2 KiB
C
246 lines
7.2 KiB
C
/**
|
|
* FreeRDP: A Remote Desktop Protocol Implementation
|
|
* rdp2tcp Virtual Channel Extension
|
|
*
|
|
* Copyright 2017 Artur Zaprzala
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <assert.h>
|
|
|
|
#include <winpr/file.h>
|
|
#include <winpr/pipe.h>
|
|
#include <winpr/thread.h>
|
|
|
|
#include <freerdp/svc.h>
|
|
|
|
#define RDP2TCP_CHAN_NAME "rdp2tcp"
|
|
|
|
static int const debug = 0;
|
|
|
|
typedef struct {
|
|
HANDLE hStdOutputRead;
|
|
HANDLE hStdInputWrite;
|
|
HANDLE hProcess;
|
|
HANDLE copyThread;
|
|
HANDLE writeComplete;
|
|
DWORD openHandle;
|
|
void *initHandle;
|
|
CHANNEL_ENTRY_POINTS_FREERDP_EX channelEntryPoints;
|
|
char buffer[16*1024];
|
|
} Plugin;
|
|
|
|
|
|
static int init_external_addin(Plugin *plugin) {
|
|
SECURITY_ATTRIBUTES saAttr = {
|
|
.nLength = sizeof(SECURITY_ATTRIBUTES),
|
|
.bInheritHandle = TRUE,
|
|
.lpSecurityDescriptor = NULL
|
|
};
|
|
STARTUPINFO siStartInfo = {
|
|
.cb = sizeof(STARTUPINFO),
|
|
.hStdError = GetStdHandle(STD_ERROR_HANDLE),
|
|
.dwFlags = STARTF_USESTDHANDLES
|
|
};
|
|
PROCESS_INFORMATION procInfo = {};
|
|
|
|
// Create pipes
|
|
if (!CreatePipe(&plugin->hStdOutputRead, &siStartInfo.hStdOutput, &saAttr, 0)) {
|
|
perror("stdout CreatePipe");
|
|
return -1;
|
|
}
|
|
if (!SetHandleInformation(plugin->hStdOutputRead, HANDLE_FLAG_INHERIT, 0)) {
|
|
perror("stdout SetHandleInformation");
|
|
return -1;
|
|
}
|
|
if (!CreatePipe(&siStartInfo.hStdInput, &plugin->hStdInputWrite, &saAttr, 0)) {
|
|
perror("stdin CreatePipe");
|
|
return -1;
|
|
}
|
|
if (!SetHandleInformation(plugin->hStdInputWrite, HANDLE_FLAG_INHERIT, 0)) {
|
|
perror("stdin SetHandleInformation");
|
|
return -1;
|
|
}
|
|
|
|
// Execute plugin
|
|
if (!CreateProcess(NULL,
|
|
plugin->channelEntryPoints.pExtendedData, // command line
|
|
NULL, // process security attributes
|
|
NULL, // primary thread security attributes
|
|
TRUE, // handles are inherited
|
|
0, // creation flags
|
|
NULL, // use parent's environment
|
|
NULL, // use parent's current directory
|
|
&siStartInfo, // STARTUPINFO pointer
|
|
&procInfo // receives PROCESS_INFORMATION
|
|
)) {
|
|
perror("fork for addin");
|
|
return -1;
|
|
}
|
|
|
|
plugin->hProcess = procInfo.hProcess;
|
|
CloseHandle(procInfo.hThread);
|
|
CloseHandle(siStartInfo.hStdOutput);
|
|
CloseHandle(siStartInfo.hStdInput);
|
|
return 0;
|
|
}
|
|
|
|
static void dumpData(char *data, unsigned length) {
|
|
unsigned const limit = 98;
|
|
unsigned l = length>limit ? limit/2 : length;
|
|
for (unsigned i=0; i<l; ++i) {
|
|
printf("%02hhx", data[i]);
|
|
}
|
|
if (length>limit) {
|
|
printf("...");
|
|
for (unsigned i=length-l; i<length; ++i)
|
|
printf("%02hhx", data[i]);
|
|
}
|
|
puts("");
|
|
}
|
|
|
|
static DWORD copyThread(void *data) {
|
|
Plugin *plugin = (Plugin *)data;
|
|
size_t const bufsize = 16*1024;
|
|
while (1) {
|
|
DWORD dwRead;
|
|
char *buffer = malloc(bufsize);
|
|
if (!buffer) {
|
|
fprintf(stderr, "rdp2tcp copyThread: malloc failed\n");
|
|
return -1;
|
|
}
|
|
//if (!ReadFile(plugin->hStdOutputRead, plugin->buffer, sizeof plugin->buffer, &dwRead, NULL))
|
|
if (!ReadFile(plugin->hStdOutputRead, buffer, bufsize, &dwRead, NULL))
|
|
return -1;
|
|
if (debug>1) {
|
|
printf(">%8u ", (unsigned)dwRead);
|
|
dumpData(buffer, dwRead);
|
|
}
|
|
if (plugin->channelEntryPoints.pVirtualChannelWriteEx(plugin->initHandle, plugin->openHandle, buffer, dwRead, NULL) != CHANNEL_RC_OK) {
|
|
fprintf(stderr, "rdp2tcp copyThread failed %i\n", (int)dwRead);
|
|
return -1;
|
|
}
|
|
WaitForSingleObject(plugin->writeComplete, INFINITE);
|
|
ResetEvent(plugin->writeComplete);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void closeChannel(Plugin *plugin) {
|
|
if (debug)
|
|
puts("rdp2tcp closing channel");
|
|
plugin->channelEntryPoints.pVirtualChannelCloseEx(plugin->initHandle, plugin->openHandle);
|
|
}
|
|
|
|
static void dataReceived(Plugin *plugin, void *pData, UINT32 dataLength, UINT32 totalLength, UINT32 dataFlags) {
|
|
DWORD dwWritten;
|
|
|
|
if (dataFlags & CHANNEL_FLAG_SUSPEND) {
|
|
if (debug)
|
|
puts("rdp2tcp Channel Suspend");
|
|
return;
|
|
}
|
|
if (dataFlags & CHANNEL_FLAG_RESUME) {
|
|
if (debug)
|
|
puts("rdp2tcp Channel Resume");
|
|
return;
|
|
}
|
|
if (debug>1) {
|
|
printf("<%c%3u/%3u ", dataFlags & CHANNEL_FLAG_FIRST ? ' ': '+', totalLength, dataLength);
|
|
dumpData(pData, dataLength);
|
|
}
|
|
if (dataFlags & CHANNEL_FLAG_FIRST) {
|
|
if (!WriteFile(plugin->hStdInputWrite, &totalLength, sizeof(totalLength), &dwWritten, NULL))
|
|
closeChannel(plugin);
|
|
}
|
|
if (!WriteFile(plugin->hStdInputWrite, pData, dataLength, &dwWritten, NULL))
|
|
closeChannel(plugin);
|
|
}
|
|
|
|
static void VCAPITYPE VirtualChannelOpenEventEx(LPVOID lpUserParam, DWORD openHandle, UINT event, LPVOID pData, UINT32 dataLength, UINT32 totalLength, UINT32 dataFlags) {
|
|
Plugin *plugin = (Plugin*)lpUserParam;
|
|
switch (event) {
|
|
case CHANNEL_EVENT_DATA_RECEIVED:;
|
|
dataReceived(plugin, pData, dataLength, totalLength, dataFlags);
|
|
break;
|
|
case CHANNEL_EVENT_WRITE_COMPLETE:
|
|
SetEvent(plugin->writeComplete);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static VOID VCAPITYPE VirtualChannelInitEventEx(LPVOID lpUserParam, LPVOID pInitHandle, UINT event, LPVOID pData, UINT dataLength) {
|
|
Plugin *plugin = (Plugin*)lpUserParam;
|
|
switch (event) {
|
|
case CHANNEL_EVENT_CONNECTED:
|
|
if (debug)
|
|
puts("rdp2tcp connected");
|
|
plugin->writeComplete = CreateEvent(NULL, TRUE, FALSE, NULL);
|
|
plugin->copyThread = CreateThread(NULL, 0, copyThread, plugin, 0, NULL);
|
|
if (plugin->channelEntryPoints.pVirtualChannelOpenEx(pInitHandle, &plugin->openHandle, RDP2TCP_CHAN_NAME, VirtualChannelOpenEventEx) != CHANNEL_RC_OK)
|
|
return;
|
|
break;
|
|
case CHANNEL_EVENT_DISCONNECTED:
|
|
if (debug)
|
|
puts("rdp2tcp disconnected");
|
|
break;
|
|
case CHANNEL_EVENT_TERMINATED:
|
|
if (debug)
|
|
puts("rdp2tcp terminated");
|
|
if (plugin->copyThread) {
|
|
TerminateThread(plugin->copyThread, 0);
|
|
CloseHandle(plugin->writeComplete);
|
|
}
|
|
CloseHandle(plugin->hStdInputWrite);
|
|
CloseHandle(plugin->hStdOutputRead);
|
|
TerminateProcess(plugin->hProcess, 0);
|
|
CloseHandle(plugin->hProcess);
|
|
free(plugin);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#if 1
|
|
#define VirtualChannelEntryEx rdp2tcp_VirtualChannelEntryEx
|
|
#else
|
|
#define VirtualChannelEntryEx FREERDP_API VirtualChannelEntryEx
|
|
#endif
|
|
BOOL VCAPITYPE VirtualChannelEntryEx(PCHANNEL_ENTRY_POINTS pEntryPoints, PVOID pInitHandle) {
|
|
Plugin *plugin = (Plugin *)calloc(1, sizeof(Plugin));
|
|
if (!plugin)
|
|
return FALSE;
|
|
|
|
CHANNEL_ENTRY_POINTS_FREERDP_EX *pEntryPointsEx = (CHANNEL_ENTRY_POINTS_FREERDP_EX *)pEntryPoints;
|
|
assert(pEntryPointsEx->cbSize >= sizeof(CHANNEL_ENTRY_POINTS_FREERDP_EX) && pEntryPointsEx->MagicNumber == FREERDP_CHANNEL_MAGIC_NUMBER);
|
|
plugin->initHandle = pInitHandle;
|
|
plugin->channelEntryPoints = *pEntryPointsEx;
|
|
|
|
if (init_external_addin(plugin) < 0)
|
|
return FALSE;
|
|
|
|
CHANNEL_DEF channelDef = {
|
|
.name = RDP2TCP_CHAN_NAME,
|
|
.options =
|
|
CHANNEL_OPTION_INITIALIZED |
|
|
CHANNEL_OPTION_ENCRYPT_RDP |
|
|
CHANNEL_OPTION_COMPRESS_RDP
|
|
};
|
|
if (pEntryPointsEx->pVirtualChannelInitEx(plugin, NULL, pInitHandle, &channelDef, 1, VIRTUAL_CHANNEL_VERSION_WIN2000, VirtualChannelInitEventEx) != CHANNEL_RC_OK)
|
|
return FALSE;
|
|
return TRUE;
|
|
}
|
|
|
|
// vim:ts=4
|