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