289 lines
7.0 KiB
C
289 lines
7.0 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* FreeRDP Proxy Server Session Capture Module
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*
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* Copyright 2019 Kobi Mizrachi <kmizrachi18@gmail.com>
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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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#define TAG MODULE_TAG("capture")
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#define PLUGIN_NAME "capture"
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#define PLUGIN_DESC "stream egfx connections over tcp"
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#include <errno.h>
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#include <winpr/image.h>
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#include <freerdp/gdi/gdi.h>
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#include <winpr/winsock.h>
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#include "pf_log.h"
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#include "modules_api.h"
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#include "pf_context.h"
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#include "cap_config.h"
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#include "cap_protocol.h"
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#define BUFSIZE 8092
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static proxyPluginsManager* g_plugins_manager = NULL;
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static captureConfig config = { 0 };
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static SOCKET capture_plugin_init_socket(void)
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{
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int status;
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int sockfd;
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struct sockaddr_in addr = { 0 };
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sockfd = _socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (sockfd == -1)
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return -1;
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addr.sin_family = AF_INET;
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addr.sin_port = htons(config.port);
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inet_pton(AF_INET, config.host, &(addr.sin_addr));
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status = _connect(sockfd, (const struct sockaddr*)&addr, sizeof(addr));
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if (status < 0)
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{
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close(sockfd);
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return -1;
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}
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return sockfd;
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}
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static BOOL capture_plugin_send_data(SOCKET sockfd, const BYTE* buffer, size_t len)
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{
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size_t chunk_len;
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int nsent;
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if (!buffer)
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return FALSE;
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while (len > 0)
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{
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chunk_len = len > BUFSIZE ? BUFSIZE : len;
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nsent = _send(sockfd, (const char*)buffer, chunk_len, 0);
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if (nsent == -1)
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return FALSE;
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buffer += nsent;
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len -= nsent;
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}
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return TRUE;
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}
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static BOOL capture_plugin_send_packet(SOCKET sockfd, wStream* packet)
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{
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size_t len;
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BYTE* buffer;
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BOOL result = FALSE;
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if (!packet)
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return FALSE;
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buffer = Stream_Buffer(packet);
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len = Stream_Capacity(packet);
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if (!capture_plugin_send_data(sockfd, buffer, len))
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{
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WLog_ERR(TAG, "error while transmitting frame: errno=%d", errno);
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goto error;
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}
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result = TRUE;
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error:
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Stream_Free(packet, TRUE);
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return result;
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}
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static SOCKET capture_plugin_get_socket(proxyData* pdata)
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{
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void* custom;
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custom = g_plugins_manager->GetPluginData(PLUGIN_NAME, pdata);
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if (!custom)
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return -1;
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return (SOCKET)custom;
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}
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static BOOL capture_plugin_session_end(proxyData* pdata)
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{
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SOCKET socket;
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BOOL ret;
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wStream* s;
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socket = capture_plugin_get_socket(pdata);
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if (socket == INVALID_SOCKET)
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return FALSE;
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s = capture_plugin_packet_new(SESSION_END_PDU_BASE_SIZE, MESSAGE_TYPE_SESSION_END);
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if (!s)
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return FALSE;
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ret = capture_plugin_send_packet(socket, s);
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closesocket(socket);
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return ret;
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}
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static BOOL capture_plugin_send_frame(pClientContext* pc, SOCKET socket, const BYTE* buffer)
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{
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size_t frame_size;
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BOOL ret = FALSE;
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wStream* s = NULL;
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BYTE* bmp_header = NULL;
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rdpSettings* settings = pc->context.settings;
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frame_size = settings->DesktopWidth * settings->DesktopHeight * (settings->ColorDepth / 8);
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bmp_header = winpr_bitmap_construct_header(settings->DesktopWidth, settings->DesktopHeight,
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settings->ColorDepth);
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if (!bmp_header)
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return FALSE;
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/*
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* capture frame packet indicates a packet that contains a frame buffer. payload length is
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* marked as 0, and receiving side must read `frame_size` bytes, a constant size of
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* width*height*(bpp/8) from the socket, to receive the full frame buffer.
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*/
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s = capture_plugin_packet_new(0, MESSAGE_TYPE_CAPTURED_FRAME);
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if (!s)
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goto error;
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if (!capture_plugin_send_packet(socket, s))
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goto error;
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ret = capture_plugin_send_data(socket, bmp_header, WINPR_IMAGE_BMP_HEADER_LEN);
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if (!ret)
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goto error;
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ret = capture_plugin_send_data(socket, buffer, frame_size);
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error:
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free(bmp_header);
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return ret;
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}
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static BOOL capture_plugin_client_end_paint(proxyData* pdata)
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{
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pClientContext* pc = pdata->pc;
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rdpGdi* gdi = pc->context.gdi;
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SOCKET socket;
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if (gdi->suppressOutput)
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return TRUE;
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if (gdi->primary->hdc->hwnd->ninvalid < 1)
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return TRUE;
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socket = capture_plugin_get_socket(pdata);
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if (socket == INVALID_SOCKET)
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return FALSE;
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if (!capture_plugin_send_frame(pc, socket, gdi->primary_buffer))
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{
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WLog_ERR(TAG, "capture_plugin_send_frame failed!");
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return FALSE;
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}
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gdi->primary->hdc->hwnd->invalid->null = TRUE;
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gdi->primary->hdc->hwnd->ninvalid = 0;
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return TRUE;
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}
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static BOOL capture_plugin_client_post_connect(proxyData* pdata)
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{
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SOCKET socket;
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wStream* s;
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pClientContext* pc = pdata->pc;
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rdpSettings* settings = pc->context.settings;
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socket = capture_plugin_init_socket();
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if (socket == INVALID_SOCKET)
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{
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WLog_ERR(TAG, "failed to establish a connection");
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return FALSE;
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}
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g_plugins_manager->SetPluginData(PLUGIN_NAME, pdata, (void*)socket);
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s = capture_plugin_create_session_info_packet(settings);
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if (!s)
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return FALSE;
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return capture_plugin_send_packet(socket, s);
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}
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static BOOL capture_plugin_server_post_connect(proxyData* pdata)
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{
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pServerContext* ps = pdata->ps;
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proxyConfig* config = pdata->config;
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rdpSettings* settings = ps->context.settings;
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if (!config->GFX || !config->SessionCapture)
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{
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WLog_ERR(TAG, "config options 'GFX' and 'SessionCapture' options must be set to true!");
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return FALSE;
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}
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if (!settings->SupportGraphicsPipeline)
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{
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WLog_ERR(TAG, "session capture is only supported for GFX clients, denying connection");
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return FALSE;
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}
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return TRUE;
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}
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static BOOL capture_plugin_unload(void)
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{
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capture_plugin_config_free_internal(&config);
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return TRUE;
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}
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static proxyPlugin demo_plugin = {
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PLUGIN_NAME, /* name */
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PLUGIN_DESC, /* description */
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capture_plugin_unload, /* PluginUnload */
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NULL, /* ClientPreConnect */
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capture_plugin_client_post_connect, /* ClientPostConnect */
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NULL, /* ClientLoginFailure */
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capture_plugin_client_end_paint, /* ClientEndPaint */
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capture_plugin_server_post_connect, /* ServerPostConnect */
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NULL, /* ServerChannelsInit */
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NULL, /* ServerChannelsFree */
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capture_plugin_session_end, /* Session End */
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NULL, /* KeyboardEvent */
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NULL, /* MouseEvent */
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NULL, /* ClientChannelData */
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NULL, /* ServerChannelData */
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};
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BOOL proxy_module_entry_point(proxyPluginsManager* plugins_manager)
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{
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g_plugins_manager = plugins_manager;
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if (!capture_plugin_init_config(&config))
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{
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WLog_ERR(TAG, "failed to load config");
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return FALSE;
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}
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WLog_INFO(TAG, "host: %s, port: %" PRIu16 "", config.host, config.port);
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return plugins_manager->RegisterPlugin(&demo_plugin);
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}
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