517 lines
12 KiB
C
517 lines
12 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Laxmikant Rashinkar 2012 LK.Rashinkar@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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#include "drdynvc.h"
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int g_drdynvc_chan_id;
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int g_drdynvc_inited = 0;
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/**
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* bring up dynamic virtual channel
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*
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* @return 0 on success, -1 on response
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******************************************************************************/
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int APP_CC
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drdynvc_init(void)
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{
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/* bring up X11 */
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xcommon_init();
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/* let client know what version of DVC we support */
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drdynvc_send_capability_request(2);
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return 0;
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}
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/**
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* let DVC Manager on client end know what version of protocol we support
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* client will respond with version that it supports
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*
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* @return 0 on success, -1 on response
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******************************************************************************/
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static int APP_CC
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drdynvc_send_capability_request(uint16_t version)
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{
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struct stream *s;
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int bytes_in_stream;
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/* setup stream */
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make_stream(s);
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init_stream(s, MAX_PDU_SIZE);
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out_uint8(s, 0x50); /* insert cmd */
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out_uint8(s, 0x00); /* insert padding */
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out_uint16_le(s, version); /* insert version */
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/* channel priority unused for now */
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out_uint16_le(s, 0x0000); /* priority charge 0 */
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out_uint16_le(s, 0x0000); /* priority charge 1 */
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out_uint16_le(s, 0x0000); /* priority charge 2 */
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out_uint16_le(s, 0x0000); /* priority charge 3 */
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/* send command to client */
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bytes_in_stream = stream_length_before_p(s);
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send_channel_data(g_drdynvc_chan_id, s->data, bytes_in_stream);
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free_stream(s);
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return 0;
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}
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/**
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* process capability response received from DVC manager at client end
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*
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* @param s stream containing client response
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*
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* @return 0 on success, -1 on failure
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******************************************************************************/
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static int APP_CC
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drdynvc_process_capability_response(struct stream *s, unsigned char cmd)
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{
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int cap_version;
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/* skip padding */
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in_uint8s(s, 1);
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/* read client's version */
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in_uint16_le(s, cap_version);
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if (cap_version != 2)
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{
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LOG(0, ("drdynvc_process_capability_response: incompatible DVC version %d detected", cap_version));
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return -1;
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}
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LOG(0, ("drdynvc_process_capability_response: DVC version 2 selected"));
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g_drdynvc_inited = 1;
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return 0;
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}
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/**
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* create a new dynamic virtual channel
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*
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* @pram channel_id channel id number
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* @pram channel_name name of channel
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*
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* @return 0 on success, -1 on failure
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******************************************************************************/
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int APP_CC
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drdynvc_send_open_channel_request(int chan_pri, unsigned int chan_id,
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char *chan_name)
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{
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struct stream *s;
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int bytes_in_stream;
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int cbChId;
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int name_length;
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if ((chan_name == NULL) || (strlen(chan_name) == 0))
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{
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LOG(0, ("drdynvc_send_open_channel_request: bad channel name specified"));
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return -1;
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}
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make_stream(s);
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init_stream(s, MAX_PDU_SIZE);
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name_length = strlen(chan_name);
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/* dummy command for now */
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out_uint8(s, 0);
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/* insert channel id */
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cbChId = drdynvc_insert_uint_124(s, chan_id);
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/* insert channel name */
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out_uint8a(s, chan_name, name_length + 1);
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/* insert command */
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s->data[0] = CMD_DVC_OPEN_CHANNEL | ((chan_pri << 2) & 0x0c) | cbChId;
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/* send command */
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bytes_in_stream = stream_length_before_p(s);
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send_channel_data(g_drdynvc_chan_id, s->data, bytes_in_stream);
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free_stream(s);
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return 0;
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}
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static int APP_CC
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drdynvc_process_open_channel_response(struct stream *s, unsigned char cmd)
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{
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struct xrdp_api_data *adp;
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uint32_t chan_id;
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int creation_status;
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drdynvc_get_chan_id(s, cmd, &chan_id);
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in_uint32_le(s, creation_status);
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/* LK_TODO now do something using useful! */
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if (creation_status < 0)
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{
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// TODO
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}
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else
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{
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/* get struct xrdp_api_data containing this channel id */
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if ((adp = struct_from_dvc_chan_id(chan_id)) == NULL)
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{
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LOG(0, ("drdynvc_process_open_channel_response: error : "
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"could not find xrdp_api_data containing chan_id %d", chan_id));
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return -1;
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}
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adp->is_connected = 1;
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}
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return 0;
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}
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int APP_CC
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drdynvc_send_close_channel_request(unsigned int chan_id)
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{
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struct stream *s;
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int bytes_in_stream;
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int cbChId;
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make_stream(s);
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init_stream(s, MAX_PDU_SIZE);
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/* insert dummy cmd for now */
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out_uint8(s, 0);
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/* insert channel id */
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cbChId = drdynvc_insert_uint_124(s, chan_id);
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/* insert command */
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s->data[0] = CMD_DVC_CLOSE_CHANNEL | cbChId;
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/* send command */
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bytes_in_stream = stream_length_before_p(s);
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send_channel_data(g_drdynvc_chan_id, s->data, bytes_in_stream);
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free_stream(s);
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return 0;
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}
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static int APP_CC
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drdynvc_process_close_channel_response(struct stream *s, unsigned char cmd)
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{
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uint32_t chan_id;
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drdynvc_get_chan_id(s, cmd, &chan_id);
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/* LK_TODO now do something using useful! */
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return 0;
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}
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/*
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* send data to client
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*
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* @param chan_id the virtual channel to write to
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* @param data data to write
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* @param data_size number of bytes to write
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*
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* @return 0 on success, -1 on failure
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******************************************************************************/
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int APP_CC drdynvc_write_data(uint32_t chan_id, char *data, int data_size)
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{
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struct stream *s;
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char *saved_ptr;
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int cbChId;
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int Len;
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int bytes_in_stream;
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int frag_size;
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if (data == NULL)
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{
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LOG(0, ("drdynvc_write_data: data is NULL\n"));
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return -1;
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}
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if (data_size <= 0)
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{
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return 0;
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}
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make_stream(s);
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init_stream(s, MAX_PDU_SIZE);
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/* this is a dummy write */
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out_uint8(s, 0);
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/* insert channel id */
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cbChId = drdynvc_insert_uint_124(s, chan_id);
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/* will data fit into one pkt? */
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bytes_in_stream = stream_length_before_p(s);
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if ((bytes_in_stream + data_size) <= MAX_PDU_SIZE)
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{
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/* yes it will - insert data */
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out_uint8p(s, data, data_size);
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/* insert command */
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s->data[0] = CMD_DVC_DATA | cbChId;
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/* write data to client */
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bytes_in_stream = stream_length_before_p(s);
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send_channel_data(g_drdynvc_chan_id, s->data, bytes_in_stream);
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free_stream(s);
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return 0;
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}
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/* no it won't - fragment it */
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saved_ptr = s->p;
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/* let client know how much data to expect */
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Len = drdynvc_insert_uint_124(s, data_size);
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/* insert data into first fragment */
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frag_size = MAX_PDU_SIZE - stream_length_before_p(s);
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out_uint8p(s, data, frag_size);
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/* insert command */
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s->data[0] = CMD_DVC_DATA_FIRST | Len << 2 | cbChId;
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/* write first fragment to client */
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bytes_in_stream = stream_length_before_p(s);
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send_channel_data(g_drdynvc_chan_id, s->data, bytes_in_stream);
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data_size -= frag_size;
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data += frag_size;
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s->data[0] = CMD_DVC_DATA | cbChId;
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s->p = saved_ptr;
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/* now send rest of the data using CMD_DVC_DATA */
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while (data_size > 0)
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{
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frag_size = MAX_PDU_SIZE - stream_length_before_p(s);
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if (frag_size > data_size)
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{
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frag_size = data_size;
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}
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out_uint8p(s, data, frag_size);
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bytes_in_stream = stream_length_before_p(s);
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send_channel_data(g_drdynvc_chan_id, s->data, bytes_in_stream);
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data_size -= frag_size;
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data += frag_size;
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s->p = saved_ptr;
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}
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free_stream(s);
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return 0;
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}
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static int APP_CC
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drdynvc_process_data_first(struct stream *s, unsigned char cmd)
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{
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struct xrdp_api_data *adp;
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struct stream *ls;
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uint32_t chan_id;
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int bytes_in_stream;
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int data_len;
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int Len;
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drdynvc_get_chan_id(s, cmd, &chan_id);
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Len = (cmd >> 2) & 0x03;
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if (Len == 0)
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{
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in_uint8(s, data_len);
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}
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else if (Len == 1)
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{
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in_uint16_le(s, data_len);
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}
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else
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{
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in_uint32_le(s, data_len);
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}
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bytes_in_stream = stream_length_after_p(s);
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/* get struct xrdp_api_data containing this channel id */
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if ((adp = struct_from_dvc_chan_id(chan_id)) == NULL)
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{
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LOG(0, ("drdynvc_process_data_first: error : "
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"could not find xrdp_api_data containing chan_id %d", chan_id));
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return -1;
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}
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ls = trans_get_out_s(adp->transp, MAX_PDU_SIZE);
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out_uint8p(ls, s->p, bytes_in_stream);
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s_mark_end(ls);
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trans_force_write(adp->transp);
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return 0;
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}
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static int APP_CC
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drdynvc_process_data(struct stream *s, unsigned char cmd)
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{
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struct xrdp_api_data *adp;
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struct stream *ls;
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uint32_t chan_id;
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int bytes_in_stream;
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drdynvc_get_chan_id(s, cmd, &chan_id);
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bytes_in_stream = stream_length_after_p(s);
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/* get struct xrdp_api_data containing this channel id */
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if ((adp = struct_from_dvc_chan_id(chan_id)) == NULL)
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{
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LOG(0, ("drdynvc_process_data: error : "
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"could not find xrdp_api_data containing chan_id %d", chan_id));
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return -1;
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}
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ls = trans_get_out_s(adp->transp, MAX_PDU_SIZE);
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out_uint8p(ls, s->p, bytes_in_stream);
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s_mark_end(ls);
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trans_force_write(adp->transp);
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return 0;
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}
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/**
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* process incoming data on a dynamic virtual channel
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*
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* @pram s stream containing the incoming data
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* @pram chand_id LK_TODO
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* @pram chan_flags LK_TODO
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* @pram length LK_TODO
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* @pram total_length LK_TODO
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*
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* @return 0 on success, -1 on failure
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******************************************************************************/
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int APP_CC
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drdynvc_data_in(struct stream *s, int chan_id, int chan_flags, int length,
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int total_length)
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{
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unsigned char cmd;
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in_uint8(s, cmd); /* read command */
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switch (cmd & 0xf0)
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{
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case CMD_DVC_CAPABILITY:
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drdynvc_process_capability_response(s, cmd);
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break;
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case CMD_DVC_OPEN_CHANNEL:
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drdynvc_process_open_channel_response(s, cmd);
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break;
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case CMD_DVC_CLOSE_CHANNEL:
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drdynvc_process_close_channel_response(s, cmd);
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break;
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case CMD_DVC_DATA_FIRST:
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drdynvc_process_data_first(s, cmd);
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break;
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case CMD_DVC_DATA:
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drdynvc_process_data(s, cmd);
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break;
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default:
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LOG(0, ("drdynvc_data_in: got unknown command 0x%x", cmd));
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break;
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}
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return 0;
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}
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/*
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* insert a byte, short or 32bit value into specified stream
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*
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* @param s stream used for insertion
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* @param val value to insert
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*
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* @return 0 for byte insertions
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* @return 1 for short insertion
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* @return 2 for uint32_t insertions
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******************************************************************************/
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static int APP_CC
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drdynvc_insert_uint_124(struct stream *s, uint32_t val)
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{
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int ret_val;
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if (val <= 0xff)
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{
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out_uint8(s, val);
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ret_val = 0;
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}
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else if (val <= 0xffff)
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{
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out_uint16_le(s, val);
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ret_val = 1;
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}
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else
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{
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out_uint32_le(s, val);
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ret_val = 2;
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}
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return ret_val;
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}
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/*
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* extract channel id from stream
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*
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* @param s stream containing channel id
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* @param cmd first byte in stream
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* @param chan_id return channel id here
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******************************************************************************/
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static int APP_CC
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drdynvc_get_chan_id(struct stream *s, char cmd, uint32_t *chan_id_p)
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{
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int cbChId;
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int chan_id;
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cbChId = cmd & 0x03;
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if (cbChId == 0)
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{
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in_uint8(s, chan_id);
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}
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else if (cbChId == 1)
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{
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in_uint16_le(s, chan_id);
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}
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else
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{
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in_uint32_le(s, chan_id);
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}
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*chan_id_p = chan_id;
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return 0;
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}
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