175 lines
3.8 KiB
C
175 lines
3.8 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Client
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* RDP Core
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*
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* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@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 "rdp.h"
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/**
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* Read RDP Security Header.\n
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* @msdn{cc240579}
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* @param s stream
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* @param flags security flags
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*/
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void rdp_read_security_header(STREAM* s, uint16* flags)
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{
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/* Basic Security Header */
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stream_read_uint16(s, *flags); /* flags */
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stream_seek(s, 2); /* flagsHi (unused) */
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}
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/**
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* Write RDP Security Header.\n
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* @msdn{cc240579}
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* @param s stream
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* @param flags security flags
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*/
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void rdp_write_security_header(STREAM* s, uint16 flags)
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{
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/* Basic Security Header */
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stream_write_uint16(s, flags); /* flags */
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stream_write_uint16(s, 0); /* flagsHi (unused) */
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}
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/**
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* Initialize an RDP packet stream.\n
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* @param rdp rdp module
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* @return
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*/
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STREAM* rdp_send_stream_init(rdpRdp* rdp)
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{
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STREAM* s;
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s = transport_send_stream_init(rdp->transport, 1024);
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stream_seek(s, RDP_PACKET_HEADER_LENGTH);
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return s;
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}
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/**
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* Send an RDP packet.\n
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* @param rdp RDP module
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* @param s stream
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*/
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void rdp_send(rdpRdp* rdp, STREAM* s)
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{
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int length;
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length = stream_get_length(s);
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stream_set_pos(s, 0);
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mcs_write_domain_mcspdu_header(s, DomainMCSPDU_SendDataRequest, length);
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per_write_integer16(s, rdp->mcs->user_id, MCS_BASE_CHANNEL_ID); /* initiator */
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per_write_integer16(s, MCS_GLOBAL_CHANNEL_ID, 0); /* channelId */
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stream_write_uint8(s, 0x70); /* dataPriority + segmentation */
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per_write_length(s, length - RDP_PACKET_HEADER_LENGTH); /* userData (OCTET_STRING) */
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stream_set_pos(s, length);
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transport_write(rdp->transport, s);
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}
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/**
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* Receive an RDP packet.\n
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* @param rdp RDP module
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*/
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void rdp_recv(rdpRdp* rdp)
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{
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STREAM* s;
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int length;
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int pduLength;
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uint16 initiator;
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uint16 channelId;
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uint16 sec_flags;
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enum DomainMCSPDU MCSPDU;
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s = transport_recv_stream_init(rdp->transport, 4096);
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transport_read(rdp->transport, s);
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MCSPDU = DomainMCSPDU_SendDataIndication;
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mcs_read_domain_mcspdu_header(s, &MCSPDU, &length);
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per_read_integer16(s, &initiator, MCS_BASE_CHANNEL_ID); /* initiator (UserId) */
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per_read_integer16(s, &channelId, 0); /* channelId */
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stream_seek(s, 1); /* dataPriority + Segmentation (0x70) */
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per_read_length(s, &pduLength); /* userData (OCTET_STRING) */
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rdp_read_security_header(s, &sec_flags);
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if (sec_flags & SEC_PKT_MASK)
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{
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switch (sec_flags & SEC_PKT_MASK)
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{
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case SEC_LICENSE_PKT:
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license_recv(rdp->license, s, sec_flags);
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break;
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case SEC_REDIRECTION_PKT:
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rdp_read_redirection_packet(rdp, s, sec_flags);
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break;
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default:
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printf("incorrect security flags: 0x%02X\n", sec_flags);
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break;
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}
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}
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}
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/**
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* Instantiate new RDP module.
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* @return new RDP module
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*/
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rdpRdp* rdp_new()
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{
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rdpRdp* rdp;
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rdp = (rdpRdp*) xzalloc(sizeof(rdpRdp));
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if (rdp != NULL)
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{
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rdp->settings = settings_new();
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rdp->transport = transport_new(rdp->settings);
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rdp->license = license_new(rdp->license);
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rdp->nego = nego_new(rdp->transport);
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rdp->mcs = mcs_new(rdp->transport);
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}
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return rdp;
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}
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/**
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* Free RDP module.
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* @param rdp RDP module to be freed
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*/
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void rdp_free(rdpRdp* rdp)
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{
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if (rdp != NULL)
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{
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settings_free(rdp->settings);
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transport_free(rdp->transport);
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license_free(rdp->license);
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mcs_free(rdp->mcs);
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xfree(rdp);
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}
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}
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