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xrdp-proprietary/uirdesktop/mcs.c

470 lines
8.8 KiB

/* -*- c-basic-offset: 8 -*-
rdesktop: A Remote Desktop Protocol client.
Protocol services - Multipoint Communications Service
Copyright (C) Matthew Chapman 1999-2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "rdesktop.h"
uint16 g_mcs_userid;
extern VCHANNEL g_channels[];
extern unsigned int g_num_channels;
/* Parse an ASN.1 BER header */
static BOOL
ber_parse_header(STREAM s, int tagval, int *length)
{
int tag, len;
if (tagval > 0xff)
{
in_uint16_be(s, tag);
}
else
{
in_uint8(s, tag)}
if (tag != tagval)
{
error("expected tag %d, got %d\n", tagval, tag);
return False;
}
in_uint8(s, len);
if (len & 0x80)
{
len &= ~0x80;
*length = 0;
while (len--)
next_be(s, *length);
}
else
*length = len;
return s_check(s);
}
/* Output an ASN.1 BER header */
static void
ber_out_header(STREAM s, int tagval, int length)
{
if (tagval > 0xff)
{
out_uint16_be(s, tagval);
}
else
{
out_uint8(s, tagval);
}
if (length >= 0x80)
{
out_uint8(s, 0x82);
out_uint16_be(s, length);
}
else
out_uint8(s, length);
}
/* Output an ASN.1 BER integer */
static void
ber_out_integer(STREAM s, int value)
{
ber_out_header(s, BER_TAG_INTEGER, 2);
out_uint16_be(s, value);
}
/* Output a DOMAIN_PARAMS structure (ASN.1 BER) */
static void
mcs_out_domain_params(STREAM s, int max_channels, int max_users, int max_tokens, int max_pdusize)
{
ber_out_header(s, MCS_TAG_DOMAIN_PARAMS, 32);
ber_out_integer(s, max_channels);
ber_out_integer(s, max_users);
ber_out_integer(s, max_tokens);
ber_out_integer(s, 1); /* num_priorities */
ber_out_integer(s, 0); /* min_throughput */
ber_out_integer(s, 1); /* max_height */
ber_out_integer(s, max_pdusize);
ber_out_integer(s, 2); /* ver_protocol */
}
/* Parse a DOMAIN_PARAMS structure (ASN.1 BER) */
static BOOL
mcs_parse_domain_params(STREAM s)
{
int length;
ber_parse_header(s, MCS_TAG_DOMAIN_PARAMS, &length);
in_uint8s(s, length);
return s_check(s);
}
/* Send an MCS_CONNECT_INITIAL message (ASN.1 BER) */
static void
mcs_send_connect_initial(STREAM mcs_data)
{
int datalen = mcs_data->end - mcs_data->data;
int length = 9 + 3 * 34 + 4 + datalen;
STREAM s;
s = iso_init(length + 5);
ber_out_header(s, MCS_CONNECT_INITIAL, length);
ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* calling domain */
out_uint8(s, 1);
ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* called domain */
out_uint8(s, 1);
ber_out_header(s, BER_TAG_BOOLEAN, 1);
out_uint8(s, 0xff); /* upward flag */
mcs_out_domain_params(s, 34, 2, 0, 0xffff); /* target params */
mcs_out_domain_params(s, 1, 1, 1, 0x420); /* min params */
mcs_out_domain_params(s, 0xffff, 0xfc17, 0xffff, 0xffff); /* max params */
ber_out_header(s, BER_TAG_OCTET_STRING, datalen);
out_uint8p(s, mcs_data->data, datalen);
s_mark_end(s);
iso_send(s);
}
/* Expect a MCS_CONNECT_RESPONSE message (ASN.1 BER) */
static BOOL
mcs_recv_connect_response(STREAM mcs_data)
{
uint8 result;
int length;
STREAM s;
s = iso_recv(NULL);
if (s == NULL)
return False;
ber_parse_header(s, MCS_CONNECT_RESPONSE, &length);
ber_parse_header(s, BER_TAG_RESULT, &length);
in_uint8(s, result);
if (result != 0)
{
error("MCS connect: %d\n", result);
return False;
}
ber_parse_header(s, BER_TAG_INTEGER, &length);
in_uint8s(s, length); /* connect id */
mcs_parse_domain_params(s);
ber_parse_header(s, BER_TAG_OCTET_STRING, &length);
sec_process_mcs_data(s);
/*
if (length > mcs_data->size)
{
error("MCS data length %d, expected %d\n", length,
mcs_data->size);
length = mcs_data->size;
}
in_uint8a(s, mcs_data->data, length);
mcs_data->p = mcs_data->data;
mcs_data->end = mcs_data->data + length;
*/
return s_check_end(s);
}
/* Send an EDrq message (ASN.1 PER) */
static void
mcs_send_edrq(void)
{
STREAM s;
s = iso_init(5);
out_uint8(s, (MCS_EDRQ << 2));
out_uint16_be(s, 1); /* height */
out_uint16_be(s, 1); /* interval */
s_mark_end(s);
iso_send(s);
}
/* Send an AUrq message (ASN.1 PER) */
static void
mcs_send_aurq(void)
{
STREAM s;
s = iso_init(1);
out_uint8(s, (MCS_AURQ << 2));
s_mark_end(s);
iso_send(s);
}
/* Expect a AUcf message (ASN.1 PER) */
static BOOL
mcs_recv_aucf(uint16 * mcs_userid)
{
uint8 opcode, result;
STREAM s;
s = iso_recv(NULL);
if (s == NULL)
return False;
in_uint8(s, opcode);
if ((opcode >> 2) != MCS_AUCF)
{
error("expected AUcf, got %d\n", opcode);
return False;
}
in_uint8(s, result);
if (result != 0)
{
error("AUrq: %d\n", result);
return False;
}
if (opcode & 2)
in_uint16_be(s, *mcs_userid);
return s_check_end(s);
}
/* Send a CJrq message (ASN.1 PER) */
static void
mcs_send_cjrq(uint16 chanid)
{
STREAM s;
DEBUG_RDP5(("Sending CJRQ for channel #%d\n", chanid));
s = iso_init(5);
out_uint8(s, (MCS_CJRQ << 2));
out_uint16_be(s, g_mcs_userid);
out_uint16_be(s, chanid);
s_mark_end(s);
iso_send(s);
}
/* Expect a CJcf message (ASN.1 PER) */
static BOOL
mcs_recv_cjcf(void)
{
uint8 opcode, result;
STREAM s;
s = iso_recv(NULL);
if (s == NULL)
return False;
in_uint8(s, opcode);
if ((opcode >> 2) != MCS_CJCF)
{
error("expected CJcf, got %d\n", opcode);
return False;
}
in_uint8(s, result);
if (result != 0)
{
error("CJrq: %d\n", result);
return False;
}
in_uint8s(s, 4); /* mcs_userid, req_chanid */
if (opcode & 2)
in_uint8s(s, 2); /* join_chanid */
return s_check_end(s);
}
/* Initialise an MCS transport data packet */
STREAM
mcs_init(int length)
{
STREAM s;
s = iso_init(length + 8);
s_push_layer(s, mcs_hdr, 8);
return s;
}
/* Send an MCS transport data packet to a specific channel */
void
mcs_send_to_channel(STREAM s, uint16 channel)
{
uint16 length;
s_pop_layer(s, mcs_hdr);
length = s->end - s->p - 8;
length |= 0x8000;
out_uint8(s, (MCS_SDRQ << 2));
out_uint16_be(s, g_mcs_userid);
out_uint16_be(s, channel);
out_uint8(s, 0x70); /* flags */
out_uint16_be(s, length);
iso_send(s);
}
/* Send an MCS transport data packet to the global channel */
void
mcs_send(STREAM s)
{
mcs_send_to_channel(s, MCS_GLOBAL_CHANNEL);
}
/* Receive an MCS transport data packet */
STREAM
mcs_recv(uint16 * channel, uint8 * rdpver)
{
uint8 opcode, appid, length;
STREAM s;
s = iso_recv(rdpver);
if (s == NULL)
return NULL;
if (rdpver != NULL)
if (*rdpver != 3)
return s;
in_uint8(s, opcode);
appid = opcode >> 2;
if (appid != MCS_SDIN)
{
if (appid != MCS_DPUM)
{
error("expected data, got %d\n", opcode);
}
return NULL;
}
in_uint8s(s, 2); /* userid */
in_uint16_be(s, *channel);
in_uint8s(s, 1); /* flags */
in_uint8(s, length);
if (length & 0x80)
in_uint8s(s, 1); /* second byte of length */
return s;
}
/* Establish a connection up to the MCS layer */
BOOL
mcs_connect(char *server, STREAM mcs_data, char *username)
{
unsigned int i;
if (!iso_connect(server, username))
return False;
mcs_send_connect_initial(mcs_data);
if (!mcs_recv_connect_response(mcs_data))
goto error;
mcs_send_edrq();
mcs_send_aurq();
if (!mcs_recv_aucf(&g_mcs_userid))
goto error;
mcs_send_cjrq(g_mcs_userid + MCS_USERCHANNEL_BASE);
if (!mcs_recv_cjcf())
goto error;
mcs_send_cjrq(MCS_GLOBAL_CHANNEL);
if (!mcs_recv_cjcf())
goto error;
for (i = 0; i < g_num_channels; i++)
{
mcs_send_cjrq(g_channels[i].mcs_id);
if (!mcs_recv_cjcf())
goto error;
}
return True;
error:
iso_disconnect();
return False;
}
/* Establish a connection up to the MCS layer */
BOOL
mcs_reconnect(char *server, STREAM mcs_data)
{
unsigned int i;
if (!iso_reconnect(server))
return False;
mcs_send_connect_initial(mcs_data);
if (!mcs_recv_connect_response(mcs_data))
goto error;
mcs_send_edrq();
mcs_send_aurq();
if (!mcs_recv_aucf(&g_mcs_userid))
goto error;
mcs_send_cjrq(g_mcs_userid + MCS_USERCHANNEL_BASE);
if (!mcs_recv_cjcf())
goto error;
mcs_send_cjrq(MCS_GLOBAL_CHANNEL);
if (!mcs_recv_cjcf())
goto error;
for (i = 0; i < g_num_channels; i++)
{
mcs_send_cjrq(g_channels[i].mcs_id);
if (!mcs_recv_cjcf())
goto error;
}
return True;
error:
iso_disconnect();
return False;
}
/* Disconnect from the MCS layer */
void
mcs_disconnect(void)
{
iso_disconnect();
}
/* reset the state of the mcs layer */
void
mcs_reset_state(void)
{
g_mcs_userid = 0;
iso_reset_state();
}