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/* -*- c-basic-offset: 8 -*- |
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rdesktop: A Remote Desktop Protocol client. |
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Protocol services - Multipoint Communications Service |
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Copyright (C) Matthew Chapman 1999-2008 |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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|
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#include "rdesktop.h" |
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|
| 23 |
uint16 g_mcs_userid; |
| 24 |
extern VCHANNEL g_channels[]; |
| 25 |
extern unsigned int g_num_channels; |
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|
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/* Parse an ASN.1 BER header */ |
| 28 |
static RD_BOOL |
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ber_parse_header(STREAM s, int tagval, int *length) |
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{ |
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int tag, len; |
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|
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if (tagval > 0xff) |
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{ |
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in_uint16_be(s, tag); |
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} |
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else |
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{ |
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in_uint8(s, tag); |
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} |
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|
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if (tag != tagval) |
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{ |
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error("expected tag %d, got %d\n", tagval, tag); |
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return False; |
| 46 |
} |
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|
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in_uint8(s, len); |
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|
| 50 |
if (len & 0x80) |
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{ |
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len &= ~0x80; |
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*length = 0; |
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while (len--) |
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next_be(s, *length); |
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} |
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else |
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*length = len; |
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|
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return s_check(s); |
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} |
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|
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/* Output an ASN.1 BER header */ |
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static void |
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ber_out_header(STREAM s, int tagval, int length) |
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{ |
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if (tagval > 0xff) |
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{ |
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out_uint16_be(s, tagval); |
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} |
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else |
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{ |
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out_uint8(s, tagval); |
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} |
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|
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if (length >= 0x80) |
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{ |
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out_uint8(s, 0x82); |
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out_uint16_be(s, length); |
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} |
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else |
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out_uint8(s, length); |
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} |
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|
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/* Output an ASN.1 BER integer */ |
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static void |
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ber_out_integer(STREAM s, int value) |
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{ |
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ber_out_header(s, BER_TAG_INTEGER, 2); |
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out_uint16_be(s, value); |
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} |
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|
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/* Output a DOMAIN_PARAMS structure (ASN.1 BER) */ |
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static void |
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mcs_out_domain_params(STREAM s, int max_channels, int max_users, int max_tokens, int max_pdusize) |
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{ |
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ber_out_header(s, MCS_TAG_DOMAIN_PARAMS, 32); |
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ber_out_integer(s, max_channels); |
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ber_out_integer(s, max_users); |
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ber_out_integer(s, max_tokens); |
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ber_out_integer(s, 1); /* num_priorities */ |
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ber_out_integer(s, 0); /* min_throughput */ |
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ber_out_integer(s, 1); /* max_height */ |
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ber_out_integer(s, max_pdusize); |
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ber_out_integer(s, 2); /* ver_protocol */ |
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} |
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|
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/* Parse a DOMAIN_PARAMS structure (ASN.1 BER) */ |
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static RD_BOOL |
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mcs_parse_domain_params(STREAM s) |
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{ |
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int length; |
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|
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ber_parse_header(s, MCS_TAG_DOMAIN_PARAMS, &length); |
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in_uint8s(s, length); |
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|
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return s_check(s); |
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} |
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|
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/* Send an MCS_CONNECT_INITIAL message (ASN.1 BER) */ |
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static void |
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mcs_send_connect_initial(STREAM mcs_data) |
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{ |
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int datalen = mcs_data->end - mcs_data->data; |
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int length = 9 + 3 * 34 + 4 + datalen; |
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STREAM s; |
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|
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s = iso_init(length + 5); |
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|
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ber_out_header(s, MCS_CONNECT_INITIAL, length); |
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ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* calling domain */ |
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out_uint8(s, 1); |
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ber_out_header(s, BER_TAG_OCTET_STRING, 1); /* called domain */ |
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out_uint8(s, 1); |
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|
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ber_out_header(s, BER_TAG_BOOLEAN, 1); |
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out_uint8(s, 0xff); /* upward flag */ |
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|
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mcs_out_domain_params(s, 34, 2, 0, 0xffff); /* target params */ |
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mcs_out_domain_params(s, 1, 1, 1, 0x420); /* min params */ |
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mcs_out_domain_params(s, 0xffff, 0xfc17, 0xffff, 0xffff); /* max params */ |
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|
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ber_out_header(s, BER_TAG_OCTET_STRING, datalen); |
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out_uint8p(s, mcs_data->data, datalen); |
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|
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s_mark_end(s); |
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iso_send(s); |
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} |
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|
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/* Expect a MCS_CONNECT_RESPONSE message (ASN.1 BER) */ |
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static RD_BOOL |
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mcs_recv_connect_response(STREAM mcs_data) |
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{ |
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uint8 result; |
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int length; |
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STREAM s; |
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|
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s = iso_recv(NULL); |
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if (s == NULL) |
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return False; |
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|
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ber_parse_header(s, MCS_CONNECT_RESPONSE, &length); |
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|
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ber_parse_header(s, BER_TAG_RESULT, &length); |
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in_uint8(s, result); |
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if (result != 0) |
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{ |
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error("MCS connect: %d\n", result); |
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return False; |
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} |
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|
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ber_parse_header(s, BER_TAG_INTEGER, &length); |
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in_uint8s(s, length); /* connect id */ |
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mcs_parse_domain_params(s); |
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|
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ber_parse_header(s, BER_TAG_OCTET_STRING, &length); |
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|
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sec_process_mcs_data(s); |
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/* |
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if (length > mcs_data->size) |
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{ |
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error("MCS data length %d, expected %d\n", length, |
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mcs_data->size); |
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length = mcs_data->size; |
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} |
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|
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in_uint8a(s, mcs_data->data, length); |
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mcs_data->p = mcs_data->data; |
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mcs_data->end = mcs_data->data + length; |
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*/ |
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return s_check_end(s); |
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} |
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|
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/* Send an EDrq message (ASN.1 PER) */ |
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static void |
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mcs_send_edrq(void) |
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{ |
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STREAM s; |
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|
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s = iso_init(5); |
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|
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out_uint8(s, (MCS_EDRQ << 2)); |
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out_uint16_be(s, 1); /* height */ |
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out_uint16_be(s, 1); /* interval */ |
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|
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s_mark_end(s); |
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iso_send(s); |
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} |
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|
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/* Send an AUrq message (ASN.1 PER) */ |
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static void |
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mcs_send_aurq(void) |
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{ |
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STREAM s; |
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|
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s = iso_init(1); |
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|
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out_uint8(s, (MCS_AURQ << 2)); |
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|
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s_mark_end(s); |
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iso_send(s); |
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} |
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|
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/* Expect a AUcf message (ASN.1 PER) */ |
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static RD_BOOL |
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mcs_recv_aucf(uint16 * mcs_userid) |
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{ |
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uint8 opcode, result; |
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STREAM s; |
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|
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s = iso_recv(NULL); |
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if (s == NULL) |
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return False; |
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|
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in_uint8(s, opcode); |
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if ((opcode >> 2) != MCS_AUCF) |
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{ |
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error("expected AUcf, got %d\n", opcode); |
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return False; |
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} |
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|
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in_uint8(s, result); |
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if (result != 0) |
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{ |
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error("AUrq: %d\n", result); |
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return False; |
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} |
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|
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if (opcode & 2) |
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in_uint16_be(s, *mcs_userid); |
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|
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return s_check_end(s); |
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} |
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|
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/* Send a CJrq message (ASN.1 PER) */ |
| 256 |
static void |
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mcs_send_cjrq(uint16 chanid) |
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{ |
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STREAM s; |
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|
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DEBUG_RDP5(("Sending CJRQ for channel #%d\n", chanid)); |
| 262 |
|
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s = iso_init(5); |
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|
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out_uint8(s, (MCS_CJRQ << 2)); |
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out_uint16_be(s, g_mcs_userid); |
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out_uint16_be(s, chanid); |
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|
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s_mark_end(s); |
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iso_send(s); |
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} |
| 272 |
|
| 273 |
/* Expect a CJcf message (ASN.1 PER) */ |
| 274 |
static RD_BOOL |
| 275 |
mcs_recv_cjcf(void) |
| 276 |
{ |
| 277 |
uint8 opcode, result; |
| 278 |
STREAM s; |
| 279 |
|
| 280 |
s = iso_recv(NULL); |
| 281 |
if (s == NULL) |
| 282 |
return False; |
| 283 |
|
| 284 |
in_uint8(s, opcode); |
| 285 |
if ((opcode >> 2) != MCS_CJCF) |
| 286 |
{ |
| 287 |
error("expected CJcf, got %d\n", opcode); |
| 288 |
return False; |
| 289 |
} |
| 290 |
|
| 291 |
in_uint8(s, result); |
| 292 |
if (result != 0) |
| 293 |
{ |
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error("CJrq: %d\n", result); |
| 295 |
return False; |
| 296 |
} |
| 297 |
|
| 298 |
in_uint8s(s, 4); /* mcs_userid, req_chanid */ |
| 299 |
if (opcode & 2) |
| 300 |
in_uint8s(s, 2); /* join_chanid */ |
| 301 |
|
| 302 |
return s_check_end(s); |
| 303 |
} |
| 304 |
|
| 305 |
/* Initialise an MCS transport data packet */ |
| 306 |
STREAM |
| 307 |
mcs_init(int length) |
| 308 |
{ |
| 309 |
STREAM s; |
| 310 |
|
| 311 |
s = iso_init(length + 8); |
| 312 |
s_push_layer(s, mcs_hdr, 8); |
| 313 |
|
| 314 |
return s; |
| 315 |
} |
| 316 |
|
| 317 |
/* Send an MCS transport data packet to a specific channel */ |
| 318 |
void |
| 319 |
mcs_send_to_channel(STREAM s, uint16 channel) |
| 320 |
{ |
| 321 |
uint16 length; |
| 322 |
|
| 323 |
s_pop_layer(s, mcs_hdr); |
| 324 |
length = s->end - s->p - 8; |
| 325 |
length |= 0x8000; |
| 326 |
|
| 327 |
out_uint8(s, (MCS_SDRQ << 2)); |
| 328 |
out_uint16_be(s, g_mcs_userid); |
| 329 |
out_uint16_be(s, channel); |
| 330 |
out_uint8(s, 0x70); /* flags */ |
| 331 |
out_uint16_be(s, length); |
| 332 |
|
| 333 |
iso_send(s); |
| 334 |
} |
| 335 |
|
| 336 |
/* Send an MCS transport data packet to the global channel */ |
| 337 |
void |
| 338 |
mcs_send(STREAM s) |
| 339 |
{ |
| 340 |
mcs_send_to_channel(s, MCS_GLOBAL_CHANNEL); |
| 341 |
} |
| 342 |
|
| 343 |
/* Receive an MCS transport data packet */ |
| 344 |
STREAM |
| 345 |
mcs_recv(uint16 * channel, uint8 * rdpver) |
| 346 |
{ |
| 347 |
uint8 opcode, appid, length; |
| 348 |
STREAM s; |
| 349 |
|
| 350 |
s = iso_recv(rdpver); |
| 351 |
if (s == NULL) |
| 352 |
return NULL; |
| 353 |
if (rdpver != NULL) |
| 354 |
if (*rdpver != 3) |
| 355 |
return s; |
| 356 |
in_uint8(s, opcode); |
| 357 |
appid = opcode >> 2; |
| 358 |
if (appid != MCS_SDIN) |
| 359 |
{ |
| 360 |
if (appid != MCS_DPUM) |
| 361 |
{ |
| 362 |
error("expected data, got %d\n", opcode); |
| 363 |
} |
| 364 |
return NULL; |
| 365 |
} |
| 366 |
in_uint8s(s, 2); /* userid */ |
| 367 |
in_uint16_be(s, *channel); |
| 368 |
in_uint8s(s, 1); /* flags */ |
| 369 |
in_uint8(s, length); |
| 370 |
if (length & 0x80) |
| 371 |
in_uint8s(s, 1); /* second byte of length */ |
| 372 |
return s; |
| 373 |
} |
| 374 |
|
| 375 |
/* Establish a connection up to the MCS layer */ |
| 376 |
RD_BOOL |
| 377 |
mcs_connect(char *server, STREAM mcs_data, char *username) |
| 378 |
{ |
| 379 |
unsigned int i; |
| 380 |
|
| 381 |
if (!iso_connect(server, username)) |
| 382 |
return False; |
| 383 |
|
| 384 |
mcs_send_connect_initial(mcs_data); |
| 385 |
if (!mcs_recv_connect_response(mcs_data)) |
| 386 |
goto error; |
| 387 |
|
| 388 |
mcs_send_edrq(); |
| 389 |
|
| 390 |
mcs_send_aurq(); |
| 391 |
if (!mcs_recv_aucf(&g_mcs_userid)) |
| 392 |
goto error; |
| 393 |
|
| 394 |
mcs_send_cjrq(g_mcs_userid + MCS_USERCHANNEL_BASE); |
| 395 |
|
| 396 |
if (!mcs_recv_cjcf()) |
| 397 |
goto error; |
| 398 |
|
| 399 |
mcs_send_cjrq(MCS_GLOBAL_CHANNEL); |
| 400 |
if (!mcs_recv_cjcf()) |
| 401 |
goto error; |
| 402 |
|
| 403 |
for (i = 0; i < g_num_channels; i++) |
| 404 |
{ |
| 405 |
mcs_send_cjrq(g_channels[i].mcs_id); |
| 406 |
if (!mcs_recv_cjcf()) |
| 407 |
goto error; |
| 408 |
} |
| 409 |
return True; |
| 410 |
|
| 411 |
error: |
| 412 |
iso_disconnect(); |
| 413 |
return False; |
| 414 |
} |
| 415 |
|
| 416 |
/* Establish a connection up to the MCS layer */ |
| 417 |
RD_BOOL |
| 418 |
mcs_reconnect(char *server, STREAM mcs_data) |
| 419 |
{ |
| 420 |
unsigned int i; |
| 421 |
|
| 422 |
if (!iso_reconnect(server)) |
| 423 |
return False; |
| 424 |
|
| 425 |
mcs_send_connect_initial(mcs_data); |
| 426 |
if (!mcs_recv_connect_response(mcs_data)) |
| 427 |
goto error; |
| 428 |
|
| 429 |
mcs_send_edrq(); |
| 430 |
|
| 431 |
mcs_send_aurq(); |
| 432 |
if (!mcs_recv_aucf(&g_mcs_userid)) |
| 433 |
goto error; |
| 434 |
|
| 435 |
mcs_send_cjrq(g_mcs_userid + MCS_USERCHANNEL_BASE); |
| 436 |
|
| 437 |
if (!mcs_recv_cjcf()) |
| 438 |
goto error; |
| 439 |
|
| 440 |
mcs_send_cjrq(MCS_GLOBAL_CHANNEL); |
| 441 |
if (!mcs_recv_cjcf()) |
| 442 |
goto error; |
| 443 |
|
| 444 |
for (i = 0; i < g_num_channels; i++) |
| 445 |
{ |
| 446 |
mcs_send_cjrq(g_channels[i].mcs_id); |
| 447 |
if (!mcs_recv_cjcf()) |
| 448 |
goto error; |
| 449 |
} |
| 450 |
return True; |
| 451 |
|
| 452 |
error: |
| 453 |
iso_disconnect(); |
| 454 |
return False; |
| 455 |
} |
| 456 |
|
| 457 |
/* Disconnect from the MCS layer */ |
| 458 |
void |
| 459 |
mcs_disconnect(void) |
| 460 |
{ |
| 461 |
iso_disconnect(); |
| 462 |
} |
| 463 |
|
| 464 |
/* reset the state of the mcs layer */ |
| 465 |
void |
| 466 |
mcs_reset_state(void) |
| 467 |
{ |
| 468 |
g_mcs_userid = 0; |
| 469 |
iso_reset_state(); |
| 470 |
} |
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