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/* |
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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 1999-2001 |
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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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|
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uint16 mcs_userid; |
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|
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/* Parse an ASN.1 BER header */ |
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static 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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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; |
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} |
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|
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in_uint8(s, len); |
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|
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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 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 = 7 + 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, 0); /* calling domain */ |
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ber_out_header(s, BER_TAG_OCTET_STRING, 0); /* called domain */ |
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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, 2, 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 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(); |
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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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if (length > mcs_data->size) |
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{ |
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error("MCS data length %d\n", length); |
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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() |
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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() |
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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 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(); |
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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) */ |
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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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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, 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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} |
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|
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/* Expect a CJcf message (ASN.1 PER) */ |
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static BOOL |
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mcs_recv_cjcf() |
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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(); |
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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_CJCF) |
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{ |
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error("expected CJcf, 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("CJrq: %d\n", result); |
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return False; |
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} |
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|
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in_uint8s(s, 4); /* mcs_userid, req_chanid */ |
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if (opcode & 2) |
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in_uint8s(s, 2); /* join_chanid */ |
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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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/* Initialise an MCS transport data packet */ |
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STREAM |
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mcs_init(int length) |
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{ |
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STREAM s; |
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|
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s = iso_init(length + 8); |
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s_push_layer(s, mcs_hdr, 8); |
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|
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return s; |
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} |
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|
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/* Send an MCS transport data packet */ |
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void |
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mcs_send(STREAM s) |
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{ |
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uint16 length; |
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|
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s_pop_layer(s, mcs_hdr); |
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length = s->end - s->p - 8; |
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length |= 0x8000; |
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|
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out_uint8(s, (MCS_SDRQ << 2)); |
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out_uint16_be(s, mcs_userid); |
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out_uint16_be(s, MCS_GLOBAL_CHANNEL); |
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out_uint8(s, 0x70); /* flags */ |
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out_uint16_be(s, length); |
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|
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iso_send(s); |
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} |
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|
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/* Receive an MCS transport data packet */ |
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STREAM |
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mcs_recv() |
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{ |
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uint8 opcode, appid, length; |
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STREAM s; |
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|
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s = iso_recv(); |
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if (s == NULL) |
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return NULL; |
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|
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in_uint8(s, opcode); |
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appid = opcode >> 2; |
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if (appid != MCS_SDIN) |
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{ |
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if (appid != MCS_DPUM) |
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{ |
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error("expected data, got %d\n", opcode); |
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} |
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return NULL; |
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} |
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|
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in_uint8s(s, 5); /* userid, chanid, flags */ |
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in_uint8(s, length); |
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if (length & 0x80) |
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in_uint8s(s, 1); /* second byte of length */ |
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|
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return s; |
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} |
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|
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/* Establish a connection up to the MCS layer */ |
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BOOL |
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mcs_connect(char *server, STREAM mcs_data) |
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{ |
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if (!iso_connect(server)) |
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return False; |
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|
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mcs_send_connect_initial(mcs_data); |
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if (!mcs_recv_connect_response(mcs_data)) |
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goto error; |
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|
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mcs_send_edrq(); |
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|
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mcs_send_aurq(); |
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if (!mcs_recv_aucf(&mcs_userid)) |
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goto error; |
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|
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mcs_send_cjrq(mcs_userid + 1001); |
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if (!mcs_recv_cjcf()) |
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goto error; |
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|
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mcs_send_cjrq(MCS_GLOBAL_CHANNEL); |
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if (!mcs_recv_cjcf()) |
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goto error; |
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|
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return True; |
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|
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error: |
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iso_disconnect(); |
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return False; |
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} |
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|
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/* Disconnect from the MCS layer */ |
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void |
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mcs_disconnect() |
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{ |
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iso_disconnect(); |
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} |
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