Diffstat (limited to 'noncore/net/opierdesktop/mcs.cpp') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | noncore/net/opierdesktop/mcs.cpp | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/noncore/net/opierdesktop/mcs.cpp b/noncore/net/opierdesktop/mcs.cpp new file mode 100644 index 0000000..8877d62 --- a/dev/null +++ b/noncore/net/opierdesktop/mcs.cpp @@ -0,0 +1,394 @@ +/* + rdesktop: A Remote Desktop Protocol client. + Protocol services - Multipoint Communications Service + Copyright (C) Matthew Chapman 1999-2002 + + 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 mcs_userid; + +/* Parse an ASN.1 BER header */ +static BOOL +ber_parse_header(STREAM s, int tagval, unsigned 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) +{ + unsigned 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 = 7 + 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, 0); /* calling domain */ + ber_out_header(s, BER_TAG_OCTET_STRING, 0); /* called domain */ + + ber_out_header(s, BER_TAG_BOOLEAN, 1); + out_uint8(s, 0xff); /* upward flag */ + + mcs_out_domain_params(s, 2, 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; + unsigned int length; + STREAM s; + + s = iso_recv(); + 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); + if (length > mcs_data->size) + { + error("MCS data length %d\n", length); + 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(); + 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; + + s = iso_init(5); + + out_uint8(s, (MCS_CJRQ << 2)); + out_uint16_be(s, 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(); + 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 */ +void +mcs_send(STREAM s) +{ + 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, mcs_userid); + out_uint16_be(s, MCS_GLOBAL_CHANNEL); + out_uint8(s, 0x70); /* flags */ + out_uint16_be(s, length); + + iso_send(s); +} + +/* Receive an MCS transport data packet */ +STREAM +mcs_recv(void) +{ + uint8 opcode, appid, length; + STREAM s; + + s = iso_recv(); + if (s == NULL) + return NULL; + + 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, 5); /* userid, chanid, 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) +{ + if (!iso_connect(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(&mcs_userid)) + goto error; + + mcs_send_cjrq(mcs_userid + 1001); + if (!mcs_recv_cjcf()) + goto error; + + mcs_send_cjrq(MCS_GLOBAL_CHANNEL); + if (!mcs_recv_cjcf()) + goto error; + + return True; + + error: + iso_disconnect(); + return False; +} + +/* Disconnect from the MCS layer */ +void +mcs_disconnect(void) +{ + iso_disconnect(); +} |