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/* |
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rdesktop: A Remote Desktop Protocol client. |
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Protocol services - ISO layer |
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Copyright (C) Matthew Chapman 1999-2000 |
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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 "includes.h" |
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|
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/* Establish a connection up to the ISO layer */ |
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HCONN iso_connect(char *server) |
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{ |
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HCONN conn; |
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uint8 code; |
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|
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if ((conn = tcp_connect(server)) == NULL) |
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return NULL; |
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|
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iso_send_msg(conn, ISO_PDU_CR); |
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|
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if (!iso_recv_msg(conn, &code) || (code != ISO_PDU_CC)) |
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{ |
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ERROR("ISO error, expected CC\n"); |
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tcp_disconnect(conn); |
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return NULL; |
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} |
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|
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return conn; |
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} |
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|
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/* Disconnect from the ISO layer */ |
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void iso_disconnect(HCONN conn) |
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{ |
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iso_send_msg(conn, ISO_PDU_DR); |
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tcp_disconnect(conn); |
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} |
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|
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/* Send self-contained ISO message identified by code */ |
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BOOL iso_send_msg(HCONN conn, uint8 code) |
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{ |
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TPKT tpkt; |
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TPDU tpdu; |
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|
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iso_make_tpkt(&tpkt, 11); |
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iso_io_tpkt(&conn->out, &tpkt); |
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iso_make_tpdu(&tpdu, code); |
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iso_io_tpdu(&conn->out, &tpdu); |
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MARK_END(conn->out); |
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return tcp_send(conn); |
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} |
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|
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/* Receive a message on the ISO layer, return code */ |
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BOOL iso_recv_msg(HCONN conn, uint8 *code) |
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{ |
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TPDU tpdu; |
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TPKT tpkt; |
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BOOL res; |
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|
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res = tcp_recv(conn, 4); |
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res = res ? iso_io_tpkt(&conn->in, &tpkt) : False; |
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res = res ? tcp_recv(conn, tpkt.length - 4) : False; |
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res = res ? iso_io_tpdu(&conn->in, &tpdu) : False; |
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|
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*code = tpdu.code; |
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return res; |
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} |
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|
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/* Initialise ISO transport data packet */ |
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void iso_init(struct connection *conn) |
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{ |
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PUSH_LAYER(conn->out, iso_offset, 7); |
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} |
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|
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/* Receive ISO transport data packet */ |
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BOOL iso_recv(HCONN conn) |
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{ |
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uint8 code; |
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|
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if (!iso_recv_msg(conn, &code) || (code != ISO_PDU_DT)) |
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{ |
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ERROR("ISO error, expected DT\n"); |
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return False; |
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} |
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|
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return True; |
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} |
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|
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/* Receive ISO transport data packet */ |
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BOOL iso_send(HCONN conn) |
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{ |
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TPKT tpkt; |
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TPDU tpdu; |
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|
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POP_LAYER(conn->out, iso_offset); |
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iso_make_tpkt(&tpkt, conn->out.end); |
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iso_io_tpkt(&conn->out, &tpkt); |
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iso_make_tpdu(&tpdu, ISO_PDU_DT); |
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iso_io_tpdu(&conn->out, &tpdu); |
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return tcp_send(conn); |
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} |
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|
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/* Initialise a TPKT structure */ |
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void iso_make_tpkt(TPKT *tpkt, int length) |
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{ |
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tpkt->version = 3; |
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tpkt->reserved = 0; |
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tpkt->length = length; |
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} |
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|
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/* Marshall/demarshall a TPKT structure */ |
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BOOL iso_io_tpkt(STREAM s, TPKT *tpkt) |
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{ |
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if (!prs_io_uint8(s, &tpkt->version)) |
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return False; |
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|
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if (tpkt->version != 3) |
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{ |
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ERROR("Wrong TPKT version %d\n", tpkt->version); |
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return False; |
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} |
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|
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if (!prs_io_uint8 (s, &tpkt->reserved)) |
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return False; |
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|
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if (!msb_io_uint16(s, &tpkt->length)) |
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return False; |
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|
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return True; |
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} |
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|
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/* Initialise a TPDU structure */ |
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void iso_make_tpdu(TPDU *tpdu, uint8 code) |
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{ |
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tpdu->hlen = (code == ISO_PDU_DT) ? 2 : 6; |
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tpdu->code = code; |
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tpdu->dst_ref = tpdu->src_ref = 0; |
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tpdu->class = 0; |
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tpdu->eot = 0x80; |
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} |
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|
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/* Marshall/demarshall a TPDU structure */ |
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BOOL iso_io_tpdu(STREAM s, TPDU *tpdu) |
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{ |
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BOOL res = True; |
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|
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res = res ? prs_io_uint8 (s, &tpdu->hlen) : False; |
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res = res ? prs_io_uint8 (s, &tpdu->code) : False; |
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|
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if (tpdu->code == ISO_PDU_DT) |
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{ |
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res = res ? prs_io_uint8(s, &tpdu->eot) : False; |
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} |
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else |
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{ |
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res = res ? msb_io_uint16(s, &tpdu->dst_ref) : False; |
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res = res ? msb_io_uint16(s, &tpdu->src_ref) : False; |
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res = res ? prs_io_uint8 (s, &tpdu->class ) : False; |
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} |
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|
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return res; |
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} |
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