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/* |
/* |
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rdesktop: A Remote Desktop Protocol client. |
rdesktop: A Remote Desktop Protocol client. |
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Protocol services - ISO layer |
Protocol services - ISO layer |
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Copyright (C) Matthew Chapman 1999-2000 |
Copyright (C) Matthew Chapman 1999-2001 |
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This program is free software; you can redistribute it and/or modify |
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 |
it under the terms of the GNU General Public License as published by |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
*/ |
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#include "includes.h" |
#include "rdesktop.h" |
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/* Establish a connection up to the ISO layer */ |
/* Send a self-contained ISO PDU */ |
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HCONN iso_connect(char *server) |
static void |
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iso_send_msg(uint8 code) |
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{ |
{ |
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HCONN conn; |
STREAM s; |
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uint8 code; |
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if ((conn = tcp_connect(server)) == NULL) |
s = tcp_init(11); |
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return NULL; |
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out_uint8(s, 3); /* version */ |
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out_uint8(s, 0); /* reserved */ |
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out_uint16_be(s, 11); /* length */ |
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out_uint8(s, 6); /* hdrlen */ |
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out_uint8(s, code); |
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out_uint16(s, 0); /* dst_ref */ |
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out_uint16(s, 0); /* src_ref */ |
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out_uint8(s, 0); /* class */ |
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s_mark_end(s); |
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tcp_send(s); |
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} |
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iso_send_msg(conn, ISO_PDU_CR); |
/* Receive a message on the ISO layer, return code */ |
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static STREAM |
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iso_recv_msg(uint8 * code) |
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{ |
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STREAM s; |
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uint16 length; |
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uint8 version; |
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s = tcp_recv(4); |
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if (s == NULL) |
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return NULL; |
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if (!iso_recv_msg(conn, &code) || (code != ISO_PDU_CC)) |
in_uint8(s, version); |
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if (version != 3) |
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{ |
{ |
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ERROR("ISO error, expected CC\n"); |
error("TPKT v%d\n", version); |
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tcp_disconnect(conn); |
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return NULL; |
return NULL; |
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} |
} |
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return conn; |
in_uint8s(s, 1); /* pad */ |
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} |
in_uint16_be(s, length); |
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/* Disconnect from the ISO layer */ |
s = tcp_recv(length - 4); |
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void iso_disconnect(HCONN conn) |
if (s == NULL) |
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{ |
return NULL; |
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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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/* Send self-contained ISO message identified by code */ |
in_uint8s(s, 1); /* hdrlen */ |
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BOOL iso_send_msg(HCONN conn, uint8 code) |
in_uint8(s, *code); |
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{ |
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TPKT tpkt; |
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TPDU tpdu; |
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iso_make_tpkt(&tpkt, 11); |
if (*code == ISO_PDU_DT) |
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iso_io_tpkt(&conn->out, &tpkt); |
{ |
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iso_make_tpdu(&tpdu, code); |
in_uint8s(s, 1); /* eot */ |
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iso_io_tpdu(&conn->out, &tpdu); |
return s; |
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MARK_END(conn->out); |
} |
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return tcp_send(conn); |
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in_uint8s(s, 5); /* dst_ref, src_ref, class */ |
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return s; |
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} |
} |
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/* Receive a message on the ISO layer, return code */ |
/* Initialise ISO transport data packet */ |
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BOOL iso_recv_msg(HCONN conn, uint8 *code) |
STREAM |
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iso_init(int length) |
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{ |
{ |
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TPDU tpdu; |
STREAM s; |
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TPKT tpkt; |
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BOOL res; |
s = tcp_init(length + 7); |
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s_push_layer(s, iso_hdr, 7); |
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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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*code = tpdu.code; |
return s; |
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return res; |
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} |
} |
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/* Initialise ISO transport data packet */ |
/* Send an ISO data PDU */ |
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void iso_init(struct connection *conn) |
void |
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iso_send(STREAM s) |
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{ |
{ |
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PUSH_LAYER(conn->out, iso_offset, 7); |
uint16 length; |
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s_pop_layer(s, iso_hdr); |
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length = s->end - s->p; |
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out_uint8(s, 3); /* version */ |
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out_uint8(s, 0); /* reserved */ |
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out_uint16_be(s, length); |
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out_uint8(s, 2); /* hdrlen */ |
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out_uint8(s, ISO_PDU_DT); /* code */ |
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out_uint8(s, 0x80); /* eot */ |
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tcp_send(s); |
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} |
} |
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/* Receive ISO transport data packet */ |
/* Receive ISO transport data packet */ |
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BOOL iso_recv(HCONN conn) |
STREAM |
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iso_recv() |
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{ |
{ |
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STREAM s; |
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uint8 code; |
uint8 code; |
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if (!iso_recv_msg(conn, &code) || (code != ISO_PDU_DT)) |
s = iso_recv_msg(&code); |
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if (s == NULL) |
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return NULL; |
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if (code != ISO_PDU_DT) |
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{ |
{ |
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ERROR("ISO error, expected DT\n"); |
error("expected DT, got 0x%x\n", code); |
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return False; |
return NULL; |
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} |
} |
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return True; |
return s; |
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} |
} |
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/* Receive ISO transport data packet */ |
/* Establish a connection up to the ISO layer */ |
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BOOL iso_send(HCONN conn) |
BOOL |
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iso_connect(char *server) |
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{ |
{ |
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TPKT tpkt; |
uint8 code; |
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TPDU tpdu; |
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POP_LAYER(conn->out, iso_offset); |
if (!tcp_connect(server)) |
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iso_make_tpkt(&tpkt, conn->out.end); |
return False; |
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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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/* Initialise a TPKT structure */ |
iso_send_msg(ISO_PDU_CR); |
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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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/* Marshall/demarshall a TPKT structure */ |
if (iso_recv_msg(&code) == NULL) |
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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; |
return False; |
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if (tpkt->version != 3) |
if (code != ISO_PDU_CC) |
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{ |
{ |
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ERROR("Wrong TPKT version %d\n", tpkt->version); |
error("expected CC, got 0x%x\n", code); |
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tcp_disconnect(); |
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return False; |
return False; |
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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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if (!msb_io_uint16(s, &tpkt->length)) |
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return False; |
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return True; |
return True; |
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} |
} |
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/* Initialise a TPDU structure */ |
/* Disconnect from the ISO layer */ |
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void iso_make_tpdu(TPDU *tpdu, uint8 code) |
void |
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{ |
iso_disconnect() |
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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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/* 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; |
iso_send_msg(ISO_PDU_DR); |
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tcp_disconnect(); |
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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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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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return res; |
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} |
} |