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/*
rdesktop: A Remote Desktop Protocol client.
Protocol services - ISO layer
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"
/* Send a self-contained ISO PDU */
static void
iso_send_msg(uint8 code)
{
STREAM s;
s = tcp_init(11);
out_uint8(s, 3); /* version */
out_uint8(s, 0); /* reserved */
out_uint16_be(s, 11); /* length */
out_uint8(s, 6); /* hdrlen */
out_uint8(s, code);
out_uint16(s, 0); /* dst_ref */
out_uint16(s, 0); /* src_ref */
out_uint8(s, 0); /* class */
s_mark_end(s);
tcp_send(s);
}
/* Receive a message on the ISO layer, return code */
static STREAM
iso_recv_msg(uint8 * code)
{
STREAM s;
uint16 length;
uint8 version;
s = tcp_recv(4);
if (s == NULL)
{
return NULL;
}
in_uint8(s, version);
if (version != 3)
{
error("TPKT v%d\n", version);
return NULL;
}
in_uint8s(s, 1); /* pad */
in_uint16_be(s, length);
s = tcp_recv(length - 4);
if (s == NULL)
return NULL;
in_uint8s(s, 1); /* hdrlen */
in_uint8(s, *code);
if (*code == ISO_PDU_DT)
{
in_uint8s(s, 1); /* eot */
return s;
}
in_uint8s(s, 5); /* dst_ref, src_ref, class */
return s;
}
/* Initialise ISO transport data packet */
STREAM
iso_init(int length)
{
STREAM s;
s = tcp_init(length + 7);
s_push_layer(s, iso_hdr, 7);
return s;
}
/* Send an ISO data PDU */
void
iso_send(STREAM s)
{
uint16 length;
s_pop_layer(s, iso_hdr);
length = s->end - s->p;
out_uint8(s, 3); /* version */
out_uint8(s, 0); /* reserved */
out_uint16_be(s, length);
out_uint8(s, 2); /* hdrlen */
out_uint8(s, ISO_PDU_DT); /* code */
out_uint8(s, 0x80); /* eot */
tcp_send(s);
}
/* Receive ISO transport data packet */
STREAM
iso_recv(void)
{
STREAM s;
uint8 code;
s = iso_recv_msg(&code);
if (s == NULL)
return NULL;
if (code != ISO_PDU_DT)
{
error("expected DT, got 0x%x\n", code);
return NULL;
}
return s;
}
/* Establish a connection up to the ISO layer */
BOOL
iso_connect(char *server)
{
uint8 code;
if (!tcp_connect(server))
return False;
iso_send_msg(ISO_PDU_CR);
if (iso_recv_msg(&code) == NULL)
{
return False;
}
if (code != ISO_PDU_CC)
{
error("expected CC, got 0x%x\n", code);
tcp_disconnect();
return False;
}
return True;
}
/* Disconnect from the ISO layer */
void
iso_disconnect(void)
{
iso_send_msg(ISO_PDU_DR);
tcp_disconnect();
}
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