reactos/modules/rosapps/applications/net/tsclient/rdesktop/iso.c

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/* -*- c-basic-offset: 8 -*-
rdesktop: A Remote Desktop Protocol client.
Protocol services - ISO layer
Copyright (C) Matthew Chapman 1999-2005
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "rdesktop.h"
/* Send a self-contained ISO PDU */
static BOOL
iso_send_msg(RDPCLIENT * This, uint8 code)
{
STREAM s;
s = tcp_init(This, 11);
if(s == NULL)
return False;
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);
return tcp_send(This, s);
}
static BOOL
iso_send_connection_request(RDPCLIENT * This, char *cookie)
{
STREAM s;
int cookielen = (int)strlen(cookie);
int length = 11 + cookielen;
s = tcp_init(This, length);
if(s == NULL)
return False;
out_uint8(s, 3); /* version */
out_uint8(s, 0); /* reserved */
out_uint16_be(s, length); /* length */
out_uint8(s, length - 5); /* hdrlen */
out_uint8(s, ISO_PDU_CR);
out_uint16(s, 0); /* dst_ref */
out_uint16(s, 0); /* src_ref */
out_uint8(s, 0); /* class */
out_uint8p(s, cookie, cookielen);
s_mark_end(s);
return tcp_send(This, s);
}
/* Receive a message on the ISO layer, return code */
static STREAM
iso_recv_msg(RDPCLIENT * This, uint8 * code, uint8 * rdpver)
{
STREAM s;
uint16 length;
uint8 version;
s = tcp_recv(This, NULL, 4);
if (s == NULL)
return NULL;
in_uint8(s, version);
if (rdpver != NULL)
*rdpver = version;
if (version == 3)
{
in_uint8s(s, 1); /* pad */
in_uint16_be(s, length);
}
else
{
in_uint8(s, length);
if (length & 0x80)
{
length &= ~0x80;
next_be(s, length);
}
}
s = tcp_recv(This, s, length - 4);
if (s == NULL)
return NULL;
if (version != 3)
return s;
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(RDPCLIENT * This, int length)
{
STREAM s;
s = tcp_init(This, length + 7);
if(s == NULL)
return NULL;
s_push_layer(s, iso_hdr, 7);
return s;
}
/* Send an ISO data PDU */
BOOL
iso_send(RDPCLIENT * This, STREAM s)
{
uint16 length;
s_pop_layer(s, iso_hdr);
length = (uint16)(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 */
return tcp_send(This, s);
}
/* Receive ISO transport data packet */
STREAM
iso_recv(RDPCLIENT * This, uint8 * rdpver)
{
STREAM s;
uint8 code = 0;
s = iso_recv_msg(This, &code, rdpver);
if (s == NULL)
return NULL;
if (rdpver != NULL)
if (*rdpver != 3)
return s;
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(RDPCLIENT * This, char *server, char *cookie)
{
uint8 code = 0;
if (!tcp_connect(This, server))
return False;
if (!iso_send_connection_request(This, cookie))
return False;
if (iso_recv_msg(This, &code, NULL) == NULL)
return False;
if (code != ISO_PDU_CC)
{
error("expected CC, got 0x%x\n", code);
tcp_disconnect(This);
return False;
}
return True;
}
/* Establish a reconnection up to the ISO layer */
BOOL
iso_reconnect(RDPCLIENT * This, char *server, char *cookie)
{
uint8 code = 0;
if (!tcp_connect(This, server))
return False;
if (!iso_send_connection_request(This, cookie)) // BUGBUG should we really pass the cookie here?
return False;
if (iso_recv_msg(This, &code, NULL) == NULL)
return False;
if (code != ISO_PDU_CC)
{
error("expected CC, got 0x%x\n", code);
tcp_disconnect(This);
return False;
}
return True;
}
/* Disconnect from the ISO layer */
BOOL
iso_disconnect(RDPCLIENT * This)
{
iso_send_msg(This, ISO_PDU_DR);
return tcp_disconnect(This);
}
/* reset the state to support reconnecting */
void
iso_reset_state(RDPCLIENT * This)
{
tcp_reset_state(This);
}