/* -*- 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., 675 Mass Ave, Cambridge, MA 02139, USA.*/#include "rdesktop.h"/* Send a self-contained ISO PDU */static voidiso_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);}static voidiso_send_connection_request(char *username){	STREAM s;	int length = 30 + strlen(username);	s = tcp_init(length);	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: mstshash=", strlen("Cookie: mstshash="));	out_uint8p(s, username, strlen(username));	out_uint8(s, 0x0d);	/* Unknown */	out_uint8(s, 0x0a);	/* Unknown */	s_mark_end(s);	tcp_send(s);}/* Receive a message on the ISO layer, return code */static STREAMiso_recv_msg(uint8 * code, uint8 * rdpver){	STREAM s;	uint16 length;	uint8 version;	s = tcp_recv(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(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 */STREAMiso_init(int length){	STREAM s;	s = tcp_init(length + 7);	s_push_layer(s, iso_hdr, 7);	return s;}/* Send an ISO data PDU */voidiso_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 */STREAMiso_recv(uint8 * rdpver){	STREAM s;	uint8 code = 0;	s = iso_recv_msg(&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 */BOOLiso_connect(char *server, char *username){	uint8 code = 0;	if (!tcp_connect(server))		return False;	iso_send_connection_request(username);	if (iso_recv_msg(&code, NULL) == 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 */voidiso_disconnect(void){	iso_send_msg(ISO_PDU_DR);	tcp_disconnect();}