rdesktop/trunk/iso.c

/*
   rdesktop: A Remote Desktop Protocol client.
   Protocol services - ISO layer
   Copyright (C) Matthew Chapman 1999-2000
   
   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 False;

        in_uint8(s, version);
        if (version != 3)
        {
                ERROR("TPKT v%d\n", version);
                return False;
        }

        in_uint8s(s, 1);        /* pad */
        in_uint16_be(s, length);

        s = tcp_recv(length - 4);
        if (s == NULL)
                return False;

        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()
{
        STREAM s;
        uint8 code;

        s = iso_recv_msg(&code);
        if ((s == NULL) || (code != ISO_PDU_DT))
        {
                ERROR("expected DT, got %d\n", code);
                return False;
        }

        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) || (code != ISO_PDU_CC))
        {
                ERROR("expected CC, got %d\n", code);
                tcp_disconnect();
                return False;
        }

        return True;
}

/* Disconnect from the ISO layer */
void
iso_disconnect()
{
        iso_send_msg(ISO_PDU_DR);
        tcp_disconnect();
}
1	matty	3	/*
2			rdesktop: A Remote Desktop Protocol client.
3			Protocol services - ISO layer
4			Copyright (C) Matthew Chapman 1999-2000
5
6			This program is free software; you can redistribute it and/or modify
7			it under the terms of the GNU General Public License as published by
8			the Free Software Foundation; either version 2 of the License, or
9			(at your option) any later version.
10
11			This program is distributed in the hope that it will be useful,
12			but WITHOUT ANY WARRANTY; without even the implied warranty of
13			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			GNU General Public License for more details.
15
16			You should have received a copy of the GNU General Public License
17			along with this program; if not, write to the Free Software
18			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19			*/
20
21	matty	10	#include "rdesktop.h"
22	matty	3
23	matty	10	/* Send a self-contained ISO PDU */
24	matty	25	static void
25			iso_send_msg(uint8 code)
26	matty	3	{
27	matty	10	STREAM s;
28	matty	3
29	matty	10	s = tcp_init(11);
30	matty	3
31	matty	24	out_uint8(s, 3); /* version */
32			out_uint8(s, 0); /* reserved */
33			out_uint16_be(s, 11); /* length */
34	matty	3
35	matty	24	out_uint8(s, 6); /* hdrlen */
36	matty	10	out_uint8(s, code);
37	matty	24	out_uint16(s, 0); /* dst_ref */
38			out_uint16(s, 0); /* src_ref */
39			out_uint8(s, 0); /* class */
40	matty	10
41			s_mark_end(s);
42			tcp_send(s);
43			}
44
45			/* Receive a message on the ISO layer, return code */
46	matty	25	static STREAM
47			iso_recv_msg(uint8 *code)
48	matty	10	{
49			STREAM s;
50			uint16 length;
51			uint8 version;
52
53			s = tcp_recv(4);
54			if (s == NULL)
55			return False;
56
57			in_uint8(s, version);
58			if (version != 3)
59	matty	3	{
60	matty	10	ERROR("TPKT v%d\n", version);
61			return False;
62	matty	3	}
63
64	matty	24	in_uint8s(s, 1); /* pad */
65	matty	10	in_uint16_be(s, length);
66	matty	3
67	matty	10	s = tcp_recv(length - 4);
68			if (s == NULL)
69			return False;
70
71	matty	24	in_uint8s(s, 1); /* hdrlen */
72	matty	10	in_uint8(s, *code);
73
74			if (*code == ISO_PDU_DT)
75			{
76	matty	24	in_uint8s(s, 1); /* eot */
77			return s;
78	matty	10	}
79
80	matty	24	in_uint8s(s, 5); /* dst_ref, src_ref, class */
81	matty	10	return s;
82	matty	3	}
83
84	matty	10	/* Initialise ISO transport data packet */
85	matty	25	STREAM
86			iso_init(int length)
87	matty	3	{
88	matty	10	STREAM s;
89	matty	3
90	matty	10	s = tcp_init(length + 7);
91			s_push_layer(s, iso_hdr, 7);
92
93			return s;
94	matty	3	}
95
96	matty	10	/* Send an ISO data PDU */
97	matty	25	void
98			iso_send(STREAM s)
99	matty	3	{
100	matty	10	uint16 length;
101	matty	3
102	matty	10	s_pop_layer(s, iso_hdr);
103			length = s->end - s->p;
104	matty	3
105	matty	24	out_uint8(s, 3); /* version */
106			out_uint8(s, 0); /* reserved */
107	matty	10	out_uint16_be(s, length);
108	matty	3
109	matty	24	out_uint8(s, 2); /* hdrlen */
110			out_uint8(s, ISO_PDU_DT); /* code */
111			out_uint8(s, 0x80); /* eot */
112	matty	10
113			tcp_send(s);
114	matty	3	}
115
116			/* Receive ISO transport data packet */
117	matty	25	STREAM
118			iso_recv()
119	matty	3	{
120	matty	10	STREAM s;
121	matty	3	uint8 code;
122
123	matty	10	s = iso_recv_msg(&code);
124			if ((s == NULL) \|\| (code != ISO_PDU_DT))
125	matty	3	{
126	matty	10	ERROR("expected DT, got %d\n", code);
127	matty	3	return False;
128			}
129
130	matty	10	return s;
131	matty	3	}
132
133	matty	10	/* Establish a connection up to the ISO layer */
134	matty	25	BOOL
135			iso_connect(char *server)
136	matty	3	{
137	matty	10	uint8 code;
138	matty	3
139	matty	10	if (!tcp_connect(server))
140			return False;
141	matty	3
142	matty	10	iso_send_msg(ISO_PDU_CR);
143	matty	3
144	matty	10	if ((iso_recv_msg(&code) == NULL) \|\| (code != ISO_PDU_CC))
145	matty	3	{
146	matty	10	ERROR("expected CC, got %d\n", code);
147			tcp_disconnect();
148	matty	3	return False;
149			}
150
151			return True;
152			}
153
154	matty	10	/* Disconnect from the ISO layer */
155	matty	25	void
156			iso_disconnect()
157	matty	3	{
158	matty	10	iso_send_msg(ISO_PDU_DR);
159			tcp_disconnect();
160	matty	3	}