trunk/rdesktop/iso.c

/* -*- c-basic-offset: 8 -*-
   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);
}

static void
iso_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 STREAM
iso_recv_msg(uint8 * code)
{
        STREAM s;
        uint16 length;
        uint8 version;
        BOOL shortform = False; // Shut the compiler up.

      next_packet:
        s = tcp_recv(4);
        if (s == NULL)
                return NULL;

        in_uint8(s, version);
        switch (version & 3)
        {
                case 0:
                        in_uint8(s, length);
                        if (length & 0x80)
                        {
                                length &= ~0x80;
                                next_be(s, length);
                                shortform = False;
                        }
                        else
                        {
                                shortform = True;
                        }
                        break;

                case 3:
                        in_uint8s(s, 1);        /* pad */
                        in_uint16_be(s, length);
                        break;

                default:
                        error("TPKT v%d\n", version);
                        return NULL;
        }

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

        if ((version & 3) == 0)
        {
                rdp5_process(s, version & 0x80, shortform);
                goto next_packet;
        }

        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, char *username)
{
        uint8 code;

        if (!tcp_connect(server))
                return False;

        iso_send_connection_request(username);

        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();
}
1	forsberg	347	/* -- c-basic-offset: 8 --
2	matty	3	rdesktop: A Remote Desktop Protocol client.
3			Protocol services - ISO layer
4	matthewc	207	Copyright (C) Matthew Chapman 1999-2002
5	matty	3
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	forsberg	347	static void
46			iso_send_connection_request(char *username)
47			{
48			STREAM s;
49			int length = 30 + strlen(username);
50
51			s = tcp_init(length);
52
53			out_uint8(s, 3); /* version */
54			out_uint8(s, 0); /* reserved */
55			out_uint16_be(s, length); /* length */
56
57			out_uint8(s, length - 5); /* hdrlen */
58			out_uint8(s, ISO_PDU_CR);
59			out_uint16(s, 0); /* dst_ref */
60			out_uint16(s, 0); /* src_ref */
61			out_uint8(s, 0); /* class */
62
63			out_uint8p(s, "Cookie: mstshash=", strlen("Cookie: mstshash="));
64			out_uint8p(s, username, strlen(username));
65
66			out_uint8(s, 0x0d); /* Unknown */
67			out_uint8(s, 0x0a); /* Unknown */
68
69			s_mark_end(s);
70			tcp_send(s);
71			}
72
73	matty	10	/* Receive a message on the ISO layer, return code */
74	matty	25	static STREAM
75	astrand	64	iso_recv_msg(uint8 * code)
76	matty	10	{
77			STREAM s;
78			uint16 length;
79			uint8 version;
80	forsberg	347	BOOL shortform = False; // Shut the compiler up.
81	matty	10
82	forsberg	347	next_packet:
83	matty	10	s = tcp_recv(4);
84			if (s == NULL)
85	matty	33	return NULL;
86	matty	10
87			in_uint8(s, version);
88	forsberg	347	switch (version & 3)
89	matty	3	{
90	forsberg	347	case 0:
91			in_uint8(s, length);
92			if (length & 0x80)
93			{
94			length &= ~0x80;
95			next_be(s, length);
96			shortform = False;
97			}
98			else
99			{
100			shortform = True;
101			}
102			break;
103
104			case 3:
105			in_uint8s(s, 1); /* pad */
106			in_uint16_be(s, length);
107			break;
108
109			default:
110			error("TPKT v%d\n", version);
111			return NULL;
112	matty	3	}
113
114	matty	10	s = tcp_recv(length - 4);
115			if (s == NULL)
116	matty	33	return NULL;
117	matty	10
118	forsberg	347	if ((version & 3) == 0)
119			{
120			rdp5_process(s, version & 0x80, shortform);
121			goto next_packet;
122			}
123
124	matty	24	in_uint8s(s, 1); /* hdrlen */
125	matty	10	in_uint8(s, *code);
126
127			if (*code == ISO_PDU_DT)
128			{
129	matty	24	in_uint8s(s, 1); /* eot */
130			return s;
131	matty	10	}
132
133	matty	24	in_uint8s(s, 5); /* dst_ref, src_ref, class */
134	matty	10	return s;
135	matty	3	}
136
137	matty	10	/* Initialise ISO transport data packet */
138	matty	25	STREAM
139			iso_init(int length)
140	matty	3	{
141	matty	10	STREAM s;
142	matty	3
143	matty	10	s = tcp_init(length + 7);
144			s_push_layer(s, iso_hdr, 7);
145
146			return s;
147	matty	3	}
148
149	matty	10	/* Send an ISO data PDU */
150	matty	25	void
151			iso_send(STREAM s)
152	matty	3	{
153	matty	10	uint16 length;
154	matty	3
155	matty	10	s_pop_layer(s, iso_hdr);
156			length = s->end - s->p;
157	matty	3
158	matty	24	out_uint8(s, 3); /* version */
159			out_uint8(s, 0); /* reserved */
160	matty	10	out_uint16_be(s, length);
161	matty	3
162	matty	24	out_uint8(s, 2); /* hdrlen */
163			out_uint8(s, ISO_PDU_DT); /* code */
164			out_uint8(s, 0x80); /* eot */
165	matty	10
166			tcp_send(s);
167	matty	3	}
168
169			/* Receive ISO transport data packet */
170	matty	25	STREAM
171	matthewc	192	iso_recv(void)
172	matty	3	{
173	matty	10	STREAM s;
174	matty	3	uint8 code;
175
176	matty	10	s = iso_recv_msg(&code);
177	matty	33	if (s == NULL)
178			return NULL;
179
180			if (code != ISO_PDU_DT)
181	matty	3	{
182	matty	33	error("expected DT, got 0x%x\n", code);
183			return NULL;
184	matty	3	}
185
186	matty	10	return s;
187	matty	3	}
188
189	matty	10	/* Establish a connection up to the ISO layer */
190	matty	25	BOOL
191	forsberg	347	iso_connect(char server, char username)
192	matty	3	{
193	matty	10	uint8 code;
194	matty	3
195	matty	10	if (!tcp_connect(server))
196			return False;
197	matty	3
198	forsberg	347	iso_send_connection_request(username);
199	matty	3
200	matty	33	if (iso_recv_msg(&code) == NULL)
201			return False;
202
203			if (code != ISO_PDU_CC)
204	matty	3	{
205	matty	33	error("expected CC, got 0x%x\n", code);
206	matty	10	tcp_disconnect();
207	matty	3	return False;
208			}
209
210			return True;
211			}
212
213	matty	10	/* Disconnect from the ISO layer */
214	matty	25	void
215	matthewc	192	iso_disconnect(void)
216	matty	3	{
217	matty	10	iso_send_msg(ISO_PDU_DR);
218			tcp_disconnect();
219	matty	3	}