trunk/rdesktop/iso.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Protocol services - ISO layer
   Copyright (C) Matthew Chapman 1999-2007

   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, 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);
                }
        }
        if (length < 4)
        {
                error("Bad packet header\n");
                return NULL;
        }
        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 */
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(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 */
RD_BOOL
iso_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;
}

/* Establish a reconnection up to the ISO layer */
RD_BOOL
iso_reconnect(char *server)
{
        uint8 code = 0;

        if (!tcp_connect(server))
                return False;

        iso_send_msg(ISO_PDU_CR);

        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 */
void
iso_disconnect(void)
{
        iso_send_msg(ISO_PDU_DR);
        tcp_disconnect();
}

/* reset the state to support reconnecting */
void
iso_reset_state(void)
{
        tcp_reset_state();
}
1	forsberg	347	/* -- c-basic-offset: 8 --
2	matty	3	rdesktop: A Remote Desktop Protocol client.
3			Protocol services - ISO layer
4	jsorg71	1365	Copyright (C) Matthew Chapman 1999-2007
5
6	matty	3	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	jsorg71	1365
11	matty	3	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	jsorg71	1365
16	matty	3	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	jsorg71	733	iso_recv_msg(uint8 * code, uint8 * rdpver)
76	matty	10	{
77			STREAM s;
78			uint16 length;
79			uint8 version;
80
81	matthewc	423	s = tcp_recv(NULL, 4);
82	matty	10	if (s == NULL)
83	matty	33	return NULL;
84	matty	10	in_uint8(s, version);
85	jsorg71	733	if (rdpver != NULL)
86			*rdpver = version;
87			if (version == 3)
88	matty	3	{
89	jsorg71	733	in_uint8s(s, 1); /* pad */
90			in_uint16_be(s, length);
91	matty	3	}
92	jsorg71	733	else
93			{
94			in_uint8(s, length);
95			if (length & 0x80)
96			{
97			length &= ~0x80;
98			next_be(s, length);
99			}
100			}
101	matthewc	1434	if (length < 4)
102			{
103			error("Bad packet header\n");
104			return NULL;
105			}
106	matthewc	423	s = tcp_recv(s, length - 4);
107	matty	10	if (s == NULL)
108	matty	33	return NULL;
109	jsorg71	733	if (version != 3)
110			return s;
111	matty	24	in_uint8s(s, 1); /* hdrlen */
112	matty	10	in_uint8(s, *code);
113			if (*code == ISO_PDU_DT)
114			{
115	matty	24	in_uint8s(s, 1); /* eot */
116			return s;
117	matty	10	}
118	matty	24	in_uint8s(s, 5); /* dst_ref, src_ref, class */
119	matty	10	return s;
120	matty	3	}
121
122	matty	10	/* Initialise ISO transport data packet */
123	matty	25	STREAM
124			iso_init(int length)
125	matty	3	{
126	matty	10	STREAM s;
127	matty	3
128	matty	10	s = tcp_init(length + 7);
129			s_push_layer(s, iso_hdr, 7);
130
131			return s;
132	matty	3	}
133
134	matty	10	/* Send an ISO data PDU */
135	matty	25	void
136			iso_send(STREAM s)
137	matty	3	{
138	matty	10	uint16 length;
139	matty	3
140	matty	10	s_pop_layer(s, iso_hdr);
141			length = s->end - s->p;
142	matty	3
143	matty	24	out_uint8(s, 3); /* version */
144			out_uint8(s, 0); /* reserved */
145	matty	10	out_uint16_be(s, length);
146	matty	3
147	matty	24	out_uint8(s, 2); /* hdrlen */
148			out_uint8(s, ISO_PDU_DT); /* code */
149			out_uint8(s, 0x80); /* eot */
150	matty	10
151			tcp_send(s);
152	matty	3	}
153
154			/* Receive ISO transport data packet */
155	matty	25	STREAM
156	jsorg71	733	iso_recv(uint8 * rdpver)
157	matty	3	{
158	matty	10	STREAM s;
159	jsorg71	733	uint8 code = 0;
160	matty	3
161	jsorg71	733	s = iso_recv_msg(&code, rdpver);
162	matty	33	if (s == NULL)
163			return NULL;
164	jsorg71	733	if (rdpver != NULL)
165			if (*rdpver != 3)
166			return s;
167	matty	33	if (code != ISO_PDU_DT)
168	matty	3	{
169	matty	33	error("expected DT, got 0x%x\n", code);
170			return NULL;
171	matty	3	}
172	matty	10	return s;
173	matty	3	}
174
175	matty	10	/* Establish a connection up to the ISO layer */
176	jsorg71	1372	RD_BOOL
177	forsberg	347	iso_connect(char server, char username)
178	matty	3	{
179	jsorg71	733	uint8 code = 0;
180	matty	3
181	matty	10	if (!tcp_connect(server))
182			return False;
183	matty	3
184	forsberg	347	iso_send_connection_request(username);
185	matty	3
186	jsorg71	733	if (iso_recv_msg(&code, NULL) == NULL)
187	matty	33	return False;
188
189			if (code != ISO_PDU_CC)
190	matty	3	{
191	matty	33	error("expected CC, got 0x%x\n", code);
192	matty	10	tcp_disconnect();
193	matty	3	return False;
194			}
195
196			return True;
197			}
198
199	astrand	977	/* Establish a reconnection up to the ISO layer */
200	jsorg71	1372	RD_BOOL
201	astrand	977	iso_reconnect(char *server)
202			{
203			uint8 code = 0;
204
205			if (!tcp_connect(server))
206			return False;
207
208			iso_send_msg(ISO_PDU_CR);
209
210			if (iso_recv_msg(&code, NULL) == NULL)
211			return False;
212
213			if (code != ISO_PDU_CC)
214			{
215			error("expected CC, got 0x%x\n", code);
216			tcp_disconnect();
217			return False;
218			}
219
220			return True;
221			}
222
223	matty	10	/* Disconnect from the ISO layer */
224	matty	25	void
225	matthewc	192	iso_disconnect(void)
226	matty	3	{
227	matty	10	iso_send_msg(ISO_PDU_DR);
228			tcp_disconnect();
229	matty	3	}
230	astrand	977
231			/* reset the state to support reconnecting */
232			void
233			iso_reset_state(void)
234			{
235			tcp_reset_state();
236			}