1 |
/* |
2 |
rdesktop: A Remote Desktop Protocol client. |
3 |
Protocol services - ISO layer |
4 |
Copyright (C) Matthew Chapman 1999-2002 |
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 |
#include "rdesktop.h" |
22 |
|
23 |
/* Send a self-contained ISO PDU */ |
24 |
static void |
25 |
iso_send_msg(uint8 code) |
26 |
{ |
27 |
STREAM s; |
28 |
|
29 |
s = tcp_init(11); |
30 |
|
31 |
out_uint8(s, 3); /* version */ |
32 |
out_uint8(s, 0); /* reserved */ |
33 |
out_uint16_be(s, 11); /* length */ |
34 |
|
35 |
out_uint8(s, 6); /* hdrlen */ |
36 |
out_uint8(s, code); |
37 |
out_uint16(s, 0); /* dst_ref */ |
38 |
out_uint16(s, 0); /* src_ref */ |
39 |
out_uint8(s, 0); /* class */ |
40 |
|
41 |
s_mark_end(s); |
42 |
tcp_send(s); |
43 |
} |
44 |
|
45 |
/* Receive a message on the ISO layer, return code */ |
46 |
static STREAM |
47 |
iso_recv_msg(uint8 * code) |
48 |
{ |
49 |
STREAM s; |
50 |
uint16 length; |
51 |
uint8 version; |
52 |
|
53 |
s = tcp_recv(4); |
54 |
if (s == NULL) |
55 |
return NULL; |
56 |
|
57 |
in_uint8(s, version); |
58 |
if (version != 3) |
59 |
{ |
60 |
error("TPKT v%d\n", version); |
61 |
return NULL; |
62 |
} |
63 |
|
64 |
in_uint8s(s, 1); /* pad */ |
65 |
in_uint16_be(s, length); |
66 |
|
67 |
s = tcp_recv(length - 4); |
68 |
if (s == NULL) |
69 |
return NULL; |
70 |
|
71 |
in_uint8s(s, 1); /* hdrlen */ |
72 |
in_uint8(s, *code); |
73 |
|
74 |
if (*code == ISO_PDU_DT) |
75 |
{ |
76 |
in_uint8s(s, 1); /* eot */ |
77 |
return s; |
78 |
} |
79 |
|
80 |
in_uint8s(s, 5); /* dst_ref, src_ref, class */ |
81 |
return s; |
82 |
} |
83 |
|
84 |
/* Initialise ISO transport data packet */ |
85 |
STREAM |
86 |
iso_init(int length) |
87 |
{ |
88 |
STREAM s; |
89 |
|
90 |
s = tcp_init(length + 7); |
91 |
s_push_layer(s, iso_hdr, 7); |
92 |
|
93 |
return s; |
94 |
} |
95 |
|
96 |
/* Send an ISO data PDU */ |
97 |
void |
98 |
iso_send(STREAM s) |
99 |
{ |
100 |
uint16 length; |
101 |
|
102 |
s_pop_layer(s, iso_hdr); |
103 |
length = s->end - s->p; |
104 |
|
105 |
out_uint8(s, 3); /* version */ |
106 |
out_uint8(s, 0); /* reserved */ |
107 |
out_uint16_be(s, length); |
108 |
|
109 |
out_uint8(s, 2); /* hdrlen */ |
110 |
out_uint8(s, ISO_PDU_DT); /* code */ |
111 |
out_uint8(s, 0x80); /* eot */ |
112 |
|
113 |
tcp_send(s); |
114 |
} |
115 |
|
116 |
/* Receive ISO transport data packet */ |
117 |
STREAM |
118 |
iso_recv(void) |
119 |
{ |
120 |
STREAM s; |
121 |
uint8 code; |
122 |
|
123 |
s = iso_recv_msg(&code); |
124 |
if (s == NULL) |
125 |
return NULL; |
126 |
|
127 |
if (code != ISO_PDU_DT) |
128 |
{ |
129 |
error("expected DT, got 0x%x\n", code); |
130 |
return NULL; |
131 |
} |
132 |
|
133 |
return s; |
134 |
} |
135 |
|
136 |
/* Establish a connection up to the ISO layer */ |
137 |
BOOL |
138 |
iso_connect(char *server) |
139 |
{ |
140 |
uint8 code; |
141 |
|
142 |
if (!tcp_connect(server)) |
143 |
return False; |
144 |
|
145 |
iso_send_msg(ISO_PDU_CR); |
146 |
|
147 |
if (iso_recv_msg(&code) == NULL) |
148 |
return False; |
149 |
|
150 |
if (code != ISO_PDU_CC) |
151 |
{ |
152 |
error("expected CC, got 0x%x\n", code); |
153 |
tcp_disconnect(); |
154 |
return False; |
155 |
} |
156 |
|
157 |
return True; |
158 |
} |
159 |
|
160 |
/* Disconnect from the ISO layer */ |
161 |
void |
162 |
iso_disconnect(void) |
163 |
{ |
164 |
iso_send_msg(ISO_PDU_DR); |
165 |
tcp_disconnect(); |
166 |
} |