1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* probe_vnc.c
*
* Copyright (C) Brian de Alwis 2004
*
* This file is part of transcode, a video stream processing tool
*
* transcode 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, or (at your option)
* any later version.
*
* transcode 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 GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "transcode.h"
#include "tcinfo.h"
#include "ioaux.h"
#include "tc.h"
#include "libtc/libtc.h"
/* Some VNC constants */
#define VNCREC_MAGIC_STRING "vncLog0.0"
#define VNCREC_MAGIC_SIZE (9)
#define VNC_RFB_PROTOCOL_SCANF_FORMAT "RFB %03d.%03d\n"
#define VNC_RFB_PROTO_VERSION_SIZE (12)
#define VNC33_CHALLENGESIZE (16)
#define VNC33_rfbConnFailed (0)
#define VNC33_rfbNoAuth (1)
#define VNC33_rfbVncAuth (2)
#define VNC33_rfbVncAuthOK (0)
#define VNC33_rfbVncAuthFailed (1)
#define VNC33_rfbVncAuthTooMany (2)
/*
RFB 3.X protocol is as follows (from vncrec source code):
* server send 12-byte (SIZE_SIZE_RFB_PROTO_VERSION) header
encoding the RFB version as an ASCII string
* server sends 4-byte number (big-endian) to alert auth
requirements
* if requiring auth, server then sends 16-byte (VNC33_CHALLENGESIZE)
packet, which is to be encrypted and sent back (same size).
The server then sends 32-bit word result on pass-fail. Entire
thing aborted if not passed.
* client sends 1-byte message
* server then sends a display-paramters message, containing
(in order) the width (2-byte), height (2-byte), preferred pixel
format (1-byte), and desktop name (1-byte with length, n bytes).
*/
void probe_vnc(info_t *ipipe)
{
unsigned char buf[100];
unsigned char matchingBuffer[100];
int index = 0, major, minor, authReqs;
int width, height;
if(tc_pread(ipipe->fd_in, buf, sizeof(buf)) != sizeof(buf)) {
tc_log_error(__FILE__, "end of stream");
ipipe->error=1;
return;
}
/* Check VNCREC magic */
ac_memcpy(matchingBuffer, &buf[index], VNCREC_MAGIC_SIZE);
matchingBuffer[VNCREC_MAGIC_SIZE] = 0;
if(strcmp(matchingBuffer, VNCREC_MAGIC_STRING)) { /* NOT EQUAL */
tc_log_error(__FILE__, "unsupported version of vncrec (\"%s\")",
matchingBuffer);
ipipe->error=1;
return;
}
index += VNCREC_MAGIC_SIZE;
/* Ensure RFB protocol is valid */
ac_memcpy(matchingBuffer, &buf[index], VNC_RFB_PROTO_VERSION_SIZE);
matchingBuffer[VNC_RFB_PROTO_VERSION_SIZE] = 0;
if(sscanf(matchingBuffer, VNC_RFB_PROTOCOL_SCANF_FORMAT, &major, &minor) != 2) {
tc_log_error(__FILE__, "unknown RFB protocol (\"%s\")",
matchingBuffer);
ipipe->error=1;
return;
}
if (ipipe->verbose & TC_DEBUG) {
tc_log_msg(__FILE__, "File recorded as RFB Protocol v%d.%d",
major, minor);
}
if(major != 3) {
tc_log_error(__FILE__, "unsupported RFB protocol (only support v3)");
ipipe->error=1;
return;
}
index += VNC_RFB_PROTO_VERSION_SIZE;
/* Check authentication requirements */
authReqs = (buf[index] << 24) | (buf[index+1] << 16)
| (buf[index+2] << 8) | buf[index+3];
index += 4;
switch(authReqs) {
case VNC33_rfbNoAuth:
if (ipipe->verbose & TC_DEBUG)
tc_log_msg(__FILE__, "No authorization required.");
break;
case VNC33_rfbVncAuth: {
int authResp =
index += VNC33_CHALLENGESIZE;
authResp = (buf[index] << 24) | (buf[index+1] << 16)
| (buf[index+2] << 8) | buf[index+3];
/* switch(authResp) { ... } */
index += 4;
break;
}
case VNC33_rfbConnFailed:
default:
tc_log_error(__FILE__, "apparently connection failed?");
ipipe->error=1;
return;
}
/* Receive display parameters */
width = (buf[index] << 8) | buf[index+1];
height = (buf[index+2] << 8) | buf[index+3];
ipipe->probe_info->width = width;
ipipe->probe_info->height = height;
ipipe->probe_info->fps = 25.;
ipipe->probe_info->frc = 3;
ipipe->probe_info->codec = TC_CODEC_RGB;
ipipe->probe_info->magic = ipipe->magic;
}
|
