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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*
* Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
/*
* vncviewer.c - the Xt-based VNC viewer.
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <rfb/rfbclient.h>
static void Dummy(rfbClient* client) {
}
static Bool DummyPoint(rfbClient* client, int x, int y) {
return TRUE;
}
static void DummyRect(rfbClient* client, int x, int y, int w, int h) {
}
static char* NoPassword(rfbClient* client) {
return "";
}
static Bool MallocFrameBuffer(rfbClient* client) {
if(client->frameBuffer)
free(client->frameBuffer);
client->frameBuffer=malloc(client->width*client->height*client->format.bitsPerPixel/8);
return client->frameBuffer?TRUE:FALSE;
}
rfbClient* rfbGetClient(int* argc,char** argv,
int bitsPerSample,int samplesPerPixel,
int bytesPerPixel) {
rfbClient* client=(rfbClient*)calloc(sizeof(rfbClient),1);
client->programName = argv[0];
client->endianTest = 1;
client->format.bitsPerPixel = bytesPerPixel*8;
client->format.depth = bitsPerSample*samplesPerPixel;
client->format.bigEndian = *(char *)&client->endianTest?FALSE:TRUE;
client->format.trueColour = TRUE;
if (client->format.bitsPerPixel == 8) {
client->format.redMax = 7;
client->format.greenMax = 7;
client->format.blueMax = 3;
client->format.redShift = 0;
client->format.greenShift = 3;
client->format.blueShift = 6;
} else {
client->format.redMax = (1 << bitsPerSample) - 1;
client->format.greenMax = (1 << bitsPerSample) - 1;
client->format.blueMax = (1 << bitsPerSample) - 1;
if(!client->format.bigEndian) {
client->format.redShift = 0;
client->format.greenShift = bitsPerSample;
client->format.blueShift = bitsPerSample * 2;
} else {
if(client->format.bitsPerPixel==8*3) {
client->format.redShift = bitsPerSample*2;
client->format.greenShift = bitsPerSample*1;
client->format.blueShift = 0;
} else {
client->format.redShift = bitsPerSample*3;
client->format.greenShift = bitsPerSample*2;
client->format.blueShift = bitsPerSample;
}
}
}
client->HandleCursorPos = DummyPoint;
client->SoftCursorLockArea = DummyRect;
client->SoftCursorUnlockScreen = Dummy;
client->FramebufferUpdateReceived = DummyRect;
client->GetPassword = NoPassword;
client->MallocFrameBuffer = MallocFrameBuffer;
client->Bell = Dummy;
return client;
}
void PrintRect(rfbClient* client, int x, int y, int w, int h) {
fprintf(stderr,"Received an update for %d,%d,%d,%d.\n",x,y,w,h);
}
void SaveFramebufferAsPGM(rfbClient* client, int x, int y, int w, int h) {
static time_t t=0,t1;
FILE* f;
int i,j;
int bpp=client->format.bitsPerPixel/8;
int row_stride=client->width*bpp;
/* save one picture only if the last is older than 2 seconds */
t1=time(0);
if(t1-t>2)
t=t1;
else
return;
/* assert bpp=4 */
if(bpp!=4) {
fprintf(stderr,"bpp = %d (!=4)\n",bpp);
return;
}
f=fopen("/tmp/framebuffer.ppm","wb");
fprintf(f,"P6\n# %s\n%d %d\n255\n",client->desktopName,client->width,client->height);
for(j=0;j<client->height*row_stride;j+=row_stride)
for(i=0;i<client->width*bpp;i+=bpp) {
if(client->format.bigEndian) {
fputc(client->frameBuffer[j+i+bpp-1],f);
fputc(client->frameBuffer[j+i+bpp-2],f);
fputc(client->frameBuffer[j+i+bpp-3],f);
} else {
fputc(client->frameBuffer[j+i+bpp+0],f);
fputc(client->frameBuffer[j+i+bpp+1],f);
fputc(client->frameBuffer[j+i+bpp+2],f);
}
}
fclose(f);
}
void
vncEncryptBytes(unsigned char *bytes, char *passwd);
int
main(int argc, char **argv)
{
int i;
rfbClient* client = rfbGetClient(&argc,argv,8,3,4);
const char* vncServerHost="";
int vncServerPort=5900;
char buf1[]="pass",buf2[]="pass";
vncEncryptBytes(buf1,buf2);
client->FramebufferUpdateReceived = PrintRect;
client->FramebufferUpdateReceived = SaveFramebufferAsPGM;
/* The -listen option is used to make us a daemon process which listens for
incoming connections from servers, rather than actively connecting to a
given server. The -tunnel and -via options are useful to create
connections tunneled via SSH port forwarding. We must test for the
-listen option before invoking any Xt functions - this is because we use
forking, and Xt doesn't seem to cope with forking very well. For -listen
option, when a successful incoming connection has been accepted,
listenForIncomingConnections() returns, setting the listenSpecified
flag. */
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-listen") == 0) {
listenForIncomingConnections(client);
break;
} else {
char* colon=strchr(argv[i],':');
vncServerHost=argv[i];
if(colon) {
*colon=0;
vncServerPort=atoi(colon+1);
} else
vncServerPort=0;
vncServerPort+=5900;
}
/* TODO:
if (strcmp(argv[i], "-tunnel") == 0 || strcmp(argv[i], "-via") == 0) {
if (!createTunnel(&argc, argv, i))
exit(1);
break;
}
*/
}
/* Call the main Xt initialisation function. It parses command-line options,
generating appropriate resource specs, and makes a connection to the X
display. */
/* TODO: cmdline args
toplevel = XtVaAppInitialize(&appContext, "Vncviewer",
cmdLineOptions, numCmdLineOptions,
&argc, argv, fallback_resources,
XtNborderWidth, 0, NULL);
dpy = XtDisplay(toplevel);
*/
/* Interpret resource specs and process any remaining command-line arguments
(i.e. the VNC server name). If the server name isn't specified on the
command line, getArgsAndResources() will pop up a dialog box and wait
for one to be entered. */
/*
GetArgsAndResources(argc, argv);
*/
/* Unless we accepted an incoming connection, make a TCP connection to the
given VNC server */
if (!client->listenSpecified) {
if (!ConnectToRFBServer(client,vncServerHost, vncServerPort)) exit(1);
}
/* Initialise the VNC connection, including reading the password */
if (!InitialiseRFBConnection(client)) exit(1);
SetFormatAndEncodings(client);
client->width=client->si.framebufferWidth;
client->height=client->si.framebufferHeight;
client->MallocFrameBuffer(client);
SendFramebufferUpdateRequest(client,0,0,client->width,client->height,FALSE);
/* Now enter the main loop, processing VNC messages. X events will
automatically be processed whenever the VNC connection is idle. */
while (1) {
if (!HandleRFBServerMessage(client))
break;
}
return 0;
}
|
