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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
|
/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Thomas Goddard 2012
* Copyright (C) Jay Sorg 2012
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* do not use os_calls in here */
#define LOG_LEVEL 1
#define LLOG(_level, _args) \
do { if (_level < LOG_LEVEL) { ErrorF _args ; } } while (0)
#define LLOGLN(_level, _args) \
do { if (_level < LOG_LEVEL) { printf _args ; printf("\n"); } } while (0)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "xrdpapi.h"
struct wts_obj
{
int fd;
int status;
char name[8];
char dname[128];
int display_num;
int flags;
};
/*****************************************************************************/
static int
get_display_num_from_display(char *display_text)
{
int index;
int mode;
int host_index;
int disp_index;
int scre_index;
char host[256];
char disp[256];
char scre[256];
index = 0;
host_index = 0;
disp_index = 0;
scre_index = 0;
mode = 0;
while (display_text[index] != 0)
{
if (display_text[index] == ':')
{
mode = 1;
}
else if (display_text[index] == '.')
{
mode = 2;
}
else if (mode == 0)
{
host[host_index] = display_text[index];
host_index++;
}
else if (mode == 1)
{
disp[disp_index] = display_text[index];
disp_index++;
}
else if (mode == 2)
{
scre[scre_index] = display_text[index];
scre_index++;
}
index++;
}
host[host_index] = 0;
disp[disp_index] = 0;
scre[scre_index] = 0;
return atoi(disp);
}
/*****************************************************************************/
void *
WTSVirtualChannelOpen(void *hServer, unsigned int SessionId,
const char *pVirtualName)
{
if (hServer != WTS_CURRENT_SERVER_HANDLE)
{
return 0;
}
return WTSVirtualChannelOpenEx(SessionId, pVirtualName, 0);
}
/*****************************************************************************/
static int
can_send(int sck, int millis)
{
struct timeval time;
fd_set wfds;
int select_rv;
FD_ZERO(&wfds);
FD_SET(sck, &wfds);
time.tv_sec = millis / 1000;
time.tv_usec = (millis * 1000) % 1000000;
select_rv = select(sck + 1, 0, &wfds, 0, &time);
if (select_rv > 0)
{
return 1;
}
return 0;
}
/*****************************************************************************/
static int
can_recv(int sck, int millis)
{
struct timeval time;
fd_set rfds;
int select_rv;
FD_ZERO(&rfds);
FD_SET(sck, &rfds);
time.tv_sec = millis / 1000;
time.tv_usec = (millis * 1000) % 1000000;
select_rv = select(sck + 1, &rfds, 0, 0, &time);
if (select_rv > 0)
{
return 1;
}
return 0;
}
/*****************************************************************************/
static int
send_init(struct wts_obj *wts)
{
char initmsg[64];
memset(initmsg, 0, 64);
strncpy(initmsg, wts->name, 8);
initmsg[16] = (wts->flags >> 0) & 0xff;
initmsg[17] = (wts->flags >> 8) & 0xff;
initmsg[18] = (wts->flags >> 16) & 0xff;
initmsg[19] = (wts->flags >> 24) & 0xff;
LLOGLN(10, ("send_init: sending %s", initmsg));
if (!can_send(wts->fd, 500))
{
return 1;
}
if (send(wts->fd, initmsg, 64, 0) != 64)
{
return 1;
}
LLOGLN(10, ("send_init: send ok!"));
return 0;
}
/*****************************************************************************/
void *
WTSVirtualChannelOpenEx(unsigned int SessionId,
const char *pVirtualName,
unsigned int flags)
{
struct wts_obj *wts;
char *display_text;
struct sockaddr_un s;
int bytes;
unsigned long llong;
if (SessionId != WTS_CURRENT_SESSION)
{
LLOGLN(0, ("WTSVirtualChannelOpenEx: SessionId bad"));
return 0;
}
wts = (struct wts_obj *)malloc(sizeof(struct wts_obj));
memset(wts, 0, sizeof(struct wts_obj));
wts->fd = -1;
wts->flags = flags;
display_text = getenv("DISPLAY");
if (display_text != 0)
{
wts->display_num = get_display_num_from_display(display_text);
}
if (wts->display_num > 0)
{
wts->fd = socket(AF_UNIX, SOCK_STREAM, 0);
/* set non blocking */
llong = fcntl(wts->fd, F_GETFL);
llong = llong | O_NONBLOCK;
fcntl(wts->fd, F_SETFL, llong);
/* connect to session chansrv */
memset(&s, 0, sizeof(struct sockaddr_un));
s.sun_family = AF_UNIX;
bytes = sizeof(s.sun_path);
snprintf(s.sun_path, bytes - 1, "/tmp/.xrdp/xrdpapi_%d", wts->display_num);
s.sun_path[bytes - 1] = 0;
bytes = sizeof(struct sockaddr_un);
if (connect(wts->fd, (struct sockaddr *)&s, bytes) == 0)
{
LLOGLN(10, ("WTSVirtualChannelOpenEx: connected ok, name %s", pVirtualName));
strncpy(wts->name, pVirtualName, 8);
/* wait for connection to complete and send init */
if (send_init(wts) == 0)
{
/* all ok */
wts->status = 1;
}
}
}
else
{
LLOGLN(0, ("WTSVirtualChannelOpenEx: display is 0"));
}
return wts;
}
/*****************************************************************************/
int
WTSVirtualChannelWrite(void *hChannelHandle, const char *Buffer,
unsigned int Length, unsigned int *pBytesWritten)
{
struct wts_obj *wts;
int error;
int lerrno;
wts = (struct wts_obj *)hChannelHandle;
if (wts == 0)
{
return 0;
}
if (wts->status != 1)
{
return 0;
}
if (can_send(wts->fd, 0))
{
error = send(wts->fd, Buffer, Length, 0);
if (error == -1)
{
lerrno = errno;
if ((lerrno == EWOULDBLOCK) || (lerrno == EAGAIN) ||
(lerrno == EINPROGRESS))
{
*pBytesWritten = 0;
return 1;
}
return 0;
}
else if (error == 0)
{
return 0;
}
else if (error > 0)
{
*pBytesWritten = error;
return 1;
}
}
*pBytesWritten = 0;
return 1;
}
/*****************************************************************************/
int
WTSVirtualChannelRead(void *hChannelHandle, unsigned int TimeOut,
char *Buffer, unsigned int BufferSize,
unsigned int *pBytesRead)
{
struct wts_obj *wts;
int error;
int lerrno;
wts = (struct wts_obj *)hChannelHandle;
if (wts == 0)
{
return 0;
}
if (wts->status != 1)
{
return 0;
}
if (can_recv(wts->fd, TimeOut))
{
error = recv(wts->fd, Buffer, BufferSize, 0);
if (error == -1)
{
lerrno = errno;
if ((lerrno == EWOULDBLOCK) || (lerrno == EAGAIN) ||
(lerrno == EINPROGRESS))
{
*pBytesRead = 0;
return 1;
}
return 0;
}
else if (error == 0)
{
return 0;
}
else if (error > 0)
{
*pBytesRead = error;
return 1;
}
}
*pBytesRead = 0;
return 1;
}
/*****************************************************************************/
int
WTSVirtualChannelClose(void *hChannelHandle)
{
struct wts_obj *wts;
wts = (struct wts_obj *)hChannelHandle;
if (wts == 0)
{
return 0;
}
if (wts->fd != -1)
{
close(wts->fd);
}
free(wts);
return 1;
}
/*****************************************************************************/
int
WTSVirtualChannelQuery(void *hChannelHandle, WTS_VIRTUAL_CLASS WtsVirtualClass,
void **ppBuffer, unsigned int *pBytesReturned)
{
struct wts_obj *wts;
wts = (struct wts_obj *)hChannelHandle;
if (wts == 0)
{
return 0;
}
if (wts->status != 1)
{
return 0;
}
if (WtsVirtualClass == WTSVirtualFileHandle)
{
*pBytesReturned = 4;
*ppBuffer = malloc(4);
memcpy(*ppBuffer, &(wts->fd), 4);
}
return 1;
}
/*****************************************************************************/
void
WTSFreeMemory(void *pMemory)
{
if (pMemory != 0)
{
free(pMemory);
}
}
|