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  • Committer: Package Import Robot
  • Author(s): Michael Terry
  • Date: 2013-04-30 09:50:37 UTC
  • mfrom: (1.1.8) (9.1.6 sid)
  • Revision ID: package-import@ubuntu.com-20130430095037-8w2e4kro8jywahrm
Tags: 1.0.2-1ubuntu1
* Merge from Debian unstable.  Remaining changes:
  - debian/{control,rules}: Drop avcodec/ffmpeg support
* debian/patches/remote-control.diff,
  debian/patches/cherry-48ad5feb0a6ad831d863f89ed74b443021e54303.patch,
  debian/patches/backport-from-stdin.patch,
  debian/patches/allow-null-domain.patch:
  - Dropped, included upstream

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.pc/1.0-stable-sync.patch/libfreerdp-core/transport.c
1
 
/**
2
 
 * FreeRDP: A Remote Desktop Protocol Client
3
 
 * Network Transport Layer
4
 
 *
5
 
 * Copyright 2011 Vic Lee
6
 
 *
7
 
 * Licensed under the Apache License, Version 2.0 (the "License");
8
 
 * you may not use this file except in compliance with the License.
9
 
 * You may obtain a copy of the License at
10
 
 *
11
 
 *     http://www.apache.org/licenses/LICENSE-2.0
12
 
 *
13
 
 * Unless required by applicable law or agreed to in writing, software
14
 
 * distributed under the License is distributed on an "AS IS" BASIS,
15
 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16
 
 * See the License for the specific language governing permissions and
17
 
 * limitations under the License.
18
 
 */
19
 
 
20
 
#include "config.h"
21
 
#include <stdio.h>
22
 
#include <stdlib.h>
23
 
#include <string.h>
24
 
#include <freerdp/utils/sleep.h>
25
 
#include <freerdp/utils/stream.h>
26
 
#include <freerdp/utils/memory.h>
27
 
#include <freerdp/utils/hexdump.h>
28
 
 
29
 
#include <time.h>
30
 
#include <errno.h>
31
 
#include <fcntl.h>
32
 
 
33
 
#ifndef _WIN32
34
 
#include <netdb.h>
35
 
#include <sys/socket.h>
36
 
#endif
37
 
 
38
 
#include "tpkt.h"
39
 
#include "fastpath.h"
40
 
#include "credssp.h"
41
 
#include "transport.h"
42
 
 
43
 
#define BUFFER_SIZE 16384
44
 
 
45
 
STREAM* transport_recv_stream_init(rdpTransport* transport, int size)
46
 
{
47
 
        STREAM* s = transport->recv_stream;
48
 
        stream_check_size(s, size);
49
 
        stream_set_pos(s, 0);
50
 
        return s;
51
 
}
52
 
 
53
 
STREAM* transport_send_stream_init(rdpTransport* transport, int size)
54
 
{
55
 
        STREAM* s = transport->send_stream;
56
 
        stream_check_size(s, size);
57
 
        stream_set_pos(s, 0);
58
 
        return s;
59
 
}
60
 
 
61
 
boolean transport_connect(rdpTransport* transport, const char* hostname, uint16 port)
62
 
{
63
 
        return tcp_connect(transport->tcp, hostname, port);
64
 
}
65
 
 
66
 
void transport_attach(rdpTransport* transport, int sockfd)
67
 
{
68
 
        transport->tcp->sockfd = sockfd;
69
 
}
70
 
 
71
 
boolean transport_disconnect(rdpTransport* transport)
72
 
{
73
 
        if (transport->layer == TRANSPORT_LAYER_TLS)
74
 
                tls_disconnect(transport->tls);
75
 
        return tcp_disconnect(transport->tcp);
76
 
}
77
 
 
78
 
boolean transport_connect_rdp(rdpTransport* transport)
79
 
{
80
 
        /* RDP encryption */
81
 
 
82
 
        return true;
83
 
}
84
 
 
85
 
boolean transport_connect_tls(rdpTransport* transport)
86
 
{
87
 
        if (transport->tls == NULL)
88
 
                transport->tls = tls_new(transport->settings);
89
 
 
90
 
        transport->layer = TRANSPORT_LAYER_TLS;
91
 
        transport->tls->sockfd = transport->tcp->sockfd;
92
 
 
93
 
        if (tls_connect(transport->tls) != true)
94
 
                return false;
95
 
 
96
 
        return true;
97
 
}
98
 
 
99
 
boolean transport_connect_nla(rdpTransport* transport)
100
 
{
101
 
        if (transport->tls == NULL)
102
 
                transport->tls = tls_new(transport->settings);
103
 
 
104
 
        transport->layer = TRANSPORT_LAYER_TLS;
105
 
        transport->tls->sockfd = transport->tcp->sockfd;
106
 
 
107
 
        if (tls_connect(transport->tls) != true)
108
 
                return false;
109
 
 
110
 
        /* Network Level Authentication */
111
 
 
112
 
        if (transport->settings->authentication != true)
113
 
                return true;
114
 
 
115
 
        if (transport->credssp == NULL)
116
 
                transport->credssp = credssp_new(transport);
117
 
 
118
 
        if (credssp_authenticate(transport->credssp) < 0)
119
 
        {
120
 
                printf("Authentication failure, check credentials.\n"
121
 
                        "If credentials are valid, the NTLMSSP implementation may be to blame.\n");
122
 
 
123
 
                credssp_free(transport->credssp);
124
 
                return false;
125
 
        }
126
 
 
127
 
        credssp_free(transport->credssp);
128
 
 
129
 
        return true;
130
 
}
131
 
 
132
 
boolean transport_accept_rdp(rdpTransport* transport)
133
 
{
134
 
        /* RDP encryption */
135
 
 
136
 
        return true;
137
 
}
138
 
 
139
 
boolean transport_accept_tls(rdpTransport* transport)
140
 
{
141
 
        if (transport->tls == NULL)
142
 
                transport->tls = tls_new(transport->settings);
143
 
 
144
 
        transport->layer = TRANSPORT_LAYER_TLS;
145
 
        transport->tls->sockfd = transport->tcp->sockfd;
146
 
 
147
 
        if (tls_accept(transport->tls, transport->settings->cert_file, transport->settings->privatekey_file) != true)
148
 
                return false;
149
 
 
150
 
        return true;
151
 
}
152
 
 
153
 
boolean transport_accept_nla(rdpTransport* transport)
154
 
{
155
 
        if (transport->tls == NULL)
156
 
                transport->tls = tls_new(transport->settings);
157
 
 
158
 
        transport->layer = TRANSPORT_LAYER_TLS;
159
 
        transport->tls->sockfd = transport->tcp->sockfd;
160
 
 
161
 
        if (tls_accept(transport->tls, transport->settings->cert_file, transport->settings->privatekey_file) != true)
162
 
                return false;
163
 
 
164
 
        /* Network Level Authentication */
165
 
 
166
 
        if (transport->settings->authentication != true)
167
 
                return true;
168
 
 
169
 
        /* Blocking here until NLA is complete */
170
 
 
171
 
        return true;
172
 
}
173
 
 
174
 
int transport_read(rdpTransport* transport, STREAM* s)
175
 
{
176
 
        int status = -1;
177
 
 
178
 
        while (true)
179
 
        {
180
 
                if (transport->layer == TRANSPORT_LAYER_TLS)
181
 
                        status = tls_read(transport->tls, stream_get_tail(s), stream_get_left(s));
182
 
                else if (transport->layer == TRANSPORT_LAYER_TCP)
183
 
                        status = tcp_read(transport->tcp, stream_get_tail(s), stream_get_left(s));
184
 
 
185
 
                if (status == 0 && transport->blocking)
186
 
                {
187
 
                        freerdp_usleep(transport->usleep_interval);
188
 
                        continue;
189
 
                }
190
 
 
191
 
                break;
192
 
        }
193
 
 
194
 
#ifdef WITH_DEBUG_TRANSPORT
195
 
        if (status > 0)
196
 
        {
197
 
                printf("Local < Remote\n");
198
 
                freerdp_hexdump(s->data, status);
199
 
        }
200
 
#endif
201
 
 
202
 
        return status;
203
 
}
204
 
 
205
 
static int transport_read_nonblocking(rdpTransport* transport)
206
 
{
207
 
        int status;
208
 
 
209
 
        stream_check_size(transport->recv_buffer, 4096);
210
 
        status = transport_read(transport, transport->recv_buffer);
211
 
 
212
 
        if (status <= 0)
213
 
                return status;
214
 
 
215
 
        stream_seek(transport->recv_buffer, status);
216
 
 
217
 
        return status;
218
 
}
219
 
 
220
 
int transport_write(rdpTransport* transport, STREAM* s)
221
 
{
222
 
        int status = -1;
223
 
        int length;
224
 
 
225
 
        length = stream_get_length(s);
226
 
        stream_set_pos(s, 0);
227
 
 
228
 
#ifdef WITH_DEBUG_TRANSPORT
229
 
        if (length > 0)
230
 
        {
231
 
                printf("Local > Remote\n");
232
 
                freerdp_hexdump(s->data, length);
233
 
        }
234
 
#endif
235
 
 
236
 
        while (length > 0)
237
 
        {
238
 
                if (transport->layer == TRANSPORT_LAYER_TLS)
239
 
                        status = tls_write(transport->tls, stream_get_tail(s), length);
240
 
                else if (transport->layer == TRANSPORT_LAYER_TCP)
241
 
                        status = tcp_write(transport->tcp, stream_get_tail(s), length);
242
 
 
243
 
                if (status < 0)
244
 
                        break; /* error occurred */
245
 
 
246
 
                if (status == 0)
247
 
                {
248
 
                        /* blocking while sending */
249
 
                        freerdp_usleep(transport->usleep_interval);
250
 
 
251
 
                        /* when sending is blocked in nonblocking mode, the receiving buffer should be checked */
252
 
                        if (!transport->blocking)
253
 
                        {
254
 
                                /* and in case we do have buffered some data, we set the event so next loop will get it */
255
 
                                if (transport_read_nonblocking(transport) > 0)
256
 
                                        wait_obj_set(transport->recv_event);
257
 
                        }
258
 
                }
259
 
 
260
 
                length -= status;
261
 
                stream_seek(s, status);
262
 
        }
263
 
 
264
 
        if (status < 0)
265
 
        {
266
 
                /* A write error indicates that the peer has dropped the connection */
267
 
                transport->layer = TRANSPORT_LAYER_CLOSED;
268
 
        }
269
 
 
270
 
        return status;
271
 
}
272
 
 
273
 
void transport_get_fds(rdpTransport* transport, void** rfds, int* rcount)
274
 
{
275
 
        rfds[*rcount] = (void*)(long)(transport->tcp->sockfd);
276
 
        (*rcount)++;
277
 
        wait_obj_get_fds(transport->recv_event, rfds, rcount);
278
 
}
279
 
 
280
 
int transport_check_fds(rdpTransport* transport)
281
 
{
282
 
        int pos;
283
 
        int status;
284
 
        uint16 length;
285
 
        STREAM* received;
286
 
 
287
 
        wait_obj_clear(transport->recv_event);
288
 
 
289
 
        status = transport_read_nonblocking(transport);
290
 
 
291
 
        if (status < 0)
292
 
                return status;
293
 
 
294
 
        while ((pos = stream_get_pos(transport->recv_buffer)) > 0)
295
 
        {
296
 
                stream_set_pos(transport->recv_buffer, 0);
297
 
                if (tpkt_verify_header(transport->recv_buffer)) /* TPKT */
298
 
                {
299
 
                        /* Ensure the TPKT header is available. */
300
 
                        if (pos <= 4)
301
 
                        {
302
 
                                stream_set_pos(transport->recv_buffer, pos);
303
 
                                return 0;
304
 
                        }
305
 
                        length = tpkt_read_header(transport->recv_buffer);
306
 
                }
307
 
                else /* Fast Path */
308
 
                {
309
 
                        /* Ensure the Fast Path header is available. */
310
 
                        if (pos <= 2)
311
 
                        {
312
 
                                stream_set_pos(transport->recv_buffer, pos);
313
 
                                return 0;
314
 
                        }
315
 
                        /* Fastpath header can be two or three bytes long. */
316
 
                        length = fastpath_header_length(transport->recv_buffer);
317
 
                        if (pos < length)
318
 
                        {
319
 
                                stream_set_pos(transport->recv_buffer, pos);
320
 
                                return 0;
321
 
                        }
322
 
                        length = fastpath_read_header(NULL, transport->recv_buffer);
323
 
                }
324
 
 
325
 
                if (length == 0)
326
 
                {
327
 
                        printf("transport_check_fds: protocol error, not a TPKT or Fast Path header.\n");
328
 
                        freerdp_hexdump(stream_get_head(transport->recv_buffer), pos);
329
 
                        return -1;
330
 
                }
331
 
 
332
 
                if (pos < length)
333
 
                {
334
 
                        stream_set_pos(transport->recv_buffer, pos);
335
 
                        return 0; /* Packet is not yet completely received. */
336
 
                }
337
 
 
338
 
                /*
339
 
                 * A complete packet has been received. In case there are trailing data
340
 
                 * for the next packet, we copy it to the new receive buffer.
341
 
                 */
342
 
                received = transport->recv_buffer;
343
 
                transport->recv_buffer = stream_new(BUFFER_SIZE);
344
 
 
345
 
                if (pos > length)
346
 
                {
347
 
                        stream_set_pos(received, length);
348
 
                        stream_check_size(transport->recv_buffer, pos - length);
349
 
                        stream_copy(transport->recv_buffer, received, pos - length);
350
 
                }
351
 
 
352
 
                stream_set_pos(received, length);
353
 
                stream_seal(received);
354
 
                stream_set_pos(received, 0);
355
 
                
356
 
                if (transport->recv_callback(transport, received, transport->recv_extra) == false)
357
 
                        status = -1;
358
 
        
359
 
                stream_free(received);
360
 
 
361
 
                if (status < 0)
362
 
                        return status;
363
 
        }
364
 
 
365
 
        return 0;
366
 
}
367
 
 
368
 
boolean transport_set_blocking_mode(rdpTransport* transport, boolean blocking)
369
 
{
370
 
        transport->blocking = blocking;
371
 
        return tcp_set_blocking_mode(transport->tcp, blocking);
372
 
}
373
 
 
374
 
rdpTransport* transport_new(rdpSettings* settings)
375
 
{
376
 
        rdpTransport* transport;
377
 
 
378
 
        transport = (rdpTransport*) xzalloc(sizeof(rdpTransport));
379
 
 
380
 
        if (transport != NULL)
381
 
        {
382
 
                transport->tcp = tcp_new(settings);
383
 
                transport->settings = settings;
384
 
 
385
 
                /* a small 0.1ms delay when transport is blocking. */
386
 
                transport->usleep_interval = 100;
387
 
 
388
 
                /* receive buffer for non-blocking read. */
389
 
                transport->recv_buffer = stream_new(BUFFER_SIZE);
390
 
                transport->recv_event = wait_obj_new();
391
 
 
392
 
                /* buffers for blocking read/write */
393
 
                transport->recv_stream = stream_new(BUFFER_SIZE);
394
 
                transport->send_stream = stream_new(BUFFER_SIZE);
395
 
 
396
 
                transport->blocking = true;
397
 
 
398
 
                transport->layer = TRANSPORT_LAYER_TCP;
399
 
        }
400
 
 
401
 
        return transport;
402
 
}
403
 
 
404
 
void transport_free(rdpTransport* transport)
405
 
{
406
 
        if (transport != NULL)
407
 
        {
408
 
                stream_free(transport->recv_buffer);
409
 
                stream_free(transport->recv_stream);
410
 
                stream_free(transport->send_stream);
411
 
                wait_obj_free(transport->recv_event);
412
 
                if (transport->tls)
413
 
                        tls_free(transport->tls);
414
 
                tcp_free(transport->tcp);
415
 
                xfree(transport);
416
 
        }
417
 
}