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
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
|
/****************************************************************************
* net/recvfrom.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifdef CONFIG_NET
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <nuttx/clock.h>
#include <net/uip/uip-arch.h>
#include "net-internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
#define TCP_TIMEO 10 /* Deciseconds after data received before recv() returns */
/****************************************************************************
* Private Types
****************************************************************************/
struct recvfrom_s
{
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
FAR struct socket *rf_sock; /* The parent socket structure */
uint32 rf_starttime; /* rcv start time for determining timeout */
#endif
sem_t rf_sem; /* Semaphore signals recv completion */
size_t rf_buflen; /* Length of receive buffer */
char *rf_buffer; /* Pointer to receive buffer */
size_t rf_recvlen; /* The received length */
int rf_result; /* OK on success, otherwise a negated errno. */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: recvfrom_interrupt
*
* Description:
* This function is called from the interrupt level to perform the actual
* receive operation via by the uIP layer.
*
* Parameters:
* dev The sructure of the network driver that caused the interrupt
* private An instance of struct recvfrom_s cast to void*
*
* Returned Value:
* None
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static void recvfrom_interrupt(struct uip_driver_s *dev, void *private)
{
struct recvfrom_s *pstate = (struct recvfrom_s *)private;
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
FAR struct socket *psock;
#endif
size_t recvlen;
vdbg("Interrupt uip_flags: %02x\n", uip_flags);
/* 'private' might be null in some race conditions (?) */
if (pstate)
{
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
/* Get the socket reference from the private data */
psock = pstate->rf_sock;
#endif
/* If new data is available, then complete the read action. */
if (uip_newdata_event())
{
/* Get the length of the data to return */
if (dev->d_len > pstate->rf_buflen)
{
recvlen = pstate->rf_buflen;
}
else
{
recvlen = dev->d_len;
}
/* Copy the new appdata into the user buffer */
memcpy(pstate->rf_buffer, dev->d_appdata, recvlen);
vdbg("Received %d bytes (of %d)\n", recvlen, dev->d_len);
/* Update the accumulated size of the data read */
pstate->rf_recvlen += recvlen;
pstate->rf_buffer += recvlen;
pstate->rf_buflen -= recvlen;
/* Are we finished? If this is a UDP socket or if the user
* buffer has been filled, then we are finished.
*/
#ifdef CONFIG_NET_UDP
if (psock->s_type == SOCK_DGRAM)
{
struct uip_udp_conn *udp_conn;
vdbg("UDP complete\n");
/* Don't allow any further UDP call backs. */
udp_conn = (struct uip_udp_conn *)psock->s_conn;
udp_conn->private = NULL;
udp_conn->event = NULL;
/* Wake up the waiting thread, returning the number of bytes
* actually read.
*/
sem_post(&pstate->rf_sem);
}
else
#endif
if (pstate->rf_buflen == 0)
{
struct uip_conn *conn;
vdbg("TCP complete\n");
/* The TCP receive buffer is full. Return now, perhaps truncating
* the received data (need to fix that).
*
* Don't allow any further TCP call backs.
*/
conn = (struct uip_conn *)psock->s_conn;
conn->data_private = NULL;
conn->data_event = NULL;
/* Wake up the waiting thread, returning the number of bytes
* actually read.
*/
sem_post(&pstate->rf_sem);
}
/* Reset the timeout. We will want a short timeout to terminate
* the TCP receive.
*/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
pstate->rf_starttime = g_system_timer;
#endif
}
/* Check for a loss of connection */
else if ((uip_flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
{
vdbg("Receive error\n");
/* Stop further callbacks */
#ifdef CONFIG_NET_UDP
if (psock->s_type == SOCK_DGRAM)
{
struct uip_udp_conn *udp_conn = (struct uip_udp_conn *)psock->s_conn;
udp_conn->private = NULL;
udp_conn->event = NULL;
}
else
#endif
{
struct uip_conn *conn = (struct uip_conn *)psock->s_conn;
conn->data_private = NULL;
conn->data_event = NULL;
}
/* Report not connected */
pstate->rf_result = -ENOTCONN;
/* Wake up the waiting thread */
sem_post(&pstate->rf_sem);
}
/* No data has been received -- this is some other event... probably a
* poll -- check for a timeout.
*/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
else
{
socktimeo_t timeo;
/* If this is a TCP socket that has already received some data,
* than we will always use a short timeout.
*/
if (pstate->rf_recvlen > 0)
{
/* Use the short timeout */
timeo = TCP_TIMEO;
}
/* No.. check for a timeout configured via setsockopts(SO_RCVTIMEO).
* If none... we well let the read hang forever.
*/
else
{
timeo = psock->s_rcvtimeo;
}
/* Is there an effective timeout? */
if (timeo)
{
/* Yes.. Check if the timeout has elapsed */
if (net_timeo(pstate->rf_starttime, timeo))
{
/* Yes.. the timeout has elapsed... do not allow any further
* callbacks
*/
#ifdef CONFIG_NET_UDP
if (psock->s_type == SOCK_DGRAM)
{
struct uip_udp_conn *udp_conn;
vdbg("UDP timeout\n");
/* Stop further callbacks */
udp_conn = (struct uip_udp_conn *)psock->s_conn;
udp_conn->private = NULL;
udp_conn->event = NULL;
/* Report a timeout error */
pstate->rf_result = -EAGAIN;
}
else
#endif
{
struct uip_conn *conn;
vdbg("TCP timeout\n");
conn = (struct uip_conn *)psock->s_conn;
conn->data_private = NULL;
conn->data_event = NULL;
/* Report an error only if no data has been received */
if (pstate->rf_recvlen == 0)
{
/* Report the timeout error */
pstate->rf_result = -EAGAIN;
}
}
/* Wake up the waiting thread, returning either the error -EAGAIN
* that signals the timeout event or the data received up to
* the point tht the timeout occured (no error).
*/
sem_post(&pstate->rf_sem);
}
}
}
#endif
}
}
/****************************************************************************
* Function: recvfrom_init
*
* Description:
* Initialize the state structure
*
* Parameters:
* psock Pointer to the socket structure for the socket
* buf Buffer to receive data
* len Length of buffer
* pstate A pointer to the state structure to be initialized
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void recvfrom_init(FAR struct socket *psock, FAR void *buf, size_t len,
struct recvfrom_s *pstate)
{
/* Initialize the state structure. */
memset(pstate, 0, sizeof(struct recvfrom_s));
(void)sem_init(&pstate->rf_sem, 0, 0); /* Doesn't really fail */
pstate->rf_buflen = len;
pstate->rf_buffer = buf;
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
/* Set up the start time for the timeout */
pstate->rf_sock = psock;
pstate->rf_starttime = g_system_timer;
#endif
}
/****************************************************************************
* Function: recvfrom_result
*
* Description:
* Evaluate the result of the recv operations
*
* Parameters:
* result The result of the sem_wait operation (may indicate EINTR)
* pstate A pointer to the state structure to be initialized
*
* Returned Value:
* The result of the recv operation with errno set appropriately
*
* Assumptions:
*
****************************************************************************/
static ssize_t recvfrom_result(int result, struct recvfrom_s *pstate)
{
int save_errno = *get_errno_ptr(); /* In case something we do changes it */
/* Release semaphore in the state structure */
sem_destroy(&pstate->rf_sem);
/* Check for a error/timeout detected by the interrupt handler. Errors are
* signaled by negative errno values for the rcv length
*/
if (pstate->rf_result < 0)
{
/* Return EGAIN on a timeout or ENOTCONN on loss of connection */
return pstate->rf_result;
}
/* If sem_wait failed, then we were probably reawakened by a signal. In
* this case, sem_wait will have set errno appropriately.
*/
if (result < 0)
{
return -save_errno;
}
return pstate->rf_recvlen;
}
/****************************************************************************
* Function: udp_recvfrom
*
* Description:
* Perform the recvfrom operation for a UDP SOCK_DGRAM
*
* Parameters:
* psock Pointer to the socket structure for the SOCK_DRAM socket
* buf Buffer to receive data
* len Length of buffer
* infrom INET ddress of source (may be NULL)
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -errno is returned (see recvfrom for list of errnos).
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_UDP
#ifdef CONFIG_NET_IPv6
static ssize_t udp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
FAR const struct sockaddr_in6 *infrom )
#else
static ssize_t udp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
FAR const struct sockaddr_in *infrom )
#endif
{
struct uip_udp_conn *udp_conn;
struct recvfrom_s state;
irqstate_t save;
int ret;
/* Perform the UDP recvfrom() operation */
/* Initialize the state structure. This is done with interrupts
* disabled because we don't want anything to happen until we
* are ready.
*/
save = irqsave();
recvfrom_init(psock, buf, len, &state);
/* Setup the UDP socket */
ret = uip_udpconnect(psock->s_conn, NULL);
if (ret < 0)
{
irqrestore(save);
return ret;
}
/* Set up the callback in the connection */
udp_conn = (struct uip_udp_conn *)psock->s_conn;
udp_conn->private = (void*)&state;
udp_conn->event = recvfrom_interrupt;
/* Enable the UDP socket */
uip_udpenable(psock->s_conn);
/* Wait for either the receive to complete or for an error/timeout to occur.
* NOTES: (1) sem_wait will also terminate if a signal is received, (2)
* interrupts are disabled! They will be re-enabled while the task sleeps
* and automatically re-enabled when the task restarts.
*/
vdbg("Receiving UDP ...\n");
ret = sem_wait(&state. rf_sem);
vdbg("Received\n");
/* Make sure that no further interrupts are processed */
uip_udpdisable(psock->s_conn);
udp_conn->private = NULL;
udp_conn->event = NULL;
irqrestore(save);
#warning "Needs to return server address"
return recvfrom_result(ret, &state);
}
#endif /* CONFIG_NET_UDP */
/****************************************************************************
* Function: tcp_recvfrom
*
* Description:
* Perform the recvfrom operation for a TCP/IP SOCK_STREAM
*
* Parameters:
* psock Pointer to the socket structure for the SOCK_DRAM socket
* buf Buffer to receive data
* len Length of buffer
* infrom INET ddress of source (may be NULL)
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -errno is returned (see recvfrom for list of errnos).
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
static ssize_t tcp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
FAR const struct sockaddr_in6 *infrom )
#else
static ssize_t tcp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
FAR const struct sockaddr_in *infrom )
#endif
{
struct uip_conn *conn;
struct recvfrom_s state;
irqstate_t save;
int ret;
/* Verify that the SOCK_STREAM has been connected */
if (_SS_ISCONNECTED(psock->s_flags))
{
/* The SOCK_STREAM must be connected in order to receive */
return -ENOTCONN;
}
/* Initialize the state structure. This is done with interrupts
* disabled because we don't want anything to happen until we
* are ready.
*/
save = irqsave();
recvfrom_init(psock, buf, len, &state);
/* Set up the callback in the connection */
conn = (struct uip_conn *)psock->s_conn;
conn->data_private = (void*)&state;
conn->data_event = recvfrom_interrupt;
/* Wait for either the receive to complete or for an error/timeout to occur.
* NOTES: (1) sem_wait will also terminate if a signal is received, (2)
* interrupts are disabled! They will be re-enabled while the task sleeps
* and automatically re-enabled when the task restarts.
*/
vdbg("Receiving UDP ...\n");
ret = sem_wait(&state.rf_sem);
vdbg("Received\n");
/* Make sure that no further interrupts are processed */
conn->data_private = NULL;
conn->data_event = NULL;
irqrestore(save);
#warning "Needs to return server address"
return recvfrom_result(ret, &state);
}
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Function: recvfrom
*
* Description:
* recvfrom() receives messages from a socket, and may be used to receive
* data on a socket whether or not it is connection-oriented.
*
* If from is not NULL, and the underlying protocol provides the source
* address, this source address is filled in. The argument fromlen
* initialized to the size of the buffer associated with from, and modified
* on return to indicate the actual size of the address stored there.
*
* Parameters:
* sockfd Socket descriptor of socket
* buf Buffer to receive data
* len Length of buffer
* flags Receive flags
* from Address of source (may be NULL)
* fromlen The length of the address structure
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -1 is returned, and errno is set appropriately:
*
* EAGAIN
* The socket is marked non-blocking and the receive operation would block,
* or a receive timeout had been set and the timeout expired before data
* was received.
* EBADF
* The argument sockfd is an invalid descriptor.
* ECONNREFUSED
* A remote host refused to allow the network connection (typically because
* it is not running the requested service).
* EFAULT
* The receive buffer pointer(s) point outside the process's address space.
* EINTR
* The receive was interrupted by delivery of a signal before any data were
* available.
* EINVAL
* Invalid argument passed.
* ENOMEM
* Could not allocate memory.
* ENOTCONN
* The socket is associated with a connection-oriented protocol and has
* not been connected.
* ENOTSOCK
* The argument sockfd does not refer to a socket.
*
* Assumptions:
*
****************************************************************************/
ssize_t recvfrom(int sockfd, FAR void *buf, size_t len, int flags, FAR struct sockaddr *from,
FAR socklen_t *fromlen)
{
FAR struct socket *psock;
#ifdef CONFIG_NET_IPv6
FAR const struct sockaddr_in6 *infrom = (const struct sockaddr_in6 *)from;
#else
FAR const struct sockaddr_in *infrom = (const struct sockaddr_in *)from;
#endif
ssize_t ret;
int err;
/* Verify that non-NULL pointers were passed */
if (!buf)
{
err = EINVAL;
goto errout;
}
/* Get the underlying socket structure */
/* Verify that the sockfd corresponds to valid, allocated socket */
psock = sockfd_socket(sockfd);
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* If a 'from' address has been provided, verify that it is valid */
if (from)
{
#ifdef CONFIG_NET_IPv6
if (from->sa_family != AF_INET6 || *fromlen < sizeof(struct sockaddr_in6))
#else
if (from->sa_family != AF_INET || *fromlen < sizeof(struct sockaddr_in))
#endif
{
err = EBADF;
goto errout;
}
}
/* Set the socket state to receiving */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_RECV);
/* Perform the TCP/IP or UDP recv() operation */
#ifdef CONFIG_NET_UDP
if (psock->s_type == SOCK_STREAM)
#endif
{
ret = tcp_recvfrom(psock, buf, len, infrom);
}
#ifdef CONFIG_NET_UDP
else
{
ret = udp_recvfrom(psock, buf, len, infrom);
}
#endif
/* Set the socket state to idle */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
/* Handle returned errors */
if (ret < 0)
{
err = -ret;
goto errout;
}
/* Success return */
return ret;
errout:
*get_errno_ptr() = err;
return ERROR;
}
#endif /* CONFIG_NET */
|