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
|
/****************************************************************************
* examples/poll/net_listener.c
*
* Copyright (C) 2008 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>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <errno.h>
#include <debug.h>
#include <net/uip/uip-lib.h>
#include "poll_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
#define IOBUFFER_SIZE 80
/****************************************************************************
* Private Types
****************************************************************************/
struct net_listener_s
{
struct sockaddr_in addr;
fd_set master;
fd_set working;
char buffer[IOBUFFER_SIZE];
int listensd;
int mxsd;
};
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: net_closeclient
****************************************************************************/
static boolean net_closeclient(struct net_listener_s *nls, int sd)
{
message("net_listener: Closing host side connection sd=%d\n", sd);
close(sd);
FD_CLR(sd, &nls->master);
/* If we just closed the max SD, then search downward for the next biggest SD. */
while (FD_ISSET(nls->mxsd, &nls->master) == FALSE)
{
nls->mxsd -= 1;
}
return TRUE;
}
/****************************************************************************
* Name: net_incomingdata
****************************************************************************/
static inline boolean net_incomingdata(struct net_listener_s *nls, int sd)
{
char *ptr;
int nbytes;
int ret;
/* Read data from the socket */
#ifdef FIONBIO
for (;;)
#endif
{
message("net_listener: Read data from sd=%d\n", sd);
ret = recv(sd, nls->buffer, IOBUFFER_SIZE, 0);
if (ret < 0)
{
if (errno != EINTR)
{
message("net_listener: recv failed sd=%d: %d\n", sd, errno);
if (errno != EAGAIN)
{
net_closeclient(nls, sd);
return FALSE;
}
}
}
else if (ret == 0)
{
message("net_listener: Client connection lost sd=%d\n", sd);
net_closeclient(nls, sd);
return FALSE;
}
else
{
nls->buffer[ret]='\0';
message("poll_listener: Read '%s' (%d bytes)\n", nls->buffer, ret);
/* Echo the data back to the client */
for (nbytes = ret, ptr = nls->buffer; nbytes > 0; )
{
ret = send(sd, ptr, nbytes, 0);
if (ret < 0)
{
if (errno != EINTR)
{
message("net_listener: Send failed sd=%d: \n", sd, errno);
net_closeclient(nls, sd);
return FALSE;
}
}
else
{
nbytes -= ret;
ptr += ret;
}
}
}
}
}
/****************************************************************************
* Name: net_connection
****************************************************************************/
static inline boolean net_connection(struct net_listener_s *nls)
{
int sd;
/* Loop until all connections have been processed */
#ifdef FIONBIO
for (;;)
#endif
{
message("net_listener: Accepting accepting connection on sd=%d\n", nls->listensd);
sd = accept(nls->listensd, NULL, NULL);
if (sd < 0)
{
message("net_listener: accept failed: %d\n", sd);
if (errno != EINTR)
{
return FALSE;
}
}
else
{
/* Add the new connection to the master set */
FD_SET(sd, &nls->master);
if (sd > nls->mxsd)
{
nls->mxsd = sd;
}
return TRUE;
}
}
}
/****************************************************************************
* Name: net_mksocket
****************************************************************************/
static inline boolean net_mksocket(struct net_listener_s *nls)
{
int value;
int ret;
/* Create a listening socket */
message("net_listener: Initializing listener socket\n");
nls->listensd = socket(AF_INET, SOCK_STREAM, 0);
if (nls->listensd < 0)
{
message("net_listener: socket failed: %d\n", errno);
return FALSE;
}
/* Configure the socket */
value = 1;
ret = setsockopt(nls->listensd, SOL_SOCKET, SO_REUSEADDR, (char*)&value, sizeof(int));
if (ret < 0)
{
message("net_listener: setsockopt failed: %d\n", errno);
close(nls->listensd);
return FALSE;
}
/* Set the socket to non-blocking */
#ifdef FIONBIO
ret = ioctl(nls->listensd, FIONBIO, (char *)&value);
if (ret < 0)
{
message("net_listener: ioctl failed: %d\n", errno);
close(nls->listensd);
return FALSE;
}
#endif
/* Bind the socket */
memset(&nls->addr, 0, sizeof(struct sockaddr_in));
nls->addr.sin_family = AF_INET;
nls->addr.sin_addr.s_addr = htonl(INADDR_ANY);
nls->addr.sin_port = htons(LISTENER_PORT);
ret = bind(nls->listensd, (struct sockaddr *)&nls->addr, sizeof(struct sockaddr_in));
if (ret < 0)
{
message("net_listener: bind failed: %d\n", errno);
close(nls->listensd);
return FALSE;
}
/* Mark the socket as a listener */
ret = listen(nls->listensd, 32);
if (ret < 0)
{
message("net_listener: bind failed: %d\n", errno);
close(nls->listensd);
return FALSE;
}
return TRUE;
}
/****************************************************************************
* Name: net_configure
****************************************************************************/
static void net_configure(void)
{
struct in_addr addr;
#if defined(CONFIG_EXAMPLE_POLL_NOMAC)
ubyte mac[IFHWADDRLEN];
#endif
/* Configure uIP */
/* Many embedded network interfaces must have a software assigned MAC */
#ifdef CONFIG_EXAMPLE_POLL_NOMAC
mac[0] = 0x00;
mac[1] = 0xe0;
mac[2] = 0xb0;
mac[3] = 0x0b;
mac[4] = 0xba;
mac[5] = 0xbe;
uip_setmacaddr("eth0", mac);
#endif
/* Set up our host address */
addr.s_addr = HTONL(CONFIG_EXAMPLE_POLL_IPADDR);
uip_sethostaddr("eth0", &addr);
/* Set up the default router address */
addr.s_addr = HTONL(CONFIG_EXAMPLE_POLL_DRIPADDR);
uip_setdraddr("eth0", &addr);
/* Setup the subnet mask */
addr.s_addr = HTONL(CONFIG_EXAMPLE_POLL_NETMASK);
uip_setnetmask("eth0", &addr);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: net_listener
****************************************************************************/
void *net_listener(pthread_addr_t pvarg)
{
struct net_listener_s nls;
struct timeval timeout;
int nsds;
int ret;
int i;
/* Configure uIP */
net_configure();
/* Set up a listening socket */
memset(&nls, 0, sizeof(struct net_listener_s));
if (!net_mksocket(&nls))
{
return (void*)1;
}
/* Initialize the 'master' file descriptor set */
FD_ZERO(&nls.master);
nls.mxsd = nls.listensd;
FD_SET(nls.listensd, &nls.master);
/* Set up a 3 second timeout */
timeout.tv_sec = NET_LISTENER_DELAY;
timeout.tv_usec = 0;
/* Loop waiting for incoming connections or for incoming data
* on any of the connect sockets.
*/
for (;;)
{
/* Wait on select */
message("net_listener: Calling select(), listener sd=%d\n", nls.listensd);
memcpy(&nls.working, &nls.master, sizeof(fd_set));
ret = select(nls.mxsd + 1, &nls.working, NULL, NULL, &timeout);
if (ret < 0)
{
message("net_listener: select failed: %d\n", errno);
break;
}
/* Check for timeout */
if (ret == 0)
{
message("net_listener: Timeout\n");
continue;
}
/* Find which descriptors caused the wakeup */
nsds = ret;
for (i = 0; i <= nls.mxsd && nsds > 0; i++)
{
/* Is this descriptor ready? */
if (FD_ISSET(i, &nls.working))
{
/* Yes, is it our listener? */
message("net_listener: Activity on sd=%d\n", i);
nsds--;
if (i == nls.listensd)
{
(void)net_connection(&nls);
}
else
{
net_incomingdata(&nls, i);
}
}
}
}
/* Cleanup */
#if 0 /* Don't get here */
for (i = 0; i <= nls.mxsd; +i++)
{
if (FD_ISSET(i, &nls.master))
{
close(i);
}
}
#endif
return NULL; /* Keeps some compilers from complaining */
}
|