0
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9 #include <ngx_event.h>
|
|
10 #include <nginx.h>
|
|
11
|
|
12
|
|
13 typedef struct {
|
|
14 int flag;
|
|
15 u_char *name;
|
|
16 } ngx_accept_log_ctx_t;
|
|
17
|
|
18
|
|
19 static void ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log);
|
|
20 static size_t ngx_accept_log_error(void *data, char *buf, size_t len);
|
|
21
|
|
22
|
|
23 void ngx_event_accept(ngx_event_t *ev)
|
|
24 {
|
|
25 ngx_uint_t instance, accepted;
|
|
26 socklen_t len;
|
|
27 struct sockaddr *sa;
|
|
28 ngx_err_t err;
|
|
29 ngx_log_t *log;
|
|
30 ngx_pool_t *pool;
|
|
31 ngx_socket_t s;
|
|
32 ngx_event_t *rev, *wev;
|
|
33 ngx_connection_t *c, *ls;
|
|
34 ngx_event_conf_t *ecf;
|
|
35 ngx_accept_log_ctx_t *ctx;
|
|
36
|
|
37 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
|
|
38
|
|
39 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
|
|
40 ev->available = 1;
|
|
41
|
|
42 } else if (!(ngx_event_flags & NGX_HAVE_KQUEUE_EVENT)) {
|
|
43 ev->available = ecf->multi_accept;
|
|
44 }
|
|
45
|
|
46 ls = ev->data;
|
|
47
|
|
48 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
49 "accept on %s, ready: %d",
|
|
50 ls->listening->addr_text.data, ev->available);
|
|
51
|
|
52 ev->ready = 0;
|
|
53 accepted = 0;
|
|
54 pool = NULL;
|
|
55
|
|
56 do {
|
|
57
|
|
58 if (pool == NULL) {
|
|
59
|
|
60 /*
|
|
61 * Create the pool before accept() to avoid the copying of
|
|
62 * the sockaddr. Although accept() can fail it is uncommon
|
|
63 * case and besides the pool can be got from the free pool list
|
|
64 */
|
|
65
|
|
66 if (!(pool = ngx_create_pool(ls->listening->pool_size, ev->log))) {
|
|
67 return;
|
|
68 }
|
|
69 }
|
|
70
|
|
71 if (!(sa = ngx_palloc(pool, ls->listening->socklen))) {
|
|
72 ngx_destroy_pool(pool);
|
|
73 return;
|
|
74 }
|
|
75
|
|
76 if (!(log = ngx_palloc(pool, sizeof(ngx_log_t)))) {
|
|
77 ngx_destroy_pool(pool);
|
|
78 return;
|
|
79 }
|
|
80
|
|
81 ngx_memcpy(log, ls->log, sizeof(ngx_log_t));
|
|
82 pool->log = log;
|
|
83
|
|
84 if (!(ctx = ngx_palloc(pool, sizeof(ngx_accept_log_ctx_t)))) {
|
|
85 ngx_destroy_pool(pool);
|
|
86 return;
|
|
87 }
|
|
88
|
|
89 /* -1 disables the connection number logging */
|
|
90 ctx->flag = -1;
|
|
91 ctx->name = ls->listening->addr_text.data;
|
|
92
|
|
93 log->data = ctx;
|
|
94 log->handler = ngx_accept_log_error;
|
|
95
|
|
96 len = ls->listening->socklen;
|
|
97
|
|
98 s = accept(ls->fd, sa, &len);
|
|
99 if (s == -1) {
|
|
100 err = ngx_socket_errno;
|
|
101
|
|
102 if (err == NGX_EAGAIN) {
|
|
103 #if 0
|
|
104 if (!(ngx_event_flags & NGX_USE_RTSIG_EVENT))
|
|
105 {
|
|
106 ngx_log_error(NGX_LOG_NOTICE, log, err,
|
|
107 "EAGAIN after %d accepted connection(s)",
|
|
108 accepted);
|
|
109 }
|
|
110 #endif
|
|
111
|
|
112 ngx_destroy_pool(pool);
|
|
113 return;
|
|
114 }
|
|
115
|
|
116 ngx_log_error(NGX_LOG_ALERT, ev->log, err,
|
|
117 "accept() on %s failed",
|
|
118 ls->listening->addr_text.data);
|
|
119
|
|
120 if (err == NGX_ECONNABORTED) {
|
|
121 if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) {
|
|
122 ev->available--;
|
|
123 }
|
|
124
|
|
125 if (ev->available) {
|
|
126 /* reuse the previously allocated pool */
|
|
127 continue;
|
|
128 }
|
|
129 }
|
|
130
|
|
131 ngx_destroy_pool(pool);
|
|
132 return;
|
|
133 }
|
|
134
|
|
135 #if (NGX_STAT_STUB)
|
|
136 (*ngx_stat_accepted)++;
|
|
137 #endif
|
|
138
|
|
139 ngx_accept_disabled = (ngx_uint_t) s + NGX_ACCEPT_THRESHOLD
|
|
140 - ecf->connections;
|
|
141
|
|
142 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
|
|
143
|
|
144 if ((ngx_uint_t) s >= ecf->connections) {
|
|
145
|
|
146 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
|
|
147 "accept() on %s returned socket #%d while "
|
|
148 "only %d connections was configured, "
|
|
149 "closing the connection",
|
|
150 ls->listening->addr_text.data, s, ecf->connections);
|
|
151
|
|
152 ngx_close_accepted_socket(s, log);
|
|
153 ngx_destroy_pool(pool);
|
|
154 return;
|
|
155 }
|
|
156
|
|
157 #if (NGX_STAT_STUB)
|
|
158 (*ngx_stat_active)++;
|
|
159 #endif
|
|
160
|
|
161 /* set a blocking mode for aio and non-blocking mode for the others */
|
|
162
|
|
163 if (ngx_inherited_nonblocking) {
|
|
164 if ((ngx_event_flags & NGX_USE_AIO_EVENT)) {
|
|
165 if (ngx_blocking(s) == -1) {
|
|
166 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
|
|
167 ngx_blocking_n " failed");
|
|
168
|
|
169 ngx_close_accepted_socket(s, log);
|
|
170 ngx_destroy_pool(pool);
|
|
171 return;
|
|
172 }
|
|
173 }
|
|
174
|
|
175 } else {
|
|
176 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
|
|
177 if (ngx_nonblocking(s) == -1) {
|
|
178 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
|
|
179 ngx_nonblocking_n " failed");
|
|
180
|
|
181 ngx_close_accepted_socket(s, log);
|
|
182 ngx_destroy_pool(pool);
|
|
183 return;
|
|
184 }
|
|
185 }
|
|
186 }
|
|
187
|
|
188 #if (WIN32)
|
|
189 /*
|
|
190 * Winsock assignes a socket number divisible by 4
|
|
191 * so to find a connection we divide a socket number by 4.
|
|
192 */
|
|
193
|
|
194 if (s % 4) {
|
|
195 ngx_log_error(NGX_LOG_EMERG, ev->log, 0,
|
|
196 "accept() on %s returned socket #%d, "
|
|
197 "not divisible by 4",
|
|
198 ls->listening->addr_text.data, s);
|
|
199 exit(1);
|
|
200 }
|
|
201
|
|
202 c = &ngx_cycle->connections[s / 4];
|
|
203 rev = &ngx_cycle->read_events[s / 4];
|
|
204 wev = &ngx_cycle->write_events[s / 4];
|
|
205 #else
|
|
206 c = &ngx_cycle->connections[s];
|
|
207 rev = &ngx_cycle->read_events[s];
|
|
208 wev = &ngx_cycle->write_events[s];
|
|
209 #endif
|
|
210
|
|
211 instance = rev->instance;
|
|
212
|
|
213 #if (NGX_THREADS)
|
|
214
|
|
215 if (*(&c->lock)) {
|
|
216 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
217 "spinlock in accept, fd:%", s);
|
|
218 ngx_spinlock(&c->lock, 1000);
|
|
219 ngx_unlock(&c->lock);
|
|
220 }
|
|
221
|
|
222 #endif
|
|
223
|
|
224 ngx_memzero(rev, sizeof(ngx_event_t));
|
|
225 ngx_memzero(wev, sizeof(ngx_event_t));
|
|
226 ngx_memzero(c, sizeof(ngx_connection_t));
|
|
227
|
|
228 c->pool = pool;
|
|
229
|
|
230 c->listening = ls->listening;
|
|
231 c->sockaddr = sa;
|
|
232 c->socklen = len;
|
|
233
|
|
234 rev->instance = !instance;
|
|
235 wev->instance = !instance;
|
|
236
|
|
237 rev->index = NGX_INVALID_INDEX;
|
|
238 wev->index = NGX_INVALID_INDEX;
|
|
239
|
|
240 rev->data = c;
|
|
241 wev->data = c;
|
|
242
|
|
243 c->read = rev;
|
|
244 c->write = wev;
|
|
245
|
|
246 c->fd = s;
|
|
247 c->unexpected_eof = 1;
|
|
248
|
|
249 wev->write = 1;
|
|
250 wev->ready = 1;
|
|
251
|
|
252 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
|
|
253 /* epoll, rtsig, aio, iocp */
|
|
254 rev->ready = 1;
|
|
255 }
|
|
256
|
|
257 if (ev->deferred_accept) {
|
|
258 rev->ready = 1;
|
|
259 }
|
|
260
|
|
261 c->ctx = ls->ctx;
|
|
262 c->servers = ls->servers;
|
|
263
|
|
264 c->recv = ngx_recv;
|
|
265 c->send_chain = ngx_send_chain;
|
|
266
|
|
267 c->log = log;
|
|
268 rev->log = log;
|
|
269 wev->log = log;
|
|
270
|
|
271 /*
|
|
272 * TODO: MT: - atomic increment (x86: lock xadd)
|
|
273 * or protection by critical section or light mutex
|
|
274 *
|
|
275 * TODO: MP: - allocated in a shared memory
|
|
276 * - atomic increment (x86: lock xadd)
|
|
277 * or protection by critical section or light mutex
|
|
278 */
|
|
279
|
|
280 c->number = ngx_atomic_inc(ngx_connection_counter);
|
|
281
|
|
282 #if (NGX_THREADS)
|
|
283 rev->lock = &c->lock;
|
|
284 wev->lock = &c->lock;
|
|
285 rev->own_lock = &c->lock;
|
|
286 wev->own_lock = &c->lock;
|
|
287 #endif
|
|
288
|
|
289 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
290 "accept: fd:%d c:%d", s, c->number);
|
|
291
|
|
292 if (c->listening->addr_ntop) {
|
|
293 c->addr_text.data = ngx_palloc(c->pool,
|
|
294 c->listening->addr_text_max_len);
|
|
295 if (c->addr_text.data == NULL) {
|
|
296 ngx_close_accepted_socket(s, log);
|
|
297 ngx_destroy_pool(pool);
|
|
298 return;
|
|
299 }
|
|
300
|
|
301 c->addr_text.len = ngx_sock_ntop(c->listening->family, c->sockaddr,
|
|
302 c->addr_text.data,
|
|
303 c->listening->addr_text_max_len);
|
|
304 if (c->addr_text.len == 0) {
|
|
305 ngx_close_accepted_socket(s, log);
|
|
306 ngx_destroy_pool(pool);
|
|
307 return;
|
|
308 }
|
|
309 }
|
|
310
|
|
311 #if (NGX_DEBUG)
|
|
312 {
|
|
313
|
|
314 uint32_t *addr;
|
|
315 in_addr_t i;
|
|
316 struct sockaddr_in *addr_in;
|
|
317
|
|
318 addr_in = (struct sockaddr_in *) sa;
|
|
319 addr = ecf->debug_connection.elts;
|
|
320 for (i = 0; i < ecf->debug_connection.nelts; i++) {
|
|
321 if (addr[i] == addr_in->sin_addr.s_addr) {
|
|
322 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
|
|
323 break;
|
|
324 }
|
|
325 }
|
|
326
|
|
327 }
|
|
328 #endif
|
|
329
|
|
330 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
|
|
331 if (ngx_add_conn(c) == NGX_ERROR) {
|
|
332 ngx_close_accepted_socket(s, log);
|
|
333 ngx_destroy_pool(pool);
|
|
334 return;
|
|
335 }
|
|
336 }
|
|
337
|
|
338 pool = NULL;
|
|
339
|
|
340 log->data = NULL;
|
|
341 log->handler = NULL;
|
|
342
|
|
343 ls->listening->handler(c);
|
|
344
|
|
345 if (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) {
|
|
346 ev->available--;
|
|
347 }
|
|
348
|
|
349 accepted++;
|
|
350
|
|
351 } while (ev->available);
|
|
352 }
|
|
353
|
|
354
|
|
355 ngx_int_t ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
|
|
356 {
|
|
357 if (*ngx_accept_mutex == 0
|
|
358 && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid))
|
|
359 {
|
|
360 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
361 "accept mutex locked");
|
|
362
|
|
363 if (!ngx_accept_mutex_held) {
|
|
364 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
|
|
365 *ngx_accept_mutex = 0;
|
|
366 return NGX_ERROR;
|
|
367 }
|
|
368
|
|
369 ngx_accept_mutex_held = 1;
|
|
370 }
|
|
371
|
|
372 return NGX_OK;
|
|
373 }
|
|
374
|
|
375 if (ngx_accept_mutex_held) {
|
|
376 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
|
|
377 return NGX_ERROR;
|
|
378 }
|
|
379
|
|
380 ngx_accept_mutex_held = 0;
|
|
381 }
|
|
382
|
|
383 return NGX_OK;
|
|
384 }
|
|
385
|
|
386
|
|
387 ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle)
|
|
388 {
|
|
389 ngx_uint_t i;
|
|
390 ngx_listening_t *s;
|
|
391
|
|
392 s = cycle->listening.elts;
|
|
393 for (i = 0; i < cycle->listening.nelts; i++) {
|
|
394
|
|
395 /*
|
|
396 * we do not need to handle the Winsock sockets here (divide a socket
|
|
397 * number by 4) because this function would never called
|
|
398 * in the Winsock environment
|
|
399 */
|
|
400
|
|
401 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
|
|
402 if (ngx_add_conn(&cycle->connections[s[i].fd]) == NGX_ERROR) {
|
|
403 return NGX_ERROR;
|
|
404 }
|
|
405
|
|
406 } else {
|
|
407 if (ngx_add_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT, 0)
|
|
408 == NGX_ERROR)
|
|
409 {
|
|
410 return NGX_ERROR;
|
|
411 }
|
|
412 }
|
|
413 }
|
|
414
|
|
415 return NGX_OK;
|
|
416 }
|
|
417
|
|
418
|
|
419 ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle)
|
|
420 {
|
|
421 ngx_uint_t i;
|
|
422 ngx_listening_t *s;
|
|
423
|
|
424 s = cycle->listening.elts;
|
|
425 for (i = 0; i < cycle->listening.nelts; i++) {
|
|
426
|
|
427 /*
|
|
428 * we do not need to handle the Winsock sockets here (divide a socket
|
|
429 * number by 4) because this function would never called
|
|
430 * in the Winsock environment
|
|
431 */
|
|
432
|
|
433 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
|
|
434 if (!cycle->connections[s[i].fd].read->active) {
|
|
435 continue;
|
|
436 }
|
|
437
|
|
438 if (ngx_del_conn(&cycle->connections[s[i].fd], NGX_DISABLE_EVENT)
|
|
439 == NGX_ERROR)
|
|
440 {
|
|
441 return NGX_ERROR;
|
|
442 }
|
|
443
|
|
444 } else {
|
|
445 if (!cycle->read_events[s[i].fd].active) {
|
|
446 continue;
|
|
447 }
|
|
448
|
|
449 if (ngx_del_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT,
|
|
450 NGX_DISABLE_EVENT) == NGX_ERROR)
|
|
451 {
|
|
452 return NGX_ERROR;
|
|
453 }
|
|
454 }
|
|
455 }
|
|
456
|
|
457 return NGX_OK;
|
|
458 }
|
|
459
|
|
460
|
|
461 static void ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log)
|
|
462 {
|
|
463 if (ngx_close_socket(s) == -1) {
|
|
464 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
|
|
465 ngx_close_socket_n " failed");
|
|
466 }
|
|
467 }
|
|
468
|
|
469
|
|
470 static size_t ngx_accept_log_error(void *data, char *buf, size_t len)
|
|
471 {
|
|
472 ngx_accept_log_ctx_t *ctx = data;
|
|
473
|
|
474 return ngx_snprintf(buf, len, " while accept() on %s", ctx->name);
|
|
475 }
|