1 /*
2 *
3 * Copyright 2015 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 /* FIXME: "posix" files shouldn't be depending on _GNU_SOURCE */
20 #ifndef _GNU_SOURCE
21 #define _GNU_SOURCE
22 #endif
23
24 #include <grpc/support/port_platform.h>
25
26 #include "src/core/lib/iomgr/port.h"
27
28 #ifdef GRPC_POSIX_SOCKET_TCP_SERVER
29
30 #include <errno.h>
31 #include <fcntl.h>
32 #include <netinet/in.h>
33 #include <netinet/tcp.h>
34 #include <string.h>
35 #include <sys/socket.h>
36 #include <sys/stat.h>
37 #include <sys/types.h>
38 #include <unistd.h>
39
40 #include <string>
41
42 #include "absl/strings/str_cat.h"
43 #include "absl/strings/str_format.h"
44
45 #include <grpc/support/alloc.h>
46 #include <grpc/support/log.h>
47 #include <grpc/support/sync.h>
48 #include <grpc/support/time.h>
49
50 #include "src/core/lib/address_utils/sockaddr_utils.h"
51 #include "src/core/lib/channel/channel_args.h"
52 #include "src/core/lib/gpr/string.h"
53 #include "src/core/lib/gprpp/memory.h"
54 #include "src/core/lib/iomgr/exec_ctx.h"
55 #include "src/core/lib/iomgr/resolve_address.h"
56 #include "src/core/lib/iomgr/sockaddr.h"
57 #include "src/core/lib/iomgr/socket_utils_posix.h"
58 #include "src/core/lib/iomgr/tcp_posix.h"
59 #include "src/core/lib/iomgr/tcp_server.h"
60 #include "src/core/lib/iomgr/tcp_server_utils_posix.h"
61 #include "src/core/lib/iomgr/unix_sockets_posix.h"
62 #include "src/core/lib/resource_quota/api.h"
63
tcp_server_create(grpc_closure * shutdown_complete,const grpc_channel_args * args,grpc_tcp_server ** server)64 static grpc_error_handle tcp_server_create(grpc_closure* shutdown_complete,
65 const grpc_channel_args* args,
66 grpc_tcp_server** server) {
67 grpc_tcp_server* s = new grpc_tcp_server;
68 s->so_reuseport = grpc_is_socket_reuse_port_supported();
69 s->expand_wildcard_addrs = false;
70 for (size_t i = 0; i < (args == nullptr ? 0 : args->num_args); i++) {
71 if (0 == strcmp(GRPC_ARG_ALLOW_REUSEPORT, args->args[i].key)) {
72 if (args->args[i].type == GRPC_ARG_INTEGER) {
73 s->so_reuseport = grpc_is_socket_reuse_port_supported() &&
74 (args->args[i].value.integer != 0);
75 } else {
76 gpr_free(s);
77 return GRPC_ERROR_CREATE_FROM_STATIC_STRING(GRPC_ARG_ALLOW_REUSEPORT
78 " must be an integer");
79 }
80 } else if (0 == strcmp(GRPC_ARG_EXPAND_WILDCARD_ADDRS, args->args[i].key)) {
81 if (args->args[i].type == GRPC_ARG_INTEGER) {
82 s->expand_wildcard_addrs = (args->args[i].value.integer != 0);
83 } else {
84 gpr_free(s);
85 return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
86 GRPC_ARG_EXPAND_WILDCARD_ADDRS " must be an integer");
87 }
88 }
89 }
90 gpr_ref_init(&s->refs, 1);
91 gpr_mu_init(&s->mu);
92 s->active_ports = 0;
93 s->destroyed_ports = 0;
94 s->shutdown = false;
95 s->shutdown_starting.head = nullptr;
96 s->shutdown_starting.tail = nullptr;
97 s->shutdown_complete = shutdown_complete;
98 s->on_accept_cb = nullptr;
99 s->on_accept_cb_arg = nullptr;
100 s->head = nullptr;
101 s->tail = nullptr;
102 s->nports = 0;
103 s->channel_args = grpc_channel_args_copy(args);
104 s->fd_handler = nullptr;
105 s->memory_quota =
106 grpc_core::ResourceQuotaFromChannelArgs(args)->memory_quota();
107 gpr_atm_no_barrier_store(&s->next_pollset_to_assign, 0);
108 *server = s;
109 return GRPC_ERROR_NONE;
110 }
111
finish_shutdown(grpc_tcp_server * s)112 static void finish_shutdown(grpc_tcp_server* s) {
113 gpr_mu_lock(&s->mu);
114 GPR_ASSERT(s->shutdown);
115 gpr_mu_unlock(&s->mu);
116 if (s->shutdown_complete != nullptr) {
117 grpc_core::ExecCtx::Run(DEBUG_LOCATION, s->shutdown_complete,
118 GRPC_ERROR_NONE);
119 }
120 gpr_mu_destroy(&s->mu);
121 while (s->head) {
122 grpc_tcp_listener* sp = s->head;
123 s->head = sp->next;
124 gpr_free(sp);
125 }
126 grpc_channel_args_destroy(s->channel_args);
127 delete s->fd_handler;
128 delete s;
129 }
130
destroyed_port(void * server,grpc_error_handle)131 static void destroyed_port(void* server, grpc_error_handle /*error*/) {
132 grpc_tcp_server* s = static_cast<grpc_tcp_server*>(server);
133 gpr_mu_lock(&s->mu);
134 s->destroyed_ports++;
135 if (s->destroyed_ports == s->nports) {
136 gpr_mu_unlock(&s->mu);
137 finish_shutdown(s);
138 } else {
139 GPR_ASSERT(s->destroyed_ports < s->nports);
140 gpr_mu_unlock(&s->mu);
141 }
142 }
143
144 /* called when all listening endpoints have been shutdown, so no further
145 events will be received on them - at this point it's safe to destroy
146 things */
deactivated_all_ports(grpc_tcp_server * s)147 static void deactivated_all_ports(grpc_tcp_server* s) {
148 /* delete ALL the things */
149 gpr_mu_lock(&s->mu);
150
151 GPR_ASSERT(s->shutdown);
152
153 if (s->head) {
154 grpc_tcp_listener* sp;
155 for (sp = s->head; sp; sp = sp->next) {
156 grpc_unlink_if_unix_domain_socket(&sp->addr);
157 GRPC_CLOSURE_INIT(&sp->destroyed_closure, destroyed_port, s,
158 grpc_schedule_on_exec_ctx);
159 grpc_fd_orphan(sp->emfd, &sp->destroyed_closure, nullptr,
160 "tcp_listener_shutdown");
161 }
162 gpr_mu_unlock(&s->mu);
163 } else {
164 gpr_mu_unlock(&s->mu);
165 finish_shutdown(s);
166 }
167 }
168
tcp_server_destroy(grpc_tcp_server * s)169 static void tcp_server_destroy(grpc_tcp_server* s) {
170 gpr_mu_lock(&s->mu);
171 GPR_ASSERT(!s->shutdown);
172 s->shutdown = true;
173 /* shutdown all fd's */
174 if (s->active_ports) {
175 grpc_tcp_listener* sp;
176 for (sp = s->head; sp; sp = sp->next) {
177 grpc_fd_shutdown(
178 sp->emfd, GRPC_ERROR_CREATE_FROM_STATIC_STRING("Server destroyed"));
179 }
180 gpr_mu_unlock(&s->mu);
181 } else {
182 gpr_mu_unlock(&s->mu);
183 deactivated_all_ports(s);
184 }
185 }
186
187 /* event manager callback when reads are ready */
on_read(void * arg,grpc_error_handle err)188 static void on_read(void* arg, grpc_error_handle err) {
189 grpc_tcp_listener* sp = static_cast<grpc_tcp_listener*>(arg);
190 grpc_pollset* read_notifier_pollset;
191 if (err != GRPC_ERROR_NONE) {
192 goto error;
193 }
194
195 /* loop until accept4 returns EAGAIN, and then re-arm notification */
196 for (;;) {
197 grpc_resolved_address addr;
198 memset(&addr, 0, sizeof(addr));
199 addr.len = static_cast<socklen_t>(sizeof(struct sockaddr_storage));
200 /* Note: If we ever decide to return this address to the user, remember to
201 strip off the ::ffff:0.0.0.0/96 prefix first. */
202 int fd = grpc_accept4(sp->fd, &addr, 1, 1);
203 if (fd < 0) {
204 switch (errno) {
205 case EINTR:
206 continue;
207 case EAGAIN:
208 grpc_fd_notify_on_read(sp->emfd, &sp->read_closure);
209 return;
210 default:
211 gpr_mu_lock(&sp->server->mu);
212 if (!sp->server->shutdown_listeners) {
213 gpr_log(GPR_ERROR, "Failed accept4: %s", strerror(errno));
214 } else {
215 /* if we have shutdown listeners, accept4 could fail, and we
216 needn't notify users */
217 }
218 gpr_mu_unlock(&sp->server->mu);
219 goto error;
220 }
221 }
222
223 if (sp->server->memory_quota->IsMemoryPressureHigh()) {
224 gpr_log(GPR_INFO, "Drop incoming connection: high memory pressure");
225 close(fd);
226 continue;
227 }
228
229 /* For UNIX sockets, the accept call might not fill up the member sun_path
230 * of sockaddr_un, so explicitly call getsockname to get it. */
231 if (grpc_is_unix_socket(&addr)) {
232 memset(&addr, 0, sizeof(addr));
233 addr.len = static_cast<socklen_t>(sizeof(struct sockaddr_storage));
234 if (getsockname(fd, reinterpret_cast<struct sockaddr*>(addr.addr),
235 &(addr.len)) < 0) {
236 gpr_log(GPR_ERROR, "Failed getsockname: %s", strerror(errno));
237 close(fd);
238 goto error;
239 }
240 }
241
242 (void)grpc_set_socket_no_sigpipe_if_possible(fd);
243
244 err = grpc_apply_socket_mutator_in_args(fd, GRPC_FD_SERVER_CONNECTION_USAGE,
245 sp->server->channel_args);
246 if (err != GRPC_ERROR_NONE) {
247 goto error;
248 }
249
250 std::string addr_str = grpc_sockaddr_to_uri(&addr);
251 if (GRPC_TRACE_FLAG_ENABLED(grpc_tcp_trace)) {
252 gpr_log(GPR_INFO, "SERVER_CONNECT: incoming connection: %s",
253 addr_str.c_str());
254 }
255
256 std::string name = absl::StrCat("tcp-server-connection:", addr_str);
257 grpc_fd* fdobj = grpc_fd_create(fd, name.c_str(), true);
258
259 read_notifier_pollset = (*(sp->server->pollsets))
260 [static_cast<size_t>(gpr_atm_no_barrier_fetch_add(
261 &sp->server->next_pollset_to_assign, 1)) %
262 sp->server->pollsets->size()];
263
264 grpc_pollset_add_fd(read_notifier_pollset, fdobj);
265
266 // Create acceptor.
267 grpc_tcp_server_acceptor* acceptor =
268 static_cast<grpc_tcp_server_acceptor*>(gpr_malloc(sizeof(*acceptor)));
269 acceptor->from_server = sp->server;
270 acceptor->port_index = sp->port_index;
271 acceptor->fd_index = sp->fd_index;
272 acceptor->external_connection = false;
273 sp->server->on_accept_cb(
274 sp->server->on_accept_cb_arg,
275 grpc_tcp_create(fdobj, sp->server->channel_args, addr_str),
276 read_notifier_pollset, acceptor);
277 }
278
279 GPR_UNREACHABLE_CODE(return );
280
281 error:
282 gpr_mu_lock(&sp->server->mu);
283 if (0 == --sp->server->active_ports && sp->server->shutdown) {
284 gpr_mu_unlock(&sp->server->mu);
285 deactivated_all_ports(sp->server);
286 } else {
287 gpr_mu_unlock(&sp->server->mu);
288 }
289 }
290
291 /* Treat :: or 0.0.0.0 as a family-agnostic wildcard. */
add_wildcard_addrs_to_server(grpc_tcp_server * s,unsigned port_index,int requested_port,int * out_port)292 static grpc_error_handle add_wildcard_addrs_to_server(grpc_tcp_server* s,
293 unsigned port_index,
294 int requested_port,
295 int* out_port) {
296 grpc_resolved_address wild4;
297 grpc_resolved_address wild6;
298 unsigned fd_index = 0;
299 grpc_dualstack_mode dsmode;
300 grpc_tcp_listener* sp = nullptr;
301 grpc_tcp_listener* sp2 = nullptr;
302 grpc_error_handle v6_err = GRPC_ERROR_NONE;
303 grpc_error_handle v4_err = GRPC_ERROR_NONE;
304 *out_port = -1;
305
306 if (grpc_tcp_server_have_ifaddrs() && s->expand_wildcard_addrs) {
307 return grpc_tcp_server_add_all_local_addrs(s, port_index, requested_port,
308 out_port);
309 }
310
311 grpc_sockaddr_make_wildcards(requested_port, &wild4, &wild6);
312 /* Try listening on IPv6 first. */
313 if ((v6_err = grpc_tcp_server_add_addr(s, &wild6, port_index, fd_index,
314 &dsmode, &sp)) == GRPC_ERROR_NONE) {
315 ++fd_index;
316 requested_port = *out_port = sp->port;
317 if (dsmode == GRPC_DSMODE_DUALSTACK || dsmode == GRPC_DSMODE_IPV4) {
318 return GRPC_ERROR_NONE;
319 }
320 }
321 /* If we got a v6-only socket or nothing, try adding 0.0.0.0. */
322 grpc_sockaddr_set_port(&wild4, requested_port);
323 if ((v4_err = grpc_tcp_server_add_addr(s, &wild4, port_index, fd_index,
324 &dsmode, &sp2)) == GRPC_ERROR_NONE) {
325 *out_port = sp2->port;
326 if (sp != nullptr) {
327 sp2->is_sibling = 1;
328 sp->sibling = sp2;
329 }
330 }
331 if (*out_port > 0) {
332 if (v6_err != GRPC_ERROR_NONE) {
333 gpr_log(GPR_INFO,
334 "Failed to add :: listener, "
335 "the environment may not support IPv6: %s",
336 grpc_error_std_string(v6_err).c_str());
337 GRPC_ERROR_UNREF(v6_err);
338 }
339 if (v4_err != GRPC_ERROR_NONE) {
340 gpr_log(GPR_INFO,
341 "Failed to add 0.0.0.0 listener, "
342 "the environment may not support IPv4: %s",
343 grpc_error_std_string(v4_err).c_str());
344 GRPC_ERROR_UNREF(v4_err);
345 }
346 return GRPC_ERROR_NONE;
347 } else {
348 grpc_error_handle root_err = GRPC_ERROR_CREATE_FROM_STATIC_STRING(
349 "Failed to add any wildcard listeners");
350 GPR_ASSERT(v6_err != GRPC_ERROR_NONE && v4_err != GRPC_ERROR_NONE);
351 root_err = grpc_error_add_child(root_err, v6_err);
352 root_err = grpc_error_add_child(root_err, v4_err);
353 return root_err;
354 }
355 }
356
clone_port(grpc_tcp_listener * listener,unsigned count)357 static grpc_error_handle clone_port(grpc_tcp_listener* listener,
358 unsigned count) {
359 grpc_tcp_listener* sp = nullptr;
360 std::string addr_str;
361 grpc_error_handle err;
362
363 for (grpc_tcp_listener* l = listener->next; l && l->is_sibling; l = l->next) {
364 l->fd_index += count;
365 }
366
367 for (unsigned i = 0; i < count; i++) {
368 int fd = -1;
369 int port = -1;
370 grpc_dualstack_mode dsmode;
371 err = grpc_create_dualstack_socket(&listener->addr, SOCK_STREAM, 0, &dsmode,
372 &fd);
373 if (err != GRPC_ERROR_NONE) return err;
374 err = grpc_tcp_server_prepare_socket(listener->server, fd, &listener->addr,
375 true, &port);
376 if (err != GRPC_ERROR_NONE) return err;
377 listener->server->nports++;
378 addr_str = grpc_sockaddr_to_string(&listener->addr, true);
379 sp = static_cast<grpc_tcp_listener*>(gpr_malloc(sizeof(grpc_tcp_listener)));
380 sp->next = listener->next;
381 listener->next = sp;
382 /* sp (the new listener) is a sibling of 'listener' (the original
383 listener). */
384 sp->is_sibling = 1;
385 sp->sibling = listener->sibling;
386 listener->sibling = sp;
387 sp->server = listener->server;
388 sp->fd = fd;
389 sp->emfd = grpc_fd_create(
390 fd,
391 absl::StrFormat("tcp-server-listener:%s/clone-%d", addr_str.c_str(), i)
392 .c_str(),
393 true);
394 memcpy(&sp->addr, &listener->addr, sizeof(grpc_resolved_address));
395 sp->port = port;
396 sp->port_index = listener->port_index;
397 sp->fd_index = listener->fd_index + count - i;
398 GPR_ASSERT(sp->emfd);
399 while (listener->server->tail->next != nullptr) {
400 listener->server->tail = listener->server->tail->next;
401 }
402 }
403
404 return GRPC_ERROR_NONE;
405 }
406
tcp_server_add_port(grpc_tcp_server * s,const grpc_resolved_address * addr,int * out_port)407 static grpc_error_handle tcp_server_add_port(grpc_tcp_server* s,
408 const grpc_resolved_address* addr,
409 int* out_port) {
410 GPR_ASSERT(addr->len <= GRPC_MAX_SOCKADDR_SIZE);
411 grpc_tcp_listener* sp;
412 grpc_resolved_address sockname_temp;
413 grpc_resolved_address addr6_v4mapped;
414 int requested_port = grpc_sockaddr_get_port(addr);
415 unsigned port_index = 0;
416 grpc_dualstack_mode dsmode;
417 grpc_error_handle err;
418 *out_port = -1;
419 if (s->tail != nullptr) {
420 port_index = s->tail->port_index + 1;
421 }
422 grpc_unlink_if_unix_domain_socket(addr);
423
424 /* Check if this is a wildcard port, and if so, try to keep the port the same
425 as some previously created listener. */
426 if (requested_port == 0) {
427 for (sp = s->head; sp; sp = sp->next) {
428 sockname_temp.len =
429 static_cast<socklen_t>(sizeof(struct sockaddr_storage));
430 if (0 ==
431 getsockname(sp->fd,
432 reinterpret_cast<grpc_sockaddr*>(&sockname_temp.addr),
433 &sockname_temp.len)) {
434 int used_port = grpc_sockaddr_get_port(&sockname_temp);
435 if (used_port > 0) {
436 memcpy(&sockname_temp, addr, sizeof(grpc_resolved_address));
437 grpc_sockaddr_set_port(&sockname_temp, used_port);
438 requested_port = used_port;
439 addr = &sockname_temp;
440 break;
441 }
442 }
443 }
444 }
445 if (grpc_sockaddr_is_wildcard(addr, &requested_port)) {
446 return add_wildcard_addrs_to_server(s, port_index, requested_port,
447 out_port);
448 }
449 if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) {
450 addr = &addr6_v4mapped;
451 }
452 if ((err = grpc_tcp_server_add_addr(s, addr, port_index, 0, &dsmode, &sp)) ==
453 GRPC_ERROR_NONE) {
454 *out_port = sp->port;
455 }
456 return err;
457 }
458
459 /* Return listener at port_index or NULL. Should only be called with s->mu
460 locked. */
get_port_index(grpc_tcp_server * s,unsigned port_index)461 static grpc_tcp_listener* get_port_index(grpc_tcp_server* s,
462 unsigned port_index) {
463 unsigned num_ports = 0;
464 grpc_tcp_listener* sp;
465 for (sp = s->head; sp; sp = sp->next) {
466 if (!sp->is_sibling) {
467 if (++num_ports > port_index) {
468 return sp;
469 }
470 }
471 }
472 return nullptr;
473 }
474
tcp_server_port_fd_count(grpc_tcp_server * s,unsigned port_index)475 unsigned tcp_server_port_fd_count(grpc_tcp_server* s, unsigned port_index) {
476 unsigned num_fds = 0;
477 gpr_mu_lock(&s->mu);
478 grpc_tcp_listener* sp = get_port_index(s, port_index);
479 for (; sp; sp = sp->sibling) {
480 ++num_fds;
481 }
482 gpr_mu_unlock(&s->mu);
483 return num_fds;
484 }
485
tcp_server_port_fd(grpc_tcp_server * s,unsigned port_index,unsigned fd_index)486 static int tcp_server_port_fd(grpc_tcp_server* s, unsigned port_index,
487 unsigned fd_index) {
488 gpr_mu_lock(&s->mu);
489 grpc_tcp_listener* sp = get_port_index(s, port_index);
490 for (; sp; sp = sp->sibling, --fd_index) {
491 if (fd_index == 0) {
492 gpr_mu_unlock(&s->mu);
493 return sp->fd;
494 }
495 }
496 gpr_mu_unlock(&s->mu);
497 return -1;
498 }
499
tcp_server_start(grpc_tcp_server * s,const std::vector<grpc_pollset * > * pollsets,grpc_tcp_server_cb on_accept_cb,void * on_accept_cb_arg)500 static void tcp_server_start(grpc_tcp_server* s,
501 const std::vector<grpc_pollset*>* pollsets,
502 grpc_tcp_server_cb on_accept_cb,
503 void* on_accept_cb_arg) {
504 size_t i;
505 grpc_tcp_listener* sp;
506 GPR_ASSERT(on_accept_cb);
507 gpr_mu_lock(&s->mu);
508 GPR_ASSERT(!s->on_accept_cb);
509 GPR_ASSERT(s->active_ports == 0);
510 s->on_accept_cb = on_accept_cb;
511 s->on_accept_cb_arg = on_accept_cb_arg;
512 s->pollsets = pollsets;
513 sp = s->head;
514 while (sp != nullptr) {
515 if (s->so_reuseport && !grpc_is_unix_socket(&sp->addr) &&
516 pollsets->size() > 1) {
517 GPR_ASSERT(GRPC_LOG_IF_ERROR(
518 "clone_port", clone_port(sp, (unsigned)(pollsets->size() - 1))));
519 for (i = 0; i < pollsets->size(); i++) {
520 grpc_pollset_add_fd((*pollsets)[i], sp->emfd);
521 GRPC_CLOSURE_INIT(&sp->read_closure, on_read, sp,
522 grpc_schedule_on_exec_ctx);
523 grpc_fd_notify_on_read(sp->emfd, &sp->read_closure);
524 s->active_ports++;
525 sp = sp->next;
526 }
527 } else {
528 for (i = 0; i < pollsets->size(); i++) {
529 grpc_pollset_add_fd((*pollsets)[i], sp->emfd);
530 }
531 GRPC_CLOSURE_INIT(&sp->read_closure, on_read, sp,
532 grpc_schedule_on_exec_ctx);
533 grpc_fd_notify_on_read(sp->emfd, &sp->read_closure);
534 s->active_ports++;
535 sp = sp->next;
536 }
537 }
538 gpr_mu_unlock(&s->mu);
539 }
540
tcp_server_ref(grpc_tcp_server * s)541 grpc_tcp_server* tcp_server_ref(grpc_tcp_server* s) {
542 gpr_ref_non_zero(&s->refs);
543 return s;
544 }
545
tcp_server_shutdown_starting_add(grpc_tcp_server * s,grpc_closure * shutdown_starting)546 static void tcp_server_shutdown_starting_add(grpc_tcp_server* s,
547 grpc_closure* shutdown_starting) {
548 gpr_mu_lock(&s->mu);
549 grpc_closure_list_append(&s->shutdown_starting, shutdown_starting,
550 GRPC_ERROR_NONE);
551 gpr_mu_unlock(&s->mu);
552 }
553
tcp_server_unref(grpc_tcp_server * s)554 static void tcp_server_unref(grpc_tcp_server* s) {
555 if (gpr_unref(&s->refs)) {
556 grpc_tcp_server_shutdown_listeners(s);
557 gpr_mu_lock(&s->mu);
558 grpc_core::ExecCtx::RunList(DEBUG_LOCATION, &s->shutdown_starting);
559 gpr_mu_unlock(&s->mu);
560 tcp_server_destroy(s);
561 }
562 }
563
tcp_server_shutdown_listeners(grpc_tcp_server * s)564 static void tcp_server_shutdown_listeners(grpc_tcp_server* s) {
565 gpr_mu_lock(&s->mu);
566 s->shutdown_listeners = true;
567 /* shutdown all fd's */
568 if (s->active_ports) {
569 grpc_tcp_listener* sp;
570 for (sp = s->head; sp; sp = sp->next) {
571 grpc_fd_shutdown(sp->emfd,
572 GRPC_ERROR_CREATE_FROM_STATIC_STRING("Server shutdown"));
573 }
574 }
575 gpr_mu_unlock(&s->mu);
576 }
577
578 namespace {
579 class ExternalConnectionHandler : public grpc_core::TcpServerFdHandler {
580 public:
ExternalConnectionHandler(grpc_tcp_server * s)581 explicit ExternalConnectionHandler(grpc_tcp_server* s) : s_(s) {}
582
583 // TODO(yangg) resolve duplicate code with on_read
Handle(int listener_fd,int fd,grpc_byte_buffer * buf)584 void Handle(int listener_fd, int fd, grpc_byte_buffer* buf) override {
585 grpc_pollset* read_notifier_pollset;
586 grpc_resolved_address addr;
587 memset(&addr, 0, sizeof(addr));
588 addr.len = static_cast<socklen_t>(sizeof(struct sockaddr_storage));
589 grpc_core::ExecCtx exec_ctx;
590
591 if (getpeername(fd, reinterpret_cast<struct sockaddr*>(addr.addr),
592 &(addr.len)) < 0) {
593 gpr_log(GPR_ERROR, "Failed getpeername: %s", strerror(errno));
594 close(fd);
595 return;
596 }
597 (void)grpc_set_socket_no_sigpipe_if_possible(fd);
598 std::string addr_str = grpc_sockaddr_to_uri(&addr);
599 if (grpc_tcp_trace.enabled()) {
600 gpr_log(GPR_INFO, "SERVER_CONNECT: incoming external connection: %s",
601 addr_str.c_str());
602 }
603 std::string name = absl::StrCat("tcp-server-connection:", addr_str);
604 grpc_fd* fdobj = grpc_fd_create(fd, name.c_str(), true);
605 read_notifier_pollset =
606 (*(s_->pollsets))[static_cast<size_t>(gpr_atm_no_barrier_fetch_add(
607 &s_->next_pollset_to_assign, 1)) %
608 s_->pollsets->size()];
609 grpc_pollset_add_fd(read_notifier_pollset, fdobj);
610 grpc_tcp_server_acceptor* acceptor =
611 static_cast<grpc_tcp_server_acceptor*>(gpr_malloc(sizeof(*acceptor)));
612 acceptor->from_server = s_;
613 acceptor->port_index = -1;
614 acceptor->fd_index = -1;
615 acceptor->external_connection = true;
616 acceptor->listener_fd = listener_fd;
617 acceptor->pending_data = buf;
618 s_->on_accept_cb(s_->on_accept_cb_arg,
619 grpc_tcp_create(fdobj, s_->channel_args, addr_str),
620 read_notifier_pollset, acceptor);
621 }
622
623 private:
624 grpc_tcp_server* s_;
625 };
626 } // namespace
627
tcp_server_create_fd_handler(grpc_tcp_server * s)628 static grpc_core::TcpServerFdHandler* tcp_server_create_fd_handler(
629 grpc_tcp_server* s) {
630 s->fd_handler = new ExternalConnectionHandler(s);
631 return s->fd_handler;
632 }
633
634 grpc_tcp_server_vtable grpc_posix_tcp_server_vtable = {
635 tcp_server_create, tcp_server_start,
636 tcp_server_add_port, tcp_server_create_fd_handler,
637 tcp_server_port_fd_count, tcp_server_port_fd,
638 tcp_server_ref, tcp_server_shutdown_starting_add,
639 tcp_server_unref, tcp_server_shutdown_listeners};
640
641 #endif /* GRPC_POSIX_SOCKET_TCP_SERVER */
642