| /* |
| * |
| * Copyright 2017 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include "src/core/lib/iomgr/port.h" |
| |
| #ifdef GRPC_POSIX_SOCKET |
| |
| #include "src/core/lib/iomgr/tcp_server_utils_posix.h" |
| |
| #include <errno.h> |
| #include <limits.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/sync.h> |
| |
| #include "src/core/lib/iomgr/error.h" |
| #include "src/core/lib/iomgr/sockaddr.h" |
| #include "src/core/lib/iomgr/sockaddr_utils.h" |
| #include "src/core/lib/iomgr/unix_sockets_posix.h" |
| |
| #define MIN_SAFE_ACCEPT_QUEUE_SIZE 100 |
| |
| static gpr_once s_init_max_accept_queue_size = GPR_ONCE_INIT; |
| static int s_max_accept_queue_size; |
| |
| /* get max listen queue size on linux */ |
| static void init_max_accept_queue_size(void) { |
| int n = SOMAXCONN; |
| char buf[64]; |
| FILE *fp = fopen("/proc/sys/net/core/somaxconn", "r"); |
| if (fp == NULL) { |
| /* 2.4 kernel. */ |
| s_max_accept_queue_size = SOMAXCONN; |
| return; |
| } |
| if (fgets(buf, sizeof buf, fp)) { |
| char *end; |
| long i = strtol(buf, &end, 10); |
| if (i > 0 && i <= INT_MAX && end && *end == 0) { |
| n = (int)i; |
| } |
| } |
| fclose(fp); |
| s_max_accept_queue_size = n; |
| |
| if (s_max_accept_queue_size < MIN_SAFE_ACCEPT_QUEUE_SIZE) { |
| gpr_log(GPR_INFO, |
| "Suspiciously small accept queue (%d) will probably lead to " |
| "connection drops", |
| s_max_accept_queue_size); |
| } |
| } |
| |
| static int get_max_accept_queue_size(void) { |
| gpr_once_init(&s_init_max_accept_queue_size, init_max_accept_queue_size); |
| return s_max_accept_queue_size; |
| } |
| |
| static grpc_error *add_socket_to_server(grpc_tcp_server *s, int fd, |
| const grpc_resolved_address *addr, |
| unsigned port_index, unsigned fd_index, |
| grpc_tcp_listener **listener) { |
| grpc_tcp_listener *sp = NULL; |
| int port = -1; |
| char *addr_str; |
| char *name; |
| |
| grpc_error *err = |
| grpc_tcp_server_prepare_socket(fd, addr, s->so_reuseport, &port); |
| if (err == GRPC_ERROR_NONE) { |
| GPR_ASSERT(port > 0); |
| grpc_sockaddr_to_string(&addr_str, addr, 1); |
| gpr_asprintf(&name, "tcp-server-listener:%s", addr_str); |
| gpr_mu_lock(&s->mu); |
| s->nports++; |
| GPR_ASSERT(!s->on_accept_cb && "must add ports before starting server"); |
| sp = (grpc_tcp_listener *)gpr_malloc(sizeof(grpc_tcp_listener)); |
| sp->next = NULL; |
| if (s->head == NULL) { |
| s->head = sp; |
| } else { |
| s->tail->next = sp; |
| } |
| s->tail = sp; |
| sp->server = s; |
| sp->fd = fd; |
| sp->emfd = grpc_fd_create(fd, name); |
| memcpy(&sp->addr, addr, sizeof(grpc_resolved_address)); |
| sp->port = port; |
| sp->port_index = port_index; |
| sp->fd_index = fd_index; |
| sp->is_sibling = 0; |
| sp->sibling = NULL; |
| GPR_ASSERT(sp->emfd); |
| gpr_mu_unlock(&s->mu); |
| gpr_free(addr_str); |
| gpr_free(name); |
| } |
| |
| *listener = sp; |
| return err; |
| } |
| |
| /* If successful, add a listener to s for addr, set *dsmode for the socket, and |
| return the *listener. */ |
| grpc_error *grpc_tcp_server_add_addr(grpc_tcp_server *s, |
| const grpc_resolved_address *addr, |
| unsigned port_index, unsigned fd_index, |
| grpc_dualstack_mode *dsmode, |
| grpc_tcp_listener **listener) { |
| grpc_resolved_address addr4_copy; |
| int fd; |
| grpc_error *err = |
| grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, dsmode, &fd); |
| if (err != GRPC_ERROR_NONE) { |
| return err; |
| } |
| if (*dsmode == GRPC_DSMODE_IPV4 && |
| grpc_sockaddr_is_v4mapped(addr, &addr4_copy)) { |
| addr = &addr4_copy; |
| } |
| return add_socket_to_server(s, fd, addr, port_index, fd_index, listener); |
| } |
| |
| /* Prepare a recently-created socket for listening. */ |
| grpc_error *grpc_tcp_server_prepare_socket(int fd, |
| const grpc_resolved_address *addr, |
| bool so_reuseport, int *port) { |
| grpc_resolved_address sockname_temp; |
| grpc_error *err = GRPC_ERROR_NONE; |
| |
| GPR_ASSERT(fd >= 0); |
| |
| if (so_reuseport && !grpc_is_unix_socket(addr)) { |
| err = grpc_set_socket_reuse_port(fd, 1); |
| if (err != GRPC_ERROR_NONE) goto error; |
| } |
| |
| err = grpc_set_socket_nonblocking(fd, 1); |
| if (err != GRPC_ERROR_NONE) goto error; |
| err = grpc_set_socket_cloexec(fd, 1); |
| if (err != GRPC_ERROR_NONE) goto error; |
| if (!grpc_is_unix_socket(addr)) { |
| err = grpc_set_socket_low_latency(fd, 1); |
| if (err != GRPC_ERROR_NONE) goto error; |
| err = grpc_set_socket_reuse_addr(fd, 1); |
| if (err != GRPC_ERROR_NONE) goto error; |
| } |
| err = grpc_set_socket_no_sigpipe_if_possible(fd); |
| if (err != GRPC_ERROR_NONE) goto error; |
| |
| GPR_ASSERT(addr->len < ~(socklen_t)0); |
| if (bind(fd, (struct sockaddr *)addr->addr, (socklen_t)addr->len) < 0) { |
| err = GRPC_OS_ERROR(errno, "bind"); |
| goto error; |
| } |
| |
| if (listen(fd, get_max_accept_queue_size()) < 0) { |
| err = GRPC_OS_ERROR(errno, "listen"); |
| goto error; |
| } |
| |
| sockname_temp.len = sizeof(struct sockaddr_storage); |
| |
| if (getsockname(fd, (struct sockaddr *)sockname_temp.addr, |
| (socklen_t *)&sockname_temp.len) < 0) { |
| err = GRPC_OS_ERROR(errno, "getsockname"); |
| goto error; |
| } |
| |
| *port = grpc_sockaddr_get_port(&sockname_temp); |
| return GRPC_ERROR_NONE; |
| |
| error: |
| GPR_ASSERT(err != GRPC_ERROR_NONE); |
| if (fd >= 0) { |
| close(fd); |
| } |
| grpc_error *ret = |
| grpc_error_set_int(GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING( |
| "Unable to configure socket", &err, 1), |
| GRPC_ERROR_INT_FD, fd); |
| GRPC_ERROR_UNREF(err); |
| return ret; |
| } |
| |
| #endif /* GRPC_POSIX_SOCKET */ |