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/*
*
* 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 <grpc/support/port_platform.h>
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_POSIX_SOCKET_TCP_SERVER_UTILS_COMMON
#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 == nullptr) {
/* 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 == '\n') {
n = static_cast<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 = nullptr;
int port = -1;
char* addr_str;
char* name;
grpc_error* err =
grpc_tcp_server_prepare_socket(s, 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 = static_cast<grpc_tcp_listener*>(gpr_malloc(sizeof(grpc_tcp_listener)));
sp->next = nullptr;
if (s->head == nullptr) {
s->head = sp;
} else {
s->tail->next = sp;
}
s->tail = sp;
sp->server = s;
sp->fd = fd;
sp->emfd = grpc_fd_create(fd, name, false);
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 = nullptr;
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(grpc_tcp_server* s, 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;
if (s->channel_args) {
for (size_t i = 0; i < s->channel_args->num_args; i++) {
if (0 == strcmp(s->channel_args->args[i].key, GRPC_ARG_SOCKET_MUTATOR)) {
GPR_ASSERT(s->channel_args->args[i].type == GRPC_ARG_POINTER);
grpc_socket_mutator* mutator = static_cast<grpc_socket_mutator*>(
s->channel_args->args[i].value.pointer.p);
err = grpc_set_socket_with_mutator(fd, mutator);
if (err != GRPC_ERROR_NONE) goto error;
}
}
}
if (bind(fd, reinterpret_cast<grpc_sockaddr*>(const_cast<char*>(addr->addr)),
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 = static_cast<socklen_t>(sizeof(struct sockaddr_storage));
if (getsockname(fd, reinterpret_cast<grpc_sockaddr*>(sockname_temp.addr),
&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_TCP_SERVER_UTILS_COMMON */
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