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memcached.cc
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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* memcached - memory caching daemon
*
* http://www.danga.com/memcached/
*
* Copyright 2003 Danga Interactive, Inc. All rights reserved.
*
* Use and distribution licensed under the BSD license. See
* the LICENSE file for full text.
*
* Authors:
* Anatoly Vorobey <mellon@pobox.com>
* Brad Fitzpatrick <brad@danga.com>
*/
#include "config.h"
#include "memcached.h"
#include "alloc_hooks.h"
#include "buckets.h"
#include "cmdline.h"
#include "config_parse.h"
#include "connections.h"
#include "cookie.h"
#include "debug_helpers.h"
#include "doc_pre_expiry.h"
#include "enginemap.h"
#include "executor.h"
#include "executorpool.h"
#include "external_auth_manager_thread.h"
#include "front_end_thread.h"
#include "ioctl.h"
#include "libevent_locking.h"
#include "log_macros.h"
#include "logger/logger.h"
#include "mc_time.h"
#include "mcaudit.h"
#include "mcbp.h"
#include "mcbp_executors.h"
#include "mcbp_topkeys.h"
#include "mcbp_validators.h"
#include "mcbpdestroybuckettask.h"
#include "memcached/audit_interface.h"
#include "memcached_openssl.h"
#include "parent_monitor.h"
#include "protocol/mcbp/engine_wrapper.h"
#include "runtime.h"
#include "server_socket.h"
#include "session_cas.h"
#include "settings.h"
#include "stats.h"
#include "subdocument.h"
#include "timings.h"
#include "topkeys.h"
#include "tracing.h"
#include "utilities/engine_loader.h"
#include "utilities/terminate_handler.h"
#include <cbsasl/logging.h>
#include <cbsasl/mechanism.h>
#include <engines/default_engine.h>
#include <mcbp/mcbp.h>
#include <memcached/audit_interface.h>
#include <memcached/rbac.h>
#include <memcached/server_cookie_iface.h>
#include <memcached/server_core_iface.h>
#include <memcached/server_document_iface.h>
#include <memcached/server_log_iface.h>
#include <memcached/util.h>
#include <nlohmann/json.hpp>
#include <phosphor/phosphor.h>
#include <platform/cb_malloc.h>
#include <platform/dirutils.h>
#include <platform/interrupt.h>
#include <platform/socket.h>
#include <platform/strerror.h>
#include <platform/sysinfo.h>
#include <snappy-c.h>
#include <utilities/breakpad.h>
#include <gsl/gsl>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <algorithm>
#include <memory>
#if HAVE_LIBNUMA
#include <numa.h>
#endif
#include <limits.h>
#include <math.h>
#ifndef WIN32
#include <netinet/tcp.h> // For TCP_NODELAY etc
#include <sysexits.h>
#endif
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <vector>
/**
* All of the buckets in couchbase is stored in this array.
*/
static std::mutex buckets_lock;
std::array<Bucket, COUCHBASE_MAX_NUM_BUCKETS + 1> all_buckets;
void bucketsForEach(std::function<bool(Bucket&, void*)> fn, void *arg) {
std::lock_guard<std::mutex> all_bucket_lock(buckets_lock);
for (Bucket& bucket : all_buckets) {
bool do_break = false;
std::lock_guard<std::mutex> guard(bucket.mutex);
if (bucket.state == BucketState::Ready) {
if (!fn(bucket, arg)) {
do_break = true;
}
}
if (do_break) {
break;
}
}
}
std::atomic<bool> memcached_shutdown;
std::atomic<bool> service_online;
std::unique_ptr<ExecutorPool> executorPool;
/* Mutex for global stats */
std::mutex stats_mutex;
/*
* forward declarations
*/
static void register_callback(EngineIface* eh,
ENGINE_EVENT_TYPE type,
EVENT_CALLBACK cb,
const void* cb_data);
static void create_listen_sockets();
/* stats */
static void stats_init();
/* defaults */
static void settings_init();
/** exported globals **/
struct stats stats;
/** file scope variables **/
std::vector<std::unique_ptr<ServerSocket>> listen_conn;
static struct event_base *main_base;
static engine_event_handler_array_t engine_event_handlers;
/*
* MB-12470 requests an easy way to see when (some of) the statistics
* counters were reset. This functions grabs the current time and tries
* to format it to the current timezone by using ctime_r/s (which adds
* a newline at the end for some obscure reason which we'll need to
* strip off).
*
* This function expects that the stats lock is held by the caller to get
* a "sane" result (otherwise one thread may see a garbled version), but
* no crash will occur since the buffer is big enough and always zero
* terminated.
*/
char reset_stats_time[80];
static void set_stats_reset_time()
{
time_t now = time(nullptr);
#ifdef WIN32
ctime_s(reset_stats_time, sizeof(reset_stats_time), &now);
#else
ctime_r(&now, reset_stats_time);
#endif
char *ptr = strchr(reset_stats_time, '\n');
if (ptr) {
*ptr = '\0';
}
}
void disassociate_bucket(Connection& connection) {
Bucket& b = connection.getBucket();
std::lock_guard<std::mutex> guard(b.mutex);
b.clients--;
connection.setBucketIndex(0);
if (b.clients == 0 && b.state == BucketState::Destroying) {
b.cond.notify_one();
}
}
bool associate_bucket(Connection& connection, const char* name) {
bool found = false;
/* leave the current bucket */
disassociate_bucket(connection);
/* Try to associate with the named bucket */
/* @todo add auth checks!!! */
for (size_t ii = 1; ii < all_buckets.size() && !found; ++ii) {
Bucket &b = all_buckets.at(ii);
std::lock_guard<std::mutex> guard(b.mutex);
if (b.state == BucketState::Ready && strcmp(b.name, name) == 0) {
b.clients++;
connection.setBucketIndex(gsl::narrow<int>(ii));
audit_bucket_selection(connection);
found = true;
}
}
if (!found) {
/* Bucket not found, connect to the "no-bucket" */
Bucket &b = all_buckets.at(0);
{
std::lock_guard<std::mutex> guard(b.mutex);
b.clients++;
}
connection.setBucketIndex(0);
}
return found;
}
void associate_initial_bucket(Connection& connection) {
Bucket &b = all_buckets.at(0);
{
std::lock_guard<std::mutex> guard(b.mutex);
b.clients++;
}
connection.setBucketIndex(0);
if (is_default_bucket_enabled()) {
associate_bucket(connection, "default");
}
}
static void populate_log_level(void*) {
const auto val = settings.getLogLevel();
// Log the verbosity value set by the user and not the log level as they
// are inverted
LOG_INFO("Changing logging level to {}", settings.getVerbose());
cb::logger::setLogLevels(val);
}
/* Perform all callbacks of a given type for the given connection. */
void perform_callbacks(ENGINE_EVENT_TYPE type,
const void *data,
const void *void_cookie)
{
cb_thread_t tid;
switch (type) {
/*
* The following events operates on a connection which is passed in
* as the cookie.
*/
case ON_DISCONNECT: {
const auto * cookie = reinterpret_cast<const Cookie *>(void_cookie);
if (cookie == nullptr) {
throw std::invalid_argument("perform_callbacks: cookie is nullptr");
}
const auto bucket_idx = cookie->getConnection().getBucketIndex();
if (bucket_idx == -1) {
throw std::logic_error(
"perform_callbacks: connection (which is " +
std::to_string(cookie->getConnection().getId()) +
") cannot be "
"disconnected as it is not associated with a bucket");
}
for (auto& handler : all_buckets[bucket_idx].engine_event_handlers[type]) {
handler.cb(void_cookie, ON_DISCONNECT, data, handler.cb_data);
}
break;
}
case ON_LOG_LEVEL:
if (void_cookie != nullptr) {
throw std::invalid_argument("perform_callbacks: cookie "
"(which is " +
std::to_string(reinterpret_cast<uintptr_t>(void_cookie)) +
") should be NULL for ON_LOG_LEVEL");
}
for (auto& handler : engine_event_handlers[type]) {
handler.cb(void_cookie, ON_LOG_LEVEL, data, handler.cb_data);
}
if (service_online) {
if (cb_create_thread(&tid, populate_log_level, nullptr, 1) == -1) {
LOG_WARNING(
"Failed to create thread to notify engines about "
"changing log level");
}
}
break;
case ON_DELETE_BUCKET: {
/** cookie is the bucket entry */
auto* bucket = reinterpret_cast<const Bucket*>(void_cookie);
for (auto& handler : bucket->engine_event_handlers[type]) {
handler.cb(void_cookie, ON_DELETE_BUCKET, data, handler.cb_data);
}
break;
}
default:
throw std::invalid_argument("perform_callbacks: type "
"(which is " + std::to_string(type) +
"is not a valid ENGINE_EVENT_TYPE");
}
}
static void register_callback(EngineIface* eh,
ENGINE_EVENT_TYPE type,
EVENT_CALLBACK cb,
const void* cb_data) {
size_t idx;
switch (type) {
/*
* The following events operates on a connection which is passed in
* as the cookie.
*/
case ON_DISCONNECT:
case ON_DELETE_BUCKET:
if (eh == nullptr) {
throw std::invalid_argument("register_callback: 'eh' must be non-NULL");
}
for (idx = 0; idx < all_buckets.size(); ++idx) {
if ((void*)eh == (void*)all_buckets[idx].getEngine()) {
break;
}
}
if (idx == all_buckets.size()) {
throw std::invalid_argument("register_callback: eh (which is " +
std::to_string(reinterpret_cast<uintptr_t>(eh)) +
") is not a engine associated with a bucket");
}
all_buckets[idx].engine_event_handlers[type].push_back({cb, cb_data});
break;
case ON_LOG_LEVEL:
if (eh != nullptr) {
throw std::invalid_argument("register_callback: 'eh' must be NULL");
}
engine_event_handlers[type].push_back({cb, cb_data});
break;
default:
throw std::invalid_argument("register_callback: type (which is " +
std::to_string(type) +
") is not a valid ENGINE_EVENT_TYPE");
}
}
static void free_callbacks() {
// free per-bucket callbacks.
for (auto& bucket : all_buckets) {
for (auto& type_vec : bucket.engine_event_handlers) {
type_vec.clear();
}
}
// free global callbacks
for (auto& type_vec : engine_event_handlers) {
type_vec.clear();
}
}
static void stats_init() {
set_stats_reset_time();
stats.conn_structs.reset();
stats.total_conns.reset();
stats.daemon_conns.reset();
stats.rejected_conns.reset();
stats.curr_conns.store(0, std::memory_order_relaxed);
}
struct thread_stats* get_thread_stats(Connection* c) {
cb_assert(c->getThread()->index < (settings.getNumWorkerThreads() + 1));
auto& independent_stats = all_buckets[c->getBucketIndex()].stats;
return &independent_stats.at(c->getThread()->index);
}
void stats_reset(Cookie& cookie) {
{
std::lock_guard<std::mutex> guard(stats_mutex);
set_stats_reset_time();
}
stats.total_conns.reset();
stats.rejected_conns.reset();
threadlocal_stats_reset(cookie.getConnection().getBucket().stats);
bucket_reset_stats(cookie);
}
static size_t get_number_of_worker_threads() {
size_t ret = 0;
char *override = getenv("MEMCACHED_NUM_CPUS");
if (override) {
try {
ret = std::stoull(override);
} catch (...) {
}
} else {
// No override specified; determine worker thread count based
// on the CPU count:
// <5 cores: create 4 workers.
// >5+ cores: create #CPUs * 7/8.
ret = Couchbase::get_available_cpu_count();
if (ret > 4) {
ret = (ret * 7) / 8;
}
if (ret < 4) {
ret = 4;
}
}
if (ret == 0) {
ret = 4;
}
return ret;
}
static void breakpad_changed_listener(const std::string&, Settings &s) {
cb::breakpad::initialize(s.getBreakpadSettings());
}
static void ssl_minimum_protocol_changed_listener(const std::string&, Settings &s) {
set_ssl_protocol_mask(s.getSslMinimumProtocol());
}
static void ssl_cipher_list_changed_listener(const std::string&, Settings &s) {
set_ssl_cipher_list(s.getSslCipherList());
}
static void verbosity_changed_listener(const std::string&, Settings &s) {
auto logger = cb::logger::get();
if (logger) {
logger->set_level(settings.getLogLevel());
}
perform_callbacks(ON_LOG_LEVEL, nullptr, nullptr);
}
static void scramsha_fallback_salt_changed_listener(const std::string&,
Settings& s) {
cb::sasl::server::set_scramsha_fallback_salt(s.getScramshaFallbackSalt());
}
static void opcode_attributes_override_changed_listener(const std::string&,
Settings& s) {
try {
cb::mcbp::sla::reconfigure(
settings.getRoot(),
nlohmann::json::parse(s.getOpcodeAttributesOverride()));
} catch (const std::exception&) {
cb::mcbp::sla::reconfigure(settings.getRoot());
}
LOG_INFO("SLA configuration changed to: {}",
cb::mcbp::sla::to_json().dump());
}
static void interfaces_changed_listener(const std::string&, Settings &s) {
for (const auto& ifc : s.getInterfaces()) {
auto* port = get_listening_port_instance(ifc.port);
if (port != nullptr) {
port->maxconns = ifc.maxconn;
port->tcp_nodelay = ifc.tcp_nodelay;
port->setSslSettings(ifc.ssl.key, ifc.ssl.cert);
}
}
s.calculateMaxconns();
}
#ifdef HAVE_LIBNUMA
/** Configure the NUMA policy for memcached. By default will attempt to set to
* interleaved polocy, unless the env var MEMCACHED_NUMA_MEM_POLICY is set to
* 'disable'.
* @return A log message describing what action was taken.
*
*/
static std::string configure_numa_policy() {
if (numa_available() != 0) {
return "Not available - not setting mem policy.";
}
// Attempt to set the default NUMA memory policy to interleaved,
// unless overridden by our env var.
const char* mem_policy_env = getenv("MEMCACHED_NUMA_MEM_POLICY");
if (mem_policy_env && strcmp("disable", mem_policy_env) == 0) {
return std::string("NOT setting memory allocation policy - disabled "
"via MEMCACHED_NUMA_MEM_POLICY='") + mem_policy_env + "'";
} else {
errno = 0;
numa_set_interleave_mask(numa_all_nodes_ptr);
if (errno == 0) {
return "Set memory allocation policy to 'interleave'";
} else {
return std::string("NOT setting memory allocation policy to "
"'interleave' - request failed: ") + cb_strerror();
}
}
}
#endif // HAVE_LIBNUMA
static void settings_init() {
// Set up the listener functions
settings.addChangeListener("breakpad",
breakpad_changed_listener);
settings.addChangeListener("ssl_minimum_protocol",
ssl_minimum_protocol_changed_listener);
settings.addChangeListener("ssl_cipher_list",
ssl_cipher_list_changed_listener);
settings.addChangeListener("verbosity", verbosity_changed_listener);
settings.addChangeListener("interfaces", interfaces_changed_listener);
settings.addChangeListener("scramsha_fallback_salt",
scramsha_fallback_salt_changed_listener);
settings.addChangeListener(
"active_external_users_push_interval",
[](const std::string&, Settings& s) -> void {
if (externalAuthManager) {
externalAuthManager->setPushActiveUsersInterval(
s.getActiveExternalUsersPushInterval());
}
});
NetworkInterface default_interface;
settings.addInterface(default_interface);
settings.setBioDrainBufferSize(8192);
settings.setVerbose(0);
settings.setConnectionIdleTime(0); // Connection idle time disabled
settings.setNumWorkerThreads(get_number_of_worker_threads());
settings.setDatatypeJsonEnabled(true);
settings.setDatatypeSnappyEnabled(true);
settings.setRequestsPerEventNotification(50, EventPriority::High);
settings.setRequestsPerEventNotification(5, EventPriority::Medium);
settings.setRequestsPerEventNotification(1, EventPriority::Low);
settings.setRequestsPerEventNotification(20, EventPriority::Default);
/*
* The max object size is 20MB. Let's allow packets up to 30MB to
* be handled "properly" by returing E2BIG, but packets bigger
* than that will cause the server to disconnect the client
*/
settings.setMaxPacketSize(30 * 1024 * 1024);
settings.setDedupeNmvbMaps(false);
char *tmp = getenv("MEMCACHED_TOP_KEYS");
settings.setTopkeysSize(20);
if (tmp) {
int count;
if (safe_strtol(tmp, count)) {
settings.setTopkeysSize(count);
}
}
{
// MB-13642 Allow the user to specify the SSL cipher list
// If someone wants to use SSL we should try to be "secure
// by default", and only allow for using strong ciphers.
// Users that may want to use a less secure cipher list
// should be allowed to do so by setting an environment
// variable (since there is no place in the UI to do
// so currently). Whenever ns_server allows for specifying
// the SSL cipher list in the UI, it will be stored
// in memcached.json and override these settings.
const char *env = getenv("COUCHBASE_SSL_CIPHER_LIST");
if (env == nullptr) {
settings.setSslCipherList("HIGH");
} else {
settings.setSslCipherList(env);
}
}
settings.setSslMinimumProtocol("tlsv1");
if (getenv("COUCHBASE_ENABLE_PRIVILEGE_DEBUG") != nullptr) {
settings.setPrivilegeDebug(true);
}
settings.setTopkeysEnabled(true);
}
/**
* The config file may have altered some of the default values we're
* caching in other variables. This is the place where we'd propagate
* such changes.
*
* This is also the place to initialize any additional files needed by
* Memcached.
*/
static void update_settings_from_config()
{
std::string root(DESTINATION_ROOT);
if (!settings.getRoot().empty()) {
root = settings.getRoot();
}
if (settings.getErrorMapsDir().empty()) {
// Set the error map dir.
std::string error_maps_dir(root + "/etc/couchbase/kv/error_maps");
cb::io::sanitizePath(error_maps_dir);
if (cb::io::isDirectory(error_maps_dir)) {
settings.setErrorMapsDir(error_maps_dir);
}
}
try {
cb::mcbp::sla::reconfigure(root);
} catch (const std::exception& e) {
FATAL_ERROR(EXIT_FAILURE, e.what());
}
settings.addChangeListener("opcode_attributes_override",
opcode_attributes_override_changed_listener);
}
struct {
std::mutex mutex;
bool disabled = false;
ssize_t count = 0;
uint64_t num_disable = 0;
} listen_state;
bool is_listen_disabled() {
std::lock_guard<std::mutex> guard(listen_state.mutex);
return listen_state.disabled;
}
uint64_t get_listen_disabled_num() {
std::lock_guard<std::mutex> guard(listen_state.mutex);
return listen_state.num_disable;
}
void disable_listen() {
{
std::lock_guard<std::mutex> guard(listen_state.mutex);
listen_state.disabled = true;
listen_state.count = 10;
++listen_state.num_disable;
}
for (auto& connection : listen_conn) {
connection->disable();
}
}
void safe_close(SOCKET sfd) {
if (sfd != INVALID_SOCKET) {
int rval;
do {
rval = evutil_closesocket(sfd);
} while (rval == SOCKET_ERROR &&
cb::net::is_interrupted(cb::net::get_socket_error()));
if (rval == SOCKET_ERROR) {
std::string error = cb_strerror();
LOG_WARNING("Failed to close socket {} ({})!!", (int)sfd, error);
} else {
stats.curr_conns.fetch_sub(1, std::memory_order_relaxed);
if (is_listen_disabled()) {
notify_dispatcher();
}
}
}
}
static nlohmann::json get_bucket_details_UNLOCKED(const Bucket& bucket,
size_t idx) {
nlohmann::json json;
if (bucket.state != BucketState::None) {
try {
json["index"] = idx;
json["state"] = to_string(bucket.state.load());
json["clients"] = bucket.clients;
json["name"] = bucket.name;
json["type"] = to_string(bucket.type);
} catch (const std::exception& e) {
LOG_ERROR("Failed to generate bucket details: {}", e.what());
}
}
return json;
}
nlohmann::json get_bucket_details(size_t idx) {
Bucket& bucket = all_buckets.at(idx);
std::lock_guard<std::mutex> guard(bucket.mutex);
return get_bucket_details_UNLOCKED(bucket, idx);
}
/**
* Check if the associated bucket is dying or not. There is two reasons
* for why a bucket could be dying: It is currently being deleted, or
* someone initiated a shutdown process.
*/
bool is_bucket_dying(Connection& c) {
bool disconnect = memcached_shutdown;
auto& b = c.getBucket();
if (b.state != BucketState::Ready) {
disconnect = true;
}
if (disconnect) {
LOG_INFO(
"{}: The connected bucket is being deleted.. closing "
"connection {}",
c.getId(),
c.getDescription());
c.setState(StateMachine::State::closing);
return true;
}
return false;
}
void event_handler(evutil_socket_t fd, short which, void *arg) {
auto* c = reinterpret_cast<Connection*>(arg);
if (c == nullptr) {
LOG_WARNING("event_handler: connection must be non-NULL");
return;
}
auto *thr = c->getThread();
if (thr == nullptr) {
LOG_WARNING(
"Internal error - connection without a thread found. - "
"ignored");
return;
}
// Remove the list from the list of pending io's (in case the
// object was scheduled to run in the dispatcher before the
// callback for the worker thread is executed.
//
{
std::lock_guard<std::mutex> lock(thr->pending_io.mutex);
auto iter = thr->pending_io.map.find(c);
if (iter != thr->pending_io.map.end()) {
for (const auto& pair : iter->second) {
if (pair.first) {
pair.first->setAiostat(pair.second);
pair.first->setEwouldblock(false);
}
}
thr->pending_io.map.erase(iter);
}
}
// Remove the connection from the notification list if it's there
thr->notification.remove(c);
TRACE_LOCKGUARD_TIMED(thr->mutex,
"mutex",
"event_handler::threadLock",
SlowMutexThreshold);
if (memcached_shutdown) {
// Someone requested memcached to shut down.
if (signal_idle_clients(*thr) == 0) {
cb_assert(thr != nullptr);
LOG_INFO("Stopping worker thread {}", thr->index);
c->eventBaseLoopbreak();
return;
}
}
/* sanity */
cb_assert(fd == c->getSocketDescriptor());
run_event_loop(c, which);
if (memcached_shutdown) {
// Someone requested memcached to shut down. If we don't have
// any connections bound to this thread we can just shut down
int connected = signal_idle_clients(*thr);
if (connected == 0) {
LOG_INFO("Stopping worker thread {}", thr->index);
event_base_loopbreak(thr->base);
} else {
LOG_INFO("Waiting for {} connected clients on worker thread {}",
connected,
thr->index);
}
}
}
/**
* The listen_event_handler is the callback from libevent when someone is
* connecting to one of the server sockets. It runs in the context of the
* listen thread
*/
void listen_event_handler(evutil_socket_t, short, void *arg) {
auto& c = *reinterpret_cast<ServerSocket*>(arg);
if (memcached_shutdown) {
// Someone requested memcached to shut down. The listen thread should
// be stopped immediately to avoid new connections
LOG_INFO("Stopping listen thread");
event_base_loopbreak(main_base);
return;
}
try {
c.acceptNewClient();
} catch (std::invalid_argument& e) {
LOG_WARNING("{}: exception occurred while accepting clients: {}",
c.getSocket(),
e.what());
}
}
static void dispatch_event_handler(evutil_socket_t fd, short, void *) {
char buffer[80];
ssize_t nr = cb::net::recv(fd, buffer, sizeof(buffer), 0);
if (nr != -1 && is_listen_disabled()) {
bool enable = false;
{
std::lock_guard<std::mutex> guard(listen_state.mutex);
listen_state.count -= nr;
if (listen_state.count <= 0) {
enable = true;
listen_state.disabled = false;
}
}
if (enable) {
for (auto& connection : listen_conn) {
connection->enable();
}
}
}
}
/*
* Sets a socket's send buffer size to the maximum allowed by the system.
*/
static void maximize_sndbuf(const SOCKET sfd) {
socklen_t intsize = sizeof(int);
int last_good = 0;
int old_size;
/* Start with the default size. */
if (cb::net::getsockopt(sfd,
SOL_SOCKET,
SO_SNDBUF,
reinterpret_cast<void*>(&old_size),
&intsize) != 0) {
LOG_WARNING("getsockopt(SO_SNDBUF): {}", strerror(errno));
return;
}
/* Binary-search for the real maximum. */
int min = old_size;
int max = MAX_SENDBUF_SIZE;
while (min <= max) {
int avg = ((unsigned int)(min + max)) / 2;
if (cb::net::setsockopt(sfd,
SOL_SOCKET,
SO_SNDBUF,
reinterpret_cast<void*>(&avg),
intsize) == 0) {
last_good = avg;
min = avg + 1;
} else {
max = avg - 1;
}
}
LOG_DEBUG("<{} send buffer was {}, now {}", sfd, old_size, last_good);
}
static SOCKET new_server_socket(struct addrinfo *ai, bool tcp_nodelay) {
SOCKET sfd;
sfd = cb::net::socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sfd == INVALID_SOCKET) {
return INVALID_SOCKET;
}
if (evutil_make_socket_nonblocking(sfd) == -1) {
safe_close(sfd);
return INVALID_SOCKET;
}
maximize_sndbuf(sfd);
const struct linger ling = {0, 0};
const int flags = 1;
int error;
#ifdef IPV6_V6ONLY
if (ai->ai_family == AF_INET6) {
error = cb::net::setsockopt(sfd,
IPPROTO_IPV6,
IPV6_V6ONLY,
reinterpret_cast<const void*>(&flags),
sizeof(flags));
if (error != 0) {
LOG_WARNING("setsockopt(IPV6_V6ONLY): {}", strerror(errno));
safe_close(sfd);
return INVALID_SOCKET;
}
}
#endif
if (cb::net::setsockopt(sfd,
SOL_SOCKET,
SO_REUSEADDR,
reinterpret_cast<const void*>(&flags),
sizeof(flags)) != 0) {
LOG_WARNING("setsockopt(SO_REUSEADDR): {}",
cb_strerror(cb::net::get_socket_error()));
}
if (cb::net::setsockopt(sfd,
SOL_SOCKET,
SO_KEEPALIVE,
reinterpret_cast<const void*>(&flags),
sizeof(flags)) != 0) {
LOG_WARNING("setsockopt(SO_KEEPALIVE): {}",
cb_strerror(cb::net::get_socket_error()));
}
if (cb::net::setsockopt(sfd,
SOL_SOCKET,
SO_LINGER,
reinterpret_cast<const char*>(&ling),
sizeof(ling)) != 0) {
LOG_WARNING("setsockopt(SO_LINGER): {}",
cb_strerror(cb::net::get_socket_error()));
}
if (tcp_nodelay) {
if (cb::net::setsockopt(sfd,
IPPROTO_TCP,
TCP_NODELAY,
reinterpret_cast<const void*>(&flags),
sizeof(flags)) != 0) {
LOG_WARNING("setsockopt(TCP_NODELAY): {}",
cb_strerror(cb::net::get_socket_error()));
}
}
return sfd;
}
/**
* Add a port to the list of interfaces we're listening to.
*
* We're supporting binding to the port number "0" to have the operating
* system pick an available port we may use (and we'll report it back to
* the user through the portnumber file.). If we have knowledge of the port,
* update the port descriptor (ip4/ip6), if not go ahead and create a new entry
*
* @param interf the interface description used to create the port
* @param port the port number in use
* @param family the address family for the port
*/
static void add_listening_port(const NetworkInterface *interf, in_port_t port, sa_family_t family) {
std::lock_guard<std::mutex> guard(stats_mutex);
auto *descr = get_listening_port_instance(port);
if (descr == nullptr) {
ListeningPort newport(port, interf->host, interf->tcp_nodelay);
newport.curr_conns = 1;
newport.maxconns = interf->maxconn;
newport.setSslSettings(interf->ssl.key, interf->ssl.cert);
if (family == AF_INET) {
newport.ipv4 = true;
newport.ipv6 = false;
} else if (family == AF_INET6) {
newport.ipv4 = false;
newport.ipv6 = true;
}
stats.listening_ports.push_back(newport);
} else {
if (family == AF_INET) {
descr->ipv4 = true;
} else if (family == AF_INET6) {
descr->ipv6 = true;
}