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1500 lines (1275 loc) · 48.9 KB
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/*
Copyright (c) 2013, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "sql/conn_handler/socket_connection.h"
#include "my_config.h"
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#ifndef _WIN32
#include <netdb.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <algorithm>
#include <atomic>
#include <memory> // std::unique_ptr
#include <new>
#include <utility>
#include "m_string.h"
#include "my_dbug.h"
#include "my_io.h"
#include "my_loglevel.h"
#include "my_sys.h"
#include "my_thread.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/psi/mysql_thread.h"
#include "mysqld_error.h"
#include "sql-common/net_ns.h"
#include "sql/auth/sql_security_ctx.h"
#include "sql/conn_handler/channel_info.h" // Channel_info
#include "sql/conn_handler/init_net_server_extension.h" // init_net_server_extension
#include "sql/log.h"
#include "sql/mysqld.h" // key_socket_tcpip
#include "sql/sql_class.h" // THD
#include "sql/sql_const.h"
#include "violite.h" // Vio
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifdef HAVE_LIBWRAP
#include <syslog.h>
#ifndef HAVE_LIBWRAP_PROTOTYPES
extern "C" {
#include <tcpd.h>
}
#else
#include <tcpd.h>
#endif
#endif
#include "connection_handler_manager.h"
using std::max;
// Test accept this many times
static constexpr const uint MAX_ACCEPT_RETRY{10};
/** Number of connection errors when selecting on the listening port */
static std::atomic<ulong> connection_errors_query_block{0};
/** Number of connection errors when accepting sockets in the listening port. */
static std::atomic<ulong> connection_errors_accept{0};
/** Number of connection errors from TCP wrappers. */
static std::atomic<ulong> connection_errors_tcpwrap{0};
namespace {
struct FreeAddrInfoDeleter {
void operator()(addrinfo *ai) {
if (ai != nullptr) {
freeaddrinfo(ai);
}
}
};
using AddrInfoPtr = std::unique_ptr<addrinfo, FreeAddrInfoDeleter>;
AddrInfoPtr GetAddrInfoPtr(const char *node, const char *service,
const addrinfo *hints) {
addrinfo *p = nullptr;
int err = getaddrinfo(node, service, hints, &p);
AddrInfoPtr nrv{p};
return (err == 0 ? std::move(nrv) : nullptr);
}
} // namespace
ulong get_connection_errors_query_block() {
return connection_errors_query_block.load();
}
ulong get_connection_errors_accept() { return connection_errors_accept.load(); }
ulong get_connection_errors_tcpwrap() {
return connection_errors_tcpwrap.load();
}
#ifdef HAVE_LIBWRAP
static const char *libwrap_name;
#endif
///////////////////////////////////////////////////////////////////////////
// Channel_info_local_socket implementation
///////////////////////////////////////////////////////////////////////////
/**
This class abstracts the info. about local socket mode of communication with
the server.
*/
class Channel_info_local_socket : public Channel_info {
// connect socket object
MYSQL_SOCKET m_connect_sock;
protected:
Vio *create_and_init_vio() const override {
Vio *vio =
mysql_socket_vio_new(m_connect_sock, VIO_TYPE_SOCKET, VIO_LOCALHOST);
#ifdef USE_PPOLL_IN_VIO
if (vio != nullptr) {
// Unset thread_id, to ensure that all shutdowns explicitly set the
// current real_id from the THD.
vio->thread_id.reset();
vio->signal_mask = mysqld_signal_mask;
}
#endif
return vio;
}
public:
/**
Constructor that sets the connect socket.
@param connect_socket set connect socket descriptor.
*/
Channel_info_local_socket(MYSQL_SOCKET connect_socket)
: m_connect_sock(connect_socket) {}
THD *create_thd() override {
THD *thd = Channel_info::create_thd();
if (thd != nullptr) {
init_net_server_extension(thd);
thd->security_context()->set_host_ptr(my_localhost, strlen(my_localhost));
}
return thd;
}
void send_error_and_close_channel(uint errorcode, int error,
bool senderror) override {
Channel_info::send_error_and_close_channel(errorcode, error, senderror);
mysql_socket_shutdown(m_connect_sock, SHUT_RDWR);
mysql_socket_close(m_connect_sock);
}
};
///////////////////////////////////////////////////////////////////////////
// Channel_info_tcpip_socket implementation
///////////////////////////////////////////////////////////////////////////
/**
This class abstracts the info. about TCP/IP socket mode of communication with
the server.
*/
class Channel_info_tcpip_socket : public Channel_info {
// connect socket object
MYSQL_SOCKET m_connect_sock;
/*
Flag specifying whether a connection is admin connection or
ordinary connection.
*/
bool m_is_admin_conn;
#ifdef HAVE_SETNS
/*
Network namespace associated with the socket.
*/
std::string m_network_namespace;
#endif
protected:
Vio *create_and_init_vio() const override {
Vio *vio = mysql_socket_vio_new(m_connect_sock, VIO_TYPE_TCPIP, 0);
#ifdef USE_PPOLL_IN_VIO
if (vio != nullptr) {
vio->thread_id.reset();
vio->signal_mask = mysqld_signal_mask;
}
#endif
#ifdef HAVE_SETNS
strncpy(vio->network_namespace, m_network_namespace.c_str(),
sizeof(vio->network_namespace) - 1);
vio->network_namespace[sizeof(vio->network_namespace) - 1] = '\0';
#endif
return vio;
}
public:
/**
Constructor that sets the connect socket.
@param connect_socket set connect socket descriptor.
@param is_admin_conn flag specifying whether a connection is admin
connection.
*/
Channel_info_tcpip_socket(MYSQL_SOCKET connect_socket, bool is_admin_conn)
: m_connect_sock(connect_socket), m_is_admin_conn(is_admin_conn) {}
THD *create_thd() override {
THD *thd = Channel_info::create_thd();
if (thd != nullptr) {
thd->set_admin_connection(m_is_admin_conn);
init_net_server_extension(thd);
}
return thd;
}
void send_error_and_close_channel(uint errorcode, int error,
bool senderror) override {
Channel_info::send_error_and_close_channel(errorcode, error, senderror);
mysql_socket_shutdown(m_connect_sock, SHUT_RDWR);
mysql_socket_close(m_connect_sock);
}
bool is_admin_connection() const override { return m_is_admin_conn; }
#ifdef HAVE_SETNS
/**
Set a network namespace for channel.
@param network_namespace Network namespace associated with a channel.
*/
void set_network_namespace(const std::string &network_namespace) {
m_network_namespace = network_namespace;
}
#endif
};
///////////////////////////////////////////////////////////////////////////
// TCP_socket implementation
///////////////////////////////////////////////////////////////////////////
#ifdef _WIN32
using Socket_error_message_buf = TCHAR[1024];
#endif
/**
MY_BIND_ALL_ADDRESSES defines a special value for the bind-address option,
which means that the server should listen to all available network addresses,
both IPv6 (if available) and IPv4.
Basically, this value instructs the server to make an attempt to bind the
server socket to '::' address, and rollback to '0.0.0.0' if the attempt fails.
*/
const char *MY_BIND_ALL_ADDRESSES = "*";
const char *ipv4_all_addresses = "0.0.0.0";
const char *ipv6_all_addresses = "::";
/**
TCP_socket class represents the TCP sockets abstraction. It provides
the get_listener_socket that setup a TCP listener socket to listen.
*/
class TCP_socket {
std::string m_bind_addr_str; // IP address as string.
std::string m_network_namespace; // Network namespace if specified
uint m_tcp_port; // TCP port to bind to
uint m_backlog; // Backlog length for queue of pending connections.
uint m_port_timeout; // Port timeout
MYSQL_SOCKET create_socket(const struct addrinfo *addrinfo_list,
int addr_family, struct addrinfo **use_addrinfo) {
for (const struct addrinfo *cur_ai = addrinfo_list; cur_ai != nullptr;
cur_ai = cur_ai->ai_next) {
if (cur_ai->ai_family != addr_family) continue;
MYSQL_SOCKET sock =
mysql_socket_socket(key_socket_tcpip, cur_ai->ai_family,
cur_ai->ai_socktype, cur_ai->ai_protocol);
char ip_addr[INET6_ADDRSTRLEN];
if (vio_getnameinfo(cur_ai->ai_addr, ip_addr, sizeof(ip_addr), nullptr, 0,
NI_NUMERICHOST)) {
ip_addr[0] = 0;
}
if (mysql_socket_getfd(sock) == INVALID_SOCKET) {
LogErr(ERROR_LEVEL, ER_CONN_TCP_NO_SOCKET,
(addr_family == AF_INET) ? "IPv4" : "IPv6",
(const char *)ip_addr, (int)socket_errno);
} else {
LogErr(INFORMATION_LEVEL, ER_CONN_TCP_CREATED, (const char *)ip_addr);
*use_addrinfo = const_cast<addrinfo *>(cur_ai);
return sock;
}
}
return MYSQL_INVALID_SOCKET;
}
public:
/**
Constructor that takes tcp port and ip address string and other
related parameters to set up listener tcp to listen for connection
events.
@param bind_addr_str ip address as string value.
@param network_namespace_str network namespace as string value
@param tcp_port tcp port number.
@param backlog backlog specifying length of pending connection queue.
@param port_timeout port timeout value
*/
TCP_socket(std::string bind_addr_str, std::string network_namespace_str,
uint tcp_port, uint backlog, uint port_timeout)
: m_bind_addr_str(bind_addr_str),
m_network_namespace(network_namespace_str),
m_tcp_port(tcp_port),
m_backlog(backlog),
m_port_timeout(port_timeout) {}
/**
Set up a listener to listen for connection events.
@retval valid socket if successful else MYSQL_INVALID_SOCKET on failure.
*/
MYSQL_SOCKET get_listener_socket() {
const char *bind_address_str = nullptr;
LogErr(INFORMATION_LEVEL, ER_CONN_TCP_ADDRESS, m_bind_addr_str.c_str(),
m_tcp_port);
// Get list of IP-addresses associated with the bind-address.
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_socktype = SOCK_STREAM;
hints.ai_family = AF_UNSPEC;
char port_buf[NI_MAXSERV];
snprintf(port_buf, NI_MAXSERV, "%d", m_tcp_port);
if (!m_network_namespace.empty()) {
#ifdef HAVE_SETNS
if (set_network_namespace(m_network_namespace))
return MYSQL_INVALID_SOCKET;
#else
LogErr(ERROR_LEVEL, ER_NETWORK_NAMESPACES_NOT_SUPPORTED);
return MYSQL_INVALID_SOCKET;
#endif
}
// Create a RAII guard for addrinfo struct.
AddrInfoPtr ai_ptr{nullptr};
if (native_strcasecmp(m_bind_addr_str.c_str(), MY_BIND_ALL_ADDRESSES) ==
0) {
/*
That's the case when bind-address is set to a special value ('*'),
meaning "bind to all available IP addresses". If the box supports
the IPv6 stack, that means binding to '::'. If only IPv4 is available,
bind to '0.0.0.0'.
*/
bool ipv6_available = false;
ai_ptr = GetAddrInfoPtr(ipv6_all_addresses, port_buf, &hints);
if (ai_ptr) {
/*
IPv6 might be available (the system might be able to resolve an IPv6
address, but not be able to create an IPv6-socket). Try to create a
dummy IPv6-socket. Do not instrument that socket by P_S.
*/
MYSQL_SOCKET s = mysql_socket_socket(0, AF_INET6, SOCK_STREAM, 0);
ipv6_available = mysql_socket_getfd(s) != INVALID_SOCKET;
if (ipv6_available) mysql_socket_close(s);
}
if (ipv6_available &&
DBUG_EVALUATE_IF("sim_ipv6_unavailable", false, true)) {
LogErr(INFORMATION_LEVEL, ER_CONN_TCP_IPV6_AVAILABLE);
// Address info (ai) for IPv6 address is already set.
bind_address_str = ipv6_all_addresses;
} else {
LogErr(INFORMATION_LEVEL, ER_CONN_TCP_IPV6_UNAVAILABLE);
// Retrieve address info (ai) for IPv4 address.
ai_ptr = GetAddrInfoPtr(ipv4_all_addresses, port_buf, &hints);
if (!ai_ptr) {
#ifdef _WIN32
Socket_error_message_buf msg_buff;
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, socket_errno,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)msg_buff, sizeof(msg_buff), NULL);
LogErr(ERROR_LEVEL, ER_CONN_TCP_ERROR_WITH_STRERROR, msg_buff);
#else
LogErr(ERROR_LEVEL, ER_CONN_TCP_ERROR_WITH_STRERROR, strerror(errno));
#endif
LogErr(ERROR_LEVEL, ER_CONN_TCP_CANT_RESOLVE_HOSTNAME);
#ifdef HAVE_SETNS
if (!m_network_namespace.empty())
(void)restore_original_network_namespace();
#endif
return MYSQL_INVALID_SOCKET;
} // !ai_ptr
bind_address_str = ipv4_all_addresses;
}
} else {
ai_ptr = GetAddrInfoPtr(m_bind_addr_str.c_str(), port_buf, &hints);
if (!ai_ptr) {
#ifdef _WIN32
Socket_error_message_buf msg_buff;
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, socket_errno,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)msg_buff, sizeof(msg_buff), NULL);
LogErr(ERROR_LEVEL, ER_CONN_TCP_ERROR_WITH_STRERROR, msg_buff);
#else
LogErr(ERROR_LEVEL, ER_CONN_TCP_ERROR_WITH_STRERROR, strerror(errno));
#endif
LogErr(ERROR_LEVEL, ER_CONN_TCP_CANT_RESOLVE_HOSTNAME);
#ifdef HAVE_SETNS
if (!m_network_namespace.empty())
(void)restore_original_network_namespace();
#endif
return MYSQL_INVALID_SOCKET;
} // !ai_ptr
bind_address_str = m_bind_addr_str.c_str();
}
// Log all the IP-addresses
for (struct addrinfo *cur_ai = ai_ptr.get(); cur_ai != nullptr;
cur_ai = cur_ai->ai_next) {
char ip_addr[INET6_ADDRSTRLEN];
if (vio_getnameinfo(cur_ai->ai_addr, ip_addr, sizeof(ip_addr), nullptr, 0,
NI_NUMERICHOST)) {
LogErr(ERROR_LEVEL, ER_CONN_TCP_IP_NOT_LOGGED);
continue;
}
LogErr(INFORMATION_LEVEL, ER_CONN_TCP_RESOLVE_INFO, bind_address_str,
ip_addr);
}
/*
If the 'bind-address' option specifies the hostname, which resolves to
multiple IP-address, use the following rule:
- if there are IPv4-addresses, use the first IPv4-address
returned by getaddrinfo();
- if there are IPv6-addresses, use the first IPv6-address
returned by getaddrinfo();
*/
struct addrinfo *a = nullptr;
MYSQL_SOCKET listener_socket = create_socket(ai_ptr.get(), AF_INET, &a);
if (mysql_socket_getfd(listener_socket) == INVALID_SOCKET)
listener_socket = create_socket(ai_ptr.get(), AF_INET6, &a);
#ifdef HAVE_SETNS
if (!m_network_namespace.empty() && restore_original_network_namespace())
return MYSQL_INVALID_SOCKET;
#endif
// Report user-error if we failed to create a socket.
if (mysql_socket_getfd(listener_socket) == INVALID_SOCKET) {
#ifdef _WIN32
Socket_error_message_buf msg_buff;
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, socket_errno,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)msg_buff,
sizeof(msg_buff), NULL);
LogErr(ERROR_LEVEL, ER_CONN_TCP_ERROR_WITH_STRERROR, msg_buff);
#else
LogErr(ERROR_LEVEL, ER_CONN_TCP_ERROR_WITH_STRERROR, strerror(errno));
#endif
return MYSQL_INVALID_SOCKET;
}
mysql_socket_set_thread_owner(listener_socket);
#ifndef _WIN32
/*
We should not use SO_REUSEADDR on windows as this would enable a
user to open two mysqld servers with the same TCP/IP port.
*/
{
int option_flag = 1;
(void)mysql_socket_setsockopt(listener_socket, SOL_SOCKET, SO_REUSEADDR,
(char *)&option_flag, sizeof(option_flag));
}
#endif
#ifdef IPV6_V6ONLY
/*
For interoperability with older clients, IPv6 socket should
listen on both IPv6 and IPv4 wildcard addresses.
Turn off IPV6_V6ONLY option.
NOTE: this will work starting from Windows Vista only.
On Windows XP dual stack is not available, so it will not
listen on the corresponding IPv4-address.
*/
if (a->ai_family == AF_INET6) {
int option_flag = 0;
if (mysql_socket_setsockopt(listener_socket, IPPROTO_IPV6, IPV6_V6ONLY,
(char *)&option_flag, sizeof(option_flag))) {
LogErr(WARNING_LEVEL, ER_CONN_TCP_CANT_RESET_V6ONLY, (int)socket_errno);
}
}
#endif
/*
Sometimes the port is not released fast enough when stopping and
restarting the server. This happens quite often with the test suite
on busy Linux systems. Retry to bind the address at these intervals:
Sleep intervals: 1, 2, 4, 6, 9, 13, 17, 22, ...
Retry at second: 1, 3, 7, 13, 22, 35, 52, 74, ...
Limit the sequence by m_port_timeout (set --port-open-timeout=#).
*/
uint this_wait = 0;
int ret = 0;
for (uint waited = 0, retry = 1;; retry++, waited += this_wait) {
if (((ret = mysql_socket_bind(listener_socket, a->ai_addr,
a->ai_addrlen)) >= 0) ||
(socket_errno != SOCKET_EADDRINUSE) || (waited >= m_port_timeout))
break;
LogErr(INFORMATION_LEVEL, ER_CONN_TCP_BIND_RETRY, mysqld_port);
this_wait = retry * retry / 3 + 1;
sleep(this_wait);
}
if (ret < 0) {
DBUG_PRINT("error", ("Got error: %d from bind", socket_errno));
#ifdef _WIN32
Socket_error_message_buf msg_buff;
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, socket_errno,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)msg_buff,
sizeof(msg_buff), NULL);
LogErr(ERROR_LEVEL, ER_CONN_TCP_BIND_FAIL, msg_buff);
#else
LogErr(ERROR_LEVEL, ER_CONN_TCP_BIND_FAIL, strerror(socket_errno));
#endif
LogErr(ERROR_LEVEL, ER_CONN_TCP_IS_THERE_ANOTHER_USING_PORT, m_tcp_port);
mysql_socket_close(listener_socket);
return MYSQL_INVALID_SOCKET;
}
if (mysql_socket_listen(listener_socket, static_cast<int>(m_backlog)) < 0) {
#ifdef _WIN32
Socket_error_message_buf msg_buff;
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, socket_errno,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)msg_buff,
sizeof(msg_buff), NULL);
LogErr(ERROR_LEVEL, ER_CONN_TCP_START_FAIL, msg_buff);
#else
LogErr(ERROR_LEVEL, ER_CONN_TCP_START_FAIL, strerror(errno));
#endif
LogErr(ERROR_LEVEL, ER_CONN_TCP_LISTEN_FAIL, socket_errno);
mysql_socket_close(listener_socket);
return MYSQL_INVALID_SOCKET;
}
#if !defined(NO_FCNTL_NONBLOCK)
(void)mysql_sock_set_nonblocking(listener_socket);
#endif
return listener_socket;
}
};
#if defined(HAVE_SYS_UN_H)
///////////////////////////////////////////////////////////////////////////
// Unix_socket implementation
///////////////////////////////////////////////////////////////////////////
/**
The Unix_socket class represents an abstraction for creating a unix
socket ready to listen for new connections from clients.
*/
class Unix_socket {
std::string m_unix_sockname; // pathname for socket to bind to.
uint m_backlog; // backlog specifying length of pending queue connection.
/**
Create a lockfile which contains the pid of the mysqld instance started
and pathname as name of unix socket pathname appended with .lock
@retval False if lockfile creation is successful else true if lockfile
file could not be created.
*/
bool create_lockfile();
public:
/**
Constructor that takes pathname for unix socket to bind to
and backlog specifying the length of pending connection queue.
@param unix_sockname pointer to pathname for the created unix socket
to bind.
@param backlog specifying the length of pending connection queue.
*/
Unix_socket(const std::string *unix_sockname, uint backlog)
: m_unix_sockname(*unix_sockname), m_backlog(backlog) {}
/**
Set up a listener socket which is ready to listen for connection from
clients.
@retval valid socket if successful else MYSQL_INVALID_SOCKET on failure.
*/
MYSQL_SOCKET get_listener_socket() {
struct sockaddr_un UNIXaddr;
DBUG_PRINT("general", ("UNIX Socket is %s", m_unix_sockname.c_str()));
// Check path length, probably move to set unix port?
if (m_unix_sockname.length() > (sizeof(UNIXaddr.sun_path) - 1)) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_PATH_TOO_LONG,
(uint)sizeof(UNIXaddr.sun_path) - 1, m_unix_sockname.c_str());
return MYSQL_INVALID_SOCKET;
}
if (create_lockfile() ||
DBUG_EVALUATE_IF("simulate_create_socket_lockfile_error", true,
false)) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_FAIL);
return MYSQL_INVALID_SOCKET;
}
MYSQL_SOCKET listener_socket =
mysql_socket_socket(key_socket_unix, AF_UNIX, SOCK_STREAM, 0);
if (mysql_socket_getfd(listener_socket) < 0) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_NO_FD, strerror(errno));
return MYSQL_INVALID_SOCKET;
}
mysql_socket_set_thread_owner(listener_socket);
memset(&UNIXaddr, 0, sizeof(UNIXaddr));
UNIXaddr.sun_family = AF_UNIX;
my_stpcpy(UNIXaddr.sun_path, m_unix_sockname.c_str());
(void)unlink(m_unix_sockname.c_str());
// Set socket option SO_REUSEADDR
int option_enable = 1;
(void)mysql_socket_setsockopt(listener_socket, SOL_SOCKET, SO_REUSEADDR,
(char *)&option_enable,
sizeof(option_enable));
// bind
umask(0);
if (mysql_socket_bind(listener_socket,
reinterpret_cast<struct sockaddr *>(&UNIXaddr),
sizeof(UNIXaddr)) < 0) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_NO_BIND_NO_START, strerror(errno));
LogErr(ERROR_LEVEL, ER_CONN_UNIX_IS_THERE_ANOTHER_USING_SOCKET,
m_unix_sockname.c_str());
mysql_socket_close(listener_socket);
return MYSQL_INVALID_SOCKET;
}
umask(((~my_umask) & 0666));
// listen
if (mysql_socket_listen(listener_socket, (int)m_backlog) < 0)
LogErr(WARNING_LEVEL, ER_CONN_UNIX_LISTEN_FAILED, socket_errno);
// set sock fd non blocking.
#if !defined(NO_FCNTL_NONBLOCK)
(void)mysql_sock_set_nonblocking(listener_socket);
#endif
return listener_socket;
}
};
bool Unix_socket::create_lockfile() {
int fd;
char buffer[8];
pid_t cur_pid = getpid();
std::string lock_filename = m_unix_sockname + ".lock";
static_assert(sizeof(pid_t) == 4, "");
int retries = 3;
while (true) {
if (!retries--) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_GIVING_UP,
lock_filename.c_str());
return true;
}
fd = open(lock_filename.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
if (fd >= 0) break;
if (errno != EEXIST) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_CREATE,
lock_filename.c_str());
return true;
}
fd = open(lock_filename.c_str(), O_RDONLY, 0600);
if (fd < 0) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_OPEN,
lock_filename.c_str());
return true;
}
ssize_t len;
if ((len = read(fd, buffer, sizeof(buffer) - 1)) < 0) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_READ,
lock_filename.c_str());
close(fd);
return true;
}
close(fd);
if (len == 0) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_EMPTY, lock_filename.c_str());
return true;
}
buffer[len] = '\0';
pid_t parent_pid = getppid();
pid_t read_pid = atoi(buffer);
if (read_pid <= 0) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_PIDLESS,
lock_filename.c_str());
return true;
}
if (read_pid != cur_pid && read_pid != parent_pid) {
if (kill(read_pid, 0) == 0) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_PID_CLAIMED_SOCKET_FILE,
static_cast<int>(read_pid));
return true;
}
}
/*
Unlink the lock file as it is not associated with any process and
retry.
*/
if (unlink(lock_filename.c_str()) < 0) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_DELETE,
lock_filename.c_str(), errno);
return true;
}
}
snprintf(buffer, sizeof(buffer), "%d\n", static_cast<int>(cur_pid));
if (write(fd, buffer, strlen(buffer)) !=
static_cast<signed>(strlen(buffer))) {
close(fd);
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_WRITE,
lock_filename.c_str(), errno);
if (unlink(lock_filename.c_str()) == -1)
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_DELETE,
lock_filename.c_str(), errno);
return true;
}
if (fsync(fd) != 0) {
close(fd);
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_SYNC, lock_filename.c_str(),
errno);
if (unlink(lock_filename.c_str()) == -1)
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_DELETE,
lock_filename.c_str(), errno);
return true;
}
if (close(fd) != 0) {
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_CLOSE,
lock_filename.c_str(), errno);
if (unlink(lock_filename.c_str()) == -1)
LogErr(ERROR_LEVEL, ER_CONN_UNIX_LOCK_FILE_CANT_DELETE,
lock_filename.c_str(), errno);
return true;
}
return false;
}
#endif // HAVE_SYS_UN_H
///////////////////////////////////////////////////////////////////////////
// Mysqld_socket_listener implementation
///////////////////////////////////////////////////////////////////////////
Mysqld_socket_listener::Mysqld_socket_listener(
const std::list<Bind_address_info> &bind_addresses, uint tcp_port,
const Bind_address_info &admin_bind_addr, uint admin_tcp_port,
bool use_separate_thread_for_admin, uint backlog, uint port_timeout,
std::string unix_sockname)
: m_bind_addresses(bind_addresses),
m_admin_bind_address(admin_bind_addr),
m_tcp_port(tcp_port),
m_admin_tcp_port(admin_tcp_port),
m_use_separate_thread_for_admin(use_separate_thread_for_admin),
m_backlog(backlog),
m_port_timeout(port_timeout),
m_unix_sockname(unix_sockname),
m_unlink_sockname(false),
m_admin_interface_listen_socket(mysql_socket_invalid()) {
#ifdef HAVE_LIBWRAP
/*
Set up syslog parameters on behalf of the TCP-wrappers.
The loadable component that logs server errors to syslog
may re-open it with user-defined attributes (logging of
PIDS / ident) later, but we establish a sensible baseline
here in case that log-sink is not used. Note that the
wrapper is hard-coded to use LOG_AUTH in the syslog()
call below, which lets the wrapper log to a different
facility than the rest of the server (the facility of
which defaults to LOG_DAEMON and is user-configurable)
if desired.
*/
libwrap_name = my_progname + dirname_length(my_progname);
openlog(libwrap_name, LOG_PID, LOG_AUTH);
#endif /* HAVE_LIBWRAP */
}
void Mysqld_socket_listener::add_socket_to_listener(
MYSQL_SOCKET listen_socket) {
mysql_socket_set_thread_owner(listen_socket);
#ifdef HAVE_POLL
m_poll_info.m_fds.emplace_back(
pollfd{mysql_socket_getfd(listen_socket), POLLIN, 0});
m_poll_info.m_pfs_fds.push_back(listen_socket);
#else // HAVE_POLL
FD_SET(mysql_socket_getfd(listen_socket), &m_select_info.m_client_fds);
if ((uint)mysql_socket_getfd(listen_socket) >
m_select_info.m_max_used_connection)
m_select_info.m_max_used_connection = mysql_socket_getfd(listen_socket);
#endif // HAVE_POLL
}
void Mysqld_socket_listener::setup_connection_events(
const socket_vector_t &socket_vector) {
#ifdef HAVE_POLL
const socket_vector_t::size_type total_number_of_addresses_to_bind =
socket_vector.size();
m_poll_info.m_fds.reserve(total_number_of_addresses_to_bind);
m_poll_info.m_pfs_fds.reserve(total_number_of_addresses_to_bind);
#endif
for (const auto &socket_element : socket_vector)
add_socket_to_listener(socket_element.m_socket);
}
/**
Accept a new connection on a ready listening socket.
@param listen_sock Listening socket ready to accept a new connection
@param [out] connect_sock Socket corresponding to a new accepted connection
@return operation result
@retval true on error
@retval false on success
*/
static bool accept_connection(MYSQL_SOCKET listen_sock,
MYSQL_SOCKET *connect_sock) {
struct sockaddr_storage c_addr;
for (uint retry = 0; retry < MAX_ACCEPT_RETRY; retry++) {
socket_len_t length = sizeof(struct sockaddr_storage);
*connect_sock =
mysql_socket_accept(key_socket_client_connection, listen_sock,
(struct sockaddr *)(&c_addr), &length);
if (mysql_socket_getfd(*connect_sock) != INVALID_SOCKET ||
(socket_errno != SOCKET_EINTR && socket_errno != SOCKET_EAGAIN))
break;
}
if (mysql_socket_getfd(*connect_sock) == INVALID_SOCKET) {
/*
accept(2) failed on the listening port, after many retries.
There is not much details to report about the client,
increment the server global status variable.
*/
if ((connection_errors_accept++ & 255) == 0) { // This can happen often
#ifdef _WIN32
Socket_error_message_buf msg_buff;
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, socket_errno,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)msg_buff,
sizeof(msg_buff), NULL);
LogErr(ERROR_LEVEL, ER_CONN_SOCKET_ACCEPT_FAILED, msg_buff);
#else
LogErr(ERROR_LEVEL, ER_CONN_SOCKET_ACCEPT_FAILED, strerror(errno));
#endif
}
if (socket_errno == SOCKET_ENFILE || socket_errno == SOCKET_EMFILE)
sleep(1); // Give other threads some time
return true;
}
return false;
}
#ifdef HAVE_LIBWRAP
/**
Ask TCP wrapper whether an accepted connection is allowed.
@param connect_sock Socket corresponding to accepted connection
@return operation result
@retval true connection is prohibited by TCP wrapper's policy
@retval false connection is allowed by TCP wrapper's policy
*/
bool check_connection_refused_by_tcp_wrapper(MYSQL_SOCKET connect_sock) {
struct request_info req;
signal(SIGCHLD, SIG_DFL);
request_init(&req, RQ_DAEMON, libwrap_name, RQ_FILE,
mysql_socket_getfd(connect_sock), NULL);
fromhost(&req);
if (!hosts_access(&req)) {
/*
This may be stupid but refuse() includes an exit(0)
which we surely don't want...
clean_exit() - same stupid thing ...
We're using syslog() here instead of my_syslog()
as this lets us pass in a facility that may differ
from that used by the error logging component.
This is unproblematic as TCP-wrapper is unix specific,
anyway.
*/
syslog(LOG_AUTH | LOG_WARNING, "refused connect from %s",
eval_client(&req));
#ifdef HAVE_LIBWRAP_PROTOTYPES
// Some distros have patched tcpd.h to have proper prototypes
if (req.sink) (req.sink)(req.fd);
#else
// Some distros have not patched tcpd.h
if (req.sink) ((void (*)(int))req.sink)(req.fd);
#endif
/*
The connection was refused by TCP wrappers.
There are no details (by client IP) available to update the host_cache.
*/
mysql_socket_shutdown(connect_sock, SHUT_RDWR);
mysql_socket_close(connect_sock);
connection_errors_tcpwrap++;
return true;
}
return false;
}