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/* Copyright (c) 2018, 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/sd_notify.h"
#include "my_config.h"
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h> // connect
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h> // socket
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h> // AF_UNIX
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h> // write
#endif
#include <errno.h> // errno
#include <string.h> // strcpy
#include <mysqld_error.h> // error logging
#include "my_sys.h" // my_strerror
#include "mysql/components/services/log_builtins.h" // error logging
#include "scope_guard.h" // scope_guard
#include "sql/log.h" // error logging
namespace sysd {
/** File descriptor for the systemd notification socket file. */
int NotifyGlobals::socket = -1;
/** Stringstream for formatting notification messages. */
std::stringstream NotifyGlobals::fmt;
/**
Looks for the name of the socket file in the environment variable
NOTIFY_SOCKET. Connects NotifyGlobals::socket to it if present.
*/
void notify_connect() {
#ifndef _WIN32
const char *sockstr = getenv("NOTIFY_SOCKET");
if (sockstr == nullptr) {
#ifdef WITH_SYSTEMD_DEBUG
LogErr(WARNING_LEVEL, ER_SYSTEMD_NOTIFY_DEBUG,
"NOTIFY_SOCKET not set in environment. sd_notify messages "
"will not be sent!",
"");
#endif /* WITH_SYSTEMD_DEBUG */
return;
}
size_t sockstrlen = strlen(sockstr);
size_t sunpathlen = sizeof(sockaddr_un::sun_path) - 1;
if (sockstrlen > sunpathlen) {
LogErr(SYSTEM_LEVEL, ER_SYSTEMD_NOTIFY_PATH_TOO_LONG, sockstr, sockstrlen,
sunpathlen);
return;
}
NotifyGlobals::socket = socket(AF_UNIX, SOCK_DGRAM, 0);
sockaddr_un addr;
socklen_t addrlen;
memset(&addr, 0, sizeof(sockaddr_un));
addr.sun_family = AF_UNIX;
if (sockstr[0] != '@') {
strcpy(addr.sun_path, sockstr);
addrlen = offsetof(struct sockaddr_un, sun_path) + sockstrlen + 1;
} else { // Abstract namespace socket
addr.sun_path[0] = '\0';
strncpy(&addr.sun_path[1], sockstr + 1, strlen(sockstr) - 1);
addrlen = offsetof(struct sockaddr_un, sun_path) + sockstrlen;
}
int ret = -1;
do {
ret = connect(NotifyGlobals::socket,
reinterpret_cast<const sockaddr *>(&addr), addrlen);
} while (ret == -1 && errno == EINTR);
if (ret == -1) {
char errbuf[512];
LogErr(WARNING_LEVEL, ER_SYSTEMD_NOTIFY_CONNECT_FAILED, sockstr,
my_strerror(errbuf, sizeof(errbuf) - 1, errno));
NotifyGlobals::socket = -1;
}
#endif /* not defined _WIN32 */
}
#ifndef _WIN32
/**
Recursion terminator overload for varargs template function. Creates
a string from the current content of NotifyGlobals::fmt and sends
string to notification socket.
*/
void notify() {
std::string note = NotifyGlobals::fmt.str();
const char *src = note.c_str();
const char *end = src + note.size();
ssize_t status = -1;
auto sg = create_scope_guard([&]() {
NotifyGlobals::fmt.str(""); // clear the fmt buffer for new notification
});
#ifdef WITH_SYSTEMD_DEBUG
if (NotifyGlobals::socket == -1) {
LogErr(WARNING_LEVEL, ER_SYSTEMD_NOTIFY_DEBUG,
"Invalid systemd notify socket, cannot send: ", note.c_str());
return;
}
LogErr(INFORMATION_LEVEL, ER_SYSTEMD_NOTIFY_DEBUG,
"Send to systemd notify socket: ", note.c_str());
#endif /* WITH_SYSTEMD_DEBUG */
while (true) {
size_t remaining = end - src;
status = write(NotifyGlobals::socket, src, remaining);
if (status == -1) {
if (errno == EINTR) {
continue;
}
break;
}
size_t written = status;
if (written == remaining) {
break;
}
src += written;
}
if (status == -1) {
char errbuf[512];
LogErr(WARNING_LEVEL, ER_SYSTEMD_NOTIFY_WRITE_FAILED, note.c_str(),
my_strerror(errbuf, sizeof(errbuf) - 1, errno));
}
}
#endif /* not defined _WIN32 */
} // namespace sysd
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