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MaxScale/server/core/gateway.cc
Esa Korhonen 3321a591ef MXS-2271 Move some monitor management functions to an internal class 
The class MonitorManager contains monitor-related functions that should not
be called from modules. MonitorManager can access private fields and methods
of the monitor.
2019-01-22 10:31:06 +02:00

3403 lines
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/*
* Copyright (c) 2016 MariaDB Corporation Ab
*
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
*
* Change Date: 2022-01-01
*
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2 or later of the General
* Public License.
*/
/**
* @file gateway.c - The entry point of MaxScale
*/
#include <maxscale/cdefs.h>
#ifdef HAVE_GLIBC
#include <execinfo.h>
#endif
#include <ftw.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <unistd.h>
#include <getopt.h>
#ifdef HAVE_SYSTEMD
#include <systemd/sd-daemon.h>
#endif
#include <set>
#include <map>
#include <fstream>
#include <ini.h>
#include <openssl/opensslconf.h>
#include <pwd.h>
#include <sys/file.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <maxbase/maxbase.hh>
#include <maxbase/stacktrace.hh>
#include <maxsql/mariadb.hh>
#include <maxscale/alloc.h>
#include <maxscale/adminusers.h>
#include <maxscale/dcb.hh>
#include <maxscale/housekeeper.h>
#include <maxscale/mainworker.hh>
#include <maxscale/maxscale.h>
#include <maxscale/mysql_utils.hh>
#include <maxscale/paths.h>
#include <maxscale/query_classifier.hh>
#include <maxscale/server.hh>
#include <maxscale/sqlite3.h>
#include <maxscale/session.hh>
#include <maxscale/utils.h>
#include <maxscale/version.h>
#include <maxscale/random.h>
#include <maxscale/routingworker.hh>
#include "internal/admin.hh"
#include "internal/config.hh"
#include "internal/maxscale.hh"
#include "internal/modules.hh"
#include "internal/monitor.hh"
#include "internal/poll.hh"
#include "internal/service.hh"
using namespace maxscale;
#define STRING_BUFFER_SIZE 1024
#define PIDFD_CLOSED -1
/** for procname */
#if !defined (_GNU_SOURCE)
# define _GNU_SOURCE
#endif
#if defined (OPENSSL_THREADS)
#define HAVE_OPENSSL_THREADS 1
#else
#define HAVE_OPENSSL_THREADS 0
#endif
extern char* program_invocation_name;
extern char* program_invocation_short_name;
/* The data directory we created for this gateway instance */
static char datadir[PATH_MAX + 1] = "";
static bool datadir_defined = false; /*< If the datadir was already set */
/* The data directory we created for this gateway instance */
static char pidfile[PATH_MAX + 1] = "";
static int pidfd = PIDFD_CLOSED;
/* Map containing paths to directory locks with their fds */
static std::map<std::string, int> directory_locks;
/**
* If MaxScale is started to run in daemon process the value is true.
*/
static bool daemon_mode = true;
static const char* maxscale_commit = MAXSCALE_COMMIT;
const char* progname = NULL;
#ifdef HAVE_GLIBC
// getopt_long is a GNU extension
static struct option long_options[] =
{
{"config-check", no_argument, 0, 'c'},
{"export-config", required_argument, 0, 'e'},
{"daemon", no_argument, 0, 'n'},
{"nodaemon", no_argument, 0, 'd'},
{"config", required_argument, 0, 'f'},
{"log", required_argument, 0, 'l'},
{"logdir", required_argument, 0, 'L'},
{"cachedir", required_argument, 0, 'A'},
{"libdir", required_argument, 0, 'B'},
{"configdir", required_argument, 0, 'C'},
{"datadir", required_argument, 0, 'D'},
{"execdir", required_argument, 0, 'E'},
{"persistdir", required_argument, 0, 'F'},
{"module_configdir", required_argument, 0, 'M'},
{"language", required_argument, 0, 'N'},
{"piddir", required_argument, 0, 'P'},
{"basedir", required_argument, 0, 'R'},
{"runtimedir", required_argument, 0, 'r'},
{"user", required_argument, 0, 'U'},
{"syslog", required_argument, 0, 's'},
{"maxlog", required_argument, 0, 'S'},
{"log_augmentation", required_argument, 0, 'G'},
{"version", no_argument, 0, 'v'},
{"version-full", no_argument, 0, 'V'},
{"help", no_argument, 0, '?'},
{"connector_plugindir", required_argument, 0, 'H'},
{"passive", no_argument, 0, 'p'},
{"debug", required_argument, 0, 'g'},
{0, 0, 0, 0 }
};
#endif
static bool syslog_configured = false;
static bool maxlog_configured = false;
static bool log_to_shm_configured = false;
static volatile sig_atomic_t last_signal = 0;
static bool unload_modules_at_exit = true;
static std::string redirect_output_to;
static int cnf_preparser(void* data, const char* section, const char* name, const char* value);
static int write_pid_file(); /* write MaxScale pidfile */
static bool lock_dir(const std::string& path);
static bool lock_directories();
static void unlock_directories();
static void unlink_pidfile(void); /* remove pidfile */
static void unlock_pidfile();
static bool file_write_header(FILE* outfile);
static bool file_write_footer(FILE* outfile);
static void write_footer(void);
static int ntfw_cb(const char*, const struct stat*, int, struct FTW*);
static bool is_file_and_readable(const char* absolute_pathname);
static bool path_is_readable(const char* absolute_pathname);
static bool path_is_writable(const char* absolute_pathname);
bool handle_path_arg(char** dest, const char* path, const char* arg, bool rd, bool wr);
static bool handle_debug_args(char* args);
static void set_log_augmentation(const char* value);
static void usage(void);
static char* get_expanded_pathname(char** abs_path,
const char* input_path,
const char* fname);
static void print_log_n_stderr(bool do_log,
bool do_stderr,
const char* logstr,
const char* fprstr,
int eno);
static bool resolve_maxscale_conf_fname(char** cnf_full_path,
const char* home_dir,
char* cnf_file_arg);
static char* check_dir_access(char* dirname, bool, bool);
static int set_user(const char* user);
bool pid_file_exists();
void write_child_exit_code(int fd, int code);
static bool change_cwd();
static void log_exit_status();
static bool daemonize();
static bool sniff_configuration(const char* filepath);
static bool modules_process_init();
static void modules_process_finish();
static void disable_module_unloading(const char* arg);
static void enable_module_unloading(const char* arg);
static void enable_statement_logging(const char* arg);
static void disable_statement_logging(const char* arg);
static void redirect_output_to_file(const char* arg);
static bool user_is_acceptable(const char* specified_user);
static bool init_sqlite3();
struct DEBUG_ARGUMENT
{
const char* name; /**< The name of the debug argument */
void (* action)(const char* arg);/**< The function implementing the argument */
const char* description; /**< Help text */
};
#define SPACER " "
const DEBUG_ARGUMENT debug_arguments[] =
{
{
"disable-module-unloading", disable_module_unloading,
"disable module unloading at exit. Will produce better\n"
SPACER "Valgrind leak reports if leaked memory was allocated in\n"
SPACER "a shared library"
},
{
"enable-module-unloading", enable_module_unloading,
"cancels disable-module-unloading"
},
{
"redirect-output-to-file", redirect_output_to_file,
"redirect stdout and stderr to the file given as an argument"
},
{
"enable-statement-logging", enable_statement_logging,
"enable the logging of monitor and authenticator SQL statements sent by MaxScale to the servers"
},
{
"disable-statement-logging", disable_statement_logging,
"disable the logging of monitor and authenticator SQL statements sent by MaxScale to the servers"
},
{NULL, NULL, NULL}
};
#ifndef OPENSSL_1_1
/** SSL multi-threading functions and structures */
static pthread_mutex_t* ssl_locks;
static void ssl_locking_function(int mode, int n, const char* file, int line)
{
if (mode & CRYPTO_LOCK)
{
pthread_mutex_lock(&ssl_locks[n]);
}
else
{
pthread_mutex_unlock(&ssl_locks[n]);
}
}
/**
* OpenSSL requires this struct to be defined in order to use dynamic locks
*/
struct CRYPTO_dynlock_value
{
pthread_mutex_t lock;
};
/**
* Create a dynamic OpenSSL lock. The dynamic lock is just a wrapper structure
* around a SPINLOCK structure.
* @param file File name
* @param line Line number
* @return Pointer to new lock or NULL of an error occurred
*/
static struct CRYPTO_dynlock_value* ssl_create_dynlock(const char* file, int line)
{
struct CRYPTO_dynlock_value* lock =
(struct CRYPTO_dynlock_value*) MXS_MALLOC(sizeof(struct CRYPTO_dynlock_value));
if (lock)
{
pthread_mutex_init(&lock->lock, NULL);
}
return lock;
}
/**
* Lock a dynamic lock for OpenSSL.
* @param mode
* @param n pointer to lock
* @param file File name
* @param line Line number
*/
static void ssl_lock_dynlock(int mode, struct CRYPTO_dynlock_value* n, const char* file, int line)
{
if (mode & CRYPTO_LOCK)
{
pthread_mutex_lock(&n->lock);
}
else
{
pthread_mutex_unlock(&n->lock);
}
}
/**
* Free a dynamic OpenSSL lock.
* @param n Lock to free
* @param file File name
* @param line Line number
*/
static void ssl_free_dynlock(struct CRYPTO_dynlock_value* n, const char* file, int line)
{
MXS_FREE(n);
}
#ifdef OPENSSL_1_0
/**
* The thread ID callback function for OpenSSL dynamic locks.
* @param id Id to modify
*/
static void maxscale_ssl_id(CRYPTO_THREADID* id)
{
CRYPTO_THREADID_set_numeric(id, pthread_self());
}
#endif
#endif
/**
* Handler for SIGHUP signal.
*/
static void sighup_handler(int i)
{
// Legacy configuration reload handler
}
/**
* Handler for SIGUSR1 signal. A SIGUSR1 signal will cause
* maxscale to rotate all log files.
*/
static void sigusr1_handler(int i)
{
MXS_NOTICE("Log file flush following reception of SIGUSR1\n");
mxs_log_rotate();
}
static const char shutdown_msg[] = "\n\nShutting down MaxScale\n\n";
static const char patience_msg[] =
"\n"
"Patience is a virtue...\n"
"Shutdown in progress, but one more Ctrl-C or SIGTERM and MaxScale goes down,\n"
"no questions asked.\n";
static void sigterm_handler(int i)
{
last_signal = i;
int n_shutdowns = maxscale_shutdown();
if (n_shutdowns == 1)
{
if (!daemon_mode)
{
if (write(STDERR_FILENO, shutdown_msg, sizeof(shutdown_msg) - 1) == -1)
{
printf("Failed to write shutdown message!\n");
}
}
}
else
{
exit(EXIT_FAILURE);
}
}
static void sigint_handler(int i)
{
last_signal = i;
int n_shutdowns = maxscale_shutdown();
if (n_shutdowns == 1)
{
if (!daemon_mode)
{
if (write(STDERR_FILENO, shutdown_msg, sizeof(shutdown_msg) - 1) == -1)
{
printf("Failed to write shutdown message!\n");
}
}
}
else if (n_shutdowns == 2)
{
if (!daemon_mode)
{
if (write(STDERR_FILENO, patience_msg, sizeof(patience_msg) - 1) == -1)
{
printf("Failed to write shutdown message!\n");
}
}
}
else
{
exit(EXIT_FAILURE);
}
}
volatile sig_atomic_t fatal_handling = 0;
static int signal_set(int sig, void (* handler)(int));
static void sigfatal_handler(int i)
{
// The same signal being handled *now* can occur in another thread (and is often likely).
// By setting the default handler here we will always get a core, but not necessarily
// the backtrace into the log file. This should be overhauled to proper signal handling
// (MXS-599).
signal_set(i, SIG_DFL);
MXS_CONFIG* cnf = config_get_global_options();
fprintf(stderr,
"Fatal: MaxScale " MAXSCALE_VERSION " received fatal signal %d. "
"Attempting backtrace.\n",
i);
fprintf(stderr,
"Commit ID: %s System name: %s Release string: %s\n\n",
maxscale_commit,
cnf->sysname,
cnf->release_string);
MXS_ALERT("Fatal: MaxScale " MAXSCALE_VERSION " received fatal signal %d. "
"Attempting backtrace.",
i);
MXS_ALERT("Commit ID: %s System name: %s Release string: %s",
maxscale_commit,
cnf->sysname,
cnf->release_string);
auto cb = [](const char* symbol, const char* cmd) {
MXS_ALERT(" %s: %s", symbol, cmd);
};
mxb::dump_stacktrace(cb);
/* re-raise signal to enforce core dump */
fprintf(stderr, "\n\nWriting core dump\n");
raise(i);
}
/**
* @node Wraps sigaction calls
*
* Parameters:
* @param sig Signal to set
* @param void Handler function for signal *
*
* @return 0 in success, 1 otherwise
*
*
* @details (write detailed description here)
*
*/
static int signal_set(int sig, void (* handler)(int))
{
int rc = 0;
struct sigaction sigact = {};
sigact.sa_handler = handler;
int err;
do
{
errno = 0;
err = sigaction(sig, &sigact, NULL);
}
while (errno == EINTR);
if (err < 0)
{
MXS_ERROR("Failed call sigaction() in %s due to %d, %s.",
program_invocation_short_name,
errno,
mxs_strerror(errno));
rc = 1;
}
return rc;
}
/**
* @brief Create the data directory for this process
*
* This will prevent conflicts when multiple MaxScale instances are run on the
* same machine.
* @param base Base datadir path
* @param datadir The result where the process specific datadir is stored
* @return True if creation was successful and false on error
*/
static bool create_datadir(const char* base, char* datadir)
{
bool created = false;
int len = 0;
if ((len = snprintf(datadir, PATH_MAX, "%s", base)) < PATH_MAX
&& (mkdir(datadir, 0777) == 0 || errno == EEXIST))
{
if ((len = snprintf(datadir, PATH_MAX, "%s/data%d", base, getpid())) < PATH_MAX)
{
if ((mkdir(datadir, 0777) == 0) || (errno == EEXIST))
{
created = true;
}
else
{
MXS_ERROR("Cannot create data directory '%s': %d %s\n",
datadir,
errno,
mxs_strerror(errno));
}
}
}
else
{
if (len < PATH_MAX)
{
fprintf(stderr,
"Error: Cannot create data directory '%s': %d %s\n",
datadir,
errno,
mxs_strerror(errno));
}
else
{
MXS_ERROR("Data directory pathname exceeds the maximum allowed pathname "
"length: %s/data%d.",
base,
getpid());
}
}
return created;
}
/**
* Cleanup the temporary data directory we created for the gateway
*/
int ntfw_cb(const char* filename,
const struct stat* filestat,
int fileflags,
struct FTW* pfwt)
{
int rc = 0;
int datadir_len = strlen(get_datadir());
std::string filename_string(filename + datadir_len);
if (strncmp(filename_string.c_str(), "/data", 5) == 0)
{
rc = remove(filename);
if (rc != 0)
{
int eno = errno;
errno = 0;
MXS_ERROR("Failed to remove the data directory %s of MaxScale due to %d, %s.",
filename_string.c_str(),
eno,
mxs_strerror(eno));
}
}
return rc;
}
/**
* @brief Clean up the data directory
*
* This removes the process specific datadir which is currently only used by
* the embedded library. In the future this directory could contain other
* temporary files and relocating this to to, for example, /tmp/ could make sense.
*/
void cleanup_process_datadir()
{
int depth = 1;
int flags = FTW_CHDIR | FTW_DEPTH | FTW_MOUNT;
const char* proc_datadir = get_process_datadir();
if (strcmp(proc_datadir, get_datadir()) != 0 && access(proc_datadir, F_OK) == 0)
{
nftw(proc_datadir, ntfw_cb, depth, flags);
}
}
void cleanup_old_process_datadirs()
{
int depth = 1;
int flags = FTW_CHDIR | FTW_DEPTH | FTW_MOUNT;
nftw(get_datadir(), ntfw_cb, depth, flags);
}
static void write_footer(void)
{
file_write_footer(stdout);
}
static bool file_write_footer(FILE* outfile)
{
bool succp = false;
size_t len1;
const char* header_buf1;
header_buf1 = "------------------------------------------------------"
"\n\n";
len1 = strlen(header_buf1);
fwrite((void*)header_buf1, len1, 1, outfile);
succp = true;
return succp;
}
// Documentation says 26 bytes is enough, but 32 is a nice round number.
#define ASCTIME_BUF_LEN 32
static bool file_write_header(FILE* outfile)
{
bool succp = false;
size_t len1;
size_t len2;
size_t len3;
const char* header_buf1;
char header_buf2[ASCTIME_BUF_LEN];
const char* header_buf3;
time_t t;
struct tm tm;
#if defined (LAPTOP_TEST)
struct timespec ts1;
ts1.tv_sec = 0;
ts1.tv_nsec = DISKWRITE_LATENCY * 1000000;
#endif
#if !defined (SS_DEBUG)
return true;
#endif
t = time(NULL);
localtime_r(&t, &tm);
header_buf1 = "\n\nMariaDB Corporation MaxScale " MAXSCALE_VERSION "\t";
asctime_r(&tm, header_buf2);
header_buf3 = "------------------------------------------------------\n";
len1 = strlen(header_buf1);
len2 = strlen(header_buf2);
len3 = strlen(header_buf3);
#if defined (LAPTOP_TEST)
nanosleep(&ts1, NULL);
#else
fwrite((void*)header_buf1, len1, 1, outfile);
fwrite((void*)header_buf2, len2, 1, outfile);
fwrite((void*)header_buf3, len3, 1, outfile);
#endif
succp = true;
return succp;
}
static bool resolve_maxscale_conf_fname(char** cnf_full_path,
const char* home_dir,
char* cnf_file_arg)
{
if (cnf_file_arg)
{
*cnf_full_path = (char*)MXS_MALLOC(PATH_MAX + 1);
MXS_ABORT_IF_NULL(*cnf_full_path);
if (!realpath(cnf_file_arg, *cnf_full_path))
{
const char* logstr = "Failed to open read access to configuration file.";
int eno = errno;
print_log_n_stderr(true, true, logstr, logstr, eno);
MXS_FREE(*cnf_full_path);
*cnf_full_path = NULL;
}
}
else /*< default config file name is used */
{
*cnf_full_path = get_expanded_pathname(NULL, home_dir, default_cnf_fname);
}
return *cnf_full_path && is_file_and_readable(*cnf_full_path);
}
/**
* Check read and write accessibility to a directory.
* @param dirname directory to be checked
*
* @return NULL if directory can be read and written, an error message if either
* read or write is not permitted.
*/
static char* check_dir_access(char* dirname, bool rd, bool wr)
{
char errbuf[PATH_MAX * 2];
char* errstr = NULL;
if (dirname == NULL)
{
errstr = MXS_STRDUP_A("Directory argument is NULL");
goto retblock;
}
if (access(dirname, F_OK) != 0)
{
snprintf(errbuf, PATH_MAX * 2 - 1, "Can't access '%s'.", dirname);
errbuf[PATH_MAX * 2 - 1] = '\0';
errstr = MXS_STRDUP_A(errbuf);
goto retblock;
}
if (rd && !path_is_readable(dirname))
{
snprintf(errbuf,
PATH_MAX * 2 - 1,
"MaxScale doesn't have read permission "
"to '%s'.",
dirname);
errbuf[PATH_MAX * 2 - 1] = '\0';
errstr = MXS_STRDUP_A(errbuf);
goto retblock;
}
if (wr && !path_is_writable(dirname))
{
snprintf(errbuf,
PATH_MAX * 2 - 1,
"MaxScale doesn't have write permission "
"to '%s'.",
dirname);
errbuf[PATH_MAX * 2 - 1] = '\0';
errstr = MXS_STRDUP_A(errbuf);
goto retblock;
}
retblock:
return errstr;
}
static bool init_log()
{
bool rval = false;
MXS_CONFIG* cnf = config_get_global_options();
if (!cnf->config_check && mkdir(get_logdir(), 0777) != 0 && errno != EEXIST)
{
fprintf(stderr,
"Error: Cannot create log directory '%s': %d, %s\n",
default_logdir,
errno,
strerror(errno));
}
else if (mxs_log_init(NULL, get_logdir(), cnf->log_target))
{
mxs_log_set_syslog_enabled(cnf->syslog);
mxs_log_set_maxlog_enabled(cnf->maxlog);
atexit(mxs_log_finish);
rval = true;
}
return rval;
}
/**
* @node Provides error printing for non-formatted error strings.
*
* @param do_log Specifies whether printing to log is enabled
*
* @param do_stderr Specifies whether printing to stderr is enabled
*
* @param logstr String to be printed to log
*
* @param fprstr String to be printed to stderr
*
* @param eno Errno, if it is set, zero, otherwise
*/
static void print_log_n_stderr(bool do_log, /*< is printing to log enabled */
bool do_stderr, /*< is printing to stderr enabled */
const char* logstr, /*< string to be printed to log */
const char* fprstr, /*< string to be printed to stderr */
int eno) /*< errno, if it is set, zero, otherwise */
{
if (do_log)
{
if (mxb_log_inited() || init_log())
{
MXS_ERROR("%s%s%s%s",
logstr,
eno == 0 ? "" : " (",
eno == 0 ? "" : mxs_strerror(eno),
eno == 0 ? "" : ")");
}
}
if (do_stderr)
{
fprintf(stderr,
"* Error: %s%s%s%s\n",
fprstr,
eno == 0 ? "" : " (",
eno == 0 ? "" : mxs_strerror(eno),
eno == 0 ? "" : ")");
}
}
/**
* Check that a path refers to a readable file.
*
* @param absolute_pathname The path to check.
* @return True if the path refers to a readable file. is readable
*/
static bool is_file_and_readable(const char* absolute_pathname)
{
bool rv = false;
struct stat info;
if (stat(absolute_pathname, &info) == 0)
{
if ((info.st_mode & S_IFMT) == S_IFREG)
{
// There is a race here as the file can be deleted and a directory
// created in its stead between the stat() call here and the access()
// call in file_is_readable().
rv = path_is_readable(absolute_pathname);
}
else
{
const char FORMAT[] = "'%s' does not refer to a regular file.";
char buff[sizeof(FORMAT) + strlen(absolute_pathname)];
snprintf(buff, sizeof(buff), FORMAT, absolute_pathname);
print_log_n_stderr(true, true, buff, buff, 0);
}
}
else
{
int eno = errno;
errno = 0;
const char FORMAT[] = "Could not access '%s'.";
char buff[sizeof(FORMAT) + strlen(absolute_pathname)];
snprintf(buff, sizeof(buff), FORMAT, absolute_pathname);
print_log_n_stderr(true, true, buff, buff, eno);
}
return rv;
}
/**
* Check if the file or directory is readable
* @param absolute_pathname Path of the file or directory to check
* @return True if file is readable
*/
static bool path_is_readable(const char* absolute_pathname)
{
bool succp = true;
if (access(absolute_pathname, R_OK) != 0)
{
int eno = errno;
errno = 0;
char buff[PATH_MAX + 100];
snprintf(buff, sizeof(buff), "Opening file '%s' for reading failed.", absolute_pathname);
print_log_n_stderr(true, true, buff, buff, eno);
succp = false;
}
return succp;
}
/**
* Check if the file or directory is writable
* @param absolute_pathname Path of the file or directory to check
* @return True if file is writable
*/
static bool path_is_writable(const char* absolute_pathname)
{
bool succp = true;
if (access(absolute_pathname, W_OK) != 0)
{
int eno = errno;
errno = 0;
char buff[PATH_MAX + 100];
snprintf(buff, sizeof(buff), "Opening file '%s' for writing failed.", absolute_pathname);
print_log_n_stderr(true, true, buff, buff, eno);
succp = false;
}
return succp;
}
/**
* @node Expand path expression and if fname is provided, concatenate
* it to path to for an absolute pathname. If fname is provided
* its readability is tested.
*
* Parameters:
* @param output_path memory address where expanded path is stored,
* if output_path != NULL
*
* @param relative_path path to be expanded
*
* @param fname file name to be concatenated to the path, may be NULL
*
* @return expanded path and if fname was NULL, absolute pathname of it.
* Both return value and *output_path are NULL in case of failure.
*
*
*/
static char* get_expanded_pathname(char** output_path,
const char* relative_path,
const char* fname)
{
char* cnf_file_buf = NULL;
char* expanded_path;
if (relative_path == NULL)
{
goto return_cnf_file_buf;
}
expanded_path = (char*)MXS_MALLOC(PATH_MAX);
if (!expanded_path)
{
if (output_path)
{
*output_path = NULL;
}
goto return_cnf_file_buf;
}
/*<
* Expand possible relative pathname to absolute path
*/
if (realpath(relative_path, expanded_path) == NULL)
{
int eno = errno;
errno = 0;
char buff[PATH_MAX + 100];
snprintf(buff, sizeof(buff), "Failed to read the directory '%s'.", relative_path);
print_log_n_stderr(true, true, buff, buff, eno);
MXS_FREE(expanded_path);
if (output_path)
{
*output_path = NULL;
}
goto return_cnf_file_buf;
}
if (fname != NULL)
{
/*<
* Concatenate an absolute filename and test its existence and
* readability.
*/
size_t pathlen = strnlen(expanded_path, PATH_MAX)
+ 1 + strnlen(fname, PATH_MAX) + 1;
cnf_file_buf = (char*)MXS_MALLOC(pathlen);
if (cnf_file_buf == NULL)
{
MXS_FREE(expanded_path);
expanded_path = NULL;
goto return_cnf_file_buf;
}
snprintf(cnf_file_buf, pathlen, "%s/%s", expanded_path, fname);
if (!path_is_readable(cnf_file_buf))
{
MXS_FREE(expanded_path);
MXS_FREE(cnf_file_buf);
expanded_path = NULL;
cnf_file_buf = NULL;
goto return_cnf_file_buf;
}
}
else
{
/*<
* If only directory was provided, check that it is
* readable.
*/
if (!path_is_readable(expanded_path))
{
MXS_FREE(expanded_path);
expanded_path = NULL;
goto return_cnf_file_buf;
}
}
if (output_path == NULL)
{
MXS_FREE(expanded_path);
}
else
{
*output_path = expanded_path;
}
return_cnf_file_buf:
return cnf_file_buf;
}
static void usage(void)
{
fprintf(stderr,
"\nUsage : %s [OPTION]...\n\n"
" -c, --config-check validate configuration file and exit\n"
" -e, --export-config=FILE export configuration to a single file\n"
" -d, --nodaemon enable running in terminal process\n"
" -f, --config=FILE relative or absolute pathname of config file\n"
" -l, --log=[file|stdout] log to file or stdout\n"
" (default: file)\n"
" -L, --logdir=PATH path to log file directory\n"
" -A, --cachedir=PATH path to cache directory\n"
" -B, --libdir=PATH path to module directory\n"
" -C, --configdir=PATH path to configuration file directory\n"
" -D, --datadir=PATH path to data directory,\n"
" stores internal MaxScale data\n"
" -E, --execdir=PATH path to the maxscale and other executable files\n"
" -F, --persistdir=PATH path to persisted configuration directory\n"
" -M, --module_configdir=PATH path to module configuration directory\n"
" -H, --connector_plugindir=PATH\n"
" path to MariaDB Connector-C plugin directory\n"
" -N, --language=PATH path to errmsg.sys file\n"
" -P, --piddir=PATH path to PID file directory\n"
" -R, --basedir=PATH base path for all other paths\n"
" -r --runtimedir=PATH base path for all other paths expect binaries\n"
" -U, --user=USER user ID and group ID of specified user are used to\n"
" run MaxScale\n"
" -s, --syslog=[yes|no] log messages to syslog (default:yes)\n"
" -S, --maxlog=[yes|no] log messages to MaxScale log (default: yes)\n"
" -G, --log_augmentation=0|1 augment messages with the name of the function\n"
" where the message was logged (default: 0)\n"
" -p, --passive start MaxScale as a passive standby\n"
" -g, --debug=arg1,arg2,... enable or disable debug features. Supported arguments:\n",
progname);
for (int i = 0; debug_arguments[i].action != NULL; i++)
{
fprintf(stderr,
" %-25s %s\n",
debug_arguments[i].name,
debug_arguments[i].description);
}
fprintf(stderr,
" -v, --version print version info and exit\n"
" -V, --version-full print full version info and exit\n"
" -?, --help show this help\n"
"\n"
"Defaults paths:\n"
" config file : %s/%s\n"
" configdir : %s\n"
" logdir : %s\n"
" cachedir : %s\n"
" libdir : %s\n"
" datadir : %s\n"
" execdir : %s\n"
" language : %s\n"
" piddir : %s\n"
" persistdir : %s\n"
" module configdir : %s\n"
" connector plugins : %s\n"
"\n"
"If '--basedir' is provided then all other paths, including the default\n"
"configuration file path, are defined relative to that. As an example,\n"
"if '--basedir /path/maxscale' is specified, then, for instance, the log\n"
"dir will be '/path/maxscale/var/log/maxscale', the config dir will be\n"
"'/path/maxscale/etc' and the default config file will be\n"
"'/path/maxscale/etc/maxscale.cnf'.\n\n"
"MaxScale documentation: https://mariadb.com/kb/en/mariadb-enterprise/mariadb-maxscale-21/ \n",
get_configdir(),
default_cnf_fname,
get_configdir(),
get_logdir(),
get_cachedir(),
get_libdir(),
get_datadir(),
get_execdir(),
get_langdir(),
get_piddir(),
get_config_persistdir(),
get_module_configdir(),
get_connector_plugindir());
}
/**
* Deletes a particular signal from a provided signal set.
*
* @param sigset The signal set to be manipulated.
* @param signum The signal to be deleted.
* @param signame The name of the signal.
*
* @return True, if the signal could be deleted from the set, false otherwise.
*/
static bool delete_signal(sigset_t* sigset, int signum, const char* signame)
{
int rc = sigdelset(sigset, signum);
if (rc != 0)
{
int e = errno;
errno = 0;
static const char FORMAT[] = "Failed to delete signal %s from the signal set of MaxScale. Exiting.";
char message[sizeof(FORMAT) + 16]; // Enough for any "SIG..." string.
sprintf(message, FORMAT, signame);
print_log_n_stderr(true, true, message, message, e);
}
return rc == 0;
}
/**
* Disables all signals.
*
* @return True, if all signals could be disabled, false otherwise.
*/
bool disable_signals(void)
{
sigset_t sigset;
if (sigfillset(&sigset) != 0)
{
int e = errno;
errno = 0;
static const char message[] = "Failed to initialize set the signal set for MaxScale. Exiting.";
print_log_n_stderr(true, true, message, message, e);
return false;
}
if (!delete_signal(&sigset, SIGHUP, "SIGHUP"))
{
return false;
}
if (!delete_signal(&sigset, SIGUSR1, "SIGUSR1"))
{
return false;
}
if (!delete_signal(&sigset, SIGTERM, "SIGTERM"))
{
return false;
}
if (!delete_signal(&sigset, SIGSEGV, "SIGSEGV"))
{
return false;
}
if (!delete_signal(&sigset, SIGABRT, "SIGABRT"))
{
return false;
}
if (!delete_signal(&sigset, SIGILL, "SIGILL"))
{
return false;
}
if (!delete_signal(&sigset, SIGFPE, "SIGFPE"))
{
return false;
}
if (!delete_signal(&sigset, SIGCHLD, "SIGCHLD"))
{
return false;
}
#ifdef SIGBUS
if (!delete_signal(&sigset, SIGBUS, "SIGBUS"))
{
return false;
}
#endif
if (sigprocmask(SIG_SETMASK, &sigset, NULL) != 0)
{
int e = errno;
errno = 0;
static const char message[] = "Failed to set the signal set for MaxScale. Exiting";
print_log_n_stderr(true, true, message, message, e);
return false;
}
return true;
}
/**
* Configures the handling of a particular signal.
*
* @param signum The signal number.
* @param signame The name of the signal.
* @param handler The handler function for the signal.
*
* @return True, if the signal could be configured, false otherwise.
*/
static bool configure_signal(int signum, const char* signame, void (* handler)(int))
{
int rc = signal_set(signum, handler);
if (rc != 0)
{
static const char FORMAT[] = "Failed to set signal handler for %s. Exiting.";
char message[sizeof(FORMAT) + 16]; // Enough for any "SIG..." string.
sprintf(message, FORMAT, signame);
print_log_n_stderr(true, true, message, message, 0);
}
return rc == 0;
}
/**
* Configures signal handling of MaxScale.
*
* @return True, if all signals could be configured, false otherwise.
*/
bool configure_signals(void)
{
if (!configure_signal(SIGHUP, "SIGHUP", sighup_handler))
{
return false;
}
if (!configure_signal(SIGUSR1, "SIGUSR1", sigusr1_handler))
{
return false;
}
if (!configure_signal(SIGTERM, "SIGTERM", sigterm_handler))
{
return false;
}
if (!configure_signal(SIGINT, "SIGINT", sigint_handler))
{
return false;
}
if (!configure_signal(SIGSEGV, "SIGSEGV", sigfatal_handler))
{
return false;
}
if (!configure_signal(SIGABRT, "SIGABRT", sigfatal_handler))
{
return false;
}
if (!configure_signal(SIGILL, "SIGILL", sigfatal_handler))
{
return false;
}
if (!configure_signal(SIGFPE, "SIGFPE", sigfatal_handler))
{
return false;
}
#ifdef SIGBUS
if (!configure_signal(SIGBUS, "SIGBUS", sigfatal_handler))
{
return false;
}
#endif
return true;
}
bool set_runtime_dirs(const char* basedir)
{
bool rv = true;
char* path;
if (rv && (rv = handle_path_arg(&path, basedir, "var/" MXS_DEFAULT_LOG_SUBPATH, true, false)))
{
set_logdir(path);
}
if (rv && (rv = handle_path_arg(&path, basedir, "var/" MXS_DEFAULT_CACHE_SUBPATH, true, true)))
{
set_cachedir(path);
}
if (rv && (rv = handle_path_arg(&path, basedir, MXS_DEFAULT_CONFIG_SUBPATH, true, false)))
{
set_configdir(path);
}
if (rv && (rv = handle_path_arg(&path, basedir, MXS_DEFAULT_MODULE_CONFIG_SUBPATH, true, false)))
{
set_module_configdir(path);
}
if (rv && (rv = handle_path_arg(&path, basedir, "var/" MXS_DEFAULT_DATA_SUBPATH, true, false)))
{
set_datadir(path);
}
if (rv && (rv = handle_path_arg(&path, basedir, "var/" MXS_DEFAULT_LANG_SUBPATH, true, false)))
{
set_langdir(path);
}
if (rv && (rv = handle_path_arg(&path, basedir, "var/" MXS_DEFAULT_PID_SUBPATH, true, true)))
{
set_piddir(path);
}
if (rv && (rv = handle_path_arg(&path,
basedir,
"var/" MXS_DEFAULT_DATA_SUBPATH "/"
MXS_DEFAULT_CONFIG_PERSIST_SUBPATH,
true,
true)))
{
set_config_persistdir(path);
}
if (rv && (rv = handle_path_arg(&path,
basedir,
"var/" MXS_DEFAULT_CONNECTOR_PLUGIN_SUBPATH,
true,
true)))
{
set_connector_plugindir(path);
}
return rv;
}
/**
* Set the directories of MaxScale relative to a basedir
*
* @param basedir The base directory relative to which the other are set.
*
* @return True if the directories could be set, false otherwise.
*/
bool set_dirs(const char* basedir)
{
bool rv = true;
char* path;
rv = set_runtime_dirs(basedir);
if (rv && (rv = handle_path_arg(&path, basedir, MXS_DEFAULT_LIB_SUBPATH, true, false)))
{
set_libdir(path);
}
if (rv && (rv = handle_path_arg(&path, basedir, MXS_DEFAULT_EXEC_SUBPATH, true, false)))
{
set_execdir(path);
}
return rv;
}
/**
* @mainpage
* The main entry point into MaxScale
*
* Logging and error printing
* ---
* What is printed to the terminal is something that the user can understand,
* and/or something what the user can do for. For example, fix configuration.
* More detailed messages are printed to error log, and optionally to trace
* and debug log.
*
* As soon as process switches to daemon process, stderr printing is stopped -
* except when it comes to command-line argument processing.
* This is not an obvious solution because stderr is often directed to somewhere,
* but currently this is the case.
*
* The configuration file is by default /etc/maxscale.cnf
* The name of configuration file and its location can also be specified with a
* command-line argument.
*
* @param argc The argument count
* @param argv The array of arguments themselves
* @return 0 if process exited normally, otherwise a non-zero value is returned
*/
int main(int argc, char** argv)
{
int rc = MAXSCALE_SHUTDOWN;
int n_services;
int eno = 0; /*< local variable for errno */
int opt;
int daemon_pipe[2] = {-1, -1};
bool parent_process;
int child_status;
char* cnf_file_path = NULL; /*< conf file, to be freed */
char* cnf_file_arg = NULL; /*< conf filename from cmd-line arg */
char* tmp_path;
int option_index;
MXS_CONFIG* cnf = config_get_global_options();
mxb_assert(cnf);
int* syslog_enabled = &cnf->syslog; /** Log to syslog */
int* maxlog_enabled = &cnf->maxlog; /** Log with MaxScale */
sigset_t sigpipe_mask;
sigset_t saved_mask;
int numlocks = 0;
bool pid_file_created = false;
mxb::Worker* worker;
const char* specified_user = NULL;
char export_cnf[PATH_MAX + 1] = "";
maxscale::MainWorker* main_worker = nullptr;
/**
* The following lambda function is executed as the first event on the main worker. This is what starts
* up the listeners for all services.
*
* Due to the fact that the main thread runs a worker thread we have to queue the starting
* of the listeners to happen after all workers have started. This allows worker messages to be used
* when listeners are being started.
*
* Once the main worker is dedicated to doing work other than handling traffic the code could be executed
* immediately after the worker thread have been started. This would make the startup logic clearer as
* the order of the events would be the way they appear to be.
*/
auto do_startup = [&]() {
if (!service_launch_all())
{
const char* logerr = "Failed to start all MaxScale services. Exiting.";
print_log_n_stderr(true, true, logerr, logerr, 0);
rc = MAXSCALE_NOSERVICES;
maxscale_shutdown();
}
else if (daemon_mode)
{
// Successful start, notify the parent process that it can exit.
write_child_exit_code(daemon_pipe[1], rc);
}
};
config_init();
config_set_global_defaults();
mxb_assert(cnf);
maxscale_reset_starttime();
sigemptyset(&sigpipe_mask);
sigaddset(&sigpipe_mask, SIGPIPE);
progname = *argv;
snprintf(datadir, PATH_MAX, "%s", default_datadir);
datadir[PATH_MAX] = '\0';
// Option string for getopt
const char accepted_opts[] = "dnce:f:g:l:vVs:S:?L:D:C:B:U:A:P:G:N:E:F:M:H:p";
#ifdef HAVE_GLIBC
while ((opt = getopt_long(argc,
argv,
accepted_opts,
long_options,
&option_index)) != -1)
#else
while ((opt = getopt(argc, argv, accepted_opts)) != -1)
#endif
{
bool succp = true;
switch (opt)
{
case 'n':
/*< Daemon mode, MaxScale forks and parent exits. */
daemon_mode = true;
break;
case 'd':
/*< Non-daemon mode, MaxScale does not fork. */
daemon_mode = false;
break;
case 'f':
/*<
* Simply copy the conf file argument. Expand or validate
* it when MaxScale home directory is resolved.
*/
if (optarg[0] != '-')
{
cnf_file_arg = strndup(optarg, PATH_MAX);
}
if (cnf_file_arg == NULL)
{
const char* logerr =
"Configuration file argument "
"identifier \'-f\' was specified but "
"the argument didn't specify\n a valid "
"configuration file or the argument "
"was missing.";
print_log_n_stderr(true, true, logerr, logerr, 0);
usage();
succp = false;
}
break;
case 'v':
rc = EXIT_SUCCESS;
printf("MaxScale %s\n", MAXSCALE_VERSION);
goto return_main;
case 'V':
rc = EXIT_SUCCESS;
printf("MaxScale %s - %s\n", MAXSCALE_VERSION, maxscale_commit);
// MAXSCALE_SOURCE is two values separated by a space, see CMakeLists.txt
if (strcmp(MAXSCALE_SOURCE, " ") != 0)
{
printf("Source: %s\n", MAXSCALE_SOURCE);
}
if (strcmp(MAXSCALE_CMAKE_FLAGS, "") != 0)
{
printf("CMake flags: %s\n", MAXSCALE_CMAKE_FLAGS);
}
if (strcmp(MAXSCALE_JENKINS_BUILD_TAG, "") != 0)
{
printf("Jenkins build: %s\n", MAXSCALE_JENKINS_BUILD_TAG);
}
goto return_main;
case 'l':
if (strncasecmp(optarg, "file", PATH_MAX) == 0)
{
cnf->log_target = MXB_LOG_TARGET_FS;
}
else if (strncasecmp(optarg, "shm", PATH_MAX) == 0)
{
// Removed in 2.3
cnf->log_target = MXB_LOG_TARGET_FS;
fprintf(stderr, "Warning: Use of `--log=shm` is deprecated. Data will be logged to file.\n");
}
else if (strncasecmp(optarg, "stdout", PATH_MAX) == 0)
{
cnf->log_target = MXB_LOG_TARGET_STDOUT;
}
else
{
const char* logerr =
"Configuration file argument "
"identifier \'-l\' was specified but "
"the argument didn't specify\n a valid "
"configuration file or the argument "
"was missing.";
print_log_n_stderr(true, true, logerr, logerr, 0);
usage();
succp = false;
}
break;
case 'L':
if (handle_path_arg(&tmp_path, optarg, NULL, true, false))
{
set_logdir(tmp_path);
}
else
{
succp = false;
}
break;
case 'N':
if (handle_path_arg(&tmp_path, optarg, NULL, true, false))
{
set_langdir(tmp_path);
}
else
{
succp = false;
}
break;
case 'P':
if (handle_path_arg(&tmp_path, optarg, NULL, true, true))
{
set_piddir(tmp_path);
}
else
{
succp = false;
}
break;
case 'D':
snprintf(datadir, PATH_MAX, "%s", optarg);
datadir[PATH_MAX] = '\0';
set_datadir(MXS_STRDUP_A(optarg));
datadir_defined = true;
break;
case 'C':
if (handle_path_arg(&tmp_path, optarg, NULL, true, false))
{
set_configdir(tmp_path);
}
else
{
succp = false;
}
break;
case 'B':
if (handle_path_arg(&tmp_path, optarg, NULL, true, false))
{
set_libdir(tmp_path);
}
else
{
succp = false;
}
break;
case 'A':
if (handle_path_arg(&tmp_path, optarg, NULL, true, true))
{
set_cachedir(tmp_path);
}
else
{
succp = false;
}
break;
case 'E':
if (handle_path_arg(&tmp_path, optarg, NULL, true, false))
{
set_execdir(tmp_path);
}
else
{
succp = false;
}
break;
case 'H':
if (handle_path_arg(&tmp_path, optarg, NULL, true, false))
{
set_connector_plugindir(tmp_path);
}
else
{
succp = false;
}
break;
case 'F':
if (handle_path_arg(&tmp_path, optarg, NULL, true, true))
{
set_config_persistdir(tmp_path);
}
else
{
succp = false;
}
break;
case 'M':
if (handle_path_arg(&tmp_path, optarg, NULL, true, true))
{
set_module_configdir(tmp_path);
}
else
{
succp = false;
}
break;
case 'R':
if (handle_path_arg(&tmp_path, optarg, NULL, true, false))
{
succp = set_dirs(tmp_path);
free(tmp_path);
}
else
{
succp = false;
}
break;
case 'r':
if (handle_path_arg(&tmp_path, optarg, NULL, true, false))
{
succp = set_runtime_dirs(tmp_path);
free(tmp_path);
}
else
{
succp = false;
}
break;
case 'S':
{
char* tok = strstr(optarg, "=");
if (tok)
{
tok++;
if (tok)
{
*maxlog_enabled = config_truth_value(tok);
maxlog_configured = true;
}
}
else
{
*maxlog_enabled = config_truth_value(optarg);
maxlog_configured = true;
}
}
break;
case 's':
{
char* tok = strstr(optarg, "=");
if (tok)
{
tok++;
if (tok)
{
*syslog_enabled = config_truth_value(tok);
syslog_configured = true;
}
}
else
{
*syslog_enabled = config_truth_value(optarg);
syslog_configured = true;
}
}
break;
case 'U':
specified_user = optarg;
if (set_user(specified_user) != 0)
{
succp = false;
}
break;
case 'G':
set_log_augmentation(optarg);
break;
case '?':
usage();
rc = EXIT_SUCCESS;
goto return_main;
case 'c':
cnf->config_check = true;
break;
case 'e':
cnf->config_check = true;
strcpy(export_cnf, optarg);
break;
case 'p':
cnf->passive = true;
break;
case 'g':
if (!handle_debug_args(optarg))
{
succp = false;
}
break;
default:
usage();
succp = false;
break;
}
if (!succp)
{
rc = MAXSCALE_BADARG;
goto return_main;
}
}
if (!user_is_acceptable(specified_user))
{
// Error was logged in user_is_acceptable().
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
if (cnf->config_check)
{
daemon_mode = false;
cnf->log_target = MXB_LOG_TARGET_STDOUT;
}
#ifdef HAVE_SYSTEMD
// Systemd watchdog. Must be called in the initial thread */
uint64_t systemd_interval; // in microseconds
if (sd_watchdog_enabled(false, &systemd_interval) > 0)
{
RoutingWorker::set_watchdog_interval(systemd_interval);
}
#endif
if (!daemon_mode)
{
fprintf(stderr,
"Info : MaxScale will be run in the terminal process.\n");
#if defined (SS_DEBUG)
fprintf(stderr,
"\tSee "
"the log from the following log files : \n\n");
#endif
}
else
{
if (pipe(daemon_pipe) == -1)
{
fprintf(stderr,
"Error: Failed to create pipe for inter-process communication: %d %s",
errno,
strerror(errno));
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
/*<
* Maxscale must be daemonized before opening files, initializing
* embedded MariaDB and in general, as early as possible.
*/
if (!disable_signals())
{
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
/** Daemonize the process and wait for the child process to notify
* the parent process of its exit status. */
parent_process = daemonize();
if (parent_process)
{
close(daemon_pipe[1]);
int nread = read(daemon_pipe[0], (void*)&child_status, sizeof(int));
close(daemon_pipe[0]);
if (nread == -1)
{
const char* logerr = "Failed to read data from child process pipe.";
print_log_n_stderr(true, true, logerr, logerr, errno);
exit(MAXSCALE_INTERNALERROR);
}
else if (nread == 0)
{
/** Child process has exited or closed write pipe */
const char* logerr = "No data read from child process pipe.";
print_log_n_stderr(true, true, logerr, logerr, 0);
exit(MAXSCALE_INTERNALERROR);
}
_exit(child_status);
}
/** This is the child process and we can close the read end of
* the pipe. */
close(daemon_pipe[0]);
}
/*<
* Set signal handlers for SIGHUP, SIGTERM, SIGINT and critical signals like SIGSEGV.
*/
if (!configure_signals())
{
static const char* logerr = "Failed to configure signal handlers. Exiting.";
print_log_n_stderr(true, true, logerr, logerr, 0);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
eno = pthread_sigmask(SIG_BLOCK, &sigpipe_mask, &saved_mask);
if (eno != 0)
{
const char* logerr = "Failed to initialise signal mask for MaxScale. Exiting.";
print_log_n_stderr(true, true, logerr, logerr, eno);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
if (!utils_init())
{
const char* logerr = "Failed to initialise utility library.";
print_log_n_stderr(true, true, logerr, logerr, eno);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
/** OpenSSL initialization */
if (!HAVE_OPENSSL_THREADS)
{
const char* logerr = "OpenSSL library does not support multi-threading";
print_log_n_stderr(true, true, logerr, logerr, eno);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
SSL_library_init();
SSL_load_error_strings();
OPENSSL_add_all_algorithms_noconf();
#ifndef OPENSSL_1_1
numlocks = CRYPTO_num_locks();
if ((ssl_locks = (pthread_mutex_t*)MXS_MALLOC(sizeof(pthread_mutex_t) * (numlocks + 1))) == NULL)
{
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
for (int i = 0; i < numlocks + 1; i++)
{
pthread_mutex_init(&ssl_locks[i], NULL);
}
CRYPTO_set_locking_callback(ssl_locking_function);
CRYPTO_set_dynlock_create_callback(ssl_create_dynlock);
CRYPTO_set_dynlock_destroy_callback(ssl_free_dynlock);
CRYPTO_set_dynlock_lock_callback(ssl_lock_dynlock);
#ifdef OPENSSL_1_0
CRYPTO_THREADID_set_callback(maxscale_ssl_id);
#else
CRYPTO_set_id_callback(pthread_self);
#endif
#endif
/**
* Resolve the full pathname for configuration file and check for
* read accessibility.
*/
char pathbuf[PATH_MAX + 1];
snprintf(pathbuf, PATH_MAX, "%s", get_configdir());
pathbuf[PATH_MAX] = '\0';
if (pathbuf[strlen(pathbuf) - 1] != '/')
{
strcat(pathbuf, "/");
}
if (!resolve_maxscale_conf_fname(&cnf_file_path, pathbuf, cnf_file_arg))
{
rc = MAXSCALE_BADCONFIG;
goto return_main;
}
if (!sniff_configuration(cnf_file_path))
{
rc = MAXSCALE_BADCONFIG;
goto return_main;
}
if (mxb_log_inited())
{
// If the log was inited due to some error logging *and* we did not exit,
// we need to close it so that it can be opened again, this time with
// the final settings.
mxs_log_finish();
}
if (cnf->log_target != MXB_LOG_TARGET_STDOUT && daemon_mode)
{
mxs_log_redirect_stdout(true);
}
if (!init_log())
{
rc = MAXSCALE_BADCONFIG;
goto return_main;
}
if (!config_load_global(cnf_file_path))
{
rc = MAXSCALE_BADCONFIG;
goto return_main;
}
if (daemon_mode)
{
if (!change_cwd())
{
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
}
if (!init_sqlite3())
{
MXS_ERROR("Could not initialize sqlite3, exiting.");
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
MXS_NOTICE("MariaDB MaxScale %s started (Commit: %s)", MAXSCALE_VERSION, MAXSCALE_COMMIT);
MXS_NOTICE("MaxScale is running in process %i", getpid());
cleanup_old_process_datadirs();
if (!cnf->config_check)
{
/*
* Set the data directory. We use a unique directory name to avoid conflicts
* if multiple instances of MaxScale are being run on the same machine.
*/
if (create_datadir(get_datadir(), datadir))
{
set_process_datadir(datadir);
atexit(cleanup_process_datadir);
}
else
{
char errbuf[MXS_STRERROR_BUFLEN];
MXS_ERROR("Cannot create data directory '%s': %d %s\n",
datadir,
errno,
strerror_r(errno, errbuf, sizeof(errbuf)));
goto return_main;
}
}
if (!daemon_mode)
{
fprintf(stderr,
"Configuration file : %s\n"
"Log directory : %s\n"
"Data directory : %s\n"
"Module directory : %s\n"
"Service cache : %s\n\n",
cnf_file_path,
get_logdir(),
get_datadir(),
get_libdir(),
get_cachedir());
}
if (!(*syslog_enabled) && !(*maxlog_enabled))
{
fprintf(stderr, "warning: Both MaxScale and Syslog logging disabled.\n");
}
MXS_NOTICE("Configuration file: %s", cnf_file_path);
MXS_NOTICE("Log directory: %s", get_logdir());
MXS_NOTICE("Data directory: %s", get_datadir());
MXS_NOTICE("Module directory: %s", get_libdir());
MXS_NOTICE("Service cache: %s", get_cachedir());
if (!maxbase::init())
{
MXS_ERROR("Failed to initialize MaxScale base library.");
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
// Initialize the housekeeper
main_worker = new maxscale::MainWorker;
if (!qc_setup(&cnf->qc_cache_properties, cnf->qc_sql_mode, cnf->qc_name, cnf->qc_args))
{
const char* logerr = "Failed to initialise query classifier library.";
print_log_n_stderr(true, true, logerr, logerr, eno);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
if (!cnf->config_check)
{
/** Check if a MaxScale process is already running */
if (pid_file_exists())
{
/** There is a process with the PID of the maxscale.pid file running.
* Assuming that this is an already running MaxScale process, we
* should exit with an error code. */
rc = MAXSCALE_ALREADYRUNNING;
goto return_main;
}
/* Write process pid into MaxScale pidfile */
if (write_pid_file() != 0)
{
rc = MAXSCALE_ALREADYRUNNING;
goto return_main;
}
pid_file_created = true;
if (!lock_directories())
{
rc = MAXSCALE_ALREADYRUNNING;
goto return_main;
}
atexit(unlock_directories);
}
if (!redirect_output_to.empty())
{
if (freopen(redirect_output_to.c_str(), "a", stdout))
{
if (!freopen(redirect_output_to.c_str(), "a", stderr))
{
const char* logstr = "Failed to redirect stderr to file.";
// No point logging to stderr as its state is now not known.
print_log_n_stderr(true, false, logstr, logstr, errno);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
}
else
{
const char* logstr = "Failed to redirect stdout to file.";
print_log_n_stderr(true, true, logstr, logstr, errno);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
}
/* Init MaxScale poll system */
poll_init();
dcb_global_init();
/** Load the admin users */
admin_users_init();
/* Initialize the internal query classifier. The plugin will be initialized
* via the module initialization below.
*/
if (!qc_process_init(QC_INIT_SELF))
{
MXS_ERROR("Failed to initialize the internal query classifier.");
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
// Before we start the workers we need to check if a shutdown signal has been received
if (maxscale_is_shutting_down())
{
rc = MAXSCALE_SHUTDOWN;
goto return_main;
}
if (!RoutingWorker::init())
{
MXS_ERROR("Failed to initialize routing workers.");
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
/**
* If a shutdown signal was received while we were initializing the workers, we need to exit.
* After this point, the shutdown will be driven by the workers.
*/
if (maxscale_is_shutting_down())
{
rc = MAXSCALE_SHUTDOWN;
goto return_main;
}
if (!config_load(cnf_file_path))
{
const char* fprerr =
"Failed to open, read or process the MaxScale configuration "
"file. Exiting. See the error log for details.";
print_log_n_stderr(false, true, fprerr, fprerr, 0);
MXS_ERROR("Failed to open, read or process the MaxScale configuration file %s. "
"Exiting.",
cnf_file_path);
rc = MAXSCALE_BADCONFIG;
goto return_main;
}
/* Init MaxScale modules */
if (!modules_process_init())
{
MXS_ERROR("Failed to initialize all modules at startup. Exiting.");
rc = MAXSCALE_BADCONFIG;
goto return_main;
}
/** Start all monitors */
monitor_start_all();
if (cnf->config_check)
{
MXS_NOTICE("Configuration was successfully verified.");
if (*export_cnf && export_config_file(export_cnf))
{
MXS_NOTICE("Configuration exported to '%s'", export_cnf);
}
rc = MAXSCALE_SHUTDOWN;
goto return_main;
}
/*<
* Start the routing workers running in their own thread.
*/
if (!RoutingWorker::start_workers())
{
const char* logerr = "Failed to start routing workers.";
print_log_n_stderr(true, true, logerr, logerr, 0);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
if (cnf->admin_enabled)
{
bool success = mxs_admin_init();
if (!success && strcmp(cnf->admin_host, "::") == 0)
{
MXS_WARNING("Failed to bind on address '::', attempting to "
"bind on IPv4 address '0.0.0.0'.");
strcpy(cnf->admin_host, "0.0.0.0");
success = mxs_admin_init();
}
if (success)
{
MXS_NOTICE("Started REST API on [%s]:%u", cnf->admin_host, cnf->admin_port);
}
else
{
const char* logerr = "Failed to initialize admin interface";
print_log_n_stderr(true, true, logerr, logerr, 0);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
}
MXS_NOTICE("MaxScale started with %d worker threads, each with a stack size of %lu bytes.",
config_threadcount(),
config_thread_stack_size());
worker = RoutingWorker::get(RoutingWorker::MAIN);
mxb_assert(worker);
if (!worker->execute(do_startup, RoutingWorker::EXECUTE_QUEUED))
{
const char* logerr = "Failed to queue startup task.";
print_log_n_stderr(true, true, logerr, logerr, 0);
rc = MAXSCALE_INTERNALERROR;
goto return_main;
}
main_worker->run();
/** Stop administrative interface */
mxs_admin_shutdown();
/*< Stop all monitors */
monitor_stop_all();
/*< Destroy all monitors */
MonitorManager::destroy_all_monitors();
/*<
* Wait for worker threads to exit.
*/
RoutingWorker::join_workers();
MXS_NOTICE("All workers have shut down.");
maxscale_start_teardown();
/*<
* Destroy the router and filter instances of all services.
*/
service_destroy_instances();
filter_destroy_instances();
RoutingWorker::finish();
maxbase::finish();
/*< Call finish on all modules. */
modules_process_finish();
/* Finalize the internal query classifier. The plugin was finalized
* via the module finalizarion above.
*/
qc_process_end(QC_INIT_SELF);
log_exit_status();
MXS_NOTICE("MaxScale is shutting down.");
utils_end();
MXS_NOTICE("MaxScale shutdown completed.");
if (unload_modules_at_exit)
{
unload_all_modules();
}
ERR_free_strings();
EVP_cleanup();
return_main:
if (pid_file_created)
{
unlock_pidfile();
unlink_pidfile();
}
if (daemon_mode && rc != MAXSCALE_SHUTDOWN)
{
/** Notify the parent process that an error has occurred */
write_child_exit_code(daemon_pipe[1], rc);
}
MXS_FREE(cnf_file_arg);
if (cnf_file_path)
{
MXS_FREE(cnf_file_path);
}
config_finish();
delete main_worker;
main_worker = nullptr;
return rc;
} /*< End of main */
static void unlock_pidfile()
{
if (pidfd != PIDFD_CLOSED)
{
if (flock(pidfd, LOCK_UN | LOCK_NB) != 0)
{
char logbuf[STRING_BUFFER_SIZE + PATH_MAX];
const char* logerr = "Failed to unlock PID file '%s'.";
snprintf(logbuf, sizeof(logbuf), logerr, pidfile);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
}
close(pidfd);
}
}
/**
* Unlink pid file, called at program exit
*/
static void unlink_pidfile(void)
{
if (strlen(pidfile))
{
if (unlink(pidfile))
{
fprintf(stderr,
"MaxScale failed to remove pidfile %s: error %d, %s\n",
pidfile,
errno,
mxs_strerror(errno));
}
}
}
bool pid_is_maxscale(int pid)
{
bool rval = false;
std::stringstream ss;
ss << "/proc/" << pid << "/comm";
std::ifstream file(ss.str());
std::string line;
if (file && std::getline(file, line))
{
if (line == "maxscale")
{
rval = true;
}
}
return rval;
}
/**
* Check if the maxscale.pid file exists and has a valid PID in it. If one has already been
* written and a MaxScale process is running, this instance of MaxScale should shut down.
* @return True if the conditions for starting MaxScale are not met and false if
* no PID file was found or there is no process running with the PID of the maxscale.pid
* file. If false is returned, this process should continue normally.
*/
bool pid_file_exists()
{
char pathbuf[PATH_MAX + 1];
char logbuf[STRING_BUFFER_SIZE + PATH_MAX];
char pidbuf[STRING_BUFFER_SIZE];
pid_t pid;
bool lock_failed = false;
snprintf(pathbuf, PATH_MAX, "%s/maxscale.pid", get_piddir());
pathbuf[PATH_MAX] = '\0';
if (access(pathbuf, F_OK) != 0)
{
return false;
}
if (access(pathbuf, R_OK) == 0)
{
int fd, b;
if ((fd = open(pathbuf, O_RDWR)) == -1)
{
const char* logerr = "Failed to open PID file '%s'.";
snprintf(logbuf, sizeof(logbuf), logerr, pathbuf);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
return true;
}
if (flock(fd, LOCK_EX | LOCK_NB))
{
if (errno != EWOULDBLOCK)
{
const char* logerr = "Failed to lock PID file '%s'.";
snprintf(logbuf, sizeof(logbuf), logerr, pathbuf);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
close(fd);
return true;
}
lock_failed = true;
}
pidfd = fd;
b = read(fd, pidbuf, sizeof(pidbuf));
if (b == -1)
{
const char* logerr = "Failed to read from PID file '%s'.";
snprintf(logbuf, sizeof(logbuf), logerr, pathbuf);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
unlock_pidfile();
return true;
}
else if (b == 0)
{
/** Empty file */
const char* logerr =
"PID file read from '%s'. File was empty.\n"
"If the file is the correct PID file and no other MaxScale processes "
"are running, please remove it manually and start MaxScale again.";
snprintf(logbuf, sizeof(logbuf), logerr, pathbuf);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
unlock_pidfile();
return true;
}
pidbuf[(size_t)b < sizeof(pidbuf) ? (size_t)b : sizeof(pidbuf) - 1] = '\0';
pid = strtol(pidbuf, NULL, 0);
if (pid < 1)
{
/** Bad PID */
const char* logerr =
"PID file read from '%s'. File contents not valid.\n"
"If the file is the correct PID file and no other MaxScale processes "
"are running, please remove it manually and start MaxScale again.";
snprintf(logbuf, sizeof(logbuf), logerr, pathbuf);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
unlock_pidfile();
return true;
}
if (pid_is_maxscale(pid))
{
const char* logerr =
"MaxScale is already running. Process id: %d. "
"Use another location for the PID file to run multiple "
"instances of MaxScale on the same machine.";
snprintf(logbuf, sizeof(logbuf), logerr, pid);
print_log_n_stderr(true, true, logbuf, logbuf, 0);
unlock_pidfile();
}
else
{
/** no such process, old PID file */
if (lock_failed)
{
const char* logerr =
"Locking the PID file '%s' failed. "
"Read PID from file and no process found with PID %d. "
"Confirm that no other process holds the lock on the PID file.";
snprintf(logbuf, sizeof(logbuf), logerr, pathbuf, pid);
print_log_n_stderr(true, true, logbuf, logbuf, 0);
close(fd);
}
return lock_failed;
}
}
else
{
const char* logerr =
"Cannot open PID file '%s', no read permissions. "
"Please confirm that the user running MaxScale has read permissions on the file.";
snprintf(logbuf, sizeof(logbuf), logerr, pathbuf);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
}
return true;
}
/**
* Write process pid into pidfile anc close it
* Parameters:
* @param home_dir The MaxScale home dir
* @return 0 on success, 1 on failure
*
*/
static int write_pid_file()
{
if (!mxs_mkdir_all(get_piddir(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH))
{
MXS_ERROR("Failed to create PID directory.");
return 1;
}
char logbuf[STRING_BUFFER_SIZE + PATH_MAX];
char pidstr[STRING_BUFFER_SIZE];
snprintf(pidfile, PATH_MAX, "%s/maxscale.pid", get_piddir());
if (pidfd == PIDFD_CLOSED)
{
int fd = -1;
fd = open(pidfile, O_WRONLY | O_CREAT, 0777);
if (fd == -1)
{
const char* logerr = "Failed to open PID file '%s'.";
snprintf(logbuf, sizeof(logbuf), logerr, pidfile);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
return -1;
}
if (flock(fd, LOCK_EX | LOCK_NB))
{
if (errno == EWOULDBLOCK)
{
snprintf(logbuf,
sizeof(logbuf),
"Failed to lock PID file '%s', another process is holding a lock on it. "
"Please confirm that no other MaxScale process is using the same "
"PID file location.",
pidfile);
}
else
{
snprintf(logbuf, sizeof(logbuf), "Failed to lock PID file '%s'.", pidfile);
}
print_log_n_stderr(true, true, logbuf, logbuf, errno);
close(fd);
return -1;
}
pidfd = fd;
}
/* truncate pidfile content */
if (ftruncate(pidfd, 0))
{
const char* logerr = "MaxScale failed to truncate PID file '%s'.";
snprintf(logbuf, sizeof(logbuf), logerr, pidfile);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
unlock_pidfile();
return -1;
}
snprintf(pidstr, sizeof(pidstr) - 1, "%d", getpid());
if (pwrite(pidfd, pidstr, strlen(pidstr), 0) != (ssize_t)strlen(pidstr))
{
const char* logerr = "MaxScale failed to write into PID file '%s'.";
snprintf(logbuf, sizeof(logbuf), logerr, pidfile);
print_log_n_stderr(true, true, logbuf, logbuf, errno);
unlock_pidfile();
return -1;
}
/* success */
return 0;
}
bool handle_path_arg(char** dest, const char* path, const char* arg, bool rd, bool wr)
{
char pathbuffer[PATH_MAX + 2];
char* errstr;
bool rval = false;
if (path == NULL && arg == NULL)
{
return rval;
}
if (path)
{
snprintf(pathbuffer, PATH_MAX, "%s", path);
if (pathbuffer[strlen(path) - 1] != '/')
{
strcat(pathbuffer, "/");
}
if (arg && strlen(pathbuffer) + strlen(arg) + 1 < PATH_MAX)
{
strcat(pathbuffer, arg);
}
if ((errstr = check_dir_access(pathbuffer, rd, wr)) == NULL)
{
*dest = MXS_STRDUP_A(pathbuffer);
rval = true;
}
else
{
print_log_n_stderr(true, true, errstr, errstr, 0);
MXS_FREE(errstr);
errstr = NULL;
}
}
return rval;
}
void set_log_augmentation(const char* value)
{
// Command line arguments are handled first, thus command line argument
// has priority.
static bool augmentation_set = false;
if (!augmentation_set)
{
mxs_log_set_augmentation(atoi(value));
augmentation_set = true;
}
}
/**
* Pre-parse the configuration file for various directory paths.
* @param data Pointer to variable where custom dynamically allocated
* error message can be stored.
* @param section Section name
* @param name Parameter name
* @param value Parameter value
* @return 0 on error, 1 when successful
*/
static int cnf_preparser(void* data, const char* section, const char* name, const char* value)
{
MXS_CONFIG* cnf = config_get_global_options();
char* tmp;
/** These are read from the configuration file. These will not override
* command line parameters but will override default values. */
if (strcasecmp(section, "maxscale") == 0)
{
if (cnf->substitute_variables)
{
if (*value == '$')
{
char* env_value = getenv(value + 1);
if (!env_value)
{
char** s = (char**)data;
static const char FORMAT[] = "The environment variable %s does not exist.";
*s = (char*)MXS_MALLOC(sizeof(FORMAT) + strlen(value));
if (*s)
{
sprintf(*s, FORMAT, value + 1);
}
return 0;
}
value = env_value;
}
}
if (strcmp(name, CN_LOGDIR) == 0)
{
if (strcmp(get_logdir(), default_logdir) == 0)
{
if (handle_path_arg(&tmp, (char*)value, NULL, true, true))
{
set_logdir(tmp);
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_LIBDIR) == 0)
{
if (strcmp(get_libdir(), default_libdir) == 0)
{
if (handle_path_arg(&tmp, (char*)value, NULL, true, false))
{
set_libdir(tmp);
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_PIDDIR) == 0)
{
if (strcmp(get_piddir(), default_piddir) == 0)
{
if (handle_path_arg(&tmp, (char*)value, NULL, true, true))
{
set_piddir(tmp);
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_DATADIR) == 0)
{
if (!datadir_defined)
{
if (handle_path_arg(&tmp, (char*)value, NULL, true, false))
{
snprintf(datadir, PATH_MAX, "%s", tmp);
datadir[PATH_MAX] = '\0';
set_datadir(tmp);
datadir_defined = true;
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_CACHEDIR) == 0)
{
if (strcmp(get_cachedir(), default_cachedir) == 0)
{
if (handle_path_arg((char**)&tmp, (char*)value, NULL, true, false))
{
set_cachedir(tmp);
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_LANGUAGE) == 0)
{
if (strcmp(get_langdir(), default_langdir) == 0)
{
if (handle_path_arg((char**)&tmp, (char*)value, NULL, true, false))
{
set_langdir(tmp);
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_EXECDIR) == 0)
{
if (strcmp(get_execdir(), default_execdir) == 0)
{
if (handle_path_arg((char**)&tmp, (char*)value, NULL, true, false))
{
set_execdir(tmp);
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_CONNECTOR_PLUGINDIR) == 0)
{
if (strcmp(get_connector_plugindir(), default_connector_plugindir) == 0)
{
if (handle_path_arg((char**)&tmp, (char*)value, NULL, true, false))
{
set_connector_plugindir(tmp);
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_PERSISTDIR) == 0)
{
if (strcmp(get_config_persistdir(), default_config_persistdir) == 0)
{
if (handle_path_arg((char**)&tmp, (char*)value, NULL, true, false))
{
set_config_persistdir(tmp);
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_MODULE_CONFIGDIR) == 0)
{
if (strcmp(get_module_configdir(), default_module_configdir) == 0)
{
if (handle_path_arg((char**)&tmp, (char*)value, NULL, true, false))
{
set_module_configdir(tmp);
}
else
{
return 0;
}
}
}
else if (strcmp(name, CN_SYSLOG) == 0)
{
if (!syslog_configured)
{
cnf->syslog = config_truth_value((char*)value);
}
}
else if (strcmp(name, CN_MAXLOG) == 0)
{
if (!maxlog_configured)
{
cnf->maxlog = config_truth_value((char*)value);
}
}
else if (strcmp(name, CN_LOG_AUGMENTATION) == 0)
{
set_log_augmentation(value);
}
else if (strcmp(name, CN_LOG_TO_SHM) == 0)
{
fprintf(stderr,
"Warning: '%s' has been removed in MaxScale 2.3.0 "
"and will be ignored\n",
CN_LOG_TO_SHM);
}
else if (strcmp(name, CN_SUBSTITUTE_VARIABLES) == 0)
{
cnf->substitute_variables = config_truth_value(value);
}
}
return 1;
}
static int set_user(const char* user)
{
errno = 0;
struct passwd* pwname;
int rval;
pwname = getpwnam(user);
if (pwname == NULL)
{
printf("Error: Failed to retrieve user information for '%s': %d %s\n",
user,
errno,
errno == 0 ? "User not found" : mxs_strerror(errno));
return -1;
}
rval = setgid(pwname->pw_gid);
if (rval != 0)
{
printf("Error: Failed to change group to '%d': %d %s\n",
pwname->pw_gid,
errno,
mxs_strerror(errno));
return rval;
}
rval = setuid(pwname->pw_uid);
if (rval != 0)
{
printf("Error: Failed to change user to '%s': %d %s\n",
pwname->pw_name,
errno,
mxs_strerror(errno));
return rval;
}
if (prctl(PR_GET_DUMPABLE) == 0)
{
if (prctl(PR_SET_DUMPABLE, 1) == -1)
{
printf("Error: Failed to set dumpable flag on for the process '%s': %d %s\n",
pwname->pw_name,
errno,
mxs_strerror(errno));
return -1;
}
}
#ifdef SS_DEBUG
else
{
printf("Running MaxScale as: %s %d:%d\n", pwname->pw_name, pwname->pw_uid, pwname->pw_gid);
}
#endif
return rval;
}
/**
* Write the exit status of the child process to the parent process.
* @param fd File descriptor to write to
* @param code Exit status of the child process
*/
void write_child_exit_code(int fd, int code)
{
/** Notify the parent process that an error has occurred */
if (write(fd, &code, sizeof(int)) == -1)
{
printf("Failed to write child process message!\n");
}
close(fd);
}
/**
* Change the current working directory
*
* Change the current working directory to the log directory. If this is not
* possible, try to change location to the file system root. If this also fails,
* return with an error.
* @return True if changing the current working directory was successful.
*/
static bool change_cwd()
{
bool rval = true;
if (chdir(get_logdir()) != 0)
{
MXS_ERROR("Failed to change working directory to '%s': %d, %s. "
"Trying to change working directory to '/'.",
get_logdir(),
errno,
mxs_strerror(errno));
if (chdir("/") != 0)
{
MXS_ERROR("Failed to change working directory to '/': %d, %s",
errno,
mxs_strerror(errno));
rval = false;
}
else
{
MXS_WARNING("Using '/' instead of '%s' as the current working directory.",
get_logdir());
}
}
else
{
MXS_NOTICE("Working directory: %s", get_logdir());
}
return rval;
}
/**
* @brief Log a message about the last received signal
*/
static void log_exit_status()
{
switch (last_signal)
{
case SIGTERM:
MXS_NOTICE("MaxScale received signal SIGTERM. Exiting.");
break;
case SIGINT:
MXS_NOTICE("MaxScale received signal SIGINT. Exiting.");
break;
default:
break;
}
}
/**
* Daemonize the process by forking and putting the process into the
* background.
*
* @return True if context is that of the parent process, false if that of the
* child process.
*/
static bool daemonize(void)
{
pid_t pid;
pid = fork();
if (pid < 0)
{
fprintf(stderr, "fork() error %s\n", mxs_strerror(errno));
exit(1);
}
if (pid != 0)
{
/* exit from main */
return true;
}
if (setsid() < 0)
{
fprintf(stderr, "setsid() error %s\n", mxs_strerror(errno));
exit(1);
}
return false;
}
/**
* Sniffs the configuration file, primarily for various directory paths,
* so that certain settings take effect immediately.
*
* @param filepath The path of the configuration file.
*
* @return True, if the sniffing succeeded, false otherwise.
*/
static bool sniff_configuration(const char* filepath)
{
char* s = NULL;
int rv = ini_parse(filepath, cnf_preparser, &s);
if (rv != 0)
{
const char FORMAT_CUSTOM[] =
"Failed to pre-parse configuration file %s. Error on line %d. %s";
const char FORMAT_SYNTAX[] =
"Failed to pre-parse configuration file %s. Error on line %d.";
const char FORMAT_OPEN[] =
"Failed to pre-parse configuration file %s. Failed to open file.";
const char FORMAT_MALLOC[] =
"Failed to pre-parse configuration file %s. Memory allocation failed.";
size_t extra = strlen(filepath) + UINTLEN(abs(rv)) + (s ? strlen(s) : 0);
// We just use the largest one.
char errorbuffer[sizeof(FORMAT_MALLOC) + extra];
if (rv > 0)
{
if (s)
{
snprintf(errorbuffer, sizeof(errorbuffer), FORMAT_CUSTOM, filepath, rv, s);
MXS_FREE(s);
}
else
{
snprintf(errorbuffer, sizeof(errorbuffer), FORMAT_SYNTAX, filepath, rv);
}
}
else if (rv == -1)
{
snprintf(errorbuffer, sizeof(errorbuffer), FORMAT_OPEN, filepath);
}
else
{
snprintf(errorbuffer, sizeof(errorbuffer), FORMAT_MALLOC, filepath);
}
print_log_n_stderr(false, true, errorbuffer, errorbuffer, 0);
}
return rv == 0;
}
/**
* Calls init on all loaded modules.
*
* @return True, if all modules were successfully initialized.
*/
static bool modules_process_init()
{
bool initialized = false;
MXS_MODULE_ITERATOR i = mxs_module_iterator_get(NULL);
MXS_MODULE* module = NULL;
while ((module = mxs_module_iterator_get_next(&i)) != NULL)
{
if (module->process_init)
{
int rc = (module->process_init)();
if (rc != 0)
{
break;
}
}
}
if (module)
{
// If module is non-NULL it means that the initialization failed for
// that module. We now need to call finish on all modules that were
// successfully initialized.
MXS_MODULE* failed_module = module;
i = mxs_module_iterator_get(NULL);
while ((module = mxs_module_iterator_get_next(&i)) != failed_module)
{
if (module->process_finish)
{
(module->process_finish)();
}
}
}
else
{
initialized = true;
}
return initialized;
}
/**
* Calls process_finish on all loaded modules.
*/
static void modules_process_finish()
{
MXS_MODULE_ITERATOR i = mxs_module_iterator_get(NULL);
MXS_MODULE* module = NULL;
while ((module = mxs_module_iterator_get_next(&i)) != NULL)
{
if (module->process_finish)
{
(module->process_finish)();
}
}
}
static void enable_module_unloading(const char* arg)
{
unload_modules_at_exit = true;
}
static void disable_module_unloading(const char* arg)
{
unload_modules_at_exit = false;
}
static void enable_statement_logging(const char* arg)
{
maxsql::mysql_set_log_statements(true);
}
static void disable_statement_logging(const char* arg)
{
maxsql::mysql_set_log_statements(false);
}
static void redirect_output_to_file(const char* arg)
{
if (arg)
{
redirect_output_to = arg;
}
}
/**
* Process command line debug arguments
*
* @param args The debug argument list
* @return True on success, false on error
*/
static bool handle_debug_args(char* args)
{
bool arg_error = false;
int args_found = 0;
char* endptr = NULL;
char* token = strtok_r(args, ",", &endptr);
while (token)
{
char* value = strchr(token, '=');
if (value)
{
*value++ = '\0';
}
bool found = false;
for (int i = 0; debug_arguments[i].action != NULL; i++)
{
// Debug features are activated by running functions in the struct-array.
if (strcmp(token, debug_arguments[i].name) == 0)
{
found = true;
args_found++;
debug_arguments[i].action(value);
break;
}
}
if (!found)
{
const char UNRECOG_P1[] = "Unrecognized debug setting: '";
const char UNRECOG_P2[] = "'.";
size_t unrecog_msg_len = sizeof(UNRECOG_P1) + strlen(token) + sizeof(UNRECOG_P2);
char unrecog_msg[unrecog_msg_len];
snprintf(unrecog_msg, unrecog_msg_len, "%s%s%s", UNRECOG_P1, token, UNRECOG_P2);
print_log_n_stderr(true, true, unrecog_msg, unrecog_msg, 0);
arg_error = true;
}
token = strtok_r(NULL, ",", &endptr);
}
if (args_found == 0)
{
arg_error = true;
}
if (arg_error)
{
// Form a string with all debug argument names listed.
size_t total_len = 1;
for (int i = 0; debug_arguments[i].action != NULL; i++)
{
total_len += strlen(debug_arguments[i].name) + 1;
}
char arglist[total_len];
arglist[0] = '\0';
for (int i = 0; debug_arguments[i].action != NULL; i++)
{
strcat(arglist, debug_arguments[i].name);
// If not the last element, add a comma
if (debug_arguments[i + 1].action != NULL)
{
strcat(arglist, ", ");
}
}
const char DEBUG_ERROR_P1[] =
"Debug argument identifier '-g' or '--debug' was specified "
"but no arguments were found or one of them was invalid. Supported "
"arguments are: ";
const char DEBUG_ERROR_P2[] = ".";
size_t arg_error_msg_len = sizeof(DEBUG_ERROR_P1) + total_len + sizeof(DEBUG_ERROR_P2);
char arg_error_msg[arg_error_msg_len];
snprintf(arg_error_msg,
arg_error_msg_len,
"%s%s%s",
DEBUG_ERROR_P1,
arglist,
DEBUG_ERROR_P2);
print_log_n_stderr(true, true, arg_error_msg, arg_error_msg, 0);
}
return !arg_error;
}
static bool user_is_acceptable(const char* specified_user)
{
bool acceptable = false;
// This is very early, so we do not have logging available, but write to stderr.
// As this is security related, we want to do as little as possible.
uid_t uid = getuid(); // Always succeeds
errno = 0;
struct passwd* pw = getpwuid(uid);
if (pw)
{
if (strcmp(pw->pw_name, "root") == 0)
{
if (specified_user && (strcmp(specified_user, "root") == 0))
{
// MaxScale was invoked as root and with --user=root.
acceptable = true;
}
else
{
fprintf(stderr, "Error: MaxScale cannot be run as root.\n");
}
}
else
{
acceptable = true;
}
}
else
{
fprintf(stderr,
"Error: Could not obtain user information, MaxScale will not run: %s",
strerror(errno));
}
return acceptable;
}
static bool init_sqlite3()
{
bool rv = true;
// Collecting the memstatus introduces locking that, according to customer reports,
// has a significant impact on the performance.
if (sqlite3_config(SQLITE_CONFIG_MEMSTATUS, (int)0) == SQLITE_OK) // 0 turns off.
{
MXS_NOTICE("The collection of SQLite memory allocation statistics turned off.");
}
else
{
MXS_WARNING("Could not turn off the collection of SQLite memory allocation statistics.");
// Non-fatal, we simply will take a small performance hit.
}
if (sqlite3_config(SQLITE_CONFIG_MULTITHREAD) == SQLITE_OK)
{
MXS_NOTICE("Threading mode of SQLite set to Multi-thread.");
}
else
{
MXS_ERROR("Could not set the threading mode of SQLite to Multi-thread. "
"MaxScale will terminate.");
rv = false;
}
return rv;
}
static bool lock_dir(const std::string& path)
{
std::string lock = path + "/maxscale.lock";
int fd = open(lock.c_str(), O_WRONLY | O_CREAT, 0777);
std::string pid = std::to_string(getpid());
if (fd == -1)
{
MXS_ERROR("Failed to open lock file %s: %s", lock.c_str(), mxs_strerror(errno));
return false;
}
if (lockf(fd, F_TLOCK, 0) == -1)
{
if (errno == EACCES || errno == EAGAIN)
{
MXS_ERROR("Failed to lock directory with file '%s', another process is holding a lock on it. "
"Please confirm that no other MaxScale process is using the "
"directory %s",
lock.c_str(),
path.c_str());
}
else
{
MXS_ERROR("Failed to lock file %s. %s", lock.c_str(), mxs_strerror(errno));
}
close(fd);
return false;
}
if (ftruncate(fd, 0) == -1)
{
MXS_ERROR("Failed to truncate lock file %s: %s", lock.c_str(), mxs_strerror(errno));
close(fd);
unlink(lock.c_str());
return false;
}
if (write(fd, pid.c_str(), pid.length()) == -1)
{
MXS_ERROR("Failed to write into lock file %s: %s", lock.c_str(), mxs_strerror(errno));
close(fd);
unlink(lock.c_str());
return false;
}
directory_locks.insert(std::pair<std::string, int>(lock, fd));
return true;
}
bool lock_directories()
{
std::set<std::string> paths {get_cachedir(), get_datadir()};
return std::all_of(paths.begin(), paths.end(), lock_dir);
}
static void unlock_directories()
{
std::for_each(directory_locks.begin(),
directory_locks.end(),
[&](std::pair<std::string, int> pair) {
close(pair.second);
unlink(pair.first.c_str());
});
}
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