/*
* PerformAuthentication -- authenticate a remote client
*
* returns: nothing. Will not return at all if there's any failure.
*/
static void
PerformAuthentication(Port *port)
{
/* This should be set already, but let's make sure */
ClientAuthInProgress = true; /* limit visibility of log messages */
/*
* In EXEC_BACKEND case, we didn't inherit the contents of pg_hba.conf
* etcetera from the postmaster, and have to load them ourselves. Note we
* are loading them into the startup transaction's memory context, not
* PostmasterContext, but that shouldn't matter.
*
* FIXME: [fork/exec] Ugh. Is there a way around this overhead?
*/
#ifdef EXEC_BACKEND
if (!load_hba())
{
/*
* It makes no sense to continue if we fail to load the HBA file,
* since there is no way to connect to the database in this case.
*/
ereport(FATAL,
(errmsg("could not load pg_hba.conf")));
}
load_ident();
#endif
/*
* Set up a timeout in case a buggy or malicious client fails to respond
* during authentication. Since we're inside a transaction and might do
* database access, we have to use the statement_timeout infrastructure.
*/
enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
/*
* Now perform authentication exchange.
*/
ClientAuthentication(port); /* might not return, if failure */
/*
* Done with authentication. Disable the timeout, and log if needed.
*/
disable_timeout(STATEMENT_TIMEOUT, false);
if (Log_connections)
{
if (am_walsender)
ereport(LOG,
(errmsg("replication connection authorized: user=%s",
port->user_name)));
else
ereport(LOG,
(errmsg("connection authorized: user=%s database=%s",
port->user_name, port->database_name)));
}
set_ps_display("startup", false);
ClientAuthInProgress = false; /* client_min_messages is active now */
}
static void reload_config(void)
{
pool_log("reload config files.");
pool_get_config(get_config_file_name(), RELOAD_CONFIG);
if (pool_config->enable_pool_hba)
load_hba(get_hba_file_name());
reload_config_request = 0;
}
static void reload_config(void)
{
pool_log("reload config files.");
pool_get_config(conf_file, RELOAD_CONFIG);
if (pool_config->enable_pool_hba)
load_hba(hba_file);
if (pool_config->parallel_mode)
pool_memset_system_db_info(system_db_info->info);
kill_all_children(SIGHUP);
}
/*
* PerformAuthentication -- authenticate a remote client
*
* returns: nothing. Will not return at all if there's any failure.
*/
static void
PerformAuthentication(Port *port)
{
/* This should be set already, but let's make sure */
ClientAuthInProgress = true; /* limit visibility of log messages */
/*
* In EXEC_BACKEND case, we didn't inherit the contents of pg_hba.conf
* etcetera from the postmaster, and have to load them ourselves.
*
* FIXME: [fork/exec] Ugh. Is there a way around this overhead?
*/
#ifdef EXEC_BACKEND
if (!load_hba())
{
/*
* It makes no sense to continue if we fail to load the HBA file,
* since there is no way to connect to the database in this case.
*/
ereport(FATAL,
(errmsg("could not load pg_hba.conf")));
}
if (!load_ident())
{
/*
* It is ok to continue if we fail to load the IDENT file, although it
* means that you cannot log in using any of the authentication
* methods that need a user name mapping. load_ident() already logged
* the details of error to the log.
*/
}
#endif
/*
* Set up a timeout in case a buggy or malicious client fails to respond
* during authentication. Since we're inside a transaction and might do
* database access, we have to use the statement_timeout infrastructure.
*/
enable_timeout_after(STATEMENT_TIMEOUT, AuthenticationTimeout * 1000);
/*
* Now perform authentication exchange.
*/
ClientAuthentication(port); /* might not return, if failure */
/*
* Done with authentication. Disable the timeout, and log if needed.
*/
disable_timeout(STATEMENT_TIMEOUT, false);
if (Log_connections)
{
if (am_walsender)
{
#ifdef USE_SSL
if (port->ssl)
ereport(LOG,
(errmsg("replication connection authorized: user=%s SSL enabled (protocol=%s, cipher=%s, compression=%s)",
port->user_name, SSL_get_version(port->ssl), SSL_get_cipher(port->ssl),
SSL_get_current_compression(port->ssl) ? _("on") : _("off"))));
else
#endif
ereport(LOG,
(errmsg("replication connection authorized: user=%s",
port->user_name)));
}
else
{
#ifdef USE_SSL
if (port->ssl)
ereport(LOG,
(errmsg("connection authorized: user=%s database=%s SSL enabled (protocol=%s, cipher=%s, compression=%s)",
port->user_name, port->database_name, SSL_get_version(port->ssl), SSL_get_cipher(port->ssl),
SSL_get_current_compression(port->ssl) ? _("on") : _("off"))));
else
#endif
ereport(LOG,
(errmsg("connection authorized: user=%s database=%s",
port->user_name, port->database_name)));
}
}
set_ps_display("startup", false);
ClientAuthInProgress = false; /* client_min_messages is active now */
}
/*
* perform accept() and return new fd
*/
static POOL_CONNECTION *do_accept(int unix_fd, int inet_fd, struct timeval *timeout)
{
fd_set readmask;
int fds;
int save_errno;
SockAddr saddr;
int fd = 0;
int afd;
int inet = 0;
POOL_CONNECTION *cp;
#ifdef ACCEPT_PERFORMANCE
struct timeval now1, now2;
static long atime;
static int cnt;
#endif
struct timeval *timeoutval;
struct timeval tv1, tv2, tmback = {0, 0};
set_ps_display("wait for connection request", false);
/* Destroy session context for just in case... */
pool_session_context_destroy();
FD_ZERO(&readmask);
FD_SET(unix_fd, &readmask);
if (inet_fd)
FD_SET(inet_fd, &readmask);
if (timeout->tv_sec == 0 && timeout->tv_usec == 0)
timeoutval = NULL;
else
{
timeoutval = timeout;
tmback.tv_sec = timeout->tv_sec;
tmback.tv_usec = timeout->tv_usec;
gettimeofday(&tv1, NULL);
#ifdef DEBUG
pool_log("before select = {%d, %d}", timeoutval->tv_sec, timeoutval->tv_usec);
pool_log("g:before select = {%d, %d}", tv1.tv_sec, tv1.tv_usec);
#endif
}
fds = select(Max(unix_fd, inet_fd)+1, &readmask, NULL, NULL, timeoutval);
save_errno = errno;
/* check backend timer is expired */
if (backend_timer_expired)
{
pool_backend_timer();
backend_timer_expired = 0;
}
/*
* following code fragment computes remaining timeout val in a
* portable way. Linux does this automatically but other platforms do not.
*/
if (timeoutval)
{
gettimeofday(&tv2, NULL);
tmback.tv_usec -= tv2.tv_usec - tv1.tv_usec;
tmback.tv_sec -= tv2.tv_sec - tv1.tv_sec;
if (tmback.tv_usec < 0)
{
tmback.tv_sec--;
if (tmback.tv_sec < 0)
{
timeout->tv_sec = 0;
timeout->tv_usec = 0;
}
else
{
tmback.tv_usec += 1000000;
timeout->tv_sec = tmback.tv_sec;
timeout->tv_usec = tmback.tv_usec;
}
}
#ifdef DEBUG
pool_log("g:after select = {%d, %d}", tv2.tv_sec, tv2.tv_usec);
pool_log("after select = {%d, %d}", timeout->tv_sec, timeout->tv_usec);
#endif
}
errno = save_errno;
if (fds == -1)
{
if (errno == EAGAIN || errno == EINTR)
return NULL;
pool_error("select() failed. reason %s", strerror(errno));
return NULL;
}
/* timeout */
if (fds == 0)
{
return NULL;
}
if (FD_ISSET(unix_fd, &readmask))
{
fd = unix_fd;
}
if (FD_ISSET(inet_fd, &readmask))
{
fd = inet_fd;
inet++;
}
/*
* Note that some SysV systems do not work here. For those
* systems, we need some locking mechanism for the fd.
*/
memset(&saddr, 0, sizeof(saddr));
saddr.salen = sizeof(saddr.addr);
#ifdef ACCEPT_PERFORMANCE
gettimeofday(&now1,0);
#endif
retry_accept:
/* wait if recovery is started */
while (*InRecovery == 1)
{
pause();
}
afd = accept(fd, (struct sockaddr *)&saddr.addr, &saddr.salen);
save_errno = errno;
/* check backend timer is expired */
if (backend_timer_expired)
{
pool_backend_timer();
backend_timer_expired = 0;
}
errno = save_errno;
if (afd < 0)
{
if (errno == EINTR && *InRecovery)
goto retry_accept;
/*
* "Resource temporarily unavailable" (EAGAIN or EWOULDBLOCK)
* can be silently ignored. And EINTR can be ignored.
*/
if (errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR)
pool_error("accept() failed. reason: %s", strerror(errno));
return NULL;
}
#ifdef ACCEPT_PERFORMANCE
gettimeofday(&now2,0);
atime += (now2.tv_sec - now1.tv_sec)*1000000 + (now2.tv_usec - now1.tv_usec);
cnt++;
if (cnt % 100 == 0)
{
pool_log("cnt: %d atime: %ld", cnt, atime);
}
#endif
/* reload config file */
if (got_sighup)
{
pool_get_config(get_config_file_name(), RELOAD_CONFIG);
if (pool_config->enable_pool_hba)
{
load_hba(get_hba_file_name());
if (strcmp("", pool_config->pool_passwd))
pool_reopen_passwd_file();
}
if (pool_config->parallel_mode)
pool_memset_system_db_info(system_db_info->info);
got_sighup = 0;
}
connection_count_up();
accepted = 1;
if (pool_config->parallel_mode)
{
/*
* do not accept new connection if any of DB node or SystemDB is down when operating in
* parallel mode
*/
int i;
for (i=0;i<NUM_BACKENDS;i++)
{
if (BACKEND_INFO(i).backend_status == CON_DOWN || SYSDB_STATUS == CON_DOWN)
{
StartupPacket *sp;
char *msg = "pgpool is not available in parallel query mode";
if (SYSDB_STATUS == CON_DOWN)
pool_log("Cannot accept() new connection. SystemDB is down");
else
pool_log("Cannot accept() new connection. %d th backend is down", i);
if ((cp = pool_open(afd)) == NULL)
{
close(afd);
child_exit(1);
}
sp = read_startup_packet(cp);
if (sp == NULL)
{
/* failed to read the startup packet. return to the accept() loop */
pool_close(cp);
child_exit(1);
}
pool_debug("do_accept: send error message to frontend");
if (sp->major == PROTO_MAJOR_V3)
{
char buf[256];
if (SYSDB_STATUS == CON_DOWN)
snprintf(buf, sizeof(buf), "SystemDB is down");
else
snprintf(buf, sizeof(buf), "%d th backend is down", i);
pool_send_error_message(cp, sp->major, "08S01",
msg,
buf,
((SYSDB_STATUS == CON_DOWN) ? "repair the SystemDB and restart pgpool"
: "repair the backend and restart pgpool"),
__FILE__,
__LINE__);
}
else
{
pool_send_error_message(cp, sp->major,
0,
msg,
"",
"",
"",
0);
}
pool_close(cp);
child_exit(1);
}
}
}
else
{
/*
* do not accept new connection if all DB nodes are down when operating in
* non parallel mode
*/
int i;
int found = 0;
for (i=0;i<NUM_BACKENDS;i++)
{
if (VALID_BACKEND(i))
{
found = 1;
}
}
if (found == 0)
{
pool_log("Cannot accept() new connection. all backends are down");
child_exit(1);
}
}
pool_debug("I am %d accept fd %d", getpid(), afd);
pool_getnameinfo_all(&saddr, remote_host, remote_port);
snprintf(remote_ps_data, sizeof(remote_ps_data),
remote_port[0] == '\0' ? "%s" : "%s(%s)",
remote_host, remote_port);
set_ps_display("accept connection", false);
/* log who is connecting */
if (pool_config->log_connections)
{
pool_log("connection received: host=%s%s%s",
remote_host, remote_port[0] ? " port=" : "", remote_port);
}
/* set NODELAY and KEEPALIVE options if INET connection */
if (inet)
{
int on = 1;
if (setsockopt(afd, IPPROTO_TCP, TCP_NODELAY,
(char *) &on,
sizeof(on)) < 0)
{
pool_error("do_accept: setsockopt() failed: %s", strerror(errno));
close(afd);
return NULL;
}
if (setsockopt(afd, SOL_SOCKET, SO_KEEPALIVE,
(char *) &on,
sizeof(on)) < 0)
{
pool_error("do_accept: setsockopt() failed: %s", strerror(errno));
close(afd);
return NULL;
}
}
if ((cp = pool_open(afd)) == NULL)
{
close(afd);
return NULL;
}
/* save ip address for hba */
memcpy(&cp->raddr, &saddr, sizeof(SockAddr));
if (cp->raddr.addr.ss_family == 0)
cp->raddr.addr.ss_family = AF_UNIX;
return cp;
}
/*
* pgpool main program
*/
int main(int argc, char **argv)
{
int opt;
int i;
int pid;
int size;
int retrycnt;
int sys_retrycnt;
myargc = argc;
myargv = argv;
snprintf(conf_file, sizeof(conf_file), "%s/%s", DEFAULT_CONFIGDIR, POOL_CONF_FILE_NAME);
snprintf(pcp_conf_file, sizeof(pcp_conf_file), "%s/%s", DEFAULT_CONFIGDIR, PCP_PASSWD_FILE_NAME);
snprintf(hba_file, sizeof(hba_file), "%s/%s", DEFAULT_CONFIGDIR, HBA_CONF_FILE_NAME);
while ((opt = getopt(argc, argv, "a:cdf:F:hm:nv")) != -1)
{
switch (opt)
{
case 'a': /* specify hba configuration file */
if (!optarg)
{
usage();
exit(1);
}
strncpy(hba_file, optarg, sizeof(hba_file));
break;
case 'c': /* clear cache option */
clear_cache = 1;
break;
case 'd': /* debug option */
debug = 1;
break;
case 'f': /* specify configuration file */
if (!optarg)
{
usage();
exit(1);
}
strncpy(conf_file, optarg, sizeof(conf_file));
break;
case 'F': /* specify PCP password file */
if (!optarg)
{
usage();
exit(1);
}
strncpy(pcp_conf_file, optarg, sizeof(pcp_conf_file));
break;
case 'h':
usage();
exit(0);
break;
case 'm': /* stop mode */
if (!optarg)
{
usage();
exit(1);
}
if (*optarg == 's' || !strcmp("smart", optarg))
stop_sig = SIGTERM; /* smart shutdown */
else if (*optarg == 'f' || !strcmp("fast", optarg))
stop_sig = SIGINT; /* fast shutdown */
else if (*optarg == 'i' || !strcmp("immediate", optarg))
stop_sig = SIGQUIT; /* immediate shutdown */
else
{
usage();
exit(1);
}
break;
case 'n': /* no detaching control ttys */
not_detach = 1;
break;
case 'v':
show_version();
exit(0);
default:
usage();
exit(1);
}
}
mypid = getpid();
if (pool_init_config())
exit(1);
if (pool_get_config(conf_file, INIT_CONFIG))
{
pool_error("Unable to get configuration. Exiting...");
exit(1);
}
if (pool_config->enable_pool_hba)
load_hba(hba_file);
/*
* If a non-switch argument remains, then it should be either "reload" or "stop".
*/
if (optind == (argc - 1))
{
if (!strcmp(argv[optind], "reload"))
{
pid_t pid;
pid = read_pid_file();
if (pid < 0)
{
pool_error("could not read pid file");
pool_shmem_exit(1);
exit(1);
}
if (kill(pid, SIGHUP) == -1)
{
pool_error("could not reload configuration file pid: %d. reason: %s", pid, strerror(errno));
pool_shmem_exit(1);
exit(1);
}
pool_shmem_exit(0);
exit(0);
}
if (!strcmp(argv[optind], "stop"))
{
stop_me();
pool_shmem_exit(0);
exit(0);
}
else
{
usage();
pool_shmem_exit(1);
exit(1);
}
}
/*
* else if no non-switch argument remains, then it should be a start request
*/
else if (optind == argc)
{
pid = read_pid_file();
if (pid > 0)
{
if (kill(pid, 0) == 0)
{
fprintf(stderr, "pid file found. is another pgpool(%d) is running?\n", pid);
exit(1);
}
else
fprintf(stderr, "pid file found but it seems bogus. Trying to start pgpool anyway...\n");
}
}
/*
* otherwise an error...
*/
else
{
usage();
exit(1);
}
/* set signal masks */
poolinitmask();
if (not_detach)
write_pid_file();
else
daemonize();
if (pool_semaphore_create(MAX_NUM_SEMAPHORES))
{
pool_error("Unable to create semaphores. Exiting...");
pool_shmem_exit(1);
exit(1);
}
/*
* Restore previous backend status if possible
*/
read_status_file();
/* clear cache */
if (clear_cache && pool_config->enable_query_cache && SYSDB_STATUS == CON_UP)
{
Interval interval[1];
interval[0].quantity = 0;
interval[0].unit = second;
pool_clear_cache_by_time(interval, 1);
}
/* set unix domain socket path */
snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/.s.PGSQL.%d",
pool_config->socket_dir,
pool_config->port);
/* set up signal handlers */
pool_signal(SIGPIPE, SIG_IGN);
/* create unix domain socket */
unix_fd = create_unix_domain_socket(un_addr);
/* create inet domain socket if any */
if (pool_config->listen_addresses[0])
{
inet_fd = create_inet_domain_socket(pool_config->listen_addresses, pool_config->port);
}
size = pool_config->num_init_children * pool_config->max_pool * sizeof(ConnectionInfo);
con_info = pool_shared_memory_create(size);
if (con_info == NULL)
{
pool_error("failed to allocate connection informations");
myexit(1);
}
memset(con_info, 0, size);
size = pool_config->num_init_children * (sizeof(ProcessInfo));
pids = pool_shared_memory_create(size);
if (pids == NULL)
{
pool_error("failed to allocate pids");
myexit(1);
}
memset(pids, 0, size);
for (i = 0; i < pool_config->num_init_children; i++)
{
pids[i].connection_info = &con_info[i * pool_config->max_pool];
}
/* create fail over/switch over event area */
Req_info = pool_shared_memory_create(sizeof(POOL_REQUEST_INFO));
if (Req_info == NULL)
{
pool_error("failed to allocate Req_info");
myexit(1);
}
/* initialize Req_info */
Req_info->kind = NODE_UP_REQUEST;
memset(Req_info->node_id, -1, sizeof(int) * MAX_NUM_BACKENDS);
Req_info->master_node_id = get_next_master_node();
Req_info->conn_counter = 0;
InRecovery = pool_shared_memory_create(sizeof(int));
if (InRecovery == NULL)
{
pool_error("failed to allocate InRecovery");
myexit(1);
}
*InRecovery = 0;
/*
* We need to block signal here. Otherwise child might send some
* signals, for example SIGUSR1(fail over). Children will inherit
* signal blocking but they do unblock signals at the very beginning
* of process. So this is harmless.
*/
POOL_SETMASK(&BlockSig);
/* fork the children */
for (i=0;i<pool_config->num_init_children;i++)
{
pids[i].pid = fork_a_child(unix_fd, inet_fd, i);
pids[i].start_time = time(NULL);
}
/* set up signal handlers */
pool_signal(SIGTERM, exit_handler);
pool_signal(SIGINT, exit_handler);
pool_signal(SIGQUIT, exit_handler);
pool_signal(SIGCHLD, reap_handler);
pool_signal(SIGUSR1, failover_handler);
pool_signal(SIGUSR2, wakeup_handler);
pool_signal(SIGHUP, reload_config_handler);
/* create pipe for delivering event */
if (pipe(pipe_fds) < 0)
{
pool_error("failed to create pipe");
myexit(1);
}
pool_log("pgpool successfully started");
/* fork a child for PCP handling */
snprintf(pcp_un_addr.sun_path, sizeof(pcp_un_addr.sun_path), "%s/.s.PGSQL.%d",
pool_config->pcp_socket_dir,
pool_config->pcp_port);
pcp_unix_fd = create_unix_domain_socket(pcp_un_addr);
/* maybe change "*" to pool_config->pcp_listen_addresses */
pcp_inet_fd = create_inet_domain_socket("*", pool_config->pcp_port);
pcp_pid = pcp_fork_a_child(pcp_unix_fd, pcp_inet_fd, pcp_conf_file);
retrycnt = 0; /* reset health check retry counter */
sys_retrycnt = 0; /* reset SystemDB health check retry counter */
/*
* This is the main loop
*/
for (;;)
{
CHECK_REQUEST;
/* do we need health checking for PostgreSQL? */
if (pool_config->health_check_period > 0)
{
int sts;
int sys_sts = 0;
unsigned int sleep_time;
if (retrycnt == 0)
{
pool_debug("starting health checking");
}
else
{
pool_debug("retrying %d th health checking", retrycnt);
}
if (pool_config->health_check_timeout > 0)
{
/*
* set health checker timeout. we want to detect
* communication path failure much earlier before
* TCP/IP stack detects it.
*/
pool_signal(SIGALRM, health_check_timer_handler);
alarm(pool_config->health_check_timeout);
}
/*
* do actual health check. trying to connect to the backend
*/
errno = 0;
health_check_timer_expired = 0;
POOL_SETMASK(&UnBlockSig);
sts = health_check();
POOL_SETMASK(&BlockSig);
if (pool_config->parallel_mode || pool_config->enable_query_cache)
sys_sts = system_db_health_check();
if ((sts > 0 || sys_sts < 0) && (errno != EINTR || (errno == EINTR && health_check_timer_expired)))
{
if (sts > 0)
{
sts--;
if (!pool_config->parallel_mode)
{
pool_log("set %d th backend down status", sts);
Req_info->kind = NODE_DOWN_REQUEST;
Req_info->node_id[0] = sts;
failover();
/* need to distribute this info to children */
}
else
{
retrycnt++;
pool_signal(SIGALRM, SIG_IGN); /* Cancel timer */
if (retrycnt > NUM_BACKENDS)
{
/* retry count over */
pool_log("set %d th backend down status", sts);
Req_info->kind = NODE_DOWN_REQUEST;
Req_info->node_id[0] = sts;
failover();
retrycnt = 0;
}
else
{
/* continue to retry */
sleep_time = pool_config->health_check_period/NUM_BACKENDS;
pool_debug("retry sleep time: %d seconds", sleep_time);
pool_sleep(sleep_time);
continue;
}
}
}
if (sys_sts < 0)
{
sys_retrycnt++;
pool_signal(SIGALRM, SIG_IGN);
if (sys_retrycnt > NUM_BACKENDS)
{
pool_log("set SystemDB down status");
SYSDB_STATUS = CON_DOWN;
sys_retrycnt = 0;
}
else if (sts == 0) /* goes to sleep only when SystemDB alone was down */
{
sleep_time = pool_config->health_check_period/NUM_BACKENDS;
pool_debug("retry sleep time: %d seconds", sleep_time);
pool_sleep(sleep_time);
continue;
}
}
}
if (pool_config->health_check_timeout > 0)
{
/* seems ok. cancel health check timer */
pool_signal(SIGALRM, SIG_IGN);
}
sleep_time = pool_config->health_check_period;
pool_sleep(sleep_time);
}
else
{
for (;;)
{
int r;
struct timeval t = {3, 0};
POOL_SETMASK(&UnBlockSig);
r = pool_pause(&t);
POOL_SETMASK(&BlockSig);
if (r > 0)
break;
}
}
}
pool_shmem_exit(0);
}
