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samba-mirror/source4/smbd/server.c
Andrew Tridgell cfc0cabb27 prime the sam ldb schema in the parent samba process
While testing the use of the standard process model with 'make test' I
found that testing was much slower (by several times) with the
standard model than with the single model. The primary problem was
that each SMB connection would open a new sam ldb context, and all of
those would reload the full AD schema.

The fix is to pre-open the SAM during server startup, before any child
processes are forked. This sets up the global schema context which is
inherited by all connections.

The standard model is still slower at make test than the single model,
but not by nearly as much. I am working on further reducing the gap.
2009-08-07 17:24:48 +10:00

388 lines
10 KiB
C

/*
Unix SMB/CIFS implementation.
Main SMB server routines
Copyright (C) Andrew Tridgell 1992-2005
Copyright (C) Martin Pool 2002
Copyright (C) Jelmer Vernooij 2002
Copyright (C) James J Myers 2003 <myersjj@samba.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/events/events.h"
#include "version.h"
#include "lib/cmdline/popt_common.h"
#include "system/dir.h"
#include "system/filesys.h"
#include "ldb/include/ldb.h"
#include "registry/registry.h"
#include "ntvfs/ntvfs.h"
#include "ntptr/ntptr.h"
#include "auth/gensec/gensec.h"
#include "smbd/process_model.h"
#include "smbd/service.h"
#include "param/secrets.h"
#include "smbd/pidfile.h"
#include "param/param.h"
#include "dsdb/samdb/samdb.h"
#include "auth/session.h"
/*
recursively delete a directory tree
*/
static void recursive_delete(const char *path)
{
DIR *dir;
struct dirent *de;
dir = opendir(path);
if (!dir) {
return;
}
for (de=readdir(dir);de;de=readdir(dir)) {
char *fname;
struct stat st;
if (ISDOT(de->d_name) || ISDOTDOT(de->d_name)) {
continue;
}
fname = talloc_asprintf(path, "%s/%s", path, de->d_name);
if (stat(fname, &st) != 0) {
continue;
}
if (S_ISDIR(st.st_mode)) {
recursive_delete(fname);
talloc_free(fname);
continue;
}
if (unlink(fname) != 0) {
DEBUG(0,("Unabled to delete '%s' - %s\n",
fname, strerror(errno)));
smb_panic("unable to cleanup tmp files");
}
talloc_free(fname);
}
closedir(dir);
}
/*
cleanup temporary files. This is the new alternative to
TDB_CLEAR_IF_FIRST. Unfortunately TDB_CLEAR_IF_FIRST is not
efficient on unix systems due to the lack of scaling of the byte
range locking system. So instead of putting the burden on tdb to
cleanup tmp files, this function deletes them.
*/
static void cleanup_tmp_files(struct loadparm_context *lp_ctx)
{
char *path;
TALLOC_CTX *mem_ctx = talloc_new(NULL);
path = smbd_tmp_path(mem_ctx, lp_ctx, NULL);
recursive_delete(path);
talloc_free(mem_ctx);
}
static void sig_hup(int sig)
{
debug_schedule_reopen_logs();
}
static void sig_term(int sig)
{
#if HAVE_GETPGRP
static int done_sigterm;
if (done_sigterm == 0 && getpgrp() == getpid()) {
DEBUG(0,("SIGTERM: killing children\n"));
done_sigterm = 1;
kill(-getpgrp(), SIGTERM);
}
#endif
DEBUG(0,("Exiting pid %d on SIGTERM\n", (int)getpid()));
exit(0);
}
/*
setup signal masks
*/
static void setup_signals(void)
{
/* we are never interested in SIGPIPE */
BlockSignals(true,SIGPIPE);
#if defined(SIGFPE)
/* we are never interested in SIGFPE */
BlockSignals(true,SIGFPE);
#endif
/* We are no longer interested in USR1 */
BlockSignals(true, SIGUSR1);
#if defined(SIGUSR2)
/* We are no longer interested in USR2 */
BlockSignals(true,SIGUSR2);
#endif
/* POSIX demands that signals are inherited. If the invoking process has
* these signals masked, we will have problems, as we won't recieve them. */
BlockSignals(false, SIGHUP);
BlockSignals(false, SIGTERM);
CatchSignal(SIGHUP, sig_hup);
CatchSignal(SIGTERM, sig_term);
}
/*
handle io on stdin
*/
static void server_stdin_handler(struct tevent_context *event_ctx, struct tevent_fd *fde,
uint16_t flags, void *private_data)
{
const char *binary_name = (const char *)private_data;
uint8_t c;
if (read(0, &c, 1) == 0) {
DEBUG(0,("%s: EOF on stdin - terminating\n", binary_name));
#if HAVE_GETPGRP
if (getpgrp() == getpid()) {
DEBUG(0,("Sending SIGTERM from pid %d\n", (int)getpid()));
kill(-getpgrp(), SIGTERM);
}
#endif
exit(0);
}
}
/*
die if the user selected maximum runtime is exceeded
*/
_NORETURN_ static void max_runtime_handler(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval t, void *private_data)
{
const char *binary_name = (const char *)private_data;
DEBUG(0,("%s: maximum runtime exceeded - terminating\n", binary_name));
exit(0);
}
/*
pre-open the sam ldb to ensure the schema has been loaded. This
saves a lot of time in child processes
*/
static void prime_samdb_schema(struct tevent_context *event_ctx)
{
TALLOC_CTX *samdb_context;
samdb_context = talloc_new(event_ctx);
samdb_connect(samdb_context, event_ctx, cmdline_lp_ctx, system_session(samdb_context, cmdline_lp_ctx));
talloc_free(samdb_context);
}
/*
main server.
*/
static int binary_smbd_main(const char *binary_name, int argc, const char *argv[])
{
bool opt_daemon = false;
bool opt_interactive = false;
int opt;
poptContext pc;
extern NTSTATUS server_service_wrepl_init(void);
extern NTSTATUS server_service_kdc_init(void);
extern NTSTATUS server_service_ldap_init(void);
extern NTSTATUS server_service_web_init(void);
extern NTSTATUS server_service_ldap_init(void);
extern NTSTATUS server_service_winbind_init(void);
extern NTSTATUS server_service_nbtd_init(void);
extern NTSTATUS server_service_auth_init(void);
extern NTSTATUS server_service_cldapd_init(void);
extern NTSTATUS server_service_smb_init(void);
extern NTSTATUS server_service_drepl_init(void);
extern NTSTATUS server_service_rpc_init(void);
extern NTSTATUS server_service_ntp_signd_init(void);
extern NTSTATUS server_service_samba3_smb_init(void);
init_module_fn static_init[] = { STATIC_service_MODULES };
init_module_fn *shared_init;
struct tevent_context *event_ctx;
uint16_t stdin_event_flags;
NTSTATUS status;
const char *model = "standard";
int max_runtime = 0;
enum {
OPT_DAEMON = 1000,
OPT_INTERACTIVE,
OPT_PROCESS_MODEL
};
struct poptOption long_options[] = {
POPT_AUTOHELP
{"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON,
"Become a daemon (default)", NULL },
{"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE,
"Run interactive (not a daemon)", NULL},
{"model", 'M', POPT_ARG_STRING, NULL, OPT_PROCESS_MODEL,
"Select process model", "MODEL"},
{"maximum-runtime",0, POPT_ARG_INT, &max_runtime, 0,
"set maximum runtime of the server process, till autotermination", "seconds"},
POPT_COMMON_SAMBA
POPT_COMMON_VERSION
{ NULL }
};
pc = poptGetContext(binary_name, argc, argv, long_options, 0);
while((opt = poptGetNextOpt(pc)) != -1) {
switch(opt) {
case OPT_DAEMON:
opt_daemon = true;
break;
case OPT_INTERACTIVE:
opt_interactive = true;
break;
case OPT_PROCESS_MODEL:
model = poptGetOptArg(pc);
break;
default:
fprintf(stderr, "\nInvalid option %s: %s\n\n",
poptBadOption(pc, 0), poptStrerror(opt));
poptPrintUsage(pc, stderr, 0);
exit(1);
}
}
if (opt_daemon && opt_interactive) {
fprintf(stderr,"\nERROR: "
"Option -i|--interactive is not allowed together with -D|--daemon\n\n");
poptPrintUsage(pc, stderr, 0);
exit(1);
} else if (!opt_interactive) {
/* default is --daemon */
opt_daemon = true;
}
poptFreeContext(pc);
setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
setup_signals();
/* we want total control over the permissions on created files,
so set our umask to 0 */
umask(0);
DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2009\n"));
if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4 || sizeof(uint64_t) < 8) {
DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
DEBUGADD(0,("sizeof(uint16_t) = %u, sizeof(uint32_t) %u, sizeof(uint64_t) = %u\n",
(unsigned int)sizeof(uint16_t), (unsigned int)sizeof(uint32_t), (unsigned int)sizeof(uint64_t)));
exit(1);
}
if (opt_daemon) {
DEBUG(3,("Becoming a daemon.\n"));
become_daemon(true, false);
}
cleanup_tmp_files(cmdline_lp_ctx);
if (!directory_exist(lp_lockdir(cmdline_lp_ctx))) {
mkdir(lp_lockdir(cmdline_lp_ctx), 0755);
}
pidfile_create(lp_piddir(cmdline_lp_ctx), binary_name);
/* Do *not* remove this, until you have removed
* passdb/secrets.c, and proved that Samba still builds... */
/* Setup the SECRETS subsystem */
if (secrets_init(talloc_autofree_context(), cmdline_lp_ctx) == NULL) {
exit(1);
}
gensec_init(cmdline_lp_ctx); /* FIXME: */
ntptr_init(cmdline_lp_ctx); /* FIXME: maybe run this in the initialization function
of the spoolss RPC server instead? */
ntvfs_init(cmdline_lp_ctx); /* FIXME: maybe run this in the initialization functions
of the SMB[,2] server instead? */
process_model_init(cmdline_lp_ctx);
shared_init = load_samba_modules(NULL, cmdline_lp_ctx, "service");
run_init_functions(static_init);
run_init_functions(shared_init);
talloc_free(shared_init);
/* the event context is the top level structure in smbd. Everything else
should hang off that */
event_ctx = s4_event_context_init(talloc_autofree_context());
if (event_ctx == NULL) {
DEBUG(0,("Initializing event context failed\n"));
return 1;
}
if (opt_interactive) {
/* terminate when stdin goes away */
stdin_event_flags = TEVENT_FD_READ;
} else {
/* stay alive forever */
stdin_event_flags = 0;
}
/* catch EOF on stdin */
#ifdef SIGTTIN
signal(SIGTTIN, SIG_IGN);
#endif
tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
server_stdin_handler,
discard_const(binary_name));
if (max_runtime) {
tevent_add_timer(event_ctx, event_ctx,
timeval_current_ofs(max_runtime, 0),
max_runtime_handler,
discard_const(binary_name));
}
prime_samdb_schema(event_ctx);
DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
lp_server_services(cmdline_lp_ctx));
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("Starting Services failed - %s\n", nt_errstr(status)));
return 1;
}
/* wait for events - this is where smbd sits for most of its
life */
tevent_loop_wait(event_ctx);
/* as everything hangs off this event context, freeing it
should initiate a clean shutdown of all services */
talloc_free(event_ctx);
return 0;
}
int main(int argc, const char *argv[])
{
return binary_smbd_main("samba", argc, argv);
}