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|
/*
Unix SMB/Netbios implementation.
SPOOLSS Daemon
Copyright (C) Simo Sorce <idra@samba.org> 2010-2011
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 "serverid.h"
#include "smbd/smbd.h"
#include "messages.h"
#include "include/printing.h"
#include "printing/nt_printing_migrate_internal.h"
#include "printing/queue_process.h"
#include "printing/pcap.h"
#include "printing/load.h"
#include "ntdomain.h"
#include "librpc/gen_ndr/srv_winreg.h"
#include "librpc/gen_ndr/srv_spoolss.h"
#include "rpc_server/rpc_server.h"
#include "rpc_server/rpc_ep_register.h"
#include "rpc_server/spoolss/srv_spoolss_nt.h"
#include "librpc/rpc/dcerpc_ep.h"
#include "lib/server_prefork.h"
#include "lib/server_prefork_util.h"
#define SPOOLSS_PIPE_NAME "spoolss"
#define DAEMON_NAME "spoolssd"
static struct server_id parent_id;
static struct prefork_pool *spoolss_pool = NULL;
static int spoolss_child_id = 0;
static struct pf_daemon_config default_pf_spoolss_cfg = {
.prefork_status = PFH_INIT,
.min_children = 5,
.max_children = 25,
.spawn_rate = 5,
.max_allowed_clients = 100,
.child_min_life = 60 /* 1 minute minimum life time */
};
static struct pf_daemon_config pf_spoolss_cfg = { 0 };
pid_t start_spoolssd(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx);
static void spoolss_reopen_logs(int child_id)
{
char *lfile = lp_logfile();
char *ext;
int rc;
if (child_id) {
rc = asprintf(&ext, "%s.%d", DAEMON_NAME, child_id);
} else {
rc = asprintf(&ext, "%s", DAEMON_NAME);
}
if (rc == -1) {
return;
}
rc = 0;
if (lfile == NULL || lfile[0] == '\0') {
rc = asprintf(&lfile, "%s/log.%s",
get_dyn_LOGFILEBASE(), ext);
} else {
if (strstr(lfile, ext) == NULL) {
if (child_id) {
rc = asprintf(&lfile, "%s.%d",
lp_logfile(), child_id);
} else {
rc = asprintf(&lfile, "%s.%s",
lp_logfile(), ext);
}
}
}
if (rc > 0) {
lp_set_logfile(lfile);
SAFE_FREE(lfile);
}
SAFE_FREE(ext);
reopen_logs();
}
static void update_conf(struct tevent_context *ev,
struct messaging_context *msg)
{
change_to_root_user();
lp_load(get_dyn_CONFIGFILE(), true, false, false, true);
load_printers(ev, msg);
spoolss_reopen_logs(spoolss_child_id);
if (spoolss_child_id == 0) {
pfh_daemon_config(DAEMON_NAME,
&pf_spoolss_cfg,
&default_pf_spoolss_cfg);
pfh_manage_pool(ev, msg, &pf_spoolss_cfg, spoolss_pool);
}
}
static void smb_conf_updated(struct messaging_context *msg,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
struct tevent_context);
DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
update_conf(ev_ctx, msg);
}
static void update_pcap(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx)
{
change_to_root_user();
delete_and_reload_printers(ev_ctx, msg_ctx);
}
static void pcap_updated(struct messaging_context *msg,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
struct tevent_context *ev_ctx;
ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
DEBUG(10, ("Got message that pcap updated. Reloading.\n"));
update_pcap(ev_ctx, msg);
}
static void spoolss_sig_term_handler(struct tevent_context *ev,
struct tevent_signal *se,
int signum,
int count,
void *siginfo,
void *private_data)
{
exit_server_cleanly("termination signal");
}
static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
{
struct tevent_signal *se;
se = tevent_add_signal(ev_ctx,
ev_ctx,
SIGTERM, 0,
spoolss_sig_term_handler,
NULL);
if (!se) {
exit_server("failed to setup SIGTERM handler");
}
}
static void spoolss_sig_hup_handler(struct tevent_context *ev,
struct tevent_signal *se,
int signum,
int count,
void *siginfo,
void *pvt)
{
struct messaging_context *msg_ctx;
msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
DEBUG(1,("Reloading printers after SIGHUP\n"));
update_conf(ev, msg_ctx);
/* relay to all children */
if (spoolss_pool) {
prefork_send_signal_to_all(spoolss_pool, SIGHUP);
}
}
static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx)
{
struct tevent_signal *se;
se = tevent_add_signal(ev_ctx,
ev_ctx,
SIGHUP, 0,
spoolss_sig_hup_handler,
msg_ctx);
if (!se) {
exit_server("failed to setup SIGHUP handler");
}
}
static bool spoolss_init_cb(void *ptr)
{
struct messaging_context *msg_ctx = talloc_get_type_abort(
ptr, struct messaging_context);
return nt_printing_tdb_migrate(msg_ctx);
}
static bool spoolss_shutdown_cb(void *ptr)
{
srv_spoolss_cleanup();
return true;
}
/* Children */
static void spoolss_chld_sig_hup_handler(struct tevent_context *ev,
struct tevent_signal *se,
int signum,
int count,
void *siginfo,
void *pvt)
{
struct messaging_context *msg_ctx;
msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
change_to_root_user();
DEBUG(1,("Reloading printers after SIGHUP\n"));
load_printers(ev, msg_ctx);
spoolss_reopen_logs(spoolss_child_id);
}
static bool spoolss_setup_chld_hup_handler(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx,
struct pf_worker_data *pf)
{
struct tevent_signal *se;
se = tevent_add_signal(ev_ctx,
ev_ctx,
SIGHUP, 0,
spoolss_chld_sig_hup_handler,
msg_ctx);
if (!se) {
DEBUG(1, ("failed to setup SIGHUP handler"));
return false;
}
return true;
}
static void parent_ping(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
/* The fact we received this message is enough to let make the event
* loop if it was idle. spoolss_children_main will cycle through
* spoolss_next_client at least once. That function will take whatever
* action is necessary */
DEBUG(10, ("Got message that the parent changed status.\n"));
return;
}
static bool spoolss_child_init(struct tevent_context *ev_ctx,
int child_id, struct pf_worker_data *pf)
{
NTSTATUS status;
struct rpc_srv_callbacks spoolss_cb;
struct messaging_context *msg_ctx = server_messaging_context();
bool ok;
status = reinit_after_fork(msg_ctx, ev_ctx,
true);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("reinit_after_fork() failed\n"));
smb_panic("reinit_after_fork() failed");
}
spoolss_child_id = child_id;
spoolss_reopen_logs(child_id);
ok = spoolss_setup_chld_hup_handler(ev_ctx, msg_ctx, pf);
if (!ok) {
return false;
}
if (!serverid_register(procid_self(),
FLAG_MSG_GENERAL |
FLAG_MSG_PRINT_GENERAL)) {
return false;
}
if (!locking_init()) {
return false;
}
messaging_register(msg_ctx, ev_ctx,
MSG_SMB_CONF_UPDATED, smb_conf_updated);
messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
pcap_updated);
messaging_register(msg_ctx, ev_ctx,
MSG_PREFORK_PARENT_EVENT, parent_ping);
/* As soon as messaging is up check if pcap has been loaded already.
* If so then we probably missed a message and should load_printers()
* ourselves. If pcap has not been loaded yet, then ignore, we will get
* a message as soon as the bq process completes the reload. */
if (pcap_cache_loaded()) {
load_printers(ev_ctx, msg_ctx);
}
/* try to reinit rpc queues */
spoolss_cb.init = spoolss_init_cb;
spoolss_cb.shutdown = spoolss_shutdown_cb;
spoolss_cb.private_data = msg_ctx;
status = rpc_winreg_init(NULL);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
nt_errstr(status)));
return false;
}
status = rpc_spoolss_init(&spoolss_cb);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
nt_errstr(status)));
return false;
}
return true;
}
struct spoolss_children_data {
struct tevent_context *ev_ctx;
struct messaging_context *msg_ctx;
struct pf_worker_data *pf;
int listen_fd_size;
int *listen_fds;
};
static void spoolss_next_client(void *pvt);
static int spoolss_children_main(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx,
struct pf_worker_data *pf,
int child_id,
int listen_fd_size,
int *listen_fds,
void *private_data)
{
struct spoolss_children_data *data;
bool ok;
int ret;
ok = spoolss_child_init(ev_ctx, child_id, pf);
if (!ok) {
return 1;
}
data = talloc(ev_ctx, struct spoolss_children_data);
if (!data) {
return 1;
}
data->pf = pf;
data->ev_ctx = ev_ctx;
data->msg_ctx = msg_ctx;
data->listen_fd_size = listen_fd_size;
data->listen_fds = listen_fds;
/* loop until it is time to exit */
while (pf->status != PF_WORKER_EXITING) {
/* try to see if it is time to schedule the next client */
spoolss_next_client(data);
ret = tevent_loop_once(ev_ctx);
if (ret != 0) {
DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
ret, strerror(errno)));
pf->status = PF_WORKER_EXITING;
}
}
return ret;
}
static void spoolss_client_terminated(void *pvt)
{
struct spoolss_children_data *data;
data = talloc_get_type_abort(pvt, struct spoolss_children_data);
pfh_client_terminated(data->pf);
spoolss_next_client(pvt);
}
struct spoolss_new_client {
struct spoolss_children_data *data;
struct tsocket_address *srv_addr;
struct tsocket_address *cli_addr;
};
static void spoolss_handle_client(struct tevent_req *req);
static void spoolss_next_client(void *pvt)
{
struct tevent_req *req;
struct spoolss_children_data *data;
struct spoolss_new_client *next;
data = talloc_get_type_abort(pvt, struct spoolss_children_data);
if (!pfh_child_allowed_to_accept(data->pf)) {
/* nothing to do for now we are already listening
* or we are not allowed to listen further */
return;
}
next = talloc_zero(data, struct spoolss_new_client);
if (!next) {
DEBUG(1, ("Out of memory!?\n"));
return;
}
next->data = data;
req = prefork_listen_send(next, data->ev_ctx, data->pf,
data->listen_fd_size,
data->listen_fds);
if (!req) {
DEBUG(1, ("Failed to make listening request!?\n"));
talloc_free(next);
return;
}
tevent_req_set_callback(req, spoolss_handle_client, next);
}
static void spoolss_handle_client(struct tevent_req *req)
{
struct spoolss_children_data *data;
struct spoolss_new_client *client;
const DATA_BLOB ping = data_blob_null;
int ret;
int sd;
client = tevent_req_callback_data(req, struct spoolss_new_client);
data = client->data;
ret = prefork_listen_recv(req, client, &sd,
&client->srv_addr, &client->cli_addr);
/* this will free the request too */
talloc_free(client);
if (ret != 0) {
DEBUG(6, ("No client connection was available after all!\n"));
return;
}
/* Warn parent that our status changed */
messaging_send(data->msg_ctx, parent_id,
MSG_PREFORK_CHILD_EVENT, &ping);
DEBUG(2, ("Spoolss preforked child %d got client connection!\n",
(int)(data->pf->pid)));
named_pipe_accept_function(data->ev_ctx, data->msg_ctx,
SPOOLSS_PIPE_NAME, sd,
spoolss_client_terminated, data);
}
/* ==== Main Process Functions ==== */
extern pid_t background_lpq_updater_pid;
static char *bq_logfile;
static void check_updater_child(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx)
{
int status;
pid_t pid;
if (background_lpq_updater_pid == -1) {
return;
}
pid = sys_waitpid(background_lpq_updater_pid, &status, WNOHANG);
if (pid > 0) {
DEBUG(2, ("The background queue child died... Restarting!\n"));
pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
background_lpq_updater_pid = pid;
}
}
static void child_ping(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
struct tevent_context *ev_ctx;
ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
DEBUG(10, ("Got message that a child changed status.\n"));
pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
}
static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx,
struct timeval current_time);
static void spoolssd_check_children(struct tevent_context *ev_ctx,
struct tevent_timer *te,
struct timeval current_time,
void *pvt);
static void spoolssd_sigchld_handler(struct tevent_context *ev_ctx,
struct prefork_pool *pfp,
void *pvt)
{
struct messaging_context *msg_ctx;
msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
/* run pool management so we can fork/retire or increase
* the allowed connections per child based on load */
pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
/* also check if the updater child is alive and well */
check_updater_child(ev_ctx, msg_ctx);
}
static bool spoolssd_setup_children_monitor(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx)
{
bool ok;
/* add our oun sigchld callback */
prefork_set_sigchld_callback(spoolss_pool,
spoolssd_sigchld_handler, msg_ctx);
ok = spoolssd_schedule_check(ev_ctx, msg_ctx,
tevent_timeval_current());
return ok;
}
static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx,
struct timeval current_time)
{
struct tevent_timer *te;
struct timeval next_event;
/* check situation again in 10 seconds */
next_event = tevent_timeval_current_ofs(10, 0);
/* TODO: check when the socket becomes readable, so that children
* are checked only when there is some activity ? */
te = tevent_add_timer(ev_ctx, spoolss_pool, next_event,
spoolssd_check_children, msg_ctx);
if (!te) {
DEBUG(2, ("Failed to set up children monitoring!\n"));
return false;
}
return true;
}
static void spoolssd_check_children(struct tevent_context *ev_ctx,
struct tevent_timer *te,
struct timeval current_time,
void *pvt)
{
struct messaging_context *msg_ctx;
msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
spoolssd_schedule_check(ev_ctx, msg_ctx, current_time);
}
static void print_queue_forward(struct messaging_context *msg,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
messaging_send_buf(msg, pid_to_procid(background_lpq_updater_pid),
MSG_PRINTER_UPDATE, data->data, data->length);
}
static char *get_bq_logfile(void)
{
char *lfile = lp_logfile();
int rc;
if (lfile == NULL || lfile[0] == '\0') {
rc = asprintf(&lfile, "%s/log.%s.bq",
get_dyn_LOGFILEBASE(), DAEMON_NAME);
} else {
rc = asprintf(&lfile, "%s.bq", lp_logfile());
}
if (rc == -1) {
lfile = NULL;
}
return lfile;
}
pid_t start_spoolssd(struct tevent_context *ev_ctx,
struct messaging_context *msg_ctx)
{
struct rpc_srv_callbacks spoolss_cb;
struct dcerpc_binding_vector *v;
TALLOC_CTX *mem_ctx;
pid_t pid;
NTSTATUS status;
int listen_fd;
int ret;
bool ok;
DEBUG(1, ("Forking SPOOLSS Daemon\n"));
/*
* Block signals before forking child as it will have to
* set its own handlers. Child will re-enable SIGHUP as
* soon as the handlers are set up.
*/
BlockSignals(true, SIGTERM);
BlockSignals(true, SIGHUP);
pid = sys_fork();
if (pid == -1) {
DEBUG(0, ("Failed to fork SPOOLSS [%s]\n",
strerror(errno)));
}
/* parent or error */
if (pid != 0) {
/* Re-enable SIGHUP before returnig */
BlockSignals(false, SIGTERM);
BlockSignals(false, SIGHUP);
return pid;
}
/* child */
close_low_fds(false);
status = reinit_after_fork(msg_ctx,
ev_ctx,
true);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0,("reinit_after_fork() failed\n"));
smb_panic("reinit_after_fork() failed");
}
/* save the parent process id so the children can use it later */
parent_id = procid_self();
spoolss_reopen_logs(0);
pfh_daemon_config(DAEMON_NAME,
&pf_spoolss_cfg,
&default_pf_spoolss_cfg);
spoolss_setup_sig_term_handler(ev_ctx);
spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
BlockSignals(false, SIGTERM);
BlockSignals(false, SIGHUP);
/* always start the backgroundqueue listner in spoolssd */
bq_logfile = get_bq_logfile();
pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
if (pid > 0) {
background_lpq_updater_pid = pid;
}
/* the listening fd must be created before the children are actually
* forked out. */
listen_fd = create_named_pipe_socket(SPOOLSS_PIPE_NAME);
if (listen_fd == -1) {
exit(1);
}
ret = listen(listen_fd, pf_spoolss_cfg.max_allowed_clients);
if (ret == -1) {
DEBUG(0, ("Failed to listen on spoolss pipe - %s\n",
strerror(errno)));
exit(1);
}
/* start children before any more initialization is done */
ok = prefork_create_pool(ev_ctx, /* mem_ctx */
ev_ctx, msg_ctx,
1, &listen_fd,
pf_spoolss_cfg.min_children,
pf_spoolss_cfg.max_children,
&spoolss_children_main, NULL,
&spoolss_pool);
if (!ok) {
exit(1);
}
if (!serverid_register(procid_self(),
FLAG_MSG_GENERAL |
FLAG_MSG_PRINT_GENERAL)) {
exit(1);
}
if (!locking_init()) {
exit(1);
}
messaging_register(msg_ctx, ev_ctx,
MSG_SMB_CONF_UPDATED, smb_conf_updated);
messaging_register(msg_ctx, NULL, MSG_PRINTER_UPDATE,
print_queue_forward);
messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
pcap_updated);
messaging_register(msg_ctx, ev_ctx,
MSG_PREFORK_CHILD_EVENT, child_ping);
/* As soon as messaging is up check if pcap has been loaded already.
* If so then we probably missed a message and should load_printers()
* ourselves. If pcap has not been loaded yet, then ignore, we will get
* a message as soon as the bq process completes the reload. */
if (pcap_cache_loaded()) {
load_printers(ev_ctx, msg_ctx);
}
mem_ctx = talloc_new(NULL);
if (mem_ctx == NULL) {
exit(1);
}
/*
* Initialize spoolss with an init function to convert printers first.
* static_init_rpc will try to initialize the spoolss server too but you
* can't register it twice.
*/
spoolss_cb.init = spoolss_init_cb;
spoolss_cb.shutdown = spoolss_shutdown_cb;
spoolss_cb.private_data = msg_ctx;
status = rpc_winreg_init(NULL);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
nt_errstr(status)));
exit(1);
}
status = rpc_spoolss_init(&spoolss_cb);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
nt_errstr(status)));
exit(1);
}
status = dcerpc_binding_vector_new(mem_ctx, &v);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to create binding vector (%s)\n",
nt_errstr(status)));
exit(1);
}
status = dcerpc_binding_vector_add_np_default(&ndr_table_spoolss, v);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to add np to binding vector (%s)\n",
nt_errstr(status)));
exit(1);
}
status = rpc_ep_register(ev_ctx, msg_ctx, &ndr_table_spoolss, v);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
nt_errstr(status)));
exit(1);
}
talloc_free(mem_ctx);
ok = spoolssd_setup_children_monitor(ev_ctx, msg_ctx);
if (!ok) {
DEBUG(0, ("Failed to setup children monitoring!\n"));
exit(1);
}
DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
/* loop forever */
ret = tevent_loop_wait(ev_ctx);
/* should not be reached */
DEBUG(0,("spoolssd tevent_loop_wait() exited with %d - %s\n",
ret, (ret == 0) ? "out of events" : strerror(errno)));
exit(1);
}
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