Line data Source code
1 : /*
2 : Unix SMB/Netbios implementation.
3 : Version 3.0
4 : printing backend routines
5 : Copyright (C) Andrew Tridgell 1992-2000
6 : Copyright (C) Jeremy Allison 2002
7 : Copyright (C) Simo Sorce 2011
8 :
9 : This program is free software; you can redistribute it and/or modify
10 : it under the terms of the GNU General Public License as published by
11 : the Free Software Foundation; either version 3 of the License, or
12 : (at your option) any later version.
13 :
14 : This program is distributed in the hope that it will be useful,
15 : but WITHOUT ANY WARRANTY; without even the implied warranty of
16 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 : GNU General Public License for more details.
18 :
19 : You should have received a copy of the GNU General Public License
20 : along with this program. If not, see <http://www.gnu.org/licenses/>.
21 : */
22 :
23 : #include "includes.h"
24 : #include <spawn.h>
25 : #include "smbd/globals.h"
26 : #include "include/messages.h"
27 : #include "lib/util/util_process.h"
28 : #include "lib/util/sys_rw.h"
29 : #include "printing.h"
30 : #include "printing/pcap.h"
31 : #include "printing/printer_list.h"
32 : #include "printing/queue_process.h"
33 : #include "locking/proto.h"
34 : #include "locking/share_mode_lock.h"
35 : #include "smbd/smbd.h"
36 : #include "rpc_server/rpc_config.h"
37 : #include "printing/load.h"
38 : #include "rpc_server/spoolss/srv_spoolss_nt.h"
39 : #include "auth.h"
40 : #include "nt_printing.h"
41 : #include "util_event.h"
42 : #include "lib/global_contexts.h"
43 : #include "lib/util/pidfile.h"
44 :
45 : /**
46 : * @brief Purge stale printers and reload from pre-populated pcap cache.
47 : *
48 : * This function should normally only be called as a callback on a successful
49 : * pcap_cache_reload().
50 : *
51 : * This function can cause DELETION of printers and drivers from our registry,
52 : * so calling it on a failed pcap reload may REMOVE permanently all printers
53 : * and drivers.
54 : *
55 : * @param[in] ev The event context.
56 : *
57 : * @param[in] msg_ctx The messaging context.
58 : */
59 2 : static void delete_and_reload_printers_full(struct tevent_context *ev,
60 : struct messaging_context *msg_ctx)
61 : {
62 2 : struct auth_session_info *session_info = NULL;
63 2 : struct spoolss_PrinterInfo2 *pinfo2 = NULL;
64 1 : const struct loadparm_substitution *lp_sub =
65 1 : loadparm_s3_global_substitution();
66 : int n_services;
67 : int pnum;
68 : int snum;
69 : const char *pname;
70 : const char *sname;
71 : NTSTATUS status;
72 :
73 2 : n_services = lp_numservices();
74 2 : pnum = lp_servicenumber(PRINTERS_NAME);
75 :
76 2 : status = make_session_info_system(talloc_tos(), &session_info);
77 2 : if (!NT_STATUS_IS_OK(status)) {
78 0 : DEBUG(3, ("reload_printers: "
79 : "Could not create system session_info\n"));
80 : /* can't remove stale printers before we
81 : * are fully initialized */
82 0 : return;
83 : }
84 :
85 : /*
86 : * Add default config for printers added to smb.conf file and remove
87 : * stale printers
88 : */
89 2 : for (snum = 0; snum < n_services; snum++) {
90 : /* avoid removing PRINTERS_NAME */
91 0 : if (snum == pnum) {
92 0 : continue;
93 : }
94 :
95 : /* skip no-printer services */
96 0 : if (!snum_is_shared_printer(snum)) {
97 0 : continue;
98 : }
99 :
100 0 : sname = lp_const_servicename(snum);
101 0 : pname = lp_printername(session_info, lp_sub, snum);
102 :
103 : /* check printer, but avoid removing non-autoloaded printers */
104 0 : if (lp_autoloaded(snum) &&
105 0 : !printer_list_printername_exists(pname)) {
106 0 : DEBUG(3, ("removing stale printer %s\n", pname));
107 :
108 0 : if (is_printer_published(session_info, session_info,
109 : msg_ctx,
110 : NULL,
111 0 : lp_servicename(session_info,
112 : lp_sub,
113 : snum),
114 : &pinfo2)) {
115 0 : nt_printer_publish(session_info,
116 : session_info,
117 : msg_ctx,
118 : pinfo2,
119 : DSPRINT_UNPUBLISH);
120 0 : TALLOC_FREE(pinfo2);
121 : }
122 0 : nt_printer_remove(session_info, session_info, msg_ctx,
123 : pname);
124 : } else {
125 0 : DEBUG(8, ("Adding default registry entry for printer "
126 : "[%s], if it doesn't exist.\n", sname));
127 0 : nt_printer_add(session_info, session_info, msg_ctx,
128 : sname);
129 : }
130 : }
131 :
132 : /* finally, purge old snums */
133 2 : delete_and_reload_printers();
134 :
135 2 : TALLOC_FREE(session_info);
136 : }
137 :
138 :
139 : /****************************************************************************
140 : Notify smbds of new printcap data
141 : **************************************************************************/
142 2 : static void reload_pcap_change_notify(struct tevent_context *ev,
143 : struct messaging_context *msg_ctx)
144 : {
145 : /*
146 : * Reload the printers first in the background process so that
147 : * newly added printers get default values created in the registry.
148 : *
149 : * This will block the process for some time (~1 sec per printer), but
150 : * it doesn't block smbd's serving clients.
151 : */
152 2 : delete_and_reload_printers_full(ev, msg_ctx);
153 :
154 2 : messaging_send_all(msg_ctx, MSG_PRINTER_PCAP, NULL, 0);
155 2 : }
156 :
157 : struct bq_state {
158 : struct tevent_context *ev;
159 : struct messaging_context *msg;
160 : struct idle_event *housekeep;
161 : struct tevent_signal *sighup_handler;
162 : struct tevent_signal *sigchld_handler;
163 : };
164 :
165 0 : static bool print_queue_housekeeping(const struct timeval *now, void *pvt)
166 : {
167 : struct bq_state *state;
168 :
169 0 : state = talloc_get_type_abort(pvt, struct bq_state);
170 :
171 0 : DEBUG(5, ("print queue housekeeping\n"));
172 0 : pcap_cache_reload(state->ev, state->msg, reload_pcap_change_notify);
173 :
174 0 : return true;
175 : }
176 :
177 2 : static bool printing_subsystem_queue_tasks(struct bq_state *state)
178 : {
179 2 : uint32_t housekeeping_period = lp_printcap_cache_time();
180 :
181 : /* cancel any existing housekeeping event */
182 2 : TALLOC_FREE(state->housekeep);
183 :
184 2 : if ((housekeeping_period == 0) || !lp_load_printers()) {
185 0 : DEBUG(4, ("background print queue housekeeping disabled\n"));
186 0 : return true;
187 : }
188 :
189 2 : state->housekeep = event_add_idle(state->ev, NULL,
190 : timeval_set(housekeeping_period, 0),
191 : "print_queue_housekeeping",
192 : print_queue_housekeeping, state);
193 2 : if (state->housekeep == NULL) {
194 0 : DEBUG(0,("Could not add print_queue_housekeeping event\n"));
195 0 : return false;
196 : }
197 :
198 2 : return true;
199 : }
200 :
201 0 : static void bq_reopen_logs(char *logfile)
202 : {
203 0 : if (logfile) {
204 0 : lp_set_logfile(logfile);
205 : }
206 0 : reopen_logs();
207 0 : }
208 :
209 0 : static void bq_sig_hup_handler(struct tevent_context *ev,
210 : struct tevent_signal *se,
211 : int signum,
212 : int count,
213 : void *siginfo,
214 : void *pvt)
215 : {
216 : struct bq_state *state;
217 :
218 0 : state = talloc_get_type_abort(pvt, struct bq_state);
219 0 : change_to_root_user();
220 :
221 0 : DEBUG(1, ("Reloading pcap cache after SIGHUP\n"));
222 0 : pcap_cache_reload(state->ev, state->msg,
223 : reload_pcap_change_notify);
224 0 : printing_subsystem_queue_tasks(state);
225 0 : bq_reopen_logs(NULL);
226 0 : }
227 :
228 0 : static void bq_sig_chld_handler(struct tevent_context *ev_ctx,
229 : struct tevent_signal *se,
230 : int signum, int count,
231 : void *siginfo, void *pvt)
232 : {
233 : int status;
234 : pid_t pid;
235 :
236 : do {
237 : do {
238 0 : pid = waitpid(-1, &status, WNOHANG);
239 0 : } while ((pid == -1) && (errno == EINTR));
240 :
241 0 : if (WIFEXITED(status)) {
242 0 : DBG_INFO("Bq child process %d terminated with %d\n",
243 : (int)pid,
244 : WEXITSTATUS(status));
245 : } else {
246 0 : DBG_NOTICE("Bq child process %d terminated abnormally\n",
247 : (int)pid);
248 : }
249 0 : } while (pid > 0);
250 0 : }
251 :
252 0 : static void bq_smb_conf_updated(struct messaging_context *msg_ctx,
253 : void *private_data,
254 : uint32_t msg_type,
255 : struct server_id server_id,
256 : DATA_BLOB *data)
257 : {
258 : struct bq_state *state;
259 :
260 0 : state = talloc_get_type_abort(private_data, struct bq_state);
261 :
262 0 : DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
263 : "updated. Reloading.\n"));
264 0 : change_to_root_user();
265 0 : pcap_cache_reload(state->ev, msg_ctx, reload_pcap_change_notify);
266 0 : printing_subsystem_queue_tasks(state);
267 0 : }
268 :
269 2 : static int bq_state_destructor(struct bq_state *s)
270 : {
271 2 : struct messaging_context *msg_ctx = s->msg;
272 2 : TALLOC_FREE(s->sighup_handler);
273 2 : TALLOC_FREE(s->sigchld_handler);
274 2 : messaging_deregister(msg_ctx, MSG_PRINTER_DRVUPGRADE, NULL);
275 2 : messaging_deregister(msg_ctx, MSG_PRINTER_UPDATE, NULL);
276 2 : messaging_deregister(msg_ctx, MSG_SMB_CONF_UPDATED, s);
277 2 : return 0;
278 : }
279 :
280 2 : struct bq_state *register_printing_bq_handlers(
281 : TALLOC_CTX *mem_ctx,
282 : struct messaging_context *msg_ctx)
283 : {
284 2 : struct bq_state *state = NULL;
285 : NTSTATUS status;
286 : bool ok;
287 :
288 2 : state = talloc_zero(mem_ctx, struct bq_state);
289 2 : if (state == NULL) {
290 0 : return NULL;
291 : }
292 2 : state->ev = messaging_tevent_context(msg_ctx);
293 2 : state->msg = msg_ctx;
294 :
295 2 : status = messaging_register(
296 : msg_ctx, state, MSG_SMB_CONF_UPDATED, bq_smb_conf_updated);
297 2 : if (!NT_STATUS_IS_OK(status)) {
298 0 : goto fail;
299 : }
300 2 : status = messaging_register(
301 : msg_ctx, NULL, MSG_PRINTER_UPDATE, print_queue_receive);
302 2 : if (!NT_STATUS_IS_OK(status)) {
303 0 : goto fail_dereg_smb_conf_updated;
304 : }
305 2 : status = messaging_register(
306 : msg_ctx, NULL, MSG_PRINTER_DRVUPGRADE, do_drv_upgrade_printer);
307 2 : if (!NT_STATUS_IS_OK(status)) {
308 0 : goto fail_dereg_printer_update;
309 : }
310 :
311 2 : state->sighup_handler = tevent_add_signal(
312 : state->ev, state, SIGHUP, 0, bq_sig_hup_handler, state);
313 2 : if (state->sighup_handler == NULL) {
314 0 : goto fail_dereg_printer_drvupgrade;
315 : }
316 2 : state->sigchld_handler = tevent_add_signal(
317 : state->ev, state, SIGCHLD, 0, bq_sig_chld_handler, NULL);
318 2 : if (state->sigchld_handler == NULL) {
319 0 : goto fail_free_handlers;
320 : }
321 :
322 : /* Initialize the printcap cache as soon as the daemon starts. */
323 2 : pcap_cache_reload(state->ev, state->msg, reload_pcap_change_notify);
324 :
325 2 : ok = printing_subsystem_queue_tasks(state);
326 2 : if (!ok) {
327 0 : goto fail_free_handlers;
328 : }
329 :
330 2 : talloc_set_destructor(state, bq_state_destructor);
331 :
332 2 : return state;
333 :
334 0 : fail_free_handlers:
335 0 : TALLOC_FREE(state->sighup_handler);
336 0 : TALLOC_FREE(state->sigchld_handler);
337 0 : fail_dereg_printer_drvupgrade:
338 0 : messaging_deregister(msg_ctx, MSG_PRINTER_DRVUPGRADE, NULL);
339 0 : fail_dereg_printer_update:
340 0 : messaging_deregister(msg_ctx, MSG_PRINTER_UPDATE, NULL);
341 0 : fail_dereg_smb_conf_updated:
342 0 : messaging_deregister(msg_ctx, MSG_SMB_CONF_UPDATED, state);
343 0 : fail:
344 0 : TALLOC_FREE(state);
345 0 : return NULL;
346 : }
347 :
348 : /****************************************************************************
349 : main thread of the background lpq updater
350 : ****************************************************************************/
351 2 : pid_t start_background_queue(struct tevent_context *ev,
352 : struct messaging_context *msg_ctx,
353 : char *logfile)
354 : {
355 : pid_t pid;
356 : int ret;
357 : ssize_t nread;
358 2 : char **argv = NULL;
359 : int ready_fds[2];
360 :
361 2 : DEBUG(3,("start_background_queue: Starting background LPQ thread\n"));
362 :
363 2 : ret = pipe(ready_fds);
364 2 : if (ret == -1) {
365 0 : return -1;
366 : }
367 :
368 2 : argv = str_list_make_empty(talloc_tos());
369 2 : str_list_add_printf(
370 : &argv, "%s/samba-bgqd", get_dyn_SAMBA_LIBEXECDIR());
371 2 : str_list_add_printf(
372 : &argv, "--ready-signal-fd=%d", ready_fds[1]);
373 2 : str_list_add_printf(
374 : &argv, "--parent-watch-fd=%d", 0);
375 2 : str_list_add_printf(
376 : &argv, "--debuglevel=%d", debuglevel_get_class(DBGC_RPC_SRV));
377 2 : if (!is_default_dyn_CONFIGFILE()) {
378 2 : str_list_add_printf(
379 : &argv, "--configfile=%s", get_dyn_CONFIGFILE());
380 : }
381 2 : if (!is_default_dyn_LOGFILEBASE()) {
382 2 : str_list_add_printf(
383 : &argv, "--log-basename=%s", get_dyn_LOGFILEBASE());
384 : }
385 2 : str_list_add_printf(&argv, "-F");
386 2 : if (argv == NULL) {
387 0 : goto nomem;
388 : }
389 :
390 2 : ret = posix_spawn(&pid, argv[0], NULL, NULL, argv, environ);
391 2 : if (ret == -1) {
392 0 : goto fail;
393 : }
394 2 : TALLOC_FREE(argv);
395 :
396 2 : close(ready_fds[1]);
397 :
398 2 : nread = sys_read(ready_fds[0], &pid, sizeof(pid));
399 2 : close(ready_fds[0]);
400 2 : if (nread != sizeof(pid)) {
401 0 : goto fail;
402 : }
403 :
404 2 : return pid;
405 :
406 0 : nomem:
407 0 : errno = ENOMEM;
408 0 : fail:
409 : {
410 0 : int err = errno;
411 0 : TALLOC_FREE(argv);
412 0 : errno = err;
413 : }
414 :
415 0 : return -1;
416 : }
417 :
418 :
419 : /* Run before the parent forks */
420 2 : bool printing_subsystem_init(struct tevent_context *ev_ctx,
421 : struct messaging_context *msg_ctx,
422 : struct dcesrv_context *dce_ctx)
423 : {
424 2 : pid_t pid = -1;
425 :
426 2 : pid = start_background_queue(NULL, NULL, NULL);
427 2 : if (pid == -1) {
428 0 : return false;
429 : }
430 2 : background_lpq_updater_pid = pid;
431 :
432 2 : if (!print_backend_init(msg_ctx)) {
433 0 : return false;
434 : }
435 :
436 2 : return true;
437 : }
438 :
439 0 : void send_to_bgqd(struct messaging_context *msg_ctx,
440 : uint32_t msg_type,
441 : const uint8_t *buf,
442 : size_t buflen)
443 : {
444 0 : pid_t bgqd = pidfile_pid(lp_pid_directory(), "samba-bgqd");
445 :
446 0 : if (bgqd == -1) {
447 0 : return;
448 : }
449 0 : messaging_send_buf(
450 : msg_ctx, pid_to_procid(bgqd), msg_type, buf, buflen);
451 : }
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