1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
23  * Copyright 2012 Nexenta Systems, Inc.  All rights reserved.
24  */
25 
26 /*
27  * CUPS support for the SMB and SPOOLSS print services.
28  */
29 
30 #include <sys/types.h>
31 #include <sys/stat.h>
32 #include <sys/atomic.h>
33 #include <strings.h>
34 #include <syslog.h>
35 #include <signal.h>
36 #include <pthread.h>
37 #include <synch.h>
38 #include <dlfcn.h>
39 #include <errno.h>
40 #include <smbsrv/smb.h>
41 #include <smbsrv/smb_share.h>
42 #include "smbd.h"
43 
44 #ifdef	HAVE_CUPS
45 #include <cups/cups.h>
46 
47 #define	SMB_SPOOL_WAIT			2
48 #define	SMBD_PJOBLEN			256
49 #define	SMBD_PRINTER			"Postscript"
50 #define	SMBD_FN_PREFIX			"cifsprintjob-"
51 #define	SMBD_CUPS_SPOOL_DIR		"//var//spool//cups"
52 #define	SMBD_CUPS_DOCNAME		"generic_doc"
53 
54 typedef struct smbd_printjob {
55 	pid_t		pj_pid;
56 	int		pj_sysjob;
57 	int		pj_fd;
58 	time_t		pj_start_time;
59 	int		pj_status;
60 	size_t		pj_size;
61 	int		pj_page_count;
62 	boolean_t	pj_isspooled;
63 	boolean_t	pj_jobnum;
64 	char		pj_filename[SMBD_PJOBLEN];
65 	char		pj_jobname[SMBD_PJOBLEN];
66 	char		pj_username[SMBD_PJOBLEN];
67 	char		pj_queuename[SMBD_PJOBLEN];
68 } smbd_printjob_t;
69 
70 typedef struct smb_cups_ops {
71 	void		*cups_hdl;
72 	cups_lang_t	*(*cupsLangDefault)();
73 	const char	*(*cupsLangEncoding)(cups_lang_t *);
74 	void		(*cupsLangFree)(cups_lang_t *);
75 	ipp_status_t	(*cupsLastError)();
76 	int		(*cupsGetDests)(cups_dest_t **);
77 	void		(*cupsFreeDests)(int, cups_dest_t *);
78 	ipp_t		*(*cupsDoFileRequest)(http_t *, ipp_t *,
79 	    const char *, const char *);
80 	ipp_t		*(*ippNew)();
81 	void		(*ippDelete)();
82 	char		*(*ippErrorString)();
83 	ipp_attribute_t	*(*ippAddString)();
84 	void		(*httpClose)(http_t *);
85 	http_t		*(*httpConnect)(const char *, int);
86 } smb_cups_ops_t;
87 
88 static uint32_t smbd_cups_jobnum = 1;
89 static smb_cups_ops_t smb_cups;
90 static mutex_t smbd_cups_mutex;
91 
92 static void *smbd_spool_monitor(void *);
93 static smb_cups_ops_t *smbd_cups_ops(void);
94 static void smbd_print_share_comment(smb_share_t *, cups_dest_t *);
95 static void *smbd_share_printers(void *);
96 static void smbd_spool_copyfile(smb_inaddr_t *, char *, char *, char *);
97 
98 extern smbd_t smbd;
99 
100 /*
101  * Start the spool thread.
102  * Returns 0 on success, an error number if thread creation fails.
103  */
104 void
105 smbd_spool_start(void)
106 {
107 	pthread_attr_t	attr;
108 	int		rc;
109 
110 	if (!smb_config_getbool(SMB_CI_PRINT_ENABLE))
111 		return;
112 
113 	(void) pthread_attr_init(&attr);
114 	(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
115 	rc = pthread_create(&smbd.s_spool_tid, &attr, smbd_spool_monitor, NULL);
116 	(void) pthread_attr_destroy(&attr);
117 
118 	if (rc != 0)
119 		syslog(LOG_NOTICE,
120 		    "failed to start print monitor: %s", strerror(errno));
121 }
122 
123 /*
124  * A single pthread_kill should be sufficient but we include
125  * a couple of retries to avoid implementation idiosyncrasies
126  * around signal delivery.
127  */
128 void
129 smbd_spool_stop(void)
130 {
131 	int	i;
132 
133 	if (pthread_self() == smbd.s_spool_tid)
134 		return;
135 
136 	for (i = 0; i < 3 && smbd.s_spool_tid != 0; ++i) {
137 		if (pthread_kill(smbd.s_spool_tid, SIGTERM) == ESRCH)
138 			break;
139 
140 		(void) sleep(1);
141 	}
142 }
143 
144 /*
145  * This thread blocks waiting for close print file in the kernel.
146  * It then uses the data returned from the ioctl to copy the spool file
147  * into the cups spooler.
148  *
149  * This mechanism is really only used by Windows Vista and Windows 7.
150  * Other versions of Windows create a zero size file, which is removed
151  * by smbd_spool_copyfile.
152  */
153 /*ARGSUSED*/
154 static void *
155 smbd_spool_monitor(void *arg)
156 {
157 	uint32_t	spool_num;
158 	char		username[MAXNAMELEN];
159 	char		path[MAXPATHLEN];
160 	smb_inaddr_t	ipaddr;
161 	int		error_retry_cnt = 5;
162 
163 	smbd_online_wait("smbd_spool_monitor");
164 
165 	spoolss_register_copyfile(smbd_spool_copyfile);
166 
167 	while (!smbd.s_shutting_down && (error_retry_cnt > 0)) {
168 		errno = 0;
169 
170 		if (smb_kmod_get_spool_doc(&spool_num, username,
171 		    path, &ipaddr) == 0) {
172 			smbd_spool_copyfile(&ipaddr,
173 			    username, path, SMBD_CUPS_DOCNAME);
174 			error_retry_cnt = 5;
175 		} else {
176 			if (errno == ECANCELED)
177 				break;
178 			if ((errno != EINTR) && (errno != EAGAIN))
179 				error_retry_cnt--;
180 			(void) sleep(SMB_SPOOL_WAIT);
181 		}
182 	}
183 
184 	spoolss_register_copyfile(NULL);
185 	smbd.s_spool_tid = 0;
186 	return (NULL);
187 }
188 
189 /*
190  * All versions of windows use this function to spool files to a printer
191  * via the cups interface
192  */
193 static void
194 smbd_spool_copyfile(smb_inaddr_t *ipaddr, char *username, char *path,
195     char *doc_name)
196 {
197 	smb_cups_ops_t	*cups;
198 	http_t		*http = NULL;		/* HTTP connection to server */
199 	ipp_t		*request = NULL;	/* IPP Request */
200 	ipp_t		*response = NULL;	/* IPP Response */
201 	cups_lang_t	*language = NULL;	/* Default language */
202 	char		uri[HTTP_MAX_URI];	/* printer-uri attribute */
203 	char		new_jobname[SMBD_PJOBLEN];
204 	smbd_printjob_t	pjob;
205 	char		clientname[INET6_ADDRSTRLEN];
206 	struct stat	sbuf;
207 	int		rc = 1;
208 
209 	if (stat(path, &sbuf)) {
210 		syslog(LOG_INFO, "smbd_spool_copyfile: %s: %s",
211 		    path, strerror(errno));
212 		return;
213 	}
214 
215 	/*
216 	 * Remove zero size files and return; these were inadvertantly
217 	 * created by XP or 2000.
218 	 */
219 	if (sbuf.st_size == 0) {
220 		if (remove(path) != 0)
221 			syslog(LOG_INFO,
222 			    "smbd_spool_copyfile: cannot remove %s: %s",
223 			    path, strerror(errno));
224 		return;
225 	}
226 
227 	if ((cups = smbd_cups_ops()) == NULL)
228 		return;
229 
230 	if ((http = cups->httpConnect("localhost", 631)) == NULL) {
231 		syslog(LOG_INFO,
232 		    "smbd_spool_copyfile: cupsd not running");
233 		return;
234 	}
235 
236 	if ((request = cups->ippNew()) == NULL) {
237 		syslog(LOG_INFO,
238 		    "smbd_spool_copyfile: ipp not running");
239 		return;
240 	}
241 
242 	request->request.op.operation_id = IPP_PRINT_JOB;
243 	request->request.op.request_id = 1;
244 	language = cups->cupsLangDefault();
245 
246 	cups->ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_CHARSET,
247 	    "attributes-charset", NULL, cups->cupsLangEncoding(language));
248 
249 	cups->ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_LANGUAGE,
250 	    "attributes-natural-language", NULL, language->language);
251 
252 	(void) snprintf(uri, sizeof (uri), "ipp://localhost/printers/%s",
253 	    SMBD_PRINTER);
254 	pjob.pj_pid = pthread_self();
255 	pjob.pj_sysjob = 10;
256 	(void) strlcpy(pjob.pj_filename, path, SMBD_PJOBLEN);
257 	pjob.pj_start_time = time(NULL);
258 	pjob.pj_status = 2;
259 	pjob.pj_size = sbuf.st_blocks * 512;
260 	pjob.pj_page_count = 1;
261 	pjob.pj_isspooled = B_TRUE;
262 	pjob.pj_jobnum = smbd_cups_jobnum;
263 
264 	(void) strlcpy(pjob.pj_jobname, doc_name, SMBD_PJOBLEN);
265 	(void) strlcpy(pjob.pj_username, username, SMBD_PJOBLEN);
266 	(void) strlcpy(pjob.pj_queuename, SMBD_CUPS_SPOOL_DIR, SMBD_PJOBLEN);
267 
268 	cups->ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI,
269 	    "printer-uri", NULL, uri);
270 
271 	cups->ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
272 	    "requesting-user-name", NULL, pjob.pj_username);
273 
274 	if (smb_inet_ntop(ipaddr, clientname,
275 	    SMB_IPSTRLEN(ipaddr->a_family)) == NULL) {
276 		syslog(LOG_INFO,
277 		    "smbd_spool_copyfile: %s: unknown client", clientname);
278 		goto out;
279 	}
280 
281 	cups->ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
282 	    "job-originating-host-name", NULL, clientname);
283 
284 	(void) snprintf(new_jobname, SMBD_PJOBLEN, "%s%d",
285 	    SMBD_FN_PREFIX, pjob.pj_jobnum);
286 	cups->ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_NAME,
287 	    "job-name", NULL, new_jobname);
288 
289 	(void) snprintf(uri, sizeof (uri) - 1, "/printers/%s", SMBD_PRINTER);
290 
291 	response = cups->cupsDoFileRequest(http, request, uri,
292 	    pjob.pj_filename);
293 	if (response != NULL) {
294 		if (response->request.status.status_code >= IPP_OK_CONFLICT) {
295 			syslog(LOG_ERR,
296 			    "smbd_spool_copyfile: printer %s: %s",
297 			    SMBD_PRINTER,
298 			    cups->ippErrorString(cups->cupsLastError()));
299 		} else {
300 			atomic_inc_32(&smbd_cups_jobnum);
301 			rc = 0;
302 		}
303 	} else {
304 		syslog(LOG_ERR,
305 		    "smbd_spool_copyfile: unable to print to %s",
306 		    cups->ippErrorString(cups->cupsLastError()));
307 	}
308 
309 	if (rc == 0)
310 		(void) unlink(pjob.pj_filename);
311 
312 out:
313 	if (response)
314 		cups->ippDelete(response);
315 
316 	if (language)
317 		cups->cupsLangFree(language);
318 
319 	if (http)
320 		cups->httpClose(http);
321 }
322 
323 int
324 smbd_cups_init(void)
325 {
326 	(void) mutex_lock(&smbd_cups_mutex);
327 
328 	if (smb_cups.cups_hdl != NULL) {
329 		(void) mutex_unlock(&smbd_cups_mutex);
330 		return (0);
331 	}
332 
333 	if ((smb_cups.cups_hdl = dlopen("libcups.so.2", RTLD_NOW)) == NULL) {
334 		(void) mutex_unlock(&smbd_cups_mutex);
335 		syslog(LOG_DEBUG,
336 		    "smbd_cups_init: cannot open libcups");
337 		return (ENOENT);
338 	}
339 
340 	smb_cups.cupsLangDefault =
341 	    (cups_lang_t *(*)())dlsym(smb_cups.cups_hdl, "cupsLangDefault");
342 	smb_cups.cupsLangEncoding = (const char *(*)(cups_lang_t *))
343 	    dlsym(smb_cups.cups_hdl, "cupsLangEncoding");
344 	smb_cups.cupsDoFileRequest =
345 	    (ipp_t *(*)(http_t *, ipp_t *, const char *, const char *))
346 	    dlsym(smb_cups.cups_hdl, "cupsDoFileRequest");
347 	smb_cups.cupsLastError = (ipp_status_t (*)())
348 	    dlsym(smb_cups.cups_hdl, "cupsLastError");
349 	smb_cups.cupsLangFree = (void (*)(cups_lang_t *))
350 	    dlsym(smb_cups.cups_hdl, "cupsLangFree");
351 	smb_cups.cupsGetDests = (int (*)(cups_dest_t **))
352 	    dlsym(smb_cups.cups_hdl, "cupsGetDests");
353 	smb_cups.cupsFreeDests = (void (*)(int, cups_dest_t *))
354 	    dlsym(smb_cups.cups_hdl, "cupsFreeDests");
355 
356 	smb_cups.httpClose = (void (*)(http_t *))
357 	    dlsym(smb_cups.cups_hdl, "httpClose");
358 	smb_cups.httpConnect = (http_t *(*)(const char *, int))
359 	    dlsym(smb_cups.cups_hdl, "httpConnect");
360 
361 	smb_cups.ippNew = (ipp_t *(*)())dlsym(smb_cups.cups_hdl, "ippNew");
362 	smb_cups.ippDelete = (void (*)())dlsym(smb_cups.cups_hdl, "ippDelete");
363 	smb_cups.ippErrorString = (char *(*)())
364 	    dlsym(smb_cups.cups_hdl, "ippErrorString");
365 	smb_cups.ippAddString = (ipp_attribute_t *(*)())
366 	    dlsym(smb_cups.cups_hdl, "ippAddString");
367 
368 	if (smb_cups.cupsLangDefault == NULL ||
369 	    smb_cups.cupsLangEncoding == NULL ||
370 	    smb_cups.cupsDoFileRequest == NULL ||
371 	    smb_cups.cupsLastError == NULL ||
372 	    smb_cups.cupsLangFree == NULL ||
373 	    smb_cups.cupsGetDests == NULL ||
374 	    smb_cups.cupsFreeDests == NULL ||
375 	    smb_cups.ippNew == NULL ||
376 	    smb_cups.httpClose == NULL ||
377 	    smb_cups.httpConnect == NULL ||
378 	    smb_cups.ippDelete == NULL ||
379 	    smb_cups.ippErrorString == NULL ||
380 	    smb_cups.ippAddString == NULL) {
381 		(void) dlclose(smb_cups.cups_hdl);
382 		smb_cups.cups_hdl = NULL;
383 		(void) mutex_unlock(&smbd_cups_mutex);
384 		syslog(LOG_DEBUG,
385 		    "smbd_cups_init: cannot load libcups");
386 		return (ENOENT);
387 	}
388 
389 	(void) mutex_unlock(&smbd_cups_mutex);
390 	return (0);
391 }
392 
393 void
394 smbd_cups_fini(void)
395 {
396 	(void) mutex_lock(&smbd_cups_mutex);
397 
398 	if (smb_cups.cups_hdl != NULL) {
399 		(void) dlclose(smb_cups.cups_hdl);
400 		smb_cups.cups_hdl = NULL;
401 	}
402 
403 	(void) mutex_unlock(&smbd_cups_mutex);
404 }
405 
406 static smb_cups_ops_t *
407 smbd_cups_ops(void)
408 {
409 	if (smb_cups.cups_hdl == NULL)
410 		return (NULL);
411 
412 	return (&smb_cups);
413 }
414 
415 void
416 smbd_load_printers(void)
417 {
418 	pthread_t	tid;
419 	pthread_attr_t	attr;
420 	int		rc;
421 
422 	if (!smb_config_getbool(SMB_CI_PRINT_ENABLE))
423 		return;
424 
425 	(void) pthread_attr_init(&attr);
426 	(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
427 	rc = pthread_create(&tid, &attr, smbd_share_printers, NULL);
428 	(void) pthread_attr_destroy(&attr);
429 
430 	if (rc != 0)
431 		syslog(LOG_NOTICE,
432 		    "unable to load printer shares: %s", strerror(errno));
433 }
434 
435 /*
436  * All print shares use the path from print$.
437  */
438 static void *
439 smbd_share_printers(void *arg __unused)
440 {
441 	cups_dest_t	*dests;
442 	cups_dest_t	*dest;
443 	smb_cups_ops_t	*cups;
444 	smb_share_t	si;
445 	uint32_t	nerr;
446 	int		num_dests;
447 	int		i;
448 
449 	if (!smb_config_getbool(SMB_CI_PRINT_ENABLE))
450 		return (NULL);
451 
452 	if ((cups = smbd_cups_ops()) == NULL)
453 		return (NULL);
454 
455 	if (smb_shr_get(SMB_SHARE_PRINT, &si) != NERR_Success) {
456 		syslog(LOG_DEBUG,
457 		    "smbd_share_printers unable to load %s", SMB_SHARE_PRINT);
458 		return (NULL);
459 	}
460 
461 	num_dests = cups->cupsGetDests(&dests);
462 
463 	for (i = num_dests, dest = dests; i > 0; i--, dest++) {
464 		if (dest->instance != NULL)
465 			continue;
466 
467 		(void) strlcpy(si.shr_name, dest->name, MAXPATHLEN);
468 		smbd_print_share_comment(&si, dest);
469 		si.shr_type = STYPE_PRINTQ;
470 
471 		nerr = smb_shr_add(&si);
472 		if (nerr == NERR_Success || nerr == NERR_DuplicateShare)
473 			syslog(LOG_DEBUG,
474 			    "shared printer: %s", si.shr_name);
475 		else
476 			syslog(LOG_DEBUG,
477 			    "smbd_share_printers: unable to add share %s: %u",
478 			    si.shr_name, nerr);
479 	}
480 
481 	cups->cupsFreeDests(num_dests, dests);
482 	return (NULL);
483 }
484 
485 static void
486 smbd_print_share_comment(smb_share_t *si, cups_dest_t *dest)
487 {
488 	cups_option_t	*options;
489 	char		*comment;
490 	char		*name;
491 	char		*value;
492 	int		i;
493 
494 	comment = "Print Share";
495 
496 	if ((options = dest->options) == NULL) {
497 		(void) strlcpy(si->shr_cmnt, comment, SMB_SHARE_CMNT_MAX);
498 		return;
499 	}
500 
501 	for (i = 0; i < dest->num_options; ++i) {
502 		name = options[i].name;
503 		value = options[i].value;
504 
505 		if (name == NULL || value == NULL ||
506 		    *name == '\0' || *value == '\0')
507 			continue;
508 
509 		if (strcasecmp(name, "printer-info") == 0) {
510 			comment = value;
511 			break;
512 		}
513 	}
514 
515 	(void) strlcpy(si->shr_cmnt, comment, SMB_SHARE_CMNT_MAX);
516 }
517 
518 #else	/* HAVE_CUPS */
519 
520 /*
521  * If not HAVE_CUPS, just provide a few "stubs".
522  */
523 
524 int
525 smbd_cups_init(void)
526 {
527 	return (ENOENT);
528 }
529 
530 void
531 smbd_cups_fini(void)
532 {
533 }
534 
535 void
536 smbd_load_printers(void)
537 {
538 }
539 
540 void
541 smbd_spool_init(void)
542 {
543 }
544 
545 void
546 smbd_spool_fini(void)
547 {
548 }
549 
550 void
551 smbd_spool_start(void)
552 {
553 }
554 
555 void
556 smbd_spool_stop(void)
557 {
558 }
559 
560 #endif	/* HAVE_CUPS */
561