2 Unix SMB/CIFS implementation.
3 NBT netbios routines and daemon - version 2
4 Copyright (C) Andrew Tridgell 1994-1998
5 Copyright (C) Luke Kenneth Casson Leighton 1994-1998
6 Copyright (C) Jeremy Allison 1994-1998
9 Copyright (C) John H Terpstra 1995-1998
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
27 #include "../librpc/gen_ndr/svcctl.h"
28 #include "nmbd/nmbd.h"
29 #include "lib/util/string_wrappers.h"
31 extern int updatecount
;
32 extern bool found_lm_clients
;
34 /****************************************************************************
35 Send a browser reset packet.
36 **************************************************************************/
38 void send_browser_reset(int reset_type
, const char *to_name
, int to_type
, struct in_addr to_ip
)
43 DBG_NOTICE("send_browser_reset: sending reset request type %d to %s<%02x> IP %s.\n",
44 reset_type
, to_name
, to_type
, inet_ntoa(to_ip
) );
46 memset(outbuf
,'\0',sizeof(outbuf
));
48 SCVAL(p
,0,ANN_ResetBrowserState
);
50 SCVAL(p
,0,reset_type
);
53 send_mailslot(True
, BROWSE_MAILSLOT
, outbuf
,PTR_DIFF(p
,outbuf
),
54 lp_netbios_name(), 0x0, to_name
, to_type
, to_ip
,
55 FIRST_SUBNET
->myip
, DGRAM_PORT
);
58 /****************************************************************************
59 Broadcast a packet to the local net requesting that all servers in this
60 workgroup announce themselves to us.
61 **************************************************************************/
63 void broadcast_announce_request(struct subnet_record
*subrec
, struct work_record
*work
)
68 work
->needannounce
= True
;
70 DBG_NOTICE("broadcast_announce_request: sending announce request for workgroup %s \
71 to subnet %s\n", work
->work_group
, subrec
->subnet_name
);
73 memset(outbuf
,'\0',sizeof(outbuf
));
75 SCVAL(p
,0,ANN_AnnouncementRequest
);
78 SCVAL(p
,0,work
->token
); /* (local) Unique workgroup token id. */
80 p
+= push_string_check(p
+1, lp_netbios_name(), 15, STR_ASCII
|STR_UPPER
|STR_TERMINATE
);
82 send_mailslot(False
, BROWSE_MAILSLOT
, outbuf
,PTR_DIFF(p
,outbuf
),
83 lp_netbios_name(), 0x0, work
->work_group
,0x1e, subrec
->bcast_ip
,
84 subrec
->myip
, DGRAM_PORT
);
87 /****************************************************************************
88 Broadcast an announcement.
89 **************************************************************************/
91 static void send_announcement(struct subnet_record
*subrec
, int announce_type
,
92 const char *from_name
, const char *to_name
, int to_type
, struct in_addr to_ip
,
93 time_t announce_interval
,
94 const char *server_name
, int server_type
, const char *server_comment
)
97 unstring upper_server_name
;
100 memset(outbuf
,'\0',sizeof(outbuf
));
103 SCVAL(outbuf
,0,announce_type
);
105 /* Announcement parameters. */
106 SCVAL(p
,0,updatecount
);
107 SIVAL(p
,1,announce_interval
*1000); /* Milliseconds - despite the spec. */
109 strlcpy(upper_server_name
, server_name
? server_name
: "", sizeof(upper_server_name
));
110 if (!strupper_m(upper_server_name
)) {
111 DBG_WARNING("strupper_m %s failed\n", upper_server_name
);
114 push_string_check(p
+5, upper_server_name
, 16, STR_ASCII
|STR_TERMINATE
);
116 SCVAL(p
,21,SAMBA_MAJOR_NBT_ANNOUNCE_VERSION
); /* Major version. */
117 SCVAL(p
,22,SAMBA_MINOR_NBT_ANNOUNCE_VERSION
); /* Minor version. */
119 SIVAL(p
,23,server_type
& ~SV_TYPE_LOCAL_LIST_ONLY
);
120 /* Browse version: got from NT/AS 4.00 - Value defined in smb.h (JHT). */
121 SSVAL(p
,27,BROWSER_ELECTION_VERSION
);
122 SSVAL(p
,29,BROWSER_CONSTANT
); /* Browse signature. */
124 p
+= 31 + push_string_check(p
+31, server_comment
, sizeof(outbuf
) - (p
+ 31 - outbuf
), STR_ASCII
|STR_TERMINATE
);
126 send_mailslot(False
,BROWSE_MAILSLOT
, outbuf
, PTR_DIFF(p
,outbuf
),
127 from_name
, 0x0, to_name
, to_type
, to_ip
, subrec
->myip
,
131 /****************************************************************************
132 Broadcast a LanMan announcement.
133 **************************************************************************/
135 static void send_lm_announcement(struct subnet_record
*subrec
, int announce_type
,
136 char *from_name
, char *to_name
, int to_type
, struct in_addr to_ip
,
137 time_t announce_interval
,
138 char *server_name
, int server_type
, char *server_comment
)
143 memset(outbuf
,'\0',sizeof(outbuf
));
145 SSVAL(p
,0,announce_type
);
146 SIVAL(p
,2,server_type
& ~SV_TYPE_LOCAL_LIST_ONLY
);
147 SCVAL(p
,6,SAMBA_MAJOR_NBT_ANNOUNCE_VERSION
); /* Major version. */
148 SCVAL(p
,7,SAMBA_MINOR_NBT_ANNOUNCE_VERSION
); /* Minor version. */
149 SSVAL(p
,8,announce_interval
); /* In seconds - according to spec. */
152 p
+= push_string_check(p
, server_name
, 15, STR_ASCII
|STR_UPPER
|STR_TERMINATE
);
153 p
+= push_string_check(p
, server_comment
, sizeof(outbuf
)- (p
- outbuf
), STR_ASCII
|STR_UPPER
|STR_TERMINATE
);
155 send_mailslot(False
,LANMAN_MAILSLOT
, outbuf
, PTR_DIFF(p
,outbuf
),
156 from_name
, 0x0, to_name
, to_type
, to_ip
, subrec
->myip
,
160 /****************************************************************************
161 We are a local master browser. Announce this to WORKGROUP<1e>.
162 ****************************************************************************/
164 static void send_local_master_announcement(struct subnet_record
*subrec
, struct work_record
*work
,
165 struct server_record
*servrec
)
167 /* Ensure we don't have the prohibited bit set. */
168 uint32_t type
= servrec
->serv
.type
& ~SV_TYPE_LOCAL_LIST_ONLY
;
170 DBG_NOTICE("send_local_master_announcement: type %x for name %s on subnet %s for workgroup %s\n",
171 type
, lp_netbios_name(), subrec
->subnet_name
, work
->work_group
);
173 send_announcement(subrec
, ANN_LocalMasterAnnouncement
,
174 lp_netbios_name(), /* From nbt name. */
175 work
->work_group
, 0x1e, /* To nbt name. */
176 subrec
->bcast_ip
, /* To ip. */
177 work
->announce_interval
, /* Time until next announce. */
178 lp_netbios_name(), /* Name to announce. */
179 type
, /* Type field. */
180 servrec
->serv
.comment
);
183 /****************************************************************************
184 Announce the workgroup WORKGROUP to MSBROWSE<01>.
185 ****************************************************************************/
187 static void send_workgroup_announcement(struct subnet_record
*subrec
, struct work_record
*work
)
189 DBG_NOTICE("send_workgroup_announcement: on subnet %s for workgroup %s\n",
190 subrec
->subnet_name
, work
->work_group
);
192 send_announcement(subrec
, ANN_DomainAnnouncement
,
193 lp_netbios_name(), /* From nbt name. */
194 MSBROWSE
, 0x1, /* To nbt name. */
195 subrec
->bcast_ip
, /* To ip. */
196 work
->announce_interval
, /* Time until next announce. */
197 work
->work_group
, /* Name to announce. */
198 SV_TYPE_DOMAIN_ENUM
|SV_TYPE_NT
, /* workgroup announce flags. */
199 lp_netbios_name()); /* From name as comment. */
202 /****************************************************************************
203 Announce the given host to WORKGROUP<1d>.
204 ****************************************************************************/
206 static void send_host_announcement(struct subnet_record
*subrec
, struct work_record
*work
,
207 struct server_record
*servrec
)
209 /* Ensure we don't have the prohibited bits set. */
210 uint32_t type
= servrec
->serv
.type
& ~SV_TYPE_LOCAL_LIST_ONLY
;
212 DBG_NOTICE("send_host_announcement: type %x for host %s on subnet %s for workgroup %s\n",
213 type
, servrec
->serv
.name
, subrec
->subnet_name
, work
->work_group
);
215 send_announcement(subrec
, ANN_HostAnnouncement
,
216 servrec
->serv
.name
, /* From nbt name. */
217 work
->work_group
, 0x1d, /* To nbt name. */
218 subrec
->bcast_ip
, /* To ip. */
219 work
->announce_interval
, /* Time until next announce. */
220 servrec
->serv
.name
, /* Name to announce. */
221 type
, /* Type field. */
222 servrec
->serv
.comment
);
225 /****************************************************************************
226 Announce the given LanMan host
227 ****************************************************************************/
229 static void send_lm_host_announcement(struct subnet_record
*subrec
, struct work_record
*work
,
230 struct server_record
*servrec
, int lm_interval
)
232 /* Ensure we don't have the prohibited bits set. */
233 uint32_t type
= servrec
->serv
.type
& ~SV_TYPE_LOCAL_LIST_ONLY
;
235 DBG_NOTICE("send_lm_host_announcement: type %x for host %s on subnet %s for workgroup %s, ttl: %d\n",
236 type
, servrec
->serv
.name
, subrec
->subnet_name
, work
->work_group
, lm_interval
);
238 send_lm_announcement(subrec
, ANN_HostAnnouncement
,
239 servrec
->serv
.name
, /* From nbt name. */
240 work
->work_group
, 0x00, /* To nbt name. */
241 subrec
->bcast_ip
, /* To ip. */
242 lm_interval
, /* Time until next announce. */
243 servrec
->serv
.name
, /* Name to announce (fstring not netbios name struct). */
244 type
, /* Type field. */
245 servrec
->serv
.comment
);
248 /****************************************************************************
249 Announce a server record.
250 ****************************************************************************/
252 static void announce_server(struct subnet_record
*subrec
, struct work_record
*work
,
253 struct server_record
*servrec
)
255 /* Only do domain announcements if we are a master and it's
256 our primary name we're being asked to announce. */
258 if (AM_LOCAL_MASTER_BROWSER(work
) && strequal(lp_netbios_name(),servrec
->serv
.name
)) {
259 send_local_master_announcement(subrec
, work
, servrec
);
260 send_workgroup_announcement(subrec
, work
);
262 send_host_announcement(subrec
, work
, servrec
);
266 /****************************************************************************
267 Go through all my registered names on all broadcast subnets and announce
268 them if the timeout requires it.
269 **************************************************************************/
271 void announce_my_server_names(time_t t
)
273 struct subnet_record
*subrec
;
275 for (subrec
= FIRST_SUBNET
; subrec
; subrec
= NEXT_SUBNET_EXCLUDING_UNICAST(subrec
)) {
276 struct work_record
*work
= find_workgroup_on_subnet(subrec
, lp_workgroup());
279 struct server_record
*servrec
;
281 if (work
->needannounce
) {
282 /* Drop back to a max 3 minute announce. This is to prevent a
283 single lost packet from breaking things for too long. */
285 work
->announce_interval
= MIN(work
->announce_interval
,
286 CHECK_TIME_MIN_HOST_ANNCE
*60);
287 work
->lastannounce_time
= t
- (work
->announce_interval
+1);
288 work
->needannounce
= False
;
291 /* Announce every minute at first then progress to every 12 mins */
292 if (t
>= work
->lastannounce_time
&&
293 (t
- work
->lastannounce_time
) < work
->announce_interval
) {
297 if (work
->announce_interval
< (CHECK_TIME_MAX_HOST_ANNCE
* 60))
298 work
->announce_interval
+= 60;
300 work
->lastannounce_time
= t
;
302 for (servrec
= work
->serverlist
; servrec
; servrec
= servrec
->next
) {
303 if (is_myname(servrec
->serv
.name
))
304 announce_server(subrec
, work
, servrec
);
310 /****************************************************************************
311 Go through all my registered names on all broadcast subnets and announce
312 them as a LanMan server if the timeout requires it.
313 **************************************************************************/
315 void announce_my_lm_server_names(time_t t
)
317 struct subnet_record
*subrec
;
318 static time_t last_lm_announce_time
=0;
319 int announce_interval
= lp_lm_interval();
320 int lm_announce
= lp_lm_announce();
322 if ((announce_interval
<= 0) || (lm_announce
<= 0)) {
323 /* user absolutely does not want LM announcements to be sent. */
327 if ((lm_announce
>= 2) && (!found_lm_clients
)) {
328 /* has been set to 2 (Auto) but no LM clients detected (yet). */
332 /* Otherwise: must have been set to 1 (Yes), or LM clients *have*
335 for (subrec
= FIRST_SUBNET
; subrec
; subrec
= NEXT_SUBNET_EXCLUDING_UNICAST(subrec
)) {
336 struct work_record
*work
= find_workgroup_on_subnet(subrec
, lp_workgroup());
339 struct server_record
*servrec
;
341 if (last_lm_announce_time
&& ((t
- last_lm_announce_time
) < announce_interval
))
344 last_lm_announce_time
= t
;
346 for (servrec
= work
->serverlist
; servrec
; servrec
= servrec
->next
) {
347 if (is_myname(servrec
->serv
.name
))
348 /* skipping equivalent of announce_server() */
349 send_lm_host_announcement(subrec
, work
, servrec
, announce_interval
);
355 /* Announce timer. Moved into global static so it can be reset
356 when a machine becomes a local master browser. */
357 static time_t announce_timer_last
=0;
359 /****************************************************************************
360 Reset the announce_timer so that a local master browser announce will be done
362 ****************************************************************************/
364 void reset_announce_timer(void)
366 announce_timer_last
= time(NULL
) - (CHECK_TIME_MST_ANNOUNCE
* 60);
369 /****************************************************************************
370 Announce myself as a local master browser to a domain master browser.
371 **************************************************************************/
373 void announce_myself_to_domain_master_browser(time_t t
)
375 struct subnet_record
*subrec
;
376 struct work_record
*work
;
378 if(!we_are_a_wins_client()) {
379 DBG_DEBUG("announce_myself_to_domain_master_browser: no unicast subnet, ignoring.\n");
383 if (!announce_timer_last
)
384 announce_timer_last
= t
;
386 if ((t
-announce_timer_last
) < (CHECK_TIME_MST_ANNOUNCE
* 60)) {
387 DBG_DEBUG("announce_myself_to_domain_master_browser: t (%d) - last(%d) < %d\n",
388 (int)t
, (int)announce_timer_last
,
389 CHECK_TIME_MST_ANNOUNCE
* 60 );
393 announce_timer_last
= t
;
395 /* Look over all our broadcast subnets to see if any of them
396 has the state set as local master browser. */
398 for (subrec
= FIRST_SUBNET
; subrec
; subrec
= NEXT_SUBNET_EXCLUDING_UNICAST(subrec
)) {
399 for (work
= subrec
->workgrouplist
; work
; work
= work
->next
) {
400 if (AM_LOCAL_MASTER_BROWSER(work
)) {
401 DBG_NOTICE( "announce_myself_to_domain_master_browser: I am a local master browser for \
402 workgroup %s on subnet %s\n", work
->work_group
, subrec
->subnet_name
);
404 /* Look in nmbd_browsersync.c for the rest of this code. */
405 announce_and_sync_with_domain_master_browser(subrec
, work
);
411 /****************************************************************************
412 Announce all samba's server entries as 'gone'.
413 This must *only* be called on shutdown.
414 ****************************************************************************/
416 void announce_my_servers_removed(void)
418 int announce_interval
= lp_lm_interval();
419 int lm_announce
= lp_lm_announce();
420 struct subnet_record
*subrec
;
422 for (subrec
= FIRST_SUBNET
; subrec
; subrec
= NEXT_SUBNET_EXCLUDING_UNICAST(subrec
)) {
423 struct work_record
*work
;
424 for (work
= subrec
->workgrouplist
; work
; work
= work
->next
) {
425 struct server_record
*servrec
;
427 work
->announce_interval
= 0;
428 for (servrec
= work
->serverlist
; servrec
; servrec
= servrec
->next
) {
429 if (!is_myname(servrec
->serv
.name
))
431 servrec
->serv
.type
= 0;
432 if(AM_LOCAL_MASTER_BROWSER(work
))
433 send_local_master_announcement(subrec
, work
, servrec
);
434 send_host_announcement(subrec
, work
, servrec
);
436 if ((announce_interval
<= 0) || (lm_announce
<= 0)) {
437 /* user absolutely does not want LM announcements to be sent. */
441 if ((lm_announce
>= 2) && (!found_lm_clients
)) {
442 /* has been set to 2 (Auto) but no LM clients detected (yet). */
447 * lm announce was set or we have seen lm announcements, so do
448 * a lm announcement of host removed.
451 send_lm_host_announcement(subrec
, work
, servrec
, 0);
457 /****************************************************************************
458 Do all the "remote" announcements. These are used to put ourselves
459 on a remote browse list. They are done blind, no checking is done to
460 see if there is actually a local master browser at the other end.
461 **************************************************************************/
463 void announce_remote(time_t t
)
467 static time_t last_time
= 0;
471 int stype
= lp_default_server_announce();
472 TALLOC_CTX
*frame
= NULL
;
473 const struct loadparm_substitution
*lp_sub
=
474 loadparm_s3_global_substitution();
476 if (last_time
&& (t
< (last_time
+ REMOTE_ANNOUNCE_INTERVAL
)))
481 s
= lp_remote_announce(talloc_tos(), lp_sub
);
485 comment
= string_truncate(lp_server_string(talloc_tos(), lp_sub
),
486 MAX_SERVER_STRING_LENGTH
);
488 frame
= talloc_stackframe();
489 for (ptr
=s
; next_token_talloc(frame
,&ptr
,&s2
,NULL
); ) {
490 /* The entries are of the form a.b.c.d/WORKGROUP with
491 WORKGROUP being optional */
496 pwgroup
= strchr_m(s2
,'/');
499 if (!pwgroup
|| !*pwgroup
)
500 wgroup
= lp_workgroup();
504 addr
= interpret_addr2(s2
);
506 /* Announce all our names including aliases */
507 /* Give the ip address as the address of our first
510 for(i
=0; my_netbios_names(i
); i
++) {
511 const char *name
= my_netbios_names(i
);
513 DBG_INFO("announce_remote: Doing remote announce for server %s to IP %s.\n",
514 name
, inet_ntoa(addr
) );
516 send_announcement(FIRST_SUBNET
, ANN_HostAnnouncement
,
517 name
, /* From nbt name. */
518 wgroup
, 0x1d, /* To nbt name. */
520 REMOTE_ANNOUNCE_INTERVAL
, /* Time until next announce. */
521 name
, /* Name to announce. */
522 stype
, /* Type field. */
529 /****************************************************************************
530 Implement the 'remote browse sync' feature Andrew added.
531 These are used to put our browse lists into remote browse lists.
532 **************************************************************************/
534 void browse_sync_remote(time_t t
)
538 static time_t last_time
= 0;
541 struct work_record
*work
;
545 TALLOC_CTX
*frame
= NULL
;
546 const struct loadparm_substitution
*lp_sub
=
547 loadparm_s3_global_substitution();
549 if (last_time
&& (t
< (last_time
+ REMOTE_ANNOUNCE_INTERVAL
)))
554 s
= lp_remote_browse_sync(talloc_tos(), lp_sub
);
559 * We only do this if we are the local master browser
560 * for our workgroup on the firsst subnet.
563 if((work
= find_workgroup_on_subnet(FIRST_SUBNET
, lp_workgroup())) == NULL
) {
564 DBG_WARNING("browse_sync_remote: Cannot find workgroup %s on subnet %s\n",
565 lp_workgroup(), FIRST_SUBNET
->subnet_name
);
569 if(!AM_LOCAL_MASTER_BROWSER(work
)) {
570 DBG_NOTICE("browse_sync_remote: We can only do this if we are a local master browser \
571 for workgroup %s on subnet %s.\n", lp_workgroup(), FIRST_SUBNET
->subnet_name
);
575 memset(outbuf
,'\0',sizeof(outbuf
));
577 SCVAL(p
,0,ANN_MasterAnnouncement
);
580 unstrcpy(myname
, lp_netbios_name());
581 if (!strupper_m(myname
)) {
582 DBG_WARNING("strupper_m %s failed\n", myname
);
586 push_ascii(p
, myname
, sizeof(outbuf
)-PTR_DIFF(p
,outbuf
)-1, STR_TERMINATE
);
588 p
= skip_string(outbuf
,sizeof(outbuf
),p
);
590 frame
= talloc_stackframe();
591 for (ptr
=s
; next_token_talloc(frame
,&ptr
,&s2
,NULL
); ) {
592 /* The entries are of the form a.b.c.d */
593 addr
= interpret_addr2(s2
);
595 DBG_INFO("announce_remote: Doing remote browse sync announce for server %s to IP %s.\n",
596 lp_netbios_name(), inet_ntoa(addr
) );
598 send_mailslot(True
, BROWSE_MAILSLOT
, outbuf
,PTR_DIFF(p
,outbuf
),
599 lp_netbios_name(), 0x0, "*", 0x0, addr
, FIRST_SUBNET
->myip
, DGRAM_PORT
);