Line data Source code
1 : /*
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
7 :
8 : This program is free software; you can redistribute it and/or modify
9 : it under the terms of the GNU General Public License as published by
10 : the Free Software Foundation; either version 3 of the License, or
11 : (at your option) any later version.
12 :
13 : This program is distributed in the hope that it will be useful,
14 : but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 : GNU General Public License for more details.
17 :
18 : You should have received a copy of the GNU General Public License
19 : along with this program. If not, see <http://www.gnu.org/licenses/>.
20 :
21 : */
22 :
23 : #include "includes.h"
24 : #include "../librpc/gen_ndr/svcctl.h"
25 : #include "nmbd/nmbd.h"
26 : #include "lib/util/string_wrappers.h"
27 :
28 : extern bool found_lm_clients;
29 :
30 : #if 0
31 :
32 : /* XXXX note: This function is currently unsuitable for use, as it
33 : does not properly check that a server is in a fit state to become
34 : a backup browser before asking it to be one.
35 : The code is left here to be worked on at a later date.
36 : */
37 :
38 : /****************************************************************************
39 : Tell a server to become a backup browser
40 : **************************************************************************/
41 :
42 : void tell_become_backup(void)
43 : {
44 : struct subnet_record *subrec;
45 : for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec))
46 : {
47 : struct work_record *work;
48 : for (work = subrec->workgrouplist; work; work = work->next)
49 : {
50 : struct server_record *servrec;
51 : int num_servers = 0;
52 : int num_backups = 0;
53 :
54 : for (servrec = work->serverlist; servrec; servrec = servrec->next)
55 : {
56 : num_servers++;
57 :
58 : if (is_myname(servrec->serv.name))
59 : continue;
60 :
61 : if (servrec->serv.type & SV_TYPE_BACKUP_BROWSER)
62 : {
63 : num_backups++;
64 : continue;
65 : }
66 :
67 : if (servrec->serv.type & SV_TYPE_MASTER_BROWSER)
68 : continue;
69 :
70 : if (!(servrec->serv.type & SV_TYPE_POTENTIAL_BROWSER))
71 : continue;
72 :
73 : DEBUG(3,("num servers: %d num backups: %d\n",
74 : num_servers, num_backups));
75 :
76 : /* make first server a backup server. thereafter make every
77 : tenth server a backup server */
78 : if (num_backups != 0 && (num_servers+9) / num_backups > 10)
79 : continue;
80 :
81 : DEBUG(2,("sending become backup to %s %s for %s\n",
82 : servrec->serv.name, inet_ntoa(subrec->bcast_ip),
83 : work->work_group));
84 :
85 : /* type 11 request from MYNAME(20) to WG(1e) for SERVER */
86 : do_announce_request(servrec->serv.name, work->work_group,
87 : ANN_BecomeBackup, 0x20, 0x1e, subrec->bcast_ip);
88 : }
89 : }
90 : }
91 : }
92 : #endif
93 :
94 : /*******************************************************************
95 : Process an incoming host announcement packet.
96 : *******************************************************************/
97 :
98 83 : void process_host_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf)
99 : {
100 83 : struct dgram_packet *dgram = &p->packet.dgram;
101 83 : int ttl = IVAL(buf,1)/1000;
102 : unstring announce_name;
103 83 : uint32_t servertype = IVAL(buf,23);
104 : fstring comment;
105 : struct work_record *work;
106 : struct server_record *servrec;
107 : unstring work_name;
108 : unstring source_name;
109 83 : ZERO_STRUCT(source_name);
110 83 : ZERO_STRUCT(announce_name);
111 :
112 83 : pull_ascii_fstring(comment, buf+31);
113 :
114 83 : pull_ascii_nstring(announce_name, sizeof(announce_name), buf+5);
115 83 : pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
116 :
117 83 : DEBUG(3,("process_host_announce: from %s<%02x> IP %s to \
118 : %s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
119 : nmb_namestr(&dgram->dest_name),announce_name));
120 :
121 83 : DEBUG(5,("process_host_announce: ttl=%d server type=%08x comment=%s\n",
122 : ttl, servertype,comment));
123 :
124 : /* Filter servertype to remove impossible bits. */
125 83 : servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
126 :
127 : /* A host announcement must be sent to the name WORKGROUP<1d>. */
128 83 : if(dgram->dest_name.name_type != 0x1d) {
129 0 : DEBUG(2,("process_host_announce: incorrect name type for destination from IP %s \
130 : (was %02x) should be 0x1d. Allowing packet anyway.\n",
131 : inet_ntoa(p->ip), dgram->dest_name.name_type));
132 : /* Change it so it was. */
133 0 : dgram->dest_name.name_type = 0x1d;
134 : }
135 :
136 : /* For a host announce the workgroup name is the destination name. */
137 83 : pull_ascii_nstring(work_name, sizeof(work_name), dgram->dest_name.name);
138 :
139 : /*
140 : * Syntax servers version 5.1 send HostAnnounce packets to
141 : * *THE WRONG NAME*. They send to LOCAL_MASTER_BROWSER_NAME<00>
142 : * instead of WORKGROUP<1d> name. So to fix this we check if
143 : * the workgroup name is our own name, and if so change it
144 : * to be our primary workgroup name.
145 : */
146 :
147 83 : if(strequal(work_name, lp_netbios_name()))
148 0 : unstrcpy(work_name,lp_workgroup());
149 :
150 : /*
151 : * We are being very agressive here in adding a workgroup
152 : * name on the basis of a host announcing itself as being
153 : * in that workgroup. Maybe we should wait for the workgroup
154 : * announce instead ? JRA.
155 : */
156 :
157 83 : work = find_workgroup_on_subnet(subrec, work_name);
158 :
159 83 : if(servertype != 0) {
160 75 : if (work ==NULL ) {
161 : /* We have no record of this workgroup. Add it. */
162 0 : if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
163 0 : goto done;
164 : }
165 :
166 75 : if((servrec = find_server_in_workgroup( work, announce_name))==NULL) {
167 : /* If this server is not already in the workgroup, add it. */
168 11 : create_server_on_workgroup(work, announce_name,
169 11 : servertype|SV_TYPE_LOCAL_LIST_ONLY,
170 : ttl, comment);
171 : } else {
172 : /* Update the record. */
173 64 : servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
174 64 : update_server_ttl( servrec, ttl);
175 64 : strlcpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment));
176 : }
177 : } else {
178 : /*
179 : * This server is announcing it is going down. Remove it from the
180 : * workgroup.
181 : */
182 8 : if(!is_myname(announce_name) && (work != NULL) &&
183 0 : ((servrec = find_server_in_workgroup( work, announce_name))!=NULL)) {
184 8 : remove_server_from_workgroup( work, servrec);
185 : }
186 : }
187 :
188 83 : subrec->work_changed = True;
189 83 : done:
190 83 : return;
191 : }
192 :
193 : /*******************************************************************
194 : Process an incoming WORKGROUP announcement packet.
195 : *******************************************************************/
196 :
197 132 : void process_workgroup_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf)
198 : {
199 132 : struct dgram_packet *dgram = &p->packet.dgram;
200 132 : int ttl = IVAL(buf,1)/1000;
201 : unstring workgroup_announce_name;
202 : unstring master_name;
203 132 : uint32_t servertype = IVAL(buf,23);
204 : struct work_record *work;
205 : unstring source_name;
206 : unstring dest_name;
207 :
208 132 : pull_ascii_nstring(workgroup_announce_name,sizeof(workgroup_announce_name),buf+5);
209 132 : pull_ascii_nstring(master_name,sizeof(master_name),buf+31);
210 132 : pull_ascii_nstring(source_name,sizeof(source_name),dgram->source_name.name);
211 132 : pull_ascii_nstring(dest_name,sizeof(dest_name),dgram->dest_name.name);
212 :
213 132 : DEBUG(3,("process_workgroup_announce: from %s<%02x> IP %s to \
214 : %s for workgroup %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
215 : nmb_namestr(&dgram->dest_name),workgroup_announce_name));
216 :
217 132 : DEBUG(5,("process_workgroup_announce: ttl=%d server type=%08x master browser=%s\n",
218 : ttl, servertype, master_name));
219 :
220 : /* Workgroup announcements must only go to the MSBROWSE name. */
221 132 : if (!strequal(dest_name, MSBROWSE) || (dgram->dest_name.name_type != 0x1)) {
222 0 : DEBUG(0,("process_workgroup_announce: from IP %s should be to __MSBROWSE__<0x01> not %s\n",
223 : inet_ntoa(p->ip), nmb_namestr(&dgram->dest_name)));
224 0 : goto done;
225 : }
226 :
227 132 : if ((work = find_workgroup_on_subnet(subrec, workgroup_announce_name))==NULL) {
228 : /* We have no record of this workgroup. Add it. */
229 26 : if((work = create_workgroup_on_subnet(subrec, workgroup_announce_name, ttl))==NULL)
230 0 : goto done;
231 : } else {
232 : /* Update the workgroup death_time. */
233 106 : update_workgroup_ttl(work, ttl);
234 : }
235 :
236 132 : if(*work->local_master_browser_name == '\0') {
237 : /* Set the master browser name. */
238 26 : set_workgroup_local_master_browser_name( work, master_name );
239 : }
240 :
241 132 : subrec->work_changed = True;
242 :
243 132 : done:
244 132 : return;
245 : }
246 :
247 : /*******************************************************************
248 : Process an incoming local master browser announcement packet.
249 : *******************************************************************/
250 :
251 62 : void process_local_master_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf)
252 : {
253 62 : struct dgram_packet *dgram = &p->packet.dgram;
254 62 : int ttl = IVAL(buf,1)/1000;
255 : unstring server_name;
256 62 : uint32_t servertype = IVAL(buf,23);
257 : fstring comment;
258 : unstring work_name;
259 62 : struct work_record *work = NULL;
260 : struct server_record *servrec;
261 : unstring source_name;
262 :
263 62 : pull_ascii_nstring(server_name,sizeof(server_name),buf+5);
264 62 : pull_ascii_fstring(comment, buf+31);
265 62 : pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
266 62 : pull_ascii_nstring(work_name, sizeof(work_name), dgram->dest_name.name);
267 :
268 62 : DEBUG(3,("process_local_master_announce: from %s<%02x> IP %s to \
269 : %s for server %s.\n", source_name, source_name[15], inet_ntoa(p->ip),
270 : nmb_namestr(&dgram->dest_name),server_name));
271 :
272 62 : DEBUG(5,("process_local_master_announce: ttl=%d server type=%08x comment=%s\n",
273 : ttl, servertype, comment));
274 :
275 : /* A local master announcement must be sent to the name WORKGROUP<1e>. */
276 62 : if(dgram->dest_name.name_type != 0x1e) {
277 0 : DEBUG(0,("process_local_master_announce: incorrect name type for destination from IP %s \
278 : (was %02x) should be 0x1e. Ignoring packet.\n",
279 : inet_ntoa(p->ip), dgram->dest_name.name_type));
280 0 : goto done;
281 : }
282 :
283 : /* Filter servertype to remove impossible bits. */
284 62 : servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
285 :
286 : /* For a local master announce the workgroup name is the destination name. */
287 :
288 62 : if ((work = find_workgroup_on_subnet(subrec, work_name))==NULL) {
289 : /* Don't bother adding if it's a local master release announce. */
290 0 : if(servertype == 0)
291 0 : goto done;
292 :
293 : /* We have no record of this workgroup. Add it. */
294 0 : if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
295 0 : goto done;
296 : }
297 :
298 : /* If we think we're the local master browser for this workgroup,
299 : we should never have got this packet. We don't see our own
300 : packets.
301 : */
302 62 : if(AM_LOCAL_MASTER_BROWSER(work)) {
303 0 : DEBUG(0,("process_local_master_announce: Server %s at IP %s is announcing itself as \
304 : a local master browser for workgroup %s and we think we are master. Forcing election.\n",
305 : server_name, inet_ntoa(p->ip), work_name));
306 :
307 : /* Samba nmbd versions 1.9.17 to 1.9.17p4 have a bug in that when
308 : they have become a local master browser once, they will never
309 : stop sending local master announcements. To fix this we send
310 : them a reset browser packet, with level 0x2 on the __SAMBA__
311 : name that only they should be listening to. */
312 :
313 0 : send_browser_reset( 0x2, "__SAMBA__" , 0x20, p->ip);
314 :
315 : /* We should demote ourself and force an election. */
316 :
317 0 : unbecome_local_master_browser( subrec, work, True);
318 :
319 : /* The actual election requests are handled in nmbd_election.c */
320 0 : goto done;
321 : }
322 :
323 : /* Find the server record on this workgroup. If it doesn't exist, add it. */
324 :
325 62 : if(servertype != 0) {
326 61 : if((servrec = find_server_in_workgroup( work, server_name))==NULL) {
327 : /* If this server is not already in the workgroup, add it. */
328 10 : create_server_on_workgroup(work, server_name,
329 10 : servertype|SV_TYPE_LOCAL_LIST_ONLY,
330 : ttl, comment);
331 : } else {
332 : /* Update the record. */
333 101 : if (servrec->serv.type !=
334 51 : (servertype|SV_TYPE_LOCAL_LIST_ONLY)) {
335 0 : servrec->serv.type =
336 0 : servertype|SV_TYPE_LOCAL_LIST_ONLY;
337 0 : subrec->work_changed = true;
338 : }
339 51 : if (!strequal(servrec->serv.comment,comment)) {
340 0 : strlcpy(servrec->serv.comment,
341 : comment,
342 : sizeof(servrec->serv.comment));
343 0 : subrec->work_changed = true;
344 : }
345 51 : update_server_ttl(servrec, ttl);
346 : }
347 :
348 61 : if (!strequal(work->local_master_browser_name, server_name)) {
349 10 : set_workgroup_local_master_browser_name( work, server_name );
350 10 : subrec->work_changed = true;
351 : }
352 : } else {
353 : /*
354 : * This server is announcing it is going down. Remove it from the
355 : * workgroup.
356 : */
357 2 : if(!is_myname(server_name) &&
358 0 : ((servrec = find_server_in_workgroup( work, server_name))!=NULL)) {
359 1 : remove_server_from_workgroup( work, servrec);
360 : }
361 : }
362 :
363 60 : done:
364 62 : return;
365 : }
366 :
367 : /*******************************************************************
368 : Process a domain master announcement frame.
369 : Domain master browsers receive these from local masters. The Domain
370 : master should then issue a sync with the local master, asking for
371 : that machines local server list.
372 : ******************************************************************/
373 :
374 0 : void process_master_browser_announce(struct subnet_record *subrec,
375 : struct packet_struct *p,const char *buf)
376 : {
377 : unstring local_master_name;
378 : struct work_record *work;
379 : struct browse_cache_record *browrec;
380 :
381 0 : pull_ascii_nstring(local_master_name,sizeof(local_master_name),buf);
382 :
383 0 : DEBUG(3,("process_master_browser_announce: Local master announce from %s IP %s.\n",
384 : local_master_name, inet_ntoa(p->ip)));
385 :
386 0 : if (!lp_domain_master()) {
387 0 : DEBUG(0,("process_master_browser_announce: Not configured as domain \
388 : master - ignoring master announce.\n"));
389 0 : goto done;
390 : }
391 :
392 0 : if((work = find_workgroup_on_subnet(subrec, lp_workgroup())) == NULL) {
393 0 : DEBUG(0,("process_master_browser_announce: Cannot find workgroup %s on subnet %s\n",
394 : lp_workgroup(), subrec->subnet_name));
395 0 : goto done;
396 : }
397 :
398 0 : if(!AM_DOMAIN_MASTER_BROWSER(work)) {
399 0 : DEBUG(0,("process_master_browser_announce: Local master announce made to us from \
400 : %s IP %s and we are not a domain master browser.\n", local_master_name, inet_ntoa(p->ip)));
401 0 : goto done;
402 : }
403 :
404 : /* Add this host as a local master browser entry on the browse lists.
405 : This causes a sync request to be made to it at a later date.
406 : */
407 :
408 0 : if((browrec = find_browser_in_lmb_cache( local_master_name )) == NULL) {
409 : /* Add it. */
410 0 : create_browser_in_lmb_cache( work->work_group, local_master_name, p->ip);
411 : } else {
412 0 : update_browser_death_time(browrec);
413 : }
414 :
415 0 : done:
416 0 : return;
417 : }
418 :
419 : /*******************************************************************
420 : Process an incoming LanMan host announcement packet.
421 : *******************************************************************/
422 :
423 0 : void process_lm_host_announce(struct subnet_record *subrec, struct packet_struct *p, const char *buf, int len)
424 : {
425 0 : struct dgram_packet *dgram = &p->packet.dgram;
426 0 : uint32_t servertype = IVAL(buf,1);
427 0 : int osmajor=CVAL(buf,5); /* major version of node software */
428 0 : int osminor=CVAL(buf,6); /* minor version of node software */
429 0 : int ttl = SVAL(buf,7);
430 : unstring announce_name;
431 : struct work_record *work;
432 : struct server_record *servrec;
433 : unstring work_name;
434 : unstring source_name;
435 : fstring comment;
436 0 : char *s = get_safe_str_ptr(buf,len,discard_const_p(char, buf),9);
437 :
438 0 : if (!s) {
439 0 : goto done;
440 : }
441 0 : s = skip_string(buf,len,s);
442 0 : if (!s) {
443 0 : goto done;
444 : }
445 0 : pull_ascii(comment, s, sizeof(fstring), 43, STR_TERMINATE);
446 :
447 0 : pull_ascii_nstring(announce_name,sizeof(announce_name),buf+9);
448 0 : pull_ascii_nstring(source_name,sizeof(source_name),dgram->source_name.name);
449 : /* For a LanMan host announce the workgroup name is the destination name. */
450 0 : pull_ascii_nstring(work_name,sizeof(work_name),dgram->dest_name.name);
451 :
452 0 : DEBUG(3,("process_lm_host_announce: LM Announcement from %s IP %s to \
453 : %s for server %s.\n", nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
454 : nmb_namestr(&dgram->dest_name),announce_name));
455 :
456 0 : DEBUG(5,("process_lm_host_announce: os=(%d,%d) ttl=%d server type=%08x comment=%s\n",
457 : osmajor, osminor, ttl, servertype,comment));
458 :
459 0 : if ((osmajor < 36) || (osmajor > 38) || (osminor !=0)) {
460 0 : DEBUG(5,("process_lm_host_announce: LM Announcement packet does not \
461 : originate from OS/2 Warp client. Ignoring packet.\n"));
462 : /* Could have been from a Windows machine (with its LM Announce enabled),
463 : or a Samba server. Then don't disrupt the current browse list. */
464 0 : goto done;
465 : }
466 :
467 : /* Filter servertype to remove impossible bits. */
468 0 : servertype &= ~(SV_TYPE_LOCAL_LIST_ONLY|SV_TYPE_DOMAIN_ENUM);
469 :
470 : /* A LanMan host announcement must be sent to the name WORKGROUP<00>. */
471 0 : if(dgram->dest_name.name_type != 0x00) {
472 0 : DEBUG(2,("process_lm_host_announce: incorrect name type for destination from IP %s \
473 : (was %02x) should be 0x00. Allowing packet anyway.\n",
474 : inet_ntoa(p->ip), dgram->dest_name.name_type));
475 : /* Change it so it was. */
476 0 : dgram->dest_name.name_type = 0x00;
477 : }
478 :
479 : /*
480 : * Syntax servers version 5.1 send HostAnnounce packets to
481 : * *THE WRONG NAME*. They send to LOCAL_MASTER_BROWSER_NAME<00>
482 : * instead of WORKGROUP<1d> name. So to fix this we check if
483 : * the workgroup name is our own name, and if so change it
484 : * to be our primary workgroup name. This code is probably
485 : * not needed in the LanMan announce code, but it won't hurt.
486 : */
487 :
488 0 : if(strequal(work_name, lp_netbios_name()))
489 0 : unstrcpy(work_name,lp_workgroup());
490 :
491 : /*
492 : * We are being very agressive here in adding a workgroup
493 : * name on the basis of a host announcing itself as being
494 : * in that workgroup. Maybe we should wait for the workgroup
495 : * announce instead ? JRA.
496 : */
497 :
498 0 : work = find_workgroup_on_subnet(subrec, work_name);
499 :
500 0 : if(servertype != 0) {
501 0 : if (work == NULL) {
502 : /* We have no record of this workgroup. Add it. */
503 0 : if((work = create_workgroup_on_subnet(subrec, work_name, ttl))==NULL)
504 0 : goto done;
505 : }
506 :
507 0 : if((servrec = find_server_in_workgroup( work, announce_name))==NULL) {
508 : /* If this server is not already in the workgroup, add it. */
509 0 : create_server_on_workgroup(work, announce_name,
510 0 : servertype|SV_TYPE_LOCAL_LIST_ONLY,
511 : ttl, comment);
512 : } else {
513 : /* Update the record. */
514 0 : servrec->serv.type = servertype|SV_TYPE_LOCAL_LIST_ONLY;
515 0 : update_server_ttl( servrec, ttl);
516 0 : strlcpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment));
517 : }
518 : } else {
519 : /*
520 : * This server is announcing it is going down. Remove it from the
521 : * workgroup.
522 : */
523 0 : if(!is_myname(announce_name) && (work != NULL) &&
524 0 : ((servrec = find_server_in_workgroup( work, announce_name))!=NULL)) {
525 0 : remove_server_from_workgroup( work, servrec);
526 : }
527 : }
528 :
529 0 : subrec->work_changed = True;
530 0 : found_lm_clients = True;
531 :
532 0 : done:
533 0 : return;
534 : }
535 :
536 : /****************************************************************************
537 : Send a backup list response.
538 : *****************************************************************************/
539 :
540 0 : static void send_backup_list_response(struct subnet_record *subrec,
541 : struct work_record *work,
542 : struct nmb_name *send_to_name,
543 : unsigned char max_number_requested,
544 : uint32_t token, struct in_addr sendto_ip,
545 : int port)
546 : {
547 : char outbuf[1024];
548 : char *p, *countptr;
549 0 : unsigned int count = 0;
550 : unstring send_to_namestr;
551 : #if 0
552 : struct server_record *servrec;
553 : #endif
554 : unstring myname;
555 :
556 0 : memset(outbuf,'\0',sizeof(outbuf));
557 :
558 0 : DEBUG(3,("send_backup_list_response: sending backup list for workgroup %s to %s IP %s\n",
559 : work->work_group, nmb_namestr(send_to_name), inet_ntoa(sendto_ip)));
560 :
561 0 : p = outbuf;
562 :
563 0 : SCVAL(p,0,ANN_GetBackupListResp); /* Backup list response opcode. */
564 0 : p++;
565 :
566 0 : countptr = p;
567 0 : p++;
568 :
569 0 : SIVAL(p,0,token); /* The sender's unique info. */
570 0 : p += 4;
571 :
572 : /* We always return at least one name - our own. */
573 0 : count = 1;
574 0 : unstrcpy(myname, lp_netbios_name());
575 0 : if (!strupper_m(myname)) {
576 0 : DEBUG(4,("strupper_m %s failed\n", myname));
577 0 : return;
578 : }
579 0 : myname[15]='\0';
580 0 : push_ascii(p, myname, sizeof(outbuf)-PTR_DIFF(p,outbuf)-1, STR_TERMINATE);
581 :
582 0 : p = skip_string(outbuf,sizeof(outbuf),p);
583 :
584 : /* Look for backup browsers in this workgroup. */
585 :
586 : #if 0
587 : /* we don't currently send become_backup requests so we should never
588 : send any other servers names out as backups for our
589 : workgroup. That's why this is commented out (tridge) */
590 :
591 : /*
592 : * NB. Note that the struct work_record here is not neccessarily
593 : * attached to the subnet *subrec.
594 : */
595 :
596 : for (servrec = work->serverlist; servrec; servrec = servrec->next)
597 : {
598 : int len = PTR_DIFF(p, outbuf);
599 : if((sizeof(outbuf) - len) < 16)
600 : break;
601 :
602 : if(count >= (unsigned int)max_number_requested)
603 : break;
604 :
605 : if(strnequal(servrec->serv.name, lp_netbios_name(),15))
606 : continue;
607 :
608 : if(!(servrec->serv.type & SV_TYPE_BACKUP_BROWSER))
609 : continue;
610 :
611 : strlcpy(p, servrec->serv.name, 16);
612 : strupper_m(p);
613 : count++;
614 :
615 : DEBUG(5,("send_backup_list_response: Adding server %s number %d\n",
616 : p, count));
617 :
618 : p = skip_string(outbuf,sizeof(outbuf),p);
619 : }
620 : #endif
621 :
622 0 : SCVAL(countptr, 0, count);
623 :
624 0 : pull_ascii_nstring(send_to_namestr, sizeof(send_to_namestr), send_to_name->name);
625 :
626 0 : DEBUG(4,("send_backup_list_response: sending response to %s<00> IP %s with %d servers.\n",
627 : send_to_namestr, inet_ntoa(sendto_ip), count));
628 :
629 0 : send_mailslot(True, BROWSE_MAILSLOT,
630 0 : outbuf,PTR_DIFF(p,outbuf),
631 : lp_netbios_name(), 0,
632 : send_to_namestr,0,
633 : sendto_ip, subrec->myip, port);
634 : }
635 :
636 : /*******************************************************************
637 : Process a send backup list request packet.
638 :
639 : A client sends a backup list request to ask for a list of servers on
640 : the net that maintain server lists for a domain. A server is then
641 : chosen from this list to send NetServerEnum commands to to list
642 : available servers.
643 :
644 : ********************************************************************/
645 :
646 0 : void process_get_backup_list_request(struct subnet_record *subrec,
647 : struct packet_struct *p,const char *buf)
648 : {
649 0 : struct dgram_packet *dgram = &p->packet.dgram;
650 : struct work_record *work;
651 0 : unsigned char max_number_requested = CVAL(buf,0);
652 0 : uint32_t token = IVAL(buf,1); /* Sender's key index for the workgroup. */
653 0 : int name_type = dgram->dest_name.name_type;
654 : unstring workgroup_name;
655 0 : struct subnet_record *search_subrec = subrec;
656 :
657 0 : pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
658 :
659 0 : DEBUG(3,("process_get_backup_list_request: request from %s IP %s to %s.\n",
660 : nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
661 : nmb_namestr(&dgram->dest_name)));
662 :
663 : /* We have to be a master browser, or a domain master browser
664 : for the requested workgroup. That means it must be our
665 : workgroup. */
666 :
667 0 : if(strequal(workgroup_name, lp_workgroup()) == False) {
668 0 : DEBUG(7,("process_get_backup_list_request: Ignoring announce request for workgroup %s.\n",
669 : workgroup_name));
670 0 : goto done;
671 : }
672 :
673 0 : if((work = find_workgroup_on_subnet(search_subrec, workgroup_name)) == NULL) {
674 0 : DEBUG(0,("process_get_backup_list_request: Cannot find workgroup %s on \
675 : subnet %s.\n", workgroup_name, search_subrec->subnet_name));
676 0 : goto done;
677 : }
678 :
679 : /*
680 : * If the packet was sent to WORKGROUP<1b> instead
681 : * of WORKGROUP<1d> then it was unicast to us a domain master
682 : * browser. Change search subrec to unicast.
683 : */
684 :
685 0 : if(name_type == 0x1b) {
686 : /* We must be a domain master browser in order to
687 : process this packet. */
688 :
689 0 : if(!AM_DOMAIN_MASTER_BROWSER(work)) {
690 0 : DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
691 : and I am not a domain master browser.\n", workgroup_name));
692 0 : goto done;
693 : }
694 :
695 0 : search_subrec = unicast_subnet;
696 0 : } else if (name_type == 0x1d) {
697 : /* We must be a local master browser in order to process this packet. */
698 :
699 0 : if(!AM_LOCAL_MASTER_BROWSER(work)) {
700 0 : DEBUG(0,("process_get_backup_list_request: domain list requested for workgroup %s \
701 : and I am not a local master browser.\n", workgroup_name));
702 0 : goto done;
703 : }
704 : } else {
705 0 : DEBUG(0,("process_get_backup_list_request: Invalid name type %x - should be 0x1b or 0x1d.\n",
706 : name_type));
707 0 : goto done;
708 : }
709 :
710 0 : send_backup_list_response(subrec, work, &dgram->source_name,
711 : max_number_requested, token, p->ip, p->port);
712 :
713 0 : done:
714 0 : return;
715 : }
716 :
717 : /*******************************************************************
718 : Process a reset browser state packet.
719 :
720 : Diagnostic packet:
721 : 0x1 - Stop being a master browser and become a backup browser.
722 : 0x2 - Discard browse lists, stop being a master browser, try again.
723 : 0x4 - Stop being a master browser forever.
724 :
725 : ******************************************************************/
726 :
727 0 : void process_reset_browser(struct subnet_record *subrec,
728 : struct packet_struct *p,const char *buf)
729 : {
730 0 : struct dgram_packet *dgram = &p->packet.dgram;
731 0 : int state = CVAL(buf,0);
732 : struct subnet_record *sr;
733 :
734 0 : DEBUG(1,("process_reset_browser: received diagnostic browser reset \
735 : request from %s IP %s state=0x%X\n",
736 : nmb_namestr(&dgram->source_name), inet_ntoa(p->ip), state));
737 :
738 : /* Stop being a local master browser on all our broadcast subnets. */
739 0 : if (state & 0x1) {
740 0 : for (sr = FIRST_SUBNET; sr; sr = NEXT_SUBNET_EXCLUDING_UNICAST(sr)) {
741 : struct work_record *work;
742 0 : for (work = sr->workgrouplist; work; work = work->next) {
743 0 : if (AM_LOCAL_MASTER_BROWSER(work))
744 0 : unbecome_local_master_browser(sr, work, True);
745 : }
746 : }
747 : }
748 :
749 : /* Discard our browse lists. */
750 0 : if (state & 0x2) {
751 : /*
752 : * Calling expire_workgroups_and_servers with a -1
753 : * time causes all servers not marked with a PERMANENT_TTL
754 : * on the workgroup lists to be discarded, and all
755 : * workgroups with empty server lists to be discarded.
756 : * This means we keep our own server names and workgroup
757 : * as these have a PERMANENT_TTL.
758 : */
759 :
760 0 : expire_workgroups_and_servers(-1);
761 : }
762 :
763 : /* Request to stop browsing altogether. */
764 0 : if (state & 0x4)
765 0 : DEBUG(1,("process_reset_browser: ignoring request to stop being a browser.\n"));
766 0 : }
767 :
768 : /*******************************************************************
769 : Process an announcement request packet.
770 : We don't respond immediately, we just check it's a request for
771 : our workgroup and then set the flag telling the announce code
772 : in nmbd_sendannounce.c:announce_my_server_names that an
773 : announcement is needed soon.
774 : ******************************************************************/
775 :
776 5 : void process_announce_request(struct subnet_record *subrec, struct packet_struct *p, const char *buf)
777 : {
778 5 : struct dgram_packet *dgram = &p->packet.dgram;
779 : struct work_record *work;
780 : unstring workgroup_name;
781 :
782 5 : pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
783 5 : DEBUG(3,("process_announce_request: Announce request from %s IP %s to %s.\n",
784 : nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
785 : nmb_namestr(&dgram->dest_name)));
786 :
787 : /* We only send announcement requests on our workgroup. */
788 5 : if(strequal(workgroup_name, lp_workgroup()) == False) {
789 0 : DEBUG(7,("process_announce_request: Ignoring announce request for workgroup %s.\n",
790 : workgroup_name));
791 0 : goto done;
792 : }
793 :
794 5 : if((work = find_workgroup_on_subnet(subrec, workgroup_name)) == NULL) {
795 0 : DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n",
796 : workgroup_name));
797 0 : goto done;
798 : }
799 :
800 5 : work->needannounce = True;
801 5 : done:
802 5 : return;
803 : }
804 :
805 : /*******************************************************************
806 : Process a LanMan announcement request packet.
807 : We don't respond immediately, we just check it's a request for
808 : our workgroup and then set the flag telling that we have found
809 : a LanMan client (DOS or OS/2) and that we will have to start
810 : sending LanMan announcements (unless specifically disabled
811 : through the "lm announce" parameter in smb.conf)
812 : ******************************************************************/
813 :
814 0 : void process_lm_announce_request(struct subnet_record *subrec, struct packet_struct *p, const char *buf, int len)
815 : {
816 0 : struct dgram_packet *dgram = &p->packet.dgram;
817 : unstring workgroup_name;
818 :
819 0 : pull_ascii_nstring(workgroup_name, sizeof(workgroup_name), dgram->dest_name.name);
820 0 : DEBUG(3,("process_lm_announce_request: Announce request from %s IP %s to %s.\n",
821 : nmb_namestr(&dgram->source_name), inet_ntoa(p->ip),
822 : nmb_namestr(&dgram->dest_name)));
823 :
824 : /* We only send announcement requests on our workgroup. */
825 0 : if(strequal(workgroup_name, lp_workgroup()) == False) {
826 0 : DEBUG(7,("process_lm_announce_request: Ignoring announce request for workgroup %s.\n",
827 : workgroup_name));
828 0 : goto done;
829 : }
830 :
831 0 : if(find_workgroup_on_subnet(subrec, workgroup_name) == NULL) {
832 0 : DEBUG(0,("process_announce_request: Unable to find workgroup %s on subnet !\n",
833 : workgroup_name));
834 0 : goto done;
835 : }
836 :
837 0 : found_lm_clients = True;
838 :
839 0 : done:
840 0 : return;
841 : }
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