2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
5 Copyright (C) Andrew Tridgell 1994-1998
6 Copyright (C) Luke Kenneth Casson Leighton 1994-1998
7 Copyright (C) Jeremy Allison 1994-1998
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 2 of the License, or
12 (at your option) any later version.
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.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 extern int DEBUGLEVEL;
30 extern fstring global_myworkgroup;
32 /****************************************************************************
33 Deal with a response packet when registering one of our names.
34 ****************************************************************************/
36 static void register_name_response(struct subnet_record *subrec,
37 struct response_record *rrec, struct packet_struct *p)
40 * If we are registering broadcast, then getting a response is an
41 * error - we do not have the name. If we are registering unicast,
42 * then we expect to get a response.
45 struct nmb_packet *nmb = &p->packet.nmb;
46 BOOL bcast = nmb->header.nm_flags.bcast;
48 struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
49 struct nmb_name *answer_name = &nmb->answers->rr_name;
52 struct in_addr registered_ip;
54 /* Sanity check. Ensure that the answer name in the incoming packet is the
55 same as the requested name in the outgoing packet. */
57 if(!question_name || !answer_name)
59 DEBUG(0,("register_name_response: malformed response (%s is NULL).\n",
60 question_name ? "question_name" : "answer_name" ));
64 if(!nmb_name_equal(question_name, answer_name))
66 DEBUG(0,("register_name_response: Answer name %s differs from question \
67 name %s.\n", nmb_namestr(answer_name), nmb_namestr(question_name)));
74 * Special hack to cope with old Samba nmbd's.
75 * Earlier versions of Samba (up to 1.9.16p11) respond
76 * to a broadcast name registration of WORKGROUP<1b> when
77 * they should not. Hence, until these versions are gone,
78 * we should treat such errors as success for this particular
79 * case only. jallison@whistle.com.
82 #if 1 /* OLD_SAMBA_SERVER_HACK */
83 if((nmb->header.rcode == ACT_ERR) && strequal(global_myworkgroup, answer_name->name) &&
84 (answer_name->name_type == 0x1b))
86 /* Pretend we did not get this. */
89 DEBUG(5,("register_name_response: Ignoring broadcast response to \
90 registration of name %s due to old Samba server bug.\n", nmb_namestr(answer_name)));
93 #endif /* OLD_SAMBA_SERVER_HACK */
95 /* Someone else has the name. Log the problem. */
96 DEBUG(1,("register_name_response: Failed to register \
97 name %s on subnet %s via broadcast. Error code was %d. Reject came from IP %s\n",
98 nmb_namestr(answer_name),
99 subrec->subnet_name, nmb->header.rcode, inet_ntoa(p->ip)));
104 /* Unicast - check to see if the response allows us to have the name. */
105 if(nmb->header.rcode != 0)
107 /* Error code - we didn't get the name. */
110 DEBUG(0,("register_name_response: server at IP %s rejected our \
111 name registration of %s with error code %d.\n", inet_ntoa(p->ip),
112 nmb_namestr(answer_name), nmb->header.rcode));
115 else if(nmb->header.opcode == NMB_WACK_OPCODE)
117 /* WINS server is telling us to wait. Pretend we didn't get
118 the response but don't send out any more register requests. */
120 DEBUG(5,("register_name_response: WACK from WINS server %s in registering \
121 name %s on subnet %s.\n", inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->subnet_name));
123 rrec->repeat_count = 0;
124 /* How long we should wait for. */
125 rrec->repeat_time = p->timestamp + nmb->answers->ttl;
132 /* Get the data we need to pass to the success function. */
133 nb_flags = get_nb_flags(nmb->answers->rdata);
134 putip((char*)®istered_ip,&nmb->answers->rdata[2]);
135 ttl = nmb->answers->ttl;
139 DEBUG(5,("register_name_response: %s in registering name %s on subnet %s.\n",
140 success ? "success" : "failure", nmb_namestr(answer_name), subrec->subnet_name));
144 /* Enter the registered name into the subnet name database before calling
145 the success function. */
146 standard_success_register(subrec, rrec->userdata, answer_name, nb_flags, ttl, registered_ip);
147 if( rrec->success_fn)
148 (*rrec->success_fn)(subrec, rrec->userdata, answer_name, nb_flags, ttl, registered_ip);
153 (*rrec->fail_fn)(subrec, rrec, question_name);
154 /* Remove the name. */
155 standard_fail_register( subrec, rrec, question_name);
158 /* Ensure we don't retry. */
159 remove_response_record(subrec, rrec);
162 /****************************************************************************
163 Deal with a timeout when registering one of our names.
164 ****************************************************************************/
166 static void register_name_timeout_response(struct subnet_record *subrec,
167 struct response_record *rrec)
170 * If we are registering unicast, then NOT getting a response is an
171 * error - we do not have the name. If we are registering broadcast,
172 * then we don't expect to get a response.
175 struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
176 BOOL bcast = sent_nmb->header.nm_flags.bcast;
177 BOOL success = False;
178 struct nmb_name *question_name = &sent_nmb->question.question_name;
181 struct in_addr registered_ip;
185 if(rrec->num_msgs == 0)
187 /* Not receiving a message is success for broadcast registration. */
190 /* Pull the success values from the original request packet. */
191 nb_flags = get_nb_flags(sent_nmb->additional->rdata);
192 ttl = sent_nmb->additional->ttl;
193 putip(®istered_ip,&sent_nmb->additional->rdata[2]);
198 /* Unicast - if no responses then it's an error. */
199 if(rrec->num_msgs == 0)
201 DEBUG(2,("register_name_timeout_response: WINS server at address %s is not \
202 responding.\n", inet_ntoa(rrec->packet->ip)));
204 /* Keep trying to contact the WINS server periodically. This allows
205 us to work correctly if the WINS server is down temporarily when
208 /* Reset the number of attempts to zero and double the interval between
209 retries. Max out at 5 minutes. */
210 rrec->repeat_count = 3;
211 rrec->repeat_interval *= 2;
212 if(rrec->repeat_interval > (5 * 60))
213 rrec->repeat_interval = (5 * 60);
214 rrec->repeat_time = time(NULL) + rrec->repeat_interval;
216 DEBUG(5,("register_name_timeout_response: increasing WINS timeout to %d seconds.\n",
217 (int)rrec->repeat_interval));
218 return; /* Don't remove the response record. */
222 DEBUG(5,("register_name_timeout_response: %s in registering name %s on subnet %s.\n",
223 success ? "success" : "failure", nmb_namestr(question_name), subrec->subnet_name));
226 /* Enter the registered name into the subnet name database before calling
227 the success function. */
228 standard_success_register(subrec, rrec->userdata, question_name, nb_flags, ttl, registered_ip);
229 if( rrec->success_fn)
230 (*rrec->success_fn)(subrec, rrec->userdata, question_name, nb_flags, ttl, registered_ip);
235 (*rrec->fail_fn)(subrec, rrec, question_name);
236 /* Remove the name. */
237 standard_fail_register( subrec, rrec, question_name);
240 /* Ensure we don't retry. */
241 remove_response_record(subrec, rrec);
244 /****************************************************************************
245 Try and register one of our names on the unicast subnet - multihomed.
246 ****************************************************************************/
248 static BOOL multihomed_register_name( struct nmb_name *nmbname, uint16 nb_flags,
249 register_name_success_function success_fn,
250 register_name_fail_function fail_fn,
251 struct userdata_struct *userdata)
254 If we are adding a group name, we just send multiple
255 register name packets to the WINS server (this is an
258 If we are adding a unique name, We need first to add
259 our names to the unicast subnet namelist. This is
260 because when a WINS server receives a multihomed
261 registration request, the first thing it does is to
262 send a name query to the registering machine, to see
263 if it has put the name in it's local namelist.
264 We need the name there so the query response code in
265 nmbd_incomingrequests.c will find it.
267 We are adding this name prematurely (we don't really
268 have it yet), but as this is on the unicast subnet
269 only we will get away with this (only the WINS server
270 will ever query names from us on this subnet).
275 struct in_addr *ip_list = NULL;
276 struct subnet_record *subrec;
278 for(subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec) )
281 if((ip_list = (struct in_addr *)malloc(num_ips * sizeof(struct in_addr)))==NULL)
283 DEBUG(0,("multihomed_register_name: malloc fail !\n"));
287 for( subrec = FIRST_SUBNET, i = 0;
289 subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec), i++ )
290 ip_list[i] = subrec->myip;
292 (void)add_name_to_subnet( unicast_subnet, nmbname->name, nmbname->name_type,
293 nb_flags, lp_max_ttl(), SELF_NAME,
296 /* Now try and register the name, num_ips times. On the last time use
297 the given success and fail functions. */
299 for( i = 0; i < num_ips; i++)
301 if(queue_register_multihomed_name( unicast_subnet,
302 register_name_response,
303 register_name_timeout_response,
304 (i == num_ips - 1) ? success_fn : NULL,
305 (i == num_ips - 1) ? fail_fn : NULL,
306 (i == num_ips - 1) ? userdata : NULL,
311 DEBUG(0,("multihomed_register_name: Failed to send packet trying to \
312 register name %s IP %s\n", nmb_namestr(nmbname), inet_ntoa(ip_list[i]) ));
314 free((char *)ip_list);
319 free((char *)ip_list);
324 /****************************************************************************
325 Try and register one of our names.
326 ****************************************************************************/
328 BOOL register_name(struct subnet_record *subrec,
329 char *name, int type, uint16 nb_flags,
330 register_name_success_function success_fn,
331 register_name_fail_function fail_fn,
332 struct userdata_struct *userdata)
334 struct nmb_name nmbname;
336 make_nmb_name(&nmbname, name, type, scope);
338 /* Always set the NB_ACTIVE flag on the name we are
339 registering. Doesn't make sense without it.
342 nb_flags |= NB_ACTIVE;
344 /* If this is the unicast subnet, and we are a multi-homed
345 host, then register a multi-homed name. */
347 if( (subrec == unicast_subnet) && we_are_multihomed())
348 return multihomed_register_name(&nmbname, nb_flags,
352 if(queue_register_name( subrec,
353 register_name_response,
354 register_name_timeout_response,
361 DEBUG(0,("register_name: Failed to send packet trying to register name %s\n",
362 nmb_namestr(&nmbname)));
368 /****************************************************************************
369 Try and refresh one of our names.
370 ****************************************************************************/
372 BOOL refresh_name(struct subnet_record *subrec, struct name_record *namerec,
373 refresh_name_success_function success_fn,
374 refresh_name_fail_function fail_fn,
375 struct userdata_struct *userdata)
380 * Go through and refresh the name for all known ip addresses.
381 * Only call the success/fail function on the last one (it should
382 * only be done once).
385 for( i = 0; i < namerec->data.num_ips; i++)
387 if(queue_refresh_name( subrec,
388 register_name_response,
389 register_name_timeout_response,
390 (i == (namerec->data.num_ips - 1)) ? success_fn : NULL,
391 (i == (namerec->data.num_ips - 1)) ? fail_fn : NULL,
392 (i == (namerec->data.num_ips - 1)) ? userdata : NULL,
394 namerec->data.ip[i]) == NULL)
396 DEBUG(0,("refresh_name: Failed to send packet trying to refresh name %s\n",
397 nmb_namestr(&namerec->name)));