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/*
Unix SMB/CIFS implementation.
NBT netbios routines and daemon - version 2
Copyright (C) Andrew Tridgell 1994-1998
Copyright (C) Luke Kenneth Casson Leighton 1994-1998
Copyright (C) Jeremy Allison 1994-1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "nmbd/nmbd.h"
/****************************************************************************
Deal with a response packet when releasing one of our names.
****************************************************************************/
static void release_name_response(struct subnet_record *subrec,
struct response_record *rrec, struct packet_struct *p)
{
/*
* If we are releasing broadcast, then getting a response is an
* error. If we are releasing unicast, then we expect to get a response.
*/
struct nmb_packet *nmb = &p->packet.nmb;
bool bcast = nmb->header.nm_flags.bcast;
bool success = True;
struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
struct nmb_name *answer_name = &nmb->answers->rr_name;
struct in_addr released_ip;
/* Sanity check. Ensure that the answer name in the incoming packet is the
same as the requested name in the outgoing packet. */
if (!nmb_name_equal(question_name, answer_name)) {
DEBUG(0,("release_name_response: Answer name %s differs from question name %s.\n",
nmb_namestr(answer_name), nmb_namestr(question_name)));
return;
}
if (bcast) {
/* Someone sent a response to a bcast release? ignore it. */
return;
}
/* Unicast - check to see if the response allows us to release the name. */
if (nmb->header.rcode != 0) {
/* Error code - we were told not to release the name ! What now ! */
success = False;
DEBUG(0,("release_name_response: WINS server at IP %s rejected our \
name release of name %s with error code %d.\n",
inet_ntoa(p->ip),
nmb_namestr(answer_name), nmb->header.rcode));
} else if (nmb->header.opcode == NMB_WACK_OPCODE) {
/* WINS server is telling us to wait. Pretend we didn't get
the response but don't send out any more release requests. */
DEBUG(5,("release_name_response: WACK from WINS server %s in releasing \
name %s on subnet %s.\n",
inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->subnet_name));
rrec->repeat_count = 0;
/* How long we should wait for. */
rrec->repeat_time = p->timestamp + nmb->answers->ttl;
rrec->num_msgs--;
return;
}
DEBUG(5,("release_name_response: %s in releasing name %s on subnet %s.\n",
success ? "success" : "failure", nmb_namestr(answer_name), subrec->subnet_name));
if (success) {
putip((char*)&released_ip ,&nmb->answers->rdata[2]);
if(rrec->success_fn)
(*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, released_ip);
standard_success_release( subrec, rrec->userdata, answer_name, released_ip);
} else {
/* We have no standard_fail_release - maybe we should add one ? */
if (rrec->fail_fn) {
(*(release_name_fail_function)rrec->fail_fn)(subrec, rrec, answer_name);
}
}
remove_response_record(subrec, rrec);
}
/****************************************************************************
Deal with a timeout when releasing one of our names.
****************************************************************************/
static void release_name_timeout_response(struct subnet_record *subrec,
struct response_record *rrec)
{
/* a release is *always* considered to be successful when it
times out. This doesn't cause problems as if a WINS server
doesn't respond and someone else wants the name then the
normal WACK/name query from the WINS server will cope */
struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
bool bcast = sent_nmb->header.nm_flags.bcast;
struct nmb_name *question_name = &sent_nmb->question.question_name;
struct in_addr released_ip;
/* Get the ip address we were trying to release. */
putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]);
if (!bcast) {
/* mark the WINS server temporarily dead */
wins_srv_died(rrec->packet->ip, released_ip);
}
DEBUG(5,("release_name_timeout_response: success in releasing name %s on subnet %s.\n",
nmb_namestr(question_name), subrec->subnet_name));
if (rrec->success_fn) {
(*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip);
}
standard_success_release( subrec, rrec->userdata, question_name, released_ip);
remove_response_record(subrec, rrec);
}
/*
when releasing a name with WINS we need to send the release to each of
the WINS groups
*/
static void wins_release_name(struct name_record *namerec,
release_name_success_function success_fn,
release_name_fail_function fail_fn,
struct userdata_struct *userdata)
{
int t, i;
char **wins_tags;
/* get the list of wins tags - we try to release for each of them */
wins_tags = wins_srv_tags();
for (t=0;wins_tags && wins_tags[t]; t++) {
for (i = 0; i < namerec->data.num_ips; i++) {
struct in_addr wins_ip = wins_srv_ip_tag(wins_tags[t], namerec->data.ip[i]);
bool last_one = ((i==namerec->data.num_ips - 1) && !wins_tags[t+1]);
if (queue_release_name(unicast_subnet,
release_name_response,
release_name_timeout_response,
last_one?success_fn : NULL,
last_one? fail_fn : NULL,
last_one? userdata : NULL,
&namerec->name,
namerec->data.nb_flags,
namerec->data.ip[i],
wins_ip) == NULL) {
DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
}
}
}
wins_srv_tags_free(wins_tags);
}
/****************************************************************************
Try and release one of our names.
****************************************************************************/
void release_name(struct subnet_record *subrec, struct name_record *namerec,
release_name_success_function success_fn,
release_name_fail_function fail_fn,
struct userdata_struct *userdata)
{
int i;
/* Ensure it's a SELF name, and in the ACTIVE state. */
if ((namerec->data.source != SELF_NAME) || !NAME_IS_ACTIVE(namerec)) {
DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n",
nmb_namestr(&namerec->name), subrec->subnet_name, namerec->data.source));
return;
}
/* Set the name into the deregistering state. */
namerec->data.nb_flags |= NB_DEREG;
/* wins releases are a bit different */
if (subrec == unicast_subnet) {
wins_release_name(namerec, success_fn, fail_fn, userdata);
return;
}
/*
* Go through and release the name for all known ip addresses.
* Only call the success/fail function on the last one (it should
* only be done once).
*/
for (i = 0; i < namerec->data.num_ips; i++) {
if (queue_release_name(subrec,
release_name_response,
release_name_timeout_response,
(i == (namerec->data.num_ips - 1)) ? success_fn : NULL,
(i == (namerec->data.num_ips - 1)) ? fail_fn : NULL,
(i == (namerec->data.num_ips - 1)) ? userdata : NULL,
&namerec->name,
namerec->data.nb_flags,
namerec->data.ip[i],
subrec->bcast_ip) == NULL) {
DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
}
}
}
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