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/*
Unix SMB/Netbios implementation.
Version 1.9.
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern int DEBUGLEVEL;
extern pstring scope;
/****************************************************************************
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", namestr(answer_name), namestr(question_name)));
return;
}
if(bcast)
{
/* Someone sent a response. This shouldn't happen/ */
DEBUG(1,("release_name_response: A response for releasing name %s was received on a \
broadcast subnet %s. This should not happen !\n", namestr(answer_name), subrec->subnet_name));
return;
}
else
{
/* 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),
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), 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", namestr(answer_name), subrec->subnet_name));
if(success)
{
putip((char*)&released_ip ,&nmb->answers->rdata[2]);
if(rrec->success_fn)
(*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)
(*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)
{
/*
* If we are releasing unicast, then NOT getting a response is an
* error - we could not release the name. If we are releasing broadcast,
* then we don't expect to get a response.
*/
struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
BOOL bcast = sent_nmb->header.nm_flags.bcast;
BOOL success = False;
struct nmb_name *question_name = &sent_nmb->question.question_name;
struct in_addr released_ip;
if(bcast)
{
if(rrec->num_msgs == 0)
{
/* Not receiving a message is success for broadcast release. */
success = True;
/* Get the ip address we were trying to release. */
putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]);
}
}
else
{
/* Unicast - if no responses then it's an error. */
if(rrec->num_msgs == 0)
{
DEBUG(2,("release_name_timeout_response: WINS server at address %s is not \
responding.\n", inet_ntoa(rrec->packet->ip)));
/* Keep trying to contact the WINS server periodically. This allows
us to work correctly if the WINS server is down temporarily when
we want to delete the name. */
/* Reset the number of attempts to zero and double the interval between
retries. Max out at 5 minutes. */
rrec->repeat_count = 3;
rrec->repeat_interval *= 2;
if(rrec->repeat_interval > (5 * 60))
rrec->repeat_interval = (5 * 60);
rrec->repeat_time = time(NULL) + rrec->repeat_interval;
DEBUG(5,("release_name_timeout_response: increasing WINS timeout to %d seconds.\n",
(int)rrec->repeat_interval));
return; /* Don't remove the response record. */
}
}
DEBUG(5,("release_name_timeout_response: %s in releasing name %s on subnet %s.\n",
success ? "success" : "failure", namestr(question_name), subrec->subnet_name));
if(success && rrec->success_fn)
{
if(rrec->success_fn)
(*rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip);
standard_success_release( subrec, rrec->userdata, question_name, released_ip);
}
else
{
/* We have no standard_fail_release - maybe we should add one ? */
if( rrec->fail_fn)
(*rrec->fail_fn)(subrec, rrec, question_name);
}
remove_response_record(subrec, rrec);
}
/****************************************************************************
Try and release one of our names.
****************************************************************************/
BOOL 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",
namestr(&namerec->name), subrec->subnet_name, namerec->data.source));
return True;
}
/* Set the name into the deregistering state. */
namerec->data.nb_flags |= NB_DEREG;
/*
* 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]) == NULL)
{
DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
return True;
}
}
return False;
}
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