text: /* 
     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 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"
  
  /****************************************************************************
   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]) ));
  		}
  	}
  }
  