first public release of samba4 code

(This used to be commit b0510b5428b3461aeb9bbe3cc95f62fc73e2b97f)

1 files changed, 2032 insertions, 0 deletions

diff --git a/source4/nmbd/nmbd_winsserver.c b/source4/nmbd/nmbd_winsserver.c
new file mode 100644
index 0000000000..4ef476f814
--- /dev/null
+++ b/source4/nmbd/nmbd_winsserver.c
@@ -0,0 +1,2032 @@
+/* 
+   Unix SMB/CIFS implementation.
+   NBT netbios routines and daemon - version 2
+
+   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"
+
+#define WINS_LIST "wins.tdb"
+#define WINS_VERSION 1
+
+/****************************************************************************
+change the wins owner address in the record.
+*****************************************************************************/
+static void update_wins_owner(struct name_record *namerec, struct in_addr wins_ip)
+{
+	if (namerec==NULL)
+		return;
+	namerec->data.wins_ip=wins_ip;
+}
+
+/****************************************************************************
+create the wins flags based on the nb flags and the input value.
+*****************************************************************************/
+static void update_wins_flag(struct name_record *namerec, int flags)
+{
+	if (namerec==NULL)
+		return;
+
+	namerec->data.wins_flags=0x0;
+
+	/* if it's a group, it can be a normal or a special one */
+	if (namerec->data.nb_flags & NB_GROUP) {
+		if (namerec->name.name_type==0x1C)
+			namerec->data.wins_flags|=WINS_SGROUP;
+		else
+			if (namerec->data.num_ips>1)
+				namerec->data.wins_flags|=WINS_SGROUP;
+			else
+				namerec->data.wins_flags|=WINS_NGROUP;
+	} else {
+		/* can be unique or multi-homed */
+		if (namerec->data.num_ips>1)
+			namerec->data.wins_flags|=WINS_MHOMED;
+		else
+			namerec->data.wins_flags|=WINS_UNIQUE;
+	}
+
+	/* the node type are the same bits */
+	namerec->data.wins_flags|=namerec->data.nb_flags&NB_NODETYPEMASK;
+
+	/* the static bit is elsewhere */
+	if (namerec->data.death_time == PERMANENT_TTL)
+		namerec->data.wins_flags|=WINS_STATIC;
+
+	/* and add the given bits */
+	namerec->data.wins_flags|=flags;
+
+	DEBUG(8,("update_wins_flag: nbflags: 0x%x, ttl: 0x%d, flags: 0x%x, winsflags: 0x%x\n", 
+		 namerec->data.nb_flags, (int)namerec->data.death_time, flags, namerec->data.wins_flags));
+
+}
+
+/****************************************************************************
+return the general ID value and increase it if requested
+*****************************************************************************/
+static void get_global_id_and_update(SMB_BIG_UINT *current_id, BOOL update)
+{
+	/*
+	 * it's kept as a static here, to prevent people from messing
+	 * with the value directly
+	 */
+
+	static SMB_BIG_UINT general_id = 1;
+
+	DEBUG(5,("get_global_id_and_update: updating version ID: %d\n", (int)general_id));
+	
+	*current_id = general_id;
+	
+	if (update)
+		general_id++;
+}
+
+/****************************************************************************
+possibly call the WINS hook external program when a WINS change is made
+*****************************************************************************/
+static void wins_hook(const char *operation, struct name_record *namerec, int ttl)
+{
+	pstring command;
+	char *cmd = lp_wins_hook();
+	char *p;
+	int i;
+
+	if (!cmd || !*cmd) return;
+
+	for (p=namerec->name.name; *p; p++) {
+		if (!(isalnum((int)*p) || strchr_m("._-",*p))) {
+			DEBUG(3,("not calling wins hook for invalid name %s\n", nmb_namestr(&namerec->name)));
+			return;
+		}
+	}
+	
+	p = command;
+	p += slprintf(p, sizeof(command)-1, "%s %s %s %02x %d", 
+		      cmd,
+		      operation, 
+		      namerec->name.name,
+		      namerec->name.name_type,
+		      ttl);
+
+	for (i=0;i<namerec->data.num_ips;i++) {
+		p += slprintf(p, sizeof(command) - (p-command) -1, " %s", inet_ntoa(namerec->data.ip[i]));
+	}
+
+	DEBUG(3,("calling wins hook for %s\n", nmb_namestr(&namerec->name)));
+	smbrun(command, NULL);
+}
+
+
+/****************************************************************************
+Determine if this packet should be allocated to the WINS server.
+*****************************************************************************/
+
+BOOL packet_is_for_wins_server(struct packet_struct *packet)
+{
+  struct nmb_packet *nmb = &packet->packet.nmb;
+
+  /* Only unicast packets go to a WINS server. */
+  if((wins_server_subnet == NULL) || (nmb->header.nm_flags.bcast == True))
+  {
+    DEBUG(10, ("packet_is_for_wins_server: failing WINS test #1.\n"));
+    return False;
+  }
+
+  /* Check for node status requests. */
+  if (nmb->question.question_type != QUESTION_TYPE_NB_QUERY)
+    return False;
+
+  switch(nmb->header.opcode)
+  { 
+    /*
+     * A WINS server issues WACKS, not receives them.
+     */
+    case NMB_WACK_OPCODE:
+      DEBUG(10, ("packet_is_for_wins_server: failing WINS test #2 (WACK).\n"));
+      return False;
+    /*
+     * A WINS server only processes registration and
+     * release requests, not responses.
+     */
+    case NMB_NAME_REG_OPCODE:
+    case NMB_NAME_MULTIHOMED_REG_OPCODE:
+    case NMB_NAME_REFRESH_OPCODE_8: /* ambiguity in rfc1002 about which is correct. */
+    case NMB_NAME_REFRESH_OPCODE_9: /* WinNT uses 8 by default. */
+      if(nmb->header.response)
+      {
+        DEBUG(10, ("packet_is_for_wins_server: failing WINS test #3 (response = 1).\n"));
+        return False;
+      }
+      break;
+
+    case NMB_NAME_RELEASE_OPCODE:
+      if(nmb->header.response)
+      {
+        DEBUG(10, ("packet_is_for_wins_server: failing WINS test #4 (response = 1).\n"));
+        return False;
+      }
+      break;
+
+    /*
+     * Only process unicast name queries with rd = 1.
+     */
+    case NMB_NAME_QUERY_OPCODE:
+      if(!nmb->header.response && !nmb->header.nm_flags.recursion_desired)
+      {
+        DEBUG(10, ("packet_is_for_wins_server: failing WINS test #5 (response = 1).\n"));
+        return False;
+      }
+      break;
+  }
+
+  return True;
+}
+
+/****************************************************************************
+Utility function to decide what ttl to give a register/refresh request.
+*****************************************************************************/
+
+static int get_ttl_from_packet(struct nmb_packet *nmb)
+{
+  int ttl = nmb->additional->ttl;
+
+  if(ttl < lp_min_wins_ttl() )
+    ttl = lp_min_wins_ttl();
+
+  if(ttl > lp_max_wins_ttl() )
+    ttl = lp_max_wins_ttl();
+
+  return ttl;
+}
+
+/****************************************************************************
+Load or create the WINS database.
+*****************************************************************************/
+
+BOOL initialise_wins(void)
+{
+	time_t time_now = time(NULL);
+	TDB_CONTEXT *tdb;
+	TDB_DATA kbuf, dbuf, newkey;
+	struct name_record *namerec = NULL;
+	struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
+
+	DEBUG(2,("initialise_wins: started\n"));
+
+	if(!lp_we_are_a_wins_server())
+		return True;
+
+	add_samba_names_to_subnet(wins_server_subnet);
+
+	tdb = tdb_open_log(lock_path(WINS_LIST), 0, TDB_DEFAULT, O_RDONLY, 0600);
+	if (!tdb) {
+		DEBUG(2,("initialise_wins: Can't open wins database file %s. Error was %s\n", WINS_LIST, strerror(errno) ));
+		return True;
+	}
+
+	if (tdb_fetch_int32(tdb, INFO_VERSION) != WINS_VERSION) {
+		DEBUG(0,("Discarding invalid wins.dat file\n"));
+		tdb_close(tdb);
+		return True;
+	}
+
+	for (kbuf = tdb_firstkey(tdb); 
+	     kbuf.dptr; 
+	     newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
+
+		fstring name_type;
+		pstring name, ip_str;
+		char *p;
+		int type = 0;
+		int nb_flags;
+		int ttl;
+		unsigned int num_ips;
+		int high, low;
+		struct in_addr wins_ip;
+		struct in_addr *ip_list;
+		int wins_flags;
+		int len,i;
+
+		if (strncmp(kbuf.dptr, ENTRY_PREFIX, strlen(ENTRY_PREFIX)) != 0)
+			continue;
+				
+		dbuf = tdb_fetch(tdb, kbuf);
+		if (!dbuf.dptr)
+			continue;
+
+		fstrcpy(name_type, kbuf.dptr+strlen(ENTRY_PREFIX));
+
+ 		pstrcpy(name, name_type);
+
+		if((p = strchr(name,'#')) != NULL) {
+			*p = 0;
+			sscanf(p+1,"%x",&type);
+		}
+
+		len = tdb_unpack(dbuf.dptr, dbuf.dsize, "dddfddd",
+				&nb_flags, &high, &low,
+				ip_str, &ttl, &num_ips, &wins_flags);
+
+		wins_ip=*interpret_addr2(ip_str);
+
+		/* Don't reload replica records */
+		if (!ip_equal(wins_ip, our_fake_ip)) {
+			SAFE_FREE(dbuf.dptr);
+			continue;
+		}
+
+		/* Don't reload released or tombstoned records */
+		if ((wins_flags&WINS_STATE_MASK) != WINS_ACTIVE) {
+			SAFE_FREE(dbuf.dptr);
+			continue;
+		}
+
+ 		/* Allocate the space for the ip_list. */
+		if((ip_list = (struct in_addr *)malloc( num_ips * sizeof(struct in_addr))) == NULL) {
+			SAFE_FREE(dbuf.dptr);
+			DEBUG(0,("initialise_wins: Malloc fail !\n"));
+			return False;
+		}
+
+		for (i = 0; i < num_ips; i++) {
+			len += tdb_unpack(dbuf.dptr+len, dbuf.dsize-len, "f", ip_str);
+			ip_list[i] = *interpret_addr2(ip_str);
+		}
+
+		/* add all entries that have 60 seconds or more to live */
+		if ((ttl - 60) > time_now || ttl == PERMANENT_TTL) {
+			if(ttl != PERMANENT_TTL)
+				ttl -= time_now;
+    
+			DEBUG( 4, ("initialise_wins: add name: %s#%02x ttl = %d first IP %s flags = %2x\n",
+			    	   name, type, ttl, inet_ntoa(ip_list[0]), nb_flags));
+
+			namerec=add_name_to_subnet( wins_server_subnet, name, type, nb_flags, 
+					  	ttl, REGISTER_NAME, num_ips, ip_list);
+			if (namerec!=NULL) {
+				update_wins_owner(namerec, wins_ip);
+				update_wins_flag(namerec, wins_flags);
+				/* we don't reload the ID, on startup we restart at 1 */
+				get_global_id_and_update(&namerec->data.id, True);
+			}
+
+		} else {
+			DEBUG(4, ("initialise_wins: not adding name (ttl problem) %s#%02x ttl = %d first IP %s flags = %2x\n",
+				  name, type, ttl, inet_ntoa(ip_list[0]), nb_flags));
+		}
+
+		SAFE_FREE(dbuf.dptr);
+		SAFE_FREE(ip_list);
+	}
+    
+	tdb_close(tdb);
+	DEBUG(2,("initialise_wins: done\n"));
+	return True;
+}
+
+/****************************************************************************
+Send a WINS WACK (Wait ACKnowledgement) response.
+**************************************************************************/
+
+static void send_wins_wack_response(int ttl, struct packet_struct *p)
+{
+  struct nmb_packet *nmb = &p->packet.nmb;
+  unsigned char rdata[2];
+
+  rdata[0] = rdata[1] = 0;
+
+  /* Taken from nmblib.c - we need to send back almost
+     identical bytes from the requesting packet header. */
+
+  rdata[0] = (nmb->header.opcode & 0xF) << 3;
+  if (nmb->header.nm_flags.authoritative &&
+      nmb->header.response) rdata[0] |= 0x4;
+  if (nmb->header.nm_flags.trunc) rdata[0] |= 0x2;
+  if (nmb->header.nm_flags.recursion_desired) rdata[0] |= 0x1;
+  if (nmb->header.nm_flags.recursion_available &&
+      nmb->header.response) rdata[1] |= 0x80;
+  if (nmb->header.nm_flags.bcast) rdata[1] |= 0x10;
+
+  reply_netbios_packet(p,                             /* Packet to reply to. */
+                       0,                             /* Result code. */
+                       NMB_WAIT_ACK,                  /* nmbd type code. */
+                       NMB_WACK_OPCODE,               /* opcode. */
+                       ttl,                           /* ttl. */
+                       (char *)rdata,                 /* data to send. */
+                       2);                            /* data length. */
+}
+
+/****************************************************************************
+Send a WINS name registration response.
+**************************************************************************/
+
+static void send_wins_name_registration_response(int rcode, int ttl, struct packet_struct *p)
+{
+  struct nmb_packet *nmb = &p->packet.nmb;
+  char rdata[6];
+
+  memcpy(&rdata[0], &nmb->additional->rdata[0], 6);
+
+  reply_netbios_packet(p,                             /* Packet to reply to. */
+                       rcode,                         /* Result code. */
+                       WINS_REG,                      /* nmbd type code. */
+                       NMB_NAME_REG_OPCODE,           /* opcode. */
+                       ttl,                           /* ttl. */
+                       rdata,                         /* data to send. */
+                       6);                            /* data length. */
+}
+
+/***********************************************************************
+ Deal with a name refresh request to a WINS server.
+************************************************************************/
+
+void wins_process_name_refresh_request(struct subnet_record *subrec,
+                                            struct packet_struct *p)
+{
+  struct nmb_packet *nmb = &p->packet.nmb;
+  struct nmb_name *question = &nmb->question.question_name;
+  BOOL bcast = nmb->header.nm_flags.bcast;
+  uint16 nb_flags = get_nb_flags(nmb->additional->rdata);
+  BOOL group = (nb_flags & NB_GROUP) ? True : False;
+  struct name_record *namerec = NULL;
+  int ttl = get_ttl_from_packet(nmb);
+  struct in_addr from_ip;
+  struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
+
+  putip((char *)&from_ip,&nmb->additional->rdata[2]);
+
+  if(bcast)
+  {
+    /*
+     * We should only get unicast name refresh packets here.
+     * Anyone trying to refresh broadcast should not be going to a WINS
+     * server. Log an error here.
+     */
+
+    DEBUG(0,("wins_process_name_refresh_request: broadcast name refresh request \
+received for name %s from IP %s on subnet %s. Error - should not be sent to WINS server\n",
+          nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
+    return;
+  }
+
+  DEBUG(3,("wins_process_name_refresh_request: Name refresh for name %s \
+IP %s\n", nmb_namestr(question), inet_ntoa(from_ip) ));
+
+  /* 
+   * See if the name already exists.
+   */
+
+  namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
+
+  /*
+   * If this is a refresh request and the name doesn't exist then
+   * treat it like a registration request. This allows us to recover 
+   * from errors (tridge)
+   */
+
+  if(namerec == NULL)
+  {
+    DEBUG(3,("wins_process_name_refresh_request: Name refresh for name %s and \
+the name does not exist. Treating as registration.\n", nmb_namestr(question) ));
+    wins_process_name_registration_request(subrec,p);
+    return;
+  }
+
+  /*
+   * if the name is present but not active,
+   * simply remove it and treat the request
+   * as a registration
+   */
+  if (namerec != NULL && !WINS_STATE_ACTIVE(namerec))
+  {
+    DEBUG(5,("wins_process_name_refresh_request: Name (%s) in WINS was \
+not active - removing it.\n", nmb_namestr(question) ));
+    remove_name_from_namelist( subrec, namerec );
+    namerec = NULL;
+    wins_process_name_registration_request(subrec,p);
+    return;
+  }
+
+  /*
+   * Check that the group bits for the refreshing name and the
+   * name in our database match.
+   */
+
+  if((namerec != NULL) && ((group && !NAME_GROUP(namerec)) || (!group && NAME_GROUP(namerec))) )
+  {
+    DEBUG(3,("wins_process_name_refresh_request: Name %s group bit = %s \
+does not match group bit in WINS for this name.\n", nmb_namestr(question), group ? "True" : "False" ));
+    send_wins_name_registration_response(RFS_ERR, 0, p);
+    return;
+  }
+
+  /*
+   * For a unique name check that the person refreshing the name is one of the registered IP
+   * addresses. If not - fail the refresh. Do the same for group names with a type of 0x1c.
+   * Just return success for unique 0x1d refreshes. For normal group names update the ttl
+   * and return success.
+   */
+
+  if((!group || (group && (question->name_type == 0x1c))) && find_ip_in_name_record(namerec, from_ip ))
+  {
+    /*
+     * Update the ttl.
+     */
+    update_name_ttl(namerec, ttl);
+
+    /*
+     * if the record is a replica:
+     * we take ownership and update the version ID.
+     */
+    if (!ip_equal(namerec->data.wins_ip, our_fake_ip)) {
+    	update_wins_owner(namerec, our_fake_ip);
+	get_global_id_and_update(&namerec->data.id, True);
+    }
+
+    send_wins_name_registration_response(0, ttl, p);
+    wins_hook("refresh", namerec, ttl);
+    return;
+  }
+  else if(group)
+  {
+    /* 
+     * Normal groups are all registered with an IP address of 255.255.255.255 
+     * so we can't search for the IP address.
+     */
+    update_name_ttl(namerec, ttl);
+    send_wins_name_registration_response(0, ttl, p);
+    return;
+  }
+  else if(!group && (question->name_type == 0x1d))
+  {
+    /*
+     * Special name type - just pretend the refresh succeeded.
+     */
+    send_wins_name_registration_response(0, ttl, p);
+    return;
+  }
+  else
+  {
+    /*
+     * Fail the refresh.
+     */
+
+    DEBUG(3,("wins_process_name_refresh_request: Name refresh for name %s with IP %s and \
+is IP is not known to the name.\n", nmb_namestr(question), inet_ntoa(from_ip) ));
+    send_wins_name_registration_response(RFS_ERR, 0, p);
+    return;
+  }
+}
+
+/***********************************************************************
+ Deal with a name registration request query success to a client that
+ owned the name.
+
+ We have a locked pointer to the original packet stashed away in the
+ userdata pointer. The success here is actually a failure as it means
+ the client we queried wants to keep the name, so we must return
+ a registration failure to the original requestor.
+************************************************************************/
+
+static void wins_register_query_success(struct subnet_record *subrec,
+                                             struct userdata_struct *userdata,
+                                             struct nmb_name *question_name,
+                                             struct in_addr ip,
+                                             struct res_rec *answers)
+{
+  struct packet_struct *orig_reg_packet;
+
+  memcpy((char *)&orig_reg_packet, userdata->data, sizeof(struct packet_struct *));
+
+  DEBUG(3,("wins_register_query_success: Original client at IP %s still wants the \
+name %s. Rejecting registration request.\n", inet_ntoa(ip), nmb_namestr(question_name) ));
+
+  send_wins_name_registration_response(RFS_ERR, 0, orig_reg_packet);
+
+  orig_reg_packet->locked = False;
+  free_packet(orig_reg_packet);
+}
+
+/***********************************************************************
+ Deal with a name registration request query failure to a client that
+ owned the name.
+
+ We have a locked pointer to the original packet stashed away in the
+ userdata pointer. The failure here is actually a success as it means
+ the client we queried didn't want to keep the name, so we can remove
+ the old name record and then successfully add the new name.
+************************************************************************/
+
+static void wins_register_query_fail(struct subnet_record *subrec,
+                                          struct response_record *rrec,
+                                          struct nmb_name *question_name,
+                                          int rcode)
+{
+  struct userdata_struct *userdata = rrec->userdata;
+  struct packet_struct *orig_reg_packet;
+  struct name_record *namerec = NULL;
+
+  memcpy((char *)&orig_reg_packet, userdata->data, sizeof(struct packet_struct *));
+
+  /*
+   * We want to just add the name, as we now know the original owner
+   * didn't want it. But we can't just do that as an arbitary
+   * amount of time may have taken place between the name query
+   * request and this timeout/error response. So we check that
+   * the name still exists and is in the same state - if so
+   * we remove it and call wins_process_name_registration_request()
+   * as we know it will do the right thing now.
+   */
+
+  namerec = find_name_on_subnet(subrec, question_name, FIND_ANY_NAME);
+
+  if( (namerec != NULL)
+   && (namerec->data.source == REGISTER_NAME)
+   && ip_equal(rrec->packet->ip, *namerec->data.ip) )
+  {
+    remove_name_from_namelist( subrec, namerec);
+    namerec = NULL;
+  }
+
+  if(namerec == NULL)
+    wins_process_name_registration_request(subrec, orig_reg_packet);
+  else
+    DEBUG(2,("wins_register_query_fail: The state of the WINS database changed between \
+querying for name %s in order to replace it and this reply.\n", nmb_namestr(question_name) ));
+
+  orig_reg_packet->locked = False;
+  free_packet(orig_reg_packet);
+}
+
+/***********************************************************************
+ Deal with a name registration request to a WINS server.
+
+ Use the following pseudocode :
+
+ registering_group
+     |
+     |
+     +--------name exists
+     |                  |
+     |                  |
+     |                  +--- existing name is group
+     |                  |                      |
+     |                  |                      |
+     |                  |                      +--- add name (return).
+     |                  |
+     |                  |
+     |                  +--- exiting name is unique
+     |                                         |
+     |                                         |
+     |                                         +--- query existing owner (return).
+     |
+     |
+     +--------name doesn't exist
+                        |
+                        |
+                        +--- add name (return).
+
+ registering_unique
+     |
+     |
+     +--------name exists
+     |                  |
+     |                  |
+     |                  +--- existing name is group 
+     |                  |                      |
+     |                  |                      |
+     |                  |                      +--- fail add (return).
+     |                  | 
+     |                  |
+     |                  +--- exiting name is unique
+     |                                         |
+     |                                         |
+     |                                         +--- query existing owner (return).
+     |
+     |
+     +--------name doesn't exist
+                        |
+                        |
+                        +--- add name (return).
+
+ As can be seen from the above, the two cases may be collapsed onto each
+ other with the exception of the case where the name already exists and
+ is a group name. This case we handle with an if statement.
+ 
+************************************************************************/
+
+void wins_process_name_registration_request(struct subnet_record *subrec,
+                                            struct packet_struct *p)
+{
+  struct nmb_packet *nmb = &p->packet.nmb;
+  struct nmb_name *question = &nmb->question.question_name;
+  BOOL bcast = nmb->header.nm_flags.bcast;
+  uint16 nb_flags = get_nb_flags(nmb->additional->rdata);
+  int ttl = get_ttl_from_packet(nmb);
+  struct name_record *namerec = NULL;
+  struct in_addr from_ip;
+  BOOL registering_group_name = (nb_flags & NB_GROUP) ? True : False;
+  struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
+
+  putip((char *)&from_ip,&nmb->additional->rdata[2]);
+
+  if(bcast)
+  {
+    /*
+     * We should only get unicast name registration packets here.
+     * Anyone trying to register broadcast should not be going to a WINS
+     * server. Log an error here.
+     */
+
+    DEBUG(0,("wins_process_name_registration_request: broadcast name registration request \
+received for name %s from IP %s on subnet %s. Error - should not be sent to WINS server\n",
+          nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
+    return;
+  }
+
+  DEBUG(3,("wins_process_name_registration_request: %s name registration for name %s \
+IP %s\n", registering_group_name ? "Group" : "Unique", nmb_namestr(question), inet_ntoa(from_ip) ));
+
+  /*
+   * See if the name already exists.
+   */
+
+  namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
+
+  /*
+   * if the record exists but NOT in active state,
+   * consider it dead.
+   */
+  if ( (namerec != NULL) && !WINS_STATE_ACTIVE(namerec))
+  {
+    DEBUG(5,("wins_process_name_registration_request: Name (%s) in WINS was \
+not active - removing it.\n", nmb_namestr(question) ));
+    remove_name_from_namelist( subrec, namerec );
+    namerec = NULL;
+  }
+
+  /*
+   * Deal with the case where the name found was a dns entry.
+   * Remove it as we now have a NetBIOS client registering the
+   * name.
+   */
+
+  if( (namerec != NULL)
+   && ( (namerec->data.source == DNS_NAME)
+     || (namerec->data.source == DNSFAIL_NAME) ) )
+  {
+    DEBUG(5,("wins_process_name_registration_request: Name (%s) in WINS was \
+a dns lookup - removing it.\n", nmb_namestr(question) ));
+    remove_name_from_namelist( subrec, namerec );
+    namerec = NULL;
+  }
+
+  /*
+   * Reject if the name exists and is not a REGISTER_NAME.
+   * (ie. Don't allow any static names to be overwritten.
+   */
+
+  if((namerec != NULL) && (namerec->data.source != REGISTER_NAME))
+  {
+    DEBUG( 3, ( "wins_process_name_registration_request: Attempt \
+to register name %s. Name already exists in WINS with source type %d.\n",
+                nmb_namestr(question), namerec->data.source ));
+    send_wins_name_registration_response(RFS_ERR, 0, p);
+    return;
+  }
+
+  /*
+   * Special policy decisions based on MS documentation.
+   * 1). All group names (except names ending in 0x1c) are added as 255.255.255.255.
+   * 2). All unique names ending in 0x1d are ignored, although a positive response is sent.
+   */
+
+  /*
+   * A group name is always added as the local broadcast address, except
+   * for group names ending in 0x1c.
+   * Group names with type 0x1c are registered with individual IP addresses.
+   */
+
+  if(registering_group_name && (question->name_type != 0x1c))
+    from_ip = *interpret_addr2("255.255.255.255");
+
+  /*
+   * Ignore all attempts to register a unique 0x1d name, although return success.
+   */
+
+  if(!registering_group_name && (question->name_type == 0x1d))
+  {
+    DEBUG(3,("wins_process_name_registration_request: Ignoring request \
+to register name %s from IP %s.\n", nmb_namestr(question), inet_ntoa(p->ip) ));
+    send_wins_name_registration_response(0, ttl, p);
+    return;
+  }
+
+  /*
+   * Next two cases are the 'if statement' mentioned above.
+   */
+
+  if((namerec != NULL) && NAME_GROUP(namerec))
+  {
+    if(registering_group_name)
+    {
+      /*
+       * If we are adding a group name, the name exists and is also a group entry just add this
+       * IP address to it and update the ttl.
+       */
+
+      DEBUG(3,("wins_process_name_registration_request: Adding IP %s to group name %s.\n",
+            inet_ntoa(from_ip), nmb_namestr(question) ));
+      /* 
+       * Check the ip address is not already in the group.
+       */
+      if(!find_ip_in_name_record(namerec, from_ip)) {
+        add_ip_to_name_record(namerec, from_ip);
+	/* we need to update the record for replication */
+        get_global_id_and_update(&namerec->data.id, True);
+
+	/*
+	 * if the record is a replica, we must change
+	 * the wins owner to us to make the replication updates
+	 * it on the other wins servers.
+	 * And when the partner will receive this record,
+	 * it will update its own record.
+	 */
+
+	update_wins_owner(namerec, our_fake_ip);
+
+      }
+      update_name_ttl(namerec, ttl);
+      send_wins_name_registration_response(0, ttl, p);
+      return;
+    }
+    else
+    {
+      /*
+       * If we are adding a unique name, the name exists in the WINS db 
+       * and is a group name then reject the registration.
+       *
+       * explanation: groups have a higher priority than unique names.
+       */
+
+      DEBUG(3,("wins_process_name_registration_request: Attempt to register name %s. Name \
+already exists in WINS as a GROUP name.\n", nmb_namestr(question) ));
+      send_wins_name_registration_response(RFS_ERR, 0, p);
+      return;
+    } 
+  }
+
+  /*
+   * From here on down we know that if the name exists in the WINS db it is
+   * a unique name, not a group name.
+   */
+
+  /* 
+   * If the name exists and is one of our names then check the
+   * registering IP address. If it's not one of ours then automatically
+   * reject without doing the query - we know we will reject it.
+   */
+
+  if((namerec != NULL) && (is_myname(namerec->name.name)) )
+  {
+    if(!ismyip(from_ip))
+    {
+      DEBUG(3,("wins_process_name_registration_request: Attempt to register name %s. Name \
+is one of our (WINS server) names. Denying registration.\n", nmb_namestr(question) ));
+      send_wins_name_registration_response(RFS_ERR, 0, p);
+      return;
+    }
+    else
+    {
+      /*
+       * It's one of our names and one of our IP's - update the ttl.
+       */
+      update_name_ttl(namerec, ttl);
+      send_wins_name_registration_response(0, ttl, p);
+      wins_hook("refresh", namerec, ttl);
+      return;
+    }
+  }
+
+  /*
+   * If the name exists and it is a unique registration and the registering IP 
+   * is the same as the (single) already registered IP then just update the ttl.
+   *
+   * But not if the record is an active replica. IF it's a replica, it means it can be
+   * the same client which has moved and not yet expired. So we don't update
+   * the ttl in this case and go beyond to do a WACK and query the old client
+   */
+
+  if( !registering_group_name
+   && (namerec != NULL)
+   && (namerec->data.num_ips == 1)
+   && ip_equal( namerec->data.ip[0], from_ip )
+   && ip_equal(namerec->data.wins_ip, our_fake_ip) )
+  {
+    update_name_ttl( namerec, ttl );
+    send_wins_name_registration_response( 0, ttl, p );
+    wins_hook("refresh", namerec, ttl);
+    return;
+  }
+
+  /*
+   * Finally if the name exists do a query to the registering machine 
+   * to see if they still claim to have the name.
+   */
+
+  if( namerec != NULL )
+  {
+    long *ud[(sizeof(struct userdata_struct) + sizeof(struct packet_struct *))/sizeof(long *) + 1];
+    struct userdata_struct *userdata = (struct userdata_struct *)ud;
+
+    /*
+     * First send a WACK to the registering machine.
+     */
+
+    send_wins_wack_response(60, p);
+
+    /*
+     * When the reply comes back we need the original packet.
+     * Lock this so it won't be freed and then put it into
+     * the userdata structure.
+     */
+
+    p->locked = True;
+
+    userdata = (struct userdata_struct *)ud;
+
+    userdata->copy_fn = NULL;
+    userdata->free_fn = NULL;
+    userdata->userdata_len = sizeof(struct packet_struct *);
+    memcpy(userdata->data, (char *)&p, sizeof(struct packet_struct *) );
+
+    /*
+     * Use the new call to send a query directly to an IP address.
+     * This sends the query directly to the IP address, and ensures
+     * the recursion desired flag is not set (you were right Luke :-).
+     * This function should *only* be called from the WINS server
+     * code. JRA.
+     */
+
+    query_name_from_wins_server( *namerec->data.ip,
+                                  question->name,
+                                  question->name_type, 
+                                  wins_register_query_success,
+                                  wins_register_query_fail,
+                                  userdata );
+    return;
+  }
+
+  /*
+   * Name did not exist - add it.
+   */
+
+  (void)add_name_to_subnet( subrec, question->name, question->name_type,
+                            nb_flags, ttl, REGISTER_NAME, 1, &from_ip);
+  if ((namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME))) {
+	get_global_id_and_update(&namerec->data.id, True);
+	update_wins_owner(namerec, our_fake_ip);
+	update_wins_flag(namerec, WINS_ACTIVE);
+	wins_hook("add", namerec, ttl);
+  }
+
+  send_wins_name_registration_response(0, ttl, p);
+}
+
+/***********************************************************************
+ Deal with a mutihomed name query success to the machine that
+ requested the multihomed name registration.
+
+ We have a locked pointer to the original packet stashed away in the
+ userdata pointer.
+************************************************************************/
+
+static void wins_multihomed_register_query_success(struct subnet_record *subrec,
+                                             struct userdata_struct *userdata,
+                                             struct nmb_name *question_name,
+                                             struct in_addr ip,
+                                             struct res_rec *answers)
+{
+  struct packet_struct *orig_reg_packet;
+  struct nmb_packet *nmb;
+  struct name_record *namerec = NULL;
+  struct in_addr from_ip;
+  int ttl;
+  struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
+
+  memcpy((char *)&orig_reg_packet, userdata->data, sizeof(struct packet_struct *));
+
+  nmb = &orig_reg_packet->packet.nmb;
+
+  putip((char *)&from_ip,&nmb->additional->rdata[2]);
+  ttl = get_ttl_from_packet(nmb);
+
+  /*
+   * We want to just add the new IP, as we now know the requesting
+   * machine claims to own it. But we can't just do that as an arbitary
+   * amount of time may have taken place between the name query
+   * request and this response. So we check that
+   * the name still exists and is in the same state - if so
+   * we just add the extra IP and update the ttl.
+   */
+
+  namerec = find_name_on_subnet(subrec, question_name, FIND_ANY_NAME);
+
+  if( (namerec == NULL) || (namerec->data.source != REGISTER_NAME) || !WINS_STATE_ACTIVE(namerec) )
+  {
+    DEBUG(3,("wins_multihomed_register_query_success: name %s is not in the correct state to add \
+a subsequent IP address.\n", nmb_namestr(question_name) ));
+    send_wins_name_registration_response(RFS_ERR, 0, orig_reg_packet);
+
+    orig_reg_packet->locked = False;
+    free_packet(orig_reg_packet);
+
+    return;
+  }
+
+  if(!find_ip_in_name_record(namerec, from_ip))
+    add_ip_to_name_record(namerec, from_ip);
+
+  get_global_id_and_update(&namerec->data.id, True);
+  update_wins_owner(namerec, our_fake_ip);
+  update_wins_flag(namerec, WINS_ACTIVE);
+  update_name_ttl(namerec, ttl);
+  send_wins_name_registration_response(0, ttl, orig_reg_packet);
+  wins_hook("add", namerec, ttl);
+
+  orig_reg_packet->locked = False;
+  free_packet(orig_reg_packet);
+}
+
+/***********************************************************************
+ Deal with a name registration request query failure to a client that
+ owned the name.
+
+ We have a locked pointer to the original packet stashed away in the
+ userdata pointer.
+************************************************************************/
+
+static void wins_multihomed_register_query_fail(struct subnet_record *subrec,
+                                          struct response_record *rrec,
+                                          struct nmb_name *question_name,
+                                          int rcode)
+{
+  struct userdata_struct *userdata = rrec->userdata;
+  struct packet_struct *orig_reg_packet;
+
+  memcpy((char *)&orig_reg_packet, userdata->data, sizeof(struct packet_struct *));
+
+  DEBUG(3,("wins_multihomed_register_query_fail: Registering machine at IP %s failed to answer \
+query successfully for name %s.\n", inet_ntoa(orig_reg_packet->ip), nmb_namestr(question_name) ));
+  send_wins_name_registration_response(RFS_ERR, 0, orig_reg_packet);
+
+  orig_reg_packet->locked = False;
+  free_packet(orig_reg_packet);
+  return;
+}
+
+/***********************************************************************
+ Deal with a multihomed name registration request to a WINS server.
+ These cannot be group name registrations.
+***********************************************************************/
+
+void wins_process_multihomed_name_registration_request( struct subnet_record *subrec,
+                                                        struct packet_struct *p)
+{
+  struct nmb_packet *nmb = &p->packet.nmb;
+  struct nmb_name *question = &nmb->question.question_name;
+  BOOL bcast = nmb->header.nm_flags.bcast;
+  uint16 nb_flags = get_nb_flags(nmb->additional->rdata);
+  int ttl = get_ttl_from_packet(nmb);
+  struct name_record *namerec = NULL;
+  struct in_addr from_ip;
+  BOOL group = (nb_flags & NB_GROUP) ? True : False;
+  struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
+
+  putip((char *)&from_ip,&nmb->additional->rdata[2]);
+
+  if(bcast)
+  {
+    /*
+     * We should only get unicast name registration packets here.
+     * Anyone trying to register broadcast should not be going to a WINS
+     * server. Log an error here.
+     */
+
+    DEBUG(0,("wins_process_multihomed_name_registration_request: broadcast name registration request \
+received for name %s from IP %s on subnet %s. Error - should not be sent to WINS server\n",
+          nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
+    return;
+  }
+
+  /*
+   * Only unique names should be registered multihomed.
+   */
+
+  if(group)
+  {
+    DEBUG(0,("wins_process_multihomed_name_registration_request: group name registration request \
+received for name %s from IP %s on subnet %s. Errror - group names should not be multihomed.\n",
+          nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
+    return;
+  }
+
+  DEBUG(3,("wins_process_multihomed_name_registration_request: name registration for name %s \
+IP %s\n", nmb_namestr(question), inet_ntoa(from_ip) ));
+
+  /*
+   * Deal with policy regarding 0x1d names.
+   */
+
+  if(question->name_type == 0x1d)
+  {
+    DEBUG(3,("wins_process_multihomed_name_registration_request: Ignoring request \
+to register name %s from IP %s.", nmb_namestr(question), inet_ntoa(p->ip) ));
+    send_wins_name_registration_response(0, ttl, p);  
+    return;
+  }
+
+  /*
+   * See if the name already exists.
+   */
+
+  namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
+
+  /*
+   * if the record exists but NOT in active state,
+   * consider it dead.
+   */
+  if ((namerec != NULL) && !WINS_STATE_ACTIVE(namerec)) {
+	  DEBUG(5,("wins_process_multihomed_name_registration_request: Name (%s) in WINS was not active - removing it.\n", nmb_namestr(question)));
+	  remove_name_from_namelist(subrec, namerec);
+	  namerec = NULL;
+  }
+  
+  /*
+   * Deal with the case where the name found was a dns entry.
+   * Remove it as we now have a NetBIOS client registering the
+   * name.
+   */
+
+  if( (namerec != NULL)
+   && ( (namerec->data.source == DNS_NAME)
+     || (namerec->data.source == DNSFAIL_NAME) ) )
+  {
+    DEBUG(5,("wins_process_multihomed_name_registration_request: Name (%s) in WINS was a dns lookup \
+- removing it.\n", nmb_namestr(question) ));
+    remove_name_from_namelist( subrec, namerec);
+    namerec = NULL;
+  }
+
+  /*
+   * Reject if the name exists and is not a REGISTER_NAME.
+   * (ie. Don't allow any static names to be overwritten.
+   */
+
+  if( (namerec != NULL) && (namerec->data.source != REGISTER_NAME) )
+  {
+    DEBUG( 3, ( "wins_process_multihomed_name_registration_request: Attempt \
+to register name %s. Name already exists in WINS with source type %d.\n",
+    nmb_namestr(question), namerec->data.source ));
+    send_wins_name_registration_response(RFS_ERR, 0, p);
+    return;
+  }
+
+  /*
+   * Reject if the name exists and is a GROUP name and is active.
+   */
+
+  if((namerec != NULL) && NAME_GROUP(namerec) && WINS_STATE_ACTIVE(namerec))
+  {
+    DEBUG(3,("wins_process_multihomed_name_registration_request: Attempt to register name %s. Name \
+already exists in WINS as a GROUP name.\n", nmb_namestr(question) ));
+    send_wins_name_registration_response(RFS_ERR, 0, p);
+    return;
+  } 
+
+  /*
+   * From here on down we know that if the name exists in the WINS db it is
+   * a unique name, not a group name.
+   */
+
+  /*
+   * If the name exists and is one of our names then check the
+   * registering IP address. If it's not one of ours then automatically
+   * reject without doing the query - we know we will reject it.
+   */
+
+  if((namerec != NULL) && (is_myname(namerec->name.name)) )
+  {
+    if(!ismyip(from_ip))
+    {
+      DEBUG(3,("wins_process_multihomed_name_registration_request: Attempt to register name %s. Name \
+is one of our (WINS server) names. Denying registration.\n", nmb_namestr(question) ));
+      send_wins_name_registration_response(RFS_ERR, 0, p);
+      return;
+    }
+    else
+    {
+      /*
+       * It's one of our names and one of our IP's. Ensure the IP is in the record and
+       *  update the ttl. Update the version ID to force replication.
+       */
+	    if(!find_ip_in_name_record(namerec, from_ip)) {
+		    get_global_id_and_update(&namerec->data.id, True);
+		    update_wins_owner(namerec, our_fake_ip);
+		    update_wins_flag(namerec, WINS_ACTIVE);
+
+		    add_ip_to_name_record(namerec, from_ip);
+		    wins_hook("add", namerec, ttl);
+	    } else {
+		    wins_hook("refresh", namerec, ttl);
+	    }
+
+	    update_name_ttl(namerec, ttl);
+	    send_wins_name_registration_response(0, ttl, p);
+	    return;
+    }
+  }
+
+  /*
+   * If the name exists and is active, check if the IP address is already registered
+   * to that name. If so then update the ttl and reply success.
+   */
+
+  if((namerec != NULL) && find_ip_in_name_record(namerec, from_ip) && WINS_STATE_ACTIVE(namerec))
+  {
+    update_name_ttl(namerec, ttl);
+    /*
+     * If it's a replica, we need to become the wins owner
+     * to force the replication
+     */
+    if (!ip_equal(namerec->data.wins_ip, our_fake_ip)) {
+      get_global_id_and_update(&namerec->data.id, True);
+      update_wins_owner(namerec, our_fake_ip);
+      update_wins_flag(namerec, WINS_ACTIVE);
+    }
+    
+    send_wins_name_registration_response(0, ttl, p);
+    wins_hook("refresh", namerec, ttl);
+    return;
+  }
+
+  /*
+   * If the name exists do a query to the owner
+   * to see if they still want the name.
+   */
+
+  if(namerec != NULL)
+  {
+    long *ud[(sizeof(struct userdata_struct) + sizeof(struct packet_struct *))/sizeof(long *) + 1];
+    struct userdata_struct *userdata = (struct userdata_struct *)ud;
+
+    /*
+     * First send a WACK to the registering machine.
+     */
+
+    send_wins_wack_response(60, p);
+
+    /*
+     * When the reply comes back we need the original packet.
+     * Lock this so it won't be freed and then put it into
+     * the userdata structure.
+     */
+
+    p->locked = True;
+
+    userdata = (struct userdata_struct *)ud;
+
+    userdata->copy_fn = NULL;
+    userdata->free_fn = NULL;
+    userdata->userdata_len = sizeof(struct packet_struct *);
+    memcpy(userdata->data, (char *)&p, sizeof(struct packet_struct *) );
+
+    /* 
+     * Use the new call to send a query directly to an IP address.
+     * This sends the query directly to the IP address, and ensures
+     * the recursion desired flag is not set (you were right Luke :-).
+     * This function should *only* be called from the WINS server
+     * code. JRA.
+     *
+     * Note that this packet is sent to the current owner of the name,
+     * not the person who sent the packet 
+     */
+
+    query_name_from_wins_server( namerec->data.ip[0],
+                                 question->name,
+                                 question->name_type, 
+                                 wins_multihomed_register_query_success,
+                                 wins_multihomed_register_query_fail,
+                                 userdata );
+
+    return;
+  }
+
+  /*
+   * Name did not exist - add it.
+   */
+
+  (void)add_name_to_subnet( subrec, question->name, question->name_type,
+                            nb_flags, ttl, REGISTER_NAME, 1, &from_ip);
+
+  if ((namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME))) {
+	  get_global_id_and_update(&namerec->data.id, True);
+	  update_wins_owner(namerec, our_fake_ip);
+	  update_wins_flag(namerec, WINS_ACTIVE);
+	  wins_hook("add", namerec, ttl);
+  }
+
+  send_wins_name_registration_response(0, ttl, p);
+}
+
+/***********************************************************************
+ Deal with the special name query for *<1b>.
+***********************************************************************/
+   
+static void process_wins_dmb_query_request(struct subnet_record *subrec,  
+                                           struct packet_struct *p)
+{  
+  struct name_record *namerec = NULL;
+  char *prdata;
+  int num_ips;
+
+  /*
+   * Go through all the ACTIVE names in the WINS db looking for those
+   * ending in <1b>. Use this to calculate the number of IP
+   * addresses we need to return.
+   */
+
+  num_ips = 0;
+  for( namerec = (struct name_record *)ubi_trFirst( subrec->namelist );
+       namerec;
+       namerec = (struct name_record *)ubi_trNext( namerec ) )
+  {
+    if(WINS_STATE_ACTIVE(namerec) && namerec->name.name_type == 0x1b )
+      num_ips += namerec->data.num_ips;
+  }
+
+  if(num_ips == 0)
+  {
+    /*
+     * There are no 0x1b names registered. Return name query fail.
+     */
+    send_wins_name_query_response(NAM_ERR, p, NULL);
+    return;
+  }
+
+  if((prdata = (char *)malloc( num_ips * 6 )) == NULL)
+  {
+    DEBUG(0,("process_wins_dmb_query_request: Malloc fail !.\n"));
+    return;
+  }
+
+  /*
+   * Go through all the names again in the WINS db looking for those
+   * ending in <1b>. Add their IP addresses into the list we will
+   * return.
+   */ 
+
+  num_ips = 0;
+  for( namerec = (struct name_record *)ubi_trFirst( subrec->namelist );
+       namerec;
+       namerec = (struct name_record *)ubi_trNext( namerec ) )
+  {
+    if(WINS_STATE_ACTIVE(namerec) && namerec->name.name_type == 0x1b)
+    {
+      int i;
+      for(i = 0; i < namerec->data.num_ips; i++)
+      {
+        set_nb_flags(&prdata[num_ips * 6],namerec->data.nb_flags);
+        putip((char *)&prdata[(num_ips * 6) + 2], &namerec->data.ip[i]);
+        num_ips++;
+      }
+    }
+  }
+
+  /*
+   * Send back the reply containing the IP list.
+   */
+
+  reply_netbios_packet(p,                             /* Packet to reply to. */
+                       0,                             /* Result code. */
+                       WINS_QUERY,                    /* nmbd type code. */
+                       NMB_NAME_QUERY_OPCODE,         /* opcode. */
+                       lp_min_wins_ttl(),             /* ttl. */
+                       prdata,                        /* data to send. */
+                       num_ips*6);                    /* data length. */
+
+  SAFE_FREE(prdata);
+}
+
+/****************************************************************************
+Send a WINS name query response.
+**************************************************************************/
+
+void send_wins_name_query_response(int rcode, struct packet_struct *p, 
+                                          struct name_record *namerec)
+{
+  char rdata[6];
+  char *prdata = rdata;
+  int reply_data_len = 0;
+  int ttl = 0;
+  int i;
+
+  memset(rdata,'\0',6);
+
+  if(rcode == 0)
+  {
+    ttl = (namerec->data.death_time != PERMANENT_TTL) ?
+             namerec->data.death_time - p->timestamp : lp_max_wins_ttl();
+
+    /* Copy all known ip addresses into the return data. */
+    /* Optimise for the common case of one IP address so
+       we don't need a malloc. */
+
+    if( namerec->data.num_ips == 1 )
+      prdata = rdata;
+    else
+    {
+      if((prdata = (char *)malloc( namerec->data.num_ips * 6 )) == NULL)
+      {
+        DEBUG(0,("send_wins_name_query_response: malloc fail !\n"));
+        return;
+      }
+    }
+
+    for(i = 0; i < namerec->data.num_ips; i++)
+    {
+      set_nb_flags(&prdata[i*6],namerec->data.nb_flags);
+      putip((char *)&prdata[2+(i*6)], &namerec->data.ip[i]);
+    }
+
+    sort_query_replies(prdata, i, p->ip);
+
+    reply_data_len = namerec->data.num_ips * 6;
+  }
+
+  reply_netbios_packet(p,                             /* Packet to reply to. */
+                       rcode,                         /* Result code. */
+                       WINS_QUERY,                    /* nmbd type code. */
+                       NMB_NAME_QUERY_OPCODE,         /* opcode. */
+                       ttl,                           /* ttl. */
+                       prdata,                        /* data to send. */
+                       reply_data_len);               /* data length. */
+
+  if(prdata != rdata)
+    SAFE_FREE(prdata);
+}
+
+/***********************************************************************
+ Deal with a name query.
+***********************************************************************/
+
+void wins_process_name_query_request(struct subnet_record *subrec, 
+                                     struct packet_struct *p)
+{
+  struct nmb_packet *nmb = &p->packet.nmb;
+  struct nmb_name *question = &nmb->question.question_name;
+  struct name_record *namerec = NULL;
+
+  DEBUG(3,("wins_process_name_query: name query for name %s from IP %s\n", 
+            nmb_namestr(question), inet_ntoa(p->ip) ));
+
+  /*
+   * Special name code. If the queried name is *<1b> then search
+   * the entire WINS database and return a list of all the IP addresses
+   * registered to any <1b> name. This is to allow domain master browsers
+   * to discover other domains that may not have a presence on their subnet.
+   */
+
+  if(strequal( question->name, "*") && (question->name_type == 0x1b))
+  {
+    process_wins_dmb_query_request( subrec, p);
+    return;
+  }
+
+  namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
+
+  if(namerec != NULL)
+  {
+    /*
+     * If the name is not anymore in active state then reply not found.
+     * it's fair even if we keep it in the cache for days.
+     */
+    if (!WINS_STATE_ACTIVE(namerec))
+    {
+      DEBUG(3,("wins_process_name_query: name query for name %s - name expired. Returning fail.\n",
+             nmb_namestr(question) ));
+      send_wins_name_query_response(NAM_ERR, p, namerec);
+      return;
+    }
+    /* 
+     * If it's a DNSFAIL_NAME then reply name not found.
+     */
+
+    if( namerec->data.source == DNSFAIL_NAME )
+    {
+      DEBUG(3,("wins_process_name_query: name query for name %s returning DNS fail.\n",
+             nmb_namestr(question) ));
+      send_wins_name_query_response(NAM_ERR, p, namerec);
+      return;
+    }
+
+    /*
+     * If the name has expired then reply name not found.
+     */
+
+    if( (namerec->data.death_time != PERMANENT_TTL)
+     && (namerec->data.death_time < p->timestamp) )
+    {
+      DEBUG(3,("wins_process_name_query: name query for name %s - name expired. Returning fail.\n",
+                nmb_namestr(question) ));
+      send_wins_name_query_response(NAM_ERR, p, namerec);
+      return;
+    }
+
+    DEBUG(3,("wins_process_name_query: name query for name %s returning first IP %s.\n",
+           nmb_namestr(question), inet_ntoa(namerec->data.ip[0]) ));
+
+    send_wins_name_query_response(0, p, namerec);
+    return;
+  }
+
+  /* 
+   * Name not found in WINS - try a dns query if it's a 0x20 name.
+   */
+
+  if(lp_dns_proxy() && 
+     ((question->name_type == 0x20) || question->name_type == 0))
+  {
+
+    DEBUG(3,("wins_process_name_query: name query for name %s not found - doing dns lookup.\n",
+              nmb_namestr(question) ));
+
+    queue_dns_query(p, question, &namerec);
+    return;
+  }
+
+  /*
+   * Name not found - return error.
+   */
+
+  send_wins_name_query_response(NAM_ERR, p, NULL);
+}
+
+/****************************************************************************
+Send a WINS name release response.
+**************************************************************************/
+
+static void send_wins_name_release_response(int rcode, struct packet_struct *p)
+{
+  struct nmb_packet *nmb = &p->packet.nmb;
+  char rdata[6];
+
+  memcpy(&rdata[0], &nmb->additional->rdata[0], 6);
+
+  reply_netbios_packet(p,                            /* Packet to reply to. */
+                       rcode,                        /* Result code. */
+                       NMB_REL,                      /* nmbd type code. */
+                       NMB_NAME_RELEASE_OPCODE,      /* opcode. */
+                       0,                            /* ttl. */
+                       rdata,                        /* data to send. */
+                       6);                           /* data length. */
+}
+
+/***********************************************************************
+ Deal with a name release.
+***********************************************************************/
+
+void wins_process_name_release_request(struct subnet_record *subrec,
+                                       struct packet_struct *p)
+{
+  struct nmb_packet *nmb = &p->packet.nmb;
+  struct nmb_name *question = &nmb->question.question_name;
+  BOOL bcast = nmb->header.nm_flags.bcast;
+  uint16 nb_flags = get_nb_flags(nmb->additional->rdata);
+  struct name_record *namerec = NULL;
+  struct in_addr from_ip;
+  BOOL releasing_group_name = (nb_flags & NB_GROUP) ? True : False;;
+
+  putip((char *)&from_ip,&nmb->additional->rdata[2]);
+
+  if(bcast)
+  {
+    /*
+     * We should only get unicast name registration packets here.
+     * Anyone trying to register broadcast should not be going to a WINS
+     * server. Log an error here.
+     */
+
+    DEBUG(0,("wins_process_name_release_request: broadcast name registration request \
+received for name %s from IP %s on subnet %s. Error - should not be sent to WINS server\n",
+          nmb_namestr(question), inet_ntoa(from_ip), subrec->subnet_name));
+    return;
+  }
+  
+  DEBUG(3,("wins_process_name_release_request: %s name release for name %s \
+IP %s\n", releasing_group_name ? "Group" : "Unique", nmb_namestr(question), inet_ntoa(from_ip) ));
+    
+  /*
+   * Deal with policy regarding 0x1d names.
+   */
+
+  if(!releasing_group_name && (question->name_type == 0x1d))
+  {
+    DEBUG(3,("wins_process_name_release_request: Ignoring request \
+to release name %s from IP %s.", nmb_namestr(question), inet_ntoa(p->ip) ));
+    send_wins_name_release_response(0, p);
+    return;
+  }
+
+  /*
+   * See if the name already exists.
+   */
+    
+  namerec = find_name_on_subnet(subrec, question, FIND_ANY_NAME);
+
+  if( (namerec == NULL)
+   || ((namerec != NULL) && (namerec->data.source != REGISTER_NAME)) )
+  {
+    send_wins_name_release_response(NAM_ERR, p);
+    return;
+  }
+
+  /* 
+   * Check that the sending machine has permission to release this name.
+   * If it's a group name not ending in 0x1c then just say yes and let
+   * the group time out.
+   */
+
+  if(releasing_group_name && (question->name_type != 0x1c))
+  {
+    send_wins_name_release_response(0, p);
+    return;
+  }
+
+  /* 
+   * Check that the releasing node is on the list of IP addresses
+   * for this name. Disallow the release if not.
+   */
+
+  if(!find_ip_in_name_record(namerec, from_ip))
+  {
+    DEBUG(3,("wins_process_name_release_request: Refusing request to \
+release name %s as IP %s is not one of the known IP's for this name.\n",
+           nmb_namestr(question), inet_ntoa(from_ip) ));
+    send_wins_name_release_response(NAM_ERR, p);
+    return;
+  }    
+
+  /*
+   * Check if the record is active. IF it's already released
+   * or tombstoned, refuse the release.
+   */
+  if (!WINS_STATE_ACTIVE(namerec)) {
+    DEBUG(3,("wins_process_name_release_request: Refusing request to \
+release name %s as this record is not anymore active.\n",
+           nmb_namestr(question) ));
+    send_wins_name_release_response(NAM_ERR, p);
+    return;
+  }    
+
+  /*
+   * Check if the record is a 0x1c group
+   * and has more then one ip
+   * remove only this address.
+   */
+
+  if(releasing_group_name &&
+		(question->name_type == 0x1c) &&
+		(namerec->data.num_ips > 1)) {
+	remove_ip_from_name_record(namerec, from_ip);
+	DEBUG(3,("wins_process_name_release_request: Remove IP %s from NAME: %s\n",
+			inet_ntoa(from_ip),nmb_namestr(question)));
+	send_wins_name_release_response(0, p);
+	return;
+  }
+
+  /* 
+   * Send a release response.
+   * Flag the name as released and update the ttl
+   */
+
+  send_wins_name_release_response(0, p);
+  
+  namerec->data.wins_flags |= WINS_RELEASED;
+  update_name_ttl(namerec, EXTINCTION_INTERVAL);
+
+  wins_hook("delete", namerec, 0);
+}
+
+/*******************************************************************
+ WINS time dependent processing.
+******************************************************************/
+
+void initiate_wins_processing(time_t t)
+{
+	static time_t lasttime = 0;
+	struct name_record *namerec;
+	struct name_record *next_namerec;
+	struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
+
+	if (!lasttime)
+		lasttime = t;
+	if (t - lasttime < 20)
+		return;
+
+	lasttime = t;
+
+	if(!lp_we_are_a_wins_server())
+		return;
+
+	for( namerec = (struct name_record *)ubi_trFirst( wins_server_subnet->namelist );
+	     namerec;
+	     namerec = next_namerec ) {
+		next_namerec = (struct name_record *)ubi_trNext( namerec );
+
+		if( (namerec->data.death_time != PERMANENT_TTL)
+		     && (namerec->data.death_time < t) ) {
+
+			if( namerec->data.source == SELF_NAME ) {
+				DEBUG( 3, ( "expire_names_on_subnet: Subnet %s not expiring SELF name %s\n", 
+				           wins_server_subnet->subnet_name, nmb_namestr(&namerec->name) ) );
+				namerec->data.death_time += 300;
+				namerec->subnet->namelist_changed = True;
+				continue;
+			}
+
+			/* handle records, samba is the wins owner */
+			if (ip_equal(namerec->data.wins_ip, our_fake_ip)) {
+				switch (namerec->data.wins_flags | WINS_STATE_MASK) {
+					case WINS_ACTIVE:
+						namerec->data.wins_flags&=~WINS_STATE_MASK;
+						namerec->data.wins_flags|=WINS_RELEASED;
+						namerec->data.death_time = t + EXTINCTION_INTERVAL;
+						DEBUG(3,("initiate_wins_processing: expiring %s\n", nmb_namestr(&namerec->name)));
+						break;
+					case WINS_RELEASED:
+						namerec->data.wins_flags&=~WINS_STATE_MASK;
+						namerec->data.wins_flags|=WINS_TOMBSTONED;
+						namerec->data.death_time = t + EXTINCTION_TIMEOUT;
+						get_global_id_and_update(&namerec->data.id, True);
+						DEBUG(3,("initiate_wins_processing: tombstoning %s\n", nmb_namestr(&namerec->name)));
+						break;
+					case WINS_TOMBSTONED:
+						DEBUG(3,("initiate_wins_processing: deleting %s\n", nmb_namestr(&namerec->name)));
+						remove_name_from_namelist( wins_server_subnet, namerec );
+						break;
+				}
+			} else {
+				switch (namerec->data.wins_flags | WINS_STATE_MASK) {
+					case WINS_ACTIVE:
+						/* that's not as MS says it should be */
+						namerec->data.wins_flags&=~WINS_STATE_MASK;
+						namerec->data.wins_flags|=WINS_TOMBSTONED;
+						namerec->data.death_time = t + EXTINCTION_TIMEOUT;
+						DEBUG(3,("initiate_wins_processing: tombstoning %s\n", nmb_namestr(&namerec->name)));
+					case WINS_TOMBSTONED:
+						DEBUG(3,("initiate_wins_processing: deleting %s\n", nmb_namestr(&namerec->name)));
+						remove_name_from_namelist( wins_server_subnet, namerec );
+						break;
+					case WINS_RELEASED:
+						DEBUG(0,("initiate_wins_processing: %s is in released state and\
+we are not the wins owner !\n", nmb_namestr(&namerec->name)));
+						break;
+				}
+			}
+
+		}
+	}
+
+	if(wins_server_subnet->namelist_changed)
+		wins_write_database(True);
+
+	wins_server_subnet->namelist_changed = False;
+}
+
+/*******************************************************************
+ Write out the current WINS database.
+******************************************************************/
+void wins_write_database(BOOL background)
+{
+	struct name_record *namerec;
+	pstring fname, fnamenew;
+	TDB_CONTEXT *tdb;
+	TDB_DATA kbuf, dbuf;
+	pstring key, buf;
+	int len;
+	int num_record=0;
+	SMB_BIG_UINT id;
+
+	if(!lp_we_are_a_wins_server())
+		return;
+
+	/* we will do the writing in a child process to ensure that the parent
+	  doesn't block while this is done */
+	if (background) {
+		CatchChild();
+		if (sys_fork()) {
+			return;
+		}
+	}
+
+	slprintf(fname,sizeof(fname)-1,"%s/%s", lp_lockdir(), WINS_LIST);
+	all_string_sub(fname,"//", "/", 0);
+	slprintf(fnamenew,sizeof(fnamenew)-1,"%s.%u", fname, (unsigned int)sys_getpid());
+
+	tdb = tdb_open_log(fnamenew, 0, TDB_DEFAULT, O_RDWR|O_CREAT|O_TRUNC, 0644);
+	if (!tdb) {
+		DEBUG(0,("wins_write_database: Can't open %s. Error was %s\n", fnamenew, strerror(errno)));
+		if (background)
+			_exit(0);
+		return;
+	}
+
+	DEBUG(3,("wins_write_database: Dump of WINS name list.\n"));
+
+	tdb_store_int32(tdb, INFO_VERSION, WINS_VERSION);
+
+	for (namerec = (struct name_record *)ubi_trFirst( wins_server_subnet->namelist );
+	     namerec;
+	     namerec = (struct name_record *)ubi_trNext( namerec ) ) {
+
+		int i;
+		struct tm *tm;
+
+		DEBUGADD(3,("%-19s ", nmb_namestr(&namerec->name) ));
+
+		if( namerec->data.death_time != PERMANENT_TTL ) {
+			char *ts, *nl;
+
+			tm = LocalTime(&namerec->data.death_time);
+			ts = asctime(tm);
+			nl = strrchr_m( ts, '\n' );
+			if( NULL != nl )
+				*nl = '\0';
+
+			DEBUGADD(3,("TTL = %s  ", ts ));
+		} else
+			DEBUGADD(3,("TTL = PERMANENT                 "));
+
+		for (i = 0; i < namerec->data.num_ips; i++)
+			DEBUGADD(0,("%15s ", inet_ntoa(namerec->data.ip[i]) ));
+
+		DEBUGADD(3,("0x%2x 0x%2x %15s\n", namerec->data.nb_flags, namerec->data.wins_flags, inet_ntoa(namerec->data.wins_ip)));
+
+		if( namerec->data.source == REGISTER_NAME ) {
+		
+			/* store the type in the key to make the name unique */
+			slprintf(key, sizeof(key), "%s%s#%02x", ENTRY_PREFIX, namerec->name.name, namerec->name.name_type);
+
+			len = tdb_pack(buf, sizeof(buf), "dddfddd",
+					(int)namerec->data.nb_flags,
+					(int)(namerec->data.id>>32),
+					(int)(namerec->data.id&0xffffffff),
+					inet_ntoa(namerec->data.wins_ip),
+					(int)namerec->data.death_time, 
+					namerec->data.num_ips,
+					namerec->data.wins_flags);
+
+			for (i = 0; i < namerec->data.num_ips; i++)
+				len += tdb_pack(buf+len, sizeof(buf)-len, "f", inet_ntoa(namerec->data.ip[i]));
+			
+			kbuf.dsize = strlen(key)+1;
+			kbuf.dptr = key;
+			dbuf.dsize = len;
+			dbuf.dptr = buf;
+			if (tdb_store(tdb, kbuf, dbuf, TDB_INSERT) != 0) return;
+
+			num_record++;
+		}
+	}
+
+	/* store the number of records */
+	tdb_store_int32(tdb, INFO_COUNT, num_record);
+
+	/* get and store the last used ID */
+	get_global_id_and_update(&id, False);
+	tdb_store_int32(tdb, INFO_ID_HIGH, id>>32);
+	tdb_store_int32(tdb, INFO_ID_LOW, id&0xffffffff);
+
+	tdb_close(tdb);
+
+	chmod(fnamenew,0644);
+	unlink(fname);
+	rename(fnamenew,fname);
+
+	if (background)
+		_exit(0);
+}
+
+/****************************************************************************
+process a internal Samba message receiving a wins record
+***************************************************************************/
+void nmbd_wins_new_entry(int msg_type, pid_t src, void *buf, size_t len)
+{
+	WINS_RECORD *record;
+	struct name_record *namerec = NULL;
+	struct name_record *new_namerec = NULL;
+	struct nmb_name question;
+	BOOL overwrite=False;
+	struct in_addr our_fake_ip = *interpret_addr2("0.0.0.0");
+	int i;
+
+	if (buf==NULL)
+		return;
+	
+	record=(WINS_RECORD *)buf;
+	
+	ZERO_STRUCT(question);
+	memcpy(question.name, record->name, 16);
+	question.name_type=record->type;
+
+	namerec = find_name_on_subnet(wins_server_subnet, &question, FIND_ANY_NAME);
+
+	/* record doesn't exist, add it */
+	if (namerec == NULL) {
+		DEBUG(3,("nmbd_wins_new_entry: adding new replicated record: %s<%02x> for wins server: %s\n", 
+			  record->name, record->type, inet_ntoa(record->wins_ip)));
+
+		new_namerec=add_name_to_subnet( wins_server_subnet, record->name, record->type, record->nb_flags, 
+						EXTINCTION_INTERVAL, REGISTER_NAME, record->num_ips, record->ip);
+		if (new_namerec!=NULL) {
+				update_wins_owner(new_namerec, record->wins_ip);
+				update_wins_flag(new_namerec, record->wins_flags);
+				new_namerec->data.id=record->id;
+
+				wins_server_subnet->namelist_changed = True;
+			}
+	}
+
+	/* check if we have a conflict */
+	if (namerec != NULL) {
+		/* both records are UNIQUE */
+		if (namerec->data.wins_flags&WINS_UNIQUE && record->wins_flags&WINS_UNIQUE) {
+
+			/* the database record is a replica */
+			if (!ip_equal(namerec->data.wins_ip, our_fake_ip)) {
+				if (namerec->data.wins_flags&WINS_ACTIVE && record->wins_flags&WINS_TOMBSTONED) {
+					if (ip_equal(namerec->data.wins_ip, record->wins_ip))
+						overwrite=True;
+				} else
+					overwrite=True;
+			} else {
+			/* we are the wins owner of the database record */
+				/* the 2 records have the same IP address */
+				if (ip_equal(namerec->data.ip[0], record->ip[0])) {
+					if (namerec->data.wins_flags&WINS_ACTIVE && record->wins_flags&WINS_TOMBSTONED)
+						get_global_id_and_update(&namerec->data.id, True);
+					else
+						overwrite=True;
+				
+				} else {
+				/* the 2 records have different IP address */
+					if (namerec->data.wins_flags&WINS_ACTIVE) {
+						if (record->wins_flags&WINS_TOMBSTONED)
+							get_global_id_and_update(&namerec->data.id, True);
+						if (record->wins_flags&WINS_ACTIVE)
+							/* send conflict challenge to the replica node */
+							;
+					} else
+						overwrite=True;
+				}
+
+			}
+		}
+		
+		/* the replica is a standard group */
+		if (record->wins_flags&WINS_NGROUP || record->wins_flags&WINS_SGROUP) {
+			/* if the database record is unique and active force a name release */
+			if (namerec->data.wins_flags&WINS_UNIQUE)
+				/* send a release name to the unique node */
+				;
+			overwrite=True;
+		
+		}
+	
+		/* the replica is a special group */
+		if (record->wins_flags&WINS_SGROUP && namerec->data.wins_flags&WINS_SGROUP) {
+			if (namerec->data.wins_flags&WINS_ACTIVE) {
+				for (i=0; i<record->num_ips; i++)
+					if(!find_ip_in_name_record(namerec, record->ip[i]))
+						add_ip_to_name_record(namerec, record->ip[i]);
+			}
+			else
+				overwrite=True;
+		}
+		
+		/* the replica is a multihomed host */
+		
+		/* I'm giving up on multi homed. Too much complex to understand */
+		
+		if (record->wins_flags&WINS_MHOMED) {
+			if (! (namerec->data.wins_flags&WINS_ACTIVE)) {
+				if ( !(namerec->data.wins_flags&WINS_RELEASED) && !(namerec->data.wins_flags&WINS_NGROUP))
+					overwrite=True;
+			}
+			else {
+				if (ip_equal(record->wins_ip, namerec->data.wins_ip))
+					overwrite=True;
+				
+				if (ip_equal(namerec->data.wins_ip, our_fake_ip))
+					if (namerec->data.wins_flags&WINS_UNIQUE)
+						get_global_id_and_update(&namerec->data.id, True);
+				
+			}
+			
+			if (record->wins_flags&WINS_ACTIVE && namerec->data.wins_flags&WINS_ACTIVE)
+				if (namerec->data.wins_flags&WINS_UNIQUE ||
+				    namerec->data.wins_flags&WINS_MHOMED)
+					if (ip_equal(record->wins_ip, namerec->data.wins_ip))
+						overwrite=True;
+				
+		}
+
+		if (overwrite == False)
+			DEBUG(3, ("nmbd_wins_new_entry: conflict in adding record: %s<%02x> from wins server: %s\n", 
+				  record->name, record->type, inet_ntoa(record->wins_ip)));
+		else {
+			DEBUG(3, ("nmbd_wins_new_entry: replacing record: %s<%02x> from wins server: %s\n", 
+				  record->name, record->type, inet_ntoa(record->wins_ip)));
+
+			/* remove the old record and add a new one */
+			remove_name_from_namelist( wins_server_subnet, namerec );
+			new_namerec=add_name_to_subnet( wins_server_subnet, record->name, record->type, record->nb_flags, 
+						EXTINCTION_INTERVAL, REGISTER_NAME, record->num_ips, record->ip);
+			if (new_namerec!=NULL) {
+				update_wins_owner(new_namerec, record->wins_ip);
+				update_wins_flag(new_namerec, record->wins_flags);
+				new_namerec->data.id=record->id;
+
+				wins_server_subnet->namelist_changed = True;
+			}
+
+			wins_server_subnet->namelist_changed = True;
+		}
+
+	}
+}
+
+
+
+
+
+
+
+