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Unix SMB/CIFS implementation.
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NBT netbios routines and daemon - version 2
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Copyright (C) Jeremy Allison 1994-1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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/****************************************************************************
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Function called when the name lookup succeeded.
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****************************************************************************/
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static void wins_proxy_name_query_request_success( struct subnet_record *subrec,
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struct userdata_struct *userdata,
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struct nmb_name *nmbname, struct in_addr ip, struct res_rec *rrec)
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struct packet_struct *original_packet;
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struct subnet_record *orig_broadcast_subnet;
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struct name_record *namerec = NULL;
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int ttl = 3600; /* By default one hour in the cache. */
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struct in_addr *iplist;
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/* Extract the original packet and the original broadcast subnet from
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memcpy( (char *)&orig_broadcast_subnet, userdata->data, sizeof(struct subnet_record *) );
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memcpy( (char *)&original_packet, &userdata->data[sizeof(struct subnet_record *)],
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sizeof(struct packet_struct *) );
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nb_flags = get_nb_flags( rrec->rdata );
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num_ips = rrec->rdlength / 6;
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DEBUG(0,("wins_proxy_name_query_request_success: Invalid number of IP records (0) \
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returned for name %s.\n", nmb_namestr(nmbname) ));
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if((iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips )) == NULL) {
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DEBUG(0,("wins_proxy_name_query_request_success: malloc fail !\n"));
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for(i = 0; i < num_ips; i++) {
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putip( (char *)&iplist[i], (char *)&rrec->rdata[ (i*6) + 2]);
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/* Add the queried name to the original subnet as a WINS_PROXY_NAME. */
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if(rrec->ttl == PERMANENT_TTL) {
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pull_ascii_nstring(name, sizeof(name), nmbname->name);
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add_name_to_subnet( orig_broadcast_subnet, name,
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nmbname->name_type, nb_flags, ttl,
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WINS_PROXY_NAME, num_ips, iplist );
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namerec = find_name_on_subnet(orig_broadcast_subnet, nmbname, FIND_ANY_NAME);
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DEBUG(0,("wins_proxy_name_query_request_success: failed to add "
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"name %s to subnet %s !\n",
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orig_broadcast_subnet->subnet_name ));
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* Check that none of the IP addresses we are returning is on the
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* same broadcast subnet as the original requesting packet. If it
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* is then don't reply (although we still need to add the name
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* to the cache) as the actual machine will be replying also
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* and we don't want two replies to a broadcast query.
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if(namerec && original_packet->packet.nmb.header.nm_flags.bcast) {
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for( i = 0; i < namerec->data.num_ips; i++) {
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if( same_net( namerec->data.ip[i], orig_broadcast_subnet->myip,
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orig_broadcast_subnet->mask_ip ) ) {
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DEBUG( 5, ( "wins_proxy_name_query_request_success: name %s is a WINS \
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proxy name and is also on the same subnet (%s) as the requestor. \
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Not replying.\n", nmb_namestr(&namerec->name), orig_broadcast_subnet->subnet_name ) );
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/* Finally reply to the original name query. */
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reply_netbios_packet(original_packet, /* Packet to reply to. */
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0, /* Result code. */
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NMB_QUERY, /* nmbd type code. */
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NMB_NAME_QUERY_OPCODE, /* opcode. */
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rrec->rdata, /* data to send. */
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rrec->rdlength); /* data length. */
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/****************************************************************************
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Function called when the name lookup failed.
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****************************************************************************/
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static void wins_proxy_name_query_request_fail(struct subnet_record *subrec,
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struct response_record *rrec,
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struct nmb_name *question_name, int fail_code)
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DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \
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of name %s.\n", fail_code, nmb_namestr(question_name) ));
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/****************************************************************************
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Function to make a deep copy of the userdata we will need when the WINS
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****************************************************************************/
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static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata)
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struct packet_struct *p, *copy_of_p;
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struct userdata_struct *new_userdata = (struct userdata_struct *)SMB_MALLOC( userdata->userdata_len );
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if(new_userdata == NULL)
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new_userdata->copy_fn = userdata->copy_fn;
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new_userdata->free_fn = userdata->free_fn;
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new_userdata->userdata_len = userdata->userdata_len;
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/* Copy the subnet_record pointer. */
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memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) );
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/* Extract the pointer to the packet struct */
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memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)], sizeof(struct packet_struct *) );
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/* Do a deep copy of the packet. */
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if((copy_of_p = copy_packet(p)) == NULL) {
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SAFE_FREE(new_userdata);
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copy_of_p->locked = True;
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memcpy( &new_userdata->data[sizeof(struct subnet_record *)], (char *)©_of_p,
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sizeof(struct packet_struct *) );
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/****************************************************************************
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Function to free the deep copy of the userdata we used when the WINS
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proxy query returned.
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****************************************************************************/
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static void wins_proxy_userdata_free_fn(struct userdata_struct *userdata)
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struct packet_struct *p;
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/* Extract the pointer to the packet struct */
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memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
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sizeof(struct packet_struct *));
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/* Unlock the packet. */
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ZERO_STRUCTP(userdata);
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/****************************************************************************
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Make a WINS query on behalf of a broadcast client name query request.
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****************************************************************************/
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void make_wins_proxy_name_query_request( struct subnet_record *subrec,
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struct packet_struct *incoming_packet,
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struct nmb_name *question_name)
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struct userdata_struct ud;
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char c[sizeof(struct userdata_struct) + sizeof(struct subrec *) +
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sizeof(struct packet_struct *)+sizeof(long*)];
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struct userdata_struct *userdata = &ud.ud;
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memset(&ud, '\0', sizeof(ud));
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userdata->copy_fn = wins_proxy_userdata_copy_fn;
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userdata->free_fn = wins_proxy_userdata_free_fn;
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userdata->userdata_len = sizeof(ud);
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memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *));
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memcpy( &userdata->data[sizeof(struct subnet_record *)], (char *)&incoming_packet,
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sizeof(struct packet_struct *));
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/* Now use the unicast subnet to query the name with the WINS server. */
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pull_ascii_nstring(qname, sizeof(qname), question_name->name);
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query_name( unicast_subnet, qname, question_name->name_type,
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wins_proxy_name_query_request_success,
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wins_proxy_name_query_request_fail,