2 Unix SMB/CIFS implementation.
3 NBT netbios routines and daemon - version 2
5 Copyright (C) Jeremy Allison 1994-1998
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 /****************************************************************************
26 Function called when the name lookup succeeded.
27 ****************************************************************************/
29 static void wins_proxy_name_query_request_success( struct subnet_record *subrec,
30 struct userdata_struct *userdata,
31 struct nmb_name *nmbname, struct in_addr ip, struct res_rec *rrec)
34 struct packet_struct *original_packet;
35 struct subnet_record *orig_broadcast_subnet;
36 struct name_record *namerec = NULL;
40 int ttl = 3600; /* By default one hour in the cache. */
41 struct in_addr *iplist;
43 /* Extract the original packet and the original broadcast subnet from
46 memcpy( (char *)&orig_broadcast_subnet, userdata->data, sizeof(struct subnet_record *) );
47 memcpy( (char *)&original_packet, &userdata->data[sizeof(struct subnet_record *)],
48 sizeof(struct packet_struct *) );
50 nb_flags = get_nb_flags( rrec->rdata );
52 num_ips = rrec->rdlength / 6;
54 DEBUG(0,("wins_proxy_name_query_request_success: Invalid number of IP records (0) \
55 returned for name %s.\n", nmb_namestr(nmbname) ));
62 if((iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips )) == NULL) {
63 DEBUG(0,("wins_proxy_name_query_request_success: malloc fail !\n"));
67 for(i = 0; i < num_ips; i++) {
68 putip( (char *)&iplist[i], (char *)&rrec->rdata[ (i*6) + 2]);
72 /* Add the queried name to the original subnet as a WINS_PROXY_NAME. */
74 if(rrec == PERMANENT_TTL) {
78 pull_ascii_nstring(name, sizeof(name), nmbname->name);
79 add_name_to_subnet( orig_broadcast_subnet, name,
80 nmbname->name_type, nb_flags, ttl,
81 WINS_PROXY_NAME, num_ips, iplist );
83 namerec = find_name_on_subnet(orig_broadcast_subnet, nmbname, FIND_ANY_NAME);
85 DEBUG(0,("wins_proxy_name_query_request_success: failed to add "
86 "name %s to subnet %s !\n",
88 orig_broadcast_subnet->subnet_name ));
97 * Check that none of the IP addresses we are returning is on the
98 * same broadcast subnet as the original requesting packet. If it
99 * is then don't reply (although we still need to add the name
100 * to the cache) as the actual machine will be replying also
101 * and we don't want two replies to a broadcast query.
104 if(namerec && original_packet->packet.nmb.header.nm_flags.bcast) {
105 for( i = 0; i < namerec->data.num_ips; i++) {
106 if( same_net( namerec->data.ip[i], orig_broadcast_subnet->myip,
107 orig_broadcast_subnet->mask_ip ) ) {
108 DEBUG( 5, ( "wins_proxy_name_query_request_success: name %s is a WINS \
109 proxy name and is also on the same subnet (%s) as the requestor. \
110 Not replying.\n", nmb_namestr(&namerec->name), orig_broadcast_subnet->subnet_name ) );
116 /* Finally reply to the original name query. */
117 reply_netbios_packet(original_packet, /* Packet to reply to. */
118 0, /* Result code. */
119 NMB_QUERY, /* nmbd type code. */
120 NMB_NAME_QUERY_OPCODE, /* opcode. */
122 rrec->rdata, /* data to send. */
123 rrec->rdlength); /* data length. */
126 /****************************************************************************
127 Function called when the name lookup failed.
128 ****************************************************************************/
130 static void wins_proxy_name_query_request_fail(struct subnet_record *subrec,
131 struct response_record *rrec,
132 struct nmb_name *question_name, int fail_code)
134 DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \
135 of name %s.\n", fail_code, nmb_namestr(question_name) ));
138 /****************************************************************************
139 Function to make a deep copy of the userdata we will need when the WINS
141 ****************************************************************************/
143 static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata)
145 struct packet_struct *p, *copy_of_p;
146 struct userdata_struct *new_userdata = (struct userdata_struct *)SMB_MALLOC( userdata->userdata_len );
148 if(new_userdata == NULL)
151 new_userdata->copy_fn = userdata->copy_fn;
152 new_userdata->free_fn = userdata->free_fn;
153 new_userdata->userdata_len = userdata->userdata_len;
155 /* Copy the subnet_record pointer. */
156 memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) );
158 /* Extract the pointer to the packet struct */
159 memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)], sizeof(struct packet_struct *) );
161 /* Do a deep copy of the packet. */
162 if((copy_of_p = copy_packet(p)) == NULL) {
163 SAFE_FREE(new_userdata);
168 copy_of_p->locked = True;
170 memcpy( &new_userdata->data[sizeof(struct subnet_record *)], (char *)©_of_p,
171 sizeof(struct packet_struct *) );
176 /****************************************************************************
177 Function to free the deep copy of the userdata we used when the WINS
178 proxy query returned.
179 ****************************************************************************/
181 static void wins_proxy_userdata_free_fn(struct userdata_struct *userdata)
183 struct packet_struct *p;
185 /* Extract the pointer to the packet struct */
186 memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
187 sizeof(struct packet_struct *));
189 /* Unlock the packet. */
193 ZERO_STRUCTP(userdata);
197 /****************************************************************************
198 Make a WINS query on behalf of a broadcast client name query request.
199 ****************************************************************************/
201 void make_wins_proxy_name_query_request( struct subnet_record *subrec,
202 struct packet_struct *incoming_packet,
203 struct nmb_name *question_name)
206 struct userdata_struct ud;
207 char c[sizeof(struct userdata_struct) + sizeof(struct subrec *) +
208 sizeof(struct packet_struct *)+sizeof(long*)];
210 struct userdata_struct *userdata = &ud.ud;
213 memset(&ud, '\0', sizeof(ud));
215 userdata->copy_fn = wins_proxy_userdata_copy_fn;
216 userdata->free_fn = wins_proxy_userdata_free_fn;
217 userdata->userdata_len = sizeof(ud);
218 memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *));
219 memcpy( &userdata->data[sizeof(struct subnet_record *)], (char *)&incoming_packet,
220 sizeof(struct packet_struct *));
222 /* Now use the unicast subnet to query the name with the WINS server. */
223 pull_ascii_nstring(qname, sizeof(qname), question_name->name);
224 query_name( unicast_subnet, qname, question_name->name_type,
225 wins_proxy_name_query_request_success,
226 wins_proxy_name_query_request_fail,