2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
6 Copyright (C) Jeremy Allison 1994-1998
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 extern int DEBUGLEVEL;
28 /****************************************************************************
29 Function called when the name lookup succeeded.
30 ****************************************************************************/
32 static void wins_proxy_name_query_request_success( struct subnet_record *subrec,
33 struct userdata_struct *userdata,
34 struct nmb_name *nmbname, struct in_addr ip, struct res_rec *rrec)
36 struct packet_struct *original_packet;
37 struct subnet_record *orig_broadcast_subnet;
38 struct name_record *namerec;
42 int ttl = 3600; /* By default one hour in the cache. */
43 struct in_addr *iplist;
45 /* Extract the original packet and the original broadcast subnet from
48 memcpy( (char *)&orig_broadcast_subnet, userdata->data, sizeof(struct subnet_record *) );
49 memcpy( (char *)&original_packet, &userdata->data[sizeof(struct subnet_record *)],
50 sizeof(struct packet_struct *) );
52 nb_flags = get_nb_flags( rrec->rdata );
54 num_ips = rrec->rdlength / 6;
57 DEBUG(0,("wins_proxy_name_query_request_success: Invalid number of IP records (0) \
58 returned for name %s.\n", namestr(nmbname) ));
66 if((iplist = (struct in_addr *)malloc( num_ips * sizeof(struct in_addr) )) == NULL)
68 DEBUG(0,("wins_proxy_name_query_request_success: malloc fail !\n"));
72 for(i = 0; i < num_ips; i++)
73 putip( (char *)&iplist[i], (char *)&rrec->rdata[ (i*6) + 2]);
76 /* Add the queried name to the original subnet as a WINS_PROXY_NAME. */
78 if(rrec == PERMANENT_TTL)
81 namerec = add_name_to_subnet( orig_broadcast_subnet, nmbname->name, nmbname->name_type,
82 nb_flags, ttl, WINS_PROXY_NAME, num_ips, iplist);
88 * Check that none of the IP addresses we are returning is on the
89 * same broadcast subnet as the original requesting packet. If it
90 * is then don't reply (although we still need to add the name
91 * to the cache) as the actual machine will be replying also
92 * and we don't want two replies to a broadcast query.
95 if(namerec && original_packet->packet.nmb.header.nm_flags.bcast)
97 for( i = 0; i < namerec->data.num_ips; i++)
99 if( same_net( namerec->data.ip[i],
100 orig_broadcast_subnet->myip,
101 orig_broadcast_subnet->mask_ip ) )
103 DEBUG( 5, ( "wins_proxy_name_query_request_success: name %s is a WINS \
104 proxy name and is also on the same subnet (%s) as the requestor. \
106 namestr(&namerec->name),
107 orig_broadcast_subnet->subnet_name ) );
113 /* Finally reply to the original name query. */
114 reply_netbios_packet(original_packet, /* Packet to reply to. */
115 0, /* Result code. */
116 NMB_QUERY, /* nmbd type code. */
117 NMB_NAME_QUERY_OPCODE, /* opcode. */
119 rrec->rdata, /* data to send. */
120 rrec->rdlength); /* data length. */
123 /****************************************************************************
124 Function called when the name lookup failed.
125 ****************************************************************************/
127 static void wins_proxy_name_query_request_fail(struct subnet_record *subrec,
128 struct response_record *rrec,
129 struct nmb_name *question_name, int fail_code)
131 DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \
132 of name %s.\n", fail_code, namestr(question_name) ));
135 /****************************************************************************
136 Function to make a deep copy of the userdata we will need when the WINS
138 ****************************************************************************/
140 static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata)
142 struct packet_struct *p, *copy_of_p;
143 struct userdata_struct *new_userdata =
144 (struct userdata_struct *)malloc( userdata->userdata_len );
146 if(new_userdata == NULL)
149 new_userdata->copy_fn = userdata->copy_fn;
150 new_userdata->free_fn = userdata->free_fn;
151 new_userdata->userdata_len = userdata->userdata_len;
153 /* Copy the subnet_record pointer. */
154 memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) );
156 /* Extract the pointer to the packet struct */
157 memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
158 sizeof(struct packet_struct *) );
160 /* Do a deep copy of the packet. */
161 if((copy_of_p = copy_packet(p)) == NULL)
163 free((char *)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 free((char *)userdata);
196 /****************************************************************************
197 Make a WINS query on behalf of a broadcast client name query request.
198 ****************************************************************************/
200 void make_wins_proxy_name_query_request( struct subnet_record *subrec,
201 struct packet_struct *incoming_packet,
202 struct nmb_name *question_name)
204 char ud[sizeof(struct userdata_struct) + sizeof(struct subrec *) +
205 sizeof(struct packet_struct *)];
206 struct userdata_struct *userdata = (struct userdata_struct *)ud;
208 bzero(ud, sizeof(ud));
210 userdata->copy_fn = wins_proxy_userdata_copy_fn;
211 userdata->free_fn = wins_proxy_userdata_free_fn;
212 userdata->userdata_len = sizeof(ud);
213 memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *));
214 memcpy( &userdata->data[sizeof(struct subnet_record *)], (char *)&incoming_packet,
215 sizeof(struct packet_struct *));
217 /* Now use the unicast subnet to query the name with the WINS server. */
218 query_name( unicast_subnet, question_name->name, question_name->name_type,
219 wins_proxy_name_query_request_success,
220 wins_proxy_name_query_request_fail,