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->num_ips; i++)
99 if(same_net( namerec->ip[i], orig_broadcast_subnet->myip, orig_broadcast_subnet->mask_ip ))
101 DEBUG(5,("wins_proxy_name_query_request_success: name %s is a WINS proxy name and is also \
102 on the same subnet (%s) as the requestor. Not replying.\n",
103 namestr(&namerec->name), orig_broadcast_subnet->subnet_name ));
109 /* Finally reply to the original name query. */
110 reply_netbios_packet(original_packet, /* Packet to reply to. */
111 0, /* Result code. */
112 NMB_QUERY, /* nmbd type code. */
113 NMB_NAME_QUERY_OPCODE, /* opcode. */
115 rrec->rdata, /* data to send. */
116 rrec->rdlength); /* data length. */
119 /****************************************************************************
120 Function called when the name lookup failed.
121 ****************************************************************************/
123 static void wins_proxy_name_query_request_fail(struct subnet_record *subrec,
124 struct response_record *rrec,
125 struct nmb_name *question_name, int fail_code)
127 DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \
128 of name %s.\n", fail_code, namestr(question_name) ));
131 /****************************************************************************
132 Function to make a deep copy of the userdata we will need when the WINS
134 ****************************************************************************/
136 static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata)
138 struct packet_struct *p, *copy_of_p;
139 struct userdata_struct *new_userdata =
140 (struct userdata_struct *)malloc( userdata->userdata_len );
142 if(new_userdata == NULL)
145 new_userdata->copy_fn = userdata->copy_fn;
146 new_userdata->free_fn = userdata->free_fn;
147 new_userdata->userdata_len = userdata->userdata_len;
149 /* Copy the subnet_record pointer. */
150 memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) );
152 /* Extract the pointer to the packet struct */
153 memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
154 sizeof(struct packet_struct *) );
156 /* Do a deep copy of the packet. */
157 if((copy_of_p = copy_packet(p)) == NULL)
159 free((char *)new_userdata);
164 copy_of_p->locked = True;
166 memcpy( &new_userdata->data[sizeof(struct subnet_record *)], (char *)©_of_p,
167 sizeof(struct packet_struct *) );
172 /****************************************************************************
173 Function to free the deep copy of the userdata we used when the WINS
174 proxy query returned.
175 ****************************************************************************/
177 static void wins_proxy_userdata_free_fn(struct userdata_struct *userdata)
179 struct packet_struct *p;
181 /* Extract the pointer to the packet struct */
182 memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
183 sizeof(struct packet_struct *));
185 /* Unlock the packet. */
189 free((char *)userdata);
192 /****************************************************************************
193 Make a WINS query on behalf of a broadcast client name query request.
194 ****************************************************************************/
196 void make_wins_proxy_name_query_request( struct subnet_record *subrec,
197 struct packet_struct *incoming_packet,
198 struct nmb_name *question_name)
200 char ud[sizeof(struct userdata_struct) + sizeof(struct subrec *) +
201 sizeof(struct packet_struct *)];
202 struct userdata_struct *userdata = (struct userdata_struct *)ud;
204 bzero(ud, sizeof(ud));
206 userdata->copy_fn = wins_proxy_userdata_copy_fn;
207 userdata->free_fn = wins_proxy_userdata_free_fn;
208 userdata->userdata_len = sizeof(ud);
209 memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *));
210 memcpy( &userdata->data[sizeof(struct subnet_record *)], (char *)&incoming_packet,
211 sizeof(struct packet_struct *));
213 /* Now use the unicast subnet to query the name with the WINS server. */
214 query_name( unicast_subnet, question_name->name, question_name->name_type,
215 wins_proxy_name_query_request_success,
216 wins_proxy_name_query_request_fail,