Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 : NBT netbios routines and daemon - version 2
4 :
5 : Copyright (C) Jeremy Allison 1994-1998
6 :
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 3 of the License, or
10 : (at your option) any later version.
11 :
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.
16 :
17 : You should have received a copy of the GNU General Public License
18 : along with this program. If not, see <http://www.gnu.org/licenses/>.
19 :
20 : */
21 :
22 : #include "includes.h"
23 : #include "nmbd/nmbd.h"
24 :
25 : /****************************************************************************
26 : Function called when the name lookup succeeded.
27 : ****************************************************************************/
28 :
29 0 : 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)
32 : {
33 : unstring name;
34 : struct packet_struct *original_packet;
35 : struct subnet_record *orig_broadcast_subnet;
36 0 : struct name_record *namerec = NULL;
37 : uint16_t nb_flags;
38 : int num_ips;
39 : int i;
40 0 : int ttl = 3600; /* By default one hour in the cache. */
41 : struct in_addr *iplist;
42 :
43 : /* Extract the original packet and the original broadcast subnet from
44 : the userdata. */
45 :
46 0 : memcpy( (char *)&orig_broadcast_subnet, userdata->data, sizeof(struct subnet_record *) );
47 0 : memcpy( (char *)&original_packet, &userdata->data[sizeof(struct subnet_record *)],
48 : sizeof(struct packet_struct *) );
49 :
50 0 : if (rrec) {
51 0 : nb_flags = get_nb_flags( rrec->rdata );
52 0 : num_ips = rrec->rdlength / 6;
53 : } else {
54 0 : nb_flags = 0;
55 0 : num_ips = 0;
56 : }
57 :
58 0 : if(num_ips == 0) {
59 0 : DEBUG(0,("wins_proxy_name_query_request_success: Invalid number of IP records (0) \
60 : returned for name %s.\n", nmb_namestr(nmbname) ));
61 0 : return;
62 : }
63 :
64 0 : if(num_ips == 1) {
65 0 : iplist = &ip;
66 : } else {
67 0 : if((iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips )) == NULL) {
68 0 : DEBUG(0,("wins_proxy_name_query_request_success: malloc fail !\n"));
69 0 : return;
70 : }
71 :
72 0 : for(i = 0; i < num_ips; i++) {
73 0 : putip( (char *)&iplist[i], (char *)&rrec->rdata[ (i*6) + 2]);
74 : }
75 : }
76 :
77 : /* Add the queried name to the original subnet as a WINS_PROXY_NAME. */
78 :
79 0 : if(rrec->ttl == PERMANENT_TTL) {
80 0 : ttl = lp_max_ttl();
81 : }
82 :
83 0 : pull_ascii_nstring(name, sizeof(name), nmbname->name);
84 0 : add_name_to_subnet( orig_broadcast_subnet, name,
85 0 : nmbname->name_type, nb_flags, ttl,
86 : WINS_PROXY_NAME, num_ips, iplist );
87 :
88 0 : if(iplist != &ip) {
89 0 : SAFE_FREE(iplist);
90 : }
91 :
92 0 : namerec = find_name_on_subnet(orig_broadcast_subnet, nmbname, FIND_ANY_NAME);
93 0 : if (!namerec) {
94 0 : DEBUG(0,("wins_proxy_name_query_request_success: failed to add "
95 : "name %s to subnet %s !\n",
96 : name,
97 : orig_broadcast_subnet->subnet_name ));
98 0 : return;
99 : }
100 :
101 : /*
102 : * Check that none of the IP addresses we are returning is on the
103 : * same broadcast subnet as the original requesting packet. If it
104 : * is then don't reply (although we still need to add the name
105 : * to the cache) as the actual machine will be replying also
106 : * and we don't want two replies to a broadcast query.
107 : */
108 :
109 0 : if(namerec && original_packet->packet.nmb.header.nm_flags.bcast) {
110 0 : for( i = 0; i < namerec->data.num_ips; i++) {
111 0 : if( same_net_v4( namerec->data.ip[i], orig_broadcast_subnet->myip,
112 0 : orig_broadcast_subnet->mask_ip ) ) {
113 0 : DEBUG( 5, ( "wins_proxy_name_query_request_success: name %s is a WINS \
114 : proxy name and is also on the same subnet (%s) as the requester. \
115 : Not replying.\n", nmb_namestr(&namerec->name), orig_broadcast_subnet->subnet_name ) );
116 0 : return;
117 : }
118 : }
119 : }
120 :
121 : /* Finally reply to the original name query. */
122 0 : reply_netbios_packet(original_packet, /* Packet to reply to. */
123 : 0, /* Result code. */
124 : NMB_QUERY, /* nmbd type code. */
125 : NMB_NAME_QUERY_OPCODE, /* opcode. */
126 : ttl, /* ttl. */
127 0 : rrec->rdata, /* data to send. */
128 : rrec->rdlength); /* data length. */
129 : }
130 :
131 : /****************************************************************************
132 : Function called when the name lookup failed.
133 : ****************************************************************************/
134 :
135 0 : static void wins_proxy_name_query_request_fail(struct subnet_record *subrec,
136 : struct response_record *rrec,
137 : struct nmb_name *question_name, int fail_code)
138 : {
139 0 : DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \
140 : of name %s.\n", fail_code, nmb_namestr(question_name) ));
141 0 : }
142 :
143 : /****************************************************************************
144 : Function to make a deep copy of the userdata we will need when the WINS
145 : proxy query returns.
146 : ****************************************************************************/
147 :
148 0 : static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata)
149 : {
150 : struct packet_struct *p, *copy_of_p;
151 0 : struct userdata_struct *new_userdata = (struct userdata_struct *)SMB_MALLOC( userdata->userdata_len );
152 :
153 0 : if(new_userdata == NULL)
154 0 : return NULL;
155 :
156 0 : new_userdata->copy_fn = userdata->copy_fn;
157 0 : new_userdata->free_fn = userdata->free_fn;
158 0 : new_userdata->userdata_len = userdata->userdata_len;
159 :
160 : /* Copy the subnet_record pointer. */
161 0 : memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) );
162 :
163 : /* Extract the pointer to the packet struct */
164 0 : memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)], sizeof(struct packet_struct *) );
165 :
166 : /* Do a deep copy of the packet. */
167 0 : if((copy_of_p = copy_packet(p)) == NULL) {
168 0 : SAFE_FREE(new_userdata);
169 0 : return NULL;
170 : }
171 :
172 : /* Lock the copy. */
173 0 : copy_of_p->locked = True;
174 :
175 0 : memcpy( &new_userdata->data[sizeof(struct subnet_record *)], (char *)©_of_p,
176 : sizeof(struct packet_struct *) );
177 :
178 0 : return new_userdata;
179 : }
180 :
181 : /****************************************************************************
182 : Function to free the deep copy of the userdata we used when the WINS
183 : proxy query returned.
184 : ****************************************************************************/
185 :
186 0 : static void wins_proxy_userdata_free_fn(struct userdata_struct *userdata)
187 : {
188 : struct packet_struct *p;
189 :
190 : /* Extract the pointer to the packet struct */
191 0 : memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
192 : sizeof(struct packet_struct *));
193 :
194 : /* Unlock the packet. */
195 0 : p->locked = False;
196 :
197 0 : free_packet(p);
198 0 : ZERO_STRUCTP(userdata);
199 0 : SAFE_FREE(userdata);
200 0 : }
201 :
202 : /****************************************************************************
203 : Make a WINS query on behalf of a broadcast client name query request.
204 : ****************************************************************************/
205 :
206 0 : void make_wins_proxy_name_query_request( struct subnet_record *subrec,
207 : struct packet_struct *incoming_packet,
208 : struct nmb_name *question_name)
209 : {
210 : union {
211 : struct userdata_struct ud;
212 : char c[sizeof(struct userdata_struct) + sizeof(struct subrec *) +
213 : sizeof(struct packet_struct *)+sizeof(long*)];
214 : } ud;
215 0 : struct userdata_struct *userdata = &ud.ud;
216 : unstring qname;
217 :
218 0 : memset(&ud, '\0', sizeof(ud));
219 :
220 0 : userdata->copy_fn = wins_proxy_userdata_copy_fn;
221 0 : userdata->free_fn = wins_proxy_userdata_free_fn;
222 0 : userdata->userdata_len = sizeof(ud);
223 0 : memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *));
224 0 : memcpy( &userdata->data[sizeof(struct subnet_record *)], (char *)&incoming_packet,
225 : sizeof(struct packet_struct *));
226 :
227 : /* Now use the unicast subnet to query the name with the WINS server. */
228 0 : pull_ascii_nstring(qname, sizeof(qname), question_name->name);
229 0 : query_name( unicast_subnet, qname, question_name->name_type,
230 : wins_proxy_name_query_request_success,
231 : wins_proxy_name_query_request_fail,
232 : userdata);
233 0 : }
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