1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/*
Unix SMB/CIFS implementation.
NBT netbios routines and daemon - version 2
Copyright (C) Jeremy Allison 1994-1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/****************************************************************************
Function called when the name lookup succeeded.
****************************************************************************/
static void wins_proxy_name_query_request_success( struct subnet_record *subrec,
struct userdata_struct *userdata,
struct nmb_name *nmbname, struct in_addr ip, struct res_rec *rrec)
{
struct packet_struct *original_packet;
struct subnet_record *orig_broadcast_subnet;
struct name_record *namerec;
uint16 nb_flags;
int num_ips;
int i;
int ttl = 3600; /* By default one hour in the cache. */
struct in_addr *iplist;
/* Extract the original packet and the original broadcast subnet from
the userdata. */
memcpy( (char *)&orig_broadcast_subnet, userdata->data, sizeof(struct subnet_record *) );
memcpy( (char *)&original_packet, &userdata->data[sizeof(struct subnet_record *)],
sizeof(struct packet_struct *) );
nb_flags = get_nb_flags( rrec->rdata );
num_ips = rrec->rdlength / 6;
if(num_ips == 0)
{
DEBUG(0,("wins_proxy_name_query_request_success: Invalid number of IP records (0) \
returned for name %s.\n", nmb_namestr(nmbname) ));
return;
}
if(num_ips == 1)
iplist = &ip;
else
{
if((iplist = (struct in_addr *)malloc( num_ips * sizeof(struct in_addr) )) == NULL)
{
DEBUG(0,("wins_proxy_name_query_request_success: malloc fail !\n"));
return;
}
for(i = 0; i < num_ips; i++)
putip( (char *)&iplist[i], (char *)&rrec->rdata[ (i*6) + 2]);
}
/* Add the queried name to the original subnet as a WINS_PROXY_NAME. */
if(rrec == PERMANENT_TTL)
ttl = lp_max_ttl();
namerec = add_name_to_subnet( orig_broadcast_subnet, nmbname->name,
nmbname->name_type, nb_flags, ttl,
WINS_PROXY_NAME, num_ips, iplist );
if(iplist != &ip)
SAFE_FREE(iplist);
/*
* Check that none of the IP addresses we are returning is on the
* same broadcast subnet as the original requesting packet. If it
* is then don't reply (although we still need to add the name
* to the cache) as the actual machine will be replying also
* and we don't want two replies to a broadcast query.
*/
if(namerec && original_packet->packet.nmb.header.nm_flags.bcast)
{
for( i = 0; i < namerec->data.num_ips; i++)
{
if( same_net( namerec->data.ip[i],
orig_broadcast_subnet->myip,
orig_broadcast_subnet->mask_ip ) )
{
DEBUG( 5, ( "wins_proxy_name_query_request_success: name %s is a WINS \
proxy name and is also on the same subnet (%s) as the requestor. \
Not replying.\n",
nmb_namestr(&namerec->name),
orig_broadcast_subnet->subnet_name ) );
return;
}
}
}
/* Finally reply to the original name query. */
reply_netbios_packet(original_packet, /* Packet to reply to. */
0, /* Result code. */
NMB_QUERY, /* nmbd type code. */
NMB_NAME_QUERY_OPCODE, /* opcode. */
ttl, /* ttl. */
rrec->rdata, /* data to send. */
rrec->rdlength); /* data length. */
}
/****************************************************************************
Function called when the name lookup failed.
****************************************************************************/
static void wins_proxy_name_query_request_fail(struct subnet_record *subrec,
struct response_record *rrec,
struct nmb_name *question_name, int fail_code)
{
DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \
of name %s.\n", fail_code, nmb_namestr(question_name) ));
}
/****************************************************************************
Function to make a deep copy of the userdata we will need when the WINS
proxy query returns.
****************************************************************************/
static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata)
{
struct packet_struct *p, *copy_of_p;
struct userdata_struct *new_userdata =
(struct userdata_struct *)malloc( userdata->userdata_len );
if(new_userdata == NULL)
return NULL;
new_userdata->copy_fn = userdata->copy_fn;
new_userdata->free_fn = userdata->free_fn;
new_userdata->userdata_len = userdata->userdata_len;
/* Copy the subnet_record pointer. */
memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) );
/* Extract the pointer to the packet struct */
memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
sizeof(struct packet_struct *) );
/* Do a deep copy of the packet. */
if((copy_of_p = copy_packet(p)) == NULL)
{
SAFE_FREE(new_userdata);
return NULL;
}
/* Lock the copy. */
copy_of_p->locked = True;
memcpy( &new_userdata->data[sizeof(struct subnet_record *)], (char *)©_of_p,
sizeof(struct packet_struct *) );
return new_userdata;
}
/****************************************************************************
Function to free the deep copy of the userdata we used when the WINS
proxy query returned.
****************************************************************************/
static void wins_proxy_userdata_free_fn(struct userdata_struct *userdata)
{
struct packet_struct *p;
/* Extract the pointer to the packet struct */
memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
sizeof(struct packet_struct *));
/* Unlock the packet. */
p->locked = False;
free_packet(p);
ZERO_STRUCTP(userdata);
SAFE_FREE(userdata);
}
/****************************************************************************
Make a WINS query on behalf of a broadcast client name query request.
****************************************************************************/
void make_wins_proxy_name_query_request( struct subnet_record *subrec,
struct packet_struct *incoming_packet,
struct nmb_name *question_name)
{
long *ud[(sizeof(struct userdata_struct) + sizeof(struct subrec *) +
sizeof(struct packet_struct *))/sizeof(long *) + 1];
struct userdata_struct *userdata = (struct userdata_struct *)ud;
memset(ud, '\0', sizeof(ud));
userdata->copy_fn = wins_proxy_userdata_copy_fn;
userdata->free_fn = wins_proxy_userdata_free_fn;
userdata->userdata_len = sizeof(ud);
memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *));
memcpy( &userdata->data[sizeof(struct subnet_record *)], (char *)&incoming_packet,
sizeof(struct packet_struct *));
/* Now use the unicast subnet to query the name with the WINS server. */
query_name( unicast_subnet, question_name->name, question_name->name_type,
wins_proxy_name_query_request_success,
wins_proxy_name_query_request_fail,
userdata);
}
|
