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 2 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, write to the Free Software
19   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20
21*/
22
23#include "includes.h"
24
25/****************************************************************************
26Function called when the name lookup succeeded.
27****************************************************************************/
28
29static 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	struct name_record *namerec = NULL;
37	uint16 nb_flags;
38	int num_ips;
39	int i;
40	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	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 *) );
49
50	if (rrec) {
51		nb_flags = get_nb_flags( rrec->rdata );
52		num_ips = rrec->rdlength / 6;
53	} else {
54		nb_flags = 0;
55		num_ips = 0;
56	}
57
58	if(num_ips == 0) {
59		DEBUG(0,("wins_proxy_name_query_request_success: Invalid number of IP records (0) \
60returned for name %s.\n", nmb_namestr(nmbname) ));
61		return;
62	}
63
64	if(num_ips == 1) {
65		iplist = &ip;
66	} else {
67		if((iplist = SMB_MALLOC_ARRAY( struct in_addr, num_ips )) == NULL) {
68			DEBUG(0,("wins_proxy_name_query_request_success: malloc fail !\n"));
69			return;
70		}
71
72		for(i = 0; i < num_ips; i++) {
73			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	if(rrec->ttl == PERMANENT_TTL) {
80		ttl = lp_max_ttl();
81	}
82
83	pull_ascii_nstring(name, sizeof(name), nmbname->name);
84	add_name_to_subnet( orig_broadcast_subnet, name,
85					nmbname->name_type, nb_flags, ttl,
86					WINS_PROXY_NAME, num_ips, iplist );
87
88	if(iplist != &ip) {
89		SAFE_FREE(iplist);
90	}
91
92	namerec = find_name_on_subnet(orig_broadcast_subnet, nmbname, FIND_ANY_NAME);
93	if (!namerec) {
94		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		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	if(namerec && original_packet->packet.nmb.header.nm_flags.bcast) {
110		for( i = 0; i < namerec->data.num_ips; i++) {
111			if( same_net( namerec->data.ip[i], orig_broadcast_subnet->myip,
112					orig_broadcast_subnet->mask_ip ) ) {
113				DEBUG( 5, ( "wins_proxy_name_query_request_success: name %s is a WINS \
114proxy name and is also on the same subnet (%s) as the requestor. \
115Not replying.\n", nmb_namestr(&namerec->name), orig_broadcast_subnet->subnet_name ) );
116				return;
117			}
118		}
119	}
120
121	/* Finally reply to the original name query. */
122	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				rrec->rdata,                    /* data to send. */
128				rrec->rdlength);                /* data length. */
129}
130
131/****************************************************************************
132Function called when the name lookup failed.
133****************************************************************************/
134
135static 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	DEBUG(4,("wins_proxy_name_query_request_fail: WINS server returned error code %d for lookup \
140of name %s.\n", fail_code, nmb_namestr(question_name) ));
141}
142
143/****************************************************************************
144Function to make a deep copy of the userdata we will need when the WINS
145proxy query returns.
146****************************************************************************/
147
148static struct userdata_struct *wins_proxy_userdata_copy_fn(struct userdata_struct *userdata)
149{
150	struct packet_struct *p, *copy_of_p;
151	struct userdata_struct *new_userdata = (struct userdata_struct *)SMB_MALLOC( userdata->userdata_len );
152
153	if(new_userdata == NULL)
154		return NULL;
155
156	new_userdata->copy_fn = userdata->copy_fn;
157	new_userdata->free_fn = userdata->free_fn;
158	new_userdata->userdata_len = userdata->userdata_len;
159
160	/* Copy the subnet_record pointer. */
161	memcpy( new_userdata->data, userdata->data, sizeof(struct subnet_record *) );
162
163	/* Extract the pointer to the packet struct */
164	memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)], sizeof(struct packet_struct *) );
165
166	/* Do a deep copy of the packet. */
167	if((copy_of_p = copy_packet(p)) == NULL) {
168		SAFE_FREE(new_userdata);
169		return NULL;
170	}
171
172	/* Lock the copy. */
173	copy_of_p->locked = True;
174
175	memcpy( &new_userdata->data[sizeof(struct subnet_record *)], (char *)&copy_of_p,
176		sizeof(struct packet_struct *) );
177
178	return new_userdata;
179}
180
181/****************************************************************************
182Function to free the deep copy of the userdata we used when the WINS
183proxy query returned.
184****************************************************************************/
185
186static 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	memcpy((char *)&p, &userdata->data[sizeof(struct subnet_record *)],
192		sizeof(struct packet_struct *));
193
194	/* Unlock the packet. */
195	p->locked = False;
196
197	free_packet(p);
198	ZERO_STRUCTP(userdata);
199	SAFE_FREE(userdata);
200}
201
202/****************************************************************************
203 Make a WINS query on behalf of a broadcast client name query request.
204****************************************************************************/
205
206void 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	struct userdata_struct *userdata = &ud.ud;
216	unstring qname;
217
218	memset(&ud, '\0', sizeof(ud));
219
220	userdata->copy_fn = wins_proxy_userdata_copy_fn;
221	userdata->free_fn = wins_proxy_userdata_free_fn;
222	userdata->userdata_len = sizeof(ud);
223	memcpy( userdata->data, (char *)&subrec, sizeof(struct subnet_record *));
224	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	pull_ascii_nstring(qname, sizeof(qname), question_name->name);
229	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}
234