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/*
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "nmbd/nmbd.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)
{
unstring name;
struct packet_struct *original_packet;
struct subnet_record *orig_broadcast_subnet;
struct name_record *namerec = NULL;
uint16_t 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 *) );
if (rrec) {
nb_flags = get_nb_flags( rrec->rdata );
num_ips = rrec->rdlength / 6;
} else {
nb_flags = 0;
num_ips = 0;
}
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 = SMB_MALLOC_ARRAY( struct in_addr, num_ips )) == 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->ttl == PERMANENT_TTL) {
ttl = lp_max_ttl();
}
pull_ascii_nstring(name, sizeof(name), nmbname->name);
add_name_to_subnet( orig_broadcast_subnet, name,
nmbname->name_type, nb_flags, ttl,
WINS_PROXY_NAME, num_ips, iplist );
if(iplist != &ip) {
SAFE_FREE(iplist);
}
namerec = find_name_on_subnet(orig_broadcast_subnet, nmbname, FIND_ANY_NAME);
if (!namerec) {
DEBUG(0,("wins_proxy_name_query_request_success: failed to add "
"name %s to subnet %s !\n",
name,
orig_broadcast_subnet->subnet_name ));
return;
}
/*
* 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_v4( 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 requester. \
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 *)SMB_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)
{
union {
struct userdata_struct ud;
char c[sizeof(struct userdata_struct) + sizeof(struct subrec *) +
sizeof(struct packet_struct *)+sizeof(long*)];
} ud;
struct userdata_struct *userdata = &ud.ud;
unstring qname;
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. */
pull_ascii_nstring(qname, sizeof(qname), question_name->name);
query_name( unicast_subnet, qname, question_name->name_type,
wins_proxy_name_query_request_success,
wins_proxy_name_query_request_fail,
userdata);
}
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