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-rw-r--r--source3/nmbd/nmbd_winsproxy.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/source3/nmbd/nmbd_winsproxy.c b/source3/nmbd/nmbd_winsproxy.c
new file mode 100644
index 0000000..163d2c0
--- /dev/null
+++ b/source3/nmbd/nmbd_winsproxy.c
@@ -0,0 +1,233 @@
+/*
+ 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 *)&copy_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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