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Diffstat (limited to 'source3/nmbd/nmbd_namequery.c')
-rw-r--r--source3/nmbd/nmbd_namequery.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/source3/nmbd/nmbd_namequery.c b/source3/nmbd/nmbd_namequery.c
new file mode 100644
index 0000000000..c1c5f5238a
--- /dev/null
+++ b/source3/nmbd/nmbd_namequery.c
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+/*
+ Unix SMB/CIFS implementation.
+ NBT netbios routines and daemon - version 2
+ Copyright (C) Andrew Tridgell 1994-1998
+ Copyright (C) Luke Kenneth Casson Leighton 1994-1998
+ Copyright (C) Jeremy Allison 1994-2003
+
+ 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"
+
+/****************************************************************************
+ Deal with a response packet when querying a name.
+****************************************************************************/
+
+static void query_name_response( struct subnet_record *subrec,
+ struct response_record *rrec,
+ struct packet_struct *p)
+{
+ struct nmb_packet *nmb = &p->packet.nmb;
+ bool success = False;
+ struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
+ struct in_addr answer_ip;
+
+ zero_ip_v4(&answer_ip);
+
+ /* Ensure we don't retry the query but leave the response record cleanup
+ to the timeout code. We may get more answer responses in which case
+ we should mark the name in conflict.. */
+ rrec->repeat_count = 0;
+
+ if(rrec->num_msgs == 1) {
+ /* This is the first response. */
+
+ if(nmb->header.opcode == NMB_WACK_OPCODE) {
+ /* WINS server is telling us to wait. Pretend we didn't get
+ the response but don't send out any more query requests. */
+
+ if( DEBUGLVL( 5 ) ) {
+ dbgtext( "query_name_response: " );
+ dbgtext( "WACK from WINS server %s ", inet_ntoa(p->ip) );
+ dbgtext( "in querying name %s ", nmb_namestr(question_name) );
+ dbgtext( "on subnet %s.\n", subrec->subnet_name );
+ }
+
+ rrec->repeat_count = 0;
+ /* How long we should wait for. */
+ if (nmb->answers) {
+ rrec->repeat_time = p->timestamp + nmb->answers->ttl;
+ } else {
+ /* No answer - this is probably a corrupt
+ packet.... */
+ DEBUG(0,("query_name_response: missing answer record in "
+ "NMB_WACK_OPCODE response.\n"));
+ rrec->repeat_time = p->timestamp + 10;
+ }
+ rrec->num_msgs--;
+ return;
+ } else if(nmb->header.rcode != 0) {
+
+ success = False;
+
+ if( DEBUGLVL( 5 ) ) {
+ dbgtext( "query_name_response: On subnet %s ", subrec->subnet_name );
+ dbgtext( "- negative response from IP %s ", inet_ntoa(p->ip) );
+ dbgtext( "for name %s. ", nmb_namestr(question_name) );
+ dbgtext( "Error code was %d.\n", nmb->header.rcode );
+ }
+ } else {
+ if (!nmb->answers) {
+ dbgtext( "query_name_response: On subnet %s ", subrec->subnet_name );
+ dbgtext( "IP %s ", inet_ntoa(p->ip) );
+ dbgtext( "returned a success response with no answer\n" );
+ return;
+ }
+
+ success = True;
+
+ putip((char *)&answer_ip,&nmb->answers->rdata[2]);
+
+ if( DEBUGLVL( 5 ) ) {
+ dbgtext( "query_name_response: On subnet %s ", subrec->subnet_name );
+ dbgtext( "- positive response from IP %s ", inet_ntoa(p->ip) );
+ dbgtext( "for name %s. ", nmb_namestr(question_name) );
+ dbgtext( "IP of that name is %s\n", inet_ntoa(answer_ip) );
+ }
+
+ /* Interestingly, we could add these names to our namelists, and
+ change nmbd to a model that checked its own name cache first,
+ before sending out a query. This is a task for another day, though.
+ */
+ }
+ } else if( rrec->num_msgs > 1) {
+
+ if( DEBUGLVL( 0 ) ) {
+ if (nmb->answers)
+ putip( (char *)&answer_ip, &nmb->answers->rdata[2] );
+ dbgtext( "query_name_response: " );
+ dbgtext( "Multiple (%d) responses ", rrec->num_msgs );
+ dbgtext( "received for a query on subnet %s ", subrec->subnet_name );
+ dbgtext( "for name %s.\nThis response ", nmb_namestr(question_name) );
+ dbgtext( "was from IP %s, reporting ", inet_ntoa(p->ip) );
+ dbgtext( "an IP address of %s.\n", inet_ntoa(answer_ip) );
+ }
+
+ /* We have already called the success or fail function, so we
+ don't call again here. Leave the response record around in
+ case we get more responses. */
+
+ return;
+ }
+
+ if(success && rrec->success_fn)
+ (*(query_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, answer_ip, nmb->answers);
+ else if( rrec->fail_fn)
+ (*(query_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name, nmb->header.rcode);
+
+}
+
+/****************************************************************************
+ Deal with a timeout when querying a name.
+****************************************************************************/
+
+static void query_name_timeout_response(struct subnet_record *subrec,
+ struct response_record *rrec)
+{
+ struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
+ /* We can only fail here, never succeed. */
+ bool failed = True;
+ struct nmb_name *question_name = &sent_nmb->question.question_name;
+
+ if(rrec->num_msgs != 0) {
+ /* We got at least one response, and have called the success/fail
+ function already. */
+
+ failed = False;
+ }
+
+ if(failed) {
+ if( DEBUGLVL( 5 ) ) {
+ dbgtext( "query_name_timeout_response: No response to " );
+ dbgtext( "query for name %s ", nmb_namestr(question_name) );
+ dbgtext( "on subnet %s.\n", subrec->subnet_name );
+ }
+
+ if(rrec->fail_fn)
+ (*(query_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name, 0);
+ }
+
+ remove_response_record(subrec, rrec);
+}
+
+/****************************************************************************
+ Lookup a name on our local namelists. We check the lmhosts file first. If the
+ name is not there we look for the name on the given subnet.
+****************************************************************************/
+
+static bool query_local_namelists(struct subnet_record *subrec, struct nmb_name *nmbname,
+ struct name_record **namerecp)
+{
+ struct name_record *namerec;
+
+ *namerecp = NULL;
+
+ if(find_name_in_lmhosts(nmbname, namerecp))
+ return True;
+
+ if((namerec = find_name_on_subnet(subrec, nmbname, FIND_ANY_NAME))==NULL)
+ return False;
+
+ if( NAME_IS_ACTIVE(namerec) && ( (namerec->data.source == SELF_NAME) || (namerec->data.source == LMHOSTS_NAME) ) ) {
+ *namerecp = namerec;
+ return True;
+ }
+ return False;
+}
+
+/****************************************************************************
+ Try and query for a name.
+****************************************************************************/
+
+bool query_name(struct subnet_record *subrec, const char *name, int type,
+ query_name_success_function success_fn,
+ query_name_fail_function fail_fn,
+ struct userdata_struct *userdata)
+{
+ struct nmb_name nmbname;
+ struct name_record *namerec;
+
+ make_nmb_name(&nmbname, name, type);
+
+ /*
+ * We need to check our local namelists first.
+ * It may be an magic name, lmhosts name or just
+ * a name we have registered.
+ */
+
+ if(query_local_namelists(subrec, &nmbname, &namerec) == True) {
+ struct res_rec rrec;
+ int i;
+
+ memset((char *)&rrec, '\0', sizeof(struct res_rec));
+
+ /* Fake up the needed res_rec just in case it's used. */
+ rrec.rr_name = nmbname;
+ rrec.rr_type = RR_TYPE_NB;
+ rrec.rr_class = RR_CLASS_IN;
+ rrec.ttl = PERMANENT_TTL;
+ rrec.rdlength = namerec->data.num_ips * 6;
+ if(rrec.rdlength > MAX_DGRAM_SIZE) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "query_name: nmbd internal error - " );
+ dbgtext( "there are %d ip addresses ", namerec->data.num_ips );
+ dbgtext( "for name %s.\n", nmb_namestr(&nmbname) );
+ }
+ return False;
+ }
+
+ for( i = 0; i < namerec->data.num_ips; i++) {
+ set_nb_flags( &rrec.rdata[i*6], namerec->data.nb_flags );
+ putip( &rrec.rdata[(i*6) + 2], (char *)&namerec->data.ip[i]);
+ }
+
+ /* Call the success function directly. */
+ if(success_fn)
+ (*(query_name_success_function)success_fn)(subrec, userdata, &nmbname, namerec->data.ip[0], &rrec);
+ return False;
+ }
+
+ if(queue_query_name( subrec, query_name_response, query_name_timeout_response, success_fn, fail_fn, userdata, &nmbname) == NULL) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "query_name: Failed to send packet " );
+ dbgtext( "trying to query name %s\n", nmb_namestr(&nmbname) );
+ }
+ return True;
+ }
+ return False;
+}
+
+/****************************************************************************
+ Try and query for a name from nmbd acting as a WINS server.
+****************************************************************************/
+
+bool query_name_from_wins_server(struct in_addr ip_to,
+ const char *name, int type,
+ query_name_success_function success_fn,
+ query_name_fail_function fail_fn,
+ struct userdata_struct *userdata)
+{
+ struct nmb_name nmbname;
+
+ make_nmb_name(&nmbname, name, type);
+
+ if(queue_query_name_from_wins_server( ip_to, query_name_response, query_name_timeout_response, success_fn, fail_fn, userdata, &nmbname) == NULL) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "query_name_from_wins_server: Failed to send packet " );
+ dbgtext( "trying to query name %s\n", nmb_namestr(&nmbname) );
+ }
+ return True;
+ }
+ return False;
+}
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