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Diffstat (limited to 'source3/nmbd/nmbd_namerelease.c')
-rw-r--r--source3/nmbd/nmbd_namerelease.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/source3/nmbd/nmbd_namerelease.c b/source3/nmbd/nmbd_namerelease.c
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index 0000000000..8632dd7655
--- /dev/null
+++ b/source3/nmbd/nmbd_namerelease.c
@@ -0,0 +1,238 @@
+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ NBT netbios routines and daemon - version 2
+ Copyright (C) Andrew Tridgell 1994-1997
+ Copyright (C) Luke Kenneth Casson Leighton 1994-1997
+ Copyright (C) Jeremy Allison 1994-1997
+
+ 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"
+
+extern int DEBUGLEVEL;
+
+extern pstring scope;
+
+/****************************************************************************
+ Deal with a response packet when releasing one of our names.
+****************************************************************************/
+
+static void release_name_response(struct subnet_record *subrec,
+ struct response_record *rrec, struct packet_struct *p)
+{
+ /*
+ * If we are releasing broadcast, then getting a response is an
+ * error. If we are releasing unicast, then we expect to get a response.
+ */
+
+ struct nmb_packet *nmb = &p->packet.nmb;
+ BOOL bcast = nmb->header.nm_flags.bcast;
+ BOOL success = True;
+ struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
+ struct nmb_name *answer_name = &nmb->answers->rr_name;
+ struct in_addr released_ip;
+
+ /* Sanity check. Ensure that the answer name in the incoming packet is the
+ same as the requested name in the outgoing packet. */
+
+ if(!nmb_name_equal(question_name, answer_name))
+ {
+ DEBUG(0,("release_name_response: Answer name %s differs from question \
+name %s.\n", namestr(answer_name), namestr(question_name)));
+ return;
+ }
+
+ if(bcast)
+ {
+ /* Someone sent a response. This shouldn't happen/ */
+ DEBUG(1,("release_name_response: A response for releasing name %s was received on a\
+broadcast subnet %s. This should not happen !\n", namestr(answer_name), subrec->subnet_name));
+ return;
+ }
+ else
+ {
+ /* Unicast - check to see if the response allows us to release the name. */
+ if(nmb->header.rcode != 0)
+ {
+ /* Error code - we were told not to release the name ! What now ! */
+ success = False;
+
+ DEBUG(0,("release_name_response: WINS server at IP %s rejected our \
+name release of name %s with error code %d.\n", inet_ntoa(p->ip),
+ namestr(answer_name), nmb->header.rcode));
+
+ }
+ else 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 release requests. */
+
+ DEBUG(5,("release_name_response: WACK from WINS server %s in releasing \
+name %s on subnet %s.\n", inet_ntoa(p->ip), namestr(answer_name), subrec->subnet_name));
+
+ rrec->repeat_count = 0;
+ /* How long we should wait for. */
+ rrec->repeat_time = p->timestamp + nmb->answers->ttl;
+ rrec->num_msgs--;
+ return;
+ }
+ }
+
+ DEBUG(5,("release_name_response: %s in releasing name %s on subnet %s.\n",
+ success ? "success" : "failure", namestr(answer_name), subrec->subnet_name));
+
+ if(success)
+ {
+ putip((char*)&released_ip ,&nmb->answers->rdata[2]);
+
+ if(rrec->success_fn)
+ (*rrec->success_fn)(subrec, rrec->userdata, answer_name, released_ip);
+ standard_success_release( subrec, rrec->userdata, answer_name, released_ip);
+ }
+ else
+ {
+ /* We have no standard_fail_release - maybe we should add one ? */
+ if(rrec->fail_fn)
+ (*rrec->fail_fn)(subrec, rrec, answer_name);
+ }
+
+ remove_response_record(subrec, rrec);
+}
+
+/****************************************************************************
+ Deal with a timeout when releasing one of our names.
+****************************************************************************/
+
+static void release_name_timeout_response(struct subnet_record *subrec,
+ struct response_record *rrec)
+{
+ /*
+ * If we are releasing unicast, then NOT getting a response is an
+ * error - we could not release the name. If we are releasing broadcast,
+ * then we don't expect to get a response.
+ */
+
+ struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
+ BOOL bcast = sent_nmb->header.nm_flags.bcast;
+ BOOL success = False;
+ struct nmb_name *question_name = &sent_nmb->question.question_name;
+ struct in_addr released_ip;
+
+ if(bcast)
+ {
+ if(rrec->num_msgs == 0)
+ {
+ /* Not receiving a message is success for broadcast release. */
+ success = True;
+
+ /* Get the ip address we were trying to release. */
+ putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]);
+ }
+ }
+ else
+ {
+ /* Unicast - if no responses then it's an error. */
+ if(rrec->num_msgs == 0)
+ {
+ DEBUG(2,("release_name_timeout_response: WINS server at address %s is not \
+responding.\n", inet_ntoa(rrec->packet->ip)));
+
+ /* Keep trying to contact the WINS server periodically. This allows
+ us to work correctly if the WINS server is down temporarily when
+ we want to delete the name. */
+
+ /* Reset the number of attempts to zero and double the interval between
+ retries. Max out at 5 minutes. */
+ rrec->repeat_count = 3;
+ rrec->repeat_interval *= 2;
+ if(rrec->repeat_interval > (5 * 60))
+ rrec->repeat_interval = (5 * 60);
+ rrec->repeat_time = time(NULL) + rrec->repeat_interval;
+
+ DEBUG(5,("release_name_timeout_response: increasing WINS timeout to %d seconds.\n",
+ rrec->repeat_interval));
+ return; /* Don't remove the response record. */
+ }
+ }
+
+ DEBUG(5,("release_name_timeout_response: %s in releasing name %s on subnet %s.\n",
+ success ? "success" : "failure", namestr(question_name), subrec->subnet_name));
+
+ if(success && rrec->success_fn)
+ {
+ if(rrec->success_fn)
+ (*rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip);
+ standard_success_release( subrec, rrec->userdata, question_name, released_ip);
+ }
+ else
+ {
+ /* We have no standard_fail_release - maybe we should add one ? */
+ if( rrec->fail_fn)
+ (*rrec->fail_fn)(subrec, rrec, question_name);
+ }
+
+ remove_response_record(subrec, rrec);
+}
+
+/****************************************************************************
+ Try and release one of our names.
+****************************************************************************/
+
+BOOL release_name(struct subnet_record *subrec, struct name_record *namerec,
+ release_name_success_function success_fn,
+ release_name_fail_function fail_fn,
+ struct userdata_struct *userdata)
+{
+ int i;
+
+ /* Ensure it's a SELF name, and in the ACTIVE state. */
+ if((namerec->source != SELF_NAME) || !NAME_IS_ACTIVE(namerec))
+ {
+ DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n",
+ namestr(&namerec->name), subrec->subnet_name, namerec->source));
+ return True;
+ }
+
+ /* Set the name into the deregistering state. */
+ namerec->nb_flags |= NB_DEREG;
+
+ /*
+ * Go through and release the name for all known ip addresses.
+ * Only call the success/fail function on the last one (it should
+ * only be done once).
+ */
+
+ for( i = 0; i < namerec->num_ips; i++)
+ {
+ if(queue_release_name( subrec,
+ release_name_response,
+ release_name_timeout_response,
+ (i == (namerec->num_ips - 1)) ? success_fn : NULL,
+ (i == (namerec->num_ips - 1)) ? fail_fn : NULL,
+ (i == (namerec->num_ips - 1)) ? userdata : NULL,
+ &namerec->name,
+ namerec->nb_flags,
+ namerec->ip[i]) == NULL)
+ {
+ DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
+ namestr(&namerec->name), inet_ntoa(namerec->ip[i]) ));
+ return True;
+ }
+ }
+ return False;
+}