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-rw-r--r--source3/nmbd/nmbd_namerelease.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/source3/nmbd/nmbd_namerelease.c b/source3/nmbd/nmbd_namerelease.c
new file mode 100644
index 0000000..4f34a45
--- /dev/null
+++ b/source3/nmbd/nmbd_namerelease.c
@@ -0,0 +1,222 @@
+/*
+ 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 1994-1998
+
+ 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"
+
+/****************************************************************************
+ 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",
+ nmb_namestr(answer_name), nmb_namestr(question_name)));
+ return;
+ }
+
+ if (bcast) {
+ /* Someone sent a response to a bcast release? ignore it. */
+ return;
+ }
+
+ /* 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),
+ nmb_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), nmb_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", nmb_namestr(answer_name), subrec->subnet_name));
+ if (success) {
+ putip((char*)&released_ip ,&nmb->answers->rdata[2]);
+
+ if(rrec->success_fn)
+ (*(release_name_success_function)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) {
+ (*(release_name_fail_function)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)
+{
+ /* a release is *always* considered to be successful when it
+ times out. This doesn't cause problems as if a WINS server
+ doesn't respond and someone else wants the name then the
+ normal WACK/name query from the WINS server will cope */
+ struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
+ bool bcast = sent_nmb->header.nm_flags.bcast;
+ struct nmb_name *question_name = &sent_nmb->question.question_name;
+ struct in_addr released_ip;
+
+ /* Get the ip address we were trying to release. */
+ putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]);
+
+ if (!bcast) {
+ /* mark the WINS server temporarily dead */
+ wins_srv_died(rrec->packet->ip, released_ip);
+ }
+
+ DEBUG(5,("release_name_timeout_response: success in releasing name %s on subnet %s.\n",
+ nmb_namestr(question_name), subrec->subnet_name));
+
+ if (rrec->success_fn) {
+ (*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip);
+ }
+
+ standard_success_release( subrec, rrec->userdata, question_name, released_ip);
+ remove_response_record(subrec, rrec);
+}
+
+
+/*
+ when releasing a name with WINS we need to send the release to each of
+ the WINS groups
+*/
+static void wins_release_name(struct name_record *namerec,
+ release_name_success_function success_fn,
+ release_name_fail_function fail_fn,
+ struct userdata_struct *userdata)
+{
+ int t, i;
+ char **wins_tags;
+
+ /* get the list of wins tags - we try to release for each of them */
+ wins_tags = wins_srv_tags();
+
+ for (t=0;wins_tags && wins_tags[t]; t++) {
+ for (i = 0; i < namerec->data.num_ips; i++) {
+ struct in_addr wins_ip = wins_srv_ip_tag(wins_tags[t], namerec->data.ip[i]);
+
+ bool last_one = ((i==namerec->data.num_ips - 1) && !wins_tags[t+1]);
+ if (queue_release_name(unicast_subnet,
+ release_name_response,
+ release_name_timeout_response,
+ last_one?success_fn : NULL,
+ last_one? fail_fn : NULL,
+ last_one? userdata : NULL,
+ &namerec->name,
+ namerec->data.nb_flags,
+ namerec->data.ip[i],
+ wins_ip) == NULL) {
+ DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
+ nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
+ }
+ }
+ }
+
+ wins_srv_tags_free(wins_tags);
+}
+
+
+/****************************************************************************
+ Try and release one of our names.
+****************************************************************************/
+
+void 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->data.source != SELF_NAME) || !NAME_IS_ACTIVE(namerec)) {
+ DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n",
+ nmb_namestr(&namerec->name), subrec->subnet_name, namerec->data.source));
+ return;
+ }
+
+ /* Set the name into the deregistering state. */
+ namerec->data.nb_flags |= NB_DEREG;
+
+ /* wins releases are a bit different */
+ if (subrec == unicast_subnet) {
+ wins_release_name(namerec, success_fn, fail_fn, userdata);
+ return;
+ }
+
+ /*
+ * 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->data.num_ips; i++) {
+ if (queue_release_name(subrec,
+ release_name_response,
+ release_name_timeout_response,
+ (i == (namerec->data.num_ips - 1)) ? success_fn : NULL,
+ (i == (namerec->data.num_ips - 1)) ? fail_fn : NULL,
+ (i == (namerec->data.num_ips - 1)) ? userdata : NULL,
+ &namerec->name,
+ namerec->data.nb_flags,
+ namerec->data.ip[i],
+ subrec->bcast_ip) == NULL) {
+ DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
+ nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
+ }
+ }
+}
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