first public release of samba4 code

(This used to be commit b0510b5428b3461aeb9bbe3cc95f62fc73e2b97f)

1 files changed, 222 insertions, 0 deletions

diff --git a/source4/nmbd/nmbd_namerelease.c b/source4/nmbd/nmbd_namerelease.c
new file mode 100644
index 0000000000..0611ca9323
--- /dev/null
+++ b/source4/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 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"
+
+/****************************************************************************
+ 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]) ));
+		}
+	}
+}