--- /dev/null
+/*
+ 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 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"
+
+/* This is our local master browser list database. */
+extern ubi_dlList lmb_browserlist[];
+
+/****************************************************************************
+As a domain master browser, do a sync with a local master browser.
+**************************************************************************/
+
+static void sync_with_lmb(struct browse_cache_record *browc)
+{
+ struct work_record *work;
+
+ if( !(work = find_workgroup_on_subnet(unicast_subnet, browc->work_group)) ) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "sync_with_lmb:\n" );
+ dbgtext( "Failed to get a workgroup for a local master browser " );
+ dbgtext( "cache entry workgroup " );
+ dbgtext( "%s, server %s\n", browc->work_group, browc->lmb_name );
+ }
+ return;
+ }
+
+ /* We should only be doing this if we are a domain master browser for
+ the given workgroup. Ensure this is so. */
+
+ if(!AM_DOMAIN_MASTER_BROWSER(work)) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "sync_with_lmb:\n" );
+ dbgtext( "We are trying to sync with a local master browser " );
+ dbgtext( "%s for workgroup %s\n", browc->lmb_name, browc->work_group );
+ dbgtext( "and we are not a domain master browser on this workgroup.\n" );
+ dbgtext( "Error!\n" );
+ }
+ return;
+ }
+
+ if( DEBUGLVL( 2 ) ) {
+ dbgtext( "sync_with_lmb:\n" );
+ dbgtext( "Initiating sync with local master browser " );
+ dbgtext( "%s<0x20> at IP %s ", browc->lmb_name, inet_ntoa(browc->ip) );
+ dbgtext( "for workgroup %s\n", browc->work_group );
+ }
+
+ sync_browse_lists(work, browc->lmb_name, 0x20, browc->ip, True, True);
+
+ browc->sync_time += (CHECK_TIME_DMB_TO_LMB_SYNC * 60);
+}
+
+/****************************************************************************
+Sync or expire any local master browsers.
+**************************************************************************/
+
+void dmb_expire_and_sync_browser_lists(time_t t)
+{
+ static time_t last_run = 0;
+ struct browse_cache_record *browc;
+
+ /* Only do this every 20 seconds. */
+ if (t - last_run < 20)
+ return;
+
+ last_run = t;
+
+ expire_lmb_browsers(t);
+
+ for( browc = (struct browse_cache_record *)ubi_dlFirst( lmb_browserlist );
+ browc;
+ browc = (struct browse_cache_record *)ubi_dlNext( browc ) ) {
+ if (browc->sync_time < t)
+ sync_with_lmb(browc);
+ }
+}
+
+/****************************************************************************
+As a local master browser, send an announce packet to the domain master browser.
+**************************************************************************/
+
+static void announce_local_master_browser_to_domain_master_browser( struct work_record *work)
+{
+ pstring outbuf;
+ unstring myname;
+ unstring dmb_name;
+ char *p;
+
+ if(ismyip(work->dmb_addr)) {
+ if( DEBUGLVL( 2 ) ) {
+ dbgtext( "announce_local_master_browser_to_domain_master_browser:\n" );
+ dbgtext( "We are both a domain and a local master browser for " );
+ dbgtext( "workgroup %s. ", work->work_group );
+ dbgtext( "Do not announce to ourselves.\n" );
+ }
+ return;
+ }
+
+ memset(outbuf,'\0',sizeof(outbuf));
+ p = outbuf;
+ SCVAL(p,0,ANN_MasterAnnouncement);
+ p++;
+
+ unstrcpy(myname, global_myname());
+ strupper_m(myname);
+ myname[15]='\0';
+ /* The call below does CH_UNIX -> CH_DOS conversion. JRA */
+ push_pstring_base(p, myname, outbuf);
+
+ p = skip_string(p,1);
+
+ if( DEBUGLVL( 4 ) ) {
+ dbgtext( "announce_local_master_browser_to_domain_master_browser:\n" );
+ dbgtext( "Sending local master announce to " );
+ dbgtext( "%s for workgroup %s.\n", nmb_namestr(&work->dmb_name),
+ work->work_group );
+ }
+
+ /* Target name for send_mailslot must be in UNIX charset. */
+ pull_ascii_nstring(dmb_name, sizeof(dmb_name), work->dmb_name.name);
+ send_mailslot(True, BROWSE_MAILSLOT, outbuf,PTR_DIFF(p,outbuf),
+ global_myname(), 0x0, dmb_name, 0x0,
+ work->dmb_addr, FIRST_SUBNET->myip, DGRAM_PORT);
+}
+
+/****************************************************************************
+As a local master browser, do a sync with a domain master browser.
+**************************************************************************/
+
+static void sync_with_dmb(struct work_record *work)
+{
+ unstring dmb_name;
+
+ if( DEBUGLVL( 2 ) ) {
+ dbgtext( "sync_with_dmb:\n" );
+ dbgtext( "Initiating sync with domain master browser " );
+ dbgtext( "%s ", nmb_namestr(&work->dmb_name) );
+ dbgtext( "at IP %s ", inet_ntoa(work->dmb_addr) );
+ dbgtext( "for workgroup %s\n", work->work_group );
+ }
+
+ pull_ascii_nstring(dmb_name, sizeof(dmb_name), work->dmb_name.name);
+ sync_browse_lists(work, dmb_name, work->dmb_name.name_type,
+ work->dmb_addr, False, True);
+}
+
+/****************************************************************************
+ Function called when a node status query to a domain master browser IP succeeds.
+****************************************************************************/
+
+static void domain_master_node_status_success(struct subnet_record *subrec,
+ struct userdata_struct *userdata,
+ struct res_rec *answers,
+ struct in_addr from_ip)
+{
+ struct work_record *work = find_workgroup_on_subnet( subrec, userdata->data);
+
+ if( work == NULL ) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "domain_master_node_status_success:\n" );
+ dbgtext( "Unable to find workgroup " );
+ dbgtext( "%s on subnet %s.\n", userdata->data, subrec->subnet_name );
+ }
+ return;
+ }
+
+ if( DEBUGLVL( 3 ) ) {
+ dbgtext( "domain_master_node_status_success:\n" );
+ dbgtext( "Success in node status for workgroup " );
+ dbgtext( "%s from ip %s\n", work->work_group, inet_ntoa(from_ip) );
+ }
+
+ /* Go through the list of names found at answers->rdata and look for
+ the first SERVER<0x20> name. */
+
+ if(answers->rdata != NULL) {
+ char *p = answers->rdata;
+ int numnames = CVAL(p, 0);
+
+ p += 1;
+
+ while (numnames--) {
+ unstring qname;
+ uint16 nb_flags;
+ int name_type;
+
+ pull_ascii_nstring(qname, sizeof(qname), p);
+ name_type = CVAL(p,15);
+ nb_flags = get_nb_flags(&p[16]);
+ trim_char(qname,'\0',' ');
+
+ p += 18;
+
+ if(!(nb_flags & NB_GROUP) && (name_type == 0x20)) {
+ struct nmb_name nmbname;
+
+ make_nmb_name(&nmbname, qname, name_type);
+
+ /* Copy the dmb name and IP address
+ into the workgroup struct. */
+
+ work->dmb_name = nmbname;
+ putip((char *)&work->dmb_addr, &from_ip);
+
+ /* Do the local master browser announcement to the domain
+ master browser name and IP. */
+ announce_local_master_browser_to_domain_master_browser( work );
+
+ /* Now synchronise lists with the domain master browser. */
+ sync_with_dmb(work);
+ break;
+ }
+ }
+ } else if( DEBUGLVL( 0 ) ) {
+ dbgtext( "domain_master_node_status_success:\n" );
+ dbgtext( "Failed to find a SERVER<0x20> name in reply from IP " );
+ dbgtext( "%s.\n", inet_ntoa(from_ip) );
+ }
+}
+
+/****************************************************************************
+ Function called when a node status query to a domain master browser IP fails.
+****************************************************************************/
+
+static void domain_master_node_status_fail(struct subnet_record *subrec,
+ struct response_record *rrec)
+{
+ struct userdata_struct *userdata = rrec->userdata;
+
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "domain_master_node_status_fail:\n" );
+ dbgtext( "Doing a node status request to the domain master browser\n" );
+ dbgtext( "for workgroup %s ", userdata ? userdata->data : "NULL" );
+ dbgtext( "at IP %s failed.\n", inet_ntoa(rrec->packet->ip) );
+ dbgtext( "Cannot sync browser lists.\n" );
+ }
+}
+
+/****************************************************************************
+ Function called when a query for a WORKGROUP<1b> name succeeds.
+****************************************************************************/
+
+static void find_domain_master_name_query_success(struct subnet_record *subrec,
+ struct userdata_struct *userdata_in,
+ struct nmb_name *q_name, struct in_addr answer_ip, struct res_rec *rrec)
+{
+ /*
+ * Unfortunately, finding the IP address of the Domain Master Browser,
+ * as we have here, is not enough. We need to now do a sync to the
+ * SERVERNAME<0x20> NetBIOS name, as only recent NT servers will
+ * respond to the SMBSERVER name. To get this name from IP
+ * address we do a Node status request, and look for the first
+ * NAME<0x20> in the response, and take that as the server name.
+ * We also keep a cache of the Domain Master Browser name for this
+ * workgroup in the Workgroup struct, so that if the same IP addess
+ * is returned every time, we don't need to do the node status
+ * request.
+ */
+
+ struct work_record *work;
+ struct nmb_name nmbname;
+ struct userdata_struct *userdata;
+ size_t size = sizeof(struct userdata_struct) + sizeof(fstring)+1;
+ unstring qname;
+
+ pull_ascii_nstring(qname, sizeof(qname), q_name->name);
+ if( !(work = find_workgroup_on_subnet(subrec, qname)) ) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "find_domain_master_name_query_success:\n" );
+ dbgtext( "Failed to find workgroup %s\n", qname);
+ }
+ return;
+ }
+
+ /* First check if we already have a dmb for this workgroup. */
+
+ if(!is_zero_ip(work->dmb_addr) && ip_equal(work->dmb_addr, answer_ip)) {
+ /* Do the local master browser announcement to the domain
+ master browser name and IP. */
+ announce_local_master_browser_to_domain_master_browser( work );
+
+ /* Now synchronise lists with the domain master browser. */
+ sync_with_dmb(work);
+ return;
+ } else {
+ zero_ip(&work->dmb_addr);
+ }
+
+ /* Now initiate the node status request. */
+
+ /* We used to use the name "*",0x0 here, but some Windows
+ * servers don't answer that name. However we *know* they
+ * have the name workgroup#1b (as we just looked it up).
+ * So do the node status request on this name instead.
+ * Found at LBL labs. JRA.
+ */
+
+ make_nmb_name(&nmbname,work->work_group,0x1b);
+
+ /* Put the workgroup name into the userdata so we know
+ what workgroup we're talking to when the reply comes
+ back. */
+
+ /* Setup the userdata_struct - this is copied so we can use
+ a stack variable for this. */
+
+ if((userdata = (struct userdata_struct *)SMB_MALLOC(size)) == NULL) {
+ DEBUG(0, ("find_domain_master_name_query_success: malloc fail.\n"));
+ return;
+ }
+
+ userdata->copy_fn = NULL;
+ userdata->free_fn = NULL;
+ userdata->userdata_len = strlen(work->work_group)+1;
+ overmalloc_safe_strcpy(userdata->data, work->work_group, size - sizeof(*userdata) - 1);
+
+ node_status( subrec, &nmbname, answer_ip,
+ domain_master_node_status_success,
+ domain_master_node_status_fail,
+ userdata);
+
+ zero_free(userdata, size);
+}
+
+/****************************************************************************
+ Function called when a query for a WORKGROUP<1b> name fails.
+ ****************************************************************************/
+
+static void find_domain_master_name_query_fail(struct subnet_record *subrec,
+ struct response_record *rrec,
+ struct nmb_name *question_name, int fail_code)
+{
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "find_domain_master_name_query_fail:\n" );
+ dbgtext( "Unable to find the Domain Master Browser name " );
+ dbgtext( "%s for the workgroup %s.\n",
+ nmb_namestr(question_name), question_name->name );
+ dbgtext( "Unable to sync browse lists in this workgroup.\n" );
+ }
+}
+
+/****************************************************************************
+As a local master browser for a workgroup find the domain master browser
+name, announce ourselves as local master browser to it and then pull the
+full domain browse lists from it onto the given subnet.
+**************************************************************************/
+
+void announce_and_sync_with_domain_master_browser( struct subnet_record *subrec,
+ struct work_record *work)
+{
+ /* Only do this if we are using a WINS server. */
+ if(we_are_a_wins_client() == False) {
+ if( DEBUGLVL( 10 ) ) {
+ dbgtext( "announce_and_sync_with_domain_master_browser:\n" );
+ dbgtext( "Ignoring, as we are not a WINS client.\n" );
+ }
+ return;
+ }
+
+ /* First, query for the WORKGROUP<1b> name from the WINS server. */
+ query_name(unicast_subnet, work->work_group, 0x1b,
+ find_domain_master_name_query_success,
+ find_domain_master_name_query_fail,
+ NULL);
+}
+
+/****************************************************************************
+ Function called when a node status query to a domain master browser IP succeeds.
+ This function is only called on query to a Samba 1.9.18 or above WINS server.
+
+ Note that adding the workgroup name is enough for this workgroup to be
+ browsable by clients, as clients query the WINS server or broadcast
+ nets for the WORKGROUP<1b> name when they want to browse a workgroup
+ they are not in. We do not need to do a sync with this Domain Master
+ Browser in order for our browse clients to see machines in this workgroup.
+ JRA.
+****************************************************************************/
+
+static void get_domain_master_name_node_status_success(struct subnet_record *subrec,
+ struct userdata_struct *userdata,
+ struct res_rec *answers,
+ struct in_addr from_ip)
+{
+ struct work_record *work;
+ unstring server_name;
+
+ server_name[0] = 0;
+
+ if( DEBUGLVL( 3 ) ) {
+ dbgtext( "get_domain_master_name_node_status_success:\n" );
+ dbgtext( "Success in node status from ip %s\n", inet_ntoa(from_ip) );
+ }
+
+ /*
+ * Go through the list of names found at answers->rdata and look for
+ * the first WORKGROUP<0x1b> name.
+ */
+
+ if(answers->rdata != NULL) {
+ char *p = answers->rdata;
+ int numnames = CVAL(p, 0);
+
+ p += 1;
+
+ while (numnames--) {
+ unstring qname;
+ uint16 nb_flags;
+ int name_type;
+
+ pull_ascii_nstring(qname, sizeof(qname), p);
+ name_type = CVAL(p,15);
+ nb_flags = get_nb_flags(&p[16]);
+ trim_char(qname,'\0',' ');
+
+ p += 18;
+
+ if(!(nb_flags & NB_GROUP) && (name_type == 0x00) &&
+ server_name[0] == 0) {
+ /* this is almost certainly the server netbios name */
+ unstrcpy(server_name, qname);
+ continue;
+ }
+
+ if(!(nb_flags & NB_GROUP) && (name_type == 0x1b)) {
+ if( DEBUGLVL( 5 ) ) {
+ dbgtext( "get_domain_master_name_node_status_success:\n" );
+ dbgtext( "%s(%s) ", server_name, inet_ntoa(from_ip) );
+ dbgtext( "is a domain master browser for workgroup " );
+ dbgtext( "%s. Adding this name.\n", qname );
+ }
+
+ /*
+ * If we don't already know about this workgroup, add it
+ * to the workgroup list on the unicast_subnet.
+ */
+
+ if((work = find_workgroup_on_subnet( subrec, qname)) == NULL) {
+ struct nmb_name nmbname;
+ /*
+ * Add it - with an hour in the cache.
+ */
+ if(!(work= create_workgroup_on_subnet(subrec, qname, 60*60)))
+ return;
+
+ /* remember who the master is */
+ unstrcpy(work->local_master_browser_name, server_name);
+ make_nmb_name(&nmbname, server_name, 0x20);
+ work->dmb_name = nmbname;
+ work->dmb_addr = from_ip;
+ }
+ break;
+ }
+ }
+ } else if( DEBUGLVL( 0 ) ) {
+ dbgtext( "get_domain_master_name_node_status_success:\n" );
+ dbgtext( "Failed to find a WORKGROUP<0x1b> name in reply from IP " );
+ dbgtext( "%s.\n", inet_ntoa(from_ip) );
+ }
+}
+
+/****************************************************************************
+ Function called when a node status query to a domain master browser IP fails.
+****************************************************************************/
+
+static void get_domain_master_name_node_status_fail(struct subnet_record *subrec,
+ struct response_record *rrec)
+{
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "get_domain_master_name_node_status_fail:\n" );
+ dbgtext( "Doing a node status request to the domain master browser " );
+ dbgtext( "at IP %s failed.\n", inet_ntoa(rrec->packet->ip) );
+ dbgtext( "Cannot get workgroup name.\n" );
+ }
+}
+
+/****************************************************************************
+ Function called when a query for *<1b> name succeeds.
+****************************************************************************/
+
+static void find_all_domain_master_names_query_success(struct subnet_record *subrec,
+ struct userdata_struct *userdata_in,
+ struct nmb_name *q_name, struct in_addr answer_ip, struct res_rec *rrec)
+{
+ /*
+ * We now have a list of all the domain master browsers for all workgroups
+ * that have registered with the WINS server. Now do a node status request
+ * to each one and look for the first 1b name in the reply. This will be
+ * the workgroup name that we will add to the unicast subnet as a 'non-local'
+ * workgroup.
+ */
+
+ struct nmb_name nmbname;
+ struct in_addr send_ip;
+ int i;
+
+ if( DEBUGLVL( 5 ) ) {
+ dbgtext( "find_all_domain_master_names_query_succes:\n" );
+ dbgtext( "Got answer from WINS server of %d ", (rrec->rdlength / 6) );
+ dbgtext( "IP addresses for Domain Master Browsers.\n" );
+ }
+
+ for(i = 0; i < rrec->rdlength / 6; i++) {
+ /* Initiate the node status requests. */
+ make_nmb_name(&nmbname, "*", 0);
+
+ putip((char *)&send_ip, (char *)&rrec->rdata[(i*6) + 2]);
+
+ /*
+ * Don't send node status requests to ourself.
+ */
+
+ if(ismyip( send_ip )) {
+ if( DEBUGLVL( 5 ) ) {
+ dbgtext( "find_all_domain_master_names_query_succes:\n" );
+ dbgtext( "Not sending node status to our own IP " );
+ dbgtext( "%s.\n", inet_ntoa(send_ip) );
+ }
+ continue;
+ }
+
+ if( DEBUGLVL( 5 ) ) {
+ dbgtext( "find_all_domain_master_names_query_success:\n" );
+ dbgtext( "Sending node status request to IP %s.\n", inet_ntoa(send_ip) );
+ }
+
+ node_status( subrec, &nmbname, send_ip,
+ get_domain_master_name_node_status_success,
+ get_domain_master_name_node_status_fail,
+ NULL);
+ }
+}
+
+/****************************************************************************
+ Function called when a query for *<1b> name fails.
+ ****************************************************************************/
+static void find_all_domain_master_names_query_fail(struct subnet_record *subrec,
+ struct response_record *rrec,
+ struct nmb_name *question_name, int fail_code)
+{
+ if( DEBUGLVL( 10 ) ) {
+ dbgtext( "find_domain_master_name_query_fail:\n" );
+ dbgtext( "WINS server did not reply to a query for name " );
+ dbgtext( "%s.\nThis means it ", nmb_namestr(question_name) );
+ dbgtext( "is probably not a Samba 1.9.18 or above WINS server.\n" );
+ }
+}
+
+/****************************************************************************
+ If we are a domain master browser on the unicast subnet, do a query to the
+ WINS server for the *<1b> name. This will only work to a Samba WINS server,
+ so ignore it if we fail. If we succeed, contact each of the IP addresses in
+ turn and do a node status request to them. If this succeeds then look for a
+ <1b> name in the reply - this is the workgroup name. Add this to the unicast
+ subnet. This is expensive, so we only do this every 15 minutes.
+**************************************************************************/
+
+void collect_all_workgroup_names_from_wins_server(time_t t)
+{
+ static time_t lastrun = 0;
+ struct work_record *work;
+
+ /* Only do this if we are using a WINS server. */
+ if(we_are_a_wins_client() == False)
+ return;
+
+ /* Check to see if we are a domain master browser on the unicast subnet. */
+ if((work = find_workgroup_on_subnet( unicast_subnet, lp_workgroup())) == NULL) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "collect_all_workgroup_names_from_wins_server:\n" );
+ dbgtext( "Cannot find my workgroup %s ", lp_workgroup() );
+ dbgtext( "on subnet %s.\n", unicast_subnet->subnet_name );
+ }
+ return;
+ }
+
+ if(!AM_DOMAIN_MASTER_BROWSER(work))
+ return;
+
+ if ((lastrun != 0) && (t < lastrun + (15 * 60)))
+ return;
+
+ lastrun = t;
+
+ /* First, query for the *<1b> name from the WINS server. */
+ query_name(unicast_subnet, "*", 0x1b,
+ find_all_domain_master_names_query_success,
+ find_all_domain_master_names_query_fail,
+ NULL);
+}
+
+
+/****************************************************************************
+ If we are a domain master browser on the unicast subnet, do a regular sync
+ with all other DMBs that we know of on that subnet.
+
+To prevent exponential network traffic with large numbers of workgroups
+we use a randomised system where sync probability is inversely proportional
+to the number of known workgroups
+**************************************************************************/
+
+void sync_all_dmbs(time_t t)
+{
+ static time_t lastrun = 0;
+ struct work_record *work;
+ int count=0;
+
+ /* Only do this if we are using a WINS server. */
+ if(we_are_a_wins_client() == False)
+ return;
+
+ /* Check to see if we are a domain master browser on the
+ unicast subnet. */
+ work = find_workgroup_on_subnet(unicast_subnet, lp_workgroup());
+ if (!work)
+ return;
+
+ if (!AM_DOMAIN_MASTER_BROWSER(work))
+ return;
+
+ if ((lastrun != 0) && (t < lastrun + (5 * 60)))
+ return;
+
+ /* count how many syncs we might need to do */
+ for (work=unicast_subnet->workgrouplist; work; work = work->next) {
+ if (strcmp(lp_workgroup(), work->work_group)) {
+ count++;
+ }
+ }
+
+ /* sync with a probability of 1/count */
+ for (work=unicast_subnet->workgrouplist; work; work = work->next) {
+ if (strcmp(lp_workgroup(), work->work_group)) {
+ unstring dmb_name;
+
+ if (((unsigned)sys_random()) % count != 0)
+ continue;
+
+ lastrun = t;
+
+ if (!work->dmb_name.name[0]) {
+ /* we don't know the DMB - assume it is
+ the same as the unicast local master */
+ make_nmb_name(&work->dmb_name,
+ work->local_master_browser_name,
+ 0x20);
+ }
+
+ pull_ascii_nstring(dmb_name, sizeof(dmb_name), work->dmb_name.name);
+
+ DEBUG(3,("Initiating DMB<->DMB sync with %s(%s)\n",
+ dmb_name, inet_ntoa(work->dmb_addr)));
+
+ sync_browse_lists(work,
+ dmb_name,
+ work->dmb_name.name_type,
+ work->dmb_addr, False, False);
+ }
+ }
+}
projects / samba / blobdiff