--- /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"
+
+extern struct in_addr allones_ip;
+
+extern uint16 samba_nb_type; /* Samba's NetBIOS type. */
+
+static void become_domain_master_browser_bcast(const char *);
+
+/****************************************************************************
+ Fail to become a Domain Master Browser on a subnet.
+ ****************************************************************************/
+
+static void become_domain_master_fail(struct subnet_record *subrec,
+ struct response_record *rrec,
+ struct nmb_name *fail_name)
+{
+ unstring failname;
+ struct work_record *work;
+ struct server_record *servrec;
+
+ pull_ascii_nstring(failname, sizeof(failname), fail_name->name);
+ work = find_workgroup_on_subnet(subrec, failname);
+ if(!work) {
+ DEBUG(0,("become_domain_master_fail: Error - cannot find \
+workgroup %s on subnet %s\n", failname, subrec->subnet_name));
+ return;
+ }
+
+ /* Set the state back to DOMAIN_NONE. */
+ work->dom_state = DOMAIN_NONE;
+
+ if((servrec = find_server_in_workgroup( work, global_myname())) == NULL) {
+ DEBUG(0,("become_domain_master_fail: Error - cannot find server %s \
+in workgroup %s on subnet %s\n",
+ global_myname(), work->work_group, subrec->subnet_name));
+ return;
+ }
+
+ /* Update our server status. */
+ servrec->serv.type &= ~SV_TYPE_DOMAIN_MASTER;
+
+ /* Tell the namelist writer to write out a change. */
+ subrec->work_changed = True;
+
+ DEBUG(0,("become_domain_master_fail: Failed to become a domain master browser for \
+workgroup %s on subnet %s. Couldn't register name %s.\n",
+ work->work_group, subrec->subnet_name, nmb_namestr(fail_name)));
+}
+
+/****************************************************************************
+ Become a Domain Master Browser on a subnet.
+ ****************************************************************************/
+
+static void become_domain_master_stage2(struct subnet_record *subrec,
+ struct userdata_struct *userdata,
+ struct nmb_name *registered_name,
+ uint16 nb_flags,
+ int ttl, struct in_addr registered_ip)
+{
+ unstring regname;
+ struct work_record *work;
+ struct server_record *servrec;
+
+ pull_ascii_nstring(regname, sizeof(regname), registered_name->name);
+ work = find_workgroup_on_subnet( subrec, regname);
+
+ if(!work) {
+ DEBUG(0,("become_domain_master_stage2: Error - cannot find \
+workgroup %s on subnet %s\n", regname, subrec->subnet_name));
+ return;
+ }
+
+ if((servrec = find_server_in_workgroup( work, global_myname())) == NULL) {
+ DEBUG(0,("become_domain_master_stage2: Error - cannot find server %s \
+in workgroup %s on subnet %s\n",
+ global_myname(), regname, subrec->subnet_name));
+ work->dom_state = DOMAIN_NONE;
+ return;
+ }
+
+ /* Set the state in the workgroup structure. */
+ work->dom_state = DOMAIN_MST; /* Become domain master. */
+
+ /* Update our server status. */
+ servrec->serv.type |= (SV_TYPE_NT|SV_TYPE_DOMAIN_MASTER);
+
+ /* Tell the namelist writer to write out a change. */
+ subrec->work_changed = True;
+
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "*****\n\nSamba server %s ", global_myname() );
+ dbgtext( "is now a domain master browser for " );
+ dbgtext( "workgroup %s ", work->work_group );
+ dbgtext( "on subnet %s\n\n*****\n", subrec->subnet_name );
+ }
+
+ if( subrec == unicast_subnet ) {
+ struct nmb_name nmbname;
+ struct in_addr my_first_ip;
+
+ /* Put our name and first IP address into the
+ workgroup struct as domain master browser. This
+ will stop us syncing with ourself if we are also
+ a local master browser. */
+
+ make_nmb_name(&nmbname, global_myname(), 0x20);
+
+ work->dmb_name = nmbname;
+ /* Pick the first interface ip address as the domain master browser ip. */
+ my_first_ip = *iface_n_ip(0);
+
+ putip((char *)&work->dmb_addr, &my_first_ip);
+
+ /* We successfully registered by unicast with the
+ WINS server. We now expect to become the domain
+ master on the local subnets. If this fails, it's
+ probably a 1.9.16p2 to 1.9.16p11 server's fault.
+
+ This is a configuration issue that should be addressed
+ by the network administrator - you shouldn't have
+ several machines configured as a domain master browser
+ for the same WINS scope (except if they are 1.9.17 or
+ greater, and you know what you're doing.
+
+ see docs/DOMAIN.txt.
+
+ */
+ become_domain_master_browser_bcast(work->work_group);
+ } else {
+ /*
+ * Now we are a domain master on a broadcast subnet, we need to add
+ * the WORKGROUP<1b> name to the unicast subnet so that we can answer
+ * unicast requests sent to this name. This bug wasn't found for a while
+ * as it is strange to have a DMB without using WINS. JRA.
+ */
+ insert_permanent_name_into_unicast(subrec, registered_name, nb_flags);
+ }
+}
+
+/****************************************************************************
+ Start the name registration process when becoming a Domain Master Browser
+ on a subnet.
+****************************************************************************/
+
+static void become_domain_master_stage1(struct subnet_record *subrec, const char *wg_name)
+{
+ struct work_record *work;
+
+ DEBUG(2,("become_domain_master_stage1: Becoming domain master browser for \
+workgroup %s on subnet %s\n", wg_name, subrec->subnet_name));
+
+ /* First, find the workgroup on the subnet. */
+ if((work = find_workgroup_on_subnet( subrec, wg_name )) == NULL) {
+ DEBUG(0,("become_domain_master_stage1: Error - unable to find workgroup %s on subnet %s.\n",
+ wg_name, subrec->subnet_name));
+ return;
+ }
+
+ DEBUG(3,("become_domain_master_stage1: go to first stage: register <1b> name\n"));
+ work->dom_state = DOMAIN_WAIT;
+
+ /* WORKGROUP<1b> is the domain master browser name. */
+ register_name(subrec, work->work_group,0x1b,samba_nb_type,
+ become_domain_master_stage2,
+ become_domain_master_fail, NULL);
+}
+
+/****************************************************************************
+ Function called when a query for a WORKGROUP<1b> name succeeds.
+ This is normally a fail condition as it means there is already
+ a domain master browser for a workgroup and we were trying to
+ become one.
+****************************************************************************/
+
+static void become_domain_master_query_success(struct subnet_record *subrec,
+ struct userdata_struct *userdata,
+ struct nmb_name *nmbname, struct in_addr ip,
+ struct res_rec *rrec)
+{
+ unstring name;
+ pull_ascii_nstring(name, sizeof(name), nmbname->name);
+
+ /* If the given ip is not ours, then we can't become a domain
+ controler as the name is already registered.
+ */
+
+ /* BUG note. Samba 1.9.16p11 servers seem to return the broadcast
+ address or zero ip for this query. Pretend this is ok. */
+
+ if(ismyip(ip) || ip_equal(allones_ip, ip) || is_zero_ip(ip)) {
+ if( DEBUGLVL( 3 ) ) {
+ dbgtext( "become_domain_master_query_success():\n" );
+ dbgtext( "Our address (%s) ", inet_ntoa(ip) );
+ dbgtext( "returned in query for name %s ", nmb_namestr(nmbname) );
+ dbgtext( "(domain master browser name) " );
+ dbgtext( "on subnet %s.\n", subrec->subnet_name );
+ dbgtext( "Continuing with domain master code.\n" );
+ }
+
+ become_domain_master_stage1(subrec, name);
+ } else {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "become_domain_master_query_success:\n" );
+ dbgtext( "There is already a domain master browser at " );
+ dbgtext( "IP %s for workgroup %s ", inet_ntoa(ip), name );
+ dbgtext( "registered on subnet %s.\n", subrec->subnet_name );
+ }
+ }
+}
+
+/****************************************************************************
+ Function called when a query for a WORKGROUP<1b> name fails.
+ This is normally a success condition as it then allows us to register
+ our own Domain Master Browser name.
+ ****************************************************************************/
+
+static void become_domain_master_query_fail(struct subnet_record *subrec,
+ struct response_record *rrec,
+ struct nmb_name *question_name, int fail_code)
+{
+ unstring name;
+
+ /* If the query was unicast, and the error is not NAM_ERR (name didn't exist),
+ then this is a failure. Otherwise, not finding the name is what we want. */
+
+ if((subrec == unicast_subnet) && (fail_code != NAM_ERR)) {
+ DEBUG(0,("become_domain_master_query_fail: Error %d returned when \
+querying WINS server for name %s.\n",
+ fail_code, nmb_namestr(question_name)));
+ return;
+ }
+
+ /* Otherwise - not having the name allows us to register it. */
+ pull_ascii_nstring(name, sizeof(name), question_name->name);
+ become_domain_master_stage1(subrec, name);
+}
+
+/****************************************************************************
+ Attempt to become a domain master browser on all broadcast subnets.
+ ****************************************************************************/
+
+static void become_domain_master_browser_bcast(const char *workgroup_name)
+{
+ struct subnet_record *subrec;
+
+ for (subrec = FIRST_SUBNET; subrec; subrec = NEXT_SUBNET_EXCLUDING_UNICAST(subrec)) {
+ struct work_record *work = find_workgroup_on_subnet(subrec, workgroup_name);
+
+ if (work && (work->dom_state == DOMAIN_NONE)) {
+ struct nmb_name nmbname;
+ make_nmb_name(&nmbname,workgroup_name,0x1b);
+
+ /*
+ * Check for our name on the given broadcast subnet first, only initiate
+ * further processing if we cannot find it.
+ */
+
+ if (find_name_on_subnet(subrec, &nmbname, FIND_SELF_NAME) == NULL) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "become_domain_master_browser_bcast:\n" );
+ dbgtext( "Attempting to become domain master browser on " );
+ dbgtext( "workgroup %s on subnet %s\n",
+ workgroup_name, subrec->subnet_name );
+ }
+
+ /* Send out a query to establish whether there's a
+ domain controller on the local subnet. If not,
+ we can become a domain controller.
+ */
+
+ DEBUG(0,("become_domain_master_browser_bcast: querying subnet %s \
+for domain master browser on workgroup %s\n", subrec->subnet_name, workgroup_name));
+
+ query_name(subrec, workgroup_name, nmbname.name_type,
+ become_domain_master_query_success,
+ become_domain_master_query_fail,
+ NULL);
+ }
+ }
+ }
+}
+
+/****************************************************************************
+ Attempt to become a domain master browser by registering with WINS.
+ ****************************************************************************/
+
+static void become_domain_master_browser_wins(const char *workgroup_name)
+{
+ struct work_record *work;
+
+ work = find_workgroup_on_subnet(unicast_subnet, workgroup_name);
+
+ if (work && (work->dom_state == DOMAIN_NONE)) {
+ struct nmb_name nmbname;
+
+ make_nmb_name(&nmbname,workgroup_name,0x1b);
+
+ /*
+ * Check for our name on the unicast subnet first, only initiate
+ * further processing if we cannot find it.
+ */
+
+ if (find_name_on_subnet(unicast_subnet, &nmbname, FIND_SELF_NAME) == NULL) {
+ if( DEBUGLVL( 0 ) ) {
+ dbgtext( "become_domain_master_browser_wins:\n" );
+ dbgtext( "Attempting to become domain master browser " );
+ dbgtext( "on workgroup %s, subnet %s.\n",
+ workgroup_name, unicast_subnet->subnet_name );
+ }
+
+ /* Send out a query to establish whether there's a
+ domain master broswer registered with WINS. If not,
+ we can become a domain master browser.
+ */
+
+ DEBUG(0,("become_domain_master_browser_wins: querying WINS server from IP %s \
+for domain master browser name %s on workgroup %s\n",
+ inet_ntoa(unicast_subnet->myip), nmb_namestr(&nmbname), workgroup_name));
+
+ query_name(unicast_subnet, workgroup_name, nmbname.name_type,
+ become_domain_master_query_success,
+ become_domain_master_query_fail,
+ NULL);
+ }
+ }
+}
+
+/****************************************************************************
+ Add the domain logon server and domain master browser names
+ if we are set up to do so.
+ **************************************************************************/
+
+void add_domain_names(time_t t)
+{
+ static time_t lastrun = 0;
+
+ if ((lastrun != 0) && (t < lastrun + (CHECK_TIME_ADD_DOM_NAMES * 60)))
+ return;
+
+ lastrun = t;
+
+ /* Do the "internet group" - <1c> names. */
+ if (lp_domain_logons())
+ add_logon_names();
+
+ /* Do the domain master names. */
+ if(lp_domain_master()) {
+ if(we_are_a_wins_client()) {
+ /* We register the WORKGROUP<1b> name with the WINS
+ server first, and call add_domain_master_bcast()
+ only if this is successful.
+
+ This results in domain logon services being gracefully provided,
+ as opposed to the aggressive nature of 1.9.16p2 to 1.9.16p11.
+ 1.9.16p2 to 1.9.16p11 - due to a bug in namelogon.c,
+ cannot provide domain master / domain logon services.
+ */
+ become_domain_master_browser_wins(lp_workgroup());
+ } else {
+ become_domain_master_browser_bcast(lp_workgroup());
+ }
+ }
+}
projects / samba / blobdiff