first public release of samba4 code

(This used to be commit b0510b5428b3461aeb9bbe3cc95f62fc73e2b97f)

1 files changed, 396 insertions, 0 deletions

diff --git a/source4/nmbd/nmbd_become_dmb.c b/source4/nmbd/nmbd_become_dmb.c
new file mode 100644
index 0000000000..d8122777fe
--- /dev/null
+++ b/source4/nmbd/nmbd_become_dmb.c
@@ -0,0 +1,396 @@
+/* 
+   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"
+
+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)
+{
+  struct work_record *work = find_workgroup_on_subnet(subrec, fail_name->name);
+  struct server_record *servrec;
+
+  if(!work)
+  {
+    DEBUG(0,("become_domain_master_fail: Error - cannot find \
+workgroup %s on subnet %s\n", fail_name->name, subrec->subnet_name));
+    return;
+  }
+
+  /* Set the state back to DOMAIN_NONE. */
+  work->dom_state = DOMAIN_NONE;
+
+  if((servrec = find_server_in_workgroup( work, lp_netbios_name())) == NULL)
+  {
+    DEBUG(0,("become_domain_master_fail: Error - cannot find server %s \
+in workgroup %s on subnet %s\n",
+	     lp_netbios_name(), 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)
+{
+  struct work_record *work = find_workgroup_on_subnet( subrec, registered_name->name);
+  struct server_record *servrec;
+
+  if(!work)
+  {
+    DEBUG(0,("become_domain_master_stage2: Error - cannot find \
+workgroup %s on subnet %s\n", registered_name->name, subrec->subnet_name));
+    return;
+  }
+
+  if((servrec = find_server_in_workgroup( work, lp_netbios_name())) == NULL)
+  {
+    DEBUG(0,("become_domain_master_stage2: Error - cannot find server %s \
+in workgroup %s on subnet %s\n", 
+	     lp_netbios_name(), registered_name->name, 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 ", lp_netbios_name() );
+    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, lp_netbios_name(), 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, 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)
+{
+  /* 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, nmbname->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), nmbname->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)
+{
+  /* 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. */
+  become_domain_master_stage1(subrec, question_name->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, nmbname.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, nmbname.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_server_role() == ROLE_DOMAIN_PDC)
+  {
+    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());
+  }
+}