first public release of samba4 code

(This used to be commit b0510b5428b3461aeb9bbe3cc95f62fc73e2b97f)

1 files changed, 448 insertions, 0 deletions

diff --git a/source4/nmbd/nmbd_serverlistdb.c b/source4/nmbd/nmbd_serverlistdb.c
new file mode 100644
index 0000000000..ee0c021d5d
--- /dev/null
+++ b/source4/nmbd/nmbd_serverlistdb.c
@@ -0,0 +1,448 @@
+/* 
+   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 int ClientNMB;
+
+int updatecount = 0;
+
+/*******************************************************************
+  Remove all the servers in a work group.
+  ******************************************************************/
+
+void remove_all_servers(struct work_record *work)
+{
+  struct server_record *servrec;
+  struct server_record *nexts;
+
+  for (servrec = work->serverlist; servrec; servrec = nexts)
+  {
+    DEBUG(7,("remove_all_servers: Removing server %s\n",servrec->serv.name));
+    nexts = servrec->next;
+
+    if (servrec->prev)
+      servrec->prev->next = servrec->next;
+    if (servrec->next)
+      servrec->next->prev = servrec->prev;
+
+    if (work->serverlist == servrec)
+      work->serverlist = servrec->next;
+
+    ZERO_STRUCTP(servrec);
+    SAFE_FREE(servrec);
+
+  }
+
+  work->subnet->work_changed = True;
+}
+
+/***************************************************************************
+  Add a server into the a workgroup serverlist.
+  **************************************************************************/
+
+static void add_server_to_workgroup(struct work_record *work,
+                             struct server_record *servrec)
+{
+  struct server_record *servrec2;
+
+  if (!work->serverlist)
+  {
+    work->serverlist = servrec;
+    servrec->prev = NULL;
+    servrec->next = NULL;
+    return;
+  }
+
+  for (servrec2 = work->serverlist; servrec2->next; servrec2 = servrec2->next)
+    ;
+
+  servrec2->next = servrec;
+  servrec->next = NULL;
+  servrec->prev = servrec2;
+  work->subnet->work_changed = True;
+}
+
+/****************************************************************************
+  Find a server in a server list.
+  **************************************************************************/
+
+struct server_record *find_server_in_workgroup(struct work_record *work, const char *name)
+{
+  struct server_record *ret;
+  
+  for (ret = work->serverlist; ret; ret = ret->next)
+  {
+    if (strequal(ret->serv.name,name))
+      return ret;
+  }
+  return NULL;
+}
+
+
+/****************************************************************************
+  Remove a server entry from this workgroup.
+  ****************************************************************************/
+
+void remove_server_from_workgroup(struct work_record *work, struct server_record *servrec)
+{
+  if (servrec->prev)
+    servrec->prev->next = servrec->next;
+  if (servrec->next)
+    servrec->next->prev = servrec->prev;
+
+  if (work->serverlist == servrec) 
+    work->serverlist = servrec->next; 
+
+  ZERO_STRUCTP(servrec);
+  SAFE_FREE(servrec);
+  work->subnet->work_changed = True;
+}
+
+/****************************************************************************
+  Create a server entry on this workgroup.
+  ****************************************************************************/
+
+struct server_record *create_server_on_workgroup(struct work_record *work,
+                                                 const char *name,int servertype, 
+                                                 int ttl, const char *comment)
+{
+  struct server_record *servrec;
+  
+  if (name[0] == '*')
+  {
+      DEBUG(7,("create_server_on_workgroup: not adding name starting with '*' (%s)\n",
+             name));
+      return (NULL);
+  }
+  
+  if((servrec = find_server_in_workgroup(work, name)) != NULL)
+  {
+    DEBUG(0,("create_server_on_workgroup: Server %s already exists on \
+workgroup %s. This is a bug.\n", name, work->work_group));
+    return NULL;
+  }
+  
+  if((servrec = (struct server_record *)malloc(sizeof(*servrec))) == NULL)
+  {
+    DEBUG(0,("create_server_entry_on_workgroup: malloc fail !\n"));
+    return NULL;
+  }
+
+  memset((char *)servrec,'\0',sizeof(*servrec));
+ 
+  servrec->subnet = work->subnet;
+ 
+  StrnCpy(servrec->serv.name,name,sizeof(servrec->serv.name)-1);
+  StrnCpy(servrec->serv.comment,comment,sizeof(servrec->serv.comment)-1);
+  strupper(servrec->serv.name);
+  servrec->serv.type  = servertype;
+
+  update_server_ttl(servrec, ttl);
+  
+  add_server_to_workgroup(work, servrec);
+      
+  DEBUG(3,("create_server_on_workgroup: Created server entry %s of type %x (%s) on \
+workgroup %s.\n", name,servertype,comment, work->work_group));
+ 
+  work->subnet->work_changed = True;
+ 
+  return(servrec);
+}
+
+/*******************************************************************
+ Update the ttl field of a server record.
+*******************************************************************/
+
+void update_server_ttl(struct server_record *servrec, int ttl)
+{
+  if(ttl > lp_max_ttl())
+    ttl = lp_max_ttl();
+
+  if(is_myname(servrec->serv.name))
+    servrec->death_time = PERMANENT_TTL;
+  else
+    servrec->death_time = (ttl != PERMANENT_TTL) ? time(NULL)+(ttl*3) : PERMANENT_TTL;
+
+  servrec->subnet->work_changed = True;
+}
+
+/*******************************************************************
+  Expire old servers in the serverlist. A time of -1 indicates 
+  everybody dies except those with a death_time of PERMANENT_TTL (which is 0).
+  This should only be called from expire_workgroups_and_servers().
+  ******************************************************************/
+
+void expire_servers(struct work_record *work, time_t t)
+{
+  struct server_record *servrec;
+  struct server_record *nexts;
+  
+  for (servrec = work->serverlist; servrec; servrec = nexts)
+  {
+    nexts = servrec->next;
+
+    if ((servrec->death_time != PERMANENT_TTL) && ((t == -1) || (servrec->death_time < t)))
+    {
+      DEBUG(3,("expire_old_servers: Removing timed out server %s\n",servrec->serv.name));
+      remove_server_from_workgroup(work, servrec);
+      work->subnet->work_changed = True;
+    }
+  }
+}
+
+/*******************************************************************
+ Decide if we should write out a server record for this server.
+ We return zero if we should not. Check if we've already written
+ out this server record from an earlier subnet.
+******************************************************************/
+
+static uint32 write_this_server_name( struct subnet_record *subrec,
+                                      struct work_record *work,
+                                      struct server_record *servrec)
+{
+  struct subnet_record *ssub;
+  struct work_record *iwork;
+
+  /* Go through all the subnets we have already seen. */
+  for (ssub = FIRST_SUBNET; ssub != subrec; ssub = NEXT_SUBNET_INCLUDING_UNICAST(ssub)) 
+  {
+    for(iwork = ssub->workgrouplist; iwork; iwork = iwork->next)
+    {
+      if(find_server_in_workgroup( iwork, servrec->serv.name) != NULL)
+      {
+        /*
+         * We have already written out this server record, don't
+         * do it again. This gives precedence to servers we have seen
+         * on the broadcast subnets over servers that may have been
+         * added via a sync on the unicast_subet.
+         *
+         * The correct way to do this is to have a serverlist file
+         * per subnet - this means changes to smbd as well. I may
+         * add this at a later date (JRA).
+         */
+
+        return 0;
+      }
+    }
+  }
+
+  return servrec->serv.type;
+}
+
+/*******************************************************************
+ Decide if we should write out a workgroup record for this workgroup.
+ We return zero if we should not. Don't write out lp_workgroup() (we've
+ already done it) and also don't write out a second workgroup record
+ on the unicast subnet that we've already written out on one of the
+ broadcast subnets.
+******************************************************************/
+
+static uint32 write_this_workgroup_name( struct subnet_record *subrec, 
+                                         struct work_record *work)
+{
+  struct subnet_record *ssub;
+
+  if(strequal(lp_workgroup(), work->work_group))
+    return 0;
+
+  /* This is a workgroup we have seen on a broadcast subnet. All
+     these have the same type. */
+
+  if(subrec != unicast_subnet)
+    return (SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT|SV_TYPE_LOCAL_LIST_ONLY);
+
+  for(ssub = FIRST_SUBNET; ssub;  ssub = NEXT_SUBNET_EXCLUDING_UNICAST(ssub))
+  {
+    /* This is the unicast subnet so check if we've already written out
+       this subnet when we passed over the broadcast subnets. */
+
+    if(find_workgroup_on_subnet( ssub, work->work_group) != NULL)
+      return 0;
+  }
+
+  /* All workgroups on the unicast subnet (except our own, which we
+     have already written out) cannot be local. */
+
+  return (SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT);
+}
+
+/*******************************************************************
+  Write out the browse.dat file.
+  ******************************************************************/
+
+void write_browse_list_entry(XFILE *fp, const char *name, uint32 rec_type,
+		const char *local_master_browser_name, const char *description)
+{
+	fstring tmp;
+
+	slprintf(tmp,sizeof(tmp)-1, "\"%s\"", name);
+	x_fprintf(fp, "%-25s ", tmp);
+	x_fprintf(fp, "%08x ", rec_type);
+	slprintf(tmp, sizeof(tmp)-1, "\"%s\" ", local_master_browser_name);
+	x_fprintf(fp, "%-30s", tmp);
+	x_fprintf(fp, "\"%s\"\n", description);
+}
+
+void write_browse_list(time_t t, BOOL force_write)
+{   
+  struct subnet_record *subrec;
+  struct work_record *work;
+  struct server_record *servrec;
+  pstring fname,fnamenew;
+  uint32 stype;
+  int i;
+  XFILE *fp;
+  BOOL list_changed = force_write;
+  static time_t lasttime = 0;
+    
+  /* Always dump if we're being told to by a signal. */
+  if(force_write == False)
+  {
+    if (!lasttime)
+      lasttime = t;
+    if (t - lasttime < 5)
+      return;
+  }
+
+  lasttime = t;
+
+  dump_workgroups(force_write);
+ 
+  for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
+  {
+    if(subrec->work_changed)
+    {
+      list_changed = True;
+      break;
+    }
+  }
+
+  if(!list_changed)
+    return;
+
+  updatecount++;
+    
+  pstrcpy(fname,lp_lockdir());
+  trim_string(fname,NULL,"/");
+  pstrcat(fname,"/");
+  pstrcat(fname,SERVER_LIST);
+  pstrcpy(fnamenew,fname);
+  pstrcat(fnamenew,".");
+ 
+  fp = x_fopen(fnamenew,O_WRONLY|O_CREAT|O_TRUNC, 0644);
+ 
+  if (!fp)
+  {
+    DEBUG(0,("write_browse_list: Can't open file %s. Error was %s\n",
+              fnamenew,strerror(errno)));
+    return;
+  } 
+  
+  /*
+   * Write out a record for our workgroup. Use the record from the first
+   * subnet.
+   */
+
+  if((work = find_workgroup_on_subnet(FIRST_SUBNET, lp_workgroup())) == NULL)
+  { 
+    DEBUG(0,("write_browse_list: Fatal error - cannot find my workgroup %s\n",
+             lp_workgroup()));
+    x_fclose(fp);
+    return;
+  }
+
+  write_browse_list_entry(fp, work->work_group,
+     SV_TYPE_DOMAIN_ENUM|SV_TYPE_NT|SV_TYPE_LOCAL_LIST_ONLY,
+     work->local_master_browser_name, work->work_group);
+
+  /* 
+   * We need to do something special for our own names.
+   * This is due to the fact that we may be a local master browser on
+   * one of our broadcast subnets, and a domain master on the unicast
+   * subnet. We iterate over the subnets and only write out the name
+   * once.
+   */
+
+  for (i=0; my_netbios_names(i); i++)
+  {
+    stype = 0;
+    for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec))
+    {
+      if((work = find_workgroup_on_subnet( subrec, lp_workgroup() )) == NULL)
+        continue;
+      if((servrec = find_server_in_workgroup( work, my_netbios_names(i))) == NULL)
+        continue;
+
+      stype |= servrec->serv.type;
+    }
+
+    /* Output server details, plus what workgroup they're in. */
+    write_browse_list_entry(fp, my_netbios_names(i), stype,
+        string_truncate(lp_serverstring(), MAX_SERVER_STRING_LENGTH), lp_workgroup());
+  }
+      
+  for (subrec = FIRST_SUBNET; subrec ; subrec = NEXT_SUBNET_INCLUDING_UNICAST(subrec)) 
+  { 
+    subrec->work_changed = False;
+
+    for (work = subrec->workgrouplist; work ; work = work->next)
+    {
+      /* Write out a workgroup record for a workgroup. */
+      uint32 wg_type = write_this_workgroup_name( subrec, work);
+
+      if(wg_type)
+      {
+        write_browse_list_entry(fp, work->work_group, wg_type,
+                                work->local_master_browser_name,
+                                work->work_group);
+      }
+
+      /* Now write out any server records a workgroup may have. */
+
+      for (servrec = work->serverlist; servrec ; servrec = servrec->next)
+      {
+        uint32 serv_type;
+
+        /* We have already written our names here. */
+        if(is_myname(servrec->serv.name))
+          continue; 
+
+        serv_type = write_this_server_name(subrec, work, servrec);
+
+        if(serv_type)
+        {
+          /* Output server details, plus what workgroup they're in. */
+          write_browse_list_entry(fp, servrec->serv.name, serv_type,
+                                 servrec->serv.comment, work->work_group);
+        }
+      }
+    }
+  } 
+  
+  x_fclose(fp);
+  unlink(fname);
+  chmod(fnamenew,0644);
+  rename(fnamenew,fname);
+  DEBUG(3,("write_browse_list: Wrote browse list into file %s\n",fname));
+}