as a result of the writing of namework.doc, namework.c has been tidied up,

some bugs fixed / documented and some discrepancies noted down (in
namework.c as well as namework.doc)

namebrowse.c and namelogon.c contain functions that were inappropriately
placed in namework.c. namebrowse.c contains browse sync queue management
functions that were inappropriately placed in namedb.c

the 'cmd_type' member of response_record has been renamed to 'state'
because that more accurately reflects it purpose (not entirely. sigh).

fixed a bug in nameserv.c that meant the previous version wouldn't
compile.

there's probably a bit more...

lkcl
(This used to be commit a66417ebe871a1c1366c395ea4c7099852975e65)

1 files changed, 215 insertions, 0 deletions

diff --git a/source3/namebrowse.c b/source3/namebrowse.c
new file mode 100644
index 0000000000..31ee9347ec
--- /dev/null
+++ b/source3/namebrowse.c
@@ -0,0 +1,215 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   NBT netbios routines and daemon - version 2
+   Copyright (C) Andrew Tridgell 1994-1995
+   
+   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.
+   
+   Revision History:
+
+   14 jan 96: lkcl@pires.co.uk
+   added multiple workgroup domain master support
+
+*/
+
+#include "includes.h"
+#include "smb.h"
+
+extern int ClientNMB;
+
+extern int DEBUGLEVEL;
+
+/* this is our browse master/backup cache database */
+static struct browse_cache_record *browserlist = NULL;
+
+
+/***************************************************************************
+  add a browser into the list
+  **************************************************************************/
+static void add_browse_cache(struct browse_cache_record *b)
+{
+  struct browse_cache_record *b2;
+
+  if (!browserlist)
+    {
+      browserlist = b;
+      b->prev = NULL;
+      b->next = NULL;
+      return;
+    }
+  
+  for (b2 = browserlist; b2->next; b2 = b2->next) ;
+  
+  b2->next = b;
+  b->next = NULL;
+  b->prev = b2;
+}
+
+
+/*******************************************************************
+  remove old browse entries
+  ******************************************************************/
+void expire_browse_cache(time_t t)
+{
+  struct browse_cache_record *b;
+  struct browse_cache_record *nextb;
+  
+  /* expire old entries in the serverlist */
+  for (b = browserlist; b; b = nextb)
+    {
+      if (b->synced && b->sync_time < t)
+	{
+	  DEBUG(3,("Removing dead cached browser %s\n",b->name));
+	  nextb = b->next;
+	  
+	  if (b->prev) b->prev->next = b->next;
+	  if (b->next) b->next->prev = b->prev;
+	  
+	  if (browserlist == b) browserlist = b->next; 
+	  
+	  free(b);
+	}
+      else
+	{
+	  nextb = b->next;
+	}
+    }
+}
+
+
+/****************************************************************************
+  add a browser entry
+  ****************************************************************************/
+struct browse_cache_record *add_browser_entry(char *name, int type, char *wg,
+					      time_t ttl, struct in_addr ip)
+{
+  BOOL newentry=False;
+  
+  struct browse_cache_record *b;
+
+  /* search for the entry: if it's already in the cache, update that entry */
+  for (b = browserlist; b; b = b->next)
+    {
+      if (ip_equal(ip,b->ip) && strequal(b->group, wg)) break;
+    }
+  
+  if (b && b->synced)
+    {
+      /* entries get left in the cache for a while. this stops sync'ing too
+	 often if the network is large */
+      DEBUG(4, ("browser %s %s %s already sync'd at time %d\n",
+		b->name, b->group, inet_ntoa(b->ip), b->sync_time));
+      return NULL;
+    }
+  
+  if (!b)
+    {
+      newentry = True;
+      b = (struct browse_cache_record *)malloc(sizeof(*b));
+      
+      if (!b) return(NULL);
+      
+      bzero((char *)b,sizeof(*b));
+    }
+  
+  /* update the entry */
+  ttl = time(NULL)+ttl;
+  
+  StrnCpy(b->name ,name,sizeof(b->name )-1);
+  StrnCpy(b->group,wg  ,sizeof(b->group)-1);
+  strupper(b->name);
+  strupper(b->group);
+  
+  b->ip     = ip;
+  b->type   = type;
+  
+  if (newentry || ttl < b->sync_time) 
+    b->sync_time = ttl;
+  
+  if (newentry)
+    {
+      b->synced = False;
+      add_browse_cache(b);
+      
+      DEBUG(3,("Added cache entry %s %s(%2x) %s ttl %d\n",
+	       wg, name, type, inet_ntoa(ip),ttl));
+    }
+  else
+    {
+      DEBUG(3,("Updated cache entry %s %s(%2x) %s ttl %d\n",
+	       wg, name, type, inet_ntoa(ip),ttl));
+    }
+  
+  return(b);
+}
+
+
+/****************************************************************************
+find a server responsible for a workgroup, and sync browse lists
+**************************************************************************/
+static void start_sync_browse_entry(struct browse_cache_record *b)
+{                     
+  struct subnet_record *d;
+  struct work_record *work;
+
+  if (!(d = find_subnet(b->ip))) return;
+
+  /* only sync if we are the master */
+  if (AM_MASTER(work)) {
+
+      /* first check whether the group we intend to sync with exists. if it
+         doesn't, the server must have died. o dear. */
+
+      /* see response_netbios_packet() or expire_netbios_response_entries() */
+      queue_netbios_packet(d,ClientNMB,NMB_QUERY,NAME_QUERY_SYNC,
+					   b->group,0x20,0,0,
+					   False,False,b->ip);
+  }
+
+  b->synced = True;
+}
+
+
+/****************************************************************************
+  search through browser list for an entry to sync with
+  **************************************************************************/
+void do_browser_lists(void)
+{
+  struct browse_cache_record *b;
+  static time_t last = 0;
+  time_t t = time(NULL);
+  
+  if (t-last < 20) return; /* don't do too many of these at once! */
+                           /* XXXX equally this period should not be too long
+                              the server may die in the intervening gap */
+  
+  last = t;
+  
+  /* pick any entry in the list, preferably one whose time is up */
+  for (b = browserlist; b && b->next; b = b->next)
+    {
+      if (b->sync_time < t && b->synced == False) break;
+    }
+  
+  if (b && !b->synced)
+  {
+    /* sync with the selected entry then remove some dead entries */
+    start_sync_browse_entry(b);
+    expire_browse_cache(t - 60);
+  }
+
+}
+