samba-mirror/source/nameannounce.c

/* 
   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"

#define TEST_CODE

extern int DEBUGLEVEL;
extern BOOL CanRecurse;

extern struct in_addr ipzero;

extern pstring myname;

extern int ClientDGRAM;
extern int ClientNMB;

/* this is our domain/workgroup/server database */
extern struct subnet_record *subnetlist;

/* machine comment for host announcements */
extern  pstring ServerComment;

extern int  updatecount;
extern int  workgroup_count;

extern struct in_addr ipgrp;

/****************************************************************************
  send a announce request to the local net
  **************************************************************************/
void announce_request(struct work_record *work, struct in_addr ip)
{
  pstring outbuf;
  char *p;

  if (!work) return;

  work->needannounce = True;

  DEBUG(2,("sending announce request to %s for workgroup %s\n",
	   inet_ntoa(ip),work->work_group));

  bzero(outbuf,sizeof(outbuf));
  p = outbuf;
  CVAL(p,0) = ANN_AnnouncementRequest;
  p++;

  CVAL(p,0) = work->token; /* (local) unique workgroup token id */
  p++;
  StrnCpy(p,myname,16);
  strupper(p);
  p = skip_string(p,1);
  
  /* XXXX note: if we sent the announcement request to 0x1d instead
     of 0x1e, then we could get the master browser to announce to
     us instead of the members of the workgroup. wha-hey! */

  send_mailslot_reply(BROWSE_MAILSLOT,ClientDGRAM,outbuf,PTR_DIFF(p,outbuf),
		      myname,work->work_group,0x20,0x1e,ip,*iface_ip(ip));
}


/****************************************************************************
  request an announcement
  **************************************************************************/
void do_announce_request(char *info, char *to_name, int announce_type, 
			 int from,
			 int to, struct in_addr dest_ip)
{
  pstring outbuf;
  char *p;
  
  bzero(outbuf,sizeof(outbuf));
  p = outbuf;
  CVAL(p,0) = announce_type; 
  p++;
  
  DEBUG(2,("sending announce type %d: info %s to %s - server %s(%x)\n",
	   announce_type, info, inet_ntoa(dest_ip),to_name,to));
  
  StrnCpy(p,info,16);
  strupper(p);
  p = skip_string(p,1);
  
  send_mailslot_reply(BROWSE_MAILSLOT,ClientDGRAM,outbuf,PTR_DIFF(p,outbuf),
		      myname,to_name,from,to,dest_ip,*iface_ip(dest_ip));
}


/****************************************************************************
  find a server responsible for a workgroup, and sync browse lists
  control ends up back here via response_name_query.
  **************************************************************************/
void sync_server(enum state_type state, char *serv_name, char *work_name, 
		 int name_type,
		 struct in_addr ip)
{                     
  add_browser_entry(serv_name, name_type, work_name, 0, ip);

  if (state == NAME_STATUS_PDC_SRV_CHK)
  {
    /* announce ourselves as a master browser to serv_name */
    do_announce_request(myname, serv_name, ANN_MasterAnnouncement,
			  0x20, 0, ip);
  }
}


/****************************************************************************
  construct a host announcement unicast

  this function should not be used heavily, and only when we are _not_
  a master browser and _not_ a primary domain controller.

  **************************************************************************/
void announce_backup(void)
{
  static time_t lastrun = 0;
  time_t t = time(NULL);
  pstring outbuf;
  char *p;
  struct subnet_record *d1;
  int tok;
  static uint32 id_count = 0;
  
  if (!lastrun) lastrun = t;
#if 1
  if (t < lastrun + 1 * 60)
#else
  if (t < lastrun + CHECK_TIME_ANNOUNCE_BACKUP * 60)
#endif
	return;
  lastrun = t;
  
  DEBUG(4,("checking backups...\n"));

  for (tok = 0; tok <= workgroup_count; tok++)
    {
      for (d1 = subnetlist; d1; d1 = d1->next)
	{
	  struct work_record *work;
	  struct subnet_record *d;
	  
	  /* search for unique workgroup: only the name matters */
	  for (work = d1->workgrouplist;
	       work && (tok != work->token);
	       work = work->next);
	  
	  if (!work) continue;

      if (AM_MASTER(work) && AM_DOMCTL(work)) continue;

	  /* found one: announce it across all domains */
	  for (d = subnetlist; d; d = d->next)
	    {
	      
	      DEBUG(2,("sending announce backup %s workgroup %s(%d)\n",
		       inet_ntoa(d->bcast_ip),work->work_group,
		       work->token));
	      
	      bzero(outbuf,sizeof(outbuf));
	      p = outbuf;

	      CVAL(p,0) = ANN_GetBackupListReq;
	      CVAL(p,1) = work->token; /* workgroup unique key index */
	      SIVAL(p,2,++id_count); /* unique count. not that we use it! */

	      p += 6;
	      
          debug_browse_data(outbuf, PTR_DIFF(p,outbuf));

	      if (!AM_DOMCTL(work))
          {
            /* only ask for a list of backup domain controllers
               if we are not a domain controller ourselves */
			
	      	send_mailslot_reply(BROWSE_MAILSLOT,
				  ClientDGRAM,outbuf,
				  PTR_DIFF(p,outbuf),
				  myname, work->work_group,
				  0x0,0x1b,d->bcast_ip,
				  *iface_ip(d->bcast_ip));
          }

          debug_browse_data(outbuf, PTR_DIFF(p,outbuf));

	      if (!AM_MASTER(work))
          {
            /* only ask for a list of master browsers if we
               are not a master browser ourselves */

	      	send_mailslot_reply(BROWSE_MAILSLOT,
				  ClientDGRAM,outbuf,
				  PTR_DIFF(p,outbuf),
				  myname, work->work_group,
				  0x0,0x1d,d->bcast_ip,
				  *iface_ip(d->bcast_ip));
          }
	    }
	}
    }
}


/****************************************************************************
  send a host announcement packet
  **************************************************************************/
static void do_announce_host(int command,
		char *from_name, int from_type, struct in_addr from_ip,
		char *to_name  , int to_type  , struct in_addr to_ip,
		time_t announce_interval,
		char *server_name, int server_type, char *server_comment)
{
	pstring outbuf;
	char *p;

	bzero(outbuf,sizeof(outbuf));
	p = outbuf+1;

	/* command type */
	CVAL(outbuf,0) = command;

	/* announcement parameters */
	CVAL(p,0) = updatecount;
	SIVAL(p,1,announce_interval*1000); /* ms - despite the spec */

	StrnCpy(p+5,server_name,16);
	strupper(p+5);

	CVAL(p,21) = 0x02; /* major version */
	CVAL(p,22) = 0x02; /* minor version */

	SIVAL(p,23,server_type);
	SSVAL(p,27,0x010f); /* browse version: got from NT/AS 4.00 */
	SSVAL(p,29,0xaa55); /* browse signature */

	strcpy(p+31,server_comment);
	p += 31;
	p = skip_string(p,1);

    debug_browse_data(outbuf, PTR_DIFF(p,outbuf));

	/* send the announcement */
	send_mailslot_reply(BROWSE_MAILSLOT,ClientDGRAM,outbuf,
					  PTR_DIFF(p,outbuf),
					  from_name, to_name,
					  from_type, to_type,
					  to_ip, from_ip);
}


/****************************************************************************
  remove all samba's server entries
  ****************************************************************************/
void remove_my_servers(void)
{
	struct subnet_record *d; 
	for (d = subnetlist; d; d = d->next)
	{
		struct work_record *work;
		for (work = d->workgrouplist; work; work = work->next)
		{
			struct server_record *s;
			for (s = work->serverlist; s; s = s->next)
			{
				if (!strequal(myname,s->serv.name)) continue;
				announce_server(d, work, s->serv.name, s->serv.comment, 0, 0);
			}
		}
	}
}


/****************************************************************************
  announce a server entry
  ****************************************************************************/
void announce_server(struct subnet_record *d, struct work_record *work,
					char *name, char *comment, time_t ttl, int server_type)
{
	uint32 domain_type = SV_TYPE_DOMAIN_ENUM|SV_TYPE_SERVER_UNIX;

	if (AM_MASTER(work))
	{
		DEBUG(3,("sending local master announce to %s for %s(1e)\n",
						inet_ntoa(d->bcast_ip),work->work_group));

		do_announce_host(ANN_LocalMasterAnnouncement,
						name            , 0x00, d->myip,
						work->work_group, 0x1e, d->bcast_ip,
						ttl*1000,
						name, server_type, comment);

		DEBUG(3,("sending domain announce to %s for %s\n",
						inet_ntoa(d->bcast_ip),work->work_group));

		/* XXXX should we do a domain-announce-kill? */
		if (server_type != 0)
		{
			if (AM_DOMCTL(work)) {
				domain_type |= SV_TYPE_DOMAIN_CTRL;
			}
			do_announce_host(ANN_DomainAnnouncement,
						name    , 0x00, d->myip,
						MSBROWSE, 0x01, d->bcast_ip,
						ttl*1000,
						work->work_group, server_type ? domain_type : 0,
						comment);
		}
	}
	else
	{
		DEBUG(3,("sending host announce to %s for %s(1d)\n",
						inet_ntoa(d->bcast_ip),work->work_group));

		do_announce_host(ANN_HostAnnouncement,
						name            , 0x00, d->myip,
						work->work_group, 0x1d, d->bcast_ip,
						ttl*1000,
						name, server_type, comment);
	}
}

/****************************************************************************
  construct a host announcement unicast
  **************************************************************************/
void announce_host(void)
{
  time_t t = time(NULL);
  struct subnet_record *d;
  pstring comment;
  char *my_name;

  StrnCpy(comment, *ServerComment ? ServerComment : "NoComment", 43);

  my_name = *myname ? myname : "NoName";

  for (d = subnetlist; d; d = d->next)
    {
      struct work_record *work;
      
      if (ip_equal(d->bcast_ip, ipgrp)) continue;

      for (work = d->workgrouplist; work; work = work->next)
	{
	  uint32 stype = work->ServerType;
	  struct server_record *s;
	  BOOL announce = False;
	  
      /* must work on the code that does announcements at up to
         30 seconds later if a master browser sends us a request
         announce.
       */

	  if (work->needannounce) {
	    /* drop back to a max 3 minute announce - this is to prevent a
	       single lost packet from stuffing things up for too long */
	    work->announce_interval = MIN(work->announce_interval,
						CHECK_TIME_MIN_HOST_ANNCE*60);
	    work->lastannounce_time = t - (work->announce_interval+1);
	  }
	  
	  /* announce every minute at first then progress to every 12 mins */
	  if (work->lastannounce_time && 
	      (t - work->lastannounce_time) < work->announce_interval)
	    continue;
	  
	  if (work->announce_interval < CHECK_TIME_MAX_HOST_ANNCE * 60) 
	    work->announce_interval += 60;
	  
	  work->lastannounce_time = t;

	  if (!d->my_interface) {
	    stype &= ~(SV_TYPE_POTENTIAL_BROWSER | SV_TYPE_MASTER_BROWSER |
		       SV_TYPE_DOMAIN_MASTER | SV_TYPE_BACKUP_BROWSER |
		       SV_TYPE_DOMAIN_CTRL | SV_TYPE_DOMAIN_MEMBER);
	  }

	  for (s = work->serverlist; s; s = s->next) {
	    if (strequal(myname, s->serv.name)) { 
	      announce = True; 
	      break; 
	    }
	  }
	  
	  if (announce)
	  {
		announce_server(d,work,my_name,comment,work->announce_interval,stype);
	  }
	  
	  if (work->needannounce)
	  {
	      work->needannounce = False;
	      break;
	      /* sorry: can't do too many announces. do some more later */
	  }
	}
  }
}


/****************************************************************************
  announce myself as a master to all other primary domain conrollers.

  BIG NOTE: this code will remain untested until some kind soul that has access
  to a couple of windows NT advanced servers runs this version of nmbd for at
  least 15 minutes.
  
  this actually gets done in search_and_sync_workgroups() via the
  NAME_QUERY_PDC_SRV_CHK command, if there is a response from the
  name query initiated here.  see response_name_query()
  **************************************************************************/
void announce_master(void)
{
  struct subnet_record *d;
  static time_t last=0;
  time_t t = time(NULL);
  BOOL am_master = False; /* are we a master of some sort? :-) */

  if (!last) last = t;
  if (t-last < CHECK_TIME_MST_ANNOUNCE * 60)
	return;

  last = t;

  for (d = subnetlist; d; d = d->next)
    {
      struct work_record *work;
      for (work = d->workgrouplist; work; work = work->next)
	{
	  if (AM_MASTER(work))
	    {
	      am_master = True;
	    }
	}
    }
  
  if (!am_master) return; /* only proceed if we are a master browser */
  
  for (d = subnetlist; d; d = d->next)
    {
      struct work_record *work;
      for (work = d->workgrouplist; work; work = work->next)
	{
	  struct server_record *s;
	  for (s = work->serverlist; s; s = s->next)
	    {
	      if (strequal(s->serv.name, myname)) continue;
	      
	      /* all PDCs (which should also be master browsers) */
	      if (s->serv.type & SV_TYPE_DOMAIN_CTRL)
		{
		  /* check the existence of a pdc for this workgroup, and if
		     one exists at the specified ip, sync with it and announce
		     ourselves as a master browser to it */
		  
		  if (!*lp_domain_controller() ||
		      !strequal(lp_domain_controller(), s->serv.name))
		    {
		      if (!lp_wins_support() && *lp_wins_server())
			{
			  struct in_addr ip;
			  ip = ipzero;
			  
			  queue_netbios_pkt_wins(d,ClientNMB,NMB_QUERY,
						 NAME_QUERY_PDC_SRV_CHK,
						 work->work_group,0x1b,0,0,
						 False, False, ip, ip);
			}
		      else
			{
			  struct subnet_record *d2;
			  for (d2 = subnetlist; d2; d2 = d2->next)
			    {
			      queue_netbios_packet(d,ClientNMB,NMB_QUERY,
						   NAME_QUERY_PDC_SRV_CHK,
						   work->work_group,0x1b,0,0,
						   True, False, d2->bcast_ip, d2->bcast_ip);
			    }
			}
		    }
		}
	    }
	  
	  /* now do primary domain controller - the one that's not
	     necessarily in our browse lists, although it ought to be
	     this pdc is the one that we get TOLD about through smb.conf.
	     basically, if it's on a subnet that we know about, it may end
	     up in our browse lists (which is why it's explicitly excluded
	     in the code above) */
	  
	  if (*lp_domain_controller())
	    {
	      struct in_addr ip;
	      BOOL bcast = False;
	      
	      ip = *interpret_addr2(lp_domain_controller());
	      
	      if (zero_ip(ip)) {
		ip = d->bcast_ip;
		bcast = True;
	      }

	      DEBUG(2, ("Searching for PDC %s at %s\n",
			lp_domain_controller(), inet_ntoa(ip)));
	      
	      /* check the existence of a pdc for this workgroup, and if
		 one exists at the specified ip, sync with it and announce
		 ourselves as a master browser to it */
	      queue_netbios_pkt_wins(d,ClientNMB, NMB_QUERY,NAME_QUERY_PDC_SRV_CHK,
				     work->work_group,0x1b, 0, 0,
				     bcast, False, ip, ip);
	    }
	}
    }
}