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Sourcecode: samba-doc-ja version File versions

nmbd_synclists.c

/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   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.
   
*/

/* this file handles asynchronous browse synchronisation requests. The
   requests are done by forking and putting the result in a file in the
   locks directory. We do it this way because we don't want nmbd to be
   blocked waiting for some server to respond on a TCP connection. This
   also allows us to have more than 1 sync going at once (tridge) */

#include "includes.h"
#include "smb.h"

struct sync_record {
      struct sync_record *next, *prev;
      fstring workgroup;
      fstring server;
      pstring fname;
      struct in_addr ip;
      pid_t pid;
};

/* a linked list of current sync connections */
static struct sync_record *syncs;

static FILE *fp;

/*******************************************************************
  This is the NetServerEnum callback.
  Note sname and comment are in UNIX codepage format.
  ******************************************************************/
static void callback(const char *sname, uint32 stype, 
                     const char *comment, void *state)
{
      pstring uname;
      pstring ucomment;

      dos_to_unix(uname, sname);
      dos_to_unix(ucomment, comment);
      fprintf(fp,"\"%s\" %08X \"%s\"\n", uname, stype, ucomment);
}

/*******************************************************************
  Synchronise browse lists with another browse server.
  Log in on the remote server's SMB port to their IPC$ service,
  do a NetServerEnum and record the results in fname
******************************************************************/
static void sync_child(char *name, int nm_type, 
                   char *workgroup,
                   struct in_addr ip, BOOL local, BOOL servers,
                   char *fname)
{
      extern fstring local_machine;
      char *unix_workgroup;
      static struct cli_state cli;
      uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
      struct nmb_name called, calling;

      /* W2K DMB's return empty browse lists on port 445. Use 139.
       * Patch from Andy Levine andyl@epicrealm.com.
       */

      if (!cli_initialise(&cli) || !cli_set_port(&cli, 139) || !cli_connect(&cli, name, &ip)) {
            return;
      }

      make_nmb_name(&calling, local_machine, 0x0);
      make_nmb_name(&called , name         , nm_type);

      if (!cli_session_request(&cli, &calling, &called))
      {
            cli_shutdown(&cli);
            return;
      }

      if (!cli_negprot(&cli)) {
            cli_shutdown(&cli);
            return;
      }

      if (!cli_session_setup(&cli, "", "", 1, "", 0, workgroup)) {
            cli_shutdown(&cli);
            return;
      }

      if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
            cli_shutdown(&cli);
            return;
      }

      /* All the cli_XX functions take UNIX character set. */
      unix_workgroup = cli.server_domain?cli.server_domain:workgroup;

      /* Fetch a workgroup list. */
      cli_NetServerEnum(&cli, unix_workgroup,
                    local_type|SV_TYPE_DOMAIN_ENUM, 
                    callback, NULL);
      
      /* Now fetch a server list. */
      if (servers) {
            cli_NetServerEnum(&cli, workgroup, 
                          local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
                          callback, NULL);
      }
      
      cli_shutdown(&cli);
}


/*******************************************************************
  initialise a browse sync with another browse server.  Log in on the
  remote server's SMB port to their IPC$ service, do a NetServerEnum
  and record the results
******************************************************************/
void sync_browse_lists(struct work_record *work,
                   char *name, int nm_type, 
                   struct in_addr ip, BOOL local, BOOL servers)
{
      struct sync_record *s;
      static int counter;

      START_PROFILE(sync_browse_lists);
      /* Check we're not trying to sync with ourselves. This can
         happen if we are a domain *and* a local master browser. */
      if (ismyip(ip)) {
done:
            END_PROFILE(sync_browse_lists);
            return;
      }

      s = (struct sync_record *)malloc(sizeof(*s));
      if (!s) goto done;

      ZERO_STRUCTP(s);
      
      fstrcpy(s->workgroup, work->work_group);
      fstrcpy(s->server, name);
      s->ip = ip;

      slprintf(s->fname, sizeof(pstring)-1,
             "%s/sync.%d", lp_lockdir(), counter++);
      all_string_sub(s->fname,"//", "/", 0);
      
      DLIST_ADD(syncs, s);

      /* the parent forks and returns, leaving the child to do the
         actual sync and call END_PROFILE*/
      CatchChild();
      if ((s->pid = sys_fork())) return;

      BlockSignals( False, SIGTERM );

      DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
             work->work_group, name, inet_ntoa(ip)));

      fp = sys_fopen(s->fname,"w");
      if (!fp) {
            END_PROFILE(sync_browse_lists);
            _exit(1);   
      }

      sync_child(name, nm_type, work->work_group, ip, local, servers,
               s->fname);

      fclose(fp);
      END_PROFILE(sync_browse_lists);
      _exit(0);
}

/**********************************************************************
handle one line from a completed sync file
 **********************************************************************/
static void complete_one(struct sync_record *s, 
                   char *sname, uint32 stype, char *comment)
{
      struct work_record *work;
      struct server_record *servrec;

      stype &= ~SV_TYPE_LOCAL_LIST_ONLY;

      if (stype & SV_TYPE_DOMAIN_ENUM) {
            /* See if we can find the workgroup on this subnet. */
            if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
                  /* We already know about this workgroup -
                           update the ttl. */
                  update_workgroup_ttl(work,lp_max_ttl());
            } else {
                  /* Create the workgroup on the subnet. */
                  work = create_workgroup_on_subnet(unicast_subnet, 
                                            sname, lp_max_ttl());
                  if (work) {
                        /* remember who the master is */
                        fstrcpy(work->local_master_browser_name, 
                              comment);
                  }
            }
            return;
      } 

      work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
      if (!work) {
            DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
                   s->workgroup));
            return;
      }

      if ((servrec = find_server_in_workgroup( work, sname))) {
            /* Check that this is not a locally known
               server - if so ignore the entry. */
            if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
                  /* We already know about this server - update
                           the ttl. */
                  update_server_ttl(servrec, lp_max_ttl());
                  /* Update the type. */
                  servrec->serv.type = stype;
            }
            return;
      } 

      /* Create the server in the workgroup. */ 
      create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
}
            

/**********************************************************************
read the completed sync info
 **********************************************************************/
static void complete_sync(struct sync_record *s)
{
      FILE *f;
      fstring server, type_str;
      unsigned type;
      pstring comment;
      pstring line, dos_line;
      const char *ptr;
      int count=0;

      f = sys_fopen(s->fname,"r");

      if (!f) return;
      
      while (!feof(f)) {
            
            if (!fgets_slash(line,sizeof(pstring),f)) continue;
            
            /* The line is written in UNIX character set. Convert to DOS codepage. */
            unix_to_dos(dos_line, line);
            ptr = dos_line;

            if (!next_token(&ptr,server,NULL,sizeof(server)) ||
                !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
                !next_token(&ptr,comment,NULL, sizeof(comment))) {
                  continue;
            }

            sscanf(type_str, "%X", &type);

            complete_one(s, server, type, comment);

            count++;
      }

      fclose(f);

      unlink(s->fname);

      DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
             s->server, inet_ntoa(s->ip), s->workgroup, count));
}

/**********************************************************************
check for completion of any of the child processes
 **********************************************************************/
void sync_check_completion(void)
{
      struct sync_record *s, *next;

      for (s=syncs;s;s=next) {
            next = s->next;
            if (!process_exists(s->pid)) {
                  /* it has completed - grab the info */
                  complete_sync(s);
                  DLIST_REMOVE(syncs, s);
                  ZERO_STRUCTP(s);
                  SAFE_FREE(s);
            }
      }
}

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