dnscrypto-proxy: Support files updated.

[tomato.git] / release / src / router / samba3 / source / nmbd / nmbd_serverlistdb.c

/* 
   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"

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 = SMB_MALLOC_P(struct server_record)) == NULL) {
                DEBUG(0,("create_server_entry_on_workgroup: malloc fail !\n"));
                return NULL;
        }

        memset((char *)servrec,'\0',sizeof(*servrec));
 
        servrec->subnet = work->subnet;
 
        fstrcpy(servrec->serv.name,name);
        fstrcpy(servrec->serv.comment,comment);
        strupper_m(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 && (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_char(fname,'\0' ,'/');
        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));
}