source/namedbserver.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios routines and daemon - version 2
   5    Copyright (C) Andrew Tridgell 1994-1997
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21    Revision History:
  22
  23    14 jan 96: lkcl@pires.co.uk
  24    added multiple workgroup domain master support
  25
  26    04 jul 96: lkcl@pires.co.uk
  27    created module namedbserver containing server database functions
  28
  29 */
  30
  31 #include "includes.h"
  32 #include "smb.h"
  33
  34 extern int ClientNMB;
  35 extern int ClientDGRAM;
  36
  37 extern int DEBUGLEVEL;
  38
  39 extern pstring myname;
  40
  41 /* this is our domain/workgroup/server database */
  42 extern struct subnet_record *subnetlist;
  43
  44 extern BOOL updatedlists;
  45
  46
  47 /*******************************************************************
  48   expire old servers in the serverlist
  49   time of -1 indicates everybody dies except those with time of 0
  50   remove_all_servers indicates everybody dies.
  51   ******************************************************************/
  52 void remove_old_servers(struct work_record *work, time_t t,
  53                                         BOOL remove_all)
  54 {
  55   struct server_record *s;
  56   struct server_record *nexts;
  57
  58   /* expire old entries in the serverlist */
  59   for (s = work->serverlist; s; s = nexts)
  60     {
  61       if (remove_all || (s->death_time && (t == -1 || s->death_time < t)))
  62         {
  63           DEBUG(3,("Removing dead server %s\n",s->serv.name));
  64           updatedlists = True;
  65           nexts = s->next;
  66
  67           if (s->prev) s->prev->next = s->next;
  68           if (s->next) s->next->prev = s->prev;
  69
  70           if (work->serverlist == s)
  71             work->serverlist = s->next;
  72
  73           free(s);
  74         }
  75       else
  76         {
  77           nexts = s->next;
  78         }
  79     }
  80 }
  81
  82
  83 /***************************************************************************
  84   add a server into the list
  85   **************************************************************************/
  86 static void add_server(struct work_record *work,struct server_record *s)
  87 {
  88   struct server_record *s2;
  89
  90   if (!work->serverlist) {
  91     work->serverlist = s;
  92     s->prev = NULL;
  93     s->next = NULL;
  94     return;
  95   }
  96
  97   for (s2 = work->serverlist; s2->next; s2 = s2->next) ;
  98
  99   s2->next = s;
 100   s->next = NULL;
 101   s->prev = s2;
 102 }
 103
 104
 105 /****************************************************************************
 106   find a server in a server list.
 107   **************************************************************************/
 108 struct server_record *find_server(struct work_record *work, char *name)
 109 {
 110         struct server_record *ret;
 111
 112         if (!work) return NULL;
 113
 114         for (ret = work->serverlist; ret; ret = ret->next)
 115         {
 116                 if (strequal(ret->serv.name,name))
 117                 {
 118                         return ret;
 119                 }
 120         }
 121     return NULL;
 122 }
 123
 124
 125 /****************************************************************************
 126   add a server entry
 127   ****************************************************************************/
 128 struct server_record *add_server_entry(struct subnet_record *d,
 129                                        struct work_record *work,
 130                                        char *name,int servertype,
 131                                        int ttl,char *comment,
 132                                        BOOL replace)
 133 {
 134   BOOL newentry=False;
 135   struct server_record *s;
 136
 137   if (name[0] == '*')
 138   {
 139       return (NULL);
 140   }
 141
 142   s = find_server(work, name);
 143
 144   if (s && !replace)
 145   {
 146     DEBUG(4,("Not replacing %s\n",name));
 147     return(s);
 148   }
 149
 150   if (!s || s->serv.type != servertype || !strequal(s->serv.comment, comment))
 151     updatedlists=True;
 152
 153   if (!s)
 154   {
 155     newentry = True;
 156     s = (struct server_record *)malloc(sizeof(*s));
 157
 158     if (!s) return(NULL);
 159
 160     bzero((char *)s,sizeof(*s));
 161   }
 162
 163
 164   if (strequal(lp_workgroup(),work->work_group))
 165     {
 166           if (servertype)
 167         servertype |= SV_TYPE_LOCAL_LIST_ONLY;
 168     }
 169   else
 170     {
 171       servertype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 172     }
 173
 174   /* update the entry */
 175   StrnCpy(s->serv.name,name,sizeof(s->serv.name)-1);
 176   StrnCpy(s->serv.comment,comment,sizeof(s->serv.comment)-1);
 177   strupper(s->serv.name);
 178   s->serv.type  = servertype;
 179   s->death_time = servertype ? (ttl?time(NULL)+ttl*3:0) : (time(NULL)-1);
 180
 181   /* for a domain entry, the comment field refers to the server name */
 182
 183   if (s->serv.type & SV_TYPE_DOMAIN_ENUM) strupper(s->serv.comment);
 184
 185   if (newentry)
 186     {
 187       add_server(work, s);
 188
 189       DEBUG(3,("Added "));
 190     }
 191   else
 192     {
 193       DEBUG(3,("Updated "));
 194     }
 195
 196   DEBUG(3,("server entry %s of type %x (%s) to %s %s\n",
 197            name,servertype,comment,
 198            work->work_group,inet_ntoa(d->bcast_ip)));
 199
 200   return(s);
 201 }
 202
 203
 204 /*******************************************************************
 205   expire old servers in the serverlist
 206   ******************************************************************/
 207 void expire_servers(time_t t)
 208 {
 209   struct subnet_record *d;
 210
 211   for (d = FIRST_SUBNET; d ; d = NEXT_SUBNET_INCLUDING_WINS(d))
 212     {
 213       struct work_record *work;
 214
 215       for (work = d->workgrouplist; work; work = work->next)
 216         {
 217           remove_old_servers(work, t, False);
 218         }
 219     }
 220 }
 221