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 extern fstring myworkgroup;
  41
  42 /* this is our domain/workgroup/server database */
  43 extern struct subnet_record *subnetlist;
  44
  45 extern BOOL updatedlists;
  46
  47
  48 /*******************************************************************
  49   expire old servers in the serverlist
  50   time of -1 indicates everybody dies except those with time of 0
  51   remove_all_servers indicates everybody dies.
  52   ******************************************************************/
  53 void remove_old_servers(struct work_record *work, time_t t,
  54                                         BOOL remove_all)
  55 {
  56   struct server_record *s;
  57   struct server_record *nexts;
  58
  59   /* expire old entries in the serverlist */
  60   for (s = work->serverlist; s; s = nexts)
  61     {
  62       if (remove_all || (s->death_time && (t == -1 || s->death_time < t)))
  63         {
  64           DEBUG(3,("Removing dead server %s\n",s->serv.name));
  65           updatedlists = True;
  66           nexts = s->next;
  67
  68           if (s->prev) s->prev->next = s->next;
  69           if (s->next) s->next->prev = s->prev;
  70
  71           if (work->serverlist == s)
  72             work->serverlist = s->next;
  73
  74           free(s);
  75         }
  76       else
  77         {
  78           nexts = s->next;
  79         }
  80     }
  81 }
  82
  83
  84 /***************************************************************************
  85   add a server into the list
  86   **************************************************************************/
  87 static void add_server(struct work_record *work,struct server_record *s)
  88 {
  89   struct server_record *s2;
  90
  91   if (!work->serverlist) {
  92     work->serverlist = s;
  93     s->prev = NULL;
  94     s->next = NULL;
  95     return;
  96   }
  97
  98   for (s2 = work->serverlist; s2->next; s2 = s2->next) ;
  99
 100   s2->next = s;
 101   s->next = NULL;
 102   s->prev = s2;
 103 }
 104
 105
 106 /****************************************************************************
 107   find a server in a server list.
 108   **************************************************************************/
 109 struct server_record *find_server(struct work_record *work, char *name)
 110 {
 111         struct server_record *ret;
 112
 113         if (!work) return NULL;
 114
 115         for (ret = work->serverlist; ret; ret = ret->next)
 116         {
 117                 if (strequal(ret->serv.name,name))
 118                 {
 119                         return ret;
 120                 }
 121         }
 122     return NULL;
 123 }
 124
 125
 126 /****************************************************************************
 127   add a server entry
 128   ****************************************************************************/
 129 struct server_record *add_server_entry(struct subnet_record *d,
 130                                        struct work_record *work,
 131                                        char *name,int servertype,
 132                                        int ttl,char *comment,
 133                                        BOOL replace)
 134 {
 135   BOOL newentry=False;
 136   struct server_record *s;
 137
 138   if (name[0] == '*')
 139   {
 140       return (NULL);
 141   }
 142
 143   s = find_server(work, name);
 144
 145   if (s && !replace)
 146   {
 147     DEBUG(4,("Not replacing %s\n",name));
 148     return(s);
 149   }
 150
 151   if (!s || s->serv.type != servertype || !strequal(s->serv.comment, comment))
 152     updatedlists=True;
 153
 154   if (!s)
 155   {
 156     newentry = True;
 157     s = (struct server_record *)malloc(sizeof(*s));
 158
 159     if (!s) return(NULL);
 160
 161     bzero((char *)s,sizeof(*s));
 162   }
 163
 164
 165   /* update the entry */
 166   StrnCpy(s->serv.name,name,sizeof(s->serv.name)-1);
 167   StrnCpy(s->serv.comment,comment,sizeof(s->serv.comment)-1);
 168   strupper(s->serv.name);
 169   s->serv.type  = servertype;
 170   s->death_time = servertype ? (ttl?time(NULL)+ttl*3:0) : (time(NULL)-1);
 171
 172   /* for a domain entry, the comment field refers to the server name */
 173
 174   if (s->serv.type & SV_TYPE_DOMAIN_ENUM) strupper(s->serv.comment);
 175
 176   if (newentry)
 177     {
 178       add_server(work, s);
 179
 180       DEBUG(3,("Added "));
 181     }
 182   else
 183     {
 184       DEBUG(3,("Updated "));
 185     }
 186
 187   DEBUG(3,("server entry %s of type %x (%s) to %s %s\n",
 188            name,servertype,comment,
 189            work->work_group,inet_ntoa(d->bcast_ip)));
 190
 191   return(s);
 192 }
 193
 194
 195 /*******************************************************************
 196   expire old servers in the serverlist
 197   ******************************************************************/
 198 void expire_servers(time_t t)
 199 {
 200   struct subnet_record *d;
 201
 202   for (d = FIRST_SUBNET; d ; d = NEXT_SUBNET_INCLUDING_WINS(d))
 203     {
 204       struct work_record *work;
 205
 206       for (work = d->workgrouplist; work; work = work->next)
 207         {
 208           remove_old_servers(work, t, False);
 209         }
 210     }
 211 }
 212