source/nmbd/nmbd_synclists.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    NBT netbios routines and daemon - version 2
   5    Copyright (C) Andrew Tridgell 1994-1998
   6    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   7    Copyright (C) Jeremy Allison 1994-1998
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 */
  24
  25 /* this file handles asynchronous browse synchronisation requests. The
  26    requests are done by forking and putting the result in a file in the
  27    locks directory. We do it this way because we don't want nmbd to be
  28    blocked waiting for some server to respond on a TCP connection. This
  29    also allows us to have more than 1 sync going at once (tridge) */
  30
  31 #include "includes.h"
  32 #include "smb.h"
  33
  34 extern int DEBUGLEVEL;
  35
  36 struct sync_record {
  37         struct sync_record *next, *prev;
  38         fstring workgroup;
  39         fstring server;
  40         pstring fname;
  41         struct in_addr ip;
  42         int pid;
  43 };
  44
  45 /* a linked list of current sync connections */
  46 static struct sync_record *syncs;
  47
  48 static FILE *fp;
  49
  50 /*******************************************************************
  51   This is the NetServerEnum callback.
  52   ******************************************************************/
  53 static void callback(char *sname, uint32 stype, char *comment)
  54 {
  55         fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  56 }
  57
  58
  59 /*******************************************************************
  60   Synchronise browse lists with another browse server.
  61   Log in on the remote server's SMB port to their IPC$ service,
  62   do a NetServerEnum and record the results in fname
  63 ******************************************************************/
  64 static void sync_child(char *name, int nm_type,
  65                        char *workgroup,
  66                        struct in_addr ip, BOOL local, BOOL servers,
  67                        char *fname)
  68 {
  69         extern fstring local_machine;
  70         static struct cli_state cli;
  71         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  72
  73         if (!cli_initialise(&cli) || !cli_connect(&cli, name, &ip)) {
  74                 fclose(fp);
  75                 return;
  76         }
  77
  78         if (!cli_session_request(&cli, name, nm_type, local_machine)) {
  79                 cli_shutdown(&cli);
  80                 fclose(fp);
  81                 return;
  82         }
  83
  84         if (!cli_negprot(&cli)) {
  85                 cli_shutdown(&cli);
  86                 return;
  87         }
  88
  89         if (!cli_session_setup(&cli, "", "", 1, "", 0, workgroup)) {
  90                 cli_shutdown(&cli);
  91                 return;
  92         }
  93
  94         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
  95                 cli_shutdown(&cli);
  96                 return;
  97         }
  98
  99         /* Fetch a workgroup list. */
 100         cli_NetServerEnum(&cli, workgroup,
 101                           local_type|SV_TYPE_DOMAIN_ENUM,
 102                           callback);
 103
 104         /* Now fetch a server list. */
 105         if (servers) {
 106                 cli_NetServerEnum(&cli, workgroup,
 107                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 108                                   callback);
 109         }
 110
 111         cli_shutdown(&cli);
 112 }
 113
 114
 115 /*******************************************************************
 116   initialise a browse sync with another browse server.  Log in on the
 117   remote server's SMB port to their IPC$ service, do a NetServerEnum
 118   and record the results
 119 ******************************************************************/
 120 void sync_browse_lists(struct work_record *work,
 121                        char *name, int nm_type,
 122                        struct in_addr ip, BOOL local, BOOL servers)
 123 {
 124         struct sync_record *s;
 125         static int counter;
 126
 127         /* Check we're not trying to sync with ourselves. This can
 128            happen if we are a domain *and* a local master browser. */
 129         if (ismyip(ip)) {
 130                 return;
 131         }
 132
 133         s = (struct sync_record *)malloc(sizeof(*s));
 134         if (!s) return;
 135
 136         ZERO_STRUCTP(s);
 137
 138         fstrcpy(s->workgroup, work->work_group);
 139         fstrcpy(s->server, name);
 140         s->ip = ip;
 141
 142         slprintf(s->fname, sizeof(pstring)-1,
 143                  "%s/sync.%d", lp_lockdir(), counter++);
 144         string_sub(s->fname,"//", "/");
 145
 146         DLIST_ADD(syncs, s);
 147
 148         /* the parent forks and returns, leaving the child to do the
 149            actual sync */
 150         CatchChild();
 151         if ((s->pid = fork())) return;
 152
 153         BlockSignals( False, SIGTERM );
 154
 155         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 156                  work->work_group, name, inet_ntoa(ip)));
 157
 158         fp = fopen(s->fname,"w");
 159         if (!fp) _exit(1);
 160
 161         sync_child(name, nm_type, work->work_group, ip, local, servers,
 162                    s->fname);
 163
 164         fclose(fp);
 165         _exit(0);
 166 }
 167
 168 /**********************************************************************
 169 handle one line from a completed sync file
 170  **********************************************************************/
 171 static void complete_one(struct sync_record *s,
 172                          char *sname, uint32 stype, char *comment)
 173 {
 174         struct work_record *work;
 175         struct server_record *servrec;
 176
 177         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 178
 179         if (stype & SV_TYPE_DOMAIN_ENUM) {
 180                 /* See if we can find the workgroup on this subnet. */
 181                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 182                         /* We already know about this workgroup -
 183                            update the ttl. */
 184                         update_workgroup_ttl(work,lp_max_ttl());
 185                 } else {
 186                         /* Create the workgroup on the subnet. */
 187                         work = create_workgroup_on_subnet(unicast_subnet,
 188                                                           sname, lp_max_ttl());
 189                         if (work) {
 190                                 /* remember who the master is */
 191                                 fstrcpy(work->local_master_browser_name,
 192                                         comment);
 193                         }
 194                 }
 195                 return;
 196         }
 197
 198         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 199         if (!work) {
 200                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 201                          s->workgroup));
 202                 return;
 203         }
 204
 205         if ((servrec = find_server_in_workgroup( work, sname))) {
 206                 /* Check that this is not a locally known
 207                    server - if so ignore the entry. */
 208                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 209                         /* We already know about this server - update
 210                            the ttl. */
 211                         update_server_ttl(servrec, lp_max_ttl());
 212                         /* Update the type. */
 213                         servrec->serv.type = stype;
 214                 }
 215                 return;
 216         }
 217
 218         /* Create the server in the workgroup. */
 219         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 220 }
 221
 222
 223 /**********************************************************************
 224 read the completed sync info
 225  **********************************************************************/
 226 static void complete_sync(struct sync_record *s)
 227 {
 228         FILE *f;
 229         fstring server, type_str;
 230         unsigned type;
 231         pstring comment;
 232         pstring line;
 233         char *ptr;
 234         int count=0;
 235
 236         f = fopen(s->fname,"r");
 237
 238         if (!f) return;
 239
 240         while (!feof(f)) {
 241
 242                 if (!fgets_slash(line,sizeof(pstring),f)) continue;
 243
 244                 ptr = line;
 245
 246                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
 247                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
 248                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
 249                         continue;
 250                 }
 251
 252                 sscanf(type_str, "%X", &type);
 253
 254                 complete_one(s, server, type, comment);
 255
 256                 count++;
 257         }
 258
 259         fclose(f);
 260
 261         unlink(s->fname);
 262
 263         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 264                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 265 }
 266
 267 /**********************************************************************
 268 check for completion of any of the child processes
 269  **********************************************************************/
 270 void sync_check_completion(void)
 271 {
 272         struct sync_record *s, *next;
 273
 274         for (s=syncs;s;s=next) {
 275                 next = s->next;
 276                 if (!process_exists(s->pid)) {
 277                         /* it has completed - grab the info */
 278                         complete_sync(s);
 279                         DLIST_REMOVE(syncs, s);
 280                         ZERO_STRUCTP(s);
 281                         free(s);
 282                 }
 283         }
 284 }