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 extern pstring scope;
  36
  37 struct sync_record {
  38         struct sync_record *next, *prev;
  39         fstring workgroup;
  40         fstring server;
  41         pstring fname;
  42         struct in_addr ip;
  43         pid_t pid;
  44 };
  45
  46 /* a linked list of current sync connections */
  47 static struct sync_record *syncs;
  48
  49 static FILE *fp;
  50
  51 /*******************************************************************
  52   This is the NetServerEnum callback.
  53   ******************************************************************/
  54 static void callback(const char *sname, uint32 stype, const char *comment)
  55 {
  56         fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  57 }
  58
  59
  60 /*******************************************************************
  61   Synchronise browse lists with another browse server.
  62   Log in on the remote server's SMB port to their IPC$ service,
  63   do a NetServerEnum and record the results in fname
  64 ******************************************************************/
  65 static void sync_child(char *name, int nm_type,
  66                        char *workgroup,
  67                        struct in_addr ip, BOOL local, BOOL servers,
  68                        char *fname)
  69 {
  70         extern fstring local_machine;
  71         static struct cli_state cli;
  72         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  73         struct nmb_name called, calling;
  74
  75         if (!cli_initialise(&cli) || !cli_connect(&cli, name, &ip)) {
  76                 fclose(fp);
  77                 return;
  78         }
  79
  80         make_nmb_name(&calling, local_machine, 0x0    , scope);
  81         make_nmb_name(&called , name         , nm_type, scope);
  82
  83         if (!cli_session_request(&cli, &calling, &called))
  84         {
  85                 cli_shutdown(&cli);
  86                 fclose(fp);
  87                 return;
  88         }
  89
  90         if (!cli_negprot(&cli)) {
  91                 cli_shutdown(&cli);
  92                 return;
  93         }
  94
  95         if (!cli_session_setup(&cli, "", "", 1, "", 0, workgroup)) {
  96                 cli_shutdown(&cli);
  97                 return;
  98         }
  99
 100         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
 101                 cli_shutdown(&cli);
 102                 return;
 103         }
 104
 105         /* Fetch a workgroup list. */
 106         cli_NetServerEnum(&cli, cli.server_domain?cli.server_domain:workgroup,
 107                           local_type|SV_TYPE_DOMAIN_ENUM,
 108                           callback);
 109
 110         /* Now fetch a server list. */
 111         if (servers) {
 112                 cli_NetServerEnum(&cli, workgroup,
 113                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 114                                   callback);
 115         }
 116
 117         cli_shutdown(&cli);
 118 }
 119
 120
 121 /*******************************************************************
 122   initialise a browse sync with another browse server.  Log in on the
 123   remote server's SMB port to their IPC$ service, do a NetServerEnum
 124   and record the results
 125 ******************************************************************/
 126 void sync_browse_lists(struct work_record *work,
 127                        char *name, int nm_type,
 128                        struct in_addr ip, BOOL local, BOOL servers)
 129 {
 130         struct sync_record *s;
 131         static int counter;
 132
 133         /* Check we're not trying to sync with ourselves. This can
 134            happen if we are a domain *and* a local master browser. */
 135         if (ismyip(ip)) {
 136                 return;
 137         }
 138
 139         s = (struct sync_record *)malloc(sizeof(*s));
 140         if (!s) return;
 141
 142         ZERO_STRUCTP(s);
 143
 144         fstrcpy(s->workgroup, work->work_group);
 145         fstrcpy(s->server, name);
 146         s->ip = ip;
 147
 148         slprintf(s->fname, sizeof(pstring)-1,
 149                  "%s/sync.%d", lp_lockdir(), counter++);
 150         all_string_sub(s->fname,"//", "/", 0);
 151
 152         DLIST_ADD(syncs, s);
 153
 154         /* the parent forks and returns, leaving the child to do the
 155            actual sync */
 156         CatchChild();
 157         if ((s->pid = fork())) return;
 158
 159         BlockSignals( False, SIGTERM );
 160
 161         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 162                  work->work_group, name, inet_ntoa(ip)));
 163
 164         fp = sys_fopen(s->fname,"w");
 165         if (!fp) _exit(1);
 166
 167         sync_child(name, nm_type, work->work_group, ip, local, servers,
 168                    s->fname);
 169
 170         fclose(fp);
 171         _exit(0);
 172 }
 173
 174 /**********************************************************************
 175 handle one line from a completed sync file
 176  **********************************************************************/
 177 static void complete_one(struct sync_record *s,
 178                          char *sname, uint32 stype, char *comment)
 179 {
 180         struct work_record *work;
 181         struct server_record *servrec;
 182
 183         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 184
 185         if (stype & SV_TYPE_DOMAIN_ENUM) {
 186                 /* See if we can find the workgroup on this subnet. */
 187                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 188                         /* We already know about this workgroup -
 189                            update the ttl. */
 190                         update_workgroup_ttl(work,lp_max_ttl());
 191                 } else {
 192                         /* Create the workgroup on the subnet. */
 193                         work = create_workgroup_on_subnet(unicast_subnet,
 194                                                           sname, lp_max_ttl());
 195                         if (work) {
 196                                 /* remember who the master is */
 197                                 fstrcpy(work->local_master_browser_name,
 198                                         comment);
 199                         }
 200                 }
 201                 return;
 202         }
 203
 204         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 205         if (!work) {
 206                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 207                          s->workgroup));
 208                 return;
 209         }
 210
 211         if ((servrec = find_server_in_workgroup( work, sname))) {
 212                 /* Check that this is not a locally known
 213                    server - if so ignore the entry. */
 214                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 215                         /* We already know about this server - update
 216                            the ttl. */
 217                         update_server_ttl(servrec, lp_max_ttl());
 218                         /* Update the type. */
 219                         servrec->serv.type = stype;
 220                 }
 221                 return;
 222         }
 223
 224         /* Create the server in the workgroup. */
 225         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 226 }
 227
 228
 229 /**********************************************************************
 230 read the completed sync info
 231  **********************************************************************/
 232 static void complete_sync(struct sync_record *s)
 233 {
 234         FILE *f;
 235         fstring server, type_str;
 236         unsigned type;
 237         pstring comment;
 238         pstring line;
 239         char *ptr;
 240         int count=0;
 241
 242         f = sys_fopen(s->fname,"r");
 243
 244         if (!f) return;
 245
 246         while (!feof(f)) {
 247
 248                 if (!fgets_slash(line,sizeof(pstring),f)) continue;
 249
 250                 ptr = line;
 251
 252                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
 253                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
 254                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
 255                         continue;
 256                 }
 257
 258                 sscanf(type_str, "%X", &type);
 259
 260                 complete_one(s, server, type, comment);
 261
 262                 count++;
 263         }
 264
 265         fclose(f);
 266
 267         unlink(s->fname);
 268
 269         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 270                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 271 }
 272
 273 /**********************************************************************
 274 check for completion of any of the child processes
 275  **********************************************************************/
 276 void sync_check_completion(void)
 277 {
 278         struct sync_record *s, *next;
 279
 280         for (s=syncs;s;s=next) {
 281                 next = s->next;
 282                 if (!process_exists(s->pid)) {
 283                         /* it has completed - grab the info */
 284                         complete_sync(s);
 285                         DLIST_REMOVE(syncs, s);
 286                         ZERO_STRUCTP(s);
 287                         free(s);
 288                 }
 289         }
 290 }