source/nmbd/nmbd_synclists.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    NBT netbios routines and daemon - version 2
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   6    Copyright (C) Jeremy Allison 1994-1998
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22 */
  23
  24 /* this file handles asynchronous browse synchronisation requests. The
  25    requests are done by forking and putting the result in a file in the
  26    locks directory. We do it this way because we don't want nmbd to be
  27    blocked waiting for some server to respond on a TCP connection. This
  28    also allows us to have more than 1 sync going at once (tridge) */
  29
  30 #include "includes.h"
  31
  32 extern fstring local_machine;
  33
  34 struct sync_record {
  35         struct sync_record *next, *prev;
  36         unstring workgroup;
  37         unstring server;
  38         pstring fname;
  39         struct in_addr ip;
  40         pid_t pid;
  41 };
  42
  43 /* a linked list of current sync connections */
  44 static struct sync_record *syncs;
  45
  46 static XFILE *fp;
  47
  48 /*******************************************************************
  49   This is the NetServerEnum callback.
  50   Note sname and comment are in UNIX codepage format.
  51   ******************************************************************/
  52
  53 static void callback(const char *sname, uint32 stype,
  54                      const char *comment, void *state)
  55 {
  56         x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  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
  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         fstring unix_workgroup;
  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         /* W2K DMB's return empty browse lists on port 445. Use 139.
  76          * Patch from Andy Levine andyl@epicrealm.com.
  77          */
  78
  79         if (!cli_initialise(&cli) || !cli_set_port(&cli, 139) || !cli_connect(&cli, name, &ip)) {
  80                 return;
  81         }
  82
  83         make_nmb_name(&calling, local_machine, 0x0);
  84         make_nmb_name(&called , name, nm_type);
  85
  86         if (!cli_session_request(&cli, &calling, &called)) {
  87                 cli_shutdown(&cli);
  88                 return;
  89         }
  90
  91         if (!cli_negprot(&cli)) {
  92                 cli_shutdown(&cli);
  93                 return;
  94         }
  95
  96         if (!cli_session_setup(&cli, "", "", 1, "", 0, workgroup)) {
  97                 cli_shutdown(&cli);
  98                 return;
  99         }
 100
 101         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
 102                 cli_shutdown(&cli);
 103                 return;
 104         }
 105
 106         /* All the cli_XX functions take UNIX character set. */
 107         fstrcpy(unix_workgroup, cli.server_domain?cli.server_domain:workgroup);
 108
 109         /* Fetch a workgroup list. */
 110         cli_NetServerEnum(&cli, unix_workgroup,
 111                           local_type|SV_TYPE_DOMAIN_ENUM,
 112                           callback, NULL);
 113
 114         /* Now fetch a server list. */
 115         if (servers) {
 116                 fstrcpy(unix_workgroup, workgroup);
 117                 cli_NetServerEnum(&cli, unix_workgroup,
 118                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 119                                   callback, NULL);
 120         }
 121
 122         cli_shutdown(&cli);
 123 }
 124
 125 /*******************************************************************
 126   initialise a browse sync with another browse server.  Log in on the
 127   remote server's SMB port to their IPC$ service, do a NetServerEnum
 128   and record the results
 129 ******************************************************************/
 130
 131 void sync_browse_lists(struct work_record *work,
 132                        char *name, int nm_type,
 133                        struct in_addr ip, BOOL local, BOOL servers)
 134 {
 135         struct sync_record *s;
 136         static int counter;
 137
 138         START_PROFILE(sync_browse_lists);
 139         /* Check we're not trying to sync with ourselves. This can
 140            happen if we are a domain *and* a local master browser. */
 141         if (ismyip(ip)) {
 142 done:
 143                 END_PROFILE(sync_browse_lists);
 144                 return;
 145         }
 146
 147         s = SMB_MALLOC_P(struct sync_record);
 148         if (!s) goto done;
 149
 150         ZERO_STRUCTP(s);
 151
 152         unstrcpy(s->workgroup, work->work_group);
 153         unstrcpy(s->server, name);
 154         s->ip = ip;
 155
 156         slprintf(s->fname, sizeof(pstring)-1,
 157                  "%s/sync.%d", lp_lockdir(), counter++);
 158         all_string_sub(s->fname,"//", "/", 0);
 159
 160         DLIST_ADD(syncs, s);
 161
 162         /* the parent forks and returns, leaving the child to do the
 163            actual sync and call END_PROFILE*/
 164         CatchChild();
 165         if ((s->pid = sys_fork())) return;
 166
 167         BlockSignals( False, SIGTERM );
 168
 169         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 170                  work->work_group, name, inet_ntoa(ip)));
 171
 172         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
 173         if (!fp) {
 174                 END_PROFILE(sync_browse_lists);
 175                 _exit(1);
 176         }
 177
 178         sync_child(name, nm_type, work->work_group, ip, local, servers,
 179                    s->fname);
 180
 181         x_fclose(fp);
 182         END_PROFILE(sync_browse_lists);
 183         _exit(0);
 184 }
 185
 186 /**********************************************************************
 187  Handle one line from a completed sync file.
 188  **********************************************************************/
 189
 190 static void complete_one(struct sync_record *s,
 191                          char *sname, uint32 stype, char *comment)
 192 {
 193         struct work_record *work;
 194         struct server_record *servrec;
 195
 196         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 197
 198         if (stype & SV_TYPE_DOMAIN_ENUM) {
 199                 /* See if we can find the workgroup on this subnet. */
 200                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 201                         /* We already know about this workgroup -
 202                            update the ttl. */
 203                         update_workgroup_ttl(work,lp_max_ttl());
 204                 } else {
 205                         /* Create the workgroup on the subnet. */
 206                         work = create_workgroup_on_subnet(unicast_subnet,
 207                                                           sname, lp_max_ttl());
 208                         if (work) {
 209                                 /* remember who the master is */
 210                                 unstrcpy(work->local_master_browser_name, comment);
 211                         }
 212                 }
 213                 return;
 214         }
 215
 216         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 217         if (!work) {
 218                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 219                          s->workgroup));
 220                 return;
 221         }
 222
 223         if ((servrec = find_server_in_workgroup( work, sname))) {
 224                 /* Check that this is not a locally known
 225                    server - if so ignore the entry. */
 226                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 227                         /* We already know about this server - update
 228                            the ttl. */
 229                         update_server_ttl(servrec, lp_max_ttl());
 230                         /* Update the type. */
 231                         servrec->serv.type = stype;
 232                 }
 233                 return;
 234         }
 235
 236         /* Create the server in the workgroup. */
 237         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 238 }
 239
 240 /**********************************************************************
 241  Read the completed sync info.
 242 **********************************************************************/
 243
 244 static void complete_sync(struct sync_record *s)
 245 {
 246         XFILE *f;
 247         unstring server, type_str;
 248         unsigned type;
 249         pstring comment;
 250         pstring line;
 251         const char *ptr;
 252         int count=0;
 253
 254         f = x_fopen(s->fname,O_RDONLY, 0);
 255
 256         if (!f)
 257                 return;
 258
 259         while (!x_feof(f)) {
 260
 261                 if (!fgets_slash(line,sizeof(pstring),f))
 262                         continue;
 263
 264                 ptr = line;
 265
 266                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
 267                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
 268                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
 269                         continue;
 270                 }
 271
 272                 sscanf(type_str, "%X", &type);
 273
 274                 complete_one(s, server, type, comment);
 275
 276                 count++;
 277         }
 278
 279         x_fclose(f);
 280
 281         unlink(s->fname);
 282
 283         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 284                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 285 }
 286
 287 /**********************************************************************
 288  Check for completion of any of the child processes.
 289 **********************************************************************/
 290
 291 void sync_check_completion(void)
 292 {
 293         struct sync_record *s, *next;
 294
 295         for (s=syncs;s;s=next) {
 296                 next = s->next;
 297                 if (!process_exists_by_pid(s->pid)) {
 298                         /* it has completed - grab the info */
 299                         complete_sync(s);
 300                         DLIST_REMOVE(syncs, s);
 301                         ZERO_STRUCTP(s);
 302                         SAFE_FREE(s);
 303                 }
 304         }
 305 }