source3/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 3 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         struct cli_state *cli;
  72         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  73         struct nmb_name called, calling;
  74         NTSTATUS status;
  75
  76         /* W2K DMB's return empty browse lists on port 445. Use 139.
  77          * Patch from Andy Levine andyl@epicrealm.com.
  78          */
  79
  80         cli = cli_initialise();
  81         if (!cli) {
  82                 return;
  83         }
  84
  85         if (!cli_set_port(cli, 139)) {
  86                 return;
  87         }
  88
  89         status = cli_connect(cli, name, &ip);
  90         if (!NT_STATUS_IS_OK(status)) {
  91                 return;
  92         }
  93
  94         make_nmb_name(&calling, local_machine, 0x0);
  95         make_nmb_name(&called , name, nm_type);
  96
  97         if (!cli_session_request(cli, &calling, &called)) {
  98                 cli_shutdown(cli);
  99                 return;
 100         }
 101
 102         if (!cli_negprot(cli)) {
 103                 cli_shutdown(cli);
 104                 return;
 105         }
 106
 107         if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0,
 108                                                workgroup))) {
 109                 cli_shutdown(cli);
 110                 return;
 111         }
 112
 113         if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
 114                 cli_shutdown(cli);
 115                 return;
 116         }
 117
 118         /* All the cli_XX functions take UNIX character set. */
 119         fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
 120
 121         /* Fetch a workgroup list. */
 122         cli_NetServerEnum(cli, unix_workgroup,
 123                           local_type|SV_TYPE_DOMAIN_ENUM,
 124                           callback, NULL);
 125
 126         /* Now fetch a server list. */
 127         if (servers) {
 128                 fstrcpy(unix_workgroup, workgroup);
 129                 cli_NetServerEnum(cli, unix_workgroup,
 130                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 131                                   callback, NULL);
 132         }
 133
 134         cli_shutdown(cli);
 135 }
 136
 137 /*******************************************************************
 138   initialise a browse sync with another browse server.  Log in on the
 139   remote server's SMB port to their IPC$ service, do a NetServerEnum
 140   and record the results
 141 ******************************************************************/
 142
 143 void sync_browse_lists(struct work_record *work,
 144                        char *name, int nm_type,
 145                        struct in_addr ip, BOOL local, BOOL servers)
 146 {
 147         struct sync_record *s;
 148         static int counter;
 149
 150         START_PROFILE(sync_browse_lists);
 151         /* Check we're not trying to sync with ourselves. This can
 152            happen if we are a domain *and* a local master browser. */
 153         if (ismyip(ip)) {
 154 done:
 155                 END_PROFILE(sync_browse_lists);
 156                 return;
 157         }
 158
 159         s = SMB_MALLOC_P(struct sync_record);
 160         if (!s) goto done;
 161
 162         ZERO_STRUCTP(s);
 163
 164         unstrcpy(s->workgroup, work->work_group);
 165         unstrcpy(s->server, name);
 166         s->ip = ip;
 167
 168         slprintf(s->fname, sizeof(pstring)-1,
 169                  "%s/sync.%d", lp_lockdir(), counter++);
 170         all_string_sub(s->fname,"//", "/", 0);
 171
 172         DLIST_ADD(syncs, s);
 173
 174         /* the parent forks and returns, leaving the child to do the
 175            actual sync and call END_PROFILE*/
 176         CatchChild();
 177         if ((s->pid = sys_fork())) return;
 178
 179         BlockSignals( False, SIGTERM );
 180
 181         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 182                  work->work_group, name, inet_ntoa(ip)));
 183
 184         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
 185         if (!fp) {
 186                 END_PROFILE(sync_browse_lists);
 187                 _exit(1);
 188         }
 189
 190         sync_child(name, nm_type, work->work_group, ip, local, servers,
 191                    s->fname);
 192
 193         x_fclose(fp);
 194         END_PROFILE(sync_browse_lists);
 195         _exit(0);
 196 }
 197
 198 /**********************************************************************
 199  Handle one line from a completed sync file.
 200  **********************************************************************/
 201
 202 static void complete_one(struct sync_record *s,
 203                          char *sname, uint32 stype, char *comment)
 204 {
 205         struct work_record *work;
 206         struct server_record *servrec;
 207
 208         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 209
 210         if (stype & SV_TYPE_DOMAIN_ENUM) {
 211                 /* See if we can find the workgroup on this subnet. */
 212                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 213                         /* We already know about this workgroup -
 214                            update the ttl. */
 215                         update_workgroup_ttl(work,lp_max_ttl());
 216                 } else {
 217                         /* Create the workgroup on the subnet. */
 218                         work = create_workgroup_on_subnet(unicast_subnet,
 219                                                           sname, lp_max_ttl());
 220                         if (work) {
 221                                 /* remember who the master is */
 222                                 unstrcpy(work->local_master_browser_name, comment);
 223                         }
 224                 }
 225                 return;
 226         }
 227
 228         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 229         if (!work) {
 230                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 231                          s->workgroup));
 232                 return;
 233         }
 234
 235         if ((servrec = find_server_in_workgroup( work, sname))) {
 236                 /* Check that this is not a locally known
 237                    server - if so ignore the entry. */
 238                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 239                         /* We already know about this server - update
 240                            the ttl. */
 241                         update_server_ttl(servrec, lp_max_ttl());
 242                         /* Update the type. */
 243                         servrec->serv.type = stype;
 244                 }
 245                 return;
 246         }
 247
 248         /* Create the server in the workgroup. */
 249         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 250 }
 251
 252 /**********************************************************************
 253  Read the completed sync info.
 254 **********************************************************************/
 255
 256 static void complete_sync(struct sync_record *s)
 257 {
 258         XFILE *f;
 259         unstring server, type_str;
 260         unsigned type;
 261         pstring comment;
 262         pstring line;
 263         const char *ptr;
 264         int count=0;
 265
 266         f = x_fopen(s->fname,O_RDONLY, 0);
 267
 268         if (!f)
 269                 return;
 270
 271         while (!x_feof(f)) {
 272
 273                 if (!fgets_slash(line,sizeof(pstring),f))
 274                         continue;
 275
 276                 ptr = line;
 277
 278                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
 279                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
 280                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
 281                         continue;
 282                 }
 283
 284                 sscanf(type_str, "%X", &type);
 285
 286                 complete_one(s, server, type, comment);
 287
 288                 count++;
 289         }
 290
 291         x_fclose(f);
 292
 293         unlink(s->fname);
 294
 295         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 296                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 297 }
 298
 299 /**********************************************************************
 300  Check for completion of any of the child processes.
 301 **********************************************************************/
 302
 303 void sync_check_completion(void)
 304 {
 305         struct sync_record *s, *next;
 306
 307         for (s=syncs;s;s=next) {
 308                 next = s->next;
 309                 if (!process_exists_by_pid(s->pid)) {
 310                         /* it has completed - grab the info */
 311                         complete_sync(s);
 312                         DLIST_REMOVE(syncs, s);
 313                         ZERO_STRUCTP(s);
 314                         SAFE_FREE(s);
 315                 }
 316         }
 317 }