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, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 /* this file handles asynchronous browse synchronisation requests. The
  24    requests are done by forking and putting the result in a file in the
  25    locks directory. We do it this way because we don't want nmbd to be
  26    blocked waiting for some server to respond on a TCP connection. This
  27    also allows us to have more than 1 sync going at once (tridge) */
  28
  29 #include "includes.h"
  30
  31 extern fstring local_machine;
  32
  33 struct sync_record {
  34         struct sync_record *next, *prev;
  35         unstring workgroup;
  36         unstring server;
  37         pstring fname;
  38         struct in_addr ip;
  39         pid_t pid;
  40 };
  41
  42 /* a linked list of current sync connections */
  43 static struct sync_record *syncs;
  44
  45 static XFILE *fp;
  46
  47 /*******************************************************************
  48   This is the NetServerEnum callback.
  49   Note sname and comment are in UNIX codepage format.
  50   ******************************************************************/
  51
  52 static void callback(const char *sname, uint32 stype,
  53                      const char *comment, void *state)
  54 {
  55         x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  56 }
  57
  58 /*******************************************************************
  59   Synchronise browse lists with another browse server.
  60   Log in on the remote server's SMB port to their IPC$ service,
  61   do a NetServerEnum and record the results in fname
  62 ******************************************************************/
  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         fstring unix_workgroup;
  70         struct cli_state *cli;
  71         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  72         struct nmb_name called, calling;
  73         NTSTATUS status;
  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         cli = cli_initialise();
  80         if (!cli) {
  81                 return;
  82         }
  83
  84         if (!cli_set_port(cli, 139)) {
  85                 return;
  86         }
  87
  88         status = cli_connect(cli, name, &ip);
  89         if (!NT_STATUS_IS_OK(status)) {
  90                 return;
  91         }
  92
  93         make_nmb_name(&calling, local_machine, 0x0);
  94         make_nmb_name(&called , name, nm_type);
  95
  96         if (!cli_session_request(cli, &calling, &called)) {
  97                 cli_shutdown(cli);
  98                 return;
  99         }
 100
 101         if (!cli_negprot(cli)) {
 102                 cli_shutdown(cli);
 103                 return;
 104         }
 105
 106         if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0,
 107                                                workgroup))) {
 108                 cli_shutdown(cli);
 109                 return;
 110         }
 111
 112         if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
 113                 cli_shutdown(cli);
 114                 return;
 115         }
 116
 117         /* All the cli_XX functions take UNIX character set. */
 118         fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
 119
 120         /* Fetch a workgroup list. */
 121         cli_NetServerEnum(cli, unix_workgroup,
 122                           local_type|SV_TYPE_DOMAIN_ENUM,
 123                           callback, NULL);
 124
 125         /* Now fetch a server list. */
 126         if (servers) {
 127                 fstrcpy(unix_workgroup, workgroup);
 128                 cli_NetServerEnum(cli, unix_workgroup,
 129                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 130                                   callback, NULL);
 131         }
 132
 133         cli_shutdown(cli);
 134 }
 135
 136 /*******************************************************************
 137   initialise a browse sync with another browse server.  Log in on the
 138   remote server's SMB port to their IPC$ service, do a NetServerEnum
 139   and record the results
 140 ******************************************************************/
 141
 142 void sync_browse_lists(struct work_record *work,
 143                        char *name, int nm_type,
 144                        struct in_addr ip, bool local, bool servers)
 145 {
 146         struct sync_record *s;
 147         static int counter;
 148
 149         START_PROFILE(sync_browse_lists);
 150         /* Check we're not trying to sync with ourselves. This can
 151            happen if we are a domain *and* a local master browser. */
 152         if (ismyip_v4(ip)) {
 153 done:
 154                 END_PROFILE(sync_browse_lists);
 155                 return;
 156         }
 157
 158         s = SMB_MALLOC_P(struct sync_record);
 159         if (!s) goto done;
 160
 161         ZERO_STRUCTP(s);
 162
 163         unstrcpy(s->workgroup, work->work_group);
 164         unstrcpy(s->server, name);
 165         s->ip = ip;
 166
 167         slprintf(s->fname, sizeof(pstring)-1,
 168                  "%s/sync.%d", lp_lockdir(), counter++);
 169         all_string_sub(s->fname,"//", "/", 0);
 170
 171         DLIST_ADD(syncs, s);
 172
 173         /* the parent forks and returns, leaving the child to do the
 174            actual sync and call END_PROFILE*/
 175         CatchChild();
 176         if ((s->pid = sys_fork())) return;
 177
 178         BlockSignals( False, SIGTERM );
 179
 180         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 181                  work->work_group, name, inet_ntoa(ip)));
 182
 183         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
 184         if (!fp) {
 185                 END_PROFILE(sync_browse_lists);
 186                 _exit(1);
 187         }
 188
 189         sync_child(name, nm_type, work->work_group, ip, local, servers,
 190                    s->fname);
 191
 192         x_fclose(fp);
 193         END_PROFILE(sync_browse_lists);
 194         _exit(0);
 195 }
 196
 197 /**********************************************************************
 198  Handle one line from a completed sync file.
 199  **********************************************************************/
 200
 201 static void complete_one(struct sync_record *s,
 202                          char *sname, uint32 stype, char *comment)
 203 {
 204         struct work_record *work;
 205         struct server_record *servrec;
 206
 207         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 208
 209         if (stype & SV_TYPE_DOMAIN_ENUM) {
 210                 /* See if we can find the workgroup on this subnet. */
 211                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 212                         /* We already know about this workgroup -
 213                            update the ttl. */
 214                         update_workgroup_ttl(work,lp_max_ttl());
 215                 } else {
 216                         /* Create the workgroup on the subnet. */
 217                         work = create_workgroup_on_subnet(unicast_subnet,
 218                                                           sname, lp_max_ttl());
 219                         if (work) {
 220                                 /* remember who the master is */
 221                                 unstrcpy(work->local_master_browser_name, comment);
 222                         }
 223                 }
 224                 return;
 225         }
 226
 227         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 228         if (!work) {
 229                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 230                          s->workgroup));
 231                 return;
 232         }
 233
 234         if ((servrec = find_server_in_workgroup( work, sname))) {
 235                 /* Check that this is not a locally known
 236                    server - if so ignore the entry. */
 237                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 238                         /* We already know about this server - update
 239                            the ttl. */
 240                         update_server_ttl(servrec, lp_max_ttl());
 241                         /* Update the type. */
 242                         servrec->serv.type = stype;
 243                 }
 244                 return;
 245         }
 246
 247         /* Create the server in the workgroup. */
 248         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 249 }
 250
 251 /**********************************************************************
 252  Read the completed sync info.
 253 **********************************************************************/
 254
 255 static void complete_sync(struct sync_record *s)
 256 {
 257         XFILE *f;
 258         unstring server, type_str;
 259         unsigned type;
 260         pstring comment;
 261         pstring line;
 262         const char *ptr;
 263         int count=0;
 264
 265         f = x_fopen(s->fname,O_RDONLY, 0);
 266
 267         if (!f)
 268                 return;
 269
 270         while (!x_feof(f)) {
 271
 272                 if (!fgets_slash(line,sizeof(pstring),f))
 273                         continue;
 274
 275                 ptr = line;
 276
 277                 if (!next_token(&ptr,server,NULL,sizeof(server)) ||
 278                     !next_token(&ptr,type_str,NULL, sizeof(type_str)) ||
 279                     !next_token(&ptr,comment,NULL, sizeof(comment))) {
 280                         continue;
 281                 }
 282
 283                 sscanf(type_str, "%X", &type);
 284
 285                 complete_one(s, server, type, comment);
 286
 287                 count++;
 288         }
 289
 290         x_fclose(f);
 291
 292         unlink(s->fname);
 293
 294         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 295                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 296 }
 297
 298 /**********************************************************************
 299  Check for completion of any of the child processes.
 300 **********************************************************************/
 301
 302 void sync_check_completion(void)
 303 {
 304         struct sync_record *s, *next;
 305
 306         for (s=syncs;s;s=next) {
 307                 next = s->next;
 308                 if (!process_exists_by_pid(s->pid)) {
 309                         /* it has completed - grab the info */
 310                         complete_sync(s);
 311                         DLIST_REMOVE(syncs, s);
 312                         ZERO_STRUCTP(s);
 313                         SAFE_FREE(s);
 314                 }
 315         }
 316 }