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 #include "../librpc/gen_ndr/svcctl.h"
  31
  32 struct sync_record {
  33         struct sync_record *next, *prev;
  34         unstring workgroup;
  35         unstring server;
  36         char *fname;
  37         struct in_addr ip;
  38         pid_t pid;
  39 };
  40
  41 /* a linked list of current sync connections */
  42 static struct sync_record *syncs;
  43
  44 static XFILE *fp;
  45
  46 /*******************************************************************
  47   This is the NetServerEnum callback.
  48   Note sname and comment are in UNIX codepage format.
  49   ******************************************************************/
  50
  51 static void callback(const char *sname, uint32 stype,
  52                      const char *comment, void *state)
  53 {
  54         x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  55 }
  56
  57 /*******************************************************************
  58   Synchronise browse lists with another browse server.
  59   Log in on the remote server's SMB port to their IPC$ service,
  60   do a NetServerEnum and record the results in fname
  61 ******************************************************************/
  62
  63 static void sync_child(char *name, int nm_type,
  64                        char *workgroup,
  65                        struct in_addr ip, bool local, bool servers,
  66                        char *fname)
  67 {
  68         fstring unix_workgroup;
  69         struct cli_state *cli;
  70         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  71         struct nmb_name called, calling;
  72         struct sockaddr_storage ss;
  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         cli_set_port(cli, 139);
  85
  86         in_addr_to_sockaddr_storage(&ss, ip);
  87         status = cli_connect(cli, name, &ss);
  88         if (!NT_STATUS_IS_OK(status)) {
  89                 cli_shutdown(cli);
  90                 return;
  91         }
  92
  93         make_nmb_name(&calling, get_local_machine_name(), 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         status = cli_negprot(cli);
 102         if (!NT_STATUS_IS_OK(status)) {
 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 (!NT_STATUS_IS_OK(cli_tcon_andx(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_v4(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         if (asprintf(&s->fname, "%s/sync.%d", lp_lockdir(), counter++) < 0) {
 169                 SAFE_FREE(s);
 170                 goto done;
 171         }
 172         /* Safe to use as 0 means no size change. */
 173         all_string_sub(s->fname,"//", "/", 0);
 174
 175         DLIST_ADD(syncs, s);
 176
 177         /* the parent forks and returns, leaving the child to do the
 178            actual sync and call END_PROFILE*/
 179         CatchChild();
 180         if ((s->pid = sys_fork())) return;
 181
 182         BlockSignals( False, SIGTERM );
 183
 184         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 185                  work->work_group, name, inet_ntoa(ip)));
 186
 187         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
 188         if (!fp) {
 189                 END_PROFILE(sync_browse_lists);
 190                 _exit(1);
 191         }
 192
 193         sync_child(name, nm_type, work->work_group, ip, local, servers,
 194                    s->fname);
 195
 196         x_fclose(fp);
 197         END_PROFILE(sync_browse_lists);
 198         _exit(0);
 199 }
 200
 201 /**********************************************************************
 202  Handle one line from a completed sync file.
 203  **********************************************************************/
 204
 205 static void complete_one(struct sync_record *s,
 206                          char *sname, uint32 stype, char *comment)
 207 {
 208         struct work_record *work;
 209         struct server_record *servrec;
 210
 211         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 212
 213         if (stype & SV_TYPE_DOMAIN_ENUM) {
 214                 /* See if we can find the workgroup on this subnet. */
 215                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 216                         /* We already know about this workgroup -
 217                            update the ttl. */
 218                         update_workgroup_ttl(work,lp_max_ttl());
 219                 } else {
 220                         /* Create the workgroup on the subnet. */
 221                         work = create_workgroup_on_subnet(unicast_subnet,
 222                                                           sname, lp_max_ttl());
 223                         if (work) {
 224                                 /* remember who the master is */
 225                                 unstrcpy(work->local_master_browser_name, comment);
 226                         }
 227                 }
 228                 return;
 229         }
 230
 231         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 232         if (!work) {
 233                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 234                          s->workgroup));
 235                 return;
 236         }
 237
 238         if ((servrec = find_server_in_workgroup( work, sname))) {
 239                 /* Check that this is not a locally known
 240                    server - if so ignore the entry. */
 241                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 242                         /* We already know about this server - update
 243                            the ttl. */
 244                         update_server_ttl(servrec, lp_max_ttl());
 245                         /* Update the type. */
 246                         servrec->serv.type = stype;
 247                 }
 248                 return;
 249         }
 250
 251         /* Create the server in the workgroup. */
 252         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 253 }
 254
 255 /**********************************************************************
 256  Read the completed sync info.
 257 **********************************************************************/
 258
 259 static void complete_sync(struct sync_record *s)
 260 {
 261         XFILE *f;
 262         char *server;
 263         char *type_str;
 264         unsigned type;
 265         char *comment;
 266         char line[1024];
 267         const char *ptr;
 268         int count=0;
 269
 270         f = x_fopen(s->fname,O_RDONLY, 0);
 271
 272         if (!f)
 273                 return;
 274
 275         while (!x_feof(f)) {
 276                 TALLOC_CTX *frame = NULL;
 277
 278                 if (!fgets_slash(line,sizeof(line),f))
 279                         continue;
 280
 281                 ptr = line;
 282
 283                 frame = talloc_stackframe();
 284                 if (!next_token_talloc(frame,&ptr,&server,NULL) ||
 285                     !next_token_talloc(frame,&ptr,&type_str,NULL) ||
 286                     !next_token_talloc(frame,&ptr,&comment,NULL)) {
 287                         TALLOC_FREE(frame);
 288                         continue;
 289                 }
 290
 291                 sscanf(type_str, "%X", &type);
 292
 293                 complete_one(s, server, type, comment);
 294
 295                 count++;
 296                 TALLOC_FREE(frame);
 297         }
 298         x_fclose(f);
 299
 300         unlink(s->fname);
 301
 302         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 303                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 304 }
 305
 306 /**********************************************************************
 307  Check for completion of any of the child processes.
 308 **********************************************************************/
 309
 310 void sync_check_completion(void)
 311 {
 312         struct sync_record *s, *next;
 313
 314         for (s=syncs;s;s=next) {
 315                 next = s->next;
 316                 if (!process_exists_by_pid(s->pid)) {
 317                         /* it has completed - grab the info */
 318                         complete_sync(s);
 319                         DLIST_REMOVE(syncs, s);
 320                         SAFE_FREE(s->fname);
 321                         SAFE_FREE(s);
 322                 }
 323         }
 324 }