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 "system/filesys.h"
  31 #include "../librpc/gen_ndr/svcctl.h"
  32 #include "nmbd/nmbd.h"
  33 #include "libsmb/clirap.h"
  34 #include "smbprofile.h"
  35
  36 struct sync_record {
  37         struct sync_record *next, *prev;
  38         unstring workgroup;
  39         unstring server;
  40         char *fname;
  41         struct in_addr ip;
  42         pid_t pid;
  43 };
  44
  45 /* a linked list of current sync connections */
  46 static struct sync_record *syncs;
  47
  48 static XFILE *fp;
  49
  50 /*******************************************************************
  51   This is the NetServerEnum callback.
  52   Note sname and comment are in UNIX codepage format.
  53   ******************************************************************/
  54
  55 static void callback(const char *sname, uint32 stype,
  56                      const char *comment, void *state)
  57 {
  58         x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  59 }
  60
  61 /*******************************************************************
  62   Synchronise browse lists with another browse server.
  63   Log in on the remote server's SMB port to their IPC$ service,
  64   do a NetServerEnum and record the results in fname
  65 ******************************************************************/
  66
  67 static void sync_child(char *name, int nm_type,
  68                        char *workgroup,
  69                        struct in_addr ip, bool local, bool servers,
  70                        char *fname)
  71 {
  72         fstring unix_workgroup;
  73         struct cli_state *cli;
  74         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  75         struct nmb_name called, calling;
  76         struct sockaddr_storage ss;
  77         NTSTATUS status;
  78
  79         /* W2K DMB's return empty browse lists on port 445. Use 139.
  80          * Patch from Andy Levine andyl@epicrealm.com.
  81          */
  82
  83         cli = cli_initialise();
  84         if (!cli) {
  85                 return;
  86         }
  87
  88         cli_set_port(cli, 139);
  89
  90         in_addr_to_sockaddr_storage(&ss, ip);
  91         status = cli_connect(cli, name, &ss);
  92         if (!NT_STATUS_IS_OK(status)) {
  93                 cli_shutdown(cli);
  94                 return;
  95         }
  96
  97         make_nmb_name(&calling, get_local_machine_name(), 0x0);
  98         make_nmb_name(&called , name, nm_type);
  99
 100         if (!cli_session_request(cli, &calling, &called)) {
 101                 cli_shutdown(cli);
 102                 return;
 103         }
 104
 105         status = cli_negprot(cli);
 106         if (!NT_STATUS_IS_OK(status)) {
 107                 cli_shutdown(cli);
 108                 return;
 109         }
 110
 111         if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0,
 112                                                workgroup))) {
 113                 cli_shutdown(cli);
 114                 return;
 115         }
 116
 117         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", "", 1))) {
 118                 cli_shutdown(cli);
 119                 return;
 120         }
 121
 122         /* All the cli_XX functions take UNIX character set. */
 123         fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
 124
 125         /* Fetch a workgroup list. */
 126         cli_NetServerEnum(cli, unix_workgroup,
 127                           local_type|SV_TYPE_DOMAIN_ENUM,
 128                           callback, NULL);
 129
 130         /* Now fetch a server list. */
 131         if (servers) {
 132                 fstrcpy(unix_workgroup, workgroup);
 133                 cli_NetServerEnum(cli, unix_workgroup,
 134                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 135                                   callback, NULL);
 136         }
 137
 138         cli_shutdown(cli);
 139 }
 140
 141 /*******************************************************************
 142   initialise a browse sync with another browse server.  Log in on the
 143   remote server's SMB port to their IPC$ service, do a NetServerEnum
 144   and record the results
 145 ******************************************************************/
 146
 147 void sync_browse_lists(struct work_record *work,
 148                        char *name, int nm_type,
 149                        struct in_addr ip, bool local, bool servers)
 150 {
 151         struct sync_record *s;
 152         static int counter;
 153
 154         START_PROFILE(sync_browse_lists);
 155         /* Check we're not trying to sync with ourselves. This can
 156            happen if we are a domain *and* a local master browser. */
 157         if (ismyip_v4(ip)) {
 158 done:
 159                 END_PROFILE(sync_browse_lists);
 160                 return;
 161         }
 162
 163         s = SMB_MALLOC_P(struct sync_record);
 164         if (!s) goto done;
 165
 166         ZERO_STRUCTP(s);
 167
 168         unstrcpy(s->workgroup, work->work_group);
 169         unstrcpy(s->server, name);
 170         s->ip = ip;
 171
 172         if (asprintf(&s->fname, "%s/sync.%d", lp_lockdir(), counter++) < 0) {
 173                 SAFE_FREE(s);
 174                 goto done;
 175         }
 176         /* Safe to use as 0 means no size change. */
 177         all_string_sub(s->fname,"//", "/", 0);
 178
 179         DLIST_ADD(syncs, s);
 180
 181         /* the parent forks and returns, leaving the child to do the
 182            actual sync and call END_PROFILE*/
 183         CatchChild();
 184         if ((s->pid = sys_fork())) return;
 185
 186         BlockSignals( False, SIGTERM );
 187
 188         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 189                  work->work_group, name, inet_ntoa(ip)));
 190
 191         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
 192         if (!fp) {
 193                 END_PROFILE(sync_browse_lists);
 194                 _exit(1);
 195         }
 196
 197         sync_child(name, nm_type, work->work_group, ip, local, servers,
 198                    s->fname);
 199
 200         x_fclose(fp);
 201         END_PROFILE(sync_browse_lists);
 202         _exit(0);
 203 }
 204
 205 /**********************************************************************
 206  Handle one line from a completed sync file.
 207  **********************************************************************/
 208
 209 static void complete_one(struct sync_record *s,
 210                          char *sname, uint32 stype, char *comment)
 211 {
 212         struct work_record *work;
 213         struct server_record *servrec;
 214
 215         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 216
 217         if (stype & SV_TYPE_DOMAIN_ENUM) {
 218                 /* See if we can find the workgroup on this subnet. */
 219                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 220                         /* We already know about this workgroup -
 221                            update the ttl. */
 222                         update_workgroup_ttl(work,lp_max_ttl());
 223                 } else {
 224                         /* Create the workgroup on the subnet. */
 225                         work = create_workgroup_on_subnet(unicast_subnet,
 226                                                           sname, lp_max_ttl());
 227                         if (work) {
 228                                 /* remember who the master is */
 229                                 unstrcpy(work->local_master_browser_name, comment);
 230                         }
 231                 }
 232                 return;
 233         }
 234
 235         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 236         if (!work) {
 237                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 238                          s->workgroup));
 239                 return;
 240         }
 241
 242         if ((servrec = find_server_in_workgroup( work, sname))) {
 243                 /* Check that this is not a locally known
 244                    server - if so ignore the entry. */
 245                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 246                         /* We already know about this server - update
 247                            the ttl. */
 248                         update_server_ttl(servrec, lp_max_ttl());
 249                         /* Update the type. */
 250                         servrec->serv.type = stype;
 251                 }
 252                 return;
 253         }
 254
 255         /* Create the server in the workgroup. */
 256         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 257 }
 258
 259 /**********************************************************************
 260  Read the completed sync info.
 261 **********************************************************************/
 262
 263 static void complete_sync(struct sync_record *s)
 264 {
 265         XFILE *f;
 266         char *server;
 267         char *type_str;
 268         unsigned type;
 269         char *comment;
 270         char line[1024];
 271         const char *ptr;
 272         int count=0;
 273
 274         f = x_fopen(s->fname,O_RDONLY, 0);
 275
 276         if (!f)
 277                 return;
 278
 279         while (!x_feof(f)) {
 280                 TALLOC_CTX *frame = NULL;
 281
 282                 if (!fgets_slash(line,sizeof(line),f))
 283                         continue;
 284
 285                 ptr = line;
 286
 287                 frame = talloc_stackframe();
 288                 if (!next_token_talloc(frame,&ptr,&server,NULL) ||
 289                     !next_token_talloc(frame,&ptr,&type_str,NULL) ||
 290                     !next_token_talloc(frame,&ptr,&comment,NULL)) {
 291                         TALLOC_FREE(frame);
 292                         continue;
 293                 }
 294
 295                 sscanf(type_str, "%X", &type);
 296
 297                 complete_one(s, server, type, comment);
 298
 299                 count++;
 300                 TALLOC_FREE(frame);
 301         }
 302         x_fclose(f);
 303
 304         unlink(s->fname);
 305
 306         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 307                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 308 }
 309
 310 /**********************************************************************
 311  Check for completion of any of the child processes.
 312 **********************************************************************/
 313
 314 void sync_check_completion(void)
 315 {
 316         struct sync_record *s, *next;
 317
 318         for (s=syncs;s;s=next) {
 319                 next = s->next;
 320                 if (!process_exists_by_pid(s->pid)) {
 321                         /* it has completed - grab the info */
 322                         complete_sync(s);
 323                         DLIST_REMOVE(syncs, s);
 324                         SAFE_FREE(s->fname);
 325                         SAFE_FREE(s);
 326                 }
 327         }
 328 }