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/libsmb.h"
  34 #include "libsmb/clirap.h"
  35 #include "smbprofile.h"
  36
  37 struct sync_record {
  38         struct sync_record *next, *prev;
  39         unstring workgroup;
  40         unstring server;
  41         char *fname;
  42         struct in_addr ip;
  43         pid_t pid;
  44 };
  45
  46 /* a linked list of current sync connections */
  47 static struct sync_record *syncs;
  48
  49 static XFILE *fp;
  50
  51 /*******************************************************************
  52   This is the NetServerEnum callback.
  53   Note sname and comment are in UNIX codepage format.
  54   ******************************************************************/
  55
  56 static void callback(const char *sname, uint32 stype,
  57                      const char *comment, void *state)
  58 {
  59         x_fprintf(fp,"\"%s\" %08X \"%s\"\n", sname, stype, comment);
  60 }
  61
  62 /*******************************************************************
  63   Synchronise browse lists with another browse server.
  64   Log in on the remote server's SMB port to their IPC$ service,
  65   do a NetServerEnum and record the results in fname
  66 ******************************************************************/
  67
  68 static void sync_child(char *name, int nm_type,
  69                        char *workgroup,
  70                        struct in_addr ip, bool local, bool servers,
  71                        char *fname)
  72 {
  73         fstring unix_workgroup;
  74         struct cli_state *cli;
  75         uint32 local_type = local ? SV_TYPE_LOCAL_LIST_ONLY : 0;
  76         struct nmb_name called, calling;
  77         struct sockaddr_storage ss;
  78         NTSTATUS status;
  79
  80         /* W2K DMB's return empty browse lists on port 445. Use 139.
  81          * Patch from Andy Levine andyl@epicrealm.com.
  82          */
  83
  84         cli = cli_initialise();
  85         if (!cli) {
  86                 return;
  87         }
  88
  89         cli_set_port(cli, 139);
  90
  91         in_addr_to_sockaddr_storage(&ss, ip);
  92         status = cli_connect(cli, name, &ss);
  93         if (!NT_STATUS_IS_OK(status)) {
  94                 cli_shutdown(cli);
  95                 return;
  96         }
  97
  98         make_nmb_name(&calling, get_local_machine_name(), 0x0);
  99         make_nmb_name(&called , name, nm_type);
 100
 101         if (!cli_session_request(cli, &calling, &called)) {
 102                 cli_shutdown(cli);
 103                 return;
 104         }
 105
 106         status = cli_negprot(cli);
 107         if (!NT_STATUS_IS_OK(status)) {
 108                 cli_shutdown(cli);
 109                 return;
 110         }
 111
 112         if (!NT_STATUS_IS_OK(cli_session_setup(cli, "", "", 1, "", 0,
 113                                                workgroup))) {
 114                 cli_shutdown(cli);
 115                 return;
 116         }
 117
 118         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", "", 1))) {
 119                 cli_shutdown(cli);
 120                 return;
 121         }
 122
 123         /* All the cli_XX functions take UNIX character set. */
 124         fstrcpy(unix_workgroup, cli->server_domain ? cli->server_domain : workgroup);
 125
 126         /* Fetch a workgroup list. */
 127         cli_NetServerEnum(cli, unix_workgroup,
 128                           local_type|SV_TYPE_DOMAIN_ENUM,
 129                           callback, NULL);
 130
 131         /* Now fetch a server list. */
 132         if (servers) {
 133                 fstrcpy(unix_workgroup, workgroup);
 134                 cli_NetServerEnum(cli, unix_workgroup,
 135                                   local?SV_TYPE_LOCAL_LIST_ONLY:SV_TYPE_ALL,
 136                                   callback, NULL);
 137         }
 138
 139         cli_shutdown(cli);
 140 }
 141
 142 /*******************************************************************
 143   initialise a browse sync with another browse server.  Log in on the
 144   remote server's SMB port to their IPC$ service, do a NetServerEnum
 145   and record the results
 146 ******************************************************************/
 147
 148 void sync_browse_lists(struct work_record *work,
 149                        char *name, int nm_type,
 150                        struct in_addr ip, bool local, bool servers)
 151 {
 152         struct sync_record *s;
 153         static int counter;
 154
 155         START_PROFILE(sync_browse_lists);
 156         /* Check we're not trying to sync with ourselves. This can
 157            happen if we are a domain *and* a local master browser. */
 158         if (ismyip_v4(ip)) {
 159 done:
 160                 END_PROFILE(sync_browse_lists);
 161                 return;
 162         }
 163
 164         s = SMB_MALLOC_P(struct sync_record);
 165         if (!s) goto done;
 166
 167         ZERO_STRUCTP(s);
 168
 169         unstrcpy(s->workgroup, work->work_group);
 170         unstrcpy(s->server, name);
 171         s->ip = ip;
 172
 173         if (asprintf(&s->fname, "%s/sync.%d", lp_lockdir(), counter++) < 0) {
 174                 SAFE_FREE(s);
 175                 goto done;
 176         }
 177         /* Safe to use as 0 means no size change. */
 178         all_string_sub(s->fname,"//", "/", 0);
 179
 180         DLIST_ADD(syncs, s);
 181
 182         /* the parent forks and returns, leaving the child to do the
 183            actual sync and call END_PROFILE*/
 184         CatchChild();
 185         if ((s->pid = sys_fork())) return;
 186
 187         BlockSignals( False, SIGTERM );
 188
 189         DEBUG(2,("Initiating browse sync for %s to %s(%s)\n",
 190                  work->work_group, name, inet_ntoa(ip)));
 191
 192         fp = x_fopen(s->fname,O_WRONLY|O_CREAT|O_TRUNC, 0644);
 193         if (!fp) {
 194                 END_PROFILE(sync_browse_lists);
 195                 _exit(1);
 196         }
 197
 198         sync_child(name, nm_type, work->work_group, ip, local, servers,
 199                    s->fname);
 200
 201         x_fclose(fp);
 202         END_PROFILE(sync_browse_lists);
 203         _exit(0);
 204 }
 205
 206 /**********************************************************************
 207  Handle one line from a completed sync file.
 208  **********************************************************************/
 209
 210 static void complete_one(struct sync_record *s,
 211                          char *sname, uint32 stype, char *comment)
 212 {
 213         struct work_record *work;
 214         struct server_record *servrec;
 215
 216         stype &= ~SV_TYPE_LOCAL_LIST_ONLY;
 217
 218         if (stype & SV_TYPE_DOMAIN_ENUM) {
 219                 /* See if we can find the workgroup on this subnet. */
 220                 if((work=find_workgroup_on_subnet(unicast_subnet, sname))) {
 221                         /* We already know about this workgroup -
 222                            update the ttl. */
 223                         update_workgroup_ttl(work,lp_max_ttl());
 224                 } else {
 225                         /* Create the workgroup on the subnet. */
 226                         work = create_workgroup_on_subnet(unicast_subnet,
 227                                                           sname, lp_max_ttl());
 228                         if (work) {
 229                                 /* remember who the master is */
 230                                 unstrcpy(work->local_master_browser_name, comment);
 231                         }
 232                 }
 233                 return;
 234         }
 235
 236         work = find_workgroup_on_subnet(unicast_subnet, s->workgroup);
 237         if (!work) {
 238                 DEBUG(3,("workgroup %s doesn't exist on unicast subnet?\n",
 239                          s->workgroup));
 240                 return;
 241         }
 242
 243         if ((servrec = find_server_in_workgroup( work, sname))) {
 244                 /* Check that this is not a locally known
 245                    server - if so ignore the entry. */
 246                 if(!(servrec->serv.type & SV_TYPE_LOCAL_LIST_ONLY)) {
 247                         /* We already know about this server - update
 248                            the ttl. */
 249                         update_server_ttl(servrec, lp_max_ttl());
 250                         /* Update the type. */
 251                         servrec->serv.type = stype;
 252                 }
 253                 return;
 254         }
 255
 256         /* Create the server in the workgroup. */
 257         create_server_on_workgroup(work, sname,stype, lp_max_ttl(), comment);
 258 }
 259
 260 /**********************************************************************
 261  Read the completed sync info.
 262 **********************************************************************/
 263
 264 static void complete_sync(struct sync_record *s)
 265 {
 266         XFILE *f;
 267         char *server;
 268         char *type_str;
 269         unsigned type;
 270         char *comment;
 271         char line[1024];
 272         const char *ptr;
 273         int count=0;
 274
 275         f = x_fopen(s->fname,O_RDONLY, 0);
 276
 277         if (!f)
 278                 return;
 279
 280         while (!x_feof(f)) {
 281                 TALLOC_CTX *frame = NULL;
 282
 283                 if (!fgets_slash(line,sizeof(line),f))
 284                         continue;
 285
 286                 ptr = line;
 287
 288                 frame = talloc_stackframe();
 289                 if (!next_token_talloc(frame,&ptr,&server,NULL) ||
 290                     !next_token_talloc(frame,&ptr,&type_str,NULL) ||
 291                     !next_token_talloc(frame,&ptr,&comment,NULL)) {
 292                         TALLOC_FREE(frame);
 293                         continue;
 294                 }
 295
 296                 sscanf(type_str, "%X", &type);
 297
 298                 complete_one(s, server, type, comment);
 299
 300                 count++;
 301                 TALLOC_FREE(frame);
 302         }
 303         x_fclose(f);
 304
 305         unlink(s->fname);
 306
 307         DEBUG(2,("sync with %s(%s) for workgroup %s completed (%d records)\n",
 308                  s->server, inet_ntoa(s->ip), s->workgroup, count));
 309 }
 310
 311 /**********************************************************************
 312  Check for completion of any of the child processes.
 313 **********************************************************************/
 314
 315 void sync_check_completion(void)
 316 {
 317         struct sync_record *s, *next;
 318
 319         for (s=syncs;s;s=next) {
 320                 next = s->next;
 321                 if (!process_exists_by_pid(s->pid)) {
 322                         /* it has completed - grab the info */
 323                         complete_sync(s);
 324                         DLIST_REMOVE(syncs, s);
 325                         SAFE_FREE(s->fname);
 326                         SAFE_FREE(s);
 327                 }
 328         }
 329 }